Multi-stage speed regulation hydraulic system

Abstract

The utility model relates to a multistage speed regulation hydraulic system which comprises a first oil way and a second oil way which are arranged in parallel, one end of the first oil way and one end of the second oil way are communicated with an oil supply port of an oil tank through a valve body, and the other end of the first oil way and the other end of the second oil way are communicated with a first cavity or a second cavity of a hydraulic cylinder respectively. A first throttling component is arranged on the first oil way or the second oil way, the first throttling component is arranged on the first oil way or the second oil way, so that the two oil ways have different overflowing areas, and the on-off state of the first oil way and the on-off state of the second oil way can be changed through the valve body. Therefore, the oil tank and the hydraulic cylinder can communicate through the first oil way or the second oil way with different overflowing areas, hydraulic oil enters the hydraulic cylinder at different oil speeds through one hydraulic pump, extra burden on the hydraulic pump is avoided, special upgrading of the hydraulic pump is not needed, and the cost is reduced. And the equipment investment cost under the one-pump multi-speed working state is reduced.

Description

Technical Field

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

[0002] With the rapid development of production levels and increasingly fierce market competition, forging equipment manufacturers have higher and higher requirements for forging machines, making multi-stage speed regulation of forging equipment the development direction of existing forging equipment.

[0003] Existing forging equipment often achieves the above purpose by adjusting the displacement of the hydraulic pump or adjusting the speed of the hydraulic motor. However, this method has high requirements for the hydraulic pump or hydraulic motor, which will undoubtedly greatly increase the investment cost of the equipment.

[0004] Therefore, there is an urgent need for a multi-stage speed regulation hydraulic system with low investment cost. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a multi-stage speed regulation hydraulic system, which changes the flow area between the oil supply port and the hydraulic cylinder oil chamber by setting oil circuits in parallel, realizes multi-speed operation of one pump, and thus reduces the cost required for equipment investment.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] A multi-stage speed regulation hydraulic system includes: a first oil circuit and a second oil circuit arranged in parallel, one end of the first oil circuit and the second oil circuit is connected to the oil supply port of the oil tank through a valve body, the other end of the first oil circuit and the second oil circuit is respectively connected to the first chamber or the second chamber of the hydraulic cylinder, and a first throttling component is provided on the first oil circuit or the second oil circuit.

[0008] Preferably, a third oil circuit is further included, and the third oil circuit is arranged in parallel with the first oil circuit and the second oil circuit, one end of the third oil circuit is connected to the oil supply port through a valve body, and the other end of the third oil circuit is connected to the first chamber or the second chamber, and a second throttling component is provided on the third oil circuit, and the flow area of ​​the first throttling component is different from that of the second throttling component.

[0009] Preferably, the first oil circuit and the second oil circuit are connected to the oil supply port of the oil tank through a first switching valve, the third oil circuit is connected to the oil supply port through a second switching valve, the P port of the first switching valve is connected to the oil supply port, the A port of the first switching valve is connected to the first chamber or the second chamber, the B port of the first switching valve is connected to the P port of the second switching valve, the A port of the second switching valve is connected to the first chamber or the second chamber through the first throttling component, and the B port of the second switching valve is connected to the first chamber or the second chamber through the second throttling component.

[0010] Preferably, a third switching valve is further included, wherein the P port of the third switching valve is connected to the first oil circuit and the second oil circuit respectively, the A port of the third switching valve is connected to the first chamber, and the B port of the third switching valve is connected to the second chamber.

[0011] Preferably, the T port of the third switching valve is connected to the oil return port of the oil tank.

[0012] Preferably, the first throttling component and the second throttling component are throttle valves.

[0013] Preferably, a pressure gauge is provided at the inlet end of the first oil circuit and / or the second oil circuit.

[0014] Preferably, one-way valves are provided on the first oil circuit and the second oil circuit.

[0015] Preferably, an overflow valve is provided at the inlet end of the first oil circuit and / or the second oil circuit.

[0016] Preferably, a pressure gauge is provided at the inlet of the first chamber and / or the second chamber.

[0017] Compared with the prior art, the utility model has achieved the following technical effects:

[0018] In the multi-stage speed regulation hydraulic system disclosed in the present application, a first oil circuit and a second oil circuit are arranged in parallel between the oil tank and the hydraulic cylinder, and a first throttling component is provided on the first oil circuit or the second oil circuit, so that the two oil circuits have different flow areas, and the on-off state of the first oil circuit and the second oil circuit can be changed by the valve body, so that the oil tank and the hydraulic cylinder can be connected through the first oil circuit or the second oil circuit with different flow areas respectively, and the hydraulic oil enters the hydraulic cylinder at different oil speeds through a hydraulic pump, which will not generate additional burden on the hydraulic pump, so there is no need for special upgrades to the hydraulic pump, reducing the equipment investment cost under the multi-speed working state of one pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or 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.

