Constant-thrust closed servo control loop

Abstract

The invention discloses a constant-thrust closed servo control loop which comprises an oil tank, a first hydraulic cylinder and a second hydraulic cylinder, the oil tank is communicated with a first oil suction filter and a second oil suction filter, the first oil suction filter is connected with a first one-way valve, the second oil suction filter is connected with a second one-way valve, and a two-way hydraulic pump is arranged between the first one-way valve and the second one-way valve. The first one-way valve is connected with a first overflow valve and a third one-way valve, the first overflow valve is provided with a first overflow pressure value, the third one-way valve is connected with a first two-position two-way electromagnetic reversing valve, upper connectors of the first hydraulic cylinder and the second hydraulic cylinder are connected with the third one-way valve, the second one-way valve is connected with a second overflow valve and a fourth one-way valve, and the second overflow valve is provided with a second overflow pressure value. According to the telescopic platform, the telescopic platform is made to stretch out and draw back along with waves all the time, and boarding personnel can safely embark the offshore wind power platform. The telescopic platform has the advantages that the telescopic platform can stretch out and draw back along with waves all the time, and the offshore wind power platform can be safely embarked by the boarding personnel.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power platform boarding, and in particular to a constant thrust closed servo control loop. Background Art

[0002] Offshore wind resource conditions are better than onshore, and the power generation efficiency is high. Compared with land, the average wind speed at sea is higher and the current is lower, which is conducive to increasing the power and annual utilization hours of wind turbines. The development of offshore wind farms does not need to consider the impact of terrain and adjacent buildings, nor is it restricted by land road transportation. Therefore, generally speaking, the single-unit capacity of offshore wind farms is higher than that of onshore wind farms. Offshore wind power avoids the land use issues of onshore wind power. On the one hand, onshore land is expensive and land resources are limited; on the other hand, onshore development is not suitable for wind farm development due to factors such as landscape and noise. Developing wind farms in offshore areas has the advantages of lower land costs and no impact on the visual landscape.

[0003] Currently, offshore wind turbine platforms often face extreme weather conditions such as strong winds, high waves, and heavy fog, which can cause severe shaking and unstable navigation of maintenance vessels, increasing the risk of boarding personnel. For example, during strong winds, wind speeds can reach over 12, making it easy for maintenance vessels to lose control and forcing the suspension of boarding operations. Most maintenance vessels are converted fishing boats or small workboats with limited docking capacity, making it difficult for retractable boarding platforms to maintain contact with the offshore wind turbine platform. Consequently, personnel often fall into the sea during boarding. Consequently, existing offshore maintenance vessels are unable to ensure safe boarding of personnel to offshore wind turbine platforms. Summary of the Invention

[0004] Purpose of the invention: The purpose of the present invention is to solve the deficiencies in the prior art and provide a constant thrust closed servo control loop.

[0005] Technical solution: A constant thrust closed servo control loop, including an oil tank, hydraulic cylinder 1 and hydraulic cylinder 2, the oil tank is connected to oil suction filter 1 and oil suction filter 2, oil suction filter 1 is connected to one-way valve 1, oil suction filter 2 is connected to one-way valve 2, a two-way hydraulic pump is arranged between one-way valve 1 and one-way valve 2, one-way valve 1 is connected to overflow valve 1 and one-way valve 3, overflow valve 1 is set to a first overflow pressure value, one-way valve 3 is connected to a two-position two-way electromagnetic reversing valve 1, the upper interface of hydraulic cylinder 1 and hydraulic cylinder 2 is connected to one-way valve 3, one-way valve 2 is connected to overflow valve 2 and one-way valve 4, overflow valve 2 is set to a second overflow pressure value, one-way valve 4 is connected to a two-position two-way electromagnetic reversing valve 2, and the lower interface of hydraulic cylinder 1 and hydraulic cylinder 2 is connected to one-way valve 4.

[0006] A further improvement of the present invention is that when the overflow valve 2 has not reached the second overflow pressure value, the two-position two-way solenoid reversing valve 2 is in a power-off state, and the two-position two-way solenoid reversing valve 1 is in a power-on state. The hydraulic oil sucked from the oil tank by the oil suction filter 1 passes through the one-way valve 1 to make the two-way hydraulic pump rotate forward, the hydraulic oil flows through the one-way valve 4 and drives the hydraulic cylinder 1 and the hydraulic cylinder 2 to extend outward, and the hydraulic oil in the piston rod chamber of the hydraulic cylinder 1 and the hydraulic cylinder 2 flows through the two-position two-way solenoid reversing valve 1 to the oil tank, forming a closed loop.

