Hydraulic differential loop of oil cylinder

Abstract

The utility model discloses a hydraulic differential loop of an oil cylinder, which comprises a first oil way, a second oil way and a third oil way, wherein the first oil way is used for communicating a rodless cavity of the oil cylinder with a hydraulic pump; the second oil way is used for communicating a rodless cavity of the oil cylinder with the hydraulic pump; a one-way throttle valve is arranged on a second oil way communicated with the rod cavity and the third oil way, the one-way throttle valve is formed by connecting a first one-way valve and a first throttle valve in parallel, and the first one-way valve controls oil in the second oil way to flow into the rod cavity of the oil cylinder in a one-way mode. According to the oil cylinder, the one-way throttle valve is arranged on the oil inlet main line of the rod cavity of the oil cylinder, the speed of oil in the rod cavity converging into the rodless cavity can be effectively regulated and controlled, impact is reduced, the one-way throttle valve is arranged on the main line, and the oil line structure is greatly simplified.

Description

Technical Field

[0001] The utility model relates to a hydraulic regulating device, in particular to an oil cylinder hydraulic differential circuit. Background Art

[0002] When the piston rod of the oil cylinder extends in place, the system enters the high-pressure closed stage. At this moment, the impact sound will obviously be emitted by the executing component of the oil cylinder. In actual operation, contact impact is inevitable. This kind of impact will directly damage the welded part of the connecting piece. Seriously, it will directly cause deformation and cracking of the welding position.

[0003] Methods to reduce the impact intensity can be adopted to protect the equipment. For example, a differential hydraulic system and a differential control method of a push plate disclosed in the invention patent application with the publication number of CN118208455A. In the oil circuits of the rodless cavity and the rod cavity of the oil cylinder, first three-way solenoid valves and second solenoid valves for controlling whether the control oil circuits are connected to the oil tank are arranged. Between the oil circuits of the rodless cavity and the rod cavity, a third solenoid valve for controlling the on-off of the two oil circuits and two one-way throttle valves are arranged. When the differential push of the push plate oil cylinder is started, the first reversing valve is controlled to be in the right position, the second reversing valve is controlled to be in the left position, and the third reversing valve is controlled to be in the right position. The pressure oil in the inlet oil circuit enters the rodless cavity of the push plate oil cylinder through the first reversing valve, so as to push the piston rod of the push plate oil cylinder to extend. The hydraulic oil in the rod cavity of the push plate oil cylinder enters the inlet oil circuit through the second reversing valve and also enters the rodless cavity of the push plate oil cylinder through the first reversing valve, so as to realize the differential variable acceleration drive to extend the piston rod of the push plate oil cylinder. The third reversing valve makes the hydraulic oil in the rodless cavity and the rod cavity of the push plate oil cylinder communicate with the return oil circuit through the throttle valve, thereby avoiding the starting impact caused by the step oscillation change of the speed when the push plate oil cylinder extends and starting, making the impact on the push plate small or no impact when the push plate oil cylinder extends and starting, and prolonging the service life of the push plate.

[0004] This scheme adopts multiple-position control valves and multiple one-way throttle valves, with complex pipelines and a complex control system. Content of the Utility Model

[0005] Purpose of the Utility Model: The purpose of the utility model is to provide an oil cylinder hydraulic differential circuit that can prevent impact and has a simple structure.

[0006] Technical Solution: An oil cylinder hydraulic differential circuit described in the utility model includes a first oil circuit for connecting the rodless cavity of the oil cylinder and the hydraulic pump, a second oil circuit for connecting the rod cavity of the oil cylinder and the hydraulic pump, and a third oil circuit for connecting the first oil circuit and the second oil circuit; a one-way throttle valve is arranged on the first oil circuit connecting the rod cavity and the third oil circuit. The one-way throttle valve is formed by parallel connection of a first one-way valve and a first throttle valve. The first one-way valve controls the unidirectional flow of the oil in the second oil circuit into the rod cavity of the oil cylinder.