[0020] Attachment Figure 1 A schematic diagram of an embodiment of the present invention

[0021] Among them, 1. the first throttling component; 2. the second throttling component; 3. the first switching valve; 4. the second switching valve; 5. the third switching valve; 6. the pressure gauge; 7. the one-way valve; 8. the overflow valve. DETAILED DESCRIPTION

[0022] 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.

[0023] The purpose of the utility model is to provide a multi-stage speed regulation hydraulic system, which changes the flow area between the oil tank and the hydraulic cylinder through parallel pipelines, realizes multi-speed operation of one pump, and reduces the cost required for equipment investment.

[0024] 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.

[0025] refer to Figure 1The multi-stage speed regulation hydraulic system disclosed in the embodiment of the present invention includes: a first oil circuit and a second oil circuit, the first oil circuit and the second oil circuit are arranged in parallel, the inlet ends of the first oil circuit and the second oil circuit are connected to the oil supply hole of the oil tank through a valve body, and the outlet ends of the first oil circuit and the second oil circuit are respectively connected to the first chamber or the second chamber of the hydraulic cylinder, and a first throttling component 1 is provided on the first oil circuit or the second oil circuit; the throttling component can change the flow area of ​​the oil circuit in which it is located, so that the flow area of ​​the oil circuit is reduced, thereby changing the flow rate of the hydraulic oil in the oil circuit per unit time. When it is necessary to change the forward or backward speed of the hydraulic cylinder output shaft, the first oil circuit and the second oil circuit can be changed through the valve body. The on-off state of the oil circuit, when the first oil circuit is connected, the second oil circuit is disconnected, and the hydraulic oil in the oil tank enters the hydraulic cylinder through the first oil circuit; when the second oil circuit is connected, the first oil circuit is connected, and the hydraulic oil in the oil tank enters the hydraulic cylinder through the second oil circuit. Since the flow areas of the first oil circuit and the second oil circuit are different, the above method can be used to realize the hydraulic oil entering the hydraulic cylinder at different oil speeds through one hydraulic pump, and this process will not generate additional burden on the hydraulic pump, and there is no need for special upgrades to the hydraulic pump, which reduces the equipment investment cost in the multi-speed working state of one pump. At the same time, the oil inlet speed of the hydraulic cylinder is adjusted by switching the oil circuit with a valve, and its response speed is faster and the reliability is higher.

[0026] It can be understood that: the above-mentioned valves can be two stop valves independently arranged on the first oil circuit and the second oil circuit. When the first oil circuit is working, the stop valve on the first oil circuit is in a flow state, and the stop valve on the second oil circuit is in a stop state. When the second oil circuit is working, the stop valve on the second oil circuit is in a flow state, and the stop valve on the first oil circuit is in a stop state. It can also be a switching valve, the oil inlet of the switching valve is connected to the oil supply hole of the oil tank, and the two oil outlets of the switching valve are respectively connected to the first oil circuit and the second oil circuit, and then one of the first oil circuit and the second oil circuit is connected to the oil supply hole of the oil tank through the switching valve.

[0027] As a preferred embodiment, it also includes a third oil circuit, which is arranged in parallel with the first oil circuit and the second oil circuit. One end of the third oil circuit is connected to the oil supply port through the valve body, and the other end of the third oil circuit is connected to the first chamber or the second chamber. A second throttling component 2 is provided on the third oil circuit, and the flow area of ​​the first throttling component 1 is different from that of the second throttling component 2; the third oil circuit has a flow area different from that of the first oil circuit and the second oil circuit, and the flow rate of hydraulic oil per unit time in the first oil circuit, the second oil circuit and the third oil circuit is different. By connecting the first oil circuit, the second oil circuit or the third oil circuit between the oil supply port and the hydraulic cylinder through the valve body, the speed of the hydraulic cylinder output shaft moving forward or backward can be changed, making the working mode of the hydraulic cylinder more diverse.

[0028] Of course, according to actual needs, more oil circuits with different flow areas can be connected in parallel between the hydraulic cylinder and the oil tank.

