Differential control system of oil cylinder

Abstract

The utility model discloses a differential control system of an oil cylinder, which comprises a valve block mounted on the oil cylinder and internally provided with a balance valve, a first one-way valve and a hydraulic control one-way valve; the hydraulic pump is used for providing a power source for the telescopic movement of the oil cylinder; the electromagnetic reversing valve is connected with the hydraulic pump; wherein a first port of the balance valve is connected with a rod cavity of the oil cylinder, a second port of the balance valve is connected with a rodless cavity of the oil cylinder, a third port of the balance valve is a pilot port, and a fourth port of the balance valve is connected with an inlet of the first one-way valve; an outlet of the first one-way valve is connected with a rod cavity of the oil cylinder; one end of the hydraulic control one-way valve is connected with the oil tank, and the other end of the hydraulic control one-way valve is connected with the oil cylinder rodless cavity. Differential control is achieved through mutual cooperation of the four-port balance valve, the first one-way valve and the hydraulic control one-way valve, no electrical element is involved, and the hydraulic control device can be used in the underwater environment along with an oil cylinder.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to a differential control system of an oil cylinder. Background Art

[0002] Cylinder differential control systems are primarily used in applications where rapid cylinder extension is required. This connects the rod chamber and the rodless chamber, allowing for a lower flow rate to increase cylinder extension speed. Existing differential control systems primarily rely on a solenoid directional valve mounted on the cylinder. While this works well in conventional applications, existing differential control systems are unsuitable for underwater or electrical environments. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides a differential control system for an oil cylinder, which realizes differential motion by a pure hydraulic control method and can be applied to underwater environments or environments where electrical components cannot be present.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a differential control system of an oil cylinder, comprising:

[0005] A valve block is mounted on the oil cylinder and is provided with a balancing valve, a first one-way valve and a hydraulically controlled one-way valve;

[0006] A hydraulic pump, which is used to provide a power source for the telescopic movement of the oil cylinder;

[0007] an electromagnetic reversing valve connected to the hydraulic pump;

[0008] Among them, the first port of the balancing valve is connected to the rod chamber of the oil cylinder, the second port of the balancing valve is connected to the rodless chamber of the oil cylinder, the third port of the balancing valve is a pilot port, and the fourth port of the balancing valve is connected to the inlet of the first one-way valve; the outlet of the first one-way valve is connected to the rod chamber of the oil cylinder; one end of the hydraulically controlled one-way valve is connected to the oil tank, and the other end of the hydraulically controlled one-way valve is connected to the rodless chamber of the oil cylinder.

[0009] Furthermore, it also includes: a pressure reducing valve, wherein a first port of the pressure reducing valve is connected to the electromagnetic reversing valve, a second port of the pressure reducing valve is connected to the hydraulic pump, and a third port of the pressure reducing valve is connected to the oil tank.

[0010] Furthermore, it also includes: a proportional relief valve, the proportional relief valve is connected to the fourth port of the pressure reducing valve, and the proportional relief valve is connected to the oil tank.

[0011] Furthermore, a first overflow valve is provided in the valve block, wherein a first port of the first overflow valve is connected to the rod chamber of the oil cylinder, and a second port of the first overflow valve is connected to the rodless chamber of the oil cylinder.

[0012] Furthermore, a second overflow valve is provided in the valve block, wherein a first port of the second overflow valve is connected to the rodless cavity of the oil cylinder, and a second port of the second overflow valve is connected to the rod cavity of the oil cylinder.

[0013] Furthermore, it also includes: an accumulator, which is connected to the second port of the pressure reducing valve.

[0014] Furthermore, a second one-way valve is provided between the second port of the pressure reducing valve and the hydraulic pump.

[0015] Furthermore, it also includes: a third overflow valve, a first port of the third overflow valve is connected to the inlet of the second one-way valve, and a second port of the third overflow valve is connected to the oil tank.

[0016] The beneficial effect of the present invention is that the present invention adopts a four-port balancing valve, a first one-way valve and a hydraulically controlled one-way valve to cooperate with each other to realize differential control, without involving electrical components, and can be used together with the oil cylinder in an underwater environment. The four-port balancing valve allows the oil to flow freely from the second port to the first port, and with the assistance of the pilot, the oil can flow from the first port to the second port. The third port is the pilot port, and the fourth port can return oil separately. The electromagnetic reversing valve is used to change the flow direction of the oil, and the hydraulic pump is connected to the oil tank to provide hydraulic power. The present invention realizes differential by means of pure hydraulic control through structural improvement, and can be suitable for use in underwater environments. For the rapid retraction of the oil cylinder with a large area ratio, the hydraulically controlled one-way valve can share part of the flow, which is conducive to reducing the specifications of the electromagnetic reversing valve and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural diagram of the differential control system of the utility model.

