Four-column universal cartridge valve hydraulic machine control system

Abstract

The invention discloses a four-column universal cartridge valve hydraulic machine control system, and relates to the technical field of hydraulic control systems, the four-column universal cartridge valve hydraulic machine control system comprises a main cylinder and a top cylinder which are arranged up and down in a one-to-one correspondence manner, a top rod of the main cylinder is connected with an upper extrusion slide block, a top rod of the top cylinder is provided with a pressing platform, and a workpiece is placed on the pressing platform; the extrusion sliding block and the downward pressing platform are arranged on the four guide columns in a sliding mode. Plug cavities of the main cylinder and the top cylinder are communicated with plug cavity working oil ways, rod cavities of the main cylinder and the top cylinder are communicated with rod cavity working oil ways, plug-in mounting direction valve assemblies are arranged on the plug cavity working oil ways, and plug-in mounting direction valve assemblies are arranged on the rod cavity working oil ways. According to the hydraulic control system specially matched with the double-cylinder hydraulic machine for use, the cartridge valves are adopted, the structure is simple, the flow is large, the suitability is high, the cost is low, the response speed is high, opening and closing actions can be completed within a short time, the sealing performance is good, leakage is little, the pressure loss of oil liquid is small, the reliability and stability of the system are ensured, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic control systems, in particular to a four-column universal cartridge valve hydraulic press control system. Background Art

[0002] Four-column hydraulic press is a kind of mechanical equipment that uses the pressure generated by the hydraulic system to work. It is widely used in the processing of metal, plastic, rubber, wood, powder and other products. It can realize the processes of stretching, bending, flanging, cold machine, and punching of metal materials. Its main component is the hydraulic control system. Through the hydraulic oil as the working medium, the hydraulic energy is converted into mechanical energy to realize the circulation of various process actions. The existing hydraulic press adopts a slide valve structure with small flow, low pressure, low precision, poor reliability, and great difficulty in maintenance. Summary of the invention

[0003] The purpose of the present invention is to provide a four-column universal cartridge valve hydraulic press control system to solve the problems existing in the above-mentioned prior art, so that the structure is simple, the flow rate is large, the response speed is fast, the switching action can be completed in a short time, the pressure loss of the oil is small, and the reliability, stability and production efficiency of the system are improved.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a four-column universal cartridge valve hydraulic press control system, comprising a main cylinder and a top cylinder arranged one by one in an upper and a lower direction, wherein the top rod of the main cylinder is connected with an upper extrusion slider, the top rod of the top cylinder is provided with a lower pressure platform, a workpiece is placed on the lower pressure platform, and the extrusion slider and the lower pressure platform are both slidably arranged on four guide columns;

[0006] The plug chamber of the master cylinder is connected to a master cylinder plug chamber working oil circuit, and the rod chamber is connected to a master cylinder rod chamber working oil circuit. A first plug-in directional valve assembly is provided on the master cylinder plug chamber working oil circuit, and a second plug-in directional valve assembly is provided on the master cylinder rod chamber working oil circuit.

[0007] The plug chamber of the top cylinder is connected with a top cylinder plug chamber working oil circuit, and the rod chamber is connected with a top cylinder rod chamber working oil circuit. A third plug-in directional valve assembly is provided on the top cylinder plug chamber working oil circuit, and a fourth plug-in directional valve assembly is provided on the top cylinder rod chamber working oil circuit.

[0008] The oil pump oil circuit includes a main oil inlet oil circuit and a main oil return oil circuit connected to the oil tank, an oil pump is arranged on the main oil inlet oil circuit, the main cylinder plug chamber working oil circuit, the main cylinder rod chamber working oil circuit, the top cylinder plug chamber working oil circuit and the top cylinder rod chamber working oil circuit are all connected to the main oil inlet oil circuit; the first cartridge directional valve assembly is connected to the main oil return oil circuit through the first cartridge pressure valve assembly, the second cartridge directional valve assembly is connected to the main oil return oil circuit through the second cartridge pressure valve assembly, the third cartridge directional valve assembly is connected to the main oil return oil circuit through the third cartridge pressure valve assembly, the fourth cartridge directional valve assembly is connected to the main oil return oil circuit through the fourth cartridge pressure valve assembly, and the first cartridge pressure valve assembly, the first cartridge pressure valve assembly and the fourth cartridge pressure valve assembly are all provided with remote control overflow valves.

[0009] Preferably, the first cartridge directional valve assembly includes a two-position four-way solenoid valve, a cartridge check valve and a one-way opening solenoid cartridge directional valve, the P port of the two-position four-way solenoid valve is connected to the main oil inlet circuit, the T port is connected to the first cartridge pressure valve assembly, and the A port is connected through the control port of the one-way opening solenoid cartridge directional valve, the inlet of the one-way opening solenoid cartridge directional valve is connected to both the main oil inlet circuit and the first cartridge pressure valve assembly, and the outlet is connected to the plug chamber of the master cylinder through a cartridge check valve, and the other outlet of the one-way opening solenoid cartridge directional valve is connected in sequence to a pressure relay and a relief valve; the pressure gauge, the remote control relief valve and the pressure relay are all connected to a remote control center in communication, and a pressure gauge is arranged between the one-way opening solenoid cartridge directional valve and the first cartridge pressure valve assembly.

