Hydraulic circuit

Abstract

The utility model discloses a hydraulic circuit, which relates to the technical field of hydraulic control systems and comprises an oil inlet pipeline, an oil return pipeline, a first working pipeline, a second working pipeline, a pilot overflow valve, a three-position four-way reversing valve, a one-way valve and a control valve. The oil return pipeline is connected with an oil return port of the three-position four-way reversing valve; one end of the first working pipeline is connected with a first working oil port of the three-position four-way reversing valve, and the other end of the first working pipeline is used for being connected with a rod cavity of a main oil cylinder. The second working pipeline is connected with a second working oil port of the three-position four-way reversing valve, and the other end of the second working pipeline is used for being connected with a rodless cavity of the main oil cylinder. A pilot-operated overflow valve is arranged between the oil inlet pipeline and the oil return pipeline, a control valve is arranged between the first working pipeline and the second working pipeline, and the one-way valve is arranged on the first working pipeline. The hydraulic circuit is simple in structure, low in failure rate, high in reliability and high in efficiency, and reduces energy consumption and cost.

Description

Technical Field

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

[0002] Currently, forging equipment manufacturers are increasingly demanding increased speed and reduced energy consumption, so increasing speed and reducing energy consumption have become the current development direction of forging equipment. Conventional forging equipment has a complex hydraulic system structure, high failure rate, serious leakage, low efficiency, and unreliable operation. To increase speed, it is basically achieved by increasing the pump unit. However, increasing the pump unit requires increasing costs, which increases both energy consumption and equipment costs. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a hydraulic circuit with simple structure, low failure rate, high reliability, high efficiency, and reduced energy consumption and cost.

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

[0005] The utility model provides a hydraulic circuit, comprising an oil inlet pipeline, an oil return pipeline, a first working pipeline, a second working pipeline, a pilot-operated overflow valve, a three-position four-way reversing valve, a one-way valve and a control valve, wherein the oil inlet pipeline is connected to the oil inlet port of the three-position four-way reversing valve, and the oil return pipeline is connected to the oil return port of the three-position four-way reversing valve; one end of the first working pipeline is connected to the first working oil port of the three-position four-way reversing valve, and the other end is used to be connected to the rod chamber of the master oil cylinder; the second working pipeline is connected to the second working oil port of the three-position four-way reversing valve, and the other end is used to be connected to the rodless chamber of the master oil cylinder; the oil inlet pipeline and the The pilot overflow valve is arranged between the return oil pipeline, the control valve is arranged between the first working pipeline and the second working pipeline, the one-way valve is arranged on the first working pipeline, and is located between the connection between the control valve and the first working pipeline and the three-position four-way reversing valve. The one-way valve is used to limit the oil in the rod chamber of the master oil cylinder to flow to the three-position four-way reversing valve, and the control valve is used to allow the oil in the rod chamber of the master oil cylinder to flow through the first working pipeline and the second working pipeline to the rodless chamber of the master oil cylinder or to disconnect the first working pipeline and the second working pipeline.

[0006] Preferably, it further comprises a one-way throttle valve, which is arranged on the first working pipeline and located between the connection between the control valve and the first working pipeline and the one-way valve.

[0007] Preferably, the one-way throttle valve is a plate-type one-way throttle valve.

[0008] Preferably, it further comprises a pressure monitoring component, which is arranged on the oil inlet pipeline and located between the connection between the pilot-operated relief valve and the oil inlet pipeline and the three-position four-way reversing valve.

[0009] Preferably, the pressure monitoring component is a pressure gauge.

[0010] Preferably, the control valve is a two-position four-way reversing valve, the oil inlet of the two-position four-way reversing valve is connected to the first working pipeline, and the first working oil port of the two-position four-way reversing valve is connected to the second working pipeline.

[0011] Preferably, the two-position four-way reversing valve is a two-position four-way electromagnetic reversing valve.

[0012] Preferably, the pilot-operated relief valve is a pilot-operated electromagnetic relief valve.

[0013] Preferably, the three-position four-way reversing valve is a three-position four-way electromagnetic reversing valve.

