Manual emergency operation system for scientific investigation crane

Abstract

The manual emergency operation system comprises an emergency operation valve group, an energy accumulator, a winch valve group and a remote adjustable overflow valve group, the emergency operation valve group is connected with the energy accumulator and is connected with a winch motor and a winch brake through the winch valve group, and the manual emergency operation system is used for manually and emergently operating the winch motor and the winch brake; and the remote adjustable overflow valve group is connected with the winch valve group and is used for remotely adjusting the lowering resistance of the winch load. In an emergency state, a crane operator can realize low-resistance lowering of a load in a manual operation manner, and a lifting hook is allowed to be far away from the crane. Therefore, the influence of structural damage on the crane can be reduced, the impact of load release on a ship body is reduced, meanwhile, a manual operation mode is adopted, the conditions of personnel near the crane can be judged, and the safety of field personnel is guaranteed.

Description

Technical Field

[0001] The invention relates to a scientific research hydraulic folding arm telescopic crane, in particular to a manual emergency operation system for the scientific research hydraulic folding arm telescopic crane. Background Art

[0002] The scientific research hydraulic folding arm telescopic crane is mainly used for the deployment and recovery of equipment on scientific research ships and the lifting of cargo. The folding arm telescopic crane is attached to the ship deck through flanges or welding. With the functions of rotation, telescopic, luffing, rotation and lifting, it has the advantages of small space occupation and large operating area. Among them, the lifting function is realized by the winch installed under the basic arm.

[0003] With the advent of the world's ocean development boom, scientific research cranes are being used more and more widely. Existing cranes, especially offshore cranes, may have hooks caught by other ships or fixed objects on the seabed during use, and the crane power supply may fail and lose power. Due to the movement of the crane's hull relative to other ships or the seabed under the action of waves, the hook will drag the crane and overload the crane, causing damage to the crane structure, or even the crane collapses and sinks to the seabed with other ships or fixed objects, with very serious consequences.

[0004] The existing technical solution is shown in patent publication number CN108584739A, which includes components such as a pump, an accumulator, a relief valve, a hydraulically controlled reversing valve, a two-way logic valve, etc., and includes an ascending mode, a descending mode, a protection mode and an emergency lowering mode.

[0005] This solution has limitations: 1. In the protection mode, the lowering resistance is completely determined by the pressure of the balance valve and the accumulator, and the resistance cannot be adjusted at any time; 2. The system is complex and contains many components, so three accumulators are needed, requiring a large installation space; 3. There is no filling mode, and when the accumulator oil pressure is insufficient, filling is more troublesome. Summary of the invention

[0006] In view of the above working conditions, the present invention proposes a manual emergency operation system for scientific research cranes. In an emergency, the crane operator can use manual operation to achieve low-resistance lowering of the load and allow the hook to be away from the crane. This can reduce the impact of structural damage on the crane and reduce the impact of load release on the hull. At the same time, the manual operation method can also determine the status of personnel near the crane to ensure the safety of on-site personnel.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is: a manual emergency operation system for a scientific research crane, comprising an emergency operation valve group, an accumulator, a winch valve group and a remotely adjustable overflow valve group. The emergency operation valve group is connected to the accumulator, and is connected to the winch motor and the winch brake through the winch valve group, and is used for manual emergency operation of the winch motor and the winch brake; the remotely adjustable overflow valve group is connected to the winch valve group, and is used for remotely adjusting the resistance of the winch load lowering.

[0008] Furthermore, the emergency operation valve group includes a pressure reducing valve, a one-way valve, an electromagnetic reversing valve, a hydraulically controlled reversing valve, a throttle valve, a direct-acting overflow valve, a two-way logic valve, and a ball valve. A first throttle valve and a direct-acting overflow valve are installed between the accumulator pressure oil circuit and the return oil circuit in the emergency operation valve group. The first throttle valve is used to relieve pressure in the accumulator pressure oil circuit, and the direct-acting overflow valve is used to limit the pressure value of the accumulator pressure oil circuit. The first throttle valve is normally in a closed state.

