Hydraulic control system

Abstract

The utility model discloses a hydraulic control system, which relates to the technical field of hydraulic control and comprises an oil tank, a hydraulic pump, a main cylinder, a first electromagnetic plug-in mounting direction valve, a second electromagnetic plug-in mounting direction valve and a third electromagnetic plug-in mounting direction valve. The main oil supply path is communicated with a rapid cavity of the main cylinder through a first electromagnetic plug-in mounting direction valve, the main oil supply path is communicated with a lower cavity of the main cylinder through a second electromagnetic plug-in mounting direction valve, the main oil supply path is communicated with an upper cavity of the main cylinder through a third electromagnetic plug-in mounting direction valve, and the upper cavity, the lower cavity and the rapid cavity of the main cylinder are all communicated with an oil tank through an oil return path; sliding valve control of a conventional hydraulic machine is replaced by cartridge valve control, the hydraulic machine is simple in structure and stable in performance, can be widely applied to the fields of game coins, souvenir medal, medal and the like, brings considerable benefits, and can adjust the drift diameter of corresponding cartridge valve combination parts according to actual conditions so as to improve the application range.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic control, in particular to a hydraulic control system. Background Art

[0002] Hydraulic presses are commonly used production equipment. They mainly realize the operation of the cylinder by controlling the oil. However, in the hydraulic control systems for processing some small products, simple hydraulic slide valves are often used. For example, in the production of game coins, commemorative medals, medals and other fields for game consoles, hydraulic presses are more widely used than injection molding machines because of their advantage in pressing metal and non-metallic materials. At present, the hydraulic control system for this type of hydraulic press adopts hydraulic slide valve control, which has a relatively complex structure and the tonnage of this type of hydraulic press is relatively small.

[0003] Therefore, people are in urgent need of a hydraulic control system with simple structure and wide application range. Summary of the Invention

[0004] The purpose of the utility model is to provide a hydraulic control system to solve the problems existing in the above-mentioned prior art, and to use a cartridge valve to complete the control of the master cylinder. The utility model has a simple structure, stable performance and a wide range of applications.

[0005] To achieve the above-mentioned objectives, the present invention provides the following solution: The present invention provides a hydraulic control system, comprising a fuel tank, a hydraulic pump, a master cylinder, a first electromagnetic cartridge directional valve, a second electromagnetic cartridge directional valve, and a third electromagnetic cartridge directional valve, wherein the fuel tank is connected to a main oil supply line through the hydraulic pump, the main oil supply line is connected to a quick chamber of the master cylinder through the first electromagnetic cartridge directional valve, the main oil supply line is connected to a lower chamber of the master cylinder through the second electromagnetic cartridge directional valve, the main oil supply line is connected to an upper chamber of the master cylinder through the third electromagnetic cartridge directional valve, the upper chamber, lower chamber, and quick chamber of the master cylinder are all connected to the fuel tank through an oil return line, and a corresponding opening and closing mechanism is provided on the oil return line. Preferably, the first electromagnetic cartridge directional valve and the third electromagnetic cartridge directional valve are arranged in series, and along the flow direction of the inlet oil, the first electromagnetic cartridge directional valve is arranged close to the fuel tank.

[0006] Preferably, the oil inlet of the fast chamber is arranged in parallel with the third electromagnetic cartridge directional valve, and a branch is set in the pipeline between the third electromagnetic cartridge directional valve and the upper chamber of the master cylinder to connect to the oil inlet of the throttling electromagnetic cartridge valve, and the oil outlet of the throttling electromagnetic cartridge valve is connected to the oil tank.

[0007] Preferably, the main oil supply circuit is connected to the main oil return circuit through a first electromagnetic cartridge pressure valve, the first electromagnetic cartridge pressure valve includes a first cartridge valve and a first switching module for switching the control end pressure to high pressure, low pressure and no pressure, and the first switching module is connected to the control end of the first cartridge valve.

[0008] Preferably, the first switching module includes a first high-pressure relief valve, a first low-pressure relief valve and a first three-position four-way solenoid valve; the control end of the first cartridge valve, the first high-pressure relief valve, the first low-pressure relief valve and the oil inlet of the first three-position four-way solenoid valve are connected to the oil tank through the pump body; the oil outlet of the first low-pressure relief valve is connected to the B port of the first three-position four-way solenoid valve; the T port of the first three-position four-way solenoid valve and the oil outlet of the first high-pressure relief valve are connected through a connecting pipe, and the connecting pipe is connected to the oil tank.