[0014] Preferably, the one-way valve is a superimposed one-way valve.

[0015] Compared with the prior art, the utility model has achieved the following technical effects:

[0016] After derrick hoists and puts in place, stamp fixedly derrick of derrick pin, make hydraulic oil lead to the base oil cylinder, hoist that base puts in place and fixing with same control mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 This is a structural diagram of the hydraulic circuit provided by the utility model.

[0019] Explanation of the accompanying reference numerals: 100, hydraulic circuit; 1, oil inlet line; 2, oil return line; 3, first working line; 4, second working line; 5, pilot-operated overflow valve; 6, pressure gauge; 7, three-position four-way reversing valve; 8, one-way valve; 9, one-way throttle valve; 10, two-position four-way reversing valve. DETAILED DESCRIPTION

[0020] 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.

[0021] The purpose of the utility model is to provide a hydraulic circuit with a simple structure, low failure rate, high reliability, high efficiency, and reduced energy consumption and cost.

[0022] 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.

[0023] like Figure 1 As shown, this embodiment provides a hydraulic circuit 100, including an oil inlet line 1, an oil return line 2, a first working line 3, a second working line 4, a pilot overflow valve 5, a three-position four-way reversing valve 7, a one-way valve 8 and a control valve, the oil inlet line 1 is connected to the oil inlet port of the three-position four-way reversing valve 7, and the oil return line 2 is connected to the oil return port of the three-position four-way reversing valve 7; one end of the first working line 3 is connected to the first working oil port of the three-position four-way reversing valve 7, and the other end is used to be connected to the rod chamber of the master cylinder; the second working line 4 is connected to the second working oil port of the three-position four-way reversing valve 7, and the other end is used to be connected to the rodless chamber of the master cylinder.

[0024] A pilot-operated overflow valve 5 is provided between the oil inlet line 1 and the oil return line 2, a control valve is provided between the first working line 3 and the second working line 4, and a one-way valve 8 is provided on the first working line 3 and is located between the connection between the control valve and the first working line 3 and the three-position four-way reversing valve 7. The one-way valve 8 is used to limit the oil in the rod chamber of the master cylinder from flowing to the three-position four-way reversing valve 7, and the control valve is used to allow the oil in the rod chamber of the master cylinder to flow through the first working line 3 and the second working line 4 to the rodless chamber of the master cylinder or to disconnect the first working line 3 and the second working line 4.

[0025] This embodiment also includes a one-way throttle valve 9, which is arranged on the first working pipeline 3 and is located between the connection between the control valve and the first working pipeline 3 and the one-way valve 8. The one-way throttle valve 9 is used to adjust the return speed of the master cylinder.

[0026] In this specific embodiment, the one-way throttle valve 9 is a plate-type one-way throttle valve.

[0027] The hydraulic circuit 100 in this embodiment can perform no-load starting, rapid descent of the master cylinder, slow descent of the master cylinder, and return of the master cylinder.

[0028] Specifically, when performing a no-load starting operation, the hydraulic oil enters the oil inlet line 1 and passes through the pilot-operated relief valve 5 and directly returns to the oil return line 2 and then to the oil tank, thereby achieving no-load starting.

[0029] When the main oil cylinder is operated to move downward quickly, the hydraulic oil enters from the oil inlet line 1, and the pilot-operated relief valve 5 sets the pressure to maintain the pressure at the system oil inlet position. By controlling the three-position four-way reversing valve 7, the oil enters the second working line 4 through the second working oil port of the three-position four-way reversing valve 7 and flows to the rodless chamber of the main oil cylinder; the one-way valve 8 can limit the oil in the rod chamber of the main oil cylinder to flow to the three-position four-way reversing valve 7. By controlling the control valve, the oil in the rod chamber of the main oil cylinder flows through the first working line 3 and the second working line 4 to the rodless chamber of the main oil cylinder, completing the differential action and realizing the rapid downward movement of the main oil cylinder.

