Oil cylinder pitching regeneration loop

Abstract

The utility model discloses an oil cylinder pitching regeneration loop which is communicated with a rodless cavity and a rod cavity of an oil cylinder and comprises a logic valve, two oil ports of the logic valve are respectively communicated with the rodless cavity and the rod cavity, and a control port of the logic valve is connected with an electromagnetic directional valve. The first throttling valve with the adjustable flow is connected between the logic valve and the rodless cavity; and the electromagnetic reversing valve reverses to enable oil in the rod cavity to enter the rodless cavity through the logic valve and the first throttling valve. According to the oil cylinder pitching regeneration loop, the flow of regenerated oil liquid can be adjusted through the throttling valve, and the requirements of different working conditions are met.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder control, and in particular to a hydraulic cylinder pitch regeneration circuit. Background Technology

[0002] In hydraulic systems, controlling the movement speed of the cylinder is extremely important. When the cylinder extends rapidly, a negative pressure is generated in the rodless chamber. Due to its large area, the rodless chamber requires a larger flow rate. Therefore, insufficient inlet flow can easily cause the cylinder to suck in dry air, damaging it.

[0003] In existing hydraulic regeneration circuits, a solenoid directional valve is typically added between the rodless and rod-side chambers of the cylinder. When the rodless chamber requires regeneration flow, the solenoid valve connects the rod-side and rodless chambers, ensuring that oil from the rod-side chamber can flow into the rodless chamber, thus satisfying the cylinder's rapid movement. However, this regeneration circuit cannot adjust the regeneration flow according to the cylinder's speed. Furthermore, existing regeneration circuits cannot be manually controlled, and if the solenoid directional valve fails, the regeneration circuit loses its function, which can also damage the cylinder. Utility Model Content

[0004] The technical problem to be solved by this utility model is: This utility model provides a hydraulic cylinder pitch regeneration circuit, which realizes the adjustable flow rate of regenerated oil through a throttle valve to meet different working conditions.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a hydraulic cylinder pitch regeneration circuit, connected to the rodless chamber and the rod chamber of the hydraulic cylinder, comprising:

[0006] A logic valve, wherein the two oil ports of the logic valve are respectively connected to the rodless chamber and the rod chamber, and the control port of the logic valve is connected to a solenoid directional valve;

[0007] A first throttle valve with adjustable flow rate, the first throttle valve being connected between the logic valve and the rodless chamber;

[0008] The electromagnetic reversing valve reverses the flow so that the oil in the rod chamber enters the rodless chamber through the logic valve and the first throttle valve.

[0009] Furthermore, in order to depressurize the rod chamber when the two oil ports of the logic valve are not connected, a second flow-adjustable throttle valve is provided between the rod chamber and the rodless chamber.

[0010] Furthermore, in order to achieve manual pressure relief, both the first throttle valve and the second throttle valve are manually operable throttle valves.

[0011] Furthermore, in order to control the switching of the logic valve, a shuttle valve is also included. The shuttle valve is connected to the rodless chamber, the rod chamber and the solenoid directional valve, and pressure is established at the control port of the logic valve through the solenoid directional valve.

[0012] Furthermore, the two pressure ports of the shuttle valve are connected to the rodless chamber and the rod chamber respectively, and the feedback port of the shuttle valve is connected to the port P of the solenoid directional valve.

[0013] Furthermore, in order to control the logic valve through the solenoid directional valve, the oil port A of the solenoid directional valve is connected to the control port of the logic valve, and the oil port T of the solenoid directional valve is connected to the return oil port T1.

[0014] Furthermore, to prevent the rodless chamber from communicating with port T, a pilot-operated check valve is connected between the electromagnetic directional valve and the rodless chamber. The first port of the pilot-operated check valve is connected to the rodless chamber, the second port is connected to port T, and the third port is connected to port A.

[0015] Furthermore, in order to enable one-way communication between the rodless chamber and the shuttle valve, a first check valve is connected between the rodless chamber and the pressure port of the shuttle valve.

[0016] Furthermore, the pressure port of the shuttle valve is also connected to the pilot port P1.

[0017] Furthermore, in order to enable one-way communication between the first throttle valve and the rodless chamber, a second check valve is also connected between the rodless chamber and the first throttle valve.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. The hydraulic cylinder pitch regeneration circuit of this utility model controls the operation of the logic valve by controlling the switching of the electromagnetic reversing valve, thereby realizing the regeneration of oil in the rodless chamber and realizing the manual adjustment function of the regeneration flow rate to meet different working conditions.

