Sanitation truck classification and operation precautions

With the improvement of modern urbanized living standards, the pace of people’s lives is getting faster and faster, and the population is becoming denser. There are buildings covered with reinforced concrete everywhere, exhausted trucks and roads everywhere. The smog and smoke in cities, the large amount of exhaust emissions from automobiles and various pollutants emitted by factories, etc. have all seriously affected people’s air quality and quality of life. Therefore, the contribution of the sanitation truck series to the sanitation industry is of great importance.

Various types of garbage trucks are required for daily life garbage disposal, and sewage sewage and sludge are required to be used for sewage disposal to the sewer. The green plants and lawn green belts on both sides of the road, the daily maintenance and cleaning of the road requires the use of sprinklers, and the large amount of dust on the road requires the use of road sweepers and vacuum cleaners. The environmental sanitation series of sprinklers, manure suction trucks, sewage suction trucks, hook garbage trucks, compression garbage trucks, road sweepers and vacuum cleaners, etc. can make a significant contribution to the sanitation business of our city.

Sanitation sprinklers can also be divided according to capacity, and can be divided into how many square meters or how many tons of sprinklers. This can be determined according to the use area of ​​each place.

Water tank truck

Sanitation greening sprinklers can also be classified according to use: divided into spraying, flushing, spraying and flushing sprinklers; sanitation sprinklers are classified by chassis: can be divided into automotive, semi-trailer and trailer type sprinklers.

Sanitation truck operation precautions.

(1) Maintain the appropriate number of revolutions of the vacuum pump. The speed of the vacuum pump is too high, and the rotor heats up. The speed is too low, which will cause additional shocks to the shipping machine and components, affecting the life. In order to achieve a suitable working speed, please adjust the hand throttle position according to the pump type in advance.

(2) Dumping and dumping the tank on flat ground; dumping and dumping the tank on inclined roads will cause distortion and failure of various components, and may cause rollover accidents.

(3) When the tank is unloaded, open the tank first and then the tank door: Before the dump is unloaded, loosen the locking bolts before lifting the rear tank door to the required angle. When the tank is fully loaded, it is forbidden to rear Lift the tank with the tank door closed, otherwise there is danger of overturning.

(4) The engine is idling when the oil pump and vacuum pump are taking power, and fully step on the clutch pedal. Slowly release the clutch pedal after turning on the power take-off switch.

(5) When the car is running, the vacuum pump and oil pump are stopped.

CIMC-Sanitation-truck2

(6) There must be no inhalation and transportation of waste oil and dangerous materials by this vehicle.

(7) When entering the bottom of the tank or overhauling with the dump tank lifted, a support rod and safety stop must be used.

(8) When transporting dirt, the vehicle must be driven at medium and slow speeds, and no sharp turns or sharp brakes are allowed, because the center of gravity of the wave barrier is not high in the tank.

Compressed garbage truck troubleshooting method:

CIMC Sanitation truck

First, when it is found that the pressure generated by the compression mechanism is insufficient, we should first consider whether the power to support the pressure is insufficient-fuel, if the fuel in the fuel tank is insufficient, it should be added in time. If you find that the use of oil is inversely proportional to the operation of the garbage truck, you should consider whether there is oil leakage and check the system for oil leakage in time.

Secondly, if there is sufficient oil from the fuel tank, but the pressure generated by the compression mechanism is still insufficient, we should next check whether the suction pipe in the compression mechanism is defective, check whether it is blocked or damaged, and then clean the suction pipe Replace with new suction pipe.

Finally, when the above points are not a problem, but the pressure is still not enough, we should check whether the ball valve is opened. If the ball valve is not opened, the pressure generated by the compression mechanism is also insufficient. The ball valve should be opened. Finally, check whether the pressure of the compression system reaches the pressure of the vehicle operation before use.

Water tank truck structure and classification

Water tank trucks are special vehicles that are used to transport water. Tank vehicles are widely used in sanitation, oil transportation, and chemical product transportation.