[0010] Preferably, the first cartridge pressure valve assembly comprises a one-way opening electromagnetic cartridge pressure valve, a low-pressure relief valve, a high-pressure relief valve and an H-type three-position four-way electromagnetic valve, the inlet of the one-way opening electromagnetic cartridge pressure valve is respectively connected to the low-pressure relief valve, the high-pressure relief valve and the P port of the H-type three-position four-way electromagnetic valve, the low-pressure relief valve is connected to the high-pressure relief valve, the T port of the H-type three-position four-way electromagnetic valve is connected to the low-pressure relief valve, the low-pressure relief valve and the high-pressure relief valve are connected to the H-type three-position four-way electromagnetic valve. The P port of the three-position four-way solenoid valve is connected, and the outlet of the one-way opening electromagnetic cartridge pressure valve, the low-pressure relief valve, the high-pressure relief valve and the B port of the H-type three-position four-way solenoid valve are all connected to the main return oil circuit; the pipeline between the control port of the one-way opening electromagnetic cartridge pressure valve and the P port of the H-type three-position four-way solenoid valve is respectively connected to the low-pressure relief valve and the high-pressure relief valve and a remote-controlled relief valve is provided; the pressure control range of the high-pressure relief valve is 30MPa-40MPa.

[0011] Preferably, the second cartridge directional valve assembly includes a two-position four-way solenoid valve, a shuttle valve and a one-way opening solenoid cartridge directional valve, the T port of the two-position four-way solenoid valve is connected to the main oil inlet circuit, the P port is connected to the second cartridge pressure valve assembly, the A port is connected through the shuttle valve and the control port of the one-way opening solenoid cartridge directional valve, the inlet of the one-way opening solenoid cartridge directional valve is connected to the main oil inlet circuit, and the outlet is connected to the rod chamber of the master cylinder and the second cartridge pressure valve assembly respectively.

[0012] Preferably, the second cartridge pressure valve assembly includes a one-way opening electromagnetic cartridge pressure valve, a low-pressure relief valve, a high-pressure relief valve and an O-type three-position four-way electromagnetic valve, the control port of the one-way opening electromagnetic cartridge pressure valve is respectively connected to the low-pressure relief valve, the high-pressure relief valve and the P port of the O-type three-position four-way electromagnetic valve, the low-pressure relief valve is connected to the high-pressure relief valve, the T port of the O-type three-position four-way electromagnetic valve is connected to the low-pressure relief valve, the low-pressure relief valve and the high-pressure relief valve are connected to the A port of the O-type three-position four-way electromagnetic valve, and the low-pressure relief valve, the high-pressure relief valve and the B port of the O-type three-position four-way electromagnetic valve are all connected to the main return oil circuit; the pipeline between the control port of the one-way opening electromagnetic cartridge pressure valve and the P port of the O-type three-position four-way electromagnetic valve is respectively connected to the low-pressure relief valve and the high-pressure relief valve.

[0013] Preferably, the third cartridge directional valve assembly includes a J-type three-position four-way solenoid valve, a one-way valve and a one-way opening solenoid cartridge directional valve, the P port of the J-type three-position four-way solenoid valve is connected to the main return oil circuit, the T port is connected to the main oil inlet oil circuit through the one-way valve, the A port is connected to the overflow valve of the third cartridge pressure valve assembly through a one-way valve, the B port is connected to the control port of the one-way opening solenoid cartridge directional valve, the outlet of the one-way opening solenoid cartridge directional valve is connected to the top cylinder rod chamber working oil circuit, and the inlet is connected to the main oil inlet oil circuit.

[0014] Preferably, the third cartridge pressure valve assembly includes a one-way opening electromagnetic cartridge pressure valve and a relief valve, the inlet of the one-way opening electromagnetic cartridge pressure valve is connected to the working oil circuit of the top cylinder rod chamber, the outlet is connected to the main return oil circuit, the outlet and the control port are connected through the relief valve, and a one-way valve is arranged on the working oil circuit of the top cylinder rod chamber.

[0015] Preferably, the fourth cartridge directional valve assembly includes a shuttle valve and a one-way opening electromagnetic cartridge directional valve, the inlet of the one-way opening electromagnetic cartridge directional valve is connected to the main oil inlet circuit, the control port is connected to the middle port of the shuttle valve, and the outlet is respectively connected to the top cylinder plug chamber working oil circuit and the side port of the shuttle valve, and the other side port of the shuttle valve is connected to the pipeline connecting the A port of the J-type three-position four-way solenoid valve in the third cartridge directional valve assembly and the overflow valve in the third cartridge pressure valve assembly.

