A manual emergency operating system for scientific research cranes

Abstract

This invention relates to a manual emergency operating system for a scientific research crane, comprising an emergency operation valve assembly, an accumulator, a winch valve assembly, and a remotely adjustable relief valve assembly. The emergency operation valve assembly is connected to the accumulator and, through the winch valve assembly, to the winch motor and winch brake, for manual emergency operation of the winch motor and winch brake. The remotely adjustable relief valve assembly is connected to the winch valve assembly for remotely adjusting the resistance during load lowering. In an emergency, this invention allows the crane operator to lower the load with low resistance manually, and allows the hook to move away from the crane. This reduces the impact of structural damage to the crane and the impact of load release on the hull. Furthermore, the manual operation allows for assessment of the situation of personnel near the crane, ensuring the safety of on-site personnel.

Description

Technical Field

[0001] This invention relates to a scientific research hydraulic articulated boom telescopic crane, and more particularly to a manual emergency operating system for a scientific research hydraulic articulated boom telescopic crane. Background Technology

[0002] Hydraulic articulated boom telescopic cranes are mainly used for the deployment and retrieval of equipment and the lifting of cargo on research vessels. These cranes are attached to the ship's deck via flanges or welding, and their functions, including rotation, extension, luffing, and lifting, offer advantages such as a small footprint and a large operating area. The lifting function is achieved by a winch installed below the main boom.

[0003] With the global surge in marine development, the application of research cranes is becoming increasingly widespread. However, existing cranes, especially offshore cranes, often experience situations where the hook gets caught on other vessels or fixed objects on the seabed, or the crane's power supply fails, resulting in a loss of power. Due to the movement of the crane's hull relative to other vessels or the seabed caused by waves, the hook can drag the crane, causing overload and leading to structural damage. In severe cases, the crane may even collapse and sink to the seabed along with other vessels or fixed objects, with extremely serious consequences.

[0004] The existing technical solution is available in patent publication number CN108584739A, which includes components such as a pump, accumulator, overflow valve, hydraulic control directional valve, and two-way logic valve, and includes rising mode, falling mode, protection mode and emergency release mode.

[0005] This solution has limitations: 1. In the protection mode, the lowering resistance is entirely 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, requiring three accumulators and a large installation space; 3. There is no liquid filling mode, and liquid filling is troublesome when the accumulator oil pressure is insufficient. Summary of the Invention

[0006] To address the above-mentioned operating conditions, this invention proposes a manual emergency operating system for scientific research cranes. In emergency situations, the crane operator can manually lower the load with low resistance and allow the hook to move away from the crane. This reduces the impact of structural damage on the crane and the impact of load release on the ship's hull. Furthermore, the manual operation allows for assessment of the situation of personnel near the crane, ensuring the safety of on-site personnel.

[0007] To achieve the above objectives, the technical solution of the present invention is: a manual emergency operating 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 winch brake through the winch valve group, for manually operating the winch motor and winch brake in an emergency. The remotely adjustable overflow valve group is connected to the winch valve group for remotely adjusting the resistance of the winch load lowering.

[0008] Furthermore, the emergency operation valve assembly includes a pressure reducing valve, a check valve, a solenoid directional valve, a hydraulic directional 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 assembly. The first throttle valve is used to relieve pressure in the accumulator pressure oil circuit, and the direct-acting relief valve is used to limit the pressure value of the accumulator pressure oil circuit. The first throttle valve is normally in the closed state.

[0009] Furthermore, a check valve and a ball valve are installed sequentially between the accumulator pressure oil circuit and the charging pressure oil port. When the accumulator pressure is insufficient, the ball valve can be opened to charge the accumulator. The ball valve is closed under normal operating conditions. The check valve acts as a reverse shut-off valve to prevent the accumulator pressure oil circuit from depressurizing back to the charging oil circuit during the charging process. A check valve and a pressure reducing valve are installed sequentially between the accumulator pressure oil circuit and the accumulator pressure oil circuit. The check valve acts as a reverse shut-off valve, and the pressure reducing valve can limit the pressure oil supply to a pressure not exceeding the set value of the pressure reducing valve. A first hydraulic control valve is installed between the accumulator pressure oil circuit and the control port of the hydraulic control directional valve of the winch valve group to control the on / off of the pressure oil at the control port of the hydraulic control directional valve of the winch valve group. At the same time, a throttle valve is installed between the pilot control end of the first hydraulic control valve and the accumulator pressure oil circuit to control the opening time of this hydraulic control valve.