[0019] Figure 2 It is a structural diagram of the balancing valve of the present utility model.

[0020] Figure 3 It is a structural schematic diagram of the valve block of the utility model.

[0021] Figure 4 It is a structural schematic diagram of the pressure reducing valve of the present utility model.

[0022] In the figure: 1. Balancing valve; 2. First one-way valve; 3. Hydraulic-controlled one-way valve; 4. Hydraulic pump; 5. Solenoid reversing valve; 6. Pressure reducing valve; 7. Proportional relief valve; 8. First relief valve; 9. Second relief valve; 10. Accumulator; 11. Second one-way valve; 12. Third relief valve. DETAILED DESCRIPTION

[0023] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0026] like Figures 1 to 4As shown, the differential control system for the oil cylinder of the present invention includes: a valve block, a hydraulic pump 4, and an electromagnetic reversing valve 5. The valve block is mounted on the oil cylinder and is equipped with a balancing valve 1, a first non-return valve 2, and a hydraulically controlled non-return valve 3. The hydraulic pump 4 is used to provide a power source for the telescopic movement of the oil cylinder. The electromagnetic reversing valve 5 is connected to the hydraulic pump 4. Among them, the first port of the balancing valve 1 is connected to the rod chamber of the oil cylinder, the second port of the balancing valve 1 is connected to the rodless chamber of the oil cylinder, the third port of the balancing valve 1 is a pilot port, the fourth port of the balancing valve 1 is connected to the inlet of the first non-return valve 2, and the outlet of the first non-return valve 2 is connected to the rod chamber of the oil cylinder. One end of the hydraulically controlled non-return valve 3 is connected to the oil tank, and the other end of the hydraulically controlled non-return valve 3 is connected to the rodless chamber of the oil cylinder.

[0027] That is to say, the utility model adopts a four-port balancing valve 1, a first one-way valve 2 and a hydraulically controlled one-way valve 3 to cooperate with each other to realize differential control. No electrical components are involved, and it can be used together with the oil cylinder in an underwater environment. The four-port balancing valve 1 allows the oil to flow freely from the second port to the first port. With the assistance of the pilot, the oil can flow from the first port to the second port. The third port is the pilot port, and the fourth port can return oil separately. The electromagnetic reversing valve 5 (not installed on the oil cylinder and will not enter underwater) is used to change the direction of oil flow, and the hydraulic pump 4 is connected to the oil tank to provide hydraulic power. The utility model realizes differential through structural improvement and adopts a pure hydraulic control method, which can be suitable for use in underwater environments. For the rapid retraction of the oil cylinder with a large area ratio, the hydraulically controlled one-way valve 3 can share part of the flow, which is conducive to reducing the specifications of the electromagnetic reversing valve 5 and saving costs.

[0028] Specifically, the differential control system also includes a pressure reducing valve 6, a proportional relief valve 7, and an accumulator 10. The first port of the pressure reducing valve 6 is connected to the electromagnetic reversing valve 5, the second port of the pressure reducing valve 6 is connected to the hydraulic pump 4, the third port of the pressure reducing valve 6 is connected to the oil tank, the proportional relief valve 7 is connected to the fourth port of the pressure reducing valve 6, the proportional relief valve 7 is connected to the oil tank, and the accumulator 10 is connected to the second port of the pressure reducing valve 6. When the cylinder is operating normally and stopped at a certain intermediate position, a certain pressure needs to be maintained. In this case, the pressure reducing valve 6 can adjust the cylinder pressure to a fixed value. The pilot port (i.e., the fourth port) of the pressure reducing valve 6 is connected to the proportional relief valve 7. Due to different working media, the required tension of the cylinder varies. In this case, the proportional relief valve 7 can be used to adjust the appropriate pressure. When the cylinder pressure is high, oil can be drained through the third port of the pressure reducing valve 6. When the cylinder pressure is low, the accumulator 10 can be used to replenish the pressure. The combination of the pressure reducing valve 6 and the proportional relief valve 7 can achieve constant tension control of the cylinder.

[0029] The differential control system further includes a third relief valve 12, a first port of which is connected to the inlet of the second one-way valve 11, and a second port of which is connected to the oil tank. When the output pressure of the hydraulic pump 4 is too high, oil can be drained through the third relief valve 12.

[0030] The valve block also houses a first relief valve 8 and a second relief valve 9. The first port of the first relief valve 8 is connected to the rod chamber of the cylinder, while the second port is connected to the rodless chamber. The first port of the second relief valve 9 is connected to the rodless chamber of the cylinder, while the second port is connected to the rod chamber of the cylinder. The first relief valve 8 limits the maximum pressure in the rod chamber of the cylinder, while the second relief valve 9 limits the maximum pressure in the rodless chamber of the cylinder, thus protecting the cylinder.