[0009] Preferably, a second electromagnetic cartridge pressure valve is provided on the main oil return line, and the second electromagnetic cartridge pressure valve is connected to the main oil return line through two oil outlets. The annular oil outlet cavity of the second electromagnetic cartridge pressure valve forms an annular cavity for the normal flow of the outlet oil. The oil outlet of the second electromagnetic cartridge directional valve is connected to the lower cavity through the lower oil inlet line, and the oil outlet of the second electromagnetic cartridge directional valve is connected to the oil inlet of the second electromagnetic cartridge pressure valve through the return oil line. The second electromagnetic cartridge pressure valve includes a second cartridge valve and a second switching module for switching the control end pressure to high pressure and low pressure. The second switching module is connected to the control end of the second cartridge valve.

[0010] Preferably, the second switching module includes a second high-pressure relief valve, a second low-pressure relief valve and a two-position four-way solenoid valve; the control end of the second cartridge valve, the second high-pressure relief valve, the second low-pressure relief valve and the oil inlet of the two-position four-way solenoid valve are connected to the oil tank through the pump body; the oil outlet of the second low-pressure relief valve is connected to the A port of the two-position four-way solenoid valve; the T port of the two-position four-way solenoid valve and the oil outlet of the second high-pressure relief valve are connected through a connecting pipe, and the connecting pipe is connected to the oil tank.

[0011] Preferably, a pressure-maintaining valve is provided on the oil inlet path of the upper chamber.

[0012] Preferably, the upper chamber is connected to the oil tank through a filling valve.

[0013] Preferably, the hydraulic control system further includes a punching cylinder, which is connected to the main oil supply circuit via a second three-position four-way solenoid valve.

[0014] Compared with the prior art, the present invention has achieved the following technical effects:

[0015] The use of cartridge valve control to replace the slide valve control of conventional hydraulic presses has a simple structure and stable performance. It can be widely used in the fields of game coins, commemorative medals, medals, etc., bringing considerable economic benefits. In addition, the diameter size of the corresponding cartridge valve combination parts can be adjusted according to actual conditions to expand the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0017] Figure 1 This is a system principle diagram of the hydraulic control system in the embodiment of the present utility model;

[0018] Among them, 1. Oil tank; 2. Hydraulic pump; 3. First solenoid cartridge directional valve; 4. Second solenoid cartridge directional valve; 5. Third solenoid cartridge directional valve; 6. First solenoid cartridge pressure valve; 7. Second solenoid cartridge pressure valve; 8. First high-pressure relief valve; 9. First low-pressure relief valve; 10. First three-position four-way solenoid valve; 11. Second high-pressure relief valve; 12. Second low-pressure relief valve; 13. Two-position four-way solenoid valve; 14. Throttle solenoid cartridge valve; 15. Second three-position four-way solenoid valve; 16. Master cylinder; 17. Feeding cylinder; 18. Pressure maintaining valve; 19. Filling valve; 20. First pressure gauge; 21. Second pressure gauge; 22. Pressure sensor. DETAILED DESCRIPTION

[0019] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0020] The purpose of the utility model is to provide a hydraulic control system to solve the problems existing in the prior art, and to use a cartridge valve to complete the control of the master cylinder, which has a simple structure, stable performance and a wide range of applications.

[0021] 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 implementation methods.

[0022] Please refer to Figure 1As shown, a hydraulic control system is provided, including a fuel tank 1, a hydraulic pump 2, a master cylinder 16, a first solenoid cartridge directional valve 3, a second solenoid cartridge directional valve 4, and a third solenoid cartridge directional valve 5. The fuel tank 1 is connected to a main oil supply circuit via the hydraulic pump 2. The main oil supply circuit is connected to the fast chamber of the master cylinder 16 via the first solenoid cartridge directional valve 3. The main oil supply circuit is connected to the lower chamber of the master cylinder 16 via the second solenoid cartridge directional valve 4. The main oil supply circuit is connected to the upper chamber of the master cylinder 16 via the third solenoid cartridge directional valve 5. By controlling the opening and closing of the first solenoid cartridge directional valve 3, the second solenoid cartridge directional valve 4, and the third solenoid cartridge directional valve 5, oil can be supplied to the fast chamber, the upper chamber, and the lower chamber. The upper chamber, the lower chamber, and the fast chamber of the master cylinder 16 are all connected to the fuel tank 1 via an oil return circuit, and corresponding opening and closing mechanisms are provided on the oil return circuit. The use of cartridge valve control instead of the slide valve control of a conventional hydraulic press has a simple structure and stable performance. Moreover, the diameter of the corresponding cartridge valve assembly components can be adjusted according to actual conditions to expand the scope of application.

