Method for testing variable-amplitude winch for crane

Abstract

The invention provides an ocean crane testing method, which comprises the following steps of: controlling a ball valve I, a ball valve III, and switches of an LWA interface, an LWB interface, an LT interface and an LEP interface which are connected with a multi-way valve group 3, and adjusting a one-way speed regulating valve; whether the control oil circuit can normally drive the variable-amplitude winch to rotate and whether the brake oil circuit can normally brake in the process that the variable-amplitude winch drives the steel wire rope to ascend or descend are tested, so that the variable-amplitude winch can safely and efficiently operate, and safety accidents in the formal operation hoisting process are avoided. According to the invention, the variable-amplitude winch can be ensured to safely realize efficient operation, and safety accidents in the formal hoisting operation process are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to a testing method for a luffing winch for a crane. Background Art

[0002] ‌Nowadays, with the continuous development of the marine economy, the prosperity of the marine economy is increasingly closely linked to the development and application of marine cranes, which has promoted the continuous development and utilization of marine resources, making the demand for marine cranes continue to grow, and they are constantly used in the fields of marine platform construction, marine transportation, offshore operations, etc. For example, on the marine platform, it is used for loading and unloading cargo and lifting personnel to the platform. It is one of the most important production and safety equipment in marine oil production, with the characteristics of large lifting capacity, easy operation, impact resistance, good braking performance, safety and reliability; in the application of offshore engineering projects, the crane is responsible for the lifting and unloading of equipment; in the offshore environment, it is used for tasks such as cargo transportation and transfer between ships, offshore supply, and delivery and recovery of underwater operation equipment.

[0003] Before using the luffing winch for lifting operations, the offshore crane needs to debug. The purpose of debugging is to check whether the performance of the control oil circuit and brake oil circuit connected to the luffing winch is good, and whether the valves in the control oil circuit and brake oil circuit are operating normally, so as to ensure that the luffing winch can operate safely and efficiently and avoid safety accidents during the formal lifting operation. Summary of the invention

[0004] The purpose of the present invention is to provide a testing method for a luffing winch for a crane, so as to ensure that the luffing winch can safely and efficiently operate and avoid safety accidents during the formal hoisting operation.

[0005] In order to achieve the above object, the present invention provides a method for testing a luffing winch for a crane. The luffing winch is set to a no-load state. The external interfaces of the luffing winch are all connected to the multi-way valve group. The external interfaces include LWA interface, LWB interface, LT interface and LEP interface. The multi-way valve group is connected to the oil tank through a variable hydraulic pump. The following steps are also included: S1 Before starting the luffing winch, check the valves in the control oil circuit and brake oil circuit of the luffing winch, and then test the process of the luffing winch driving the wire rope to rise and the process of the luffing winch driving the wire rope to fall. S1.1 The test of the process of the luffing winch driving the wire rope to rise includes S1.1.1~S1.1.4. S1.1.1 Close the LT interface in the multi-way valve group and the ball valves 1 and 2 connected to the LEP interface, open the LWA interface, LWB interface and LEP interface, so that the hydraulic oil enters the three-way interface from the LWA interface, and flows into the motor and shuttle valve respectively after passing through the three-way interface. The hydraulic oil pushes the shuttle valve to move left and flows to the reversing valve for reversing. After the reversing, the hydraulic oil flowing in from the LEP interface flows through the reversing valve and then flows to the luffing winch brake, so that the brake is released; S1.1.2 Open ball valve 3, the hydraulic oil flows through the motor, then through ball valve 3, flows back to the multi-way valve group from the LWB interface, and finally flows back to the oil tank; S1.1.3 Change the flow rate of hydraulic oil entering the LWA interface through the variable hydraulic pump, and then observe whether the rotation speed of the luffing winch changes with the change of the hydraulic oil flow rate; S1.1.4 Close the LEP interface and open the LT interface at the same time, so that the hydraulic oil flows out from the luffing winch brake, flows through the reversing valve to the LT interface, enters the multi-way valve group, and finally flows back to the oil tank. Observe whether the rotation of the luffing winch gradually slows down and stops; S1.2 Test of the process of luffing winch driving the wire rope to descend; S2 disconnects the external interface of the luffing winch and completes the debugging.