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

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

[0012] Furthermore, a two-way logic valve and a second hydraulic control directional valve are installed in the pressure oil circuit on the lowering side of the winch. When the emergency operating system is activated, the connection between the accumulator pressure oil circuit and the oil supply circuit of the multi-way valve B port is cut off. The two-way logic valve is installed in a dedicated socket, and the second hydraulic control valve is installed on top of the two-way logic valve as a pilot valve to control the opening and closing of the pilot port oil circuit of the two-way logic valve.

[0013] Furthermore, the winch valve assembly is equipped with a one-way balance valve in the lifting side oil circuit, which can effectively control the smooth operation of the actuator under load and prevent loss of control due to load changes.

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

[0015] Furthermore, a first check valve and a secondary relief valve are sequentially installed between the oil circuits on both the lowering and raising sides of the winch motor. The secondary relief valve ensures that the pressure difference between the oil circuits on the raising 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 remotely controlled. The first check valve acts as a reverse shut-off valve. A second check 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 leaking back to the external pressure control port.

[0016] Furthermore, a hydraulically controlled directional valve is installed between the pilot control port of the secondary relief valve and the pressure port of the remotely adjustable relief valve. By supplying pressure to the pilot port of the hydraulically controlled two-position two-way valve, the opening and closing of the pressure port of the remotely adjustable relief valve and the pilot port of the secondary relief valve are controlled. A pressure-reducing valve is installed in the control oil circuit between the shuttle valve and the winch brake port, limiting the oil circuit pressure when the brake is opened to a specified value, ensuring stable brake operation. A one-way throttle valve is installed in the control oil circuit between the pressure-reducing valve and the winch brake port, controlling the opening time of the winch brake by adjusting the opening degree of the throttle valve.

[0017] The beneficial effects of this invention are:

[0018] 1. This operating system can be started manually, provided that the safety of personnel near the crane is ensured.

[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 to the ship's deck or other nearby items caused by the lowered load.

[0021] 4. The accumulator can be filled with liquid at any time if the oil pressure is insufficient;

[0022] 5. Compact structure and easy installation. Attached Figure Description

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

[0024] Figure 2 This is the schematic diagram of the existing system without the addition of a manual emergency operating system;

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

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

[0027] Figure 5 This is the main view of the winch valve assembly;

[0028] Figure 6 This is a top view of the winch valve assembly;

[0029] Figure 7 This is a schematic diagram of a remotely adjustable overflow valve assembly;

[0030] In the diagram: 1. Accumulator; 2. Pressure reducing valve; 3-7. Check 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. One-way balance valve; 20. Shuttle valve; 21. Pressure reducing valve; 22. One-way throttle valve; 23. Remotely adjustable relief valve. Detailed Implementation

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

[0032] This invention provides a manual emergency operating system for a scientific research crane, which mainly comprises four parts: an emergency operation valve group, an accumulator 1, a winch valve group (part of which), and a remotely adjustable overflow valve group. The schematic diagram is shown below. Figure 1 As shown. For comparison, the schematic diagram before adding the manual emergency operating system is shown below. Figure 2 As shown in the schematic diagram, components 1-18 and 23 fall within the scope of this invention.

