Hydraulic system of horizontal high-pressure press

Abstract

The utility model discloses a horizontal high pressure press hydraulic system, which comprises a working unit and a hydraulic unit, the hydraulic unit comprises a servo motor, an oil pump and an oil tank, the servo motor drives the oil pump to pump hydraulic oil in the oil tank to a material jacking oil cylinder, a main oil cylinder and two auxiliary oil cylinders through pipelines; the hydraulic unit further comprises an ejection valve, a main cylinder valve and auxiliary cylinder valves, and working oil ports of the ejection valve, the main cylinder valve and the auxiliary cylinder valves are connected to the ejection oil cylinder, the main oil cylinder and the two auxiliary oil cylinders respectively. In the advancing process of the front half section, the main oil cylinder and the movable mold are driven by the two auxiliary oil cylinders to move forwards, high hydraulic oil pressure is not needed, and therefore the effect of reducing energy consumption is achieved, the pressure of the hydraulic oil acting on the main oil cylinder is increased through the pressurizer, namely high pressure output is achieved with low power, and the energy consumption is reduced. Meanwhile, a common motor is replaced by the servo motor, and compared with the common motor, the noise is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of presses, in particular to a hydraulic system of a horizontal high-pressure press. Background Art

[0002] Press is a widely used general-purpose machine that can be used for cutting, punching, blanking, bending, riveting, die forging and forming, etc. Presses can be divided into vertical presses and horizontal presses based on the direction of action. Vertical presses can achieve rapid mold closing by their own weight, but horizontal presses are different from vertical presses. When closing the mold, horizontal presses need to be equipped with a high-power hydraulic system to achieve high efficiency. However, the traditional hydraulic system has a complex structure and will produce greater noise and huge energy waste. Utility Model Content

[0003] In order to overcome the defects of the prior art, the technical problem to be solved by the utility model is to propose a horizontal high-pressure press hydraulic system, which optimizes the hydraulic system while ensuring the working power, and at the same time has the effect of reducing noise and saving energy.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a hydraulic system of a horizontal high-pressure press, comprising a working unit and a hydraulic unit, wherein the working unit comprises a material ejection oil cylinder, and a movable die and a fixed die symmetrically arranged with respect to the ejection direction of the material ejection oil cylinder, wherein a main oil cylinder is arranged on the side of the movable die facing away from the fixed die, and when the press is pressed and formed, the main oil cylinder presses the movable die toward the fixed die, and the fixed die is provided with two auxiliary oil cylinders on both sides of the main oil cylinder, and the hydraulic unit comprises a servo motor, an oil pump and an oil tank, and the servo motor drives the oil pump to pump the hydraulic oil in the oil tank to the fixed die through a pipeline The lifting cylinder, the main cylinder and the two auxiliary cylinders; the hydraulic unit also includes a lifting valve, a main cylinder valve and an auxiliary cylinder valve, the lifting valve and the main cylinder valve are three-position four-way solenoid valves, the auxiliary cylinder valve and the diverter valve are two-position four-way solenoid valves; the oil outlet of the oil pump is respectively connected to the oil inlet of the lifting valve, the main cylinder valve and the auxiliary cylinder valve, the oil outlet of the lifting valve, the main cylinder valve and the auxiliary cylinder valve is connected to the oil tank, and the working oil ports of the lifting valve, the main cylinder valve and the auxiliary cylinder valve are respectively connected to the lifting cylinder, the main cylinder and the two auxiliary cylinders.

[0006] The preferred technical solution of the utility model is that it also includes a PLC controller and a pressure sensor, wherein the pressure sensor is connected to the oil outlet of the oil pump, and the pressure sensor is connected to the PLC controller through a circuit to monitor the pressure in the hydraulic oil circuit, and the ejection valve, the main cylinder valve and the auxiliary cylinder valve are connected to the PLC controller.

