A hydraulic integrated emergency valve group for emergency release of a crane

Abstract

The present invention discloses an emergency valve group integrated by an emergency release principle for crane emergency release, including a threaded cartridge shuttle valve, a threaded cartridge check valve, a threaded cartridge throttle valve, an embedded threaded damping plug, and a threaded cartridge balance cone valve. There are a total of 6 oil ports on the valve group. The oil port P is the emergency oil inlet, which is docked with the outlet of the manual pump; the oil port L is the oil drain port of the valve group, which is connected to the fuel tank; the oil port C is the brake pressure oil supply port, which is connected to the brake; the oil port BR is the brake pressure oil control port, which is connected to the crane hoisting control module; the oil ports A1 and B1 are the oil supply ports for the crane hoisting winch motor, which are connected to the branches of the motor supply oil circuit. The beneficial effects of the present invention are as follows: The valve group integrates the emergency release control function of the crane hoisting winch, ensuring the stability and safety of the crane during emergency release; the present invention provides an effective solution for realizing the safe emergency release of the hydraulic crane hoisting winch.

Description

Technical Field

[0001] The present invention relates to a hydraulic integrated emergency valve group, specifically a hydraulic integrated emergency valve group for emergency release of a crane hoisting winch, belonging to the technical field of construction machinery. Background Art

[0002] During the lifting process of a hydraulic crane, in case of sudden power failure or other emergencies, the power source will be lost, causing the heavy object to be in a suspended state, and the heavy object needs to be lowered emergently. Hydraulic cranes are generally used for lifting heavy loads with large tonnages, and emergency release has certain risks and instabilities. In severe cases, it will cause the heavy object to directly free-fall to the ground and the motor to be damaged due to stall. The present invention provides a hydraulic integrated emergency valve group for emergency release of a crane hoisting winch, which can solve the above technical defects and very effectively release the suspended heavy object of the hydraulic crane slowly, thus ensuring the safety and stability of the emergency release of the heavy object by the hydraulic crane in an emergency state. Summary of the Invention

[0003] The present invention provides a hydraulic integrated emergency valve group for emergency release of a winch to ensure the safe realization of the emergency release function.

[0004] The solution of the present invention to the above technical problems is as follows: It includes a valve block, a screw-in cartridge shuttle valve, a screw-in cartridge check valve, a screw-in cartridge throttle valve, a damping plug, and a screw-in cartridge balance cone valve. There are 3 oil circuits inside the valve block, and the connection relationship between the oil circuits and each valve component is specifically as follows:

[0005] The three oil circuits inside the valve block are respectively an oil replenishing circuit for replenishing oil to the winch motor, a control circuit for controlling the balance cone valve, and a control circuit for controlling the brake.

[0006] The hydraulic oil in these three oil circuits is provided by a manual pump. Therefore, there is an emergency oil port P of the manual pump on the valve block. Connecting the manual pump interface to it can supply oil to the three oil circuits. Since the application of the emergency valve group cannot affect the operation of the hoisting winch in the non-emergency state, the control oil for normal braking needs to be combined with the control oil provided by the manual pump for braking through a shuttle valve mechanism to control the brake by an "OR" logical relationship. The oil port BR on the valve block is used to introduce the brake control oil in the normal working state of the winch, and the oil port C leads out the brake control oil passing through the shuttle valve to the braking mechanism of the hoisting winch to control the brake. The emergency oil provided by the manual pump is also supplied to the pilot control port of the balance cone valve to control the movement of the spool of the balance cone valve. The balance cone valve requires a drain cavity, so the L port on the valve block is for draining oil. The inlet and outlet oil ports of the balance cone valve are respectively connected to the working oil ports of the motor, and a throttle valve is connected in series on the back pressure side. The A1 and B1 ports on the valve block are connected to the working oil ports of the motor. The emergency oil of the manual pump simultaneously fills the two sides of the motor. The oil filling on the back pressure side is in series with a check valve, and the oil filling to the low-pressure side needs to pass through a damper and a check valve.

[0007] The brake control oil circuit adopts a shuttle valve, enabling the brake control oil to switch the oil supply in two modes and allowing the brake control oil to be drained through the emergency valve group or the winch control oil circuit.