[0006] With the above arrangement, when the luffing winch drives the wire rope to rise, after the hydraulic oil enters the three-way interface, it can push the shuttle valve to make the reversing valve realize reversal, so that the hydraulic oil of the LEP interface flows through the reversing valve to release the brake of the luffing winch. At the same time, the hydraulic oil flows through the motor and ball valve three in sequence after passing through the three-way interface, and flows back to the multi-way valve group through the LWB interface to form a completed oil circuit, so that it is possible to observe whether the control oil circuit can normally drive the luffing winch to rotate. After adjusting the one-way speed regulating valve, the shuttle valve can be pushed to block the hydraulic oil flowing into the shuttle valve from the three-way interface, so that the hydraulic oil at the brake of the luffing winch flows back to the LT interface of the multi-way valve group through the reversing valve, so that it is possible to observe whether the rotation of the luffing winch gradually slows down to stop, thereby judging whether the brake oil circuit can achieve braking normally; the test is carried out during the process of the luffing winch driving the wire rope to descend, so as to judge whether the brake oil circuit can achieve braking normally.

[0007] Furthermore, the step S1.2 includes: S1.2.1 to S1.2.3, S1.2.1 Close the LT interface in the multi-way valve group and the ball valves 1 and 2 connected to the LEP interface, open the ball valve 3, LWA interface, LWB interface and LEP interface, so that the hydraulic oil enters the ball valve 3 from the LWB interface, and at the same time, the three-way interface is opened, and the hydraulic oil flows into the three-way interface after passing through the motor, and then flows to the LWA interface and the shuttle valve respectively. The hydraulic oil pushes the shuttle valve to move left and flows to the reversing valve for reversing. After the reversing, the hydraulic oil flowing in from the LEP interface flows through the reversing valve and then flows to the luffing winch brake, so that the brake is released; S1.2.2 Change the flow rate of hydraulic oil entering the LWB interface through the variable hydraulic pump, and then observe whether the reverse rotation speed of the luffing winch changes with the change of the hydraulic oil flow rate; S1.2.3 Close the LEP interface and open the LT interface at the same time, so that the hydraulic oil flows out from the luffing winch brake, flows through the reversing valve to the LT interface, enters the multi-way valve group, and finally flows back to the oil tank. Observe whether the reverse rotation of the luffing winch gradually slows down and stops.

[0008] In the above settings, the hydraulic oil enters from the LWB interface, and the three-way interface is turned on at the same time, so that the hydraulic oil passes through the ball valve 3, the motor, and the three-way interface and then flows back to the LWA interface of the multi-way valve group to form a complete oil circuit. At the same time, the hydraulic oil pushes the shuttle valve after passing through the three-way interface to make the reversing valve realize reversal, so that the hydraulic oil of the LEP interface flows through the reversing valve to release the brake of the luffing winch, driving the luffing winch to rotate in the opposite direction, so that it is possible to observe whether the control oil circuit can normally drive the luffing winch to rotate. After adjusting the one-way speed regulating valve, the shuttle valve can be pushed to block the hydraulic oil flowing into the shuttle valve from the three-way interface, so that the hydraulic oil at the brake of the luffing winch flows back to the LT interface of the multi-way valve group through the reversing valve, so that it is possible to observe whether the rotation of the luffing winch gradually slows down to stop, thereby judging whether the brake oil circuit can achieve braking normally.

[0009] Furthermore, step S1.1.2 also includes the hydraulic oil flowing out from the motor A port flowing to the one-way speed regulating valve and the shuttle valve respectively, and then flowing into the single-piston rod cylinder after passing through the one-way speed regulating valve. The single-piston rod cylinder is provided with a single piston rod and a return spring, the return spring is sleeved on the single piston rod, and the single piston rod is connected to the ratchet of the variable-length winch.

[0010] The above arrangement controls the hydraulic oil entering the single-piston rod cylinder through the one-way speed regulating valve, thereby separating the pawl connected to the single-piston rod cylinder from the ratchet of the luffing winch. When brake failure occurs during the braking process of the luffing winch, the pressure of the single-piston rod cylinder can be changed through the one-way speed regulating valve, thereby driving the pawl connected to the single-piston rod cylinder to achieve emergency braking of the ratchet of the luffing winch.

[0011] Furthermore, step S1.1.4 also includes adjusting the one-way speed regulating valve so that the oil pressure of the hydraulic oil connected to the shuttle valve becomes larger, pushing the shuttle valve to the right, and at the same time, the hydraulic oil flowing out of the variable-length winch brake flows to the shuttle valve after passing through the one-way valve, thereby blocking the connection between the shuttle valve and the three-way interface.

[0012] The above arrangement can prevent the three-way interface from continuing to supply oil to the reversing valve through the shuttle valve during the process of the luffing winch driving the wire rope to rise, thereby making it impossible for the reversing valve to reverse, so that the hydraulic oil of the LEP interface cannot flow to the luffing winch brake through the reversing valve, thereby achieving the luffing winch brake.