[0009] Furthermore, a one-way valve and a ball valve are installed in sequence between the accumulator pressure oil circuit and the oil charging pressure oil port. When the accumulator pressure is insufficient, the accumulator can be filled with liquid by opening the ball valve. The ball valve is in a closed state under normal working conditions, and the one-way valve plays a reverse cut-off role to prevent the accumulator pressure oil circuit from relieving pressure to the charging oil circuit in the process of accumulator filling; a one-way valve and a pressure reducing valve are installed in sequence on the accumulator pressure oil circuit. The one-way valve plays a reverse cut-off role, and the pressure reducing valve can limit the pressure oil to be supplied at a pressure not higher than the set value of the pressure reducing valve; a first hydraulically controlled valve is installed between the accumulator pressure oil circuit and the control port of the hydraulically controlled reversing valve of the winch valve group, which is used to control the on and off of the pressure oil at the control port of the hydraulically controlled reversing valve of the winch valve group; at the same time, a throttle valve is installed on the pilot control end of the first hydraulically controlled valve and the accumulator pressure oil circuit, which is used to control the opening time of this hydraulically controlled valve.

[0010] Furthermore, an electromagnetic valve is installed on the accumulator pressure oil circuit. When the manual emergency operating system is activated, the electromagnetic reversing valve is switched to supply oil from the accumulator pressure oil circuit to the normal descending side pressure oil circuit; the accumulator and the pressure gauge are connected to the accumulator interface of the manual emergency operating valve group to provide a pressure oil source for the manual emergency operating system and display the real-time pressure value of the accumulator.

[0011] Furthermore, the winch valve group includes a one-way valve, a secondary relief valve, a hydraulically controlled reversing valve, a one-way balancing valve, a shuttle valve, a pressure reducing valve and a one-way throttle valve. The remotely adjustable relief valve group is connected to the secondary relief valve control port through the hydraulically controlled reversing valve of the winch valve group. When the hydraulically controlled reversing valve is opened, the pressure at the secondary relief valve control port is regulated.

[0012] Furthermore, a two-way logic valve and a second hydraulically controlled reversing valve are installed in the pressure oil circuit on the descent side of the winch, which are used to cut off the connection between the accumulator pressure oil circuit and the oil supply circuit of port B of the multi-way valve when the emergency operating system is activated. The two-way logic valve is installed in a special jack, and the second hydraulically controlled valve is installed on the top of the two-way logic valve as a pilot valve of the two-way logic valve to control the on-off of the pilot port oil circuit of the two-way logic valve.

[0013] Furthermore, a one-way balancing valve is installed in the oil circuit on the lifting side of the winch valve group, which can effectively control the smooth movement of the actuator under the action of load and prevent the loss of control caused by load changes.

[0014] Furthermore, a shuttle valve is installed between the winch lifting oil circuit and the lowering oil circuit of the winch valve group to receive fluid flow from the oil circuits on both sides of the winch lifting / lowering and transmit the highest pressure to the winch brake to ensure that the brake can be opened smoothly when the winch is working.

[0015] Furthermore, a first one-way valve and a secondary relief valve are installed in sequence between the oil circuits on both sides of the drawworks motor for lowering / lifting. The secondary relief valve can ensure that the pressure difference between the oil circuits on the rising and lowering sides of the interface drawworks motor does not exceed the pressure setting value of the relief valve. This pressure setting value can be controlled remotely, and the first one-way valve plays a reverse cutoff role; a second one-way valve is installed between the control port of the secondary relief valve and the external pressure control port to prevent the pressure oil at the control port of the relief valve from being discharged in the reverse direction to the external pressure control port.