[0016] Preferably, the fourth cartridge pressure valve assembly includes a one-way opening electromagnetic cartridge pressure valve and a relief valve, the inlet of the one-way opening electromagnetic cartridge pressure valve is connected to the working oil circuit of the top cylinder plug chamber, the control port is connected to the outlet through the relief valve, and the outlet is connected to the main return oil circuit, the control port of the one-way opening electromagnetic cartridge pressure valve is connected to a remote-controlled relief valve, and the pipeline connecting the B port of the J-type three-position four-way solenoid valve in the third cartridge directional valve assembly and the control port of the one-way opening electromagnetic cartridge directional valve is connected to the relief valve through a three-way and a one-way valve.

[0017] Preferably, a pressure gauge and a cartridge one-way valve are provided on the working oil circuit of the master cylinder plug chamber, the cartridge one-way valve is connected to the oil tank and is used to replenish oil to the plug chamber of the master cylinder, and a pressure gauge is provided on the working oil circuit of the top cylinder plug chamber; the cartridge one-way valve is connected to the main oil inlet circuit through a one-two-position four-way solenoid valve.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] The integrated system of the present invention is a hydraulic control system specially designed for use with a twin-cylinder hydraulic press. It realizes electro-hydraulic control in combination with electrical control and is optimized for the working characteristics of the hydraulic press. It is suitable for a twin-cylinder hydraulic press with deadweight, a rapid sliding system and long-term pressure maintenance requirements. It adopts a cartridge valve with a simple structure, large flow, strong suitability, low cost, fast response speed, and can complete the switching action in a short time. It has good sealing, less leakage, and small oil pressure loss, which ensures the reliability and stability of the system and greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the principle of the control system of the four-column universal cartridge valve hydraulic press in the embodiment of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a four-column universal cartridge valve hydraulic press control system in an embodiment of the present invention;

[0023] Figure 3 It is a schematic diagram of the integrated structure of the four-column universal cartridge valve in the embodiment of the present invention;

[0024] Figure 4Schematic diagram of the action sequence of each valve solenoid in the embodiment of the present invention;

[0025] In the figure: 1-main cylinder, 2-top cylinder, 3-extrusion slide, 4-down pressure platform, 5-guide column, 6-workpiece, 7-oil tank, 8-limit switch, 9-relief valve, 10-pressure gauge, 11-remote control relief valve, 12-H type three-position four-way solenoid valve, 13-low-pressure relief valve, 14-high-pressure relief valve, 15-O type three-position four-way solenoid valve, 16-J type three-position four-way solenoid valve, 17-main oil inlet oil circuit, 18-main oil return oil circuit, 19-shuttle valve, 20-oil pump, 21-pressure relay; D1-D4 are one-way valves; A1-A2 are one-way cartridge valves; F1-F3 are two-position four-way solenoid valves; K1-K4 are one-way opening solenoid cartridge directional valves; Y1-Y4 are one-way opening solenoid cartridge pressure valves, and YV1-YV9 are solenoid valve switches. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The purpose of the present invention is to provide a four-column universal cartridge valve hydraulic press control system to solve the problems existing in the prior art, so that the structure is simple, the flow rate is large, the response speed is fast, the switching action can be completed in a short time, the pressure loss of the oil is small, and the reliability, stability and production efficiency of the system are improved.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Embodiment 1

[0030] like Figures 1 to 4 As shown, in this embodiment, a four-column universal cartridge valve hydraulic press control system is provided, including a main cylinder 1 and a top cylinder 2 arranged one by one in the upper and lower directions, the top rod of the main cylinder 1 is connected to an upper extrusion slider 3, the top rod of the top cylinder 2 is provided with a downward pressure platform 4, a workpiece 6 is placed on the downward pressure platform 4, the extrusion slider 3 and the downward pressure platform 4 are both slidably arranged on four guide columns 5; four limit switches 8 are arranged on the frame, the extrusion slider 3 and the downward pressure platform 4 correspond to two limit switches 8 respectively, and the limit switches 8 correspond to the highest stroke and the lowest stroke of the extrusion slider 3 and the highest stroke and the lowest stroke of the downward pressure platform 4 respectively, so as to realize automatic limit.

[0031] The plug chamber of the master cylinder 1 is connected to the master cylinder plug chamber working oil circuit, and the rod chamber is connected to the master cylinder rod chamber working oil circuit. The master cylinder plug chamber working oil circuit is provided with a first cartridge directional valve assembly, and the master cylinder rod chamber working oil circuit is provided with a second cartridge directional valve assembly;

[0032] The plug chamber of the top cylinder 2 is connected with a top cylinder plug chamber working oil circuit, and the rod chamber is connected with a top cylinder rod chamber working oil circuit. A third cartridge directional valve assembly is arranged on the top cylinder plug chamber working oil circuit, and a fourth cartridge directional valve assembly is arranged on the top cylinder rod chamber working oil circuit.