[0008] The control loop of the motor working oil circuit adopts a self-draining balance cone valve. When the spool is opened, the oil circuits at both ends of the motor are connected and in a free-wheel state, allowing the hoisting winch to lower by its own weight. The purpose of the throttle valve is to adjust the lowering speed. However, in the emergency state, the winch cannot keep lowering continuously. To ensure the safety of emergency release, the heavy object must be lowered as the emergency manual pump is shaken, lowering and stopping as the pump is operated and stopped. Therefore, the control oil pressure at the pilot oil port of the balance cone valve needs to be drained in a timely manner during the lowering process. To ensure the timeliness of pressure relief and the safety of emergency release, the present invention adopts a self-draining balance cone valve.

[0009] The motor oil filling circuit uses check valves to fill the two sides of the motor to prevent cavitation due to the lack of back pressure on both sides of the motor. However, a damper needs to be connected in series on the low-pressure side to build up sufficient pressure in the emergency oil circuit to open the brake and the balance cone valve.

[0010] The beneficial effects of the present invention are as follows: A hydraulic integrated emergency valve group for the emergency release of a winch provided by the present invention is a functional supplement to the winch control module and is to meet the need for realizing the emergency release function of the hoisting winch. Compared with the method of directly pumping oil to the system circuit through a manual pump, this emergency valve group is more labor-saving. Especially for winches with large flow requirements, the method of directly pumping oil to the system to drive the motor seems very powerless. At this time, relying on its own weight to achieve lowering, the main function of the manual pump changes from a driving source to a control source, and the requirements for the manual pump itself will be greatly reduced. The present invention very effectively slowly and emergently releases the heavy object suspended by the hydraulic crane, thus ensuring the safety and stability of the emergency release of the heavy object by the hydraulic crane in an emergency state. In addition, as a supplementary module, this emergency valve group does not affect the design of the winch control principle at all and is flexibly arranged. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0012] Figure 1 Schematic diagram of the principle of the present invention;

[0013] Figure 2 Schematic structural diagram of the present invention;

[0014] Figure 3 Schematic structural diagram of the present invention;

[0015] Figure 4 Schematic diagram of the implementation principle of the present invention;

[0016] Figure 5 Schematic layout diagram of the present invention.

[0017] In the figure: 1, threaded cartridge shuttle valve; 2, threaded cartridge check valve; 3, threaded cartridge throttle valve; 4, damping plug; 5, threaded cartridge balance cone valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present invention provides a hydraulic integrated emergency valve group for the emergency release of a winch, as shown in Figure 1 , 2 , 3, which includes a valve block, a threaded cartridge shuttle valve 1, a threaded cartridge check valve 2, a threaded cartridge throttle valve 3, a damping plug 4, and a threaded cartridge balance cone valve 5.

[0019] There is a manual pump emergency oil port P on the valve block. Connecting the manual pump interface to it can supply oil to three oil circuits. The oil port BR on the valve block is used to introduce the brake control oil in the normal working state of the winch, and the oil port C is used to lead out the brake control oil passing through the shuttle valve to the braking mechanism of the winch to control the brake. The balance cone valve requires an oil drain cavity, so the L port on the valve block is for oil drainage. The A1 and B1 ports on the valve block are connected to the working oil ports of the motor. The recommended displacement of the manual pump is 25 - 35 ml / time. The damping plug 4 set in the valve block not only plays a role in pressure drop but also retains the function of oil drainage and flow when the manual pump stops. Therefore, the selection of its flow area should be appropriate, and the recommended damping diameter is between 0.8 - 1 mm.

[0020] The interface layout is completed as Figure 5 shown. After pre-adjusting the throttle valve, checking the system and the site and confirming, shake the manual pump to supply oil to the P port. The phenomenon that can be seen is that the hoisting winch lowers the heavy object by a certain distance and then stops immediately. When shaking the manual pump again, this phenomenon will repeat until the heavy object lands safely.

[0021] In addition to the above embodiments, the present invention has other embodiments. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope required by the present invention.

[0022] A hydraulic integrated control valve group for emergency release of a crane, including a valve block, a threaded cartridge shuttle valve 1, a threaded cartridge check valve 2, a threaded cartridge throttle valve 3, an embedded threaded damping plug 4, and a threaded cartridge balance cone valve 5. There are 3 oil circuits inside the valve block, and the connection relationship between the oil circuits and each valve component is as follows:

[0023] The three oil circuits inside the valve block are respectively a make-up oil circuit for supplying oil to the hoisting winch motor of the crane, a control oil circuit for controlling the balance cone valve, and a control oil circuit for controlling the brake;