[0007] A further improvement of the present invention is that when the overflow valve 2 reaches the second overflow pressure value, the two-position two-way solenoid reversing valve 2 is in an energized state, and the two-position two-way solenoid reversing valve 1 is in an off-power state. The hydraulic oil sucked from the oil tank by the oil suction filter 2 passes through the one-way valve 2 to reverse the two-way hydraulic pump, and the hydraulic oil flows through the one-way valve 3 and drives the hydraulic cylinder 1 and the hydraulic cylinder 2 to retract inward. The hydraulic oil in the piston rod chamber of the hydraulic cylinder 1 and the hydraulic cylinder 2 flows through the two-position two-way solenoid reversing valve 2 to the oil tank.

[0008] A further improvement of the present invention is that the oil tank is equipped with a liquid level gauge.

[0009] A further improvement of the present invention is that when the overflow valve 1 does not reach the first overflow pressure value, the two-position two-way solenoid reversing valve 1 remains in the de-energized state, the two-position two-way solenoid reversing valve 2 remains in the energized state, and the hydraulic oil in the piston rod chamber of the hydraulic cylinder 1 and the hydraulic cylinder 2 flows through the two-position two-way solenoid reversing valve 2 to the oil tank.

[0010] A further improvement of the present invention is that the bidirectional hydraulic pump is equipped with a servo motor.

[0011] A further improvement of the present invention is that the fuel tank is equipped with an air respirator.

[0012] A further improvement of the present invention is that the first overflow pressure value is 160 bar and the second overflow pressure value is 180 bar.

[0013] Compared with the prior art, the constant thrust closed servo control loop provided by the present invention achieves at least the following beneficial effects: The present invention converts the rotational motion of the bidirectional hydraulic pump into the linear telescopic motion of the oil cylinder, and controls the on-off of the solenoid valve by the pressure value of the relief valve, so that the thrust of the oil cylinder remains constant. During the telescopic motion, no matter how the speed, load, or friction changes, the thrust output to the load always remains constant. The telescopic boarding platform generates a constant thrust to keep it in contact with the offshore wind power platform. The telescopic platform always expands and contracts with the waves, allowing boarding personnel to safely board the offshore wind power platform, so that the offshore operation and maintenance vessel can quickly and safely transport personnel. The present invention has a compact structure, realizes constant thrust output, and the formed closed loop can realize energy recovery and utilization. It has high power density, large thrust, and stable operation, so as to realize safe boarding of boarding personnel. It is suitable for various sea conditions, and the bidirectional hydraulic pump is driven by a servo motor to make the hydraulic cylinder reverse, thereby reducing energy consumption and having the advantages of fast response speed, strong power, and low noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a structural schematic diagram of a constant thrust closed servo control loop of the present invention.

[0015] Figure markings: 1-oil tank, 2-liquid level gauge, 3-air respirator, 41-oil suction filter 1, 42-oil suction filter 2, 5-servo motor, 6-bidirectional hydraulic pump, 71-overflow valve 1, 72-overflow valve 2, 81-check valve 1, 82-check valve 2, 91-check valve 3, 92-check valve 4, 101-two-position two-way solenoid reversing valve 1, 102-two-position two-way solenoid reversing valve 2, 111-hydraulic cylinder 1, 112-hydraulic cylinder 2. DETAILED DESCRIPTION

