An emergency operation method based on crane winch

Abstract

The present invention provides an emergency operation method based on a crane winch, which switches the three-way ball valve to an electric emergency state so that the emergency solenoid valve is energized, thereby connecting the hydraulic oil in the hydraulic oil tank to the winch through the emergency solenoid valve, releasing the brake of the winch, allowing the winch to drive the winch-loaded heavy object to descend, and controlling the descending speed through a throttle valve. If the electric emergency state cannot be started, the three-way ball valve is switched to a manual emergency state, and the manual pump is manually opened to connect the hydraulic oil in the hydraulic oil tank to the winch through the manual pump, thereby releasing the brake of the winch, allowing the winch to drive the winch-loaded heavy object to descend, and controlling the descending speed through the throttle valve. In this way, in both the electric emergency and manual emergency states, it is ensured that the winch can be quickly controlled to lower the load heavy object, thereby avoiding safety hazards caused by accidental misoperation to on-site operators.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, and in particular to an emergency operation method based on a crane winch. Background Art

[0002] Pile-encircling slewing cranes are used on offshore platforms for lifting cargo for transportation due to their advantages such as small platform space occupation, compact structure and large lifting capacity. Pile-encircling slewing cranes mainly include a base, a slewing platform, a lifting mechanism and a hydraulic system. The slewing platform is rotatably arranged on the base, and the lifting mechanism is arranged on the slewing platform. Usually, in small pile-encircling slewing cranes, the slewing platform and the base are connected by a slewing bearing, while in large pile-encircling slewing cranes, the slewing platform and the base are connected by rollers.

[0003] In the crane, an emergency operating system needs to be set up according to the operation requirements to avoid suspending the operation in special circumstances, thereby ensuring safety. For example, the patent document with Chinese patent number 201721645201.2 and announcement date 2018.07.03 discloses a crane emergency operating system, including a PLC automatic control system, an emergency manual system, a luffing system for driving a luffing winch, a main lifting system for driving a main lifting winch, a secondary main lifting system for driving a secondary main lifting winch, a slewing system for driving a slewing mechanism, a main motor, and a plurality of auxiliary motors. Machine, main pump, hydraulic oil tank, emergency stop system and safety protection system, the main motor drives the main pump, the main pump is connected to the hydraulic oil tank, the main oil supply pipeline formed at the output end of the main pump supplies oil to the luffing system, main lifting system, auxiliary main lifting system and rotary system respectively through the hydraulically controlled proportional multi-way valve, the PLC automatic control system controls the hydraulically controlled proportional multi-way valve through the electric proportional pressure reducing valve group; the emergency manual system includes an emergency pump group and a hydraulic handle connected to the hydraulic oil tank, the emergency pump group controls the luffing system, main lifting system, auxiliary main lifting system and rotary system through the hydraulic handle.

[0004] The emergency pump group in the above-mentioned document controls the multi-way valve between the hydraulic handle and the electric proportional pressure reducing valve through the seventh shuttle valve, thereby supplying oil to the motor. However, during the operation, when the emergency control winch lowers the load to the ground, the system connection is complex and the response is slow. In this way, the winch is not controlled in time to lower the load, and other personnel on the scene may accidentally trigger the operation, thereby posing a safety hazard to the on-site workers. Summary of the Invention

[0005] The purpose of the present invention is to provide an emergency operation method based on a crane winch, which can quickly control the winch to lower the load heavy objects through electric or manual emergency operation, has a fast response speed, meets the requirements of on-site operations, has a simple structure, and has low cost of use.

[0006] To achieve the above object, the present invention provides a crane winch emergency operation method, comprising the following steps:

[0007] When the motor pump group connected to the winch in the loaded state stops working, S1 opens the ball valve 1 connected to the hydraulic oil tank, the ball valve 2 connected to the three-way ball valve, the ball valve 3 connected to the second brake, the ball valve 4 connected to the throttle oil circuit, and the ball valve 5 in the throttle oil circuit, and at the same time closes the ball valve 6 connected to the winch;

[0008] S2 opens the throttle valve in the throttle oil circuit and turns the throttle valve knob to the minimum value to enter the electric emergency state, and then proceed to steps S3 to S4. If the electric emergency state cannot be activated, then enter the manual emergency state and proceed to steps S5 to S6.

