Quick emergency control system for hydraulic crane

Abstract

The utility model provides a quick emergency control system for a hydraulic crane. The quick emergency control system comprises a manual pump, an oil cylinder, a lifting motor and a hydraulic rotary motor, the lifting motor is connected with the main valve through a winch control valve group; the winch control valve group comprises a first shuttle valve, a balance valve, a second hydraulic reversing valve, a one-way pressure reducing valve, a third hydraulic reversing valve, a second speed regulating valve, a second hydraulic control one-way valve, a second oil supplementing valve and a second shuttle valve; wherein the port A is connected with the port A1 through the second hydraulic reversing valve, the port B is connected with the port B1 through the balance valve, the first shuttle valve is arranged between the A-A1 oil way and the B-B1 oil way in parallel, and the middle position of the first shuttle valve is sequentially connected with the second shuttle valve, the second hydraulic reversing valve and the one-way pressure reducing valve; and an FL port is sequentially connected with a second oil supplementing valve, a second speed regulating valve and a third hydraulic reversing valve. According to the system, the high-efficiency control valve group is integrated and comprises a plurality of hydraulic reversing valves and speed regulating valves, so that the system can respond quickly, and the quick action of the lifting and rotary motor is realized.

Description

Technical Field

[0001] This article relates to a control system for the rapid emergency of a hydraulic crane. Background Art

[0002] In the existing technology, as Figures 6-7 shown, the driving part in the adopted hydraulic principle is often relatively simple. Basically, a manual pump is used as the power source to directly replace the oil pump motor group to drive the hydraulic actuator. During the emergency lowering process of the crane's boom, the pressure oil from the manual pump flows through the cylinder working piece of the main valve to the left free passage of the cylinder valve group and enters the rod chamber of the luffing cylinder. At the same time, the hydraulic oil in the rodless chamber of the luffing cylinder flows through the spool of the balance valve to the cylinder working piece of the main valve, and finally returns to the fuel tank through the return oil filter, causing the cylinder to retract and the boom to lower.

[0003] The existing emergency release system of hydraulic cranes has certain limitations. Due to a certain degree of leakage in the hoisting hydraulic motor during operation, and the small flow rate of the manual pump when providing pressure oil, this results in a slow speed of releasing the hoisting winch in an emergency. When a large height needs to be lowered, not only does it take a long time and have low efficiency, but also the operator needs to put in more labor and time. Summary of the Invention

[0004] To solve the above problems, this article proposes a rapid emergency lowering control system for a hydraulic crane with fast response and stronger ability to handle emergency scenarios.

[0005] A control system for the rapid emergency of a hydraulic crane includes a manual pump, a cylinder, a hoisting motor, and a hydraulic slewing motor; the hoisting motor is connected to the main valve through a winch control valve group; the winch control valve group includes a first shuttle valve, a balance valve, a second hydraulic directional control valve, a one-way pressure reducing valve, a third hydraulic directional control valve, a second speed control valve, a second hydraulic check valve, a second oil replenishing valve, and a second shuttle valve;

[0006] where the A port is connected to the A1 port through the second hydraulic directional control valve, and the B port is connected to the B1 port through the balance valve,

[0007] A first shuttle valve is arranged in parallel between the A - A1 oil circuit and the B - B1 oil circuit, and the middle position of the first shuttle valve is successively connected to the second shuttle valve, the second hydraulic directional control valve, and the one-way pressure reducing valve;

[0008] The FL port is successively connected to the second oil replenishing valve, the second speed control valve, and the third hydraulic directional control valve.

[0009] Further, the cylinder is a luffing cylinder.

[0010] Further, an oil cylinder working piece, a winch working piece and a slewing working piece are arranged in the main valve. Among them, the oil cylinder working piece is connected to the oil cylinder through an oil cylinder valve group, and the winch working piece is connected to the hoisting motor through a winch control valve group.

[0011] Further, the boom is driven by a luffing oil cylinder.

[0012] To maintain the control safety of the main valve, a relief valve is arranged in the main valve, and the relief valve is connected in parallel with the oil cylinder working piece, the winch working piece and the slewing working piece.

[0013] To improve the cleanliness of the system, the main valve is connected to the fuel tank through an oil return filter.

[0014] Further, there is a manual ball valve on the fuel tank, and the working oil ports of the manual ball valve are directly connected to the first manual valve, the second manual valve, the manual pump and the main valve respectively.

[0015] Beneficial effects:

[0016] In this system, by integrating high-performance control valve groups, including multiple hydraulic directional control valves and flow control valves, the system can respond quickly and achieve rapid actions of the hoisting and slewing motors.