[0016] Various exemplary embodiments of the present invention will now be described in detail. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions, and values ​​set forth in these embodiments do not limit the scope of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0017] Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0018] See Figure 1A constant thrust closed servo control circuit includes an oil tank 1, a hydraulic cylinder 111 and a hydraulic cylinder 2 112. The oil tank 1 is connected to an oil suction filter 1 41 and an oil suction filter 2 42. The oil suction filter 1 41 is connected to a one-way valve 1 81. The oil suction filter 2 42 is connected to a one-way valve 2 82. A bidirectional hydraulic pump 6 is provided between the one-way valve 1 81 and the one-way valve 2 82. The one-way valve 1 81 is connected to a relief valve 1 71 and a one-way valve 3 91. The relief valve 1 71 A first overflow pressure value is set, one-way valve three 91 is connected to two-position two-way electromagnetic reversing valve one 101, the upper interfaces of hydraulic cylinder one 111 and hydraulic cylinder two 112 are connected to one-way valve three 91, one-way valve two 82 is connected to overflow valve two 72 and one-way valve four 92, overflow valve two 72 is set to a second overflow pressure value, one-way valve four 92 is connected to two-position two-way electromagnetic reversing valve two 102, and the lower interfaces of hydraulic cylinder one 111 and hydraulic cylinder two 112 are connected to one-way valve four 92.

[0019] A further improvement of the present invention is that when the overflow valve 2 72 has not reached the second overflow pressure value, the two-position two-way solenoid reversing valve 2 102 is in a power-off state, and the two-position two-way solenoid reversing valve 1 101 is in a power-on state. The hydraulic oil sucked from the oil tank 1 by the oil suction filter 1 41 passes through the one-way valve 1 81 to make the two-way hydraulic pump 6 rotate forward, and the hydraulic oil flows through the one-way valve 4 92 and drives the hydraulic cylinder 1 111 and the hydraulic cylinder 2 112 to extend outward. The hydraulic oil in the piston rod chamber of the hydraulic cylinder 111 and the hydraulic cylinder 2 112 flows through the two-position two-way solenoid reversing valve 1 101 to the oil tank 1, forming a closed loop.

[0020] A further improvement of the present invention is that when the overflow valve 2 72 reaches the second overflow pressure value, the two-position two-way solenoid reversing valve 2 102 is in an energized state, and the two-position two-way solenoid reversing valve 1 101 is in an off-power state. The hydraulic oil sucked from the oil tank 1 by the oil suction filter 2 42 passes through the one-way valve 2 82 to reverse the two-way hydraulic pump 6. The hydraulic oil flows through the one-way valve 3 91 and drives the hydraulic cylinder 1 111 and the hydraulic cylinder 2 112 to retract inward. The hydraulic oil in the piston rod chamber of the hydraulic cylinder 111 and the hydraulic cylinder 2 112 flows through the two-position two-way solenoid reversing valve 2 102 to the oil tank 1.

[0021] A further improvement of the present invention is that the oil tank 1 is equipped with a liquid level meter 2, which can monitor the dynamics of the oil tank inventory.

[0022] A further improvement of the present invention is that when the overflow valve 71 does not reach the first overflow pressure value, the two-position two-way solenoid reversing valve 101 remains in the de-energized state, and the two-position two-way solenoid reversing valve 2 102 remains in the energized state, and the hydraulic oil in the piston rod chamber of the hydraulic cylinder 111 and the hydraulic cylinder 2 112 flows through the two-position two-way solenoid reversing valve 2 102 to the oil tank 1.

[0023] A further improvement of the present invention is that the bidirectional hydraulic pump 6 is equipped with a servo motor 5, which dynamically adjusts the speed according to the load demand, avoids overflow loss in the pressure holding stage of the traditional hydraulic system, quickly responds to system pressure changes, and improves control accuracy.

[0024] A further improvement of the present invention is that the fuel tank 1 is equipped with an air respirator 3, which balances the air pressure inside and outside the fuel tank to prevent deformation or leakage of the fuel tank due to pressure difference.

[0025] A further improvement of the present invention is that the first overflow pressure value is 160 bar and the second overflow pressure value is 180 bar.

[0026] In summary, the present invention controls the on-off of the solenoid valve through the pressure value of the overflow valve, so that the thrust of the oil cylinder remains constant. During the telescopic movement, no matter how the speed, load, or friction changes, the thrust output to the load always remains constant. The telescopic boarding platform generates a constant thrust to keep it in contact with the offshore wind power platform. The telescopic platform always expands and contracts with the waves, allowing boarding personnel to safely board the offshore wind power platform, enabling the offshore operation and maintenance vessel to transport personnel quickly and safely. The structure is compact, and constant thrust output is achieved. The closed loop formed can realize energy recovery and utilization. It has the advantages of high power density, large thrust, and smooth operation, and can achieve safe boarding of boarding personnel. It is suitable for various sea conditions.