[0009] S3 turns the three-way ball valve to the electric emergency state, starts the electric emergency release pump, energizes the emergency solenoid valve, and then adjusts the knob of the throttle valve to control the lowering speed of the load on the winch;

[0010] S4 When the load on the winch is lowered to the ground, the emergency solenoid valve is closed, so that the emergency solenoid valve group loses power, and the electric emergency state ends and exits;

[0011] S5 puts the three-way ball valve into the manual emergency state, opens the manual pump, and then adjusts the knob of the throttle valve to control the descending speed of the load on the winch;

[0012] S6 When the load on the winch is lowered to the ground, the manual pump is turned off and the manual emergency state ends.

[0013] The above setting can prepare for the emergency operation oil circuit by closing and opening different ball valves, and at the same time can open the second brake, release the brake of the winch by the second brake, and then turn on the electric emergency state through the three-way ball valve to energize the emergency solenoid valve, thereby connecting the hydraulic oil in the hydraulic oil tank to the winch through the emergency solenoid valve, releasing the brake of the winch, allowing the winch to drive the winch load to descend, and controlling the descent speed through the throttle valve. If the electric emergency state cannot be started, the three-way ball valve can be turned to the manual emergency state, and the manual pump can be opened manually to connect the hydraulic oil in the hydraulic oil tank to the winch through the manual pump, thereby releasing the brake of the winch, allowing the winch to drive the winch load to descend, and controlling the descent speed through the throttle valve. In this way, in the dual emergency states of electric emergency and manual emergency, it is ensured that the winch can be quickly controlled to lower the load, thereby avoiding accidental operation to cause safety hazards to the on-site workers.

[0014] Furthermore, one end of the ball valve 1 is connected to the hydraulic oil tank, and the other end of the ball valve 1 is connected to the electric emergency release pump group and the manual pump respectively.

[0015] With the above arrangement, after opening ball valve 1, the hydraulic oil in the hydraulic oil tank can enter the electric emergency release pump unit and the manual pump through ball valve 1.

[0016] Furthermore, the P valve port of the emergency solenoid valve is connected to the electric emergency release pump, the A valve port and the C valve port of the emergency solenoid valve are both connected to the T valve port of the multi-way valve, the T valve port of the multi-way valve is connected to one end of ball valve three, the other end of ball valve three is connected to the second brake, and the B valve port of the emergency solenoid valve is connected to the three-way ball valve.

[0017] The above setting enables the hydraulic oil to flow into the multi-way valve through the emergency solenoid valve, and then control the second brake through the ball valve three to release the brake on the winch.

[0018] Furthermore, the manual pump is connected to a three-way ball valve.

[0019] The above setting allows the hydraulic oil to enter the winch after passing through the three-way ball valve.

[0020] Furthermore, one end of the ball valve four is respectively connected to the D valve port of the multi-way valve and one end of the reversing valve, the other end of the ball valve four is respectively connected to one end of the throttling oil circuit and the E port of the motor connected to the winch, the other end of the throttling oil circuit is connected to one end of the three-way interface, the other end of the three-way interface is connected to the F port of the motor, the third end of the three-way interface is connected to one end of the shuttle valve, the other end of the shuttle valve is connected to one end of the reversing valve, and the other end of the reversing valve is connected to the first brake.

[0021] With the above arrangement, when the hydraulic oil drives the motor to rotate, the hydraulic oil flowing through the three-way interface pushes the shuttle valve, which is then connected to the reversing valve, causing the reversing valve to reverse, so that the first brake releases the winch brake, thereby realizing the rotation of the winch and driving the load to be lowered.

[0022] Furthermore, the throttling oil circuit includes a throttle valve, an unadjustable flow valve and a ball valve five, which are connected in series. The unadjustable flow valve is connected to one end of the three-way interface, and the ball valve five is respectively connected to the motor E port and the other end of the ball valve four.