Water tank trucks are divided into automobile type, semi-trailer type and trailer type sprinkler according to the chassis; how many square meters or tons of sprinklers can be divided according to the capacity; according to the different chassis, it can be divided into Dongfeng, Jiefang, Futian, Jianghuai, etc .

Optional Water Tank Truck

Water-tank-truck

The prices of water tank trucks produced by various production plants in different regions are different.

Standard configuration (greening spray truck, water tanker truck): front flush, rear spray, side spray; high side shower; rear working platform with green sprinkler, can be adjusted into a column shape with a range of ≥28m; it can also be adjusted into a mist shape, The range is ≥15m. Optional medicine plate, fight drugs machine. It can also be equipped with advanced facilities such as medicine trays, medicine tray pumps, anti-corrosion and anti-rust inside the tank, multi-directional water inlet and outlet joints, solenoid valves, and pneumatic valves to meet the needs of different users.

1. Water tank truck tank production, using automatic assembly line tank production process is divided into: cutting, automatic welding of the panel, head spinning and forming, one-time roll forming of the tank and other domestic advanced production processes. Tank materials are mostly produced using high-quality carbon steel plates. For special applications, 304 stainless steel can also be used according to customer needs. Tank volume is “4 cubic, 5 cubic, 6 cubic, 8 cubic, 10 cubic, 13 cubic, 15 cubic” and so on. The piping system consists of pipes, four-position three-way ball valves, straight-through ball valves, filters, water outlets, front flush, side spray, and high side showers.

2. The working platform behind the water tanker is composed of green sprinkler anti-aircraft guns. The operating system is mainly driven by the engine. The power take-off installed on the gearbox drives the sprinkler pump. The sprinkler pump generates power and sprays the liquid inside the tank through the pipe network. Working range: self-priming height: ≥7m, watering width: ≥14m, maximum range: ≥28m; can be adjusted into a column shape, the range is ≥28m; it can also be adjusted into a mist shape, the range is ≥5m. Sprinkler pump, equipped with sprinkler, green sprayer, high-power special sprinkler pump (weilong pump), with fire connector, with self-flow valve, with self-priming function.

3. Water tank trucks can be equipped with optional equipment: it can be equipped with advanced facilities such as medicine trays, pumps, anti-corrosion and anti-rust inside the tank, multi-directional water inlet and outlet joints, solenoid valves, and pneumatic valves to meet the needs of different users. Cab, sprinkler cab is divided into: pointed cab, or flat-head cab, also known as long-head cab, short-head cab. Power take-off, the general sprinkler uses Dongfeng, Jiefang series power take-off, pneumatic operation, the operation switch is pulled backward, the power take-off tooth enters the bite position, the water pump is driven by the drive shaft, the switch returns to the position, the water pump stops working.

What are the functions of the fuel tank truck clutch?

According to people’s usual driving habits, when driving a tank truck vehicle, as the clutch pedal is raised, the accelerator pedal must be properly depressed, so as to ensure a smooth start without “trembling”. Use the method of starting at idle speed. Just for experimental purposes. So what are the functions of the clutch of the tanker truck?

1.Ensure smooth start of fuel tank truck

This is the primary function of the tanker clutch. Before the car starts, it is natural to start the engine. When the car starts, the car gradually accelerates from a completely stationary state. If the drive train (which links the entire car) is rigidly connected to the engine, the car will suddenly move forward as soon as the transmission is in gear, but it will not start. This is because the car has a large inertia from stationary to forward, causing a great resistance to the engine. Under this moment of inertia resistance, the engine’s speed drops sharply below the minimum stable speed (generally 300-500 RPM) in an instant, and the engine will stop working and the car will not start.

Oil tank truck

Therefore, we need the help of the clutch. After the engine starts and before the car starts, the driver first depresses the clutch pedal, disengages the clutch, disengages the engine from the drive train, puts the transmission in gear, and then gradually releases the clutch pedal to gradually engage the clutch. During the engagement process, the engine’s blocked torque gradually increases, so you should gradually press the accelerator pedal at the same time, that is, gradually increase the fuel supply to the engine, so that the engine speed is always maintained at the minimum stable speed without stopping. At the same time, as the clutch’s engagement tightness gradually increases, the torque transmitted by the engine to the driving wheels via the drive train gradually increases. When the traction is sufficient to overcome the starting resistance, the car starts to move from standstill and gradually accelerates.