[0013] Furthermore, the step S1.2.1 also includes the hydraulic oil flowing back to the multi-way valve assembly through the LWA interface and finally flowing back to the oil tank.

[0014] The above arrangement facilitates the recovery of hydraulic oil, so that a complete oil circuit is formed during the process of the luffing winch driving the wire rope to descend.

[0015] Furthermore, the step S1.2.1 also includes the hydraulic oil flowing out of the ball valve 3 also flowing to the one-way speed regulating valve and the shuttle valve, and then flowing into the single-piston rod cylinder after passing through the one-way speed regulating valve.

[0016] The above arrangement can realize emergency braking of the ratchet wheel of the luffing winch by driving the ratchet connected to the single piston rod cylinder when the brake fails during the process of the luffing winch driving the wire rope to descend.

[0017] Furthermore, step S1.2.3 also includes adjusting the one-way speed regulating valve so that the oil pressure of the hydraulic oil connected to the shuttle valve becomes larger, pushing the shuttle valve to the right, and at the same time, the hydraulic oil flowing out of the variable-length winch brake flows to the shuttle valve after passing through the one-way valve, thereby blocking the connection between the shuttle valve and the three-way interface.

[0018] The above arrangement can prevent the three-way interface from continuing to supply oil to the reversing valve through the shuttle valve during the process of the luffing winch driving the wire rope to descend, thereby making it impossible for the reversing valve to reverse, so that the hydraulic oil of the LEP interface cannot flow to the luffing winch brake through the reversing valve, thereby achieving the luffing winch brake. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the hydraulic oil circuit connection of the luffing winch in the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1As shown, a testing method for a luffing winch for a crane includes an oil tank 1, a variable hydraulic pump 2, a multi-way valve group 3, an LWA interface, an LWB interface, an LT interface and an LEP interface respectively connected to the multi-way valve group 3, a reversing valve HDV, a one-way valve CHV, a three-way interface BO2, a motor BO1 connected to the luffing winch, a ball valve BV2 / 1, a ball valve BV2 / 2, a ball valve BV1, a shuttle valve HSV, a one-way speed regulating valve BO3 and a single piston rod cylinder 4, one end of the ball valve BV2 / 1 is connected to the LEP interface, one end of the ball valve BV1 is connected to the LWB interface and the three-way interface BO2, and the ball valve BV The other end of 2 / 1 is respectively connected to one end of ball valve two BV2 / 2 and the other end of ball valve three BV1. The other end of ball valve two BV2 / 2 is connected to three-way interface BO2 through adjustable flow valve NQ1 and non-adjustable flow valve BR1. The other end of ball valve three BV1 is respectively connected to A port of motor BO1, one end of one-way speed regulating valve BO3 and shuttle valve HSV. B port of motor BO1 is connected to one end of three-way interface BO2. The other end of three-way interface BO2 is connected to LWA interface. The third end of three-way interface BO2 is connected to shuttle valve HSV. Shuttle valve HSV is respectively connected to one end of one-way valve CHV and reversing valve HDV. The other end of one-way valve CHV and reversing valve HDV are both connected to the brake of variable-length winch. Reversing valve HDV is also connected to LT interface. Multi-way valve group 3 is connected to oil tank 1 through variable hydraulic pump 2. The variable-length winch is set to no-load state before testing.