[0023] The above setting can adjust the amount of hydraulic oil passing through the throttle oil circuit through the throttle valve, thereby controlling the lowering speed of the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of local hydraulic connection in the present invention.

[0025] Figure 2 This is another partial hydraulic connection schematic diagram in the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-2 As shown, a crane winch emergency operation method includes a hydraulic oil tank 1, a ball valve T17, an electric emergency release pump H22, an emergency solenoid valve T17, a three-way ball valve T15, a manual pump H18, a multi-way valve H19, a first brake 2, a second brake 3, a throttle oil circuit 4, a reversing valve 5 and a winch 6. One end of the ball valve H17 is connected to the hydraulic oil tank 1, and the other end of the ball valve H17 is respectively connected to one end of the electric emergency release pump H22 and one end of the manual pump H18. In this way, after opening the ball valve H17, the hydraulic oil in the hydraulic oil tank 1 can enter the electric emergency release pump group H22 and the manual pump H18 through the ball valve H17.

[0028] The P valve port of the emergency solenoid valve T17 is connected to the other end of the electric emergency release pump H22, the A valve port and the C valve port of the emergency solenoid valve T17 are both connected to the T valve port of the multi-way valve H19, the T valve port of the multi-way valve H19 is connected to one end of the ball valve three T16, the other end of the ball valve three T16 is connected to the second brake 3, and the B valve port of the emergency solenoid valve T17 is connected to the three-way ball valve T15. In this way, the hydraulic oil in the hydraulic oil tank 1 flows into the multi-way valve H19, and then by controlling the flow of the hydraulic oil flowing through the ball valve three T16, the flow of the hydraulic oil to the second brake 3 can be controlled, and then the hydraulic oil pressure reaching the second brake 3 is controlled, so that the second brake 3 releases the brake on the winch 6.

[0029] The other end of the manual pump H18 is connected to the three-way ball valve T15, one end of the fourth ball valve BV2 / 1 is respectively connected to the D valve port of the multi-way valve H19 and one end of the reversing valve 5, the other end of the fourth ball valve BV2 / 1 is respectively connected to one end of the throttling oil circuit 4 and the E port of the motor 7 connected to the winch 6, the other end of the throttling oil circuit 4 is connected to one end of the three-way interface A02, the other end of the three-way interface A02 is connected to the F port of the motor 7, the third end of the three-way interface A02 is connected to one end of the shuttle valve 8, the other end of the shuttle valve 8 is connected to one end of the reversing valve 5, and the other end of the reversing valve 5 is connected to the first brake 2. In this way, when the hydraulic oil drives the motor 7 to rotate, the hydraulic oil flowing through the three-way interface A02 also pushes the shuttle valve 8, and then communicates with the reversing valve 5, causing the reversing valve 5 to reverse, so that the first brake 2 releases the winch 6 brake, thereby realizing the rotation of the winch 6 and driving the load to be lowered. In this embodiment, two reversing valves 5 are provided.

[0030] The throttle oil circuit 4 includes a throttle valve NQ1, an unadjustable throttle valve BR1 and a ball valve five BV2 / 2. The throttle valve NQ1, the unadjustable throttle valve BR1 and the ball valve five BV2 / 2 are connected in series. The unadjustable throttle valve BR1 is connected to one end of the three-way interface A02, and the ball valve five BV2 / 2 is respectively connected to the motor 7E port and the other end of the ball valve four BV2 / 1, so that the amount of hydraulic oil passing through the throttle oil circuit 4 can be adjusted by the throttle valve NQ1, thereby controlling the lowering speed of the load.

[0031] In this embodiment, a one-way valve T18 and a pressure control valve T12 are provided between the T valve port of the multi-way valve H19 and one end of the ball valve three T16. In this way, when the electric emergency state is entered and the emergency solenoid valve T17 is energized, the hydraulic oil flowing through the ball valve three T16 flows to the one-way valve T18, so that the oil pressure of the one-way valve T18 is greater than the oil pressure of the pressure control valve T12, thereby making the hydraulic oil flow from the emergency solenoid valve T17 to the multi-way valve H19 larger.

