Stabilizing cable hydraulic control system

Abstract

The utility model provides a stable cable hydraulic control system which comprises a control valve assembly, a motor and an oil tank, the oil return end of the motor is connected with the oil tank through an oil return pipeline, the oil inlet end of the motor is connected with the oil tank through an oil inlet pipeline, an oil pump is arranged on the oil inlet pipeline, and the control valve assembly is arranged between the oil inlet end of the motor and the oil tank. The motor drives the cable stabilizing winch to wind and unwind the cable stabilizing cable; the control valve assembly comprises an overflow valve and a reversing valve, the P end of the overflow valve is connected with an oil inlet pipeline close to the oil inlet end of the motor, the T end of the overflow valve is connected with an oil return pipeline, the control end of the overflow valve is connected with the P end of the reversing valve, the T end of the reversing valve is connected with the oil tank, and the control end of the overflow valve is further connected with the oil inlet pipeline. According to the structure, back pressure is added to the oil inlet pipeline through the control valve assembly, the constant tension state can be kept between the cable stabilizing mooring rope and the heavy object, and therefore it is guaranteed that the heavy object is not prone to shaking.

Description

Technical Field

[0001] The utility model relates to the technical field of winch control systems, and particularly relates to a guy wire hydraulic control system. Background Art

[0002] A crane refers to a multi-action lifting machine that vertically lifts and horizontally transports heavy objects within a certain range. For some heavy cranes, if the tonnage of the lifted heavy object is too large and the heavy object shakes greatly during the lifting process, it may cause the heavy object to hit the crane boom, leading to safety accidents.

[0003] Therefore, to improve the safety of the crane when lifting heavy objects, when lifting heavy objects with too large a tonnage, a guy wire winch is usually installed on the crane, and the steel wire rope of the guy wire winch is connected to the heavy object. In the existing guy wire mechanisms, most of them set a fixed pulley on the crane boom as a fulcrum, so that the steel wire rope of the guy wire winch maintains a constant tension and increases stability. With this setting, when the crane lifts a heavy object, the steel wire rope of the guy wire winch will be driven by the heavy object and become loose. The steel wire rope of the guy wire winch is controlled to maintain a constant tension by retracting and releasing the steel wire rope of the guy wire winch, and the steel wire rope of the guy wire winch applies a certain balance force to the heavy object to reduce the shaking of the heavy object.

[0004] With the development of social industry, the application of hydraulics is becoming more and more important. In the existing constant tension hydraulic systems, some pump sources use open pumps and only have passive constant tension functions. This constant tension is actually only a kind of pressure protection and does not have an active constant tension function. However, a proportional valve can be added at the outlet of a closed pump to limit the output pressure of the pump. However, this method occupies more pumps, and each mechanism that requires constant tension needs at least 1 set of pumps, resulting in uneconomical operation.

[0005] To solve this technical problem, for example, in the patent document with the Chinese patent application number 201610153402.4 and the publication date of July 28, 2017, it discloses a constant tension hydraulic valve group, including a first overflow valve, a first ball valve, a second overflow valve, a proportional overflow valve, a differential pressure reducing valve, a balance valve, and a second ball valve. In this document, through a remote pressure regulating overflow valve, a common overflow valve, a proportional overflow valve for setting the constant tension value, and an externally controlled differential pressure reducing valve, multiple mechanisms share one oil source to achieve different constant tension controls for each mechanism, thereby realizing precise remote control of constant tension.

[0006] However, only a second ball valve is provided between the externally controlled differential pressure reducing valve and the proportional overflow valve in this document. After the second ball valve is opened, there will be no pressure difference between the externally controlled differential pressure reducing valve and the proportional overflow valve after they are connected, which easily causes the crane to be unstable when it stops and descends. Summary of the Invention

[0007] The utility model provides a guy wire hydraulic control system, which can enable the guy wire cable and the heavy object to be in a constant tension state, so as to ensure that the heavy object is not easy to shake.

[0008] To achieve the above object, the technical solution of the utility model is: a guy wire hydraulic control system, including a control valve assembly, a motor and an oil tank. The oil return end of the motor is connected to the oil tank through an oil return pipeline, and the oil inlet end of the motor is connected to the oil tank through an oil inlet pipeline. An oil pump is provided on the oil inlet pipeline, and a control valve assembly is provided between the oil inlet end of the motor and the oil tank. The motor drives the guy wire winch to wind and unwind the guy wire cable.

