Hydraulic winch emergency lowering circuit

Abstract

The present application relates to the field of hydraulic pressure, and particularly relates to an emergency lowering circuit of a hydraulic winch, which comprises an oil port A, an oil port B, an oil port R, a hydraulic control reversing valve one, a manual reversing valve, a manual pump, a shuttle valve one, a shuttle valve two, a pressure reducing valve, a hydraulic control reversing valve two, a balance valve, a hydraulic winch and a reversing valve; two ends of a pipeline one where the oil port A is located are connected with the reversing valve and the hydraulic winch respectively, two ends of a pipeline two where the oil port B is located are connected with the reversing valve and the hydraulic winch respectively, a pipeline three and a pipeline four are arranged between the pipeline one and the pipeline two, the shuttle valve one is arranged on the pipeline three, the hydraulic control reversing valve and the balance valve are arranged on the pipeline four; the shuttle valve one is connected with a pipeline six through a pipeline five, the shuttle valve two is arranged on the pipeline five, the shuttle valve two is connected with the pressure reducing valve, the hydraulic control reversing valve and the hydraulic winch in sequence; the manual pump, the manual reversing valve and the hydraulic control reversing valve are connected in sequence on the pipeline six. When power failure or oil supply pump failure occurs, the emergency lowering of the hydraulic winch can be carried out without power supply or solving the failure.

Description

Technical Field

[0001] This invention relates to the field of hydraulics, and more specifically to an emergency lowering circuit for a hydraulic winch. Background Technology

[0002] A hydraulic winch is a device used for lifting heavy objects, powered by a hydraulic motor. For example, Chinese patent CN111533017A discloses a fully hydraulic winch with a free-lowering function. The winch frame includes a left and right frame support plate that are parallel to each other. The drum body is located between the left and right frame support plates. The drum body has a built-in hydraulic clutch and a planetary gear reducer. A hydraulic motor is fixed to the outer surface of the right frame support plate, and a hydraulic brake is fixed to the inner surface of the right frame support plate. The output end of the hydraulic motor is connected to the power input end of the hydraulic brake. A bearing is installed on the outer wall of the hydraulic brake housing, and the outer ring of the bearing abuts against the inner wall of the right end of the drum body. The power output end of the planetary gear reducer is connected to the power input end of the hydraulic clutch. This winch has a compact structure, allows for full-speed lowering of the empty hook, and improves the winch's efficiency. Hydraulic winches require a hydraulic oil supply for both lifting and lowering heavy objects. If a power outage or oil pump malfunctions, the winch cannot lower the object from a high position, potentially causing a safety accident. Therefore, it is necessary to design an emergency lowering circuit for the hydraulic winch to address this problem. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and to propose an emergency lowering circuit for a hydraulic winch that can lower the hydraulic winch in the event of a power outage or oil pump failure without the need for power supply or troubleshooting.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] An emergency lowering circuit for a hydraulic winch includes oil port A, oil port B, oil port R, a hydraulically controlled directional valve one, a manual directional valve, a manual pump, a shuttle valve one, a shuttle valve two, a pressure reducing valve, a hydraulically controlled directional valve two, a balance valve, a hydraulic winch, and a directional valve. Both ends of pipeline one, where oil port A is located, are connected to the directional valve and the hydraulic winch, respectively. Both ends of pipeline two, where oil port B is located, are connected to the directional valve and the hydraulic winch, respectively. Pipelines three and four are provided between pipelines one and two. Pipeline three is equipped with... There is a shuttle valve 1, and a hydraulically controlled directional valve 1 and a balance valve are installed on pipeline 4; shuttle valve 1 is connected to pipeline 6 through pipeline 5, and shuttle valve 2 is installed on pipeline 5. Shuttle valve 2 is connected in series with pressure reducing valve, hydraulically controlled directional valve 2, and hydraulic winch; a manual pump, a manual directional valve, and hydraulically controlled directional valve 1 are connected in series on pipeline 6; pipeline 5 is connected to pipeline 6; the manual directional valve is connected to pipeline 7, one end of pipeline 7 is connected to oil port R, and the other end is connected to pressure reducing valve and hydraulically controlled directional valve 2.

[0006] In the above technical solution, the winch can operate normally when the manual pump is not pressurized and the manual directional valve is in its initial position. When an emergency descent is required, the balance valve is opened via the hydraulically controlled directional valve. Specifically, during an emergency descent, the manual pump switches the manual control valve to the left position, pressurizes the pump to release the winch brake, and opens the balance valve. The higher the pressure provided by the manual pump, the faster the descent speed. If the descent speed is too fast, the manual directional valve can be appropriately closed to slow down the descent. The hydraulic circuit design of this invention is reasonable, and the normal and emergency modes of the winch can be switched with simple adjustments.

[0007] Furthermore, the connection point between pipeline five and pipeline six is ​​located between the manual directional valve and the hydraulic directional valve one.

[0008] Furthermore, the manual directional valve is connected to the position of the pipeline near the oil port R.

[0009] Furthermore, both oil port A and oil port B are oil inlets.

[0010] Furthermore, the oil port R is an oil drain port.

