Shock absorption device for high-pressure large-flow unloading return oil of hydraulic system

Abstract

The utility model discloses a shock absorption device for high-pressure large-flow unloading return oil of a hydraulic system, which comprises a shock absorption tank and a hydraulic oil diffuser arranged at the middle lower part of an inner cavity of the shock absorption tank, the top of the hydraulic oil diffuser is communicated with a return oil unloading port of a main cylinder through a high-pressure unloading return oil pipeline, and hydraulic damping holes are uniformly distributed on the side wall of the hydraulic oil diffuser; the bottom of the shock absorption tank is communicated with the liquid filling tank, the upper portion of the shock absorption tank is connected with a compressed air source through an air inlet pipeline, and a liquid level sensor and a pressure sensor are installed on the shock absorption tank. The damping device is installed on one side of an unloading oil return pipeline of a hydraulic system of hydraulic equipment of a large-scale rapid forging hydraulic machine, the pressure and the flow speed of unloaded high-pressure hydraulic oil are dispersed and buffered through compressed gas filled in the damping tank and the arrangement of the hydraulic oil diffuser, and the damping device is used for damping the pressure and the flow speed of the unloaded high-pressure hydraulic oil. The impact vibration caused by hydraulic oil to the liquid discharge pipeline during unloading is greatly reduced, and the stable operation of equipment is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure fluid shock absorption, in particular to a shock absorbing device for high-pressure and high-flow unloading and oil return of a hydraulic system of a rapid forging hydraulic press. Background Art

[0002] The hydraulic systems of rapid forging hydraulic presses are all high-pressure, high-flow systems. The maximum pressure when loading the master cylinder of presses commonly seen at home and abroad can reach 35MPa-45MPa. During the return stroke of the hydraulic press, to ensure rapid return and frequent switching of the equipment, the high-pressure oil inside the cylinder needs to be quickly discharged. Because the working pressure inside the cylinder is very high, the moment the master cylinder discharge proportional valve is opened, a large impact and vibration will be generated in the discharge pipe. Especially during the rapid forging process of the press, the master cylinder discharge proportional valve needs to be frequently opened and closed. The impact and vibration of the unloading return oil in the discharge pipe are particularly noticeable, which has seriously affected the service life of the equipment and the increase in the frequency of rapid forging.

[0003] To address this issue, the drainage systems commonly used at home and abroad basically adopt the following two design modes: 1) The design of an overhead oil tank shortens the unloading return oil drainage pipeline. Although it solves the impact and vibration problem in the pipeline when the cylinder is unloading at high pressure, the design of the overhead oil tank increases the height of the entire equipment. To ensure smooth traffic in the workshop and meet the lifting requirements of the highest point of the equipment, the required workshop height must be increased accordingly when using the overhead oil tank design, which will increase the construction cost of the entire workshop; 2) The design of a filling tank is used. The filling tank is located below the zero plane of the main installation of the fast forging hydraulic press. Although the equipment height is much lower than the design mode of the overhead oil tank, when the main cylinder is draining during the return stroke, the unloading and drainage pipeline from the top of the press to the filling tank is very long, resulting in large hydraulic shock and vibration in the pipeline. This has a significant impact on the life of related system components and seals. Long-term operation will cause problems such as frequent loosening of connectors, seriously affecting the normal use of the equipment. Utility Model Content

[0004] The purpose of the utility model is to provide a shock absorbing device for high-pressure and high-flow unloading return oil of a hydraulic system. By installing a diffuser in the shock absorbing tank, the balance of gas and oil pressure in the shock absorbing tank is controlled, and the impact vibration of high-pressure return oil on the hydraulic pipeline is reduced.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] After derrick hoists and puts in place, stamp fixedly derrick of derrick pin, change oil circuit then, make hydraulic oil lead to the base hydraulic oil cylinder, hoist that base puts in place and fixing with same control mode.