[0029] As a preferred embodiment, the first oil circuit and the second oil circuit are connected to the oil supply port of the oil tank through the first switching valve 3, the third oil circuit is connected to the oil supply port through the second switching valve 4, the P port of the first switching valve 3 is connected to the oil supply port, the A port of the first switching valve 3 is connected to the first chamber or the second chamber, the B port of the first switching valve 3 is connected to the P port of the second switching valve 4, the A port of the second switching valve 4 is connected to the first chamber or the second chamber through the first throttling component 1, and the B port of the second switching valve 4 is connected to the first chamber or the second chamber through the second throttling component 2; preferably, the first switching valve 3 is a D-type two-position four-way electromagnetic switching valve; more preferably, the second switching valve 4 is a D-type two-position four-way electromagnetic switching valve.

[0030] As a preferred embodiment, it also includes a third switching valve 5, the P port of the third switching valve 5 is connected to the first oil circuit and the second oil circuit respectively, the A port of the third switching valve 5 is connected to the first chamber, and the B port of the third switching valve 5 is connected to the second chamber; preferably, the third switching valve 5 is a J-type three-position four-way electromagnetic switching valve, at this time, the P port of the third switching valve 5 is connected to the A port of the first switching valve 3 and the A port of the second switching valve 4; further, when there are three oil circuits, the B port of the second switching valve 4 is also connected to the P port of the third switching valve 5.

[0031] As a preferred embodiment, the T port of the third switching valve 5 is connected to the oil return port of the oil tank; when the output shaft of the hydraulic cylinder retracts, the first switching valve 3 is in the PA pass state, and the third switching valve 5 is in the PB pass and AT pass states. The hydraulic oil flowing out of the oil supply port of the oil tank enters the second chamber through the PA passage of the first switching valve 3 and the PB passage of the third switching valve 5, and the hydraulic oil in the first chamber flows back to the oil tank through the AT passage.

[0032] Of course, the returned hydraulic oil can also flow into an external collection device through other pipelines, and after being collected by the external collection device, it can be re-injected into the oil tank for reuse.

[0033] More preferably, the first throttle component 1 and the second throttle component 2 are throttle valves; preferably, the first throttle component 1 and the second throttle component 2 are superimposed double one-way throttle valves; of course, the first throttle component 1 and the second throttle component 2 can also be damping holes with different flow areas.

[0034] As a preferred embodiment, a pressure gauge 6 is provided at the inlet end of the first oil circuit and / or the second oil circuit. Furthermore, a pressure gauge 6 is provided between the P port of the first switching valve 3 and the oil supply hole, and the pressure gauge 6 can be used to monitor the changes in the oil pressure entering the oil circuit.

[0035] Furthermore, a pressure gauge 6 is provided between the A port of the third switching valve 5 and the first chamber, and between the B port of the third switching valve 5 and the second chamber, thereby enabling monitoring of the pressures of the first chamber and the second chamber.

[0036] As a preferred embodiment, a one-way valve 7 is provided in the first oil circuit and the second oil circuit; further, a one-way valve 7 is provided downstream of the A port of the first switching valve 3 and between the A port of the second switching valve 4 and the first throttling component 1; preferably, the one-way valve 7 is an E-type superimposed one-way valve 7; the one-way valve 7 can prevent the hydraulic oil from flowing back.

[0037] More preferably, a one-way valve 7 is also provided between the port B of the second switching valve 4 and the second throttle component 2 .

[0038] As a preferred embodiment, an overflow valve 8 is provided at the inlet end of the first oil circuit and / or the second oil circuit; after the hydraulic oil flows out of the oil supply port, it enters the overflow valve 8, and the overflow valve 8 sets the pressure to maintain the pressure at the oil supply port.

[0039] Preferably, an overflow valve 8 is provided between port A of the third switching valve 5 and the first chamber, and between port B of the third switching valve 5 and the second chamber. The pressure values ​​at the inlet of the first chamber and the inlet of the second chamber can be set by the overflow valve 8.

[0040] Furthermore, the relief valve 8 is a VC type superimposed relief valve 8 or a VP type superimposed relief valve 8 .

[0041] As a preferred embodiment, a pressure gauge 6 is provided at the inlet of the first chamber and / or the second chamber; the pressure at the inlet of the first chamber and / or the inlet of the second chamber can be monitored by the pressure gauge 6.

