A wave energy storage power generation system based on mechanical-hydraulic coupling transmission

Abstract

The present invention belongs to the field of marine new energy technology, and relates to a marine wave energy power generation device. The system includes an energy capture device, a mechanical transmission device and a hydraulic transmission device, wherein the energy capture device is used to capture wave energy, the mechanical transmission device is connected to the energy capture device, and is used to convert wave energy into mechanical energy, the hydraulic transmission device is connected to the mechanical transmission device, and is used to convert mechanical energy into hydraulic energy; the hydraulic transmission device is connected to the power generation system. The wave energy storage power generation system based on mechanical-hydraulic coupling transmission of the present invention has the beneficial effect that the mechanical-hydraulic coupling transmission mode is adopted, which can not only adapt to complex and changeable sea conditions, ensure the reliable operation of the float and capture wave energy to the maximum extent, but also realize continuous, stable and controllable energy output. The hydraulic transmission system realizes the coordinated and orderly operation of multiple groups of accumulators by controlling multiple groups of accumulators, which can improve the utilization rate of wave energy and reduce the waste of wave energy.

Description

Technical Field

[0001] The invention belongs to the technical field of marine new energy and relates to an ocean wave energy power generation device. Background Art

[0002] The close combination of island energy demonstration and deep-sea resource development is the development direction of my country's marine energy development technology. In recent years, my country's marine energy development has mainly focused on power generation. Generally speaking, there are many types of wave energy power generation devices in my country. Among them, the oscillating float type has the advantages of simple structure and relatively high energy conversion efficiency. It is more suitable for the characteristics of short wave period and relatively low energy density in my country's offshore sea conditions. The oscillating float wave energy device uses the float as a carrier to absorb wave energy. The float produces reciprocating motion under the action of wave energy, and then drives the power generation device to generate electricity through mechanical transmission or hydraulic transmission devices.

[0003] The existing mechanical transmission wave energy power generation device (CN201610262008, CN201711176186) adopts the form of chain transmission, and uses a flywheel at the output end of the sprocket to store energy and drive the generator to generate electricity. To a certain extent, it can output continuous energy, but because the flywheel output performance cannot be effectively controlled, the stability of power generation is greatly affected by the wave conditions. In addition, this type of chain drive generally passes through the inside of the float, so there will be space in the middle of the float, which makes the float's ability to capture wave energy not fully utilized (CN201610262008); and the square hole or other special-shaped holes opened in the middle of the float are easy to form stress concentration points under the action of wave force loads, thereby causing damage to the float (CN201711176186).

[0004] Existing hydraulic transmission wave energy power generation systems mostly use hydraulic cylinders as actuators. The hydraulic oil pressure discharged by the hydraulic cylinder driven by the float under the action of waves is low, so it is necessary to use a supercharger to increase the pressure before providing high-pressure oil to the hydraulic system, which increases the difficulty of application. In addition, the use of hydraulic cylinders as actuators is suitable for sea conditions with low wave heights. If the wave height is high, the movement of the float is limited by the length of the hydraulic cylinder, so it cannot adapt to the complex and changeable sea conditions in deep sea areas. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of poor controllability, inability to adapt to complex sea conditions, insufficient wave energy utilization, etc. of existing wave energy power generation devices, and to provide a wave energy storage power generation system based on mechanical-hydraulic coupling transmission and its control method. The present invention can not only adapt to complex and changeable sea conditions, ensure the reliable operation of the float while maximizing the capture of wave energy, but also achieve continuous, stable and controllable energy output.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a wave energy storage power generation system based on mechanical-hydraulic coupling transmission, including an energy capture device, a mechanical transmission device and a hydraulic transmission device, the energy capture device is used to capture wave energy, the mechanical transmission device is connected to the energy capture device, and is used to convert wave energy into mechanical energy, the hydraulic transmission device is connected to the mechanical transmission device, and is used to convert mechanical energy into hydraulic energy; the hydraulic transmission device is connected to the power generation system.