[0020] 2. In the hydraulic cylinder pitch regeneration circuit of this utility model, when the electromagnetic reversing valve fails, the rod chamber can be manually depressurized through the first throttle valve and the second throttle valve to avoid failure to regenerate due to electrical faults, thus improving safety. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of the hydraulic cylinder pitch regeneration circuit of this utility model;

[0023] In the diagram: 1. Hydraulic cylinder, 2. Logic valve, 3. Solenoid directional valve, 4. First throttle valve, 5. Second throttle valve, 6. Shuttle valve, 7. Pilot-operated check valve, 8. First check valve, 9. Second check valve. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] like Figure 1 As shown, a hydraulic cylinder pitch regeneration circuit is connected to the rodless chamber and the rod chamber of hydraulic cylinder 1. Hydraulic cylinder 1 achieves normal operation by allowing oil to enter and exit through the rodless chamber and the rod chamber.

[0028] The two ports of logic valve 2 are connected to the rodless chamber and the rod chamber, respectively, and the control port of logic valve 2 is connected to solenoid directional valve 3. When the pressure at the control port of logic valve 2 exceeds the spring force, logic valve 2 reverses, and the reversal of logic valve 2 disconnects the two ports of logic valve 2.

[0029] The oil port A of the solenoid directional valve 3 is connected to the control port of the logic valve 2. The oil port T of the solenoid directional valve 3 is connected to the return oil port T1, which is connected to the oil tank. The oil port P of the solenoid directional valve 3 is connected to the shuttle valve 6.

[0030] The solenoid directional valve 3 reverses the flow, allowing the oil in the rod chamber to flow through the logic valve 2 and the first throttle valve 4 into the rodless chamber. The first throttle valve 4 connects the logic valve 2 and the rodless chamber. A second check valve 9 is also connected between the rodless chamber and the first throttle valve 4 to prevent oil in the rodless chamber from flowing back to the logic valve 2. By adjusting the flow rate of the first throttle valve 4, the flow rate of the regenerated oil from the rod chamber to the rodless chamber can be controlled to meet different operating conditions.

[0031] A second flow-adjustable throttle valve 5 is also provided between the rod chamber and the rodless chamber.

[0032] Both the first throttle valve 4 and the second throttle valve 5 are manually operable throttle valves. When the two oil ports of the logic valve 2 are not connected, the rod chamber can be depressurized by manually opening the second throttle valve 5. That is, when the solenoid directional valve 3 fails, the pressure can be depressurized by manually opening the throttle valve, which is safer.

[0033] Shuttle valve 6 is connected to the rodless chamber, the rod chamber, and the solenoid directional valve 3, establishing pressure at the control port of logic valve 2 through the solenoid directional valve 3. The two pressure ports of shuttle valve 6 are connected to the rodless and rod chambers respectively, and the feedback port of shuttle valve 6 is connected to port P. The two ports of shuttle valve 6 compare the pressures of the rod and rodless chambers; the oil from the port with the higher pressure enters port P of the solenoid directional valve 3. The pressure ports of shuttle valve 6 are also connected to the pilot port P1. The external pilot pressure at pilot port P1 enters the solenoid directional valve 3 through the feedback port of shuttle valve 6 and then establishes pilot pressure at the control port of logic valve 2, thereby ensuring that logic valve 2 can switch directions.

[0034] A pilot-operated check valve 7 connects the solenoid directional valve 3 and the rodless chamber. The first port of the pilot-operated check valve 7 is connected to the rodless chamber, the second port is connected to port T of the solenoid directional valve 3, and the third port is connected to port A of the solenoid directional valve 3. When the pressure at the third port and the second port exceeds that at the first port, the oil in the pilot-operated check valve 7 cannot flow from the first port to the second port.

[0035] A first check valve 8 is connected between the rodless chamber and the pressure port of the shuttle valve 6. The first check valve 8 allows the oil in the rodless chamber to enter the shuttle valve 6, but the oil in the shuttle valve 6 will not flow back to the rodless chamber.