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

[0034] The emergency operation valve assembly includes eight interfaces: A1, T1, Pil, DR1, DR2, C2, Pacc1, and Pacc2. Interface A1 is connected to port B of the multi-way valve winch assembly; interface T1 is connected to the oil tank return port T; interface Pil is connected to the pilot control port Pil of the winch valve assembly; interface DR1 is connected to the oil tank drain port DR1; interface DR2 is connected to the winch valve assembly DR2; interface C2 is connected to the lowering pressure port V1 of the winch valve assembly; interface Pacc1 is connected to the system pressure port P; and interface Pacc2 is connected to accumulator 1 and pressure gauge 16.

[0035] The emergency operation valve group includes a throttle valve 11 and a direct-acting relief valve 13, which are installed in the connecting circuits of the accumulator pressure oil circuit and the return oil circuit, respectively. These valves control the opening and closing 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 closed. A check valve 5 and a ball valve 15 are sequentially installed in the oil circuit between the accumulator pressure oil circuit and port Pacc2. When the accumulator pressure is insufficient, opening the ball valve 15 allows for accumulator filling. The ball valve 15 is normally closed. The check valve 5 acts as a reverse shut-off valve, preventing pressure leakage from the pressure oil circuit to port Pacc2 during accumulator filling. A two-position three-way solenoid valve 8 is installed in the oil circuit between the Pacc1 and A2 ports. Electromagnetic force moves the valve core to change the direction of oil flow. One-way valve 3, pressure reducing valve 2, and one-way valve 4 are sequentially installed in the circuit between the A2 and C2 ports. One-way valves 3 and 4 act as reverse shut-off valves, and pressure reducing valve 2 limits the pressure oil supply to a pressure not exceeding the pressure reducing valve's set value. A two-position four-way hydraulic control valve 9 is installed between the A2 and PIL ports to control the oil circuit reversal. When the valve is in the spring position, the PIL is depressurized; when the valve is in the control position, the PIL port is connected to the A2 port. A throttle valve 12 is installed in the oil circuit between the A2 port and the pilot side of the two-position four-way hydraulic control valve 9 to control the opening time of the reversing valve 9. A two-way logic valve 14 is installed in the oil circuit between the A1 and C2 ports to control the oil circuit's on / off state. A two-position four-way hydraulic control valve 10 is installed on top of the two-way logic valve 14 as its pilot valve, controlling the on / off state of the pilot port oil circuit of the two-way logic valve 14.

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

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

[0038] The winch valve assembly's one-way balance valve 19 is installed in the oil circuit between ports V2 and C2, with its pilot side connected to the C1 oil circuit. This effectively controls the smooth operation of the actuator under load, preventing uncontrolled operation due to load changes. The shuttle valve 20's A and B ports are connected to ports V1 and V2 respectively, and its C port is connected to the winch brake port, ensuring the winch brake can open smoothly when there is pressurized oil in either port A or B. One-way valve 7 and secondary relief valve 17 are sequentially installed in the oil circuit between ports C2 and C1. Secondary relief valve 17 ensures the pressure difference between ports C2 and C1 does not exceed the relief valve's set value, while one-way valve 7 acts as a reverse shut-off valve. One-way valve 6 is installed on the WLS oil circuit and also acts as a reverse shut-off valve. A 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 valve's pilot port is connected to PIL, and the drain port is connected to Dr2. The connection between the P oil circuit and the pilot port of the secondary relief valve can be controlled by whether or not pressurized oil is supplied to the PIL pilot port. A pressure reducing valve 21 is installed in the control oil circuit between the shuttle valve 20 and the winch brake port, limiting the oil circuit pressure for opening the brake to a specified value to ensure stable brake operation. A one-way throttle valve 22 is installed in the control oil circuit between the pressure reducing valve 21 and the winch brake port, controlling the opening time of the winch brake by adjusting the opening degree of the throttle valve. See details... Figure 4 .