[0011] Furthermore, the manual pump is connected to the HP interface. In case of emergency lowering, the manual pump is connected to the HP port, and the manual control valve is switched to the left position. The manual pump is pressurized to release the winch brake.

[0012] Technical effects of the present invention:

[0013] Compared with existing technologies, the present invention provides an emergency lowering circuit for a hydraulic winch. This circuit controls the opening pressure of the hydraulic winch's balance valve and uses a hand pump to release the hydraulic winch's brakes and generate opening pressure, thereby enabling the hydraulic winch to safely and controllably descend under the weight of the load. The emergency lowering circuit of this invention includes a hydraulic winch, a balance valve, a shuttle valve, a pressure reducing valve, a hydraulically controlled directional valve, and a manual directional valve. It is mainly used in automated oilfield drill pipe conveying devices (also known as power catwalks). When the equipment experiences a power outage or a hydraulic system malfunction causing the winch to hold the drill pipe at a high position, the hydraulic winch can be lowered in an emergency without requiring power or troubleshooting, ensuring the safety of personnel and equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the emergency lowering circuit structure of the hydraulic winch of the present invention.

[0015] In the diagram, the following valves are listed: 1. Hydraulic directional valve 1; 2. Manual directional valve 2; 3. Manual pump; 4. Shuttle valve 1; 5. Shuttle valve 2; 6. Pressure reducing valve; 7. Hydraulic directional valve 2; 8. Balance valve; 9. Hydraulic winch; 10. Directional valve; 11. Pipeline 1; 12. Pipeline 2; 13. Pipeline 3; 14. Pipeline 4; 15. Pipeline 5; 16. Pipeline 6; 17. Pipeline 7; 18. Port A; 19. Port B; 20. Port R. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0017] Example 1:

[0018] like Figure 1 As shown, this embodiment relates to an emergency lowering circuit for a hydraulic winch, including oil port A18, oil port B19, oil port R20, hydraulic control directional valve 1, manual directional valve 2, manual pump 3, shuttle valve 4, shuttle valve 5, pressure reducing valve 6, hydraulic control directional valve 7, balance valve 8, hydraulic winch 9, and directional valve 10; oil port A18 and oil port B19 are both oil inlets, and oil port R20 is an oil drain port.

[0019] The two ends of the pipeline 11 where oil port A18 is located are connected to the reversing valve 10 and the hydraulic winch 9, respectively. The two ends of the pipeline 12 where oil port B19 is located are connected to the reversing valve 10 and the hydraulic winch 9, respectively.

[0020] Pipeline 13 and pipeline 14 are provided between pipeline 11 and pipeline 2. Pipeline 13 is equipped with shuttle valve 4, and pipeline 14 is equipped with hydraulic control directional valve 1 and balance valve 8.

[0021] The shuttle valve 4 is connected to the pipe 6 via pipe 5 15. Shuttle valve 2 5 is installed on pipe 5 15. Shuttle valve 2 5 is connected in series with pressure reducing valve 6, hydraulic directional valve 2 7, and hydraulic winch 9. The manual pump 3, manual directional valve 2, and hydraulic directional valve 1 are connected in series on pipe 6 16. The manual pump 3 is connected to the HP interface. In emergency lowering, the manual directional valve 2 is switched to the left position by connecting the manual pump 3 to the HP interface, and the manual pump 3 pressurizes to release the winch brake.

[0022] Pipeline 5 15 is connected to pipeline 6 16, and the connection point between pipeline 5 15 and pipeline 6 16 is located between manual directional valve 2 and hydraulic directional valve 1; manual directional valve 2 is connected to pipeline 7 17, one end of pipeline 7 17 is connected to oil port R20, and the other end is connected to pressure reducing valve 6 and hydraulic directional valve 2 7; manual directional valve 2 is connected to pipeline 7 17 near oil port R20.

[0023] Working principle:

[0024] In the initial position, the hydraulic control directional valve 1 of this invention allows oil to enter through port B, enabling the hydraulic winch to lift the load; oil enters through port A, enabling the hydraulic winch to lower the load. During both lifting and lowering, the high-pressure oil circuit passes through shuttle valve 4, shuttle valve 5, pressure reducing valve 6, and hydraulic control directional valve 7 to the winch brake to release the brake. Lifting and lowering can only proceed after the brake is released. The balance valve 8 is a standard configuration for winches, generally used to ensure smooth lowering of the winch and to lock the hydraulic winch when the load is lifted to a certain height, preventing the load from falling. This, along with the brake, forms a double safety measure to prevent the hoisted object from falling.

