Closed loop hoist system

Abstract

This invention discloses a closed-loop hoisting system, including a power unit, a hoisting motor, and system piping. The power unit forms a circuit with a lifting pipe, a lowering pipe, and the hoisting motor. A control pipe is connected to the power unit, and a balance valve is connected to the lifting pipe. The balance valve has a first external control port and a second external control port to control the opening of the valve core. The first external control port is connected to the main control pipe, and the second external control port is connected to the lowering pipe. By replacing the explosion-proof valve with a balance valve, which has two external control ports to control the opening of the valve core, and the two external control ports are respectively connected to specific oil circuits, the system can be switched between normal operation and emergency operation. This ensures the safety and operability of the closed-loop system during normal operation, and also meets the safety and operability requirements of the hoisting system during emergencies.

Description

Technical Field

[0001] This invention relates to a hoist control device, and more particularly to a closed hoist system. Background Technology

[0002] Patent application CN 113148884 A discloses an emergency hydraulic control system for a crane winch, including a pump station and a quick-connect assembly. The pump station has an oil outlet connected to the main oil supply line f. The oil outlet has three pipelines, each connected to a quick-connect assembly. When the engine malfunctions, the system's replenishment oil line has no output, and the closed-loop winch pump has no output, causing the winch brake to fail to open and the winch motor to stop moving. At this time, the first pipeline f1 is connected to the winch brake's control valve via a quick-connect assembly to control the winch brake. The quick-connect assembly of the second pipeline is connected to the winch motor's lowering pipeline fd to replenish oil to the lowering pipeline fd and apply a certain pressure to the lowering outlet to ensure the reliability of the winch system's emergency lowering. The quick-connect assembly of the third pipeline f3 is connected to the winch motor's lifting pipeline fr to depressurize the lifting pipeline fr when the winch motor is lowering. Figure 1 The existing closed-loop winch system includes the following structure: a closed-loop winch pump 1, used to output the winch lifting and lowering power; a winch motor 2, used to convert the winch lifting and lowering power into the winch lifting and lowering action; an explosion-proof valve 3, which locks the winch motor 2 in case of damage to the pipeline between the closed-loop winch pump 1 and the explosion-proof valve 3, preventing the heavy object from falling uncontrollably and causing a safety accident; a brake control valve 4, used to control the opening and closing of the winch brake 10; a system oil circuit 9, which replenishes oil to the winch motor, provides opening pressure to the winch brake 10, and simultaneously opens the explosion-proof valve 3; and a one-way valve 8, which prevents the emergency power from leaking out of the system oil circuit 9 after the emergency pipeline is successfully connected. According to the scheme in CN 113148884 A, in order to protect the winch brake, the maximum output pressure of the emergency system should not exceed the maximum opening pressure of the winch brake (approximately 2 MPa). When the system pressure is low and connected to the existing closed winch system at the maximum pressure, the explosion-proof valve can open (opening pressure approximately 1.5 MPa), performing the original function and ensuring safety. However, it can only realize the emergency lowering function of the winch and cannot control the falling speed. If the system pressure is reduced, the explosion-proof valve cannot open, and the third pipeline f3 can only be connected to the emergency pipeline using the M port of the explosion-proof valve (equivalent to the explosion-proof valve not being connected). At this time, the explosion-proof valve does not function. If the quick connector 11 and its two sides leak due to a fault, the winch system will accelerate the fall and cannot slow down, posing a safety risk. If no load is being lifted at this time, or the load is low, the system will have a large friction force, and the falling speed will be too slow.

[0003] Patent application CN 117003150 A discloses an emergency lowering circuit for a hydraulic winch. The manual pump serves as an emergency system. When an emergency lowering is required, the oil output from the manual pump is used to release the brake on one side and to open the balance valve on the other side, making the two oil ports of the winch motor interconnected. The larger the opening of the balance valve, the faster the load is lowered. The opening of the balance valve is controlled by a manual directional valve. This control system cannot be used in a closed winch system. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a closed hoisting system that is compatible with emergency systems and ensures safety.

[0005] Technical solution: The closed winch system of the present invention includes a power unit, a winch motor, and system piping; the power unit forms a circuit through a lifting pipe, a lowering pipe, and the winch motor, and a main control pipe is connected to the power unit; a balance valve is connected to the lifting pipe, and the balance valve has a control valve core to open a first external control port and a second external control port; the first external control port is connected to the main control pipe, and the second external control port is connected to the lowering pipe.

[0006] Preferably, the balance valve has a first position and a second position. The first position is a bidirectional position and the second position is a unidirectional position. When the balance valve is in the second position, the power unit conducts unidirectionally to the winch motor. When the winch motor is running, the balance valve is switched to the second position by the first external control port or the second external control port.