[0033] The oil pump oil circuit includes a main oil inlet oil circuit 17 and a main oil return oil circuit 18 connected to the oil tank 7. An oil pump 20 is arranged on the main oil inlet oil circuit 17. The main cylinder plug chamber working oil circuit, the main cylinder rod chamber working oil circuit, the top cylinder plug chamber working oil circuit and the top cylinder rod chamber working oil circuit are all connected to the main oil inlet oil circuit 17; the first cartridge directional valve assembly is connected to the main oil return oil circuit 18 through the first cartridge pressure valve assembly, the second cartridge directional valve assembly is connected to the main oil return oil circuit 18 through the second cartridge pressure valve assembly, the third cartridge directional valve assembly is connected to the main oil return oil circuit 18 through the third cartridge pressure valve assembly, and the fourth cartridge directional valve assembly is connected to the main oil return oil circuit 18 through the fourth cartridge pressure valve assembly. The first cartridge pressure valve assembly, the first cartridge pressure valve assembly and the fourth cartridge pressure valve assembly are all provided with a remote control overflow valve 11.

[0034] As an optional solution, in this embodiment, the first cartridge directional valve assembly includes a two-position four-way solenoid valve F2, a cartridge check valve A2 and a one-way opening solenoid cartridge directional valve K1. The P port of the two-position four-way solenoid valve F2 is connected to the main oil inlet oil circuit 17, the T port is connected to the first cartridge pressure valve assembly, and the A port is connected through the control port of the one-way opening solenoid cartridge directional valve K1. The inlet of the one-way opening solenoid cartridge directional valve K1 is connected to both the main oil inlet oil circuit 17 and the first cartridge pressure valve assembly, and the outlet is connected to the plug chamber of the master cylinder 1 through a cartridge check valve A2. The other outlet of the one-way opening solenoid cartridge directional valve K1 is connected in sequence with a pressure relay 21 and a relief valve 9; the pressure gauge, the remote control relief valve 11 and the pressure relay 21 are all connected to a remote control center for communication, and a pressure gauge is arranged between the open solenoid cartridge directional valve and the first cartridge pressure valve assembly. Among them, the remote control relief valve 11 controls the pressure of the hydraulic system, and the pressure relay 21 is a pressure feedback switch.

[0035] As an optional solution, the first cartridge pressure valve assembly in this embodiment includes a one-way opening electromagnetic cartridge pressure valve Y1, a low-pressure relief valve 13, a high-pressure relief valve 14 and an H-type three-position four-way electromagnetic valve 12. The inlet of the one-way opening electromagnetic cartridge pressure valve Y1 is respectively connected to the low-pressure relief valve 13, the high-pressure relief valve 14 and the P port of the H-type three-position four-way electromagnetic valve 12, the low-pressure relief valve 13 is connected to the high-pressure relief valve 14, the T port of the H-type three-position four-way electromagnetic valve 12 is connected to the low-pressure relief valve 13, and the low-pressure relief valve 13 and the high-pressure relief valve 14 is connected to the P port of the H-type three-position four-way solenoid valve 12, and the outlet of the one-way opening solenoid cartridge pressure valve Y1, the low-pressure relief valve 13, the high-pressure relief valve 14 and the B port of the H-type three-position four-way solenoid valve 12 are all connected to the main return oil circuit 18; the pipeline between the control port of the one-way opening solenoid cartridge pressure valve Y1 and the P port of the H-type three-position four-way solenoid valve 12 is respectively connected to the low-pressure relief valve 13 and the high-pressure relief valve 14 and is provided with a remote control relief valve 11; the pressure control range of the high-pressure relief valve 14 is 30MPa-40MPa. Among them, the low-pressure relief valve 13 is the pressure of the filling valve control port, and the high-pressure relief valve 14 controls the pressure of the entire main oil circuit system.

[0036] As an optional solution, in this embodiment, the second cartridge directional valve assembly includes a two-position four-way solenoid valve F3, a shuttle valve 19 and a one-way opening solenoid cartridge directional valve K2, the T port of the two-position four-way solenoid valve F3 is connected to the main oil inlet oil circuit 17, the P port is connected to the second cartridge pressure valve assembly, the A port is connected to the control port of the one-way opening solenoid cartridge directional valve K2 through the shuttle valve 19, the inlet of the one-way opening solenoid cartridge directional valve K2 is connected to the main oil inlet oil circuit 17, and the outlet is connected to the rod chamber of the master cylinder 1 and the second cartridge pressure valve assembly respectively. Among them, the second cartridge directional valve assembly is opposite to the two-position four-way solenoid valve in the first cartridge directional valve assembly.

[0037] As an optional solution, the second cartridge pressure valve assembly in this embodiment includes a one-way opening electromagnetic cartridge pressure valve Y2, a low-pressure relief valve 13, a high-pressure relief valve 14 and an O-type three-position four-way electromagnetic valve 15. The control port of the one-way opening electromagnetic cartridge pressure valve Y2 is respectively connected to the P port of the low-pressure relief valve 13, the high-pressure relief valve 14 and the O-type three-position four-way electromagnetic valve 15, the low-pressure relief valve 13 is connected to the high-pressure relief valve 14, the T port of the O-type three-position four-way electromagnetic valve 15 is connected to the low-pressure relief valve 13, the low-pressure relief valve 13 and the high-pressure relief valve 14 are connected to the A port of the O-type three-position four-way electromagnetic valve 15, and the B port of the low-pressure relief valve 13, the high-pressure relief valve 14 and the O-type three-position four-way electromagnetic valve 15 are all connected to the main return oil circuit 18; the pipeline between the control port of the one-way opening electromagnetic cartridge pressure valve Y2 and the P port of the O-type three-position four-way electromagnetic valve 15 is respectively connected to the low-pressure relief valve 13 and the high-pressure relief valve 14.