[0025] In case of emergency lowering, the winch lifts the heavy object off the ground. Under the weight of the object, during emergency lowering, the manual pump 3 is connected to the HP port to pressurize. The pressure enters the shuttle valve 2 5 through the internal channel of the valve, and then enters the pressure reducing valve 6 through the channel. This pressure then pushes the hydraulic control directional valve 2 7. Under the pressure, the valve core of the hydraulic control directional valve 2 7 moves to the left. After the valve core moves to the left, the pressure reduced by the pressure reducing valve 6 enters the non-spring chamber of the hydraulic winch brake. Under the pressure, the spring is compressed, and the hydraulic winch brake is released. Another path enters the hydraulic control directional valve 1 through the channel, pushing the valve core upward. The pressure oil is loaded into the pilot chamber of the balance valve 8. After reaching the opening pressure, the balance valve 8 opens. The two oil supply ports A18 and B of the hydraulic winch are connected inside the directional valve 10. Under the action of gravity, the hydraulic winch oil supply circuit forms an internal circulation. The greater the opening pressure generated by the manual pump 3, the greater the opening degree generated by the balance valve 8, and the faster the weight is lowered. The opening pressure can be adjusted by adjusting the opening degree of the manual directional valve 2.

[0026] The function of manual directional valve 2 is to open the oil supply channel of manual pump 3 and to drain oil from the left end of shuttle valve 2 5 and hydraulic directional valve 1 when the hydraulic winch is working normally, so that the pressure oil generated by manual pump 3 can enable the winch to release the brake normally. Pressure reducing valve 6 and hydraulic directional valve 2 7 drain oil through port R.

[0027] The function of hydraulic directional valve 1 is: under normal operation, to provide oil from the main pipeline to the pilot chamber of balance valve 8; in emergency mode, to provide oil from manual pump 3 to the pilot chamber of balance valve 8.

[0028] The function of shuttle valve 25 is to allow high-pressure oil from the right side to enter the brake and release the brake in normal mode, and high-pressure oil from the left side of manual pump 3 to enter the brake through shuttle valve 25 in emergency mode.

[0029] The function of pressure reducing valve 6 is to open the brake after the high-pressure oil is reduced, so that the winch brake can be engaged within a safe pressure range, avoiding the impact of pressure fluctuations. The function of hydraulic control directional valve 7 is to allow the hydraulic oil in the winch brake to return to the oil tank through the drain port R20 when the winch stops working.

[0030] The above-described specific embodiments are merely specific examples of the present invention. The patent protection scope of the present invention includes, but is not limited to, the above-described specific embodiments. Any appropriate changes or modifications made by a person skilled in the art that conform to the claims of the present invention should fall within the patent protection scope of the present invention.

Claims

1. An emergency lowering circuit for a hydraulic winch, characterized in that: This includes oil port A, oil port B, oil port R, hydraulic control directional valve one, manual directional valve, manual pump, shuttle valve one, shuttle valve two, pressure reducing valve, hydraulic control directional valve two, balance valve, hydraulic winch, and directional valve; both ends of pipeline one, where oil port A is located, are connected to the directional valve and the hydraulic winch, respectively; both ends of pipeline two, where oil port B is located, are connected to the directional valve and the hydraulic winch, respectively; pipeline three and pipeline four are provided between pipeline one and pipeline two; shuttle valve one is installed on pipeline three. Hydraulic directional valve 1 and balance valve are installed on pipeline 4; shuttle valve 1 is connected to pipeline 6 via pipeline 5, shuttle valve 2 is installed on pipeline 5, shuttle valve 2 is connected in series with pressure reducing valve, hydraulic directional valve 2, and hydraulic winch; a manual pump, manual directional valve, and hydraulic directional valve 1 are connected in series on pipeline 6; pipeline 5 is connected to pipeline 6; the manual directional valve is connected to pipeline 7, one end of pipeline 7 is connected to oil port R, and the other end is connected to pressure reducing valve and hydraulic directional valve 2; The connection between pipeline five and pipeline six is ​​located between the manual directional valve and the hydraulic directional valve one; The manual reversing valve is connected to the position of the oil port R in pipeline seven; In case of emergency lowering, the winch lifts the load off the ground. Under the weight of the load, the manual pump is connected to the HP port to pressurize the load. The pressure enters the shuttle valve two through the internal channel, then the pressure reducing valve, and finally pushes the hydraulic directional valve two. Under the pressure, the valve core of the hydraulic directional valve two moves to the left. After the valve core moves to the left, the pressure reduced by the pressure reducing valve enters the non-spring chamber of the hydraulic winch brake. Under the pressure, the spring is compressed, releasing the hydraulic winch brake. Another path enters the hydraulic directional valve one through the channel, pushing the valve core upward. The pressurized oil is loaded into the pilot chamber of the balance valve. After reaching the opening pressure, the balance valve opens the two oil supply ports of the hydraulic winch, namely oil port A and oil port B, which are connected inside the directional valve. Under the action of gravity, the hydraulic winch oil supply circuit forms an internal circulation. The greater the opening pressure generated by the manual pump, the greater the opening degree of the balance valve, and the faster the load is lowered. The opening pressure can be adjusted by adjusting the opening degree of the manual directional valve.

2. The hydraulic winch emergency lowering circuit according to claim 1, characterized in that: Both oil port A and oil port B are oil inlets.

3. The hydraulic winch emergency lowering circuit according to claim 1, characterized in that: The oil port R is the oil drain port.

4. The hydraulic winch emergency lowering circuit according to any one of claims 1-3, characterized in that: The manual pump is connected to the HP interface.

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