A hydraulic control method for tensioning a steel wire rope

Abstract

The present invention provides a hydraulic control method for tensioning a wire rope, comprising: (1) winding one end of two wire ropes around two winches respectively and then fixing the other ends of the two wire ropes to two ends of a target object suspended on a hook; (2) the hook drives the target object to rise, and the winch reels in the rope; (3) after the target object is lifted to a preset position, the hydraulic pump stops pumping oil, and the target object is in a stationary state; (4) the hook drives the target object to descend, and the winch releases the rope. The present invention can flexibly adjust the oil circuit pressure according to the external load, and is easy to operate.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic technology, and in particular to a hydraulic control method for tensioning a steel wire rope. Background Art

[0002] With the development of social industry, the application of hydraulics is becoming more and more important. During the use of hydraulic winches, according to different working conditions, some winches need to apply pre-tightening force to achieve the expected effect. In order to solve this technical problem, such as the Chinese patent application number 202122838133.4 and the announcement date of 2022.05.27, a winch hydraulic system with adjustable tension is disclosed, including: a tension control valve group, a winch and a main pump station, and the winch is connected to the main pump station through the tension control valve group; the tension control valve group includes: a dual balancing circuit composed of a first balancing valve and a second balancing valve, which is used to provide power for the basic functions of the winch; a back pressure circuit composed of an externally controlled overflow valve, an on-off valve and an electric proportional overflow valve, which is used to provide pre-tightening force for the winch; a brake circuit composed of a shuttle valve, a one-way valve, a pressure reducing valve, a sequence valve, and a one-way throttle valve, which is used to power the brakes of the winch.

[0003] This document uses a main pump group to supply oil to two winches to reduce power consumption; the circuit back pressure provides pre-tightening force for the winch to prevent the winch from tangling the rope; the pressure of the back pressure circuit is adjusted by the pressure control valve, which has high adaptability; however, the tension control valve group in this document does not have a connected damper, so the flexibility of the oil circuit pressure adjustment is poor. Summary of the Invention

[0004] The object of the present invention is to provide a hydraulic control method for tensioning a steel wire rope, which can flexibly adjust the oil circuit pressure according to the external load and is easy to operate.

[0005] To achieve the above object, a hydraulic control method for tensioning a wire rope includes a multi-way valve, two winches, two constant tension control systems for controlling the winches, a first oil circuit, a hydraulic pump, and an oil tank;

[0006] The following steps are also included:

[0007] (1) Wind one end of the two steel wire ropes onto the two winches, and then fix the other ends of the two steel wire ropes to the two ends of the target object hanging on the hook;

[0008] (2) The hook drives the target object to rise, and the winch retracts the rope.

[0009] (2.1) The hydraulic oil is switched through the multi-way valve so that the hydraulic oil passes through the second shuttle valve and the first shuttle valve in turn to release the winch brake;

[0010] (2.2) Manually preset the pressure of the proportional relief valve according to the rate at which the hook rises, and simultaneously energize the second solenoid valve so that the proportional relief valve is connected to the two-way valve and the filter respectively;

[0011] (2.3) The hydraulic pump continuously pumps oil to increase the pressure in the oil circuit where the balancing valve is located, making the pressure at port A of the two-way valve greater than the sum of the pressure at the preset proportional relief valve and the pressure at the other end of the two-way valve. At this time, port A and port B of the two-way valve are connected, dividing the pressure in the oil circuit where the balancing valve is located, making the pressure in the oil circuit where the balancing valve is located the same as the pressure at the preset proportional relief valve, causing the oil at the other end of the winch to merge with the oil flowing through port B, and finally flowing back to the oil tank through the multi-way valve, causing the winch to rotate forward to retract the rope. The wire rope is in a tensioned state and rises synchronously with the target object.

[0012] (3) After the target object is lifted to the preset position, the hydraulic pump stops pumping oil and the target object is in a stationary state;

[0013] (4) The hook drives the target object down, and the winch releases the rope.

[0014] (4.1) Lower the target object and drive the wire rope on the winch to lower synchronously, while reversing the winch;

[0015] (4.2) Energize the second solenoid valve so that the proportional relief valve is connected to the two-way valve and the filter respectively;

[0016] (4.3) The reversal of the winch increases the pressure in the oil circuit between one end of the winch and the balancing valve, and decreases the pressure in the oil circuit between the other end of the winch and the valve port B of the two-way valve. When the pressure at the valve port A of the two-way valve is greater than the sum of the pressure of the preset proportional relief valve and the pressure at the other end of the two-way valve, the valve ports A and B of the two-way valve are connected again, causing the liquid oil in the balancing valve to flow out from the valve port B through the valve port A of the two-way valve and flow to the other end of the winch, forming a reverse circulation, so that the winch achieves balanced reversal. At this time, the wire rope in the winch is in a constant tension state and descends synchronously with the object.