[0017] The configuration of multiple hydraulic directional control valves provides precise oil flow guidance and regulation capabilities, allowing for more refined control of the crane's operation. The setting of a relief valve in the main valve enhances the safety performance of the system and can effectively avoid the risks of overload and excessive pressure. The rapid switching involving the hoisting motor and the hydraulic slewing motor enables the crane to quickly lower or slew in case of an emergency, thus reducing potential hazards and risks.

[0018] Through the combination of an oil cylinder, a winch control valve group and other components, simultaneous or sequential control of multiple actuator actions can be achieved. The multi-valve configuration of the system provides redundancy for certain critical operations, enhancing the reliability and fault tolerance of the system. The clear oil circuit setting and modular design allow for easy inspection and maintenance, reducing maintenance costs and downtime. The high degree of integration of the entire control system may improve the overall performance and operating efficiency of the hydraulic crane. Description of the drawings

[0019] Figure 1 is the overall control diagram of a control system for rapid emergency of a hydraulic crane;

[0020] Figure 2 is the partial enlarged view of the winch control valve group and the hydraulic motor part;

[0021] Figure 3 is the partial enlarged view of the slewing part;

[0022] Figure 4It is a partial enlarged view of the main valve part;

[0023] Figure 5 It is a partial enlarged view of the balance valve and the boom cylinder part;

[0024] Figure 6 It is a schematic diagram of an oil cylinder valve group without functions such as commutation and speed regulation in the prior art;

[0025] Figure 7 It is a schematic diagram of a winch control valve group without functions such as commutation in the prior art;

[0026] Wherein:

[0027] 1. Manual pump;

[0028] 2. Main valve;

[0029] 3. Oil cylinder valve group;

[0030] 4. Boom cylinder;

[0031] 5. Winch control valve group;

[0032] 6. Hoisting motor;

[0033] 7. Return oil filter;

[0034] 8. Hydraulic slewing motor;

[0035] 9. Slewing motor valve group;

[0036] 10. Manual ball valve;

[0037] 11. First manual reversing valve;

[0038] 12. Second manual reversing valve;

[0039] 2-1. Relief valve;

[0040] 2-2. Oil cylinder working piece;

[0041] 2-3. Winch working piece;

[0042] 2-4. Slewing working piece;

[0043] 3-1. Oil cylinder valve group spool;

[0044] 3-2. First hydraulic reversing valve;

[0045] 3-3. First speed control valve;

[0046] 3-4. First oil replenishing valve;

[0047] 3-5. Back pressure valve;

[0048] 3-6. First hydraulic control check valve;

[0049] 5-1, First shuttle valve;

[0050] 5-2, Balance valve;

[0051] 5-3, Second hydraulic directional control valve;

[0052] 5-4, One-way pressure reducing valve;

[0053] 5-5, Third hydraulic directional control valve;

[0054] 5-6, Second speed control valve;

[0055] 5-7, Second hydraulic check valve;

[0056] 5-8, Second oil replenishing valve;

[0057] 5-9, Second shuttle valve. Specific embodiments

[0058] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0059] Embodiment 1:

[0060] As Figures 1-5 shown, a control system for rapid emergency of a hydraulic crane. It includes a manual pump 1, a main valve 2, an oil cylinder valve group 3, a luffing oil cylinder 4, a winch control valve group 5, a hoisting motor 6, an oil return filter 7, a hydraulic slewing motor 8, a slewing motor valve group 9, a manual ball valve 10, a first manual directional control valve 11, and a second manual directional control valve 12. The specific connection and setting structure is as Figure 1 shown.

[0061] Among them, the oil cylinder valve group 3 includes an oil cylinder valve group spool 3-1, a first hydraulic directional control valve 3-2, a first speed control valve 3-3, a first oil replenishing valve 3-4, a back pressure valve 3-5, and a first hydraulic check valve 3-6;

[0062] The winch control valve group 5 includes a first shuttle valve 5-1, a balance valve 5-2, a second hydraulic directional control valve 5-3, a one-way pressure reducing valve 5-4, a third hydraulic directional control valve 5-5, a second speed control valve 5-6, a second hydraulic check valve 5-7, a second oil replenishing valve 5-8, and a second shuttle valve 5-9;

[0063] The system is provided with a manual ball valve 10, which can make the system function exactly the same as before improvement in the initial state, retaining the high-pressure oil that can be discharged through the manual pump 1. After passing through the slewing working piece 2-4 of the main valve 2 and flowing through the slewing motor valve group 9, it directly drives the hydraulic slewing motor 8 to achieve the manual emergency slewing function.

