Pneumatic butterfly valve is a kind of high elastic body, which is made of ordinary materials. The composite ball valve is composed of a metal screw ball valve and high-quality vulcanization wrapped outside.
In terms of corrosion prevention, the rubber ball valve has previously introduced the electroplating metal protection method. The electroplating metal coating anti-corrosion protection method is not only to prevent the ball valve from being eroded, but also to enhance the appearance of the ball valve to a certain extent. It also strengthens the working mechanism of the ball valve on a certain basis, improves the hardness and stability of the ball valve, Therefore, the method of metal protective layer is often used for ball valves on the erosion prevention layer.
The corrosion prevention method of ball valve is to prevent the corrosion of ball valve by keeping the chemical properties of metal zinc in the air unchanged and forming a dense zinc oxide film in humid air. If there are many erosions in the air, the ball valve should be passivated to increase its protection ability and aesthetic level.
Pneumatic butterfly valve has nonlinear elasticity, and its performance curve can be designed into an ideal shape.
Things that are out of reach are always blown to perfection. In order to better understand the air suspension system, we compared it with the traditional steel plate ball valve structure from four aspects of comfort, economy, safety and reliability of the air suspension system:
1. Comfort
① When the load mass of the spring of the steel plate ball valve suspension changes, the natural frequency of the vehicle system will change significantly. The bias frequency of the steel plate ball valve is about 1.7-2.3Hz when it is fully loaded, which is greater when it is unloaded, so the overall comfort is poor.
② The air suspension has typical nonlinear stiffness and has obvious cushioning effect on vibration and impact. The test data shows that under the same state, the impact force of the pneumatic butterfly valve system vehicle on the road surface is about 1/3-1/2 less than that of the steel plate ball valve suspension vehicle.
③ The bias frequency of the air suspension is about 1.35Hz (within the range of 1.0Hz to 1.5Hz), so the air suspension can effectively isolate the vibration of the vehicle from the ground. The vehicle with air suspension has good curve trafficability (that is, the speed when turning can be higher than that of the vehicle with steel plate ball valve), and the braking distance is shorter (the braking force is evenly distributed, and the effective braking power is large), The rearview mirror image is clearer and more stable, and the driver is more comfortable, less tired, and more focused.
④ Under the action of the height valve, the body height of the pneumatic butterfly valve suspension system basically remains unchanged when the vehicle load changes, and the offset frequency changes slightly, thus ensuring the comfort under no-load. The system equipped with lifting valve can adjust the height of the whole vehicle body within a certain range, so as to meet different requirements for loading and unloading, and improve the trafficability of the vehicle.
The comfort of pneumatic butterfly valve suspension is about 30% higher than that of steel plate ball valve suspension.
2. Economy
① The pneumatic butterfly valve suspension system can improve the reliability of the vehicle, reduce the failure rate of the on-board electrical system by 30-40%, extend the service life of tires and brake pads, reduce the maintenance technology of electrical, air conditioning, exhaust system, axle, body and chassis, extend the service life of the vehicle and increase depreciation.
② The service life of tires has been increased by more than 50% (for freight trucks with steel plate ball valves, the tires are generally replaced once every 50000 km; for air suspension tires, they are usually replaced once every 100000 km)
③ The tracking research conducted by Canadian research institutions on several logistics enterprises for many years shows that the fuel consumption of vehicles with air suspension system is 3-5% less than that of vehicles with steel plate ball valve.
④ Reduce the impact on the road, protect the road surface and reduce the maintenance cost of the road.
The economy of pneumatic butterfly valve suspension is 20% higher than that of steel plate ball valve suspension.
3. Security
① For multi axle vehicles, the air suspension ensures that the load of each axle is evenly distributed, avoiding the possibility that a single axle in the steel plate ball valve suspension bears all the loads; For a single axle, the air suspension basically ensures that the forces on the wheels on both sides are evenly distributed.
② The air suspension can keep the pure rolling contact between the tire and the ground as far as possible, basically achieving a good braking effect; The braking force is balanced on the left and right, the effective braking force power is increased, and the braking distance is shortened.
③ The pneumatic butterfly valve suspension system takes the safety of the system into consideration. In case of emergency, such as rupture, pipeline leakage, the pneumatic butterfly valve suspension system can ensure that the frame is stable on the internal buffer fast, or the axle is fast to the limit, etc. The vehicle will drive to the maintenance station for repair under vulgar conditions.
The pneumatic butterfly valve suspension is safer than the steel plate ball valve suspension
4. Reliability
① Bushings or high-quality insulating grease are used at the nodes where the pneumatic butterfly valve suspension rotates relative to each other. It overcomes rigid contact and friction, which not only alleviates the impact between parts, but also greatly improves the reliability of the system. For the service life of some key parts and components, if they have passed 5 million fatigue tests, the service life can reach more than 200000 km.
② The key components of pneumatic butterfly valve suspension are subject to rigorous fatigue test in the laboratory or reliability test under harsh environment, and have been verified by many tests.
③ The pneumatic butterfly valve suspension system can improve the reliability of the chassis and body electrical system at the same time. The pneumatic butterfly valve suspension is more reliable than the steel plate ball valve suspension.
The working principle of the air suspension is to use the air compressor to form compressed air and send the compressed air to the air chamber of the ball valve and shock absorber to change the height of the vehicle. The height sensor is set near the front wheel and rear wheel. According to the output signal of the height sensor, the microcomputer judges the change of the body height, and then controls the compressor and exhaust valve to compress or extend the ball valve, so as to achieve the effect of vibration reduction. The air suspension system replaces the steel plate ball valve of the original vehicle, and cooperates with the air supply device, height adjustment device, pneumatic and pneumatic control devices to ensure that the vehicle can adapt to the load, speed, road conditions, etc., which can better isolate the impact, vibration and noise of the road surface, improve the vehicle's handling and safety while improving comfort. Air suspension has irreplaceable advantages over conventional suspension. Therefore, with the popularization and improvement of this technology, air suspension has been widely used abroad, and its application in China is gradually improving.