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

[0040] When the crane winch is lifting normally, oil enters through port A of the multi-way valve winch connection. Pressurized oil enters the winch valve group through interface V2, then through the one-way valve of the one-way balance valve 19, and enters port A of the winch motor. Simultaneously, pressurized oil enters the winch brake port through shuttle valve 20, reversing valve 21, and one-way throttle valve 22, releasing the brake and enabling the winch to lift. Return oil enters port C2 of the emergency operation valve group through port B of the winch motor and the winch motor valve group. Since the control chamber pressure 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. The return oil returns to the oil tank through port A1 via the two-way logic valve 14. Simultaneously, oil enters through port MO of the multi-way valve, and pressurized oil is pressurized through check valve 7 to the control port of the secondary relief valve 17, which is in the closed state.

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

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

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

[0044] Pressurized oil enters the control port of the 2-position 4-way hydraulic control valve 9 via the throttle valve 12, pushing the hydraulic control valve 9 from the right position to the left position. Pressurized oil then enters the control port of the 2-position 2-way hydraulic control valve 18 in the winch motor valve assembly via the left position of the hydraulic control valve 9, pushing the hydraulic control valve 18 from the right position to the left position. The oil path of the control port of the secondary relief valve 17 is connected to the remotely adjustable relief valve 23 via the hydraulic control valve 18. Thus, the set pressure value of the secondary relief valve 17, originally determined by port P, is now determined by the set pressure value of the remotely adjustable relief valve 23. As mentioned above, this pressure value is only 10%-25% of the pressure set value of the secondary relief valve 17 itself.

[0045] The pressurized oil passes sequentially through check valve 3, pressure reducing valve 2, and check valve 4 to reach port C2 of the emergency operation valve group. The pressurized oil then enters the control port of the two-way logic valve 14 from the left position of the hydraulic control valve 10. Under the pressure at the control port, the valve core of the two-way logic valve 14 is firmly locked onto the valve seat, cutting off the oil circuit from emergency operation valve group C2 to emergency operation valve group A1. Simultaneously, the pressurized oil passes through port V1, shuttle valve 20, pressure reducing valve 21, and one-way throttle valve 22 to enter the winch brake port, opening the winch brake. As mentioned earlier, the set pressure of the secondary relief valve 17 is only 10% to 25% of the normal set pressure value, and the pressure at port V1 is less than 40 bar, making it impossible to open the one-way balance valve 19. The hydraulic oil circulates between motor port A, secondary relief valve 17, and motor port B, causing the winch to perform a low-resistance lowering action under external load.

[0046] During emergency crane operation, the accumulator pressure oil serves four purposes: 1. It reduces the pressure setting of the secondary relief valve 17 to 10%–25% of its original value; 2. It closes the two-way logic valve 14, cutting off the oil circuit from A1 to V2 to prevent possible leakage of accumulator pressure oil through port A1; 3. It opens the winch brake; 4. It replenishes the oil leakage loss during the winch motor's lowering process. After the crane's emergency operation function is activated, the winch performs a low-resistance lowering action under external load, thus protecting the crane and reducing the impact that the load lowering may cause to the hull or deck.

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

[0048] While the present invention has been disclosed above with reference to preferred embodiments, these embodiments do not limit the invention. Any equivalent changes or modifications made without departing from the spirit and scope of the invention are also within the scope of protection of the invention. Therefore, the scope of protection of the present invention should be determined 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 assembly, an accumulator, a winch valve assembly, and a remotely adjustable relief valve assembly. The emergency operation valve assembly is connected to the accumulator and, through the winch valve assembly, to the winch motor and winch brake, for manual emergency operation of the winch motor and winch brake. The remotely adjustable relief valve assembly is connected to the winch valve assembly for remotely adjusting the resistance of the winch load lowering. The emergency operation valve assembly includes a pressure reducing valve, a check valve, a solenoid directional valve, a hydraulically controlled directional 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 assembly. The first throttle valve is used to relieve pressure in the accumulator pressure oil circuit, and the direct-acting relief valve is used to limit the pressure value in the accumulator pressure oil circuit. The first throttle valve is normally closed.