[0022] The following specific steps are also included: S1 Before starting the luffing winch, check the valves in the control oil circuit and brake oil circuit of the luffing winch, and then test the process of the luffing winch driving the wire rope to rise and the process of the luffing winch driving the wire rope to fall. S1.1 The process of the luffing winch driving the wire rope to rise includes S1.1.1~ S1.1.4. S1.1.1 Close the LT interface in the multi-way valve group and the ball valves 1 and 2 connected to the LEP interface, open the LWA interface, LWB interface and LEP interface, so that the hydraulic oil enters the three-way interface from the LWA interface, and then flows into the B port of the motor and the shuttle valve after passing through the three-way interface. The hydraulic oil pushes the shuttle valve to move left and then flows to the reversing valve for reversing. After the reversing, the hydraulic oil flowing in from the LEP interface flows through the reversing valve and then flows to the luffing winch brake, so that the brake is released; S1.1.2 Open ball valve 3, the hydraulic oil flows from port B of the motor to port A of the motor, then flows back to the multi-way valve group from the LWB interface through ball valve 3, and finally flows back to the oil tank. At the same time, the hydraulic oil also flows to the one-way speed regulating valve and shuttle valve, and then flows into the single piston rod cylinder after passing through the one-way speed regulating valve. The single piston rod cylinder is provided with a single piston rod and a return spring, and the return spring is sleeved on the single piston rod. The single piston rod is connected to the ratchet of the luffing winch. In this way, when the brake fails during the test of the luffing winch driving the wire rope to rise, the pressure of the single piston rod cylinder can be changed through the one-way speed regulating valve, thereby driving the ratchet connected to the single piston rod cylinder to realize emergency braking of the ratchet wheel of the luffing winch; S1.1.3 The flow rate of hydraulic oil entering the LWA interface is changed by a variable hydraulic pump, and then the rotation speed of the luffing winch is observed to see whether it changes with the change of the flow rate of hydraulic oil. In this embodiment, if the flow rate of hydraulic oil increases, the rotation speed of the luffing winch also increases, and if the flow rate of hydraulic oil decreases, the rotation speed of the luffing winch also decreases, then it is determined that the control oil circuit of the luffing winch is normal; S1.1.4 Close the LEP interface, open the LT interface at the same time, and adjust the one-way speed regulating valve to increase the pressure of the hydraulic oil connected to the shuttle valve, push the shuttle valve to the right, and at the same time, the hydraulic oil flowing out of the luffing winch brake flows to the shuttle valve after passing through the one-way valve, and then blocks the connection between the shuttle valve and the three-way interface, so that the hydraulic oil flows out of the luffing winch brake, flows to the LT interface through the reversing valve, enters the multi-way valve group, and finally flows back to the oil tank, and observe the rotation of the luffing winch. If the rotation of the luffing winch gradually slows down and stops, it is judged that the brake oil circuit of the luffing winch is normal; S1.2 The process of the luffing winch driving the wire rope to descend includes S1.2.1 to S1.2.3. S1.2.1 Close the LT interface in the multi-way valve group and the ball valve 1 and ball valve 2 connected to the LEP interface, open the ball valve 3, LWA interface, LWB interface and LEP interface, so that the hydraulic oil enters the ball valve 3 from the LWB interface, and at the same time, the three-way interface is turned on, and the hydraulic oil flows into the three-way interface after passing through the motor, and then flows to the LWA interface and the shuttle valve through the three-way interface respectively. The hydraulic oil flows back to the multi-way valve group through the LWA interface, and finally flows back to the oil tank. At the same time, the hydraulic oil pushes the shuttle valve to move left and flows to the reversing valve for reversing. After the reversing, the hydraulic oil flowing in from the LEP interface flows through the reversing valve and then flows to the brake of the luffing winch, so that the brake is released. In this embodiment, the hydraulic oil flowing out of the ball valve 3 also flows to the one-way speed regulating valve and the shuttle valve, and flows into the single-piston rod cylinder after passing through the one-way speed regulating valve, so that when the brake fails during the process of the luffing winch driving the wire rope to descend, the ratchet wheel of the luffing winch can be emergency braked by driving the ratchet connected to the single-piston rod cylinder; S1.2.2 The flow rate of hydraulic oil entering the LWB interface is changed by a variable hydraulic pump, and then the speed of reverse rotation of the luffing winch is observed to see whether it changes with the change of the flow rate of hydraulic oil. In this embodiment, if the flow rate of hydraulic oil increases, the rotation speed of the luffing winch also increases, and if the flow rate of hydraulic oil decreases, the rotation speed of the luffing winch also decreases, then it is determined that the control oil circuit of the luffing winch is normal; S1.2.3 Close the LEP interface and open the LT interface at the same time, so that the hydraulic oil flows out from the luffing winch brake, flows through the reversing valve to the LT interface, enters the multi-way valve group, and finally flows back to the oil tank. Observe the rotation of the luffing winch. If the rotation of the luffing winch gradually slows down and stops, it is judged that the brake oil circuit of the luffing winch is normal; S2 disconnects the external interface of the luffing winch and completes the debugging.

[0023] The working principle of the present invention is as follows: by controlling the switches of ball valve 1, ball valve 3 and LWA interface, LWB interface, LT interface and LEP interface connected to the multi-way valve group 3 and adjusting the one-way speed regulating valve, it is tested whether the control oil circuit of the luffing winch can normally drive the luffing winch to rotate and whether the brake oil circuit can normally brake when the luffing winch drives the wire rope to rise or fall, so as to ensure that the luffing winch can safely and efficiently operate and avoid safety accidents during the formal lifting operation.