2. Smooth shifting of fuel tank truck

In the process of driving a car, in order to adapt to changing driving conditions, the drive train often needs to change to different gears. To realize gear shifting of a gear type transmission, generally, a gear or other gear-shifting mechanism is shifted to push out a certain gear pair of the original gear position for transmission, and then bring the gear pair of the other gear position into operation. Before changing gears, you must depress the clutch pedal to interrupt the power transmission, so that the meshing pair of the original gear can be disengaged. At the same time, the speed of the meshing position of the meshing pair of the new gear can be gradually synchronized, so that the impact when entering the mesh can be greatly Reduced to achieve smooth shifting.

Septic tank truck

3. Prevent overload of fuel tank truck drive train

When the car is in emergency braking, if there is no clutch, the engine will reduce the speed sharply due to the rigid connection with the drive train, so all moving parts in it will generate a large inertial force (its value may greatly exceed that of the engine during normal operation). Maximum torque), causing the drive train to exceed its load carrying capacity and cause damage to the machine. With a clutch, this danger can be eliminated by relying on the relative movement that can occur between the driving and driven parts of the clutch. Therefore, we need a clutch to limit the maximum torque experienced by the drive train and ensure safety.

Fuel tank truck clutches can be divided into: friction clutches, or using fluid as the transmission medium (ie hydraulic coupling), or using force transmission (ie electromagnetic clutch).

What are the reasons for the slippage of the oil tank truck clutch?

The clutch on the oil tank truck is in a tightly engaged state during normal driving, and the clutch should not slip. When driving, except when the car starts, shifts and low-speed brakes need to step on the clutch pedal, do not step on all other times. Clutch, or put your feet on the clutch pedal. Keeping your feet on the clutch pedal for a long time while driving a tanker can easily cause the clutch to slip.

In view of the failure of the clutch of the oil tank truck, the main reasons for the personnel of the oil tank truck manufacturer are mainly divided into three categories, that is, the cause of the cover assembly, the foreign matter is caught between the cover and the diaphragm spring, and the cover assembly matches the driven disk assembly s reason.

CIMC Cement Bulk Carrier

Reason for cover assembly

The working pressure of the cover assembly is insufficient, the normal mileage has not reached the required mileage, the cover assembly pressure is attenuated excessively, and the improper operations such as overloading and trapping multiple consecutive starts cause overheating or deformation of the pressure plate, and the working surface of the pressure plate is contaminated Oily.

(1) The oil on the working surface of the platen has not been cleaned carefully before loading;

(2) Oil leakage from the oil seal behind the crankshaft of the engine or one shaft of the gearbox;

(3) Excessive grease has been applied to the shaft spline or bearing sleeve.

Oil-tank-truck

Foreign object caught between cover and diaphragm spring

(1) After the broken bearing is abnormally damaged, the bearing steel ball and the like fall between the cover and the diaphragm spring, causing slippage, shaking, or poor separation;

(2) The foreign matter in the casing is not cleaned before installation, and it enters between the cover and the diaphragm spring, causing slippage, shaking, or poor separation;

(3) Improper operation caused the clutch to burn out, so that the friction plate of the driven disc assembly fell off and entered between the cover and the diaphragm.

Fuel-tank-truck

Reasons why the cover assembly matches the driven disc assembly

(1) Mismatch caused by the use of driven disk assemblies from other manufacturers;

(2) Mismatch caused by cover assembly or driven plate assembly with inappropriate specifications (combined parameters);

(3) The control system is not completely reset, causing the clutch to be in a semi-disengaged state and causing slippage.

Description of mixer truck structure and maintenance measures

The mixing truck is composed of a vehicle chassis and a special device for concrete mixer trucks. The chassis of mixer trucks on the market mostly adopts the second-class general chassis provided by the vehicle manufacturers. Its special mechanism mainly includes the structure of the mixing drum, the loading frame, the feeding, discharging, operation and hydraulic systems. The power of the chassis of the car is taken out through a power take-off device, and the variable pump of the hydraulic system is driven, and the mechanical energy is converted into hydraulic energy to be transmitted to a fixed amount of motor. Let’s take a closer look at the structure of the mixer truck and the corresponding maintenance measures.