[0027] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A constant thrust closed servo control loop, characterized by: The invention comprises an oil tank (1), a hydraulic cylinder 1 (111) and a hydraulic cylinder 2 (112), wherein the oil tank (1) is connected to an oil suction filter 1 (41) and an oil suction filter 2 (42), wherein the oil suction filter 1 (41) is connected to a one-way valve 1 (81), wherein the oil suction filter 2 (42) is connected to a one-way valve 2 (82), wherein a bidirectional hydraulic pump (6) is provided between the one-way valve 1 (81) and the one-way valve 2 (82), wherein the one-way valve 1 (81) is connected to an overflow valve 1 (71) and a one-way valve 3 (91), wherein the overflow valve 1 (71) is provided with a first Overflow pressure value, the one-way valve three (91) is connected to the two-position two-way electromagnetic reversing valve one (101), the upper interfaces of the hydraulic cylinder one (111) and the hydraulic cylinder two (112) are connected to the one-way valve three (91), the one-way valve two (82) is connected to the overflow valve two (72) and the one-way valve four (92), the overflow valve two (72) is set to a second overflow pressure value, the one-way valve four (92) is connected to the two-position two-way electromagnetic reversing valve two (102), and the lower interfaces of the hydraulic cylinder one (111) and the hydraulic cylinder two (112) are connected to the one-way valve four (92).

2. A constant thrust closed servo control loop according to claim 1, characterized in that: When the overflow valve 2 (72) does not reach the second overflow pressure value, the two-position two-way electromagnetic reversing valve 2 (102) is in a power-off state, and the two-position two-way electromagnetic reversing valve 1 (101) is in a power-on state. The hydraulic oil sucked from the oil tank (1) by the oil suction filter 1 (41) passes through the one-way valve 1 (81) to make the two-way hydraulic pump (6) rotate forward, and the hydraulic oil flows through the one-way valve 4 (92) and drives the hydraulic cylinder 1 (111) and the hydraulic cylinder 2 (112) to extend outward. The hydraulic oil in the piston rod chamber of the hydraulic cylinder 1 (111) and the hydraulic cylinder 2 (112) flows through the two-position two-way electromagnetic reversing valve 1 (101) to the oil tank (1), forming a closed circuit.

3. The constant thrust closed servo control loop according to claim 1, characterized in that: When the overflow valve 2 (72) reaches the second overflow pressure value, the two-position two-way electromagnetic reversing valve 2 (102) is in an energized state, the two-position two-way electromagnetic reversing valve 1 (101) is in an off-power state, the hydraulic oil sucked from the oil tank (1) by the oil suction filter 2 (42) passes through the one-way valve 2 (82) to reverse the two-way hydraulic pump (6), the hydraulic oil flows through the one-way valve 3 (91) and drives the hydraulic cylinder 1 (111) and the hydraulic cylinder 2 (112) to retract inward, and the hydraulic oil in the piston rod chamber of the hydraulic cylinder 1 (111) and the hydraulic cylinder 2 (112) flows through the two-position two-way electromagnetic reversing valve 2 (102) to the oil tank (1).

4. The constant thrust closed servo control loop according to claim 1, characterized in that: The oil tank (1) is equipped with a liquid level gauge (2).

5. The constant thrust closed servo control loop according to claim 3, characterized in that: When the overflow valve 1 (71) does not reach the first overflow pressure value, the two-position two-way electromagnetic reversing valve 1 (101) remains in a power-off state, the two-position two-way electromagnetic reversing valve 2 (102) remains in a power-on state, and the hydraulic oil in the piston rod chambers of the hydraulic cylinder 1 (111) and the hydraulic cylinder 2 (112) flows through the two-position two-way electromagnetic reversing valve 2 (102) to the oil tank (1).

6. The constant thrust closed servo control loop according to claim 1, characterized in that: The bidirectional hydraulic pump (6) is equipped with a servo motor (5).

7. The constant thrust closed servo control loop according to claim 1, characterized in that: The oil tank (1) is equipped with an air respirator (3).

8. A constant thrust closed servo control loop according to any one of claims 1 to 7, characterized in that: The first overflow pressure value is 160 bar, and the second overflow pressure value is 180 bar.

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