[0007] Preferably, the installation position of the shock absorber tank is close to the master cylinder discharge proportional valve.

[0008] Preferably, the diameter of the hydraulic damping holes is 7-10 mm, and adjacent hydraulic damping holes are staggered.

[0009] Preferably, a safety valve is installed on the upper part of the side wall of the shock-absorbing tank.

[0010] Preferably, a manual emergency exhaust valve is installed on the upper part of the side wall of the shock absorber tank.

[0011] Preferably, a muffler is installed at the air outlet of the exhaust duct.

[0012] Preferably, the liquid filling tank is located below the plane where the main equipment is located.

[0013] The working process of this utility model is:

[0014] The utility model is used for unloading high-pressure and high-flow oil return of the hydraulic system of a fast forging hydraulic press. Before working, the utility model first fills the liquid filling tank with gas. The hydraulic oil in the liquid filling tank flows upward into the shock absorber tank under the pressure of the gas, and the hydraulic oil level in the shock absorber tank gradually increases. When the hydraulic oil level in the shock absorber tank reaches the set height, the air intake solenoid valve on the air intake pipe is opened, and the upper part of the shock absorber tank is inflated at the same time until the pressure in the liquid filling tank reaches the design pressure of the hydraulic system and the inflation is stopped; the main cylinder discharge proportional valve installed on the return pipe of the main cylinder is started to quickly and massively discharge high-pressure hydraulic oil to the hydraulic oil diffuser. The pressure and flow of the high-pressure hydraulic oil are dispersed through the hydraulic damping hole. After the dispersed hydraulic oil enters the shock absorber tank, the compressed air and hydraulic oil in the shock absorber tank further buffer the impact vibration generated by the hydraulic oil. As the hydraulic oil level in the shock absorber tank rises, the space occupied by the compressed air in the shock absorber tank decreases, and the air pressure increases. When the pressure in the shock absorber tank is greater than the pressure in the liquid filling tank, the hydraulic oil in the shock absorber tank flows into the liquid filling tank. When the pressure in the shock absorber tank is equal to the pressure in the liquid filling tank, the hydraulic oil in the shock absorber tank no longer flows into the liquid filling tank. The pressure and hydraulic oil level of the shock absorber tank maintain a dynamic balance with the pressure and hydraulic oil level in the liquid filling tank, and the cycle repeats as described above during the operation of the equipment.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] (1) The utility model is installed on one side of the unloading return oil pipeline of the hydraulic system of the hydraulic equipment. By filling the shock absorber tank with compressed gas and setting a hydraulic oil diffuser, the pressure and flow rate of the unloaded high-pressure hydraulic oil are dispersed and buffered, so that the pressure in the shock absorber tank and the filling tank and the hydraulic oil level are kept in dynamic balance, which greatly reduces the impact and vibration of the hydraulic oil on the discharge pipeline and ensures the smooth operation of the equipment.

[0017] (2) The shock absorber tank in the utility model is used to store hydraulic oil and compressed air. It is installed near the main cylinder discharge proportional valve, shortening the stroke of the high-pressure hydraulic oil and reducing the impact and vibration on the discharge pipe;

[0018] (3) The bottom of the hydraulic oil diffuser in the utility model is closed, and hydraulic damping holes are evenly distributed on the side wall, which plays a role in dispersing the high-pressure and large-flow hydraulic oil, changing its path, reducing the pressure of the hydraulic oil, and avoiding direct impact on the inner wall of the shock absorbing tank;

[0019] (4) The utility model provides a safety valve on the shock absorber tank. When the pressure inside the shock absorber tank exceeds the set pressure of the safety valve, the safety valve opens to relieve the pressure, thereby preventing the pressure inside the tank from being too high.