Mixer truck structure

CIMC Sanitation truck

1.Stirring cylinder structure

The mixing tube is the core of the entire upper part.It has high technical content, small tolerance range, high precision requirements, and residual performance.It also directly affects the quality of the premixed mixer.If the design is not properly manufactured, the blade is double-log The spiral line is the theoretical basis. After actual testing and simulation correction, the current blades with fast feeding and discharging performance, low residual rate and ensuring the quality of ready-mixed concrete are formed. The stirring blade can prevent and help improve the discharge performance of the concrete. There are holes in the blade at the front of the outlet, which can reduce the adhesion of the concrete to the blade and improve the uniformity of the discharge. The sliding angle of the bottom of the mixing cylinder is continuously increased to ensure that the blades fully stir the concrete and reduce the residual rate.The production of the mixing cylinder is made of integrated external card and internal support. The requirement of the coaxiality of the reducer axis and the raceway axis is guaranteed. Make the whole vehicle run smoothly and comfortably, and the load impact force is small. The material of the mixing tube is a wear-resistant high-strength steel plate. After the shape of the mixing tube is formed, the inner support is removed and the blades are welded. The blade material is made of high wear-resistant 16Mn steel material, the wear resistance of the blade is increased by 15%, the double logarithmic variable pitch design, the mixing quality and the discharge speed are perfectly balanced. The welding process uses carbon oxide shielded welding. After the mixing cylinder is manufactured, it is shot peened to eliminate the stress generated during welding and manufacturing, and also increase the adhesion of the paint. After the final pre-installation of the upper body part, the whole process of shot blasting, rust removal, sanding, painting and baking is performed.

2.Uploading frame system

The frame system is divided into front seat, rear seat and auxiliary frame. The beam type of the upper sub-frame is front and rear through-holes. It adopts a fully-enclosed rectangular tube structure or a steel plate pressed into a groove shape. All materials are made of 16Mn steel. The chassis has the advantages of high strength, small deformation, and good stability.

3.Feeding system

The maximum size of the most hopper is 1075 × 1075, the single side is flat, and the remaining three sides are curved funnel shapes. It is locally strengthened in places where it is easy to wear. Because of its large internal space, it is easy to remove the residue at the inlet of the mixing drum, and its design angle is reasonable, so that the feeding speed is accelerated, and the phenomenon of blocking and jamming is not easy to occur.

4.Discharging system

The discharge chute can rotate 180 ° in the horizontal direction, and there is a limit device every 20 °. The compression spring type is used in the vertical direction, which can be lifted and lowered freely, so as to meet the requirements of different working conditions. The whole chute is divided into two parts, the main chute and the auxiliary chute. The most susceptible parts on the main chute are locally strengthened. The optimized design of the discharge chute is conducive to improving the flow performance of the concrete and the discharge speed. The discharging chute is provided with a locking device, which is fixed and locked during the running of the vehicle to ensure safe and reliable driving.

5.Control system

The operating system adopts a rod control system with accurate positioning and reliable control. The control points are divided into three parts: the cab and the two sides of the rear of the car. The operating lever in the cab can also control the steering of the mixer drum to ensure that the mixer drum is in an agitated state during vehicle driving. The entire control system has a compact structure, flexible operation and reliable control.

6.Hydraulic system

The hydraulic driving method uses a manual servo variable axial piston pump, a fixed piston motor and a reducer to form a closed hydraulic transmission system, which can be stepless forward and reverse speed change, and it is easy to adjust and control. The large-capacity oil tank set in the hydraulic circuit not only plays a role of storing oil but also radiating heat, so as to ensure normal work at an ambient temperature of -20-50 °. The reducer is directly connected to the bottom of the mixer.The output shaft connected to the reducer can be deflected within ± 6 °, which can compensate the displacement of the axis of the mixer, and ensure that the drive of the mixer is not distorted during the driving process of the car. Impact.