[0007] The preferred technical solution of the utility model is that the master cylinder is provided with a main chamber and a sub-chamber, one working oil port of the master cylinder valve is connected to the sub-chamber, the other working oil port is connected to a diverter valve, two working oil ports of the diverter valve are connected to the main chamber, the return oil port of the diverter valve is connected to the oil tank, and the diverter valve is connected to the PLC controller; a damper is provided on the oil circuit connecting the master cylinder valve to the sub-chamber, a booster is provided on the oil circuit connecting one of the working oil ports of the diverter valve to the main chamber, and a pressure maintaining valve is provided on the other.

[0008] An optimal technical solution of the utility model is that a pressure switch valve is provided between the oil outlet of the oil pump and the oil tank, and the pressure switch valve is a two-position three-way valve to ensure the safety of the hydraulic oil circuit during idling standby.

[0009] An optimal technical solution of the utility model is that a pressure relief protection valve is further provided between the oil outlet of the oil pump and the oil tank, so as to relieve the pressure when the pressure of the hydraulic oil circuit reaches a set threshold value, so as to protect the safety of the oil circuit.

[0010] The preferred technical solution of the utility model is that it also includes a heat dissipation unit, which includes a heat dissipation motor and a heat dissipation pump. The heat dissipation pump is connected to the oil circuit of the oil tank and a heat dissipation component is arranged. The heat dissipation component includes a radiator and a heat dissipation fan. The oil inlet of the radiator is communicated with the oil outlet of the heat dissipation pump, and the oil outlet of the radiator is connected to the oil tank. The heat dissipation motor drives the heat dissipation pump so that the hydraulic oil is dissipated in the heat dissipation unit. When dissipating heat, the heat dissipation fan rotates to cool the radiator.

[0011] The beneficial effects of the utility model are:

[0012] In the first half of the forward process of this case, two auxiliary cylinders drive the main cylinder and the movable mold to perform forward actions. It does not require very high hydraulic oil pressure, thereby reducing energy consumption. When boosting is required, the PLC controller controls the main cylinder valve and the diverter valve, and increases the hydraulic oil pressure acting on the main cylinder through the booster, that is, achieving higher pressure output with lower power. At the same time, a servo motor is used instead of an ordinary motor. During use, the PLC controller is used in combination with a servo driver to accurately control the servo motor to achieve the best energy consumption ratio. Compared with ordinary motors, the noise is also lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the principle of a hydraulic system of a horizontal high-pressure press provided in a specific embodiment of the utility model;

[0014] In the figure:

[0015] 1. Working unit; 2. Hydraulic unit; 11. Ejection cylinder; 12. Moving mold; 13. Fixed mold; 14. Main cylinder; 15. Auxiliary cylinder; 21. Servo motor; 22. Oil pump; 23. Oil tank; 24. Ejection valve; 25. Main cylinder valve; 26. Auxiliary cylinder valve; 27. Pressure sensor; 141. Main chamber; 142. Sub-chamber; 251. Diverter valve; 252. Damper; 253. Supercharger; 254. Pressure maintaining valve; 28. Pressure switch valve; 29. ​​Pressure relief protection valve; 3. Cooling unit; 31. Cooling motor; 32. Cooling pump; 33. Cooling assembly; 331. Radiator; 332. Cooling fan. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0017] Embodiment 1: A hydraulic system of a horizontal high-pressure press comprises a working unit 1 and a hydraulic unit 2. The working unit 1 comprises a push-up cylinder 11, and a movable die 12 and a fixed die 13 symmetrically arranged with respect to the push-up direction of the push-up cylinder 11. A main cylinder 14 is arranged on the side of the movable die 12 facing away from the fixed die 13. When the press is pressed and formed, the main cylinder 14 presses the movable die 12 toward the fixed die 13. The fixed die 13 is provided with two auxiliary cylinders 15 on both sides of the main cylinder 14. The hydraulic unit 2 comprises a servo motor 21, an oil pump 22 and an oil tank 23. The servo motor 21 drives the oil pump 22 to pump the hydraulic oil in the oil tank 23 through the pipeline to the top-loading cylinder 11, the main oil cylinder 14 and the two auxiliary oil cylinders 15; the hydraulic unit 2 also includes a top-loading valve 24, a main cylinder valve 25 and an auxiliary cylinder valve 26, the oil outlet of the oil pump 22 is respectively connected to the oil inlet of the top-loading valve 24, the main cylinder valve 25 and the auxiliary cylinder valve 26, the oil outlet of the top-loading valve 24, the main cylinder valve 25 and the auxiliary cylinder valve 26 is connected to the oil tank 23, and the working oil ports of the top-loading valve 24, the main cylinder valve 25 and the auxiliary cylinder valve 26 are respectively connected to the top-loading cylinder 11, the main oil cylinder 14 and the two auxiliary oil cylinders 15. Furthermore, the ejector valve 24 and the main cylinder valve 25 are three-position four-way solenoid valves, and the auxiliary cylinder valve 26 and the diverter valve 251 are two-position four-way solenoid valves. In the present case, in order to speed up the mold closing and improve the efficiency of the movable mold 12 and the fixed mold 13 of the press machine during the mold closing process, two auxiliary oil cylinders 15 are added. The two auxiliary oil cylinders 15 are plunger auxiliary cylinders, which together with the main oil cylinder 14 form a three-cylinder combination. Initially, the hydraulic unit 2 only needs to supply oil to the two auxiliary oil cylinders 15 to realize the forward movement of the entire movable mold 12. Due to the small volume of the auxiliary oil cylinder 15, the hydraulic unit 2 can realize the rapid extension action under the premise of unchanged oil output, so as to drive the movable mold 12 to the mold closing position. Figure 1As shown, at this time, the main oil cylinder 14 only needs to operate passively, so the main cylinder valve 25 selects the middle position and the return oil interconnection, that is, the main cylinder valve 25 performs the Y-type middle position function, and among the four oil ports (oil inlet P, oil outlet T, working oil port A, and working oil port B) of the main cylinder valve 25, the oil outlet T, the working oil port A, and the working oil port B are connected; in this way, when the two auxiliary oil cylinders 15 drive the main oil cylinder 14 and the movable mold 12 to perform a forward action, the main oil cylinder 14 can freely absorb oil, and after reaching the mold closing position, the two auxiliary oil cylinders 15 stop moving forward. At this time, a larger extreme high pressure is required for the final mold closing operation, so the main oil cylinder 14 is switched to continue moving forward to complete the mold closing. Furthermore, in order to realize intelligent and precise control, a PLC controller and a pressure sensor 27 are also included, and the pressure sensor 2 7 is connected to the oil outlet of the oil pump 22, the pressure sensor 27 is connected to the PLC controller through the circuit to monitor the pressure in the hydraulic oil circuit, the ejection valve 24, the main cylinder valve 25 and the auxiliary cylinder valve 26 are connected to the PLC controller; in this way, different pressure workpieces can be pressed below 200 bar. Furthermore, in order to achieve higher pressure pressing during pressing, that is, to achieve high-pressure output with low power, the main oil cylinder 14 is provided with a main chamber 141 and a sub-chamber 142, one working oil port of the main cylinder valve 25 is connected to the sub-chamber 142, and the other working oil port is connected to a diverter valve 251, two working oil ports of the diverter valve 251 are connected to the main chamber 141, and the oil return port of the diverter valve 251 is connected to the oil tank 23; the diverter valve 251 is connected to the PLC controller The oil circuit of the main cylinder valve 25 connected to the auxiliary chamber 142 is provided with a damper 252, one of the working oil ports of the diverter valve 251 is connected to the oil circuit of the main chamber 141 and is provided with a booster 253, and the other is provided with a pressure-maintaining valve 254; in this way, when a higher pressure is needed, the pressure sensor 27 receives the main hydraulic oil circuit information (i.e., it monitors that the hydraulic pressure of the main hydraulic oil circuit has reached 200 bar), and can feed back to the PLC controller to control the main cylinder valve 25 and the diverter valve 251. The pressure of the system oil acting on the main oil cylinder 14 can be increased from 200 bar to 450 bar through the booster 253, and the oil is supplied to the main oil cylinder 14 to complete the pressing work. Since the movable mold 12 is rigidly connected to the two auxiliary oil cylinders 15 and the main oil cylinder 14, When the main oil cylinder 14 moves forward, the auxiliary oil cylinder 15 needs to follow it, so the auxiliary cylinder valve 26 that controls the auxiliary oil cylinder 15 to move forward is a neutral position return oil (can self-priming oil to follow work), and finally after reaching the required pressure and pressure holding time, under the control of the PLC controller, the main oil cylinder 14 retreats (at this time the movable mold 12 drives the two auxiliary oil cylinders 15 to move back together), wherein the main oil cylinder 14 is provided with a main cavity 141 and a sub-cavity 142, wherein the main oil cylinder 14 is provided with a main cavity 141 and a sub-cavity 142, firstly, high-speed return can be achieved (the return oil during the retraction of the main oil cylinder 14 is a multiple ratio of the incoming oil, and a larger return oil area is required to realize rapid release of return oil), and secondly, when no pressurization is required, the maximum efficiency of pressing of workpieces of different pressures below 200 bar can be achieved, and then the ejection and retraction of the ejection cylinder 11 completes the unloading work in one time.