[0030] When the master cylinder is operated to slowly descend, the control valve is controlled to disconnect the first working pipeline 3 and the second working pipeline 4; the hydraulic oil enters from the oil inlet pipeline 1, and the pilot-operated relief valve 5 sets the pressure to maintain the pressure at the system oil inlet position, and the three-position four-way reversing valve 7 is controlled to allow the oil to enter the second working pipeline 4 through the second working oil port of the three-position four-way reversing valve 7 and flow to the rodless chamber of the master cylinder, thereby realizing the slow descending of the master cylinder.

[0031] When the main oil cylinder is returning, the hydraulic oil enters from the oil inlet line 1, and the pilot-operated relief valve 5 sets the pressure to maintain the pressure at the system oil inlet position. By controlling the three-position four-way reversing valve 7, the oil enters the first working oil port of the three-position four-way reversing valve 7 into the first working line 3 and flows to the rod chamber of the main oil cylinder. In this process, the hydraulic oil passes through the one-way valve 8 and enters the one-way throttle valve 9. The one-way position of the one-way throttle valve 9 cannot flow in the reverse direction. After the throttle position of the one-way throttle valve 9, the oil enters the rod chamber of the main oil cylinder, completing the return action of the main oil cylinder. The return speed of the main oil cylinder can be adjusted by adjusting the one-way throttle valve 9.

[0032] The hydraulic circuit 100 in this embodiment can not only increase the forward speed of the main oil cylinder, but also adjust the return speed of the main oil cylinder. Compared with the method of increasing the speed by increasing the pump group, it reduces energy consumption and cost. The forward speed of the main oil cylinder of the hydraulic circuit 100 is much greater than the speed of the main oil cylinder moving forward by relying on the oil pump, and the speed-up effect is obvious. At the same time, the hydraulic circuit 100 has a simple structure, clear actions, clear principles, low failure rate, high reliability, high efficiency, and a wide range of uses. It can not only be used for the production of new equipment, but also for the transformation of old equipment, thereby bringing considerable economic benefits and stronger adaptability.

[0033] This embodiment also includes a pressure monitoring component, which is arranged on the oil inlet pipeline 1 and is located between the connection between the pilot relief valve 5 and the oil inlet pipeline 1 and the three-position four-way reversing valve 7. The pressure monitoring component is used to monitor the pressure changes at the oil inlet position.

[0034] In this specific embodiment, the pressure monitoring component is a pressure gauge 6 .

[0035] Specifically, the control valve is a two-position four-way directional valve 10 , the oil inlet of the two-position four-way directional valve 10 is connected to the first working pipeline 3 , and the first working oil port of the two-position four-way directional valve 10 is connected to the second working pipeline 4 .

[0036] In this specific embodiment, the two-position four-way directional control valve 10 is a two-position four-way electromagnetic directional control valve.

[0037] In this specific embodiment, the pilot-operated relief valve 5 is a pilot-operated electromagnetic relief valve.

[0038] In this specific embodiment, the three-position four-way directional valve 7 is a three-position four-way electromagnetic directional valve.

[0039] In this specific embodiment, the one-way valve 8 is a stacked one-way valve.

[0040] The specific usage process is: when performing the no-load starting operation, the hydraulic oil enters through the oil inlet pipe, the electromagnet YV1 of the pilot electromagnetic overflow valve is not energized, and the oil directly returns to the oil return port through the pilot electromagnetic overflow valve and returns to the oil tank to achieve no-load starting.

[0041] When the master cylinder is rapidly lowered, hydraulic oil enters the oil inlet pipe, energizing solenoid YV1 of the pilot-operated electromagnetic relief valve. The pilot-operated electromagnetic relief valve sets the pressure to maintain pressure at the system's oil inlet. Pressure gauge 6 continuously monitors pressure changes at the oil inlet. Electromagnet YV2 of the three-position, four-way solenoid directional valve is energized, placing the valve in the crossover position (PB). Oil flows through the three-position, four-way solenoid directional valve into the rodless chamber of the master cylinder. Electromagnet YV4 of the two-position, four-way solenoid directional valve is energized, placing the valve in the PA position. Because the oil in the rodless chamber of the master cylinder cannot flow in the opposite direction due to the presence of a superimposed check valve, the oil flows through the two-position, four-way solenoid directional valve in the PA position to the rodless chamber of the master cylinder, completing the differential action and enabling the master cylinder to rapidly descend.