[0023] In this embodiment, a first electromagnetic cartridge directional valve 3 and a third electromagnetic cartridge directional valve 5 are arranged in series. Along the flow direction of the inlet oil, the first electromagnetic cartridge directional valve 3 is arranged close to the oil tank 1. The third electromagnetic cartridge directional valve 5 can be closed first. After the oil passes through the first electromagnetic cartridge directional valve 3 and fills the fast chamber, the third electromagnetic cartridge directional valve 5 is opened and the oil begins to enter the upper chamber.

[0024] The oil inlet of the fast chamber is arranged in parallel with the third electromagnetic cartridge directional valve 5. A branch is set in the pipeline between the third electromagnetic cartridge directional valve 5 and the upper chamber of the master cylinder to connect to the oil inlet of the throttling electromagnetic cartridge valve 14. The oil outlet of the throttling electromagnetic cartridge valve 14 is connected to the oil tank 1. The throttling electromagnetic cartridge valve 14 is used to open when the master cylinder 16 needs to relieve pressure.

[0025] The main oil supply circuit is connected to the main oil return circuit through the first electromagnetic cartridge pressure valve 6. The first electromagnetic cartridge pressure valve 6 includes a first cartridge valve and a first switching module for switching the control end pressure to high pressure, low pressure and no pressure. The first switching module is connected to the control end of the first cartridge valve. The first electromagnetic cartridge pressure valve 6 can be used to control the pressure in the oil circuit.

[0026] In this embodiment, the first switching module includes a first high-pressure relief valve 8, a first low-pressure relief valve 9 and a first three-position four-way solenoid valve 10. The first three-position four-way solenoid valve 10 includes a P port, a T port, an A port and a B port. The P port is the oil inlet, the T port is the oil outlet, and the A port and the B port are the working oil ports. The control end of the first cartridge valve, the first high-pressure relief valve 8, the first low-pressure relief valve 9 and the oil inlet of the first three-position four-way solenoid valve 10 are connected to the oil tank 1 through the pump body. Specifically: the four are connected to the oil outlet pipeline of the pump body through a five-way connection, or the four are connected through a four-way connection, and an interface is set on any of the passages to connect to the oil outlet pipeline of the pump body. The oil outlet of the first low-pressure relief valve 9 is connected to the B port of the first three-position four-way solenoid valve 10, the A port of the first three-position four-way solenoid valve 10 is blocked, the T port of the first three-position four-way solenoid valve 10 and the oil outlet of the first high-pressure relief valve 8 are connected through a connecting pipeline, and the connecting pipeline is connected to the oil tank 1. The first three-position four-way solenoid valve 10 includes two control terminals YV0 and YV1 for switching the passage. When YV0 and YV1 are not energized, the oil leaks directly, which is a no-pressure working condition; when YV0 is energized and YV1 is not energized, this is a high-pressure working condition; when YV1 is energized and YV0 is not energized, this is a low-pressure working condition.

[0027] A second electromagnetic cartridge pressure valve 7 is provided on the main oil return line. The second electromagnetic cartridge pressure valve 7 is connected to the main oil return line through two oil outlets. The annular oil outlet cavity of the second electromagnetic cartridge pressure valve 7 forms an annular cavity for the normal flow of oil. The oil outlet of the second electromagnetic cartridge directional valve 4 is connected to the lower cavity through the lower oil inlet line. The oil outlet of the second electromagnetic cartridge directional valve 4 is connected to the oil inlet of the second electromagnetic cartridge pressure valve 7 through the return oil line. The second electromagnetic cartridge pressure valve 7 includes a second cartridge valve and a second switching module for switching the control end pressure to high pressure and low pressure. The second switching module is connected to the control end of the second cartridge valve. The second electromagnetic cartridge pressure valve 7 is an opening and closing mechanism set for the oil return line of the lower cavity.

[0028] In this embodiment, the second switching module includes a second high-pressure relief valve 11, a second low-pressure relief valve 12 and a two-position four-way solenoid valve 13. The two-position four-way solenoid valve 13 also has four PTAB ports, and its B port is blocked. The control end of the second cartridge valve, the second high-pressure relief valve 11, the second low-pressure relief valve 12 and the oil inlet of the two-position four-way solenoid valve 13 are connected to the oil tank 1 through the pump body, and the oil outlet of the second low-pressure relief valve 12 is connected to the A port of the two-position four-way solenoid valve 13. The T port of the two-position four-way solenoid valve 13 and the oil outlet of the second high-pressure relief valve 11 are connected through a connecting pipeline, and the connecting pipeline is connected to the oil tank 1. The two-position four-way solenoid valve 13 has a control end YV2 for switching the passage. When YV2 is energized, it is a low-pressure working condition; when YV2 is not energized, it is a high-pressure working condition.