[0017] The above setting, by setting a multi-way valve to connect with the oil tank, can make the liquid oil drive the winch brake to release first after the multi-way valve is switched, so that the winch can be driven to rotate by the liquid oil; and in the process of the hook driving the target object to rise, the winch is in the rope-retracting state, and the proportional relief valve is set to be connected to the two-way valve and the filter respectively, and at the same time, the pressure of the proportional relief valve is adjusted according to the rising rate of the hook. After the pressure at the valve port A of the two-way valve is greater than the sum of the pressure of the preset proportional relief valve and the pressure at the other end of the two-way valve, the valve port B of the two-way valve is connected to the other end of the winch, and the liquid oil flowing out of the balancing valve is divided, which can ensure that the pressure of the oil circuit where the balancing valve is located is the same as the pressure of the preset proportional relief valve and drive the winch to rotate, and the liquid oil at the other end of the winch converges at the valve port B of the two-way valve, and finally flows back to the oil tank through the reversing of the multi-way valve to form a complete circuit, thereby making The wire rope is in a tensioned state and rises synchronously with the target object; after the target object is lifted to the preset position, the target object no longer continues to rise, and the hydraulic pump stops pumping oil, thereby keeping the target object stationary; and in the process of the hook driving the target object to descend, the winch is in a rope-releasing state. During this process, the wire rope will pull the winch to reverse, which will increase the pressure in the oil circuit between one end of the winch and the balance valve, and reduce the pressure in the oil circuit between the other end of the winch and the B valve port of the two-way valve. When the pressure at the A valve port of the two-way valve is greater than the sum of the pressure of the preset proportional relief valve and the pressure at the other end of the two-way valve, and the A valve port and the B valve port of the two-way valve are connected again, the liquid oil in the balance valve flows out from the B valve port through the A valve port of the two-way valve and flows to the other end of the winch to form a reverse circulation, thereby achieving balanced reversal of the winch. At the same time, the wire rope in the winch is in a constant tensioned state and descends synchronously and stably with the object.

[0018] Furthermore, the constant tension control system includes a constant tension control oil circuit, which includes a balancing valve, a two-way valve, a second solenoid valve, two dampers, a filter and a proportional relief valve. The A valve port of the two-way valve, one end of the filter and one end of the winch are respectively connected to one end of the balancing valve, the other end of the filter is connected to the second solenoid valve through a damper, and the other end of the two-way valve is connected to the second solenoid valve through another damper. At the same time, the B valve port of the two-way valve is connected to the other end of the winch, and one end of the proportional relief valve is connected to the second solenoid valve. After the proportional relief valve is connected to the other end of the two-way valve through the second solenoid valve, when the oil pressure of the A valve port of the two-way valve is greater than the oil pressure of the proportional relief valve and the other end of the two-way valve, the A valve port of the two-way valve is connected to the B valve port, the other end of the proportional relief valve is connected to the oil tank, and the other end of the balancing valve is connected to the multi-way valve.

[0019] The above arrangement is to respectively connect the balancing valve with the filter and the two-way valve, and at the same time set a damping between the second solenoid valve and the filter and the two-way valve, and the proportional relief valve is simultaneously connected to the second solenoid valve. In this way, after the second solenoid valve is energized and connected, the proportional relief valve is respectively connected to the filter and the two-way valve, so that the oil pressure at the other end of the two-way valve is superimposed on the oil pressure of the proportional relief valve. Since the valve port A of the two-way valve is connected to the balancing valve, when the oil pressure in the valve port A is greater than the oil pressure at the other end of the two-way valve and the oil pressure of the proportional relief valve, the valve port A and the valve port B in the two-way valve are connected, and then the liquid oil flows through the two-way valve and then flows from one end of the winch to the other end of the winch, forming a balanced pressure difference, so that the winch achieves balanced output.

[0020] Furthermore, the step (2.1) also includes: when the liquid oil cannot drive the winch brake to release after passing through the second shuttle valve and the first shuttle valve in sequence, the first oil circuit is opened and the winch brake is forcibly driven to release through the first oil circuit.