[0038] As an optional scheme, the third cartridge directional valve assembly in this embodiment includes a J-type three-position four-way solenoid valve 16, a one-way valve D1 and a one-way opening solenoid cartridge directional valve K3. The P port of the J-type three-position four-way solenoid valve 16 is connected to the main return oil circuit 18, the T port is connected to the main oil inlet oil circuit 17 through the one-way valve D1, the A port is connected to the overflow valve 9 of the third cartridge pressure valve assembly through a one-way valve D2, and the B port is connected to the control port of the one-way opening solenoid cartridge directional valve K3. The outlet of the one-way opening solenoid cartridge directional valve K3 is connected to the working oil circuit of the top cylinder rod chamber, and the inlet is connected to the main oil inlet oil circuit 17. The side port of the one-way opening solenoid cartridge directional valve K3 is connected to the working oil circuit of the top cylinder rod chamber, and the inlet is connected to the main oil inlet oil circuit 17.

[0039] As an optional solution, the third cartridge pressure valve assembly in this embodiment includes a one-way opening electromagnetic cartridge pressure valve Y3 and a relief valve 9, the inlet of the one-way opening electromagnetic cartridge pressure valve Y3 is connected to the working oil circuit of the top cylinder rod chamber, the outlet is connected to the main return oil circuit 18, the outlet and the control port are connected through the relief valve 9, and a one-way valve D3 is arranged on the working oil circuit of the top cylinder rod chamber. Among them, the relief valve 9 can limit the maximum pressure of the top cylinder 2 rod chamber.

[0040] As an optional solution, the fourth cartridge directional valve assembly in this embodiment includes a shuttle valve 19 and a one-way opening electromagnetic cartridge directional valve K4, the inlet of the one-way opening electromagnetic cartridge directional valve K4 is connected to the main oil inlet oil circuit 17, the control port is connected to the middle port of the shuttle valve 19, and the outlet is respectively connected to the working oil circuit of the top cylinder plug chamber and the side port of the shuttle valve 19, and the other side port of the shuttle valve 19 is connected to the A port of the J-type three-position four-way electromagnetic valve 16 in the third cartridge directional valve assembly and the pipeline connected to the overflow valve 9 in the third cartridge pressure valve assembly. In this embodiment, the shuttle valve 19 can lock the oil in the plug chamber of the top cylinder 2 to maintain pressure and will not be opened in the reverse direction.

[0041] As an optional solution, the fourth cartridge pressure valve assembly in this embodiment includes a one-way opening electromagnetic cartridge pressure valve Y4 and a relief valve 9, the inlet of the one-way opening electromagnetic cartridge pressure valve Y4 is connected to the working oil circuit of the top cylinder plug chamber, the control port is connected to the outlet through the relief valve 9, and the outlet is connected to the main return oil circuit 18, the control port of the one-way opening electromagnetic cartridge pressure valve Y4 is connected to a remote control relief valve 11, and the B port of the J-type three-position four-way electromagnetic valve 16 in the third cartridge directional valve assembly is connected to the one-way opening electromagnetic cartridge directional valve K4 control port on the pipeline connected to the relief valve 9 through a three-way and one-way valve D4. In this embodiment, a J-type three-position four-way electromagnetic valve 16 can be used to simultaneously control the plug chamber and rod chamber of the top cylinder 2 to achieve interlocking.

[0042] As an optional solution, in this embodiment, a pressure gauge and a plug-in one-way valve A1 are provided on the working oil circuit of the master cylinder plug chamber. The plug-in one-way valve is connected to the oil tank 7 and is used to replenish oil to the plug chamber of the master cylinder 1. A pressure gauge is provided on the working oil circuit of the plug chamber of the top cylinder 2; the plug-in one-way valve A1 is connected to the main oil inlet circuit 17 through a one-two-position four-way solenoid valve F1.

[0043] In this embodiment, each one-way opening electromagnetic cartridge directional valve mainly includes an insert component, a pilot control component, a control cover and a cartridge valve body. The insert component is arranged in the cartridge valve body. The control cover is connected to the cartridge valve body and is provided with a control flow channel. The pilot control component is connected to the insert component through the control flow channel. The cartridge valve body is also provided with an oil inlet channel and an oil outlet channel connected to the insert component.

[0044] (1) Insert element: It is the main stage or power element of the two-way cartridge valve. It is inserted in the valve body or integrated block. It controls the on-off of the liquid flow, the level of pressure and the size of the flow through its opening and closing action and the size of the opening amount, that is, it realizes the control of the direction, pressure and speed of the actuator.

[0045] (2) Pilot control element: The switch of the inserted element is controlled by the pilot control part. There are many types of pilot control elements, including solenoid reversing valves for controlling direction, pressure regulating valves for controlling pressure, sequence valves, unloading valves, pressure reducing valves, and adjusting screws for controlling flow.