[0029] A pressure-maintaining valve 18 is provided on the oil inlet line of the upper chamber to maintain the system pressure stable. When the first electromagnetic cartridge directional valve 3 and the third electromagnetic cartridge directional valve 5 are connected in series, the pressure-maintaining valve 18 is provided on the side of the third electromagnetic cartridge directional valve 5 where the throttling electromagnetic cartridge valve 14 is connected to the upper chamber oil inlet line.

[0030] The upper chamber is connected to the oil tank 1 via a charging valve 19, which replenishes the upper chamber with oil when the rapid chamber is filled. In this embodiment, the control port of the charging valve 19 is connected to the main oil return line via a solenoid valve within the second solenoid directional valve 4. When the second solenoid directional valve 4 is opened, the charging valve 19 opens, thus serving as the opening and closing mechanism for the oil return lines of the rapid chamber and the upper chamber.

[0031] Since game coins, commemorative medals and medals need to be pushed out by the punching cylinder 17 after being pressed by the main cylinder 16 during the manufacturing process, the hydraulic control system also includes the punching cylinder 17, and the two cavities of the punching cylinder 17 are connected to the main oil supply circuit through the second three-position four-way solenoid valve 15.

[0032] The second three-position four-way solenoid valve 15 includes two control terminals YV3 and YV4. In this embodiment, the first solenoid cartridge directional valve 3, the second solenoid cartridge directional valve 4, the third solenoid cartridge directional valve 5 and the throttling solenoid cartridge valve 14 are all provided with solenoid valves for controlling their opening and closing, wherein the solenoid valve in the first solenoid cartridge directional valve 3 has a control terminal YV5, the solenoid valve in the second solenoid cartridge directional valve 4 has a control terminal YV6, the solenoid valve in the third solenoid cartridge directional valve 5 has a control terminal YV7, and the solenoid valve in the throttling solenoid cartridge valve 14 has a control terminal YV8.

[0033] In order to observe the internal pressure, a first pressure gauge 20 and a second pressure gauge 21 are respectively provided on the main oil inlet and the upper chamber oil inlet, and a pressure sensor 22 is provided on the main oil inlet.

[0034] In actual use, there are seven working conditions, namely:

[0035] The master cylinder 16 moves down quickly: the control end YV0 of the first three-position four-way solenoid valve 10 is energized, and the system is under high pressure; the control end YV5 of the solenoid valve is energized, the first electromagnetic cartridge directional valve 3 is opened, and oil enters the fast chamber; the control end YV2 of the two-position four-way solenoid valve 13 is energized, the second electromagnetic cartridge pressure valve 7 is opened, and oil is discharged from the lower chamber.

[0036] The master cylinder 16 slowly moves down: the control end YV0 of the first three-position four-way solenoid valve 10 is energized, and the system is under high pressure; the control end YV5 of the solenoid valve is energized, and the first solenoid cartridge directional valve 3 is opened; the control end YV7 of the solenoid valve is energized, and the third solenoid cartridge directional valve 5 is opened, and the oil enters the upper chamber after passing through the pressure-maintaining valve 18; the control end YV2 of the two-position four-way solenoid valve 13 is energized, and the second solenoid cartridge pressure valve 7 is opened, and the oil is discharged from the lower chamber.

[0037] Maintain pressure: All solenoid valves are de-energized.

[0038] The master cylinder 16 is depressurized: the control end YA1 of the first three-position four-way solenoid valve 10 is energized, and the system is under low pressure; the control end YV8 of the solenoid valve is energized, and the throttling solenoid cartridge valve 14 is opened to release oil.

[0039] Return stroke of the master cylinder 16: the control end YV0 of the first three-position four-way solenoid valve 10 is energized, the control end YV6 of the solenoid valve is energized, the second solenoid cartridge directional valve 4 is opened, the filling valve 19 is opened, and the oil in the upper chamber returns to the oil tank 1; the control end YV5 of the solenoid valve is energized, the third solenoid cartridge directional valve 5 is opened, and the oil in the fast chamber returns to the upper chamber through the pressure maintaining valve 18 and returns to the oil tank 1 together.

[0040] The punching cylinder 17 moves upward: the control end YV0 of the first three-position four-way solenoid valve 10 is energized, and the control end YV4 of the second three-position four-way solenoid valve 15 is energized.