[0020] (5) The utility model installs a manual emergency valve on the shock absorber tank, which is used to manually release the pressure of the shock absorber tank when the electric exhaust valve fails;

[0021] (6) The utility model installs a muffler at the bottom of the exhaust pipe to eliminate the noise generated when high-pressure compressed air is discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Figure 2 It is a schematic diagram of the actual installation of the utility model;

[0024] Figure 3 yes Figure 2 Side view of;

[0025] Figure 4 It is a schematic diagram of the structure of the hydraulic oil diffuser installed in the shock absorbing tank;

[0026] In the figure: 1. Shock absorber tank, 2. Hydraulic oil diffuser, 3. Liquid level sensor, 4. Safety valve, 5. Manual emergency exhaust valve, 6. Solenoid exhaust valve, 7. Solenoid intake valve, 8. Pressure sensor, 9. Muffler, 10. Master cylinder discharge proportional valve, 11. Master cylinder, 12. Liquid filling tank, 13. Hydraulic damping hole, 14. Intake pipe, 15. Exhaust pipe. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] like Figures 1 to 4 The hydraulic system shown is a high-pressure, high-flow unloading and return oil shock absorber device, comprising a shock absorber tank 1 mounted on the side wall of the crossbeam on the equipment, a hydraulic oil diffuser 2 is provided in the lower middle part of the inner cavity of the shock absorber tank 1, the top of the hydraulic oil diffuser 2 is connected to the return oil unloading port of the master cylinder 11 through a high-pressure unloading return oil pipeline, a master cylinder discharge proportional valve 10 is installed on the high-pressure unloading return oil pipeline, and hydraulic damping holes 13 are evenly distributed on the side wall of the hydraulic oil diffuser 2; the bottom of the shock absorber tank 1 is connected to the filling tank 12 through an oil delivery pipeline The filling tank 12 is located below the shock absorber tank 1. The upper part of the shock absorber tank 1 is connected to the compressed air source through an air intake pipe 14. An electromagnetic air intake valve 7 is installed on the air intake pipe 14. An exhaust pipe 15 is also provided on the upper part of the shock absorber tank 1. An electromagnetic exhaust valve 6 is installed on the exhaust pipe 15. A liquid level sensor 3 and a pressure sensor 8 are installed on the shock absorber tank 1. The liquid level sensor 3, the electromagnetic exhaust valve 6, the electromagnetic air intake valve 7, the pressure sensor 8 and the master cylinder discharge proportional valve 10 are all connected to the remote control center.

[0029] The installation position of the shock absorber tank 1 is close to the master cylinder discharge proportional valve 10.

[0030] The diameter of the hydraulic damping holes 13 is 7-10 mm, and adjacent hydraulic damping holes 13 are staggered.

[0031] A safety valve 4 is installed on the upper part of the side wall of the shock absorbing tank 1. A manual emergency exhaust valve 5 is installed on the upper part of the side wall of the shock absorbing tank 1.

[0032] A muffler 9 is installed at the air outlet of the exhaust duct 15 .

[0033] The liquid filling tank 12 is located below the plane where the main equipment is located.

[0034] The working process of this utility model is:

[0035] The utility model is used for unloading high-pressure and high-flow return oil of the hydraulic system of a fast forging hydraulic press. Before working, the utility model first fills the liquid filling tank 12 with gas. The hydraulic oil in the liquid filling tank 12 flows upward to the shock absorbing tank 1 under the pressure of the gas, and the hydraulic oil level in the shock absorbing tank 1 gradually increases. When the hydraulic oil level in the shock absorbing tank 1 reaches the set height, the air intake solenoid valve 7 on the air intake pipe 14 is opened, and the upper part of the shock absorbing tank 1 is inflated at the same time until the pressure in the liquid filling tank 12 reaches the design pressure required by the hydraulic system and the inflation is stopped; the master cylinder discharge proportional valve 10 installed on the return pipe of the master cylinder 11 is started to quickly and massively discharge high-pressure hydraulic oil to the hydraulic oil diffuser 2. The pressure and flow of the high-pressure hydraulic oil are dispersed through the hydraulic damping hole 13. After the dispersed hydraulic oil enters the shock absorbing tank 1, the compressed air and hydraulic oil in the shock absorbing tank 1 further buffer the impact vibration generated by the hydraulic oil; as the liquid level of the hydraulic oil in the shock absorbing tank 1 rises, the space occupied by the compressed air in the shock absorbing tank 1 decreases, and the air pressure increases. When the pressure in the shock absorbing tank 1 is greater than the pressure in the liquid filling tank 12, the hydraulic oil in the shock absorbing tank 1 flows into the liquid filling tank 12; when the pressure in the shock absorbing tank 1 is equal to the pressure in the liquid filling tank 12, the hydraulic oil in the shock absorbing tank 1 no longer flows into the liquid filling tank 12. The pressure and hydraulic oil level of the shock absorbing tank 1 maintain a dynamic balance with the pressure and hydraulic oil level in the liquid filling tank 12, and circulate back and forth as described above during the operation of the equipment.

[0036] After the oil pump is fully charged, the oil pump with one hand is discharged from the oil pump outlet on the hydraulic platform, and the oil pumping station is stopped up and down, so that the oil pumping station can directly reach the oil pumping station by pumping out the oil pumping station oil pumping station.

[0037] The above are only preferred embodiments of the present invention. It should be noted that those skilled in the art can make other equivalent variations and improvements based on the technical enlightenment provided by the present invention, which should also be considered as the scope of protection of the present invention.

Claims

1. A high-pressure, high-flow, unloading and oil return shock absorber for a hydraulic system, characterized by: The invention comprises a shock absorbing tank (1) mounted on the side wall of the crossbeam of the equipment, a hydraulic oil diffuser (2) is provided in the middle and lower part of the inner cavity of the shock absorbing tank (1), the top of the hydraulic oil diffuser (2) is connected to the return oil unloading port of the master cylinder (11) through a high-pressure unloading return oil pipeline, a master cylinder discharge proportional valve (10) is installed on the high-pressure unloading return oil pipeline, and hydraulic damping holes (13) are evenly distributed on the side wall of the hydraulic oil diffuser (2); the bottom of the shock absorbing tank (1) is connected to the liquid filling tank (12) through an oil delivery pipeline, and the liquid filling tank (12) is located below the shock absorbing tank (1). The upper part of the shock absorbing tank (1) is connected to the compressed air source through an air intake pipe (14), and an electromagnetic air intake valve (7) is installed on the air intake pipe (14). The upper part of the shock absorbing tank (1) is also provided with an exhaust pipe (15), and an electromagnetic exhaust valve (6) is installed on the exhaust pipe (15). A liquid level sensor (3) and a pressure sensor (8) are installed on the shock absorbing tank (1). The liquid level sensor (3), the electromagnetic exhaust valve (6), the electromagnetic air intake valve (7), the pressure sensor (8) and the master cylinder discharge proportional valve (10) are all connected to the remote control center.

2. The vibration absorbing device according to claim 1, characterized in that: The installation position of the shock absorbing tank (1) is close to the master cylinder discharge proportional valve (10).

3. The vibration absorbing device according to claim 1, characterized in that: The diameter of the hydraulic damping holes (13) is 7-10 mm, and adjacent hydraulic damping holes (13) are staggered.

4. The vibration absorbing device according to claim 1, characterized in that: A safety valve (4) is installed on the upper portion of the side wall of the shock absorbing tank (1).

5. The vibration absorbing device according to claim 1, characterized in that: A manual emergency exhaust valve (5) is installed on the upper portion of the side wall of the shock absorbing tank (1).

6. The vibration absorbing device according to claim 1, characterized in that: A silencer (9) is installed at the air outlet of the exhaust pipe (15).

7. The vibration absorbing device according to claim 1, characterized in that: The liquid filling tank (12) is located below the plane where the main equipment is located.

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