[0016] Furthermore, the hydraulically controlled reversing valve is installed between the pilot control port of the secondary relief valve and the pressure oil port of the remote adjustable relief valve. By supplying pressure to the pilot port of the hydraulically controlled two-position two-way valve, the pressure oil port of the remote adjustable relief valve and the pilot port of the secondary relief valve are switched on and off. The pressure reducing valve is installed in the control oil circuit between the shuttle valve and the brake port of the winch brake to limit the oil circuit pressure of the brake to not exceed the specified value, thereby ensuring stable operation of the brake. The one-way throttle valve is installed in the control oil circuit between the pressure reducing valve and the brake port of the winch brake. By adjusting the opening size of the throttle valve, the opening time of the winch brake is controlled.

[0017] The beneficial effects of the present invention are:

[0018] 1. By manual operation, the operating system can be started under the premise of ensuring the safety of personnel near the crane;

[0019] 2. Lowering the load with low resistance can ensure the safety of the main structure of the crane to the greatest extent, and the resistance can be adjusted remotely at any time;

[0020] 3. It can reduce the impact damage of the lowered load on the hull deck or other nearby objects.

[0021] 4. When the accumulator oil pressure is insufficient, it can be filled at any time;

[0022] 5. Compact structure and easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the manual emergency operating system for scientific research crane of the present invention;

[0024] Figure 2 It is the schematic diagram of the existing emergency operation system without adding a manual emergency operation system;

[0025] Figure 3 This is the main view of the emergency operation valve group;

[0026] Figure 4 This is the left view of the emergency operation valve group;

[0027] Figure 5 This is the front view of the winch valve group;

[0028] Figure 6 It is a top view of the winch valve group;

[0029] Figure 7 It is a schematic diagram of a remote adjustable relief valve group;

[0030] In the figure: 1. accumulator; 2. pressure reducing valve; 3-7. non-return valve; 8. two-position three-way solenoid valve; 9, 10. two-position four-way hydraulic control valve; 11, 12. throttle valve; 13. direct-acting relief valve; 14. two-way logic valve; 15. ball valve; 16. pressure gauge; 17. secondary relief valve; 18. two-position two-way hydraulic control valve; 19. non-return balancing valve; 20. shuttle valve; 21. pressure reducing valve; 22. non-return throttle valve; 23. remote adjustable relief valve. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] The embodiment of the present invention provides a manual emergency operating system for a scientific research crane, which mainly includes an emergency operation valve group, an accumulator 1, a winch valve group (a part of it) and a remote adjustable relief valve group. The schematic diagram is shown in FIG. Figure 1 As a comparison, the schematic diagram before adding the manual emergency operating system is as follows Figure 2 As shown in the schematic diagram, it can be seen that components 1 to 18, 23 belong to the scope of the present invention.

[0033] The emergency operation valve group is a new valve group installed at the tail of the crane. Figure 3 , as shown in 4. It includes a pressure reducing valve 2, three one-way valves 3 to 5, a two-position three-way solenoid valve 8, two two-position four-way hydraulic control valves 9 and 10, two throttle valves 11 and 12, a direct-acting relief valve 13, a two-way logic valve 14, and a ball valve 15.

[0034] The emergency operation valve group includes 8 interfaces, namely A1, T1, Pil, DR1, DR2, C2, Pacc1 and Pacc2. Among them, the A1 interface is connected to the B port of the multi-way valve winch; the T1 interface is connected to the oil return port T of the oil tank; the Pil interface is connected to the pilot control port Pil of the winch valve group; the DR1 interface is connected to the oil drain port DR1 of the oil tank; the DR2 interface is connected to the winch valve group DR2; the C2 interface is connected to the pressure port V1 at the lower end of the winch valve group; the Pacc1 interface is connected to the system pressure oil port P; and the Pacc2 interface is connected to the accumulator 1 and the pressure gauge 16.