[0046] (3) Control cover: It not only covers the fixed insertion element, but also acts as a bridge between the connecting rod insertion element and the pilot element. More importantly, it itself has various control functions. Together with the pilot element, it constitutes the pilot part.

[0047] (4) Cartridge valve body: It is processed with installation holes and various flow channels for inserting components and control cover plates. According to the working requirements, a type of inserting component is selected, matched with the corresponding pilot component and control cover plate, and a hydraulic control system that meets the working conditions can be assembled.

[0048] Embodiment 2

[0049] This embodiment provides a specific working process of a four-column universal cartridge valve hydraulic press control system:

[0050] ⑴ Master cylinder 1 moves down quickly: before moving down quickly, the oil pump 20 starts. At this time, the solenoid valve at YV1 / YV2 is in the middle position, the pressure valve plug at Y1 is in the unloading state, and the hydraulic pump is in the idle standby state. To make the master cylinder 1 move down quickly, YV2 is energized, the high-pressure pilot of the pressure valve at Y1 starts to pressurize, the pressure valve at Y1 is closed, and the system generates pressurized oil. YV5 is energized, the directional valve plug at K1 opens, and the system high-pressure oil flows through the directional valve at K1, through the one-way cartridge valve at A2, and enters the plug chamber of the master cylinder 1; YV4 is energized, the pressure valve at Y2 opens, and the rod chamber oil of the master cylinder 1 flows back to the oil tank 7 through the pressure valve at Y2. At this time, the rod chamber of the master cylinder 1 has no supporting force on the entire extrusion slider 3 (no back pressure), and the extrusion slider 3 is under the action of its own weight.

[0051] It moves downward rapidly. At this time, the oil flowing into the plug chamber of the master cylinder 1 through the directional valve at K1 is far from meeting the demand for oil volume in the upper chamber of the master cylinder. A vacuum is formed in the plug chamber of the master cylinder 1. Under the action of negative pressure, the valve core of the one-way cartridge valve A1 (filling valve) is sucked open, and a large amount of hydraulic oil is replenished from the oil tank 7 to the plug chamber of the master cylinder 1 through the filling valve, thereby realizing the rapid downward movement of the master cylinder 1.

[0052] (2) Master cylinder 1 moves down slowly and pressurizes: Master cylinder 1 moves down to the position close to top cylinder 2. Under the grating induction, the signaling element sends out a command, YV4 is powered off, and YV3 is powered on. At this time, YV2 and YV5 remain powered. After YV3 is powered, the rod chamber of master cylinder 1 generates back pressure, which supports the extrusion slider 3 on master cylinder 1. Master cylinder 1 slows down and moves down, and then contacts workpiece 6 to press the product. During the process of master cylinder 1 moving down slowly and pressurizing, the high-pressure oil of the system passes through the directional valve at K1, flows through the one-way cartridge valve at A2, and enters the plug chamber of master cylinder 1. The oil in the rod chamber of master cylinder 1 overflows and is discharged through the directional valve at Y2. Under the pressure of the plug chamber of master cylinder 1, the valve core of one-way cartridge valve A1 is closed.

[0053] ⑶ Maintaining pressure of main cylinder 1: After the product is pressed, all solenoid valves are powered off and main cylinder 1 enters the pressure maintaining state until the pressure maintaining time required by the process.

[0054] ⑷ Pressure relief of master cylinder 1: When YV1 is energized, the system runs at low pressure; when YV9 is energized, the system high-pressure oil enters the control port of the one-way cartridge valve A1 through the YV9 solenoid valve, so that the one-way cartridge valve A1 opens and the plug chamber of the master cylinder 1 is depressurized; when the one-way cartridge valve A1 is depressurized, it is generally necessary to pre-release first. You can choose a one-way cartridge valve A1 with a pre-release function or set a pre-release valve in the plug chamber of the master cylinder 1.

[0055] ⑸ Return stroke of master cylinder: YV2 is energized, and the system operates at high pressure; YV6 is energized, and the system high-pressure oil flows into the rod chamber of master cylinder 1 through K2; YV9 is energized, and the filling valve opens, and the oil in the plug chamber of master cylinder 1 flows back to oil tank 7 through the filling valve, thereby realizing the rapid return stroke of master cylinder 1.

[0056] (6) Ejection of top cylinder 2: After the main cylinder 1 returns to the top contact switch, the main cylinder 1 stops running. YV2 is energized, and the system runs at high pressure; YV7 is energized, oil enters the plug chamber of top cylinder 2, the directional valve at K4 opens, and the pressure valve at Y3 connected to the rod chamber of top cylinder 2 releases oil; the system high-pressure oil flows into the plug chamber of top cylinder 2 from the directional valve at K4, and the oil in the rod chamber of top cylinder 2 flows back to the oil tank 7 from the pressure valve at Y3, realizing the ejection action of top cylinder 2, and the lower pressure platform 4 moves up to eject the pressed workpiece 6 product, making it convenient for workers to take it.