7. Water supply system

The water supply system adopts gas-type water supply. The compressed gas passes from the main tank of the main vehicle through a single-circuit protection valve, air source switch, pressure reducing valve, and one-way valve to the pressure water tank. The water in the water tank is pressed into the water pipe. The pressure reducing valve can be adjusted freely in the range of 00.3Mpa. The water tank has a capacity of 350 liters and is equipped with a hose and a flushing device for easy flushing.

CIMC Concrete Mixer Truck

Mixer truck maintenance

The proper use and maintenance of the mixer truck directly affects the life of the vehicle and the rate of mechanical integrity. How to maintain and maintain the several assembly systems of the mixer truck.

First, the mixer

When the engine reaches the maximum speed, the speed of the mixing drum should not exceed 15 revolutions per minute, otherwise, the wall of the mixing drum and the stirring blades will wear prematurely after being filled with materials; during the operation, the operating system is used to adjust the speed of the mixing drum. When waiting for unloading, the rotation speed of the mixing drum must be adjusted to not less than 10 revolutions per minute, otherwise the quality of the mixture will be affected; there is a round nut on the roller supporting the mixing drum to set and adjust the bearing clearance. The spiral blades in the mixing drum are severely worn. They should be inspected once a year and preventive repairs should be performed every two years.

There should be no leakage of slurry between the concrete inlet and the mixing drum. Generally, the gap between the inlet and the mixing drum is not more than 5mm. If the slurry leaks, it should be repaired according to different models, some of which are replaced with wide rubber bands and some are welded with thin steel plates, the size is larger than a half circle.

Second, the hydraulic system

The working pressure of the hydraulic pump and hydraulic motor of the mixing drum is 40 ~ 45Mpa. The pressure of the hydraulic system should conform to the requirements in the operating instructions of the hydraulic parts. It should not be adjusted at will. The oil quality and quantity of hydraulic oil should meet the original requirements.

During the oil change, the first oil change time is performed after 500 hours of pick-up work, and the second and subsequent oil change intervals should be about one year; it is worth noting: each oil change must be run only when the operating temperature is reached. After replacement, the sealing performance of the entire system must be checked after each oil change, and all bolts, drain plugs and hose connections must be re-tightened. It should also be noted here that when removing any part of the hydraulic system, the interface should be sealed immediately. To prevent dust from entering.

Third, the water supply system

When there is danger of icing during winter operation, the water supply system components must be drained, as long as all the control valves are opened to drain the water, and they are tightened one by one when refilling the water. Before the vehicle runs, close the intake control valve of the water supply system to avoid affecting the braking performance of the vehicle.

The above is all about the mixer truck. Only by knowing the structure and maintenance of the mixer truck in detail can you drive safely and extend its service life to a certain extent.

How to properly operate a concrete mixer truck

The concrete mixer truck is a kind of machine with blades that rotates in the tank or cylinder to stir and mix various raw materials to become a mixture or a machine with suitable consistency. Because the operation of the mixer is slightly different from other equipment, not everyone will operate the condensate mixer truck. If you do not understand the operation process, blind operation may cause serious consequences. Therefore, when operating the concrete mixer truck, we must follow the daily use operations and standard driving, so that we can better use the mixer truck.

CIMC Concrete Mixer Truck

Correct operation method of concrete mixer truck

(1) Check the fuel, lubricating oil, hydraulic oil, brake fluid, cooling water, etc. before concrete mixing and transportation, and ensure that the quality is sufficient.

(2) Check the power output device and confirm that there are no loose bolts or oil leakage from the bearings.

(3) When mixing and transporting, the load of concrete shall not exceed the rated capacity.

(4) Before starting the mixer, put the operation handle of the mixer in the “stop” position. After starting the engine, the mixer should be rotated at low speed for about 10 minutes, and the hydraulic oil temperature should be raised above 20 ℃ before working.

(5) Before loading the mixing and conveying truck, the mixing drum should be reversed to drain the water and debris in the drum to ensure the quality of the concrete.