[0018] To sum up, during the mold closing process, since the two auxiliary cylinders 15 are mainly used to drive the main cylinder 14 and the movable mold 12 to perform forward movements during the first half of the forward movement, very high hydraulic oil pressure is not required, thereby reducing energy consumption. When boosting is required, the PLC controller controls the main cylinder valve 25 and the diverter valve 251, and the hydraulic oil pressure acting on the main cylinder 14 is increased through the booster 253, that is, a higher pressure output is achieved with lower power. At the same time, the servo motor 21 is used instead of the ordinary motor. During use, the PLC controller can be used in combination with the servo driver to accurately control the servo motor 21 to achieve the best energy consumption ratio. Compared with ordinary motors, the noise is also lower.

[0019] Preferably, a pressure switch valve 28 is provided between the oil outlet of the oil pump 22 and the oil tank 23, and the pressure switch valve 28 is a two-position three-way valve to ensure the safety of the hydraulic oil circuit during idling standby;

[0020] Preferably, a pressure relief protection valve 29 is further provided between the oil outlet of the oil pump 22 and the oil tank 23 to relieve pressure when the pressure of the hydraulic oil circuit reaches a set threshold value, so as to protect the safety of the oil circuit;

[0021] Embodiment 2: Different from Embodiment 1, it further includes a heat dissipation unit 3, which includes a heat dissipation motor 31 and a heat dissipation pump 32. The heat dissipation pump 32 is connected to the oil circuit of the oil tank 23 and a heat dissipation assembly 33 is provided. The heat dissipation assembly 33 includes a radiator 331 and a heat dissipation fan 332. The oil inlet of the radiator 331 is connected to the oil outlet of the heat dissipation pump 32. The oil outlet of the radiator 331 is connected to the oil tank 23. The heat dissipation motor 31 drives the heat dissipation pump 32 so that the hydraulic oil dissipates heat in the heat dissipation unit 3. When dissipating heat, the heat dissipation fan 332 rotates to cool the radiator 331. In this way, during operation, the hydraulic oil in the oil tank 23 is continuously circulated and cooled.