[0007] As a preferred embodiment of the present invention, the energy capture device includes a float and a float guide mechanism, and the float guide mechanism includes a guide sleeve and a guide column for fixing the float; there are three groups of guide columns, which are evenly distributed around the float in the circumferential direction, and the float is fixed on the guide sleeve and moves up and down along the guide column.

[0008] Further preferably, a limiting device is provided on the guide column, and the limiting device is used to limit the movement stroke of the float.

[0009] As a preferred embodiment of the present invention, the mechanical transmission device includes a guide device and a transmission device; the guide device is connected to the support frame; the transmission device is fixed on the guide device and performs mechanical movement under the guidance of the guide device.

[0010] Further preferably, the guide device comprises a guide frame, a roller and a guide rail; the roller is fixed on the guide frame and rolls in the guide rail groove; the guide frame is connected to the support frame via a connecting block.

[0011] Further preferably, the upper portion of the connecting block is fixedly connected to the guide frame, and the lower portion is pin-connected to the support frame.

[0012] Further preferably, the transmission device is a chain transmission, a rack transmission or a belt transmission device.

[0013] As a preferred embodiment of the present invention, the hydraulic transmission device includes a speed increaser, a bidirectional hydraulic pump, an accumulator, and a hydraulic motor; the speed increaser is connected to the output shaft of the mechanical transmission device, and the bidirectional hydraulic pump is connected to the speed increaser, and oil is injected into the accumulator through double-stroke work; the accumulator outputs high-pressure oil to drive the hydraulic motor.

[0014] Further preferably, the hydraulic oil circuit is provided with a one-way valve, and the one-way valve is used to control the direction of the hydraulic oil, so that when the bidirectional hydraulic pump rotates forward and reverse, the hydraulic oil enters the hydraulic circuit through different oil circuits.

[0015] Further preferably, there are more than two groups of accumulators, and the more than two groups of accumulators are connected in parallel in the hydraulic circuit; a normally-open solenoid valve is provided in front of the accumulator, and a normally-off solenoid valve is provided in the rear; among the more than two groups of accumulators, at least one group of accumulators is filled with oil while the other accumulators are discharged.

[0016] The invention discloses a wave energy storage power generation system based on mechanical-hydraulic coupling transmission, which has the beneficial effects of: adopting the mechanical-hydraulic coupling transmission mode, it can not only adapt to complex and changeable sea conditions, ensure the reliable operation of the float and capture wave energy to the maximum extent, but also realize continuous, stable and controllable energy output. The hydraulic transmission system realizes the coordinated and orderly operation of multiple groups of accumulators by controlling multiple groups of accumulators, which can improve the utilization rate of wave energy and reduce the waste of wave energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of an energy capture device and a mechanical transmission device in an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of the guide device;

[0019] Figure 3 It is a structural schematic diagram of the guide frame;

[0020] Figure 4 is a rear side view of the guide frame;

[0021] Figure 5 Chain sprocket installation diagram;

[0022] Figure 6 Schematic diagram of hydraulic transmission. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0024] One of the embodiments provided by the present invention is: a wave energy storage power generation system based on mechanical-hydraulic coupling transmission, which is mainly composed of an energy capture device, a mechanical transmission device and a hydraulic transmission device. The wave energy is captured by the energy capture device and transmitted to the mechanical transmission device. The mechanical transmission device converts the wave energy into mechanical energy, and then transmits the mechanical energy to the hydraulic transmission device. The hydraulic transmission device converts the mechanical energy into stable hydraulic energy and outputs it to the power generation device for power generation.

[0025] like Figure 1As shown, the energy capture device includes a float 13 and a float guide mechanism, and uses the vertical oscillation of the float to capture wave energy. In order to limit the float 13 to only perform single-degree-of-freedom vertical swing motion, three guide tubes 9 are evenly distributed along the circumference of the float 13, and the guide column 12 passes through the guide tube 9, the upper end is connected to the main deck 8, and the lower end is connected to the base 11, so as to ensure that the float 13 can move up and down along the guide column 12, and at the same time eliminate the influence of waves on the overturning oscillation of the float 13, which is conducive to the collection and conversion of wave energy.