[0035] The throttle valve 11 and the direct-acting relief valve 13 of the emergency operation valve group are respectively installed in the connecting circuits of the accumulator pressure oil circuit and the return oil circuit, and are respectively used to control the on-off of the accumulator pressure oil circuit and the return oil circuit and limit the pressure value of the accumulator pressure oil circuit to not exceed the set pressure. The throttle valve 11 is normally in a closed state. The one-way valve 5 and the ball valve 15 are successively installed in the oil circuit between the accumulator pressure oil circuit and the oil port Pacc2. When the accumulator pressure is insufficient, the accumulator can be filled with liquid by opening the ball valve 15. The ball valve 15 is in a closed state under normal working conditions. The one-way valve 5 plays a reverse cut-off role to prevent the pressure oil circuit from releasing pressure to the oil port Pacc2 during the accumulator filling process. The two-position three-way solenoid valve 8 is installed in the oil circuit between the Pacc1 interface and the A2 interface. The electromagnetic force pushes the valve core to move to change the direction of oil flow. The one-way valve 3, the pressure reducing valve 2 and the one-way valve 4 are sequentially installed in the circuit between the A2 interface and the C2 interface. The one-way valves 3 and 4 play a reverse cutoff role. The pressure reducing valve 2 can limit the pressure oil to be supplied at a pressure not higher than the set value of the pressure reducing valve. The two-position four-way hydraulic control valve 9 is installed between the A2 interface and the PIL interface to control the reversing of the oil circuit. When the valve is in the spring position, the PIL pressure is released; when the valve is in the control position, the PIL interface is connected to the A2 interface. The throttle valve 12 is installed in the oil circuit between the A2 interface and the pilot side of the two-position four-way hydraulic control valve 9 to control the opening time of the reversing valve 9. The two-way logic valve 14 is installed in the oil circuit between the A1 interface and the C2 interface to control the on-off of the oil circuit. The two-position four-way hydraulic control valve 10 is installed on the top of the two-way logic valve 14 as the pilot valve of the two-way logic valve 14 to control the on-off of the pilot port oil circuit of the two-way logic valve 14.

[0036] The winch valve group is a modified valve group and is installed near the winch. Figure 5 , 6. It includes two one-way valves 6 and 7, one secondary relief valve 17, one two-position two-way hydraulic control valve 18, one one-way balancing valve 19, one shuttle valve 20, one pressure reducing valve 21 and one-way throttle valve 22. Among them, the one-way balancing valve 19, the shuttle valve 20, the pressure reducing valve 21 and the one-way throttle valve 22 are the original components of the winch valve group, while the one-way valves 6 and 7, the secondary relief valve 17 and the two-position two-way hydraulic control valve 18 are the newly added functions of the winch valve group.

[0037] The winch valve group includes nine interfaces, namely, P, Pil, WLS, V1, V2, C1, C2, Dr2 and Br. Among them, interface P is connected to the P port of the remote adjustable relief valve group; interface Pil is connected to the Pil port of the emergency operation valve group; interface WLS is connected to the multi-way valve winch MO; interfaces V1 and V2 are respectively connected to the A port of the emergency operation valve group C2 and the multi-way valve winch; interfaces C1 and C2 are respectively connected to the B and A ports of the winch motor; interface Dr2 is connected to the Dr2 port of the emergency operation valve group; and interface Br is connected to the brake port of the winch brake.

[0038] The winch valve group one-way balance valve 19 is installed in the oil circuit between interfaces V2 and C2, and the pilot side is connected to the C1 oil circuit, which can effectively control the actuator to move smoothly under the load and prevent the loss of control due to the influence of load changes. The A and B ports of the shuttle valve 20 are connected to the interfaces V1 and V2 respectively, and the C port is connected to the brake port of the winch brake, so that when there is pressure oil in either A or B ports, the winch brake can be opened smoothly. The one-way valve 7 and the secondary relief valve 17 are installed in the oil circuit between interfaces C2 and C1 in sequence. The secondary relief valve 17 can ensure that the pressure difference between interfaces C2 and C1 does not exceed the set value of the relief valve, and the one-way valve 7 plays a reverse cut-off role. The one-way valve 6 is installed on the oil circuit WLS and plays a reverse cut-off role. The hydraulically controlled two-position two-way valve 18 is installed in the oil circuit between the pilot control port and the P port of the secondary relief valve 17. The pilot port of the valve is connected to PIL, and the oil drain port is connected to Dr2. The P oil circuit and the pilot port of the secondary relief valve can be opened and closed by supplying pressurized oil to the PIL pilot port. The pressure reducing valve 21 is installed in the control oil circuit between the shuttle valve 20 and the brake port of the winch brake to limit the oil circuit pressure for opening the brake to not exceed the specified value, thereby ensuring stable operation of the brake. The one-way throttle valve 22 is installed in the control oil circuit between the pressure reducing valve 21 and the brake port of the winch brake to control the opening time of the winch brake by adjusting the opening size of the throttle valve. See details. Figure 4 .