[0021] The above arrangement can prevent the winch brake from being unable to release and causing the winch to be unable to be driven by liquid oil.

[0022] Furthermore, the other end of the balancing valve is also connected to one end of the second shuttle valve.

[0023] The above arrangement enables the oil to flow out of the multi-way valve and then flow into the second shuttle valve, thereby applying the brake to release the brake.

[0024] Furthermore, the other end of the winch is respectively connected to the balance valve, the other end of the second shuttle valve and the multi-way valve.

[0025] The above arrangement facilitates the oil in the oil circuit connected to the other end of the winch to flow back to the oil tank through the multi-way valve during the winch rope release process. At the same time, it can trigger the balancing valve to achieve conduction, so that the oil in the oil circuit connected to one end of the winch flows back to the multi-way valve through the balancing valve, and then flows back to the oil tank.

[0026] Furthermore, the first oil circuit includes a first shuttle valve, a first solenoid valve and a pressure reducing valve, one end of the pressure reducing valve is connected to the oil tank through a hydraulic pump, the other end of the pressure reducing valve is connected to one end of the first solenoid valve, the other end of the first solenoid valve is connected to one end of the first shuttle valve, the other end of the first shuttle valve is connected to the second shuttle valve, and the first shuttle valve is also connected to the brake of the winch.

[0027] The above arrangement can forcibly release the brake of the winch through the first oil circuit, thereby preventing the winch from being unable to rotate due to the brake being unable to be released.

[0028] Furthermore, the first solenoid valve is also connected to the other end of the proportional relief valve.

[0029] In the above arrangement, since the other end of the proportional relief valve is connected to the oil tank, after the first solenoid valve is electrically conductive, the excess oil in the pressure reducing valve can flow back to the oil tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0031] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0032] Figure 3 It is the overall workflow diagram of the present invention.

[0033] Figure 4 This is a flow chart of step (2) in the present invention.

[0034] Figure 5 This is a flow chart of step (3) in the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figures 1 to 2 As shown, a hydraulic control method for tensioning a wire rope includes a multi-way valve 1, two winches, two constant tension control systems for controlling the winches, a first oil circuit hydraulic pump 8 and an oil tank 4, wherein the P valve port at one end of the multi-way valve 1 is connected to the output end of the hydraulic pump 8, the input end of the hydraulic pump 8 is connected to the oil tank 4, the oil outlet R at one end of the multi-way valve 1 is connected to the oil tank 4, the other end of the multi-way valve 1 is respectively connected to two constant tension control systems, one constant tension control system 31 controls one winch 21, and the other constant tension control system 32 controls the other winch 22, and the two constant tension control systems simultaneously drive the two winches to rotate. In this embodiment, the multi-way valve 1 is prior art and will not be described here; the winch is installed on a slewing platform, and the wire rope on the winch passes around the pulley frame on the boom and is connected to both ends of the object suspended on the boom.

[0037] In this embodiment, the constant tension control system includes a constant tension control oil circuit 5, and the constant tension control oil circuit 5 includes a balancing valve 3, a two-way valve 51, a second solenoid valve 52, two dampers, a filter 53 and a proportional relief valve 54. In this embodiment, the second solenoid valve 52 is set as a two-way solenoid valve, and the two-way valve 51 is provided with an A valve port and a B valve port; the A valve port of the two-way valve, one end of the filter 53 and one end of the winch are respectively connected to one end of the balancing valve 3, and the other end of the filter 53 is connected to one end of the second solenoid valve 52 through a damper 55. The other end of the two-way valve 51 is connected to the second solenoid valve 52. It is connected to one end of the second solenoid valve 52 through another damper 56, and at the same time, the B valve port of the two-way valve 51 is connected to the other end of the winch, and one end of the proportional relief valve 54 is connected to the second solenoid valve 52. After the proportional relief valve 54 is connected to the other end of the two-way valve 51 through the second solenoid valve 52, when the oil pressure of the A valve port of the two-way valve 51 is greater than the oil pressure of the proportional relief valve 54 and the other end of the two-way valve 51, the A valve port of the two-way valve 51 is connected to the B valve port, the other end of the proportional relief valve 54 is connected to the oil tank 4, and the other end of the balancing valve 3 is connected to the C port at the other end of the multi-way valve 1.

