A hydraulic system for protecting a winch

Abstract

The present invention provides a hydraulic system for protecting a winch, which includes an oil tank, an output valve group, an upper limit valve group, an overload valve group and a regulating valve group. The regulating valve group includes a hydraulic control reversing valve and a regulating shuttle valve. The P port of the hydraulic control reversing valve is connected to a multi-way valve through a three-way valve, and the control port of the hydraulic control reversing valve is connected to one end of the regulating shuttle valve; the A port of the hydraulic control reversing valve is connected to the output valve group, the T port of the hydraulic control reversing valve is connected to the oil tank, and the B port of the hydraulic control reversing valve is normally closed; the three-way valve is also connected to the upper limit valve group; with the above settings, the lifting limit and automatic oil discharge during overload of the winch are realized through the hydraulic control reversing valve, thereby ensuring the safety of the winch during operation.

Description

Technical Field

[0001] The present invention relates to the technical field of winch safety, and particularly relates to a hydraulic system for protecting a winch. Background Art

[0002] The marine crane is one of the main equipment on the offshore platform, mainly used for lifting equipment and transporting personnel. Due to the complex marine climate and environment, the working environment of the crane is harsh, and the crane is required to have high safety performance. The crane is equipped with multiple safety protection functions. Under normal circumstances, there will be no serious overload during operation. However, sometimes some unexpected situations may occur, such as the hook being entangled with a moving supply ship or encountering large waves, etc., which cause the load to increase rapidly, and the operator has no time to react. Without protection measures, it may drag the crane down or even cause serious consequences of machine damage and human casualties.

[0003] In the current hydraulic winch, its working principle is that when the limit bumper touches the rocker of the limit switch, the limit switch, which was originally in a conducting state (or open state), switches to an open state (or conducting state). The on-off of the limit switch controls the energization or de-energization of the solenoid valve in the hydraulic system, thereby controlling the unloading of the pressure oil and controlling the hydraulic oil in the entire hydraulic system to return to the oil tank, achieving the purpose of stopping the operation of the winch working circuit. Summary of the Invention

[0004] The present invention provides a hydraulic system for protecting a winch. Through the hydraulic system of the present invention, the winch can be protected from automatically stopping when the driving cable is hoisted to the upper limit or when overloaded, thereby reducing the occurrence of winch accidents.

[0005] To achieve the above object, the technical solution of the present invention is: a hydraulic system for protecting a winch, including an oil tank, an output valve group, an upper limit valve group, an overload valve group, and a regulating valve group. The regulating valve group includes a hydraulic control directional valve and a regulating shuttle valve. The P port of the hydraulic control directional valve is connected to a multi-way valve through a three-way valve, and the control port of the hydraulic control directional valve is connected to one end of the regulating shuttle valve; the A port of the hydraulic control directional valve is connected to the output valve group, the T port of the hydraulic control directional valve is connected to the oil tank, and the B port of the hydraulic control directional valve is normally closed; the three-way valve is also connected to the upper limit valve group.

[0006] The upper limit valve group includes a roller reversing valve. The P port of the roller reversing valve is connected to the three-way valve, the T port of the roller reversing valve is connected to the oil tank, the B port of the roller reversing valve is connected to the other end of the regulating shuttle valve, and the A port of the roller reversing valve is normally closed.

[0007] The overload valve group includes an overload sequence valve. One end of the overload sequence valve is connected to the output valve group, and the other end of the overload sequence valve is connected to the third end of the regulating shuttle valve.