[0007] Preferably, the fully open pressure of the first external control port is equal to the maximum falling pressure of the winch.

[0008] Preferably, a balanced opening control module is provided on the first pipeline between the first external control and the control pipeline. The balanced opening control module includes a one-way valve, which controls the first pipeline to unidirectionally flow to the first external control port.

[0009] Preferably, the balanced opening control module includes a first filter and / or a ball valve, wherein the first filter and / or ball valve is connected in series with a check valve.

[0010] Preferably, the hoist motor has a brake, the brake's control line is connected to the control line, and a brake control valve is connected to the brake's control line. The opening pressure of the second external control port is not greater than the opening pressure of the brake.

[0011] Preferably, a second filter and a first damper are provided on the second pipeline between the second external control port and the falling oil circuit.

[0012] Preferably, the closed hoisting system further includes an emergency system, which includes an emergency power unit and a control system. The control system includes a third pipeline for connecting to the hoisting pipeline, a fourth pipeline for connecting to the descent pipeline, and a reversing valve. The reversing valve is located between the emergency power unit and the third and fourth pipelines. A shuttle valve is connected between the third and fourth pipelines. The outlet of the shuttle valve is connected to a brake through a fifth pipeline. A second pressure reducing valve is provided on the fifth pipeline.

[0013] Preferably, the fifth pipeline is provided with a second damping.

[0014] Preferably, the outlet ends of the third, fourth, and fifth pipelines are respectively provided with first quick connectors, and the lifting pipeline, lowering pipeline, and brake control oil line are connected to the second quick connectors through a tee pipe.

[0015] Preferably, the quick connector on the brake's control oil circuit is located at the outlet end of the brake control valve.

[0016] Beneficial Effects: Compared with the prior art, the present invention has the following significant advantages: 1. Compatible with emergency systems while ensuring safety: In the present invention, the explosion-proof valve is replaced with a balance valve. The balance valve has two external control ports that control the opening of the valve core. The two external control ports are respectively connected to specific oil circuits to realize the switching between normal operation and emergency system. This ensures both the safety and operability of the closed system during normal operation and meets the safety and operability requirements of the winch during emergencies; 2. Wide speed range: The emergency safety lifting and lowering control of the closed winch system under any load has a large speed range. The operation is simple and reliable. The speed is adjusted through the valve core, and the adjustment accuracy is high; 3. Improved system pressure during emergencies, ensuring the reliability of the no-load winch lowering action. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a closed-loop hoisting system in the prior art.

[0018] Figure 2 for Figure 1 Enlarged view of the middle section structure;

[0019] Figure 3 This is a schematic diagram of the closed-loop hoisting system of the present invention;

[0020] Figure 4 This is a schematic diagram of the closed winch system with an emergency system according to the present invention.

[0021] Figure 5 This is a schematic diagram of the balanced opening control module of the closed hoisting system of the present invention.

[0022] Figure 6 This is a schematic diagram of the emergency system of the present invention. Detailed Implementation

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0024] like Figure 3 As shown, the closed-loop hoisting system of the present invention mainly consists of a power unit 1, a hoisting motor, and system piping 9. The power unit 1 forms a circuit with the hoisting pipe 9.2, the lowering pipe 9.3, and the hoisting motor. The power unit 1 is also connected to a main control pipe 9.1, which is used to control the opening of the switching valve or other valve bodies. Specifically, a balance valve 15 is connected to the hoisting pipe 9.2. The balance valve 15 has a first external control port X1 and a second external control port X for controlling the valve core to open. The first external control port X1 is connected to the main control pipe 9.1, and the second external control port X is connected to the lowering pipe 9.3.

[0025] The valve core of the balance valve 15 opens, allowing the lifting pipeline 9.2 to be open. The opening degree of the balance valve 15 is controlled by the pressure ratio of the first external control port X1 and the second external control port X2. Specifically, the balance valve 15 has a first position and a second position. The first position is a bidirectional position (lower position in the figure), and the second position is a unidirectional position or a disconnected position. When there is no action, the balance valve 15 is in the second position. When the hoist motor is running, the main control pipeline 9.1 flows through the first external control port X1 (in emergency situations, the lowering pipeline 9.3 flows through the second external control port X2). When the balance valve 15 is switched to the first position (X1 drives the balance valve 15 to the first position proportionally), the winch motor can perform lifting and lowering (emergency lowering) functions. If there is an abnormality in the winch lifting / lowering port pipeline, a malfunction in power unit 1, or a burst in the lifting pipeline 9.2 between power unit 1 and the winch motor, causing a pressure drop / abnormality in the main control pipeline 9.1, and the first external control port X1 fails due to lack of pressure, the balance valve 15 returns to the second position, and the lifting pipeline 9.2 is either unidirectionally open or closed to prevent the winch motor from stalling and ensure safety. The fully open pressure of the first external control port X1 is equal to the maximum lifting pressure. At the maximum lifting pressure, the first external control port X1 controls the balance valve 15 to be fully open. At other lifting pressures, partial throttling occurs. The second position is preferably a unidirectional open position, allowing the lifting pipeline 9.2 to flow unidirectionally from power unit 1 to the winch motor.