[0009] The control valve assembly includes an overflow valve and a reversing valve. The P end of the overflow valve is connected to the oil inlet pipeline near the oil inlet end of the motor, the T end of the overflow valve is connected to the oil return pipeline, the control end of the overflow valve is connected to the P end of the reversing valve, the T end of the reversing valve is connected to the oil tank, and the control end of the overflow valve is also connected to the oil inlet pipeline.

[0010] The control valve assembly further includes an electromagnetic reversing valve and an electro-hydraulic proportional overflow valve. The P end of the electromagnetic reversing valve is connected to the oil inlet pipeline, the T end of the electromagnetic reversing valve is connected to the oil tank, the A end of the electromagnetic reversing valve is connected to the control end of the reversing valve. An electro-hydraulic proportional overflow valve is provided between the T end of the reversing valve and the oil tank. The A end of the electro-hydraulic proportional overflow valve is connected to the T end of the reversing valve, and the B end of the electro-hydraulic proportional overflow valve is connected to the oil tank.

[0011] In the above structure, when the crane hoists a heavy object, by connecting the stabilizing cable to the heavy object and then pumping oil through an oil pump, at this time, the electromagnetic directional valve is not connected to the directional valve. The hydraulic oil in the fuel tank flows into the motor from the oil inlet end of the motor through the oil inlet pipe and flows back to the fuel tank from the oil return end of the motor to realize circulation, thereby driving the motor to rotate and driving the stabilizing cable winch to tighten the stabilizing cable, so that there is a certain constant tension between the stabilizing cable and the heavy object, thereby towing the heavy object and making it not easy to shake. At the same time, the hydraulic oil flowing to the motor flows through the oil inlet pipe to the control end of the overflow valve, causing the overflow valve to close. When the crane stops hoisting or lowering the heavy object, the electromagnetic directional valve is controlled to start and reverse, so as to connect the P port and the A port of the electromagnetic directional valve, so that the hydraulic oil in the oil inlet pipe flows through the electromagnetic directional valve to the control end of the directional valve, and then drives the directional valve to reverse, so that the P port of the directional valve is connected to the T port, thereby enabling the hydraulic oil flowing to the overflow valve to flow through the directional valve to the electro-hydraulic proportional overflow valve and back to the fuel tank, so as to give a standby pressure to the oil inlet pipe through the overflow valve and the electro-hydraulic proportional overflow valve. Thus, when the oil pressure in the motor is less than the pressure preset by the overflow valve, the pressure of the hydraulic oil cannot open the overflow valve, and the hydraulic oil in the motor cannot flow back to the fuel tank through the overflow valve, so that the motor can stop stably. When the oil pressure in the motor is greater than the pressure preset by the overflow valve, the overflow valve opens, and the motor reverses, causing the hydraulic oil to supply oil to the motor from the oil outlet pipe and flow into the oil inlet pipe, and finally flow back to the fuel tank through the overflow valve. At this time, the overflow valve gives a standby pressure to the hydraulic oil through the preset pressure, so that the motor can slowly reverse and lower the heavy object, thereby preventing the stabilizing cable from suddenly dropping rapidly and damaging the structure of the crane or the heavy object.

[0012] Further, the P port of the electromagnetic directional valve is connected to the oil inlet pipe through a pressure reducing valve. The oil inlet end of the pressure reducing valve is connected to the oil inlet pipe and the oil outlet pipe through a shuttle valve. The oil outlet end of the pressure reducing valve is connected to the P port of the electromagnetic directional valve.

[0013] With the above settings, the hydraulic oil pressure flowing into the control end of the directional valve through the electromagnetic directional valve is not too large due to the setting of the pressure reducing valve, thereby preventing damage to the directional valve.

[0014] Further, the first port of the shuttle valve is connected to the oil inlet pipe, the second port of the shuttle valve is connected to the oil outlet pipe, and the third port of the shuttle valve is connected to the oil inlet pipe of the pressure reducing valve.

[0015] With the above settings, the function of the shuttle valve enables the pipeline through which the hydraulic oil flows into the electromagnetic directional valve to be changed as needed.

[0016] Further, a balance valve group is also provided on the oil inlet pipeline. The balance valve group includes a balance overflow valve and a check valve. The oil inlet end of the balance overflow valve is connected to the oil inlet pipeline near the oil inlet end of the motor, and the oil outlet end of the balance overflow valve is connected to the oil inlet pipeline near the oil tank. The oil inlet end of the check valve is connected to the oil inlet pipeline of the balance overflow valve near the oil tank, and the oil outlet end of the check valve is connected to the oil inlet pipeline near the oil inlet end of the motor.