[0008] In the above structure, when the winch is working, the multi-way valve outputs hydraulic oil to the output valve group for hoisting. When the winch hoists to the upper limit position, the roller reversing valve reverses, so that the P port of the roller reversing valve is connected to the B port. Thus, the hydraulic oil transported by the multi-way valve flows through the roller and then through the roller reversing valve to the regulating shuttle valve, opening the other end of the regulating shuttle valve. The hydraulic oil can then flow from one end of the regulating shuttle valve to the control port of the hydraulic control reversing valve, and further control the hydraulic control reversing valve to reverse through the hydraulic oil, so that the A port of the hydraulic control reversing valve is connected to the T port. Thus, the hydraulic oil flowing to the output valve group can flow back to the fuel tank through the hydraulic control reversing valve to realize oil discharge, stopping the winch from hoisting; thereby protecting the hoisting of the winch from exceeding the upper limit; when the winch hoists beyond the pressure value preset by the overload sequence valve, the overload sequence valve starts, so that a part of the hydraulic oil flowing to the output valve group flows through the overload sequence valve to the regulating shuttle valve, opening the third end of the regulating shuttle valve. The hydraulic oil can then flow from one end of the regulating shuttle valve to the control port of the hydraulic control reversing valve, and further control the hydraulic control reversing valve to reverse through the hydraulic oil, so that the A port of the hydraulic control reversing valve is connected to the T port. Thus, the hydraulic oil flowing to the output valve group can flow back to the fuel tank through the hydraulic control reversing valve to realize oil discharge, making the winch unable to hoist when overloaded. This ensures that the winch will not perform hoisting actions when overloaded, thus avoiding potential safety hazards during overloaded hoisting; the above settings realize the hoisting limit and automatic oil discharge when overloaded of the winch through the hydraulic control reversing valve, thereby ensuring the safety of the winch during operation.

[0009] Further, one end of the three-way valve is connected to the P port of the hydraulic control reversing valve, the other end of the three-way valve is connected to the multi-way valve, and the third end of the three-way valve is connected to the roller reversing valve. With this setting, the multi-way valve only needs one oil circuit to ensure the hydraulic oil output of the output valve group and the roller reversing valve, which is simple, convenient and saves materials.

[0010] Further, the output valve group includes a winch motor and a balance valve group. One end of the winch motor is connected to the A port of the hydraulic control reversing valve, the other end of the hydraulic motor is connected to the multi-way valve. A balance valve group is provided between the winch motor and the hydraulic control reversing valve. The oil discharge port of the winch motor is connected to the fuel tank, and one end of the winch motor is also connected to the overload sequence valve. With this setting, the winch realizes the hoisting of the cable through the winch motor.

[0011] Further, the balance valve group includes a balance check valve and a balance pressure reducing valve. One end of the balance pressure reducing valve is connected to the A port of the hydraulic control reversing valve, the other end of the balance pressure reducing valve is connected to the winch motor. One end of the balance check valve is connected to one end of the balance pressure reducing valve, and the other end of the balance check valve is connected to the other end of the balance pressure reducing valve. With this setting, through the action of the balance valve group, the pressure of the hydraulic oil flowing from the multi-way valve to the winch motor is ensured to be stable, solving the problem that the winch motor hoists abnormally due to unstable hydraulic oil pressure. Description of the Drawings

[0012] Figure 1 Schematic diagram of a hydraulic system for protecting a winch according to the present invention. Specific embodiments

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] As Figure 1 shown, a hydraulic system for protecting a winch includes an oil tank 1, an output valve group 2, an upper limit valve group, an overload valve group, and a regulating valve group 5. The regulating valve group 5 includes a hydraulic control directional valve 51 and a regulating shuttle valve 52. The P port of the hydraulic control directional valve 51 is connected to a multi-way valve 7 through a three-way valve 6. The control port X of the hydraulic control directional valve 51 is connected to one end 521 of the regulating shuttle valve 52. The A port of the hydraulic control directional valve 51 is connected to the output valve group 2. The T port of the hydraulic control directional valve 51 is connected to the oil tank 1, and the B port of the hydraulic control directional valve 51 is normally closed. The three-way valve 6 is also connected to the upper limit valve group.

[0015] The upper limit valve group includes a roller reversing valve 3. The P port of the roller reversing valve 3 is connected to the three-way valve 6. The T port of the roller reversing valve 3 is connected to the oil tank 1. The B port of the roller reversing valve 3 is connected to the other end 522 of the regulating shuttle valve 52, and the A port of the roller reversing valve 3 is normally closed.