[0042] When the master cylinder is slowly lowered, hydraulic oil enters the oil inlet pipe, energizing solenoid YV1 of the pilot-operated electromagnetic relief valve. The pilot-operated electromagnetic relief valve sets the pressure to maintain pressure at the system's oil inlet. Pressure gauge 6 continuously monitors pressure changes at the oil inlet. Solenoid YV4 of the two-position, four-way solenoid directional valve is de-energized, disconnecting the first working line 3 and the second working line 4. Solenoid YV2 of the three-position, four-way solenoid directional valve is energized, placing the valve in the crossover position (PB). Oil passes through the three-position, four-way solenoid directional valve and enters the rodless chamber of the master cylinder, causing the master cylinder to slowly descend.

[0043] When the master cylinder is returning, hydraulic oil enters through the oil inlet pipe, energizing the solenoid YV1 of the pilot-operated electromagnetic relief valve. The pilot-operated electromagnetic relief valve sets the pressure to maintain pressure at the system's oil inlet. Pressure gauge 6 continuously monitors pressure changes at the oil inlet. Energizing the solenoid YV3 of the three-position, four-way solenoid directional control valve, the three-position, four-way solenoid directional control valve is in the parallel position PA. Oil flows through the stacked check valve and into the plate-type one-way throttle valve. The plate-type one-way throttle valve is in the one-way position, preventing reverse flow. After the plate-type one-way throttle valve reaches the throttle position, oil enters the rod chamber of the master cylinder, completing the return stroke of the master cylinder. The return speed of the master cylinder can be adjusted by adjusting the plate-type one-way throttle valve.

[0044] This specification 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 circuit, characterized in that:

14. The 14th embodiment of the present invention relates to an oil pump, an oil pump for pumping oil to the oil pump of the oil pumping station, an oil pump for pumping oil to the oil pump outlet ... The pilot-operated overflow valve is provided, the control valve is provided between the first working pipeline and the second working pipeline, the one-way valve is provided on the first working pipeline, and is located between the connection between the control valve and the first working pipeline and the three-position four-way reversing valve. The one-way valve is used to limit the oil in the rod chamber of the master oil cylinder from flowing to the three-position four-way reversing valve, and the control valve is used to allow the oil in the rod chamber of the master oil cylinder to flow through the first working pipeline and the second working pipeline to the rodless chamber of the master oil cylinder or to disconnect the first working pipeline and the second working pipeline.

2. The hydraulic circuit according to claim 1, characterized in that It also includes a one-way throttle valve, which is arranged on the first working pipeline and is located between the connection between the control valve and the first working pipeline and the one-way valve.

3. The hydraulic circuit according to claim 2, characterized in that: The one-way throttle valve is a plate-type one-way throttle valve.

4. The hydraulic circuit according to claim 1, characterized in that It also includes a pressure monitoring component, which is arranged on the oil inlet pipeline and located between the connection between the pilot-operated relief valve and the oil inlet pipeline and the three-position four-way reversing valve.

5. The hydraulic circuit according to claim 4, characterized in that: The pressure monitoring component is a pressure gauge.

6. The hydraulic circuit according to claim 1, characterized in that The control valve is a two-position four-way reversing valve, the oil inlet of the two-position four-way reversing valve is connected to the first working pipeline, and the first working oil port of the two-position four-way reversing valve is connected to the second working pipeline.

7. The hydraulic circuit according to claim 6, characterized in that The two-position four-way reversing valve is a two-position four-way electromagnetic reversing valve.

8. The hydraulic circuit according to claim 1, characterized in that The pilot-operated relief valve is a pilot-operated electromagnetic relief valve.

9. The hydraulic circuit according to claim 1, characterized in that The three-position four-way directional valve is a three-position four-way electromagnetic directional valve.

10. The hydraulic circuit according to claim 1, wherein: The one-way valve is a superimposed one-way valve.

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