[0038] In this embodiment, the first oil circuit includes a first shuttle valve 71, a first solenoid valve 72 and a pressure reducing valve 73. One end of the pressure reducing valve 73 is connected to the output end of the hydraulic pump 8, and the other end of the pressure reducing valve 73 is connected to one end of the first solenoid valve 72. The other end of the first solenoid valve 72 is connected to one end of the first shuttle valve 71, and the other end of the first shuttle valve 71 is connected to the second shuttle valve 2. The first shuttle valve 71 is also connected to the brake of the winch. In this way, the brake of the winch can be forcibly released in advance through the first oil circuit, thereby preventing the winch from being unable to rotate due to the inability to release the brake of the winch. In this embodiment, the first solenoid valve 72 is configured as a two-way solenoid valve. The first solenoid valve 72 is also connected to the other end of the proportional relief valve 54. Since the other end of the proportional relief valve 54 is connected to the oil tank 4, after the first solenoid valve 72 is conductively connected, the excess oil in the pressure reducing valve 73 can flow back to the oil tank 4.

[0039] like Figure 3-5 As shown, in this embodiment, a hydraulic control method for tensioning a wire rope further includes the following specific steps:

[0040] (1) Wind one end of the two steel wire ropes onto the two winches, and then fix the other ends of the two steel wire ropes to the two ends of the target object hanging on the hook;

[0041] (2) The hook drives the target object to rise, and the winch retracts the rope.

[0042] (2.1) The hydraulic oil is switched through the multi-way valve so that the hydraulic oil passes through the second shuttle valve and the first shuttle valve in sequence to release the winch brake. If the brake cannot be opened at this time, the first solenoid valve in the first oil circuit is energized, and the hydraulic pump pumps oil to the pressure reducing valve and directly drives the winch brake to release through the first shuttle valve;

[0043] (2.2) Manually preset the pressure of the proportional relief valve according to the rate at which the hook rises, and simultaneously energize the second solenoid valve so that the proportional relief valve is connected to the two-way valve and the filter respectively;

[0044] (2.3) The hydraulic pump continuously pumps oil to increase the pressure of the oil circuit where the balancing valve is located. In this embodiment, the pressure of the preset proportional relief valve is set to 45 bar, and the pressure at the other end of the two-way valve 5 is preset to 3.7 bar. After the pressure at the valve port A of the two-way valve is greater than the sum of the pressure of the preset proportional relief valve and the pressure at the other end of the two-way valve, which is 48.7 bar, the valve port A and the valve port B of the two-way valve are connected, and the pressure of the oil circuit where the balancing valve is located is divided, so that the pressure of the oil circuit where the balancing valve is located is the same as the pressure of the preset proportional relief valve and is maintained at 45 bar, so that the liquid oil at the other end of the winch merges with the liquid oil flowing through the valve port B, and finally flows back to the oil tank through the multi-way valve, so that the winch rotates forward to retract the rope, and the wire rope is in a tensioned state and rises synchronously with the target object;

[0045] (3) After the target object is lifted to the preset position, the hydraulic pump stops pumping oil and the target object is in a stationary state;

[0046] (4) The hook drives the target object down, and the winch releases the rope.

[0047] (4.1) Lower the target object and drive the wire rope on the winch to lower synchronously, while reversing the winch;

[0048] (4.2) Energize the second solenoid valve so that the proportional relief valve is connected to the two-way valve and the filter respectively;

[0049] (4.3) The reversal of the winch increases the pressure in the oil circuit between one end of the winch and the balancing valve, and decreases the pressure in the oil circuit between the other end of the winch and the valve port B of the two-way valve. When the pressure at the valve port A of the two-way valve is greater than the sum of the pressure of the preset proportional relief valve and the pressure at the other end of the two-way valve, which is 48.7 bar, the valve ports A and B of the two-way valve are connected again, causing the liquid oil in the balancing valve to flow out from the valve port B through the valve port A of the two-way valve and flow to the other end of the winch, forming a reverse circulation, so that the winch achieves balanced reversal. At this time, the wire rope in the winch is in a constant tension state and descends synchronously with the object.