2. The manual emergency operating system for a scientific research crane according to claim 1, characterized in that: A check valve and a ball valve are installed sequentially between the accumulator pressure oil circuit and the charging pressure oil port. When the accumulator pressure is insufficient, the ball valve can be opened to charge the accumulator. The ball valve is closed under normal operating conditions. The check valve acts as a reverse shut-off valve to prevent the accumulator pressure oil circuit from depressurizing back to the charging oil circuit during the charging process. A check valve and a pressure reducing valve are installed sequentially between the accumulator pressure oil circuit and the winch valve group. The check valve acts as a reverse shut-off valve, and the pressure reducing valve can limit the pressure oil supply to a pressure not exceeding the set value of the pressure reducing valve. A first hydraulic control valve is installed between the accumulator pressure oil circuit and the control port of the winch valve group's hydraulic control directional valve to control the on / off of the pressure oil at the control port of the winch valve group's hydraulic control directional valve. At the same time, a throttle valve is installed between the pilot control end of the first hydraulic control valve and the accumulator pressure oil circuit to control the opening time of this hydraulic control valve.

3. The manual emergency operating system for a scientific research crane according to claim 1, characterized in that: A solenoid valve is installed on the accumulator pressure oil circuit. When the manual emergency operating system is activated, the solenoid directional valve is switched to supply oil from the accumulator pressure oil circuit to the normal descent side pressure oil circuit. The accumulator and pressure gauge are connected to the accumulator interface of the manual emergency operation valve group to provide pressure oil source for the manual emergency operating system and display the real-time pressure value of the accumulator.

4. The manual emergency operating system for a scientific research crane according to claim 1, characterized in that: The winch valve assembly includes a check valve, a secondary relief valve, a hydraulically controlled directional valve, a one-way balance valve, a shuttle valve, a pressure reducing valve, and a one-way throttle valve. The remotely adjustable relief valve assembly is connected to the control port of the secondary relief valve through the hydraulically controlled directional valve of the winch valve assembly. When the hydraulically controlled directional valve is opened, the pressure at the control port of the secondary relief valve is regulated.

5. The manual emergency operating system for a scientific research crane according to claim 4, characterized in that: A two-way logic valve and a second hydraulic control directional valve are installed in the pressure oil circuit on the lowering side of the winch. When the emergency operating system is activated, the connection between the accumulator pressure oil circuit and the oil supply circuit of port B of the multi-way valve is cut off. The two-way logic valve is installed in a special socket, and the second hydraulic control valve is installed on top of the two-way logic valve as a pilot valve to control the opening and closing of the pilot port oil circuit of the two-way logic valve.

6. The manual emergency operating system for a scientific research crane according to claim 4, characterized in that: The winch valve assembly is equipped with a one-way balance valve in the lifting side oil circuit, which can effectively control the smooth operation of the actuator under load and prevent the loss of control due to load changes.

7. The manual emergency operating system for a scientific research crane according to claim 4, characterized in that: A shuttle valve is installed between the winch lifting oil circuit and the lowering oil circuit in the winch valve assembly. It is used 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.

8. The manual emergency operating system for a scientific research crane according to claim 4, characterized in that: A first check valve and a secondary relief valve are installed sequentially between the oil circuits on both the lowering and raising sides of the winch motor. The secondary relief valve ensures that the pressure difference between the oil circuits on the raising 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 remotely controlled. The first check valve acts as a reverse shut-off valve. A second check 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 leaking back to the external pressure control port.

9. The manual emergency operating system for a scientific research crane according to claim 4, characterized in that: The hydraulically controlled directional valve is installed between the pilot control port of the secondary relief valve and the pressure port of the remotely adjustable relief valve. By supplying pressure to the pilot port of the hydraulically controlled two-position two-way valve, the opening and closing of the pressure port of the remotely adjustable relief valve and the pilot port of the secondary relief valve are achieved. The pressure reducing valve is installed in the control oil circuit between the shuttle valve and the winch brake port, limiting the oil circuit pressure when the brake is opened to not exceed the specified value, ensuring stable brake operation. The one-way throttle valve is installed in the control oil circuit between the pressure reducing valve and the winch brake port, controlling the opening time of the winch brake by adjusting the opening degree of the throttle valve.

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