[0032] The following specific steps are also included:

[0033] When the motor pump group connected to the winch in the loaded state stops working, S1 opens the ball valve 1 H17 connected to the hydraulic oil tank 1, the ball valve 2 connected to the three-way ball valve T15, the ball valve 3 T16 connected to the second brake, the ball valve 4 BV2 / 1 connected to the throttle oil line 4, and the ball valve 5 BV2 / 2 in the throttle oil line, and at the same time closes the ball valve 6 AV1 connected to the winch;

[0034] S2 opens the throttle valve NQ1 in the throttle oil circuit 4, turns the knob of the throttle valve NQ1 to the minimum value, enters the electric emergency state, and proceeds to steps S3 to S4; if the electric emergency state cannot be started, enters the manual emergency state and proceeds to steps S5 to S6;

[0035] S3 puts the three-way ball valve T15 into the electric emergency state, starts the electric emergency release pump H22, and energizes the emergency solenoid valve T17. The hydraulic oil flows through the three-way ball valve T15 through the valve port B, and then flows into the throttle oil circuit 4 and the motor E port. Then, the knob of the throttle valve NQ1 is adjusted to control the flow of the hydraulic oil flowing through the throttle oil circuit 4. The hydraulic oil flowing out of the motor F port merges with the hydraulic oil flowing through the throttle oil circuit 4 and flows into the three-way interface A02, and then flows into the shuttle valve 8. After pushing the shuttle valve 8, it flows into the reversing valve 5 to be reversed to the left cavity of the reversing valve 5, so that the control end of the first brake 2 has hydraulic oil entering. , so that the first brake 2 releases the brake, thereby causing the winch to rotate and drive the load down. After it descends to the ground, the knob of the throttle valve NQ1 is adjusted to control the flow of the hydraulic oil flowing through the throttle oil circuit 4, so that the flow of the hydraulic oil in the throttle oil circuit 4 becomes smaller. In this way, another oil circuit 9 connected to the throttle oil circuit 4 pushes the shuttle valve 8 to move to block the hydraulic oil flowing out of the three-way interface A02. At this time, the first brake 2 squeezes out the hydraulic oil in the first brake 2 under the action of the spring, and the hydraulic oil is diverted to the right cavity through the reversing valve 5 and then flows back to the hydraulic oil tank 1, thereby braking the winch after the load has been lowered;

[0036] S4 When the load on the winch is lowered to the ground, the emergency solenoid valve T17 is closed, so that the emergency solenoid valve group loses power and the electric emergency state ends;

[0037] S5 puts the three-way ball valve T15 into the manual emergency state and manually opens the manual pump H18. The hydraulic oil flows through the three-way ball valve T15 through the manual pump H18 and then flows into the throttle oil circuit 4 and the motor E port. Then, the knob of the throttle valve NQ1 is adjusted to control the flow of the hydraulic oil flowing through the throttle oil circuit 4. The hydraulic oil flowing out of the motor F port merges with the hydraulic oil flowing through the throttle oil circuit 4 and then flows into the three-way interface A02, and then flows into the shuttle valve 8. After pushing the shuttle valve 8, it flows into the reversing valve 5 to be reversed to the left cavity of the reversing valve 5, so that the hydraulic oil enters the control end of the first brake 2, making the first brake Vehicle 2 releases the brake, causing the winch to rotate and drive the loaded object down. After it descends to the ground, the knob of the throttle valve NQ1 is adjusted to control the flow of hydraulic oil flowing through the throttle oil circuit 4, reducing the flow of hydraulic oil in the throttle oil circuit 4. This causes another oil circuit 9 connected to the throttle oil circuit 4 to push the shuttle valve 8 to move and block the hydraulic oil flowing out of the three-way interface A02. At this time, the first brake 2 squeezes out the hydraulic oil in the first brake 2 under the action of the spring, and the hydraulic oil is diverted to the right cavity through the reversing valve 5 and then flows back to the hydraulic oil tank 1, thereby braking the winch after the loaded object has been lowered.

[0038] S6 When the load on the winch is lowered to the ground, the manual pump H18 is manually closed and the manual emergency state ends.