[0026] like Figure 3 , Figure 5As shown, the pipeline between the first external control port X1 and the main control pipeline 9.1 is the first pipeline 9.11. The first pipeline 9.11 is used to control the valve core of the balance valve 15 to switch to the first position. The first pipeline 9.11 is equipped with a balance opening control module 17, which is mainly composed of a one-way valve 17.2. The one-way valve 17.2 controls the first pipeline 9.11 to conduct one-way traffic to the first external control port X1. The function of the one-way valve 17.2 is to protect the emergency power from being lost through the main control pipeline 9.1 in an emergency, ensuring the speed regulation of the closed hoisting system in an emergency. At the same time, it prevents the pressure of the falling oil circuit 9.3 from entering the first external control port X1 through the second external control port X controlled by the balance valve 15, which would cause the balance valve 15 to be fully open and the pressure to increase. Based on this, the balance opening control module 17 may also include a filter 17.1 and / or a ball valve 17.3 connected in series with the check valve 17.2. The filter 17.1 is used to filter the pilot oil to ensure the cleanliness of the oil and prevent the balance valve from sticking. The ball valve 17.3 is used to close the first external control port X1 oil circuit in an emergency to prevent the safety risk caused by the sudden pressure generated in the oil circuit due to unknown reasons, which would lead to the opening of the balance valve 15.

[0027] The closed-type winch motor has a brake 10. When the winch motor stops working, the brake 10 brakes the winch motor. The control terminal of the brake 10 is connected to the main control pipeline 9.1. When the winch motor runs, the brake 10 is released by the main control pipeline 9.1. A brake control valve 4 is connected on the pipeline between the brake 10 and the main control pipeline 9.1. The brake control valve 4 controls the main control pipeline 9.1 to supply oil to the brake 10 or the brake 10 to return oil to the oil tank. The opening pressure of the second external control port X is not greater than the opening pressure of the brake 10.

[0028] A second pipe 9.31 is provided between the descent pipe 9.3 and the balance valve 15. The second pipe 9.31 is connected to the second external control port X of the balance valve 15. When the emergency system is activated, the second pipe 9.31 is used to control the valve core of the balance valve 15 to switch to the first position. The second pipe 9.31 is equipped with a filter and damper. During the descent of the winch, the pressure fluctuation at the descent port of the winch motor will cause the pressure at the second external control port X of the winch balance valve 15 to fluctuate, which in turn causes the balance valve 15 to open fluctuate. In actual operation, this is reflected as the winch shaking during descent. The damper is used to avoid this problem.

[0029] like Figure 2In existing technology, when a closed-loop hoisting system requires emergency response, the start and stop of emergency lowering are achieved by opening or closing valve 13.1, and the emergency lowering speed is adjusted by regulating speed control valve 13.2. The presence of check valve 13.3 ensures that the pressure of the emergency oil source does not enter the hoisting motor inlet. In the existing solution, the start and stop of emergency lowering and speed regulation of the hoisting system need to be controlled separately by ball valve and speed control valve, which presents operational inconvenience. The speed control valve is an adjustable damper with low adjustment accuracy.

[0030] When a closed-loop hoisting system malfunctions, the emergency system needs to be activated to ensure safety, such as... Figure 6 , Figure 4 As shown, the emergency system includes an emergency power unit 14 and a control system 16. The emergency power unit 14 is used to provide the necessary power output to the closed hoisting system in an emergency. The output flow rate only needs to meet the emergency lifting and lowering speed, and the output pressure is determined according to actual needs. The control system 16 is used to control the emergency power unit 14 to supply oil to the hoisting pipe 9.2 or the lowering pipe 9.3 and the brake 10. Specifically, the control system 16 includes a third pipe 16.5, a fourth pipe 16.6, and a reversing valve 16.5. The third pipe 16.5 is used to connect to the hoisting pipe 9.2, and the fourth pipe 16.6 is used to connect to the lowering pipe 9.3. The reversing valve 16.5 is located between the emergency power unit 14 and the third pipe 16.5 and the fourth pipe 16.6. When the emergency system is connected, the reversing valve 16.5 is used to switch the hoist's raising, lowering, and stopping, and to adjust the raising and lowering speed. A shuttle valve 16.1 is connected between the third pipe 16.5 and the fourth pipe 16.6. The outlet of the shuttle valve 16.1 is connected to the brake 10 through the fifth pipe 16.8. The fifth pipe 16.8 is equipped with a pressure reducing valve 16.3 and a damping valve 16.4. Damping 16.4 is used to filter the pressure after pressure reduction by pressure reducing valve 16.3, preventing excessive pressure fluctuations from affecting the opening of brake 10. A one-way valve 16.2 is connected in parallel on the fifth pipeline at both ends of pressure reducing valve 16.3 and damping 16.4. The one-way valve 16.2 is used for oil return after brake 10 is closed.