[0016] The overload valve group includes an overload sequence valve 4. One end of the overload sequence valve 4 is connected to the output valve group 2, and the other end of the overload sequence valve 4 is connected to the third end 523 of the regulating shuttle valve 52.

[0017] In this embodiment, the overload sequence valve 4 sets a pressure value, which is 1.1 times the pressure of the hydraulic oil flowing from the multi-way valve 7 to the output valve group 2 under normal conditions. When the winch hoists a load, if the weight of the load is too heavy, it is easy to cause the load of the winch to increase rapidly. At this time, in order to hoist the load, the pressure of the hydraulic oil flowing from the multi-way valve 7 to the output valve group 2 will increase. When the pressure of the hydraulic oil exceeds the pressure value set by the overload sequence valve 4, the overload sequence valve 4 can be opened to control the hydraulic control directional valve 51 to change direction and achieve oil drainage.

[0018] In the above structure, when the winch is working, the multi-way valve 7 outputs hydraulic oil to the output valve group 2 for hoisting. When the winch hoists to the upper limit position, the roller reversing valve 3 reverses, so that the P port of the roller reversing valve 3 is connected to the B port. Thus, the hydraulic oil transported by the multi-way valve 7 flows through the roller reversing valve 3 to the regulating shuttle valve 52 to open the other end 522 of the regulating shuttle valve. The hydraulic oil can then flow from one end 521 of the regulating shuttle valve 52 to the control port X of the hydraulic control reversing valve 51, and further control the hydraulic control reversing valve 51 to reverse through the hydraulic oil, so that the A port of the hydraulic control reversing valve 51 is connected to the T port. Thus, the hydraulic oil flowing to the output valve group 2 can flow back to the oil tank 1 through the hydraulic control reversing valve 51 to achieve oil discharge, and the winch stops the hoisting action; thereby protecting the hoisting of the winch from exceeding the upper limit position.

[0019] When the hoisting of the winch exceeds the pressure value preset by the overload sequence valve 4, the overload sequence valve 4 starts, so that a part of the hydraulic oil flowing to the output valve group 2 flows through the overload sequence valve 4 to the regulating shuttle valve 52 to open the third end 523 of the regulating shuttle valve 52. The hydraulic oil can then flow from one end 521 of the regulating shuttle valve 52 to the control port X of the hydraulic control reversing valve 51, and further control the hydraulic control reversing valve 51 to reverse through the hydraulic oil, so that the A port of the hydraulic control reversing valve 51 is connected to the T port. Thus, the hydraulic oil flowing to the output valve group 2 can flow back to the oil tank 1 through the hydraulic control reversing valve 51 to achieve oil discharge, and the winch cannot hoist when overloaded. Thus, it is ensured that the winch will not perform the hoisting action when overloaded, thereby avoiding the potential safety hazard problems that may occur during overloaded hoisting; with the above settings, the hoisting limit of the winch and automatic oil discharge when overloaded are realized through the hydraulic control reversing valve 51, thereby ensuring the safety of the winch during operation.

[0020] One end of the three-way valve 6 is connected to the P port of the hydraulic control reversing valve 51, the other end of the three-way valve 6 is connected to the multi-way valve 7, and the third end of the three-way valve 6 is connected to the roller reversing valve 3. With this setting, the multi-way valve 7 only needs one oil circuit to ensure the hydraulic oil output of the output valve group 2 and the roller reversing valve, which is simple, convenient and saves materials.

[0021] The output valve group 2 includes a winch motor 21 and a balance valve group 22. One end of the winch motor 21 is connected to the A port of the hydraulic control reversing valve 51, and the other end of the winch motor is connected to the multi-way valve 7. A balance valve group 22 is provided between the winch motor 21 and the hydraulic control reversing valve 51. The oil discharge port 211 of the winch motor 21 is connected to the oil tank 1, and one end of the winch motor 21 is also connected to the overload sequence valve 4. With this setting, the winch hoists the cable through the winch motor.