[0039] The working principle of the present invention is as follows: the three-way ball valve T15 is turned to the electric emergency state, so that the emergency solenoid valve is energized, thereby connecting the hydraulic oil in the hydraulic oil tank to the winch through the emergency solenoid valve T17, releasing the brake of the winch, so that the winch drives the winch load to descend, and the descent speed is controlled by the throttle valve NQ1. If the electric emergency state cannot be started, the three-way ball valve T15 is turned to the manual emergency state, and the manual pump is opened manually, so that the hydraulic oil in the hydraulic oil tank is connected to the winch through the manual pump, and then the brake of the winch is released, so that the winch drives the winch load to descend, and the descent speed is controlled by the throttle valve NQ1 at the same time. In this way, in the dual emergency states of electric emergency and manual emergency, it is ensured that the winch can be quickly controlled to lower the load, thereby avoiding accidental misoperation and causing safety hazards to on-site workers.

Claims

1. A method for emergency operation of a crane winch, wherein the hydraulic oil circuit of the crane winch includes a hydraulic oil tank, a ball valve 1, an electric emergency release pump, an emergency solenoid valve, a three-way ball valve, a manual pump, a multi-way valve, a first brake, a second brake, a throttle oil circuit, a reversing valve, and a winch, wherein one end of the ball valve 1 is connected to the hydraulic oil tank, the other end of the ball valve 1 is respectively connected to one end of the electric emergency release pump and one end of the manual pump, the P valve port of the emergency solenoid valve is connected to the electric emergency release pump, the A valve port and the C valve port of the emergency solenoid valve are both connected to the T valve port of the multi-way valve, and the T valve port of the multi-way valve is connected to the One end of ball valve three is connected, the other end of ball valve three is connected to the second brake, the B valve port of the emergency solenoid valve is connected to the three-way ball valve, one end of ball valve four is respectively connected to the D valve port of the multi-way valve and one end of the reversing valve, the other end of ball valve four is respectively connected to one end of the throttling oil circuit and the E port of the motor connected to the winch, the other end of the throttling oil circuit is connected to one end of the three-way interface, the other end of the three-way interface is connected to the F port of the motor, the third end of the three-way interface is connected to one end of the shuttle valve, the other end of the shuttle valve is connected to one end of the reversing valve, and the other end of the reversing valve is connected to the first brake, characterized in that: The emergency operation method includes the following steps: When the motor pump group connected to the winch in the loaded state stops working, S1 opens the ball valve 1 connected to the hydraulic oil tank, the ball valve 2 connected to the three-way ball valve, the ball valve 3 connected to the second brake, the ball valve 4 connected to the throttle oil circuit, and the ball valve 5 in the throttle oil circuit, and at the same time closes the ball valve 6 connected to the winch; S2 opens the throttle valve in the throttle oil circuit and turns the throttle valve knob to the minimum value to enter the electric emergency state, and then proceed to steps S3 to S4. If the electric emergency state cannot be activated, then enter the manual emergency state and proceed to steps S5 to S6. S3 turns the three-way ball valve to the electric emergency state, starts the electric emergency release pump, energizes the emergency solenoid valve, and then adjusts the knob of the throttle valve to control the lowering speed of the load on the winch; S4 When the load on the winch is lowered to the ground, the emergency solenoid valve is closed, so that the emergency solenoid valve group loses power, and the electric emergency state ends and exits; S5 puts the three-way ball valve into the manual emergency state, manually opens the manual pump, and then adjusts the knob of the throttle valve to control the descending speed of the load on the winch; S6 When the load on the winch is lowered to the ground, the manual pump is manually closed and the manual emergency state ends.

2. The crane winch emergency operation method according to claim 1, characterized in that: The manual pump is connected to the three-way ball valve.

3. The crane winch emergency operation method according to claim 1, characterized in that: The throttling oil circuit includes a throttle valve, an unadjustable flow valve and a ball valve five, which are connected in series. The unadjustable flow valve is connected to one end of the three-way interface, and the ball valve five is connected to the motor E port and the other end of the ball valve four respectively.

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