[0017] With the above settings, through the action of the balance valve group, the hydraulic oil can flow smoothly through the oil inlet pipeline into the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the hydraulic system of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0020] As Figure 1 shown, a guy wire hydraulic control system includes a control valve assembly, a motor 1 and an oil tank 2. The oil return end of the motor 1 is connected to the oil tank 2 through an oil return pipeline 12, and the oil inlet end of the motor 1 is connected to the oil tank through an oil inlet pipeline 11. An oil pump (not shown in the figure) is provided on the oil inlet pipeline 11. A control valve assembly is provided between the oil inlet end of the motor 1 and the oil tank 2. The motor 1 drives a guy wire winch 10 to wind and unwind a guy wire cable (not shown in the figure).

[0021] The control valve assembly includes a relief valve 31 and a directional control valve 32. The P port of the relief valve 31 is connected to the oil inlet pipeline 11 near the oil inlet end of the motor 1. The T port of the relief valve 31 is connected to the oil return pipeline 12. The control port X of the relief valve 31 is connected to the P port of the directional control valve 32. The T port of the directional control valve 32 is connected to the oil tank 2. The control port X of the relief valve 31 is also connected to the oil inlet pipeline 11.

[0022] The control valve assembly further includes an electromagnetic directional control valve 33 and an electro-hydraulic proportional relief valve 34. The P port of the electromagnetic directional control valve 33 is connected to the oil inlet pipeline 11. The T port of the electromagnetic directional control valve 33 is connected to the oil tank 2. The A port of the electromagnetic directional control valve 33 is connected to the control port K of the directional control valve 32. An electro-hydraulic proportional relief valve 34 is provided between the T port of the directional control valve 32 and the oil tank 2. The A port of the electro-hydraulic proportional relief valve 34 is connected to the T port of the directional control valve 32. The B port of the electro-hydraulic proportional relief valve 34 is connected to the oil tank 2.

[0023] The P port of the electromagnetic directional control valve 33 is connected to the oil inlet pipe through a pressure reducing valve 35. The oil inlet end of the pressure reducing valve 35 is connected to the oil inlet pipe 11 and the oil outlet pipe 12 through a shuttle valve 36. The oil outlet end of the pressure reducing valve 35 is connected to the P port of the electromagnetic directional control valve 33. The setting of the pressure reducing valve 35 ensures that the hydraulic oil pressure flowing into the control end K of the directional control valve 32 through the electromagnetic directional control valve 33 is not too high, thus preventing damage to the directional control valve.

[0024] The first port 361 of the shuttle valve 36 is connected to the oil inlet pipe 11, the second port 362 of the shuttle valve 36 is connected to the oil outlet pipe 12, and the third port 363 of the shuttle valve 36 is connected to the oil inlet pipe of the pressure reducing valve 35. The function of the shuttle valve 36 enables the pipeline through which the hydraulic oil flows into the electromagnetic directional control valve 33 to be changed as required.

[0025] A balance valve group 4 is also provided on the oil inlet pipe 11. The balance valve group includes a balance relief valve 41 and a check valve 42. The oil inlet end of the balance relief valve 41 is connected to the oil inlet pipe 11 near the oil inlet end of the motor 1, the oil outlet end of the balance relief valve 41 is connected to the oil inlet pipe 11 near the oil tank 2, the oil inlet end of the check valve 42 is connected to the oil inlet pipe 11 of the balance relief valve 41 near the oil tank 2, and the oil outlet end of the check valve 42 is connected to the oil inlet pipe 11 near the oil inlet end of the motor 1. The function of the balance valve group 4 enables the hydraulic oil to flow smoothly into the motor 1 through the oil inlet pipe 11.