[0041] The punching cylinder 17 moves downward: the control end YV0 of the first three-position four-way solenoid valve 10 is energized, and the control end YV3 of the second three-position four-way solenoid valve 15 is energized.

[0042] Adaptive changes based on actual needs are all within the protection scope of this utility model.

[0043] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0044] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A hydraulic control system, characterized in that: It includes an oil tank, a hydraulic pump, a master cylinder, a first electromagnetic cartridge directional valve, a second electromagnetic cartridge directional valve and a third electromagnetic cartridge directional valve. The oil tank is connected to the main oil supply circuit through the hydraulic pump. The main oil supply circuit is connected to the fast chamber of the master cylinder through the first electromagnetic cartridge directional valve. The main oil supply circuit is connected to the lower chamber of the master cylinder through the second electromagnetic cartridge directional valve. The main oil supply circuit is connected to the upper chamber of the master cylinder through the third electromagnetic cartridge directional valve. The upper chamber, lower chamber and fast chamber of the master cylinder are all connected to the oil tank through an oil return circuit. A corresponding opening and closing mechanism is provided on the oil return circuit.

2. The hydraulic control system according to claim 1, characterized in that: The first electromagnetic cartridge directional valve and the third electromagnetic cartridge directional valve are arranged in series. Along the flow direction of the inlet oil, the first electromagnetic cartridge directional valve is arranged close to the oil tank.

3. The hydraulic control system according to claim 2, characterized in that: The oil inlet of the fast chamber is arranged in parallel with the third electromagnetic cartridge directional valve. A branch is set in the pipeline between the third electromagnetic cartridge directional valve and the upper chamber of the master cylinder to connect to the oil inlet of the throttling electromagnetic cartridge valve. The oil outlet of the throttling electromagnetic cartridge valve is connected to the oil tank.

4. The hydraulic control system according to claim 1, characterized in that: The main oil supply circuit is connected to the main oil return circuit through a first electromagnetic cartridge pressure valve. The first electromagnetic cartridge pressure valve includes a first cartridge valve and a first switching module for switching the control end pressure to high pressure, low pressure and no pressure. The first switching module is connected to the control end of the first cartridge valve.

5. The hydraulic control system according to claim 4, characterized in that: The first switching module includes a first high-pressure relief valve, a first low-pressure relief valve and a first three-position four-way solenoid valve. The control end of the first cartridge valve, the first high-pressure relief valve, the first low-pressure relief valve and the oil inlet of the first three-position four-way solenoid valve are connected to the oil tank through a pump body. The oil outlet of the first low-pressure relief valve is connected to the B port of the first three-position four-way solenoid valve. The T port of the first three-position four-way solenoid valve and the oil outlet of the first high-pressure relief valve are connected through a connecting pipeline, and the connecting pipeline is connected to the oil tank.

6. The hydraulic control system according to claim 4, characterized in that: A second electromagnetic cartridge pressure valve is provided on the main oil return line. The second electromagnetic cartridge pressure valve is connected to the main oil return line through two oil outlets. The annular oil outlet cavity of the second electromagnetic cartridge pressure valve forms an annular cavity for the normal flow of the outlet oil. The oil outlet of the second electromagnetic cartridge directional valve is connected to the lower cavity through the lower oil inlet line. The oil outlet of the second electromagnetic cartridge directional valve is connected to the oil inlet of the second electromagnetic cartridge pressure valve through the return oil line. The second electromagnetic cartridge pressure valve includes a second cartridge valve and a second switching module for switching the control end pressure to high pressure and low pressure. The second switching module is connected to the control end of the second cartridge valve.

7. The hydraulic control system according to claim 6, characterized in that: The second switching module includes a second high-pressure relief valve, a second low-pressure relief valve and a two-position four-way solenoid valve. The control end of the second cartridge valve, the second high-pressure relief valve, the second low-pressure relief valve and the oil inlet of the two-position four-way solenoid valve are connected to the oil tank through the pump body, the oil outlet of the second low-pressure relief valve is connected to the A port of the two-position four-way solenoid valve, the T port of the two-position four-way solenoid valve and the oil outlet of the second high-pressure relief valve are connected through a connecting pipeline, and the connecting pipeline is connected to the oil tank.

8. The hydraulic control system according to claim 1, characterized in that: A pressure maintaining valve is provided on the oil inlet path of the upper chamber.

9. The hydraulic control system according to claim 1, characterized in that: The upper chamber is communicated with the oil tank through a filling valve.

10. The hydraulic control system according to claim 1, characterized in that: The hydraulic control system further comprises a punching cylinder, which is connected to the main oil supply path via a second three-position four-way solenoid valve.

Images