[0022] In this embodiment, the multi-way valve group 7 is a control valve group between the fuel tank 1 and the output valve group 2. This control valve group is composed of common reversing valves. The forward or reverse rotation of the winch motor is controlled by the reversing valve to realize the lifting and lowering of the cable. The specific control method is prior art and will not be elaborated below.

[0023] In this embodiment, the multi-way valve group 7 is provided with a lifting port 71 and a lowering port 72. The lifting port 71 is connected to one end of the winch motor 21 through a pilot-operated reversing valve 51, and the lowering port 72 is connected to the other end of the winch motor 21. With this setting, when the cable needs to be lifted, the hydraulic oil flows from the lifting port 71 to one end of the winch motor 21, and then the hydraulic oil flows back to the fuel tank 1 from the oil discharge port 211 of the winch motor 21 to make the hydraulic oil circulate to realize the lifting action of the winch. When the cable needs to be lowered, the hydraulic oil flows from the lowering port 72 to the other end of the winch motor 21, and then the hydraulic oil flows back to the fuel tank 1 from the oil discharge port 211 of the winch motor 21 to make the hydraulic oil circulate to realize the lowering action of the winch.

[0024] The balance valve group 22 includes a balance check valve 221 and a balance pressure reducing valve 222. One end of the balance pressure reducing valve 222 is connected to the A end of the pilot-operated reversing valve 51, the other end of the balance pressure reducing valve 222 is connected to the winch motor 21, one end of the balance check valve 221 is connected to one end of the balance pressure reducing valve 222, and the other end of the balance check valve 221 is connected to the other end of the balance pressure reducing valve 222. With this setting, through the action of the balance valve group 22, the pressure of the hydraulic oil flowing from the multi-way valve 7 to the winch motor 21 is ensured to be stable, and the problem that the winch motor 21 cannot lift normally due to unstable hydraulic oil pressure is solved.

Claims

1. A hydraulic system for protecting a winch, characterized in that: It includes a fuel tank, an output valve group, an upper limit valve group, an overload valve group and a regulating valve group. The regulating valve group includes a pilot-operated directional valve and a regulating shuttle valve. The P port of the pilot-operated directional valve is connected to a multi-way valve through a three-way valve. The control port of the pilot-operated directional valve is connected to one end of the regulating shuttle valve. The A port of the pilot-operated directional valve is connected to the output valve group. The T port of the pilot-operated directional valve is connected to the fuel tank. The B port of the pilot-operated directional valve is normally closed. The three-way valve is also connected to the upper limit valve group. The upper limit valve group includes a roller reversing valve. The P port of the roller reversing valve is connected to the three-way valve. The T port of the roller reversing valve is connected to the fuel tank. The B port of the roller reversing valve is connected to the other end of the regulating shuttle valve. The A port of the roller reversing valve is normally closed. The overload valve group includes an overload sequence valve. One end of the overload sequence valve is connected to the output valve group. The other end of the overload sequence valve is connected to the third end of the regulating shuttle valve. One end of the three-way valve is connected to the P port of the pilot-operated directional valve. The other end of the three-way valve communicates with the multi-way valve. The third end of the three-way valve is connected to the roller reversing valve. The output valve group includes a winch motor and a balance valve group. One end of the winch motor is connected to the A port of the pilot-operated directional valve. The other end of the winch motor is connected to the multi-way valve. A balance valve group is provided between the winch motor and the pilot-operated directional valve. The oil discharge port of the winch motor is connected to the fuel tank. One end of the winch motor is also connected to the overload sequence valve.

2. The hydraulic system for protecting a winch according to claim 1, wherein: The balance valve group includes a balance check valve and a balance pressure reducing valve. One end of the balance pressure reducing valve is connected to the A port of the pilot-operated directional valve. The other end of the balance pressure reducing valve is connected to the winch motor. One end of the balance check valve is connected to one end of the balance pressure reducing valve. The other end of the balance check valve is connected to the other end of the balance pressure reducing valve.

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