[0007] In the present utility model, by providing a one-way throttle valve on the oil inlet main line of the rod chamber of the oil cylinder, the speed of the oil flowing from the rod chamber into the rodless chamber can be effectively regulated, reducing impact. The one-way throttle valve is provided on the main line, greatly simplifying the oil circuit structure.

[0008] Preferably, a first electromagnetic valve for controlling the on-off of the oil circuit and a second throttle valve are connected in series on the first oil line connecting the third oil circuit and the hydraulic pump.

[0009] Preferably, the first electromagnetic valve is a two-position three-way valve.

[0010] Preferably, a second electromagnetic valve for controlling the on-off of the oil circuit is connected in series on the second oil line connecting the third oil circuit and the hydraulic pump.

[0011] Preferably, the second electromagnetic valve is one of a two-position three-way valve, a one-way valve, and a normally open two-position two-way valve.

[0012] Preferably, a second one-way valve and a third electromagnetic valve are connected in series on the third oil line. The second one-way valve controls the one-way flow of the oil in the rod chamber into the rodless chamber.

[0013] Preferably, the third electromagnetic valve is a two-position two-way cut-off type reversing valve.

[0014] Preferably, for the convenience of connection with the hydraulic pump, the first oil line and the second oil line are connected to the hydraulic pump through a confluence oil line.

[0015] Beneficial effects: Compared with the prior art, the present utility model has the following advantages: 1. Effectively prevent impact and simple structure: Control and change the movement speed and flexibility of the piston rod of the hydraulic cylinder, and solve the impact hidden danger caused by the too fast speed when the piston rod of the hydraulic cylinder extends or retracts; 2. Simple operation, only need to control the opening and closing of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solution of the present utility model will be further described below with reference to the drawings.

[0018] The main valve body 1 includes: a one-way valve 2, a throttle valve 3, a one-way throttle valve 5, an electromagnetic valve 4, an electromagnetic valve 6, and an electromagnetic valve 7. The oil circuit for controlling the telescopic movement of the oil cylinder includes: a first oil line (the left branch in the figure) connecting the rodless chamber of the oil cylinder and the hydraulic pump, a second oil line (the right branch in the figure) connecting the rod chamber of the oil cylinder and the hydraulic pump, and a third oil line (the horizontal branch in the figure) connecting the first oil line and the second oil line.

[0019] The solenoid valve 4 is arranged on the first oil path connecting the third oil path and the hydraulic pump, and controls the on-off of the oil path between the rodless cavity and the hydraulic pump. The solenoid valve 4 is a two-position three-way valve. When it is energized, the hydraulic pump pumps oil into the rodless cavity. When it is de-energized, the oil in the rodless cavity returns to the fuel tank. The throttle valve 3 is arranged on the first oil path connecting the third oil path and the hydraulic pump, and is connected in series with the solenoid valve 4. When the rodless cavity is being filled with oil, it adjusts the oil inlet speed of the rodless cavity.

[0020] The solenoid valve 6 is arranged on the second oil path connecting the third oil path and the hydraulic pump, and controls the on-off of the oil path between the rod cavity and the hydraulic pump. When the solenoid valve 6, which is a two-position three-way valve, is de-energized, the oil path is connected. When it is energized, the oil path is disconnected. The solenoid valve 6 can also be a check valve or a normally open two-position two-way valve.

[0021] The check valve 2 and the solenoid valve 7 are arranged on the third oil path, and the two are connected in series. The solenoid valve 7 controls the on-off of the third oil path. The check valve 2 controls the unidirectional flow of the oil in the rod cavity into the rodless cavity. The check valve 2 is close to the first oil path, and the solenoid valve 7 is close to the second oil path. The solenoid valve 7 is a two-position two-way cut-off type reversing valve. When the electromagnet is not energized, it is bi-directionally cut off. When it is energized, it is bi-directionally flowing.