[0031] When the closed hoisting system malfunctions, the opening degree of the control reversing valve 16.3 is adjusted, the emergency power unit 14 supplies oil to the brake 10 and the lower pipeline 9.3, the lifting pipeline 9.2 returns oil to the oil tank, the brake 10 is opened, and the hoisting system can realize the lowering function.

[0032] Quick connectors 11, 12, and 7 are respectively installed at the outlets of the third pipeline 16.5, the fourth pipeline 16.6, and the fifth pipeline 16.8. The lifting pipeline 9.2, the lowering pipeline 9.3, and the brake control hydraulic line are connected to the quick connectors via a tee pipe. This allows the emergency hydraulic line to be directly connected to the closed-loop hoisting system. When needed, the directional valve 16.5 can be controlled; otherwise, it needs to be reconnected. The quick connector on the brake 10 control hydraulic line is located at the outlet of the brake control valve 4 to simplify emergency system operation. The form and principle of the power unit in this invention are not limited, as long as it can output the required pressure and flow rate.

Claims

1. A closed-loop hoisting system, comprising a power unit (1), a hoisting motor, and system piping (9); the power unit (1) forms a circuit through a lifting pipe (9.2), a lowering pipe (9.3), and the hoisting motor; the power unit (1) is connected to a main control pipe (9.1), characterized in that, A balance valve (15) is connected to the lifting pipeline (9.2). The balance valve (15) has a first external control port (X1) and a second external control port (X) to control the opening of the valve core. The first external control port (X1) is connected to the main control pipeline (9.1), and the second external control port (X) is connected to the lowering pipeline (9.3). The balance valve (15) has a first position and a second position. The first position is a bidirectional position, and the second position is a unidirectional position. When the balance valve (15) is in the second position, the power unit (1) conducts unidirectional power to the hoisting motor. When the hoisting motor is running, the balance valve (15) is switched to the second position by either the first external control port (X1) or the second external control port (X). The closed hoisting system also includes an emergency system, which includes an emergency... The power unit (14) and the control system (16) include a third pipeline (16.5) for connecting the lifting pipeline (9.2), a fourth pipeline (16.6) for connecting the lowering pipeline (9.3), and a reversing valve. The reversing valve is located between the emergency power unit (14) and the third pipeline (16.5) and the fourth pipeline (16.6). A shuttle valve (16.1) is connected between the third pipeline (16.5) and the fourth pipeline (16.6). The outlet of the shuttle valve (16.1) is connected to the brake (10) through a fifth pipeline (16.8). A second pressure reducing valve (16.3) and a second damping valve (16.4) are provided on the fifth pipeline (16.8).

2. The closed-loop hoisting system according to claim 1, characterized in that, The fully open pressure of the first external control port (X1) is equal to the maximum pressure of the winch falling.

3. The closed-loop hoisting system according to claim 1, characterized in that, The hoisting motor has a brake (10), the control line of the brake (10) is connected to the main control line (9.1), and a brake control valve (4) is connected to the control line of the brake (10). The opening pressure of the second external control port (X) is not greater than the opening pressure of the brake (10).

4. The closed-loop hoisting system according to claim 1, characterized in that, A balance opening control module (17) is provided on the first pipeline (9.11) between the first external control port (X1) and the main control pipeline (9.1). The balance opening control module (17) includes a one-way valve (17.2), which controls the first pipeline (9.11) to unidirectionally flow to the first external control port (X1).

5. The closed-loop hoisting system according to claim 4, characterized in that, The balanced opening control module (17) includes a first filter (17.1) and / or a ball valve (17.3), which are connected in series with a check valve (17.2).

6. The closed-loop hoisting system according to claim 1, characterized in that, A second filter and a first damper are provided on the second pipeline (9.31) between the second external control port (X) and the drop pipeline (9.3).

7. The closed-loop hoisting system according to claim 1, characterized in that, The outlet ends of the third pipeline (16.5), the fourth pipeline (16.6), and the fifth pipeline (16.8) are respectively equipped with first quick connectors, and the control oil lines of the lifting pipeline (9.2), the lowering pipeline (9.3), and the brake (10) are connected to the second quick connectors through tee pipes.

8. The closed-loop hoisting system according to claim 7, characterized in that, The quick connector on the control oil circuit of the brake (10) is located at the outlet end of the brake control valve (4).

Images