(6) When loading, the joystick should be placed in the “loading” position, and the rotation speed of the mixing drum should be adjusted to make the feeding smooth.

(7) When transporting concrete, ensure that the slide is placed firmly to prevent it from swinging due to looseness, hurting pedestrians during travel, or affecting the normal operation of other vehicles.

CIMC Concrete Mixer Truck

(8) When the mixed concrete is shipped, the rotation speed of the mixing drum is 2-10 rpm. During the transportation, the segregation of the mixer is prevented to ensure the quality. When driving on a road with a slope of more than 15 degrees, or a road that shakes from side to side, stop stirring and rotating. After the road condition improves, resume stirring and rotating.

(9) The concrete tank truck cannot transport concrete for longer than the time specified by the mixing station. During the transportation of concrete, the mixing drum must not stop for a long time to prevent the concrete from segregating and solidifying. The driver should always observe the concrete situation and report the abnormality to the dispatching room in time to apply for processing.

(10) When the mixing drum changes from positive to reverse, the control handle should be placed in the middle position first, and after the mixing drum stops, then the control lever handle should be put to the reverse position.

(11) Before discharging the concrete, the mixing drum should be stirred for 1 minute at a speed of 10-12 rpm, and then discharged.

(12) The continuous running time of the stirring device should not exceed 8h.

(13) After the work is completed, the inside of the mixing drum and the body should be cleaned, and the remaining concrete should not be left in the drum.

(14) The water level of the water tank should be kept normal. When parking in winter, drain off the water in the water tank and water supply system.

Vehicle operation precautions

Concrete mixer truck

When driving

(1) The vehicle must start in first gear when the vehicle is heavily loaded, and avoid sharp turns at high speed.

(2) Avoid full throttle starting and emergency braking. Full throttle starting will cause clutch damage or uneven tire wear, and emergency braking will accelerate tire and brake friction plate wear.

(3) Rotate the discharge tank to an angle perpendicular to the mixing drum and fasten it with a locking mechanism. If there is an auxiliary discharge tank on the car, it will be fixed firmly to prevent accidents.

(4) The operating handle at the rear of the vehicle should be located at the “stirring” position.

During vehicle operation

(1) When the mixer truck arrives at the construction site, the parking pavement should be flat before unloading, so as to avoid safety accidents caused by the inclined road.

(2) During the loading and unloading process, it is strictly prohibited to bombard the throttle.

(3) When approaching the material inlet of the pump truck, you must obey the instructions of the site and the pumpman.

During cleaning and maintenance

(1) After the discharge at the construction site is completed, the hoses provided with the mixer truck should be used to flush the hopper, discharge hopper, discharge tank, etc. If there are special waste discharge points at the construction site, they should be discharged immediately. Return to the company and discharge the waste in the gravel separator.

(2) When removing and flushing the concrete at the mouth of the mixing drum, the feeding and discharging device, the supporting wheel, etc., the control lever must be placed in the stop position.

(3) At the end of each day, the driver should be responsible for pouring clean water into the mixing drum and rotating it at high speed (14 to 18 rpm) for 3 to 5 minutes, and then discharge the water into the sand and gravel separator to ensure that the drum is clean and clean. Prevent buildup.

What are the precautions for using the 16 cubic mixer truck

Mixing trucks are mainly used in construction sites for concrete production. I believe everyone should be familiar with it. In the process of driving the vehicle, drive the stirring equipment to move the material to stir it. In simple terms, a mixer truck is a device that installs mixing equipment on a transport vehicle to achieve a movable effect. It is understood that there are many types of mixer trucks on the market, of which 16-square mixer trucks are more popular.

In fact, the simple understanding of the 16-square mixer truck is that this type of mixer truck can produce and transport the 16-square concrete at one time. It is relatively large, but it requires a lot of attention when using it. , So as to ensure better results.

Follow the instructions

It should be known that the 16-square mixer truck realizes the mixing of cement and stones by the pressure of the hydraulic system, which has certain regularity. For this reason, when using the mixer truck, it must be operated in accordance with the instructions, and can not be changed and adjusted at will, so that no errors will occur. Especially when it is necessary to add some other substances, it is necessary to operate in a specific way and cannot be changed randomly.