[0022] The one-way throttle valve 5 is arranged on the second oil path connecting the rod cavity and the third oil path, and is mainly composed of a throttle valve and a check valve connected in parallel. The check valve is used for the rod cavity to be filled with oil when the piston rod retracts, that is, to control the unidirectional flow of the oil in the second oil path into the rod cavity. The throttle valve is used when the piston rod extends to control the oil outflow speed of the rod cavity, and thus adjusts the oil filling speed of the rod cavity for the rodless cavity. The check valve 2 and the solenoid valve 7 are connected to the rod cavity through the one-way throttle valve 5.

[0023] When the piston rod retracts: The solenoid valves 4 and 6 are de-energized. The oil in the rodless cavity flows back to the fuel tank through the solenoid valve 4. The oil pumped by the hydraulic pump enters the rod cavity through the solenoid valve 6 and the check valve of the one-way throttle valve 5. The retraction speed of the piston rod is mainly controlled by the throttle valve 3 on the first oil path. When the piston rod of the oil cylinder reaches the maximum position, the rod cavity is still under pressure in the system, which can ensure that the iron plate reaches the lower position and is continuously sealed.

[0024] When the piston of the oil cylinder extends, the solenoid valves 4, 6, and 7 are energized. The hydraulic power oil reaches the rodless cavity of the oil cylinder through the solenoid valve 4. The oil in the rod cavity returns. The oil in the rod cavity passes through the throttle valve of the one-way throttle valve 5, the solenoid valve 7, and the check valve 2, and converges with the power oil on the first oil path to enter the rodless cavity, forming a differential circuit. The solenoid valve 6 prevents unloading.

[0025] When the piston rod extends, the throttle valve 3 cannot control the oil fluid velocity in the rod chamber. That is, a device for regulating the oil fluid flow rate needs to be added inside the differential circuit to reduce the extension speed and the impact intensity of the iron plate during the sealing operation. Thus, a one-way throttle valve 5 is added. During the extension process of the oil cylinder piston rod, the one-way throttle valve 5 plays a role in throttling inside the differential circuit, reducing the differential circuit flow rate. The extension speed and the impact sound are significantly improved, avoiding impacts during the high-pressure sealing stage. When the pressure is higher than 150 bar, the main pump stops loading. When the pressure is lower than 100 bar, the main pump loads to ensure that the hydraulic system pressure is between 100 - 150 bar.

Claims

1. A cylinder hydraulic differential circuit, characterized in that: The invention comprises a first oil circuit for connecting the rodless chamber of the oil cylinder and the hydraulic pump, a second oil circuit for connecting the rod chamber of the oil cylinder and the hydraulic pump, and a third oil circuit for connecting the first oil circuit and the second oil circuit; a one-way throttle valve (5) is provided on the second oil circuit connecting the rod chamber and the third oil circuit; the one-way throttle valve (5) is formed by connecting the first one-way valve and the first throttle valve in parallel; the first one-way valve controls the oil in the second oil circuit to flow into the rod chamber of the oil cylinder in one direction.

2. The cylinder hydraulic differential circuit according to claim 1, characterized in that: A first solenoid valve (4) and a second throttle valve (3) for controlling the on-off of the oil circuit are connected in series to the first oil circuit that communicates with the third oil circuit and the hydraulic pump.

3. The cylinder hydraulic differential circuit according to claim 2, characterized in that: The first solenoid valve (4) is a two-position three-way valve.

4. The cylinder hydraulic differential circuit according to claim 1, characterized in that: A second solenoid valve (6) for controlling the on-off of the oil circuit is connected in series to the second oil circuit that communicates with the third oil circuit and the hydraulic pump.

5. The cylinder hydraulic differential circuit according to claim 1, characterized in that: A second one-way valve (2) and a third solenoid valve (7) are connected in series in the third oil circuit, and the second one-way valve (2) controls the oil in the rod chamber to flow into the rodless chamber in one direction.

6. The cylinder hydraulic differential circuit according to claim 5, characterized in that: The third solenoid valve (7) is a two-position two-way stop-type reversing valve.

7. The cylinder hydraulic differential circuit according to claim 1, characterized in that: The first oil passage and the second oil passage are connected to the hydraulic pump via a converging oil passage.

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