[0064] When it is necessary to emergently release the boom, turn the handle of the manual ball valve 10 so that the pressure oil from the manual pump 1 flows through the second manual valve 12, and manually switch the second manual valve 12;

[0065] At this time, the high-pressure oil of the manual pump 1 connects the oil inlet and outlet of the first hydraulic control directional valve 3-2. The high-pressure oil in the rodless cavity of the luffing cylinder 4 is divided into two low-pressure oils of about 0.5 MPa under the action of the back-pressure valve 3-5 after passing through the first hydraulic control directional valve 3-2 and the first speed control valve 3-3. One low-pressure oil flows back to the rod cavity of the luffing cylinder 4 to replenish the rod cavity of the luffing cylinder, and the other excess hydraulic oil flows back to the oil tank after passing through the back-pressure valve 3-5. The boom is safely lowered at a predetermined speed. In the oil cylinder valve group, the first hydraulic control check valve 3-6 mainly serves to seal the main oil circuit of the luffing cylinder.

[0066] When it is necessary to emergently release the load lifted by the hoisting winch, turn the handle of the manual ball valve 10 so that the pressure oil from the manual pump 1 flows through the first manual valve 11, and manually switch the first manual valve 11; At this time, the high-pressure oil of the manual pump 1 is divided into two paths: one high-pressure oil connects the oil inlet and outlet of the third hydraulic control directional valve 5-5. The high-pressure oil at port B1 of the hydraulic motor 6 returns to the low-pressure side A1 of the hydraulic motor 6 after passing through the third hydraulic control directional valve 5-5 and the second speed control valve 5-6; At the same time, a branch of this high-pressure oil passes through the second shuttle valve 5-9, then flows through the second hydraulic pilot-operated directional valve 5-3 and the one-way pressure reducing valve 5-4, and finally opens the winch brake, and the hoisting winch starts to lower the load.

[0067] In addition, the other high-pressure oil coming out of the first manual valve 11 replenishes the low-pressure side of the hydraulic motor 6 through the oil replenishing valve 5-8 to supplement the hydraulic oil lost due to leakage of the hydraulic motor itself. Prevent the hydraulic motor from being damaged due to vacuum during the high-speed lowering of the load.

[0068] In the oil cylinder luffing cylinder valve group 3, a first speed control valve 3-3 is provided. By adjusting the opening size of the throttle orifice in the first speed control valve 3-3, the emergency lowering speed of the boom can be changed. In the hoisting winch control valve group 5, a second speed control valve 5-6 is provided. By adjusting the opening size of the throttle orifice in the second speed control valve 5-6, the lowering speed of the load lifted by the hoisting winch during emergency lowering can be changed. In the hoisting winch control valve group 5, an oil replenishing valve 5-8 is provided to supplement the hydraulic oil lost due to leakage of the hydraulic motor itself, and prevent the hydraulic motor from being damaged due to air suction during the high-speed lowering of the hoisting winch by gravity.

[0069] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control system for the rapid emergency of a hydraulic crane, comprising a manual pump, an oil cylinder, a hoisting motor and a hydraulic slewing motor; characterized in that, The hoisting motor is connected to the main valve through a winch control valve group; the winch control valve group includes a first shuttle valve, a balance valve, a second hydraulic directional control valve, a one-way pressure reducing valve, a third hydraulic directional control valve, a second speed control valve, a second hydraulic check valve, a second oil replenishing valve and a second shuttle valve; wherein the A port is connected to the A1 port through the second hydraulic directional control valve, and the B port is connected to the B1 port through the balance valve, a first shuttle valve is arranged in parallel between the A-A1 oil circuit and the B-B1 oil circuit, and the middle position of the first shuttle valve is sequentially connected to the second shuttle valve, the second hydraulic directional control valve and the one-way pressure reducing valve; the FL port is sequentially connected to the second oil replenishing valve, the second speed control valve and the third hydraulic directional control valve.

2. The control system for rapid emergency of a hydraulic crane according to claim 1, characterized in that, The said oil cylinder is a luffing oil cylinder.

3. A control system for rapid emergency of a hydraulic crane according to claim 1 or 2, characterized in that, The main valve is provided with an oil cylinder working piece, a winch working piece and a slewing working piece. Among them, the oil cylinder working piece is connected to the oil cylinder through an oil cylinder valve group, and the winch working piece is connected to the hoisting motor through a winch control valve group.

4. A control system for rapid emergency of a hydraulic crane according to claim 2, characterized in that, Among them, the boom is driven by a luffing oil cylinder.

5. A control system for rapid emergency of a hydraulic crane according to claim 2, characterized in that, Among them, an overflow valve is arranged in the main valve, and the overflow valve is arranged in parallel with the oil cylinder working piece, the winch working piece and the slewing working piece.

6. The control system for rapid emergency of a hydraulic crane according to claim 2, wherein The main valve is connected to the fuel tank through an oil return filter.

7. A control system for rapid emergency of a hydraulic crane according to claim 6, characterized in that, There is a manual ball valve on the fuel tank, and the working oil ports of the manual ball valve are directly connected to the first manual valve, the second manual valve, the manual pump and the main valve respectively.

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