[0039] The remote adjustable relief valve group is installed at the tail of the crane. Figure 7 As shown, it includes a remote adjustable relief valve 23, which adopts a plate structure and is installed with the valve seat and the bottom plate by bolts. The P port of the valve group is connected to the P port of the winch valve group, and the T port is connected to the T port of the oil tank. The remote adjustable relief valve is used to control the pressure of the P port of the winch valve group not to exceed the set value of the relief valve. This value can be adjusted remotely at any time, generally 10%-25% of the pressure setting value of the secondary relief valve 19.

[0040] When the crane winch is lifting normally, the multi-way valve winch joint A port enters oil, and the pressure oil enters the winch valve group through the interface V2, and then enters the A port of the winch motor through the one-way valve of the one-way balance valve 19. At the same time, the pressure oil enters the brake port of the winch brake through the shuttle valve 20, the reversing valve 21 and the one-way throttle valve 22, and the brake is released, and the winch realizes the lifting action. The return oil enters the C2 port of the emergency operation valve group through the B port of the winch motor and the winch motor valve group. Since the pressure in the control chamber of the two-way logic valve 14 is 0, the valve core of the two-way logic valve 14 opens under the action of the return oil, and the return oil returns to the oil tank through the two-way logic valve 14 and the A1 port. At the same time, the multi-way valve MO port enters oil, and the pressure oil is pressurized to the control port of the secondary relief valve 17 through the one-way valve 7, and the secondary relief valve 17 is in a closed state.

[0041] When the crane winch is lowered normally, oil enters the B port of the winch joint of the multi-way valve. Since the pressure in the control chamber of the two-way logic valve 14 is 0, the valve core of the two-way logic valve 14 opens under the action of the pressure oil, and the pressure oil passes through the V1 port of the winch motor valve group through the two-way logic valve 14 and enters the B port of the winch motor. At the same time, the pressure oil passes through the shuttle valve 20, the pressure reducing valve 21 and the one-way throttle valve 22 to release the winch brake, and the one-way balance valve 19 opens under the action of the pressure oil in the control chamber, and the winch is lowered. The return oil returns to the oil tank through the A port of the winch motor and the one-way balance valve 19 of the winch motor valve group. At the same time, oil enters the MO port of the multi-way valve, and the pressure oil is pressurized to the control port of the secondary relief valve 17 through the one-way valve 7, and the secondary relief valve 17 is in a closed state.

[0042] When the manual emergency operation function of the crane is activated, the two-position three-way solenoid valve 8 is energized, the solenoid valve switches from the right position to the left position, and the accumulator pressure oil passes through the two-position three-way solenoid valve 8 and enters the A2 port of the emergency operation valve group.

[0043] The hydraulic control valve 10 is switched from the right position to the left position under the action of the pressure oil at the control port.

[0044] The pressure oil enters the control port of the two-position four-way hydraulic control valve 9 through the throttle valve 12, pushing the hydraulic control valve 9 to switch from the right position to the left position. The pressure oil enters the control port of the two-position two-way hydraulic control valve 18 in the winch motor valve group through the left position of the hydraulic control valve 9, pushing the hydraulic control valve 18 to switch from the right position to the left position. The control port oil circuit of the secondary relief valve 17 is connected to the remote adjustable relief valve 23 through the hydraulic control valve 18, so that the set pressure value of the secondary relief valve 17 is originally determined by the P port, and is changed to be determined by the set pressure value of the remote adjustable relief valve 23. According to the above, this pressure value is only 10%-25% of the pressure setting value of the secondary relief valve 17 itself.