[0026] Working principle of the utility model: When the crane hoists a heavy object, by connecting the stabilizing cable to the heavy object and then pumping oil through the oil pump. At this time, the electromagnetic directional valve 33 is not connected to the directional valve 32. The hydraulic oil in the oil tank 2 flows into the motor 1 from the oil inlet end of the motor 1 through the oil inlet pipeline 11 and flows back to the oil tank 2 from the oil return end of the motor 1 to realize circulation, thereby driving the motor 1 to rotate and driving the stabilizing cable winch to tighten the stabilizing cable, so that there is a certain constant tension between the stabilizing cable and the heavy object, thus towing the heavy object and making the heavy object not easy to shake. At the same time, the hydraulic oil flowing to the motor 1 flows through the oil inlet pipeline 11 to the control end X of the overflow valve 31, causing the overflow valve 31 to close. When the crane stops hoisting or lowering the heavy object, the electromagnetic directional valve 33 is controlled to start and reverse, so as to connect the P port and the A port of the electromagnetic directional valve 33, making the hydraulic oil in the oil inlet pipeline 11 flow through the electromagnetic directional valve 33 to the control end K of the directional valve 32, and then driving the directional valve 32 to reverse, so that the P port of the directional valve 32 is connected to the T port, thereby enabling the hydraulic oil flowing to the overflow valve 31 to flow through the directional valve 32 to the electro-hydraulic proportional overflow valve 34 and back to the oil tank, so as to give a standby pressure to the oil inlet pipeline 11 through the overflow valve 31 and the electro-hydraulic proportional overflow valve 34. Thus, when the oil pressure of the motor 1 is less than the pressure preset by the overflow valve 31, the pressure of the hydraulic oil cannot open the overflow valve 31, and the hydraulic oil in the motor 1 cannot flow back to the oil tank 2 through the overflow valve 31, so that the motor 1 can stop operating stably. When the oil pressure of the motor 1 is greater than the pressure preset by the overflow valve 31, the overflow valve 31 opens, and the motor 1 reverses, so that the hydraulic oil supplies oil to the motor 1 from the oil outlet pipeline 12 and flows into the oil inlet pipeline 11, and finally flows back to the oil tank 2 through the overflow valve 31. At this time, the overflow valve 31 gives a standby pressure to the hydraulic oil through the preset pressure, so that the motor 1 can slowly reverse and lower the heavy object, thereby preventing the stabilizing cable from suddenly dropping rapidly and damaging the structure of the crane or the heavy object.

Claims

1. A hydraulic control system for stabilizing cable, characterized in that: It includes a control valve assembly, a motor and an oil tank. The oil return end of the motor is connected to the oil tank through an oil return pipeline, and the oil inlet end of the motor is connected to the oil tank through an oil inlet pipeline. An oil pump is provided on the oil inlet pipeline. A control valve assembly is provided between the oil inlet end of the motor and the oil tank. The motor drives the stabilizing cable winch to retract and release the stabilizing cable. The control valve assembly includes a relief valve and a reversing valve, the P end of the relief valve is connected to the oil inlet pipeline close to the oil inlet end of the motor, the T end of the relief valve is connected to the oil return pipeline, the control end of the relief valve is connected to the P end of the reversing valve, the T end of the reversing valve is connected to the oil tank, and the control end of the relief valve is also connected to the oil inlet pipeline; The control valve assembly also includes an electromagnetic reversing valve and an electric proportional relief valve, wherein the P end of the electromagnetic reversing valve is connected to the oil inlet pipeline, the T end of the electromagnetic reversing valve is connected to the oil tank, the A end of the electromagnetic reversing valve is connected to the control end of the reversing valve, an electric proportional relief valve is provided between the T end of the reversing valve and the oil tank, the A end of the electric proportional relief valve is connected to the T end of the reversing valve, and the B end of the electric proportional relief valve is connected to the oil tank.

2. A cable stabilizing hydraulic control system according to claim 1, characterized in that: The P end of the electromagnetic reversing valve is connected to the oil inlet pipeline through a pressure reducing valve, the oil inlet end of the pressure reducing valve is connected to the oil inlet pipeline and the oil outlet pipeline through a shuttle valve, and the oil outlet end of the pressure reducing valve is connected to the P end of the electromagnetic reversing valve.

3. A cable stabilizing hydraulic control system according to claim 2, characterized in that: The first port of the shuttle valve is connected to the oil inlet pipeline, the second port of the shuttle valve is connected to the oil outlet pipeline, and the third port of the shuttle valve is connected to the oil inlet pipeline of the pressure reducing valve.

4. A cable stabilizing hydraulic control system according to claim 1, characterized in that: A balancing valve group is also provided on the oil inlet pipeline, and the balancing valve group includes a balancing overflow valve and a one-way valve. The oil inlet end of the balancing overflow valve is connected to the oil inlet pipeline close to the oil inlet end of the motor, and the oil outlet end of the balancing overflow valve is connected to the oil inlet pipeline close to the oil tank. The oil inlet end of the one-way valve is connected to the oil inlet pipeline of the balancing overflow valve close to the oil tank, and the oil outlet end of the one-way valve is connected to the oil inlet pipeline close to the oil inlet end of the motor.

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