Claims

1. A hydraulic control method for tensioning a wire rope, comprising a multi-way valve, two winches, two constant tension control systems for controlling the winches, a first oil circuit, a hydraulic pump, and an oil tank; characterized in that: The following steps are also included: (1) Wind one end of the two steel wire ropes onto the two winches, and then fix the other ends of the two steel wire ropes to the two ends of the target object hanging on the hook; (2) The hook drives the target object to rise, and the winch retracts the rope. (2.1) The hydraulic oil is switched through the multi-way valve so that the hydraulic oil passes through the second shuttle valve and the first shuttle valve in turn to release the winch brake; (2.2) Manually preset the pressure of the proportional relief valve according to the rate at which the hook rises, and simultaneously energize the second solenoid valve so that the proportional relief valve is connected to the two-way valve and the filter respectively; (2.3) The hydraulic pump continuously pumps oil to increase the pressure in the oil circuit where the balancing valve is located, making the pressure at port A of the two-way valve greater than the sum of the pressure at the preset proportional relief valve and the pressure at the other end of the two-way valve. At this time, port A and port B of the two-way valve are connected, dividing the pressure in the oil circuit where the balancing valve is located, making the pressure in the oil circuit where the balancing valve is located the same as the pressure at the preset proportional relief valve, causing the oil at the other end of the winch to merge with the oil flowing through port B, and finally flowing back to the oil tank through the multi-way valve, causing the winch to rotate forward to retract the rope. The wire rope is in a tensioned state and rises synchronously with the target object. (3) After the target object is lifted to the preset position, the hydraulic pump stops pumping oil and the target object is in a stationary state; (4) The hook drives the target object down, and the winch releases the rope. (4.1) Lower the target object and drive the wire rope on the winch to lower synchronously, while reversing the winch; (4.2) Energize the second solenoid valve so that the proportional relief valve is connected to the two-way valve and the filter respectively; (4.3) The reversal of the winch increases the pressure in the oil circuit between one end of the winch and the balancing valve, and decreases the pressure in the oil circuit between the other end of the winch and the valve port B of the two-way valve. When the pressure at the valve port A of the two-way valve is greater than the sum of the pressure of the preset proportional relief valve and the pressure at the other end of the two-way valve, the valve ports A and B of the two-way valve are connected again, causing the liquid oil in the balancing valve to flow out from the valve port B through the valve port A of the two-way valve and flow to the other end of the winch, forming a reverse circulation, so that the winch achieves balanced reversal. At this time, the wire rope in the winch is in a constant tension state and descends synchronously with the object.

2. The hydraulic control method for tensioning a steel wire rope according to claim 1, characterized in that: The constant tension control system includes a constant tension control oil circuit, which includes a balancing valve, a two-way valve, a second solenoid valve, two dampers, a filter and a proportional relief valve. The valve port A of the two-way valve, one end of the filter and one end of the winch are respectively connected to one end of the balancing valve, the other end of the filter is connected to the second solenoid valve through a damper, and the other end of the two-way valve is connected to the second solenoid valve through another damper. At the same time, the valve port B of the two-way valve is connected to the other end of the winch, and one end of the proportional relief valve is connected to the second solenoid valve. After the proportional relief valve is connected to the other end of the two-way valve through the second solenoid valve, when the oil pressure of the valve port A of the two-way valve is greater than the oil pressure of the proportional relief valve and the other end of the two-way valve, the valve port A of the two-way valve is connected to the valve port B, the other end of the proportional relief valve is connected to the oil tank, and the other end of the balancing valve is connected to the multi-way valve.

3. The hydraulic control method for tensioning a steel wire rope according to claim 1, characterized in that: The step (2.1) further includes: when the liquid oil fails to drive the winch brake to release after passing through the second shuttle valve and the first shuttle valve in sequence, the first oil circuit is opened and the winch brake is forcibly driven to release through the first oil circuit.

4. The hydraulic control method for tensioning a steel wire rope according to claim 2, characterized in that: The other end of the balancing valve is also connected to one end of the second shuttle valve.

5. The hydraulic control method for tensioning a steel wire rope according to claim 2, characterized in that: The other end of the winch is respectively connected to the balance valve, the other end of the second shuttle valve and the multi-way valve.

6. The hydraulic control method for tensioning a steel wire rope according to claim 1, characterized in that: The first oil circuit includes a first shuttle valve, a first solenoid valve and a pressure reducing valve. One end of the pressure reducing valve is connected to the oil tank through a hydraulic pump, and the other end of the pressure reducing valve is connected to one end of the first solenoid valve. The other end of the first solenoid valve is connected to one end of the first shuttle valve, and the other end of the first shuttle valve is connected to the second shuttle valve. The first shuttle valve is also connected to the brake of the winch.

7. The hydraulic control method for tensioning a steel wire rope according to claim 6, characterized in that: The first solenoid valve is also connected to the other end of the proportional relief valve.

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