[0042] Taking the example of the gradual decrease of the flow area from the first oil circuit, the second oil circuit, and the third oil circuit, when the first oil circuit is connected between the oil supply port and the hydraulic cylinder, the first switching valve 3 is in the PA pass state, and the third switching valve 5 is in the PA pass and BT pass states. The hydraulic oil flowing out of the oil supply port of the oil tank enters the first chamber through the PA passage of the first switching valve 3 and the PA passage of the third switching valve 5. At the same time, the hydraulic oil in the second chamber flows into the oil tank through the BT passage of the third switching valve 5 and the oil return port of the oil tank, thereby realizing the constant speed forward movement of the hydraulic cylinder output shaft; when the second oil circuit is connected between the oil supply port and the hydraulic cylinder, the first switching valve 3 is in the PB pass state, the second switching valve 4 is in the PA pass state, and the third switching valve 5 is in the PA pass and BT pass state ... The PA passage, the PA passage of the second switching valve 4, and the PA passage of the third switching valve 5 enter the first chamber. At the same time, the hydraulic oil in the second chamber flows into the oil tank through the BT passage of the third switching valve 5 and the oil return port of the oil tank, realizing the medium-speed forward movement of the hydraulic cylinder output shaft; when the third oil passage is connected between the oil supply port and the hydraulic cylinder, the first switching valve 3 is in the PB pass state, the second switching valve 4 is in the PB pass state, and the third switching valve 5 is in the PA pass and BT pass states. The hydraulic oil flowing out of the oil supply port of the oil tank enters the first chamber through the PB passage of the first switching valve 3, the PB passage of the second switching valve 4, and the PA passage of the third switching valve 5. At the same time, the hydraulic oil in the second chamber flows into the oil tank through the BT passage of the third switching valve 5 and the oil return port of the oil tank, realizing the low-speed forward movement of the hydraulic cylinder output shaft.

[0043] Adaptive changes based on actual needs are all within the protection scope of this utility model.

[0044] 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 considered 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 included within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

Claims

1. A multi-stage speed regulating hydraulic system, characterized in that: include: A first oil circuit and a second oil circuit are arranged in parallel, one end of the first oil circuit and the second oil circuit is connected to the oil supply port of the oil tank through a valve body, and the other end of the first oil circuit and the second oil circuit is connected to the first chamber or the second chamber of the hydraulic cylinder respectively, and a first throttling component (1) is provided on the first oil circuit or the second oil circuit.

2. The multi-stage speed regulating hydraulic system according to claim 1, characterized in that: The invention also includes a third oil circuit, which is arranged in parallel with the first oil circuit and the second oil circuit. One end of the third oil circuit is connected to the oil supply port through a valve body, and the other end of the third oil circuit is connected to the first chamber or the second chamber. A second throttling component (2) is arranged on the third oil circuit, and the flow areas of the first throttling component (1) and the second throttling component (2) are different.

3. The multi-stage speed regulating hydraulic system according to claim 2, characterized in that: The first oil circuit and the second oil circuit are connected to the oil supply port of the oil tank through the first switching valve (3), the third oil circuit is connected to the oil supply port through the second switching valve (4), the P port of the first switching valve (3) is connected to the oil supply port, the A port of the first switching valve (3) is connected to the first chamber or the second chamber, the B port of the first switching valve (3) is connected to the P port of the second switching valve (4), the A port of the second switching valve (4) is connected to the first chamber or the second chamber through the first throttling component (1), and the B port of the second switching valve (4) is connected to the first chamber or the second chamber through the second throttling component (2).

4. The multi-stage speed regulating hydraulic system according to claim 1, characterized in that: The invention also includes a third switching valve (5), wherein the P port of the third switching valve (5) is connected to the first oil circuit and the second oil circuit respectively, the A port of the third switching valve (5) is connected to the first chamber, and the B port of the third switching valve (5) is connected to the second chamber.

5. The multi-stage speed regulating hydraulic system according to claim 4, characterized in that: The T port of the third switching valve (5) is connected to the oil return port of the oil tank.

6. The multi-stage speed regulating hydraulic system according to claim 2, characterized in that: The first throttling component (1) and the second throttling component (2) are throttle valves.

7. The multi-stage speed regulating hydraulic system according to claim 1, characterized in that: A pressure gauge (6) is provided at the inlet end of the first oil circuit and / or the second oil circuit.

8. The multi-stage speed regulating hydraulic system according to claim 1, characterized in that: One-way valves (7) are provided on the first oil circuit and the second oil circuit.

9. The multi-stage speed regulating hydraulic system according to claim 1, characterized in that: An overflow valve (8) is provided at the inlet end of the first oil circuit and / or the second oil circuit.

10. The multi-stage speed regulating hydraulic system according to claim 1, characterized in that: A pressure gauge (6) is provided at the inlet of the first chamber and / or the second chamber.

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