[0045] The pressure oil passes through the check valve 3, the pressure reducing valve 2 and the check valve 4 in sequence and reaches the emergency operation valve group C2 port. The pressure oil enters the control port of the two-way logic valve 14 from the left position of the hydraulic control valve 10. In this way, the valve core of the two-way logic valve 14 is firmly locked on the valve seat under the pressure of the control port, and the oil path from the emergency operation valve group C2 to the emergency operation valve group A1 is cut off. At the same time, the pressure oil enters the brake port of the winch brake through the V1 port, the shuttle valve 20, the pressure reducing valve 21, and the one-way throttle valve 22 to open the winch brake. As mentioned above, the setting pressure of the secondary relief valve 17 is only 10% to 25% of the normal setting pressure value, and the V1 port is less than 40 bar, which cannot open the one-way balance valve 19. The hydraulic oil circulates between the motor A port, the secondary relief valve 17 and the motor B port, and the winch performs a low-resistance lowering action under the action of the external load.

[0046] During the emergency operation of the crane, the accumulator pressure oil has four functions: 1. Reduce the pressure setting value of the secondary relief valve 17 to 10% to 25% of the original; 2. Close the two-way logic valve 14, cut off the oil circuit from A1 to V2, and avoid the possibility of leakage of the accumulator pressure oil through the A1 port; 3. Open the winch brake; 4. Supplement the oil leakage loss during the lowering process of the winch motor. After the crane emergency operation function is activated, the winch performs a low-resistance lowering action under the action of the external load, which protects the crane and reduces the impact of the load lowering on the hull or deck.

[0047] When the accumulator pressure gauge 16 shows insufficient pressure, the accumulator needs to be pre-charged with pressure oil. Open the ball valve 15 and charge the accumulator through the system pressure oil port P. When the pressure gauge 16 shows that the pressure meets the required pressure, close the ball valve 15.

[0048] Although the present invention has been disclosed as above with preferred embodiments, the embodiments do not limit the present invention. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the content defined by the claims of this application.

Claims

1. A manual emergency operating system for a scientific research crane, characterized in that: It includes an emergency operation valve group, an accumulator, a winch valve group and a remote adjustable relief valve group. The emergency operation valve group is connected to the accumulator, and is connected to the winch motor and the winch brake through the winch valve group, and is used for manual emergency operation of the winch motor and the winch brake; the remote adjustable relief valve group is connected to the winch valve group, and is used for remotely adjusting the resistance of the winch load lowering.

2. The manual emergency operating system for a scientific research crane according to claim 1, characterized in that: The emergency operation valve group includes a pressure reducing valve, a one-way valve, an electromagnetic reversing valve, a hydraulically controlled reversing valve, a throttle valve, a direct-acting relief valve, a two-way logic valve, and a ball valve. A first throttle valve and a direct-acting relief valve are installed between the accumulator pressure oil circuit and the return oil circuit in the emergency operation valve group. The first throttle valve is used for relieving pressure in the accumulator pressure oil circuit, and the direct-acting relief valve is used for limiting the pressure value of the accumulator pressure oil circuit. The first throttle valve is normally in a closed state.

3. The manual emergency operating system for a scientific research crane according to claim 2 is characterized in that: A one-way valve and a ball valve are installed in sequence between the accumulator pressure oil circuit and the oil charging pressure oil port. When the accumulator pressure is insufficient, the accumulator can be filled with liquid by opening the ball valve. The ball valve is in a closed state under normal working conditions, and the one-way valve plays a reverse cut-off role to prevent the accumulator pressure oil circuit from relieving pressure to the charging oil circuit in the process of accumulator filling; a one-way valve and a pressure reducing valve are installed in sequence on the accumulator pressure oil circuit. The one-way valve plays a reverse cut-off role, and the pressure reducing valve can limit the pressure oil to be supplied at a pressure not higher than the set value of the pressure reducing valve; a first hydraulically controlled valve is installed between the accumulator pressure oil circuit and the control port of the hydraulically controlled reversing valve of the winch valve group, which is used to control the on and off of the pressure oil at the control port of the hydraulically controlled reversing valve of the winch valve group; at the same time, a throttle valve is installed at the pilot control end of the first hydraulically controlled valve and the accumulator pressure oil circuit, which is used to control the opening time of this hydraulically controlled valve.