Oil tank truck

Winter operation

In winter, the temperature is relatively low and icing may occur. For this reason, be sure to check the equipment for ice before construction in winter. Once the direction freezes, you need to use hot water or other ways to defrost before you can use it. If the equipment freezes, it is easy to rub it during its operation, which directly damages the mechanical equipment.

CIMC Cement Bulk Carrier

After construction discharge

After the unloading of the construction, the various equipment must be cleaned in time, especially the positions of the feed hopper, discharge hopper, discharge chute and so on. Can be carried out by means of water pipe scouring, because some materials will have a certain degree of adhesion, if it is cleaned in time, it is easy for dirt to accumulate and affect the service life of the mixer.

There are probably a few things that need to be noticed during the use of the 16-square mixer truck. In fact, whether it needs to be performed in accordance with the instructions during operation, or a comprehensive inspection of the vehicle before operation in winter to ensure the safety of use. Or after the construction is unloaded, the cleaning of each equipment needs to be paid attention to by everyone.

What need to pay attention to when replacing tank truck tires

The service life of tank truck tires is generally 4 years or 60,000-80,000 kilometers. Whether to change it is to see if the wear limit is not reached, and the second is to watch the time. Even if the tire has not run for many kilometers, it will be replaced after a period of time, so you must look at the production date clearly when you replace the new tire. How to read the production date has been mentioned before. It is a 4-digit number on the tire. The first two digits indicate the production week and the last two digits indicate the year of production.

Change the left and right tires at the same time

Most driver friends usually change one of the tires if the tire is broken or the nail has to be replaced. At this time, it is best to replace both the left and right tires. In this way, you can avoid side slip caused by the friction between the left and right tires during sudden braking.

Also, it is important to note that the pattern of several tires must be consistent. If they are not the same, it will not only affect the service life of the tire, but also cause the braking resistance of the oil tanker to be inconsistent, which will affect the braking performance.

Oil tank truck

It is important to change tires

Driver friends usually wear tires to varying degrees when they use the car. If the tires are not replaced at the same time, it is best to perform tire replacement to obtain the best wear status and longer service life. Here’s one more thing, according to the different driving modes of the vehicle, the way of tire rotation is also different. For front-wheel-drive vehicles, new tires are best used on the front wheels, replacing old tires on the rear wheels. The opposite is true for rear-wheel-drive vehicles, as the wear on the drive wheels is greater than the wear on the driven wheels.

CIMC Cement Bulk Carrier

After changing tires, you must rebalance

Tanker manufacturers remind drivers to pay attention to the fact that each wheel must be rebalanced when changing tires. The wheel is a whole composed of tires and wheels. The mass distribution of each part of the whole cannot be very uniform. When the car wheels spin up at high speed, a dynamic imbalance will be formed, causing the phenomenon of wheel shake and steering wheel vibration of a tanker truck during driving. Dynamic balance can effectively avoid this situation.

When the vehicle is assembled at the factory, dynamic balancing tests are performed, so driver friends also need to perform dynamic balancing again when replacing new tires.

Causes and solutions of air suspension airbags for liquid tank trucks

With the increasing application of new materials in the special vehicle industry, aluminum alloy tank trucks are gradually accepted by the majority of users due to their own advantages such as light weight, more cargo loading, good appearance, and high residual value after recycling preferred. More and more air suspensions have been installed. So, what are the advantages of liquid tank truck air suspension? What are the common faults?

Advantages of air suspension

First, light weight. The biggest advantage of air suspension is its light weight, which is much lighter than traditional leaf spring suspension.

Second, it can be lifted. Lifting can be reflected in two aspects. One is that the axle can be lifted through air suspension to reduce tire wear and save fuel, which is especially suitable for one-way empty cars. The second is through the manual height valve in the air suspension system, the height of the vehicle loading platform can be adjusted within a certain range, convenient for loading and unloading cargo.