[0057] ⑺The top cylinder 2 retracts: YV2 remains energized, YV7 loses power, and YV8 is energized; the directional valve at K3 and the pressure valve at Y4 are opened; the system high-pressure oil flows into the rod chamber of the top cylinder 2 through the directional valve at K3, and the oil in the plug chamber of the top cylinder 2 flows back to the oil tank 7 through the pressure valve at Y4, realizing the retraction action of the top cylinder 2.

[0058] Conventional hydraulic presses have two action modes that can be switched: ejection action and stretching action. The ejection action is that the main cylinder presses first, and then the ejection cylinder pushes out. It is mainly used for the pressing and forming of various profiles, blanking and other processes. The stretching action is mainly used for the pressing process of stretching metal sheets, and the ejection of the top cylinder is the initial state.

[0059] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A four-column universal cartridge valve hydraulic press control system, characterized in that: It comprises a main cylinder and a top cylinder which are arranged one by one in the upper and lower parts, the top rod of the main cylinder is connected with an upper extrusion slider, the top rod of the top cylinder is provided with a downward pressing platform, a workpiece is placed on the downward pressing platform, and the extrusion slider and the downward pressing platform are both slidably arranged on four guide columns; The plug chamber of the master cylinder is connected to a master cylinder plug chamber working oil circuit, and the rod chamber is connected to a master cylinder rod chamber working oil circuit. A first plug-in directional valve assembly is provided on the master cylinder plug chamber working oil circuit, and a second plug-in directional valve assembly is provided on the master cylinder rod chamber working oil circuit. The plug chamber of the top cylinder is connected with a top cylinder plug chamber working oil circuit, and the rod chamber is connected with a top cylinder rod chamber working oil circuit. A third plug-in directional valve assembly is provided on the top cylinder plug chamber working oil circuit, and a fourth plug-in directional valve assembly is provided on the top cylinder rod chamber working oil circuit. The oil pump oil circuit includes a main oil inlet oil circuit and a main oil return oil circuit connected to the oil tank, an oil pump is arranged on the main oil inlet oil circuit, the main cylinder plug chamber working oil circuit, the main cylinder rod chamber working oil circuit, the top cylinder plug chamber working oil circuit and the top cylinder rod chamber working oil circuit are all connected to the main oil inlet oil circuit; the first cartridge directional valve assembly is connected to the main oil return oil circuit through the first cartridge pressure valve assembly, the second cartridge directional valve assembly is connected to the main oil return oil circuit through the second cartridge pressure valve assembly, the third cartridge directional valve assembly is connected to the main oil return oil circuit through the third cartridge pressure valve assembly, the fourth cartridge directional valve assembly is connected to the main oil return oil circuit through the fourth cartridge pressure valve assembly, and the first cartridge pressure valve assembly, the first cartridge pressure valve assembly and the fourth cartridge pressure valve assembly are all provided with remote control overflow valves.

2. The four-column universal cartridge valve hydraulic press control system according to claim 1 is characterized in that: The first cartridge directional valve assembly includes a two-position four-way solenoid valve, a cartridge check valve and a one-way opening solenoid cartridge directional valve. The P port of the two-position four-way solenoid valve is connected to the main oil inlet circuit, the T port is connected to the first cartridge pressure valve assembly, and the A port is connected through the control port of the one-way opening solenoid cartridge directional valve. The inlet of the one-way opening solenoid cartridge directional valve is connected to both the main oil inlet circuit and the first cartridge pressure valve assembly, and the outlet is connected to the plug chamber of the master cylinder through a cartridge check valve. A pressure relay and a relief valve are connected to the other outlet of the one-way opening solenoid cartridge directional valve in sequence; the pressure gauge, the remote control relief valve and the pressure relay are all connected to a remote control center for communication, and a pressure gauge is arranged between the one-way opening solenoid cartridge directional valve and the first cartridge pressure valve assembly.

3. The four-column universal cartridge valve hydraulic press control system according to claim 1 is characterized in that: The first cartridge pressure valve assembly includes a one-way opening electromagnetic cartridge pressure valve, a low-pressure relief valve, a high-pressure relief valve and an H-type three-position four-way electromagnetic valve. The inlet of the one-way opening electromagnetic cartridge pressure valve is respectively connected to the low-pressure relief valve, the high-pressure relief valve and the P port of the H-type three-position four-way electromagnetic valve, the low-pressure relief valve is connected to the high-pressure relief valve, the T port of the H-type three-position four-way electromagnetic valve is connected to the low-pressure relief valve, the low-pressure relief valve and the high-pressure relief valve are connected to the H-type three-position four-way electromagnetic valve. The P port of the four-way solenoid valve is connected, and the outlet of the one-way opening solenoid cartridge pressure valve, the low-pressure relief valve, the high-pressure relief valve and the B port of the H-type three-position four-way solenoid valve are all connected to the main return oil circuit; the pipeline between the control port of the one-way opening solenoid cartridge pressure valve and the P port of the H-type three-position four-way solenoid valve is respectively connected to the low-pressure relief valve and the high-pressure relief valve and a remote-controlled relief valve is provided; the pressure control range of the high-pressure relief valve is 30MPa-40MPa.