[0036] The specific working principle of the hydraulic cylinder pitch regeneration circuit of this utility model is as follows:

[0037] Under normal circumstances, the second throttle valve 5 is normally closed, the solenoid directional valve 3 is energized, and the pressure at the feedback port of the shuttle valve 6 comes from the rodless chamber and the rod chamber. The pressure at the control port acts on port A of the solenoid directional valve 3. Since port A is connected to the control port of the logic valve 2, the logic valve 2 reverses at this time, and the two ports of the logic valve 2 are no longer connected, that is, the rodless chamber and the rod chamber are no longer connected. At the same time, port A of the solenoid directional valve 3 is connected to the pilot-operated check valve 7, and the third port of the pilot-operated check valve 7 is closed to prevent the rodless chamber from connecting to port T, and the cylinder 1 works normally.

[0038] When cylinder 1 needs regeneration, the second throttle valve 5 remains normally closed. The rod chamber generates a load, and the rodless chamber generates a negative pressure. This prevents the cylinder from being damaged by cavitation due to insufficient oil flow in the rodless chamber. At this time, the solenoid directional valve 3 is de-energized, and its port A is connected to port T. This means that the control port of logic valve 2 is connected to port T. Since port T1 is connected to the oil tank, there is no pressure at the control port of logic valve 2, and logic valve 2 cannot switch directions. At this time, the connection between the two ports of logic valve 2 realizes the connection between the rod chamber and the rodless chamber. When pressure relief is needed, the first throttle valve 4 can be manually opened to relieve pressure in the rod chamber. At this time, the oil in the rod chamber flows back to the rodless chamber quickly through the first throttle valve 4. Simultaneously, the flow rate can be controlled by adjusting the opening of the first throttle valve 4 to achieve oil regeneration in the rodless chamber.

[0039] In summary, the hydraulic cylinder pitch regeneration circuit of this utility model achieves adjustable regeneration oil flow rate through a throttle valve, meeting the requirements of different working conditions.

[0040] The above description is based on the preferred embodiments of this utility model. Through the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. A hydraulic cylinder pitch regeneration circuit, connected to the rodless chamber and the rod chamber of a hydraulic cylinder (1), characterized in that, include: The logic valve (2) has two oil ports that are connected to the rodless chamber and the rod chamber respectively, and the control port of the logic valve (2) is connected to the solenoid directional valve (3). A first throttle valve (4) with adjustable flow rate is connected between the logic valve (2) and the rodless chamber; The electromagnetic reversing valve (3) reverses the flow so that the oil in the rod chamber enters the rodless chamber through the logic valve (2) and the first throttle valve (4).

2. The hydraulic cylinder pitch regeneration circuit according to claim 1, characterized in that, A second flow-adjustable throttle valve (5) is also provided between the rod chamber and the rodless chamber.

3. The hydraulic cylinder pitch regeneration circuit according to claim 2, characterized in that, Both the first throttle valve (4) and the second throttle valve (5) are throttle valves that can be opened manually.

4. The hydraulic cylinder pitch regeneration circuit according to claim 3, characterized in that, It also includes a shuttle valve (6), which is connected to the rodless chamber, the rod chamber and the solenoid directional valve (3), and establishes pressure on the control port of the logic valve (2) through the solenoid directional valve (3).

5. The hydraulic cylinder pitch regeneration circuit according to claim 4, characterized in that, The two pressure ports of the shuttle valve (6) are connected to the rodless chamber and the rod chamber respectively, and the feedback port of the shuttle valve (6) is connected to the port P of the solenoid directional valve (3).

6. The hydraulic cylinder pitch regeneration circuit according to claim 1, characterized in that, The oil port A of the electromagnetic reversing valve (3) is connected to the control port of the logic valve (2), and the oil port T of the electromagnetic reversing valve (3) is connected to the return oil port T1.

7. The hydraulic cylinder pitch regeneration circuit according to claim 6, characterized in that, A pilot-operated check valve (7) is connected between the electromagnetic directional valve (3) and the rodless chamber. The first port of the pilot-operated check valve (7) is connected to the rodless chamber, the second port is connected to port T, and the third port is connected to port A.

8. The hydraulic cylinder pitch regeneration circuit according to claim 7, characterized in that, A first check valve (8) is connected between the rodless chamber and the pressure port of the shuttle valve (6).

9. The hydraulic cylinder pitch regeneration circuit according to claim 8, characterized in that, The pressure port of the shuttle valve (6) is also connected to the pilot port P1.

10. The hydraulic cylinder pitch regeneration circuit according to claim 1, characterized in that, A second check valve (9) is also connected between the rodless chamber and the first throttle valve (4).

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