[0024] The oil in these three oil circuits is provided by the manual pump. Therefore, there is a manual pump emergency oil port P on the valve block. Connecting the manual pump interface to it can supply oil to the three oil circuits. Since the application of the emergency valve group cannot affect the operation of the winch in the non-emergency state, the control oil used to normally control the brake needs to control the brake through the shuttle valve mechanism with an "OR" logical relationship with the control oil provided by the manual pump for the brake. The oil port BR on the valve block is used to introduce the brake control oil in the normal working state of the winch, and the oil port C is used to lead out the brake control oil passing through the shuttle valve to the braking mechanism of the winch to control the brake;

[0025] The emergency oil provided by the manual pump is simultaneously supplied to the pilot control port of the balance cone valve to control the spool movement of the balance cone valve. The balance cone valve requires a drain cavity, so the L port on the valve block is for draining oil. The oil inlet and outlet ports of the balance cone valve are respectively connected to the working oil ports of the motor. Meanwhile, a throttle valve is connected in series on the backpressure side. The A1 and B1 ports on the valve block are docked with the working oil ports of the motor.

[0026] The emergency oil of the manual pump simultaneously fills the oil on both sides of the motor. The oil filling on the backpressure side is in series with a check valve, and the oil filling to the low-pressure side needs to pass through a damper and a check valve.

[0027] The emergency valve group for the emergency release of the winch includes three hydraulic oil circuits to respectively complete the functions of oil filling, controlling the oil circuit of the motor, and controlling the opening and closing of the braking mechanism.

[0028] The valve group uses a threaded cartridge shuttle valve 1 to control the braking control oil circuit.

[0029] The valve group uses an internally self-draining threaded cartridge balance cone valve 5 and a threaded cartridge throttle valve 3 to control the working oil circuit of the motor.

[0030] The valve group uses a threaded cartridge check valve 2 and a damper plug 4 to achieve oil filling.

Claims

1. A hydraulic integrated control valve group for emergency release of a crane, characterized in that: It includes a valve block, a screw-in cartridge shuttle valve, a screw-in cartridge check valve, a screw-in cartridge throttle valve, an embedded screw damping plug, and a screw-in cartridge balance cone valve. There are 3 oil circuits inside the valve block, and the connection relationships between the oil circuits and each valve component are as follows: The three oil circuits inside the valve block are respectively an oil replenishing circuit for replenishing oil to the hoist winch motor of the crane, a control circuit for controlling the balance cone valve, and a control circuit for controlling the brake. The oil in the three oil circuits is provided by a manual pump. There is an emergency oil port P of the manual pump on the valve block. Connect the manual pump interface to the emergency oil port P of the manual pump to supply oil to the three oil circuits. The screw-in cartridge shuttle valve is connected in series in the brake control circuit for controlling the brake control circuit. The internally self-draining screw-in cartridge balance cone valve and the screw-in cartridge throttle valve are installed in the motor working circuit for controlling the motor working circuit. A damping plug is arranged inside the valve block. The damping plug not only plays a role in pressure drop but also retains the function of draining oil when the manual pump stops. Therefore, its flow area should be appropriately selected, and the recommended damping diameter is between 0.8 and 1 mm. The screw-in cartridge check valve and the damping plug are connected in series in the control circuit of the balance cone valve. The motor oil replenishing circuit uses a check valve to replenish oil to both sides of the motor to prevent cavitation due to the lack of back pressure on both sides of the motor. However, a damping needs to be connected in series on the low-pressure side to build enough pressure in the emergency oil circuit to open the brake and the balance cone valve. The control oil for normal brake control needs to control the brake through the shuttle valve mechanism with an "OR" logical relationship with the control oil provided by the manual pump for the brake. The oil port BR on the valve block is used to introduce the brake control oil in the normal working state of the winch, and the oil port C is used to lead out the brake control oil passing through the shuttle valve to the braking mechanism of the winch to control the brake. The emergency oil provided by the manual pump is also provided to the pilot control port of the balance cone valve to control the movement of the spool of the balance cone valve. The balance cone valve requires a drain cavity. Therefore, the L port on the valve block is for draining oil. The inlet and outlet oil ports of the balance cone valve are respectively connected to the working oil ports of the motor. At the same time, a throttle valve is connected in series on the back pressure side. The A1 and B1 ports on the valve block are docked with the working oil ports of the motor. The emergency oil of the manual pump replenishes oil to both sides of the motor at the same time. A check valve is connected in series for oil replenishment on the back pressure side, and oil replenishment to the low-pressure side needs to pass through a damping and a check valve. The emergency valve group for emergency release of the winch includes three hydraulic oil circuits that respectively complete the functions of oil replenishment, controlling the motor oil circuit, and controlling the opening and closing of the braking mechanism.

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