[0031] Working principle:

[0032] During differential cylinder extension: Y2 of solenoid directional valve 5 is energized in the parallel position (P to A), allowing oil to enter the rodless chamber of the cylinder. Simultaneously, pressure builds up at the third port of counterbalance valve 1. Due to the area ratio between the third port and the first port of counterbalance valve 1, the third port can be opened at very low pressure, causing the cylinder to extend. The oil in the rod chamber of the cylinder cannot flow back to the tank due to the action of first check valve 2. Instead, it flows through counterbalance valve 1 to the rodless chamber, achieving differential cylinder extension.

[0033] When the cylinder retracts quickly: Y1 of the electromagnetic reversing valve 5 is energized and in the cross position (P to B), the oil can enter the rod chamber of the cylinder through the first one-way valve 2. Since the pressure setting value of the balancing valve 1 is high, under low pressure conditions, the third port of the balancing valve 1 cannot be opened, and the oil cannot flow into the rodless chamber through the balancing valve 1, and the cylinder retracts.

[0034] In summary, the differential control system of the present invention adopts a four-port balancing valve 1, a first one-way valve 2 and a hydraulically controlled one-way valve 3 to cooperate with each other to realize differential control. No electrical components are involved, and it can be used together with the oil cylinder in an underwater environment. The four-port balancing valve 1 allows the oil to flow freely from the second port to the first port. With the assistance of the pilot, the oil can flow from the first port to the second port. The third port is the pilot port, and the fourth port can return oil separately. The electromagnetic reversing valve 5 is used to change the flow direction of the oil, and the hydraulic pump 4 is connected to the oil tank to provide hydraulic power. The present invention realizes differential by means of pure hydraulic control through structural improvement, and can be suitable for use in underwater environments. For the rapid retraction of the oil cylinder with a large area ratio, the hydraulically controlled one-way valve 3 can share part of the flow, which is conducive to reducing the specifications of the electromagnetic reversing valve 5 and saving costs.

[0035] Based on the above-described preferred embodiments of the present invention, and in accordance with the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A differential control system for an oil cylinder, characterized in that: include: A valve block, the valve block being mounted on the oil cylinder, wherein a balancing valve (1), a first one-way valve (2) and a hydraulically controlled one-way valve (3) are provided in the valve block; A hydraulic pump (4), the hydraulic pump (4) is used to provide a power source for the telescopic movement of the oil cylinder; an electromagnetic reversing valve (5), the electromagnetic reversing valve (5) being connected to the hydraulic pump (4); The first port of the balancing valve (1) is connected to the rod chamber of the oil cylinder, the second port of the balancing valve (1) is connected to the rodless chamber of the oil cylinder, the third port of the balancing valve (1) is a pilot port, and the fourth port of the balancing valve (1) is connected to the inlet of the first one-way valve (2); the outlet of the first one-way valve (2) is connected to the rod chamber of the oil cylinder; one end of the hydraulically controlled one-way valve (3) is connected to the oil tank, and the other end of the hydraulically controlled one-way valve (3) is connected to the rodless chamber of the oil cylinder.

2. The differential control system of the oil cylinder according to claim 1, characterized in that: Also includes: A pressure reducing valve (6), wherein a first port of the pressure reducing valve (6) is connected to the electromagnetic reversing valve (5), a second port of the pressure reducing valve (6) is connected to the hydraulic pump (4), and a third port of the pressure reducing valve (6) is connected to the oil tank.

3. The differential control system of the oil cylinder according to claim 2, characterized in that: It also includes a proportional relief valve (7), the proportional relief valve (7) is connected to the fourth port of the pressure reducing valve (6), and the proportional relief valve (7) is connected to the oil tank.

4. The differential control system of the oil cylinder according to claim 1, characterized in that: A first overflow valve (8) is also provided in the valve block, wherein a first port of the first overflow valve (8) is connected to the rod chamber of the oil cylinder, and a second port is connected to the rodless chamber of the oil cylinder.

5. The differential control system of the oil cylinder according to claim 1, characterized in that: A second overflow valve (9) is also provided in the valve block, wherein a first port of the second overflow valve (9) is connected to the rodless cavity of the oil cylinder, and a second port is connected to the rod cavity of the oil cylinder.

6. The differential control system of the oil cylinder according to claim 3, characterized in that: Also includes: An accumulator (10) is connected to the second port of the pressure reducing valve (6).

7. The differential control system of the oil cylinder according to claim 6, characterized in that: A second one-way valve (11) is further provided between the second port of the pressure reducing valve (6) and the hydraulic pump (4).

8. The differential control system of the oil cylinder according to claim 7, characterized in that: Also includes: A third overflow valve (12), wherein a first port of the third overflow valve (12) is connected to the inlet of the second one-way valve (11), and a second port of the third overflow valve (12) is connected to the oil tank.

Images