4. The manual emergency operation system for scientific research crane according to claim 2 is characterized in that: An electromagnetic valve is installed on the accumulator pressure oil circuit. When the manual emergency operating system is activated, the electromagnetic reversing valve is switched to supply oil from the accumulator pressure oil circuit to the normal descending side pressure oil circuit. The accumulator and the pressure gauge are connected to the accumulator interface of the manual emergency operating valve group to provide a pressure oil source for the manual emergency operating system and display the real-time pressure value of the accumulator.

5. The manual emergency operation system for scientific research crane according to claim 2, characterized in that: The winch valve group includes a one-way valve, a secondary relief valve, a hydraulically controlled reversing valve, a one-way balancing valve, a shuttle valve, a pressure reducing valve and a one-way throttle valve. The remotely adjustable relief valve group is connected to the control port of the secondary relief valve through the hydraulically controlled reversing valve of the winch valve group. When the hydraulically controlled reversing valve is opened, the pressure at the control port of the secondary relief valve is regulated.

6. The manual emergency operation system for scientific research crane according to claim 5, characterized in that: A two-way logic valve and a second hydraulically controlled reversing valve are installed in the pressure oil circuit on the descent side of the winch, which are used to cut off the connection between the accumulator pressure oil circuit and the oil supply circuit of port B of the multi-way valve when the emergency operating system is activated. The two-way logic valve is installed in a special jack, and the second hydraulically controlled valve is installed on the top of the two-way logic valve as a pilot valve of the two-way logic valve to control the on-off of the pilot port oil circuit of the two-way logic valve.

7. The manual emergency operation system for scientific research crane according to claim 5, characterized in that: A one-way balancing valve is installed in the oil circuit on the lifting side of the winch valve group, which can effectively control the actuator to move smoothly under the action of load and prevent the loss of control caused by load changes.

8. The manual emergency operation system for a scientific research crane according to claim 5, characterized in that: A shuttle valve is installed between the winch lifting oil circuit and the lowering oil circuit of the winch valve group to receive the fluid flow from the oil circuits on both sides of the winch lifting / lowering and transmit the highest pressure to the winch brake to ensure that the brake can be opened smoothly when the winch is working.

9. The manual emergency operation system for a scientific research crane according to claim 5, characterized in that: The first one-way valve and the secondary relief valve are installed in sequence between the oil circuits on both sides of the winch motor for lowering / lifting. The secondary relief valve can ensure that the pressure difference between the oil circuits on the rising and lowering sides of the interface winch motor does not exceed the pressure setting value of the relief valve. This pressure setting value can be controlled remotely, and the first one-way valve plays a reverse cut-off role; a second one-way valve is installed between the control port of the secondary relief valve and the external pressure control port to prevent the pressure oil at the control port of the relief valve from being discharged in the reverse direction to the external pressure control port.

10. The manual emergency operation system for a scientific research crane according to claim 5, characterized in that: The hydraulically controlled reversing valve is installed between the pilot control port of the secondary relief valve and the pressure oil port of the remote adjustable relief valve. The on-off of the pressure oil port of the remote adjustable relief valve and the pilot port of the secondary relief valve is realized by supplying pressure to the pilot port of the hydraulically controlled two-position two-way valve. The pressure reducing valve is installed in the control oil circuit between the shuttle valve and the brake port of the winch brake to limit the oil circuit pressure of the brake to not exceed the specified value to ensure stable operation of the brake. The one-way throttle valve is installed in the control oil circuit between the pressure reducing valve and the brake port of the winch brake. The opening time of the winch brake is controlled by adjusting the opening size of the throttle valve.

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