Third, the vehicle runs smoothly with good shock absorption performance. Compared with lightweight vehicles, vehicles with air suspension are more stable. The height of the air spring can be automatically adjusted according to the road conditions to reduce vibration and help protect the safety of the cargo.

CIMC Cement Bulk Carrier

Air suspension common failures

The most common failure of air suspension is airbag airbags or airbag wrinkles. The causes of these two situations are different, and the treatment methods are different. Different treatment should be used when they are encountered.

All airbags are airless

This situation is relatively simple to check. As long as we understand the air suspension structure, where can we start. The air suspension air source is connected by the braking system, and is stored in a special air cylinder through a pressure protection valve. Work through the filter to the core of the air suspension — the level valve, and then to the left and right airbags.

The reasons for this may be:

1. There is no air or low pressure for the air suspension special air cylinder — In order to ensure that the brake system has sufficient pressure, when the trailer air pressure is lower than 6 kg, the pressure protection valve will temporarily suspend air supply to the air suspension air cylinder;
2. The air pipe is blocked or discounted, but not air;
3. The connecting rod of the level valve falls off;
4. The level valve is damaged (this reason rarely occurs). As long as the cause of the fault is found, it is not difficult to solve it.

CIMC Sanitation truck

The airbag is inflated but the airbag is wrinkled

The reasons for this may be:

1. When the vehicle is being transported and hoisted, the airbag is stretched out a lot, and it is not reset properly, which causes the airbag to fold.

2. When the vehicle enters or leaves the maintenance workshop or on a large slope, it may also cause individual airbags to be stretched excessively, causing airbag wrinkles.

On-site processing method:

Disconnect the rubber connector under the vertical rod of the horizontal height valve from the axle, lift the rod up, wait for all the airbags to be inflated, and then install the rods back, and the airbag can return to normal state. In addition, if such a failure often occurs during driving, it is necessary to consider adding a limit device between the axle and the frame.

Brief introduction of concrete mixer truck water supply system

When the concrete mixer truck is stopped or suspended for a period of time, the problem of concrete retention will occur. If the concrete stays in the mixer for too long (usually limited to 30 to 80 minutes), the concrete will condense and even condense with the attached object, causing the mixer and other equipment to be scrapped. At the same time, due to the nature of the work or the environment, concrete will inevitably pollute the various systems of the vehicle.

After a transportation process is completed, if certain cleaning is not carried out, the condensed concrete will cause great damage to the paint of the conveyor and the machine, especially when there are corrosive additives in the concrete. Big. In order to prevent these problems from occurring and also to prepare for the next stage of transportation after the completion of one stage of transportation, the mixer trucks are equipped with a water supply system. The usual water supply system of the mixer truck is only used to flush the parts such as the feed hopper and the discharge tank, and is not used to supply or replenish the concrete.

CIMC Concrete Mixer Truck

The water supply system for cleaning uses a DC motor pump to extract water from the water storage tank, and flushes the mixer truck through a water pipe nozzle. The water storage capacity of its water tank is not large, generally between 200 ~ 250L. If the water supply system of the concrete mixer truck requires a large water tank, the water storage capacity is generally not less than 600L.

For some small- and medium-capacity mixer trucks, in order to simplify the structure of the water supply system, save power and reduce the weight of the bodywork, a water pump is often omitted and a pneumatic water spray system is used. It is a car chassis gas cylinder and a decompression auxiliary gas cylinder The gas pressure enters the stored water through the pipeline, and the water is ejected under the pressure. Pneumatic water supply system is composed of pressure box, ball valve, sequence valve, pressure reducing valve, safety valve and so on.

A water pipe is connected below the pressure water tank and communicates with the water source through a gate valve. Before adding water, first open the three-way ball valve and drain the compressed air in the pressure water tank. Then fill the water to the overflow port, and if there is water overflow, close the gate valve. When using the water in the pressure water tank, first open the ball valve, and the compressed air is connected to the water tank through the sequence valve, pressure reducing valve, safety valve, and the water can be pumped to the flushing pipe and the mixing drum along the pipeline and valve. When the vehicle is running, close the ball valve to ensure the brake air source.