[0022] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. A hydraulic system for a horizontal high-pressure press, comprising a working unit (1) and a hydraulic unit (2), wherein the working unit (1) comprises a material ejection cylinder (11), and a movable die (12) and a fixed die (13) symmetrically arranged with respect to the ejection direction of the material ejection cylinder (11), a main cylinder (14) being arranged on the side of the movable die (12) facing away from the fixed die (13), and when the press is performing pressing and forming, the main cylinder (14) presses the movable die (12) toward the fixed die (13), characterized in that: The fixed die (13) is provided with two auxiliary oil cylinders (15) on both sides of the main oil cylinder (14); the hydraulic unit (2) comprises a servo motor (21), an oil pump (22) and an oil tank (23); the servo motor (21) drives the oil pump (22) to pump the hydraulic oil in the oil tank (23) through pipelines to the ejection oil cylinder (11), the main oil cylinder (14) and the two auxiliary oil cylinders (15); The hydraulic unit (2) further comprises a lifting valve (24), a main cylinder valve (25) and an auxiliary cylinder valve (26); the oil outlet of the oil pump (22) is respectively connected to the oil inlets of the lifting valve (24), the main cylinder valve (25) and the auxiliary cylinder valve (26); the oil outlets of the lifting valve (24), the main cylinder valve (25) and the auxiliary cylinder valve (26) are connected to the oil tank (23); the working oil ports of the lifting valve (24), the main cylinder valve (25) and the auxiliary cylinder valve (26) are respectively connected to the lifting cylinder (11), the main cylinder (14) and the two auxiliary cylinders (15).

2. A horizontal high-pressure press hydraulic system according to claim 1, characterized in that: It also includes a PLC controller and a pressure sensor (27), wherein the pressure sensor (27) is connected to the oil outlet of the oil pump (22), and the pressure sensor (27) is connected to the PLC controller through a circuit to monitor the pressure in the hydraulic oil circuit, and the ejection valve (24), the main cylinder valve (25) and the auxiliary cylinder valve (26) are connected to the PLC controller.

3. A horizontal high-pressure press hydraulic system according to claim 2, characterized in that: The master oil cylinder (14) is provided with a main chamber (141) and a secondary chamber (142); one working oil port of the master cylinder valve (25) is connected to the secondary chamber (142); the other working oil port is connected to a diverter valve (251); two working oil ports of the diverter valve (251) are connected to the main chamber (141); the oil return port of the diverter valve (251) is connected to the oil tank (23); and the diverter valve (251) is connected to the PLC controller.

4. A horizontal high-pressure press hydraulic system according to claim 3, characterized in that: The ejection valve (24) and the main cylinder valve (25) are three-position four-way solenoid valves, and the auxiliary cylinder valve (26) and the diverter valve (251) are two-position four-way solenoid valves.

5. A horizontal high-pressure press hydraulic system according to claim 3, characterized in that: A damper (252) is provided on the oil circuit connecting the master cylinder valve (25) to the auxiliary chamber (142), a pressure booster (253) is provided on the oil circuit connecting one of the working oil ports of the diverter valve (251) to the main chamber (141), and a pressure retaining valve (254) is provided on the other.

6. A horizontal high-pressure press hydraulic system according to claim 1, characterized in that: A pressure switch valve (28) is provided between the oil outlet of the oil pump (22) and the oil tank (23), and the pressure switch valve (28) is a two-position three-way valve to ensure the safety of the hydraulic oil circuit during idling standby.

7. A horizontal high-pressure press hydraulic system according to claim 1, characterized in that: A pressure relief protection valve (29) is also provided between the oil outlet of the oil pump (22) and the oil tank (23) to relieve pressure when the pressure of the hydraulic oil circuit reaches a set threshold, thereby protecting the safety of the oil circuit.

8. A horizontal high-pressure press hydraulic system according to claim 1, characterized in that: The invention also comprises a heat dissipation unit (3), the heat dissipation unit (3) comprising a heat dissipation motor (31) and a heat dissipation pump (32), the heat dissipation pump (32) being connected to the oil tank (23) and provided with a heat dissipation assembly (33), the heat dissipation assembly (33) comprising a radiator (331) and a heat dissipation fan (332), the oil inlet of the radiator (331) being connected to the oil outlet of the heat dissipation pump (32), the oil outlet of the radiator (331) being connected to the oil tank (23), the heat dissipation motor (31) driving the heat dissipation pump (32) so that the hydraulic oil dissipates heat in the heat dissipation unit (3), and when dissipating heat, the heat dissipation fan (332) rotates to cool the radiator (331).

Images