Claims

1. A method for testing a marine crane, wherein the luffing winch is set to an unloaded state, the external interfaces of the luffing winch are all connected to a multi-way valve group, the external interfaces include an LWA interface, an LWB interface, an LT interface and a LEP interface, and the multi-way valve group is connected to an oil tank through a variable hydraulic pump, characterized in that: The following steps are also included: S1 Before starting the luffing winch, check the valves in the control oil circuit and brake oil circuit of the luffing winch, and then test the process of the luffing winch driving the wire rope to rise and the process of the luffing winch driving the wire rope to fall. S1.1 The test of the process of the luffing winch driving the wire rope to rise includes S1.1.1~S1.1.

4. S1.1.1 Close the LT interface in the multi-way valve group and the ball valves 1 and 2 connected to the LEP interface, open the LWA interface, LWB interface and LEP interface, so that the hydraulic oil enters the three-way interface from the LWA interface, and flows into the motor and shuttle valve respectively after passing through the three-way interface. The hydraulic oil pushes the shuttle valve to move left and flows to the reversing valve for reversing. After the reversing, the hydraulic oil flowing in from the LEP interface flows through the reversing valve and then flows to the luffing winch brake, so that the brake is released; S1.1.2 Open ball valve 3, the hydraulic oil flows through the motor, then through ball valve 3, flows back to the multi-way valve group from the LWB interface, and finally flows back to the oil tank; S1.1.3 Change the flow rate of hydraulic oil entering the LWA interface through the variable hydraulic pump, and then observe whether the rotation speed of the luffing winch changes with the change of the hydraulic oil flow rate; S1.1.4 Close the LEP interface and open the LT interface at the same time, so that the hydraulic oil flows out from the luffing winch brake, flows through the reversing valve to the LT interface, enters the multi-way valve group, and finally flows back to the oil tank. Observe whether the rotation of the luffing winch gradually slows down and stops; S1.2 Test of the process of luffing winch driving the wire rope to descend; S2 disconnects the external interface of the luffing winch and completes the debugging.

2. A method for testing a marine crane according to claim 1, characterized in that: The step S1.2 includes: including S1.2.1~ S1.2.3, S1.2.1 Close the LT interface in the multi-way valve group and the ball valves 1 and 2 connected to the LEP interface, open the ball valve 3, LWA interface, LWB interface and LEP interface, so that the hydraulic oil enters the ball valve 3 from the LWB interface, and at the same time, the three-way interface is opened, and the hydraulic oil flows into the three-way interface after passing through the motor, and then flows to the LWA interface and the shuttle valve respectively. The hydraulic oil pushes the shuttle valve to move left and flows to the reversing valve for reversing. After the reversing, the hydraulic oil flowing in from the LEP interface flows through the reversing valve and then flows to the luffing winch brake, so that the brake is released; S1.2.2 Change the flow rate of hydraulic oil entering the LWB interface through the variable hydraulic pump, and then observe whether the reverse rotation speed of the luffing winch changes with the change of the hydraulic oil flow rate; S1.2.3 Close the LEP interface and open the LT interface at the same time, so that the hydraulic oil flows out from the luffing winch brake, flows through the reversing valve to the LT interface, enters the multi-way valve group, and finally flows back to the oil tank. Observe whether the reverse rotation of the luffing winch gradually slows down and stops.

3. A method for testing a marine crane according to claim 1, characterized in that: The step S1.1.4 also includes adjusting the one-way speed regulating valve so that the oil pressure of the hydraulic oil connected to the shuttle valve increases, pushing the shuttle valve to the right. At the same time, the hydraulic oil flowing out of the variable-length winch brake flows to the shuttle valve after passing through the one-way valve, thereby blocking the connection between the shuttle valve and the three-way interface.

4. A method for testing a marine crane according to claim 1, characterized in that: The step S1.2.1 also includes the hydraulic oil flowing back to the multi-way valve group through the LWA interface and finally flowing back to the oil tank.

5. A method for testing a marine crane according to claim 1, characterized in that: The step S1.2.1 also includes the hydraulic oil flowing out of the ball valve 3 also flowing to the one-way speed regulating valve and the shuttle valve, and then flowing into the single-piston rod cylinder after passing through the one-way speed regulating valve.

6. A method for testing a marine crane according to claim 1, characterized in that: The step S1.2.3 also includes adjusting the one-way speed regulating valve so that the oil pressure of the hydraulic oil connected to the shuttle valve increases, pushing the shuttle valve to the right. At the same time, the hydraulic oil flowing out of the variable-length winch brake flows to the shuttle valve after passing through the one-way valve, thereby blocking the connection between the shuttle valve and the three-way interface.

Images