How to check whether the automobile air shock absorber works well?
The air spring products of Shanghai Songxia Pneumatic Butterfly Valve Co., Ltd. are mainly used on the bases of buses, luxury cars, trucks, commercial vehicles, rail cars, industrial machinery, industrial equipment, etc. Songxia welcomes new and old customers to call and inquire: 021-60344211 air spring pneumatic butterfly valve is mainly used to rapidly attenuate the vibration of the frame and body, and improve the smoothness and comfort of the car. The car suspension system is generally equipped with shock absorbers. The shock absorber is a vulnerable part in the use of the vehicle. The working quality of the shock absorber will directly affect the stability of the vehicle and the life of other parts. Therefore, we should keep the shock absorber in good working condition. So how to check whether the shock absorber works well? Song Xia will share with you
1. Stop the car after driving 10km on the road with poor road conditions, touch the shock absorber housing with your hand. If it is not hot enough, it means that there is no resistance inside the shock absorber and the shock absorber does not work. At this time, appropriate lubricating oil can be added and the test can be carried out again. If the shell is hot, it means that there is a lack of oil inside the shock absorber, and sufficient oil should be added; Otherwise, the shock absorber is invalid.
2. When the car drives slowly and brakes urgently, if the car vibrates violently, it indicates that there is a problem with the shock absorber.
3. Press the bumper firmly and then release it. If the car jumps 2-3 times, it means that the air spring works well.
4. After confirming that the shock absorber is defective or invalid, check whether the shock absorber has oil leakage or traces of obsolete oil leakage.
5. The oil seal washer and seal washer are broken and damaged, and the nuts of the oil storage cylinder cover are loose.
6. Dismantle the shock absorber and put it upright, clamp the lower connecting ring on the bench clamp, pull and press the shock absorber rod several times with force. At this time, there should be stable resistance. The resistance of pulling up (restoring) should be greater than the resistance of pressing down. If the resistance is unstable or no resistance, it may be due to lack of oil in the shock absorber or damage of valve parts, repair or replace the parts.
If oil leakage is found, first tighten the nuts of the oil cylinder head. If the shock absorber still leaks oil, it may be that the oil seal and sealing washer are damaged and invalid. Replace the seals with new ones. If the oil leakage still cannot be eliminated, pull out the shock absorber rod. If you feel stuck or the weight is different, further check whether the clearance between the piston and the cylinder barrel is too large, whether the piston connecting rod of the shock absorber is bent, and whether the surface of the piston connecting rod and the cylinder barrel are scratched or pulled.
If there is no oil leakage from the automotive air shock absorber, check whether the shock absorber connecting pin, connecting rod, connecting hole, rubber bushing, etc. are damaged, desoldered, cracked or fallen off. If the above inspection is normal, the shock absorber shall be further disassembled to check whether the fit clearance between the piston and the cylinder barrel is too large, whether the cylinder barrel is strained, whether the valve seal is good, whether the valve disc and the valve seat fit tightly, and whether the extension spring of the shock absorber is too soft or broken. The method of grinding or replacing parts shall be adopted according to the situation.
In addition, the shock absorber will make a noise in actual use, which is mainly caused by collision between the shock absorber and the leaf spring, frame or shaft, damage or falling off of the rubber pad, deformation of the dust cylinder of the shock absorber, insufficient oil and other reasons. Find out the cause and repair it.
After inspection and repair, the shock absorber shall be tested for working performance on a special test bench. When the resistance frequency is 100 ± 1mm, the resistance of its stretching stroke and compression stroke shall meet the requirements. For example, the maximum resistance of Jiefang CAl091 stretching stroke is 2156-2646N, and the maximum resistance of compression stroke is 392-588N; The maximum resistance of Dongfeng truck in stretching stroke is 2450-3038N, and the maximum resistance in compression stroke is 490-686N. If there is no test condition, we can also adopt an empirical approach, that is, use an iron bar to penetrate into the lower lifting ring of the shock absorber, step on its two ends with both feet, hold the upper lifting ring with both hands and pull it back and forth for 2-4 times. When it is pulled up, the resistance is great, and when it is pressed down, it does not feel laborious. Moreover, the resistance of stretching has recovered compared with that before repair, and there is no sense of empty travel, which indicates that the shock absorber is basically normal.
The above is about how to check whether the shock absorber works well. For more information on air spring procurement, please visit the official website of Shanghai Songxia Pneumatic Butterfly Valve Co., Ltd.: //www.shsxjzq.cn/

Application of thrust free rotary compensator
The rotary compensator is more and more widely used in the heat supply network because of its compact structure, large compensation, small moving resistance, zero leakage, no maintenance and many other advantages. It is used for displacement compensation installation of heat supply network pipeline, mainly composed of inner and outer pipes, sealing packing and spring compression installation. The utility model is characterized in that the fit clearance between the spring compression flange and the inner pipe is small with a high-precision processing wrist. The utility model is applicable to the combination of two to three absorption compensators for the axial displacement and axial thrust of the heat supply network pipes. The product has good sealing performance, no need to stop production and maintenance. Moreover, the product adopts fine processing, which makes the coordination between product parts more reasonable, the assembly more accurate, and ensures the product concentricity. Only when the product accepts angular and lateral displacement can it be greatly improved, and the stability is good, and the safety and sealing of the product are improved.
The rotary compensator is a new type of compensator for thermal pipe thermal contraction compensation. The structure of rotary compensator is mainly composed of integral seal seat, seal gland, reducer, antifriction centering bearing, seal data, rotating cylinder and other components. The device needs more than two pairs on the thermal pipeline to form a relative rotating absorption pipeline thermal displacement, so as to reduce the stress of the pipeline.
Rotary compensator is widely used in modern industry.
1. For heat supply, in order to avoid deformation or damage of the pipeline due to thermal elongation or temperature stress when the heat supply pipeline heats up, it is required to set a compensator on the pipeline to compensate for the thermal elongation of the pipeline, thus reducing the stress on the pipe wall and the force acting on the valve or support structure.
2. After the application of overhead pipeline heating pipeline device is put into operation, as the pipeline is heated by heat medium and causes the pipeline to be heated and stretched, measures should be taken to compensate for the thermal elongation of the pipeline. Rotary compensation has the advantage of greatly reducing the construction cost of the project, and its structure is simple, the device is convenient, and no maintenance is required, which overcomes the defects of sleeve type compensator, such as easy leakage and need to stop production for maintenance. Therefore, rotary compensator should be applied in overhead pipeline.
3. The application of rotary compensator in petroleum pipeline, as a new type of compensator - rotary compensator, has been recognized by most people in petrochemical installation. Comparing the advantages and disadvantages of the rotary compensator with other compensation installation, it can be clearly seen that the rotary compensator has the characteristics of simple operation, cost reduction, good compensation effect, etc.
4. The application of rotary compensator in steam transportation theoretically proves that the application of rotary compensator in steam pipeline can significantly reduce the number of compensators, thus reducing the project cost and shortening the project time.