4. The four-column universal cartridge valve hydraulic press control system according to claim 1, characterized in that: The second cartridge directional valve assembly includes a two-position four-way solenoid valve, a shuttle valve and a one-way opening solenoid cartridge directional valve. The T port of the two-position four-way solenoid valve is connected to the main oil inlet circuit, the P port is connected to the second cartridge pressure valve assembly, and the A port is connected to the control port of the one-way opening solenoid cartridge directional valve through the shuttle valve. The inlet of the one-way opening solenoid cartridge directional valve is connected to the main oil inlet circuit, and the outlet is connected to the rod chamber of the master cylinder and the second cartridge pressure valve assembly respectively.

5. The four-column universal cartridge valve hydraulic press control system according to claim 1, characterized in that: The second cartridge pressure valve assembly includes a one-way opening electromagnetic cartridge pressure valve, a low-pressure relief valve, a high-pressure relief valve and an O-type three-position four-way electromagnetic valve. The control port of the one-way opening electromagnetic cartridge pressure valve is respectively connected to the low-pressure relief valve, the high-pressure relief valve and the P port of the O-type three-position four-way electromagnetic valve, the low-pressure relief valve is connected to the high-pressure relief valve, the T port of the O-type three-position four-way electromagnetic valve is connected to the low-pressure relief valve, the low-pressure relief valve and the high-pressure relief valve are connected to the A port of the O-type three-position four-way electromagnetic valve, and the B port of the low-pressure relief valve, the high-pressure relief valve and the O-type three-position four-way electromagnetic valve are all connected to the main return oil circuit; the pipeline between the control port of the one-way opening electromagnetic cartridge pressure valve and the P port of the O-type three-position four-way electromagnetic valve is respectively connected to the low-pressure relief valve and the high-pressure relief valve.

6. The four-column universal cartridge valve hydraulic press control system according to claim 1, characterized in that: The third cartridge directional valve assembly includes a J-type three-position four-way solenoid valve, a one-way valve and a one-way opening solenoid cartridge directional valve. The P port of the J-type three-position four-way solenoid valve is connected to the main return oil circuit, the T port is connected to the main oil inlet oil circuit through the one-way valve, the A port is connected to the overflow valve of the third cartridge pressure valve assembly through a one-way valve, the B port is connected to the control port of the one-way opening solenoid cartridge directional valve, the outlet of the one-way opening solenoid cartridge directional valve is connected to the working oil circuit of the top cylinder rod chamber, and the inlet is connected to the main oil inlet oil circuit.

7. The four-column universal cartridge valve hydraulic press control system according to claim 1, characterized in that: The third cartridge pressure valve assembly includes a one-way opening electromagnetic cartridge pressure valve and a relief valve, the inlet of the one-way opening electromagnetic cartridge pressure valve is connected to the working oil circuit of the top cylinder rod chamber, the outlet is connected to the main return oil circuit, the outlet and the control port are connected through the relief valve, and a one-way valve is arranged on the working oil circuit of the top cylinder rod chamber.

8. The four-column universal cartridge valve hydraulic press control system according to claim 1, characterized in that: The fourth cartridge directional valve assembly includes a shuttle valve and a one-way opening electromagnetic cartridge directional valve, the inlet of the one-way opening electromagnetic cartridge directional valve is connected to the main oil inlet circuit, the control port is connected to the middle port of the shuttle valve, and the outlet is respectively connected to the top cylinder plug chamber working oil circuit and the side port of the shuttle valve, and the other side port of the shuttle valve is connected to the A port of the J-type three-position four-way electromagnetic valve in the third cartridge directional valve assembly and the pipeline connected to the overflow valve in the third cartridge pressure valve assembly.

9. The four-column universal cartridge valve hydraulic press control system according to claim 1, characterized in that: The fourth cartridge pressure valve assembly includes a one-way opening electromagnetic cartridge pressure valve and a relief valve, the inlet of the one-way opening electromagnetic cartridge pressure valve is connected to the working oil circuit of the top cylinder plug chamber, the control port is connected to the outlet through the relief valve, and the outlet is connected to the main return oil circuit, the control port of the one-way opening electromagnetic cartridge pressure valve is connected to a remote-controlled relief valve, and the pipeline connecting the B port of the J-type three-position four-way solenoid valve in the third cartridge directional valve assembly and the control port of the one-way opening electromagnetic cartridge directional valve is connected to the relief valve through a three-way and a one-way valve.

10. The four-column universal cartridge valve hydraulic press control system according to claim 1, characterized in that: A pressure gauge and a cartridge one-way valve are provided on the working oil circuit of the master cylinder plug chamber. The cartridge one-way valve is connected to the oil tank and is used to replenish oil to the plug chamber of the master cylinder. A pressure gauge is provided on the working oil circuit of the top cylinder plug chamber; the cartridge one-way valve is connected to the main oil inlet circuit through a one-two-position four-way solenoid valve.

Images