At present, the new normal state of economic development will continue. The transformation and upgrading of China's machinery manufacturing industry is of great significance and imminent. As long as we follow the development of five major innovation, coordination, green, open, sharing ideas, adhere to the direction of sustainable development, the development road of transformation and upgrading, we will make our machinery manufacturing industry bigger and stronger, to achieve the mechanical manufacturing industry from production to production and service changes, from extensive management to lean the management of change, from low-end manufacturing shift to high-end manufacturing. During the use of hydraulic press, there will be various kinds of small faults. So we need to maintain routine machines when we are using them. Here are some basic knowledge.
One. The cause of the big noise of the hydraulic press
1. relief valve is not stable, such as game currency forming small hydraulic press slide valve and the valve hole with improper or cone valve and valve seat contact is dirt stuck, damping hole blocking, spring distortion or failure so that the valve is stuck or mobile. The valve hole, causing the system pressure fluctuations and noise. For this reason, we should pay attention to cleaning and dredging the nunkong hole, check the relief valve, if it is found to be damaged or wear out of the regulations, it should be repaired or replaced in time.
2. the quality of the hydraulic pump or the hydraulic motor is not good, which is usually the main part of the noise in the hydraulic transmission. The manufacturing quality of the hydraulic pump of game currency forming small hydraulic press is not good, the accuracy is not up to the technical requirements, the fluctuation of pressure and flow is large, the phenomenon of oil trapped is not well eliminated, the poor sealing and the poor bearing quality are all the main reasons for the noise. In use, the hydraulic pump parts are worn, the gap is too large, the flow is insufficient, the pressure is easy to fluctuate, and the noise will also be caused. In the face of the above reasons, one is the selection of good quality hydraulic pump or hydraulic motor, the two is to strengthen the maintenance and maintenance, for example if the tooth profile precision of gear is low, should meet the requirements of research of gear, the contact surface; if the vane pump has trapped oil phenomenon, should be modified triangular groove plate, eliminate the trapped oil; if the hydraulic pump axial clearance is too large and the amount of oil shortage, it should be repaired, the axial clearance in the allowable range; if the hydraulic pump selection is wrong, it should be replaced
3. air intrusion into the hydraulic system is the main cause of noise. Because the air invasion game currency molding hydraulic machine system, in the low pressure area is larger, when the flow to the high pressure area is compressed, the volume suddenly reduced, and when it flows into the low pressure area, the volume suddenly increased, the sudden change of the bubble volume, "explosion" phenomenon, resulting in noise, this phenomenon is known as a hole". For this reason, the exhaust device is often set up on the hydraulic cylinder for the exhaust. In addition, after driving, it is also a common method to make the execution parts exhaust several times with a quick full stroke.
The improper adjustment of the 4. reversing valve makes the valve core move too fast, resulting in the reversing impact, resulting in noise and vibration. In this case, if the game currency forming small hydraulic reversing valve is a hydraulic reversing valve, then the throttling element should be adjusted and controlled to make the commutation stable and no impact. When working, the valve core of the hydraulic valve is supported on the spring. When the frequency is similar to the pulsating frequency of the oil pump rate or the frequency of other vibration sources, it will cause vibration and noise. At this time, by changing the natural frequency of the pipeline system, changing the position of the control valve or adding the energy accumulator properly, it can prevent vibration and noise reduction.
Two, the hydraulic press does not hold pressure how to do?
The 1. pressure holding time is too long and the pressure is not guaranteed.
The solution: because the holding time is too long, the hydraulic oil is lacking, and it is not enough to provide pressure. In order to solve this problem, the method of continuous oil filling can be used. In the process of pressure protection, it is necessary to hold the pressure according to the leakage of the pressure of the complement system.
2. hydraulic cylinder leakage caused by internal and external pressure.
Solution: solve the problem fundamentally. This situation needs to improve the coordination between the hydraulic cylinder hole, the piston and the piston rod and the manufacturing precision. In order to meet the requirements of precision, the problem of non pressure protection produced by internal and external leakage can be effectively reduced.
3. the leakage of various control valves is not guaranteed.
Solution: to solve this problem fundamentally, we need to improve the machining accuracy and accuracy of the valve body. In addition, we should pay attention to the structure of the valve body. These are the necessary precautions that can effectively enhance the reliability and reliability of the valve.
Three, what should be paid attention to during the cleaning of hydraulic press
1. check and clean up
The hydraulic valve clearance of small surface pollution of hydraulic machine is: use brush, metal scraper, hydraulic valve clearance silk surface adhesion and healing, careful not to damage the surface of hydraulic valve. In particular, do not scratch the mounting surface of the plate valve.
2. dismantling
Before the disassembly of small hydraulic press, we should grasp the structure of hydraulic valve and the way of connection between parts, and remember the location relation between parts, and make appropriate mark when removing. Can not be forced to dismantle, so as not to damage the hydraulic valve.
3. cleaning
The small hydraulic press's valve body and valve core are placed on the tray of the washing box, heating and foaming. The compressed air is sent to the bottom of the cleaning tank, and the residual dirt is cleaned up by the stirring effect of the bubbles. Ultrasonic cleaning is available under certain conditions.
4. fine washing
The cleaning liquid is cleaned with high pressure, and the hot air is dried at the end. The existing enterprises can use the existing cleaning agents, and some occasions can also use organic cleaning agents, such as diesel oil and gasoline. Some inorganic cleaning fluid is toxic, heating volatilization can be toxic, should be used carefully; organic cleaning liquid is flammable, should pay attention to fire prevention. Selection of cleaning liquid, pay attention to the Zuo rot, to avoid making the body