[0026] The upper and lower parts of the three guide pillars 12 are provided with buffer limit devices 10, which can limit the maximum stroke position of the up and down movement of the float 13, thereby ensuring the safe and reliable operation of the system.

[0027] like Figure 1 As shown, the mechanical transmission device is mainly composed of a support frame 14, a guide device, a chain transmission device, a tensioning device, etc. The chain transmission device is located above the float 13, avoiding the stress concentration problem caused by opening a hole on the float 13, and ensuring that the float can capture wave energy to the maximum extent.

[0028] The function of the support frame 14 is to transmit the movement of the float 13 to the chain transmission device. The bottom of the support frame 14 is fixedly installed on the float 13, and a through hole is opened on the main deck 8. The upper part of the support frame 14 extends out from the through hole and is connected to the guide frame 15 through a connecting block 18.

[0029] like Figure 2 As shown, the guide device composed of the guide frame 15, rollers 19 and guide rails 5 mainly guides the support frame 14. The guide rails 5 are installed between the console 3 and the main deck 8. Four rollers 19 are installed on both sides of the guide frame 15. The rollers 19 are placed in the grooves of the guide rails 5 to ensure that the support frame 14 moves up and down along the direction of the guide rails 5.

[0030] like Figure 3 and 4 As shown, the guide frame 15 is mainly composed of an outer roller mounting frame 15-1, an inner roller mounting frame 15-2, a chain mounting square tube 15-3, a connecting square tube 15-4, and a connecting rib 15-5. The roller 19 is fixedly mounted on the outer roller mounting frame 15-1 and the inner roller mounting frame 15-2 by bolts, and can roll along the guide rail 5. The outer roller mounting frame 15-1 and the inner roller mounting frame 15-2 are welded together by the connecting square tube 15-4. The chain mounting square tube 15-3 is welded to one side of the two inner roller mounting frames 15-2, and can be fixedly mounted with the chain 16 by bolts. The connecting block 18 is connected to the inner roller mounting frame 15-2 through the connecting rib 15-5 welded on the inner roller mounting frame 15-2.

[0031] Ideally, the float 13 moves vertically relative to the main deck under the action of wave force. However, due to the installation gap between the float 13 and the guide column, the float 13 will shake left and right while moving up and down, which will undoubtedly affect the meshing of the sprocket and the chain. In order to eliminate the influence of the gap on the chain 16, a horizontal through hole is opened on the connecting block 18, and the support frame 14 and the connecting block 18 are connected by a pin 17. The connecting block 18 can only move vertically relative to the guide frame 15 and the guide rail 5. Therefore, when the float 13 swings and tilts, the pin 17 moves left and right or forward and backward in the through hole of the connecting block 18, thereby eliminating the influence of the gap on the chain. Figure 2 shown.

[0032] like Figure 1 and 5 As shown, the chain transmission device includes sprocket I 1, sprocket II 6 and chain 16. The function of the sprocket and chain is to convert the linear motion of the support frame 14 into rotational motion. Sprocket I 1 is installed on the console 3 through sprocket I support 2, and sprocket II 6 is installed on the main deck 8 through sprocket II support 7. Sprocket I 1 and sprocket II 6 are arranged vertically, and chain 16 forms a vertical transmission between sprocket I 1 and sprocket II 6. The center distance between sprocket I 1 and sprocket II 6 can be adjusted to adapt to different sea conditions. Chain 16 is connected to guide frame 15 through chain plate 21. At the same time, in order to adapt to the error generated during the installation process, a spacer plate 20 is installed between guide frame 15 and chain 16 to adjust the gap generated during the installation process. The sprocket shaft 23 of sprocket II 6 is installed in conjunction with the bearing seat 22, and the bearing seat 22 is installed on the sprocket II support 7.

[0033] The function of the tensioning device 4 is to ensure the effective engagement of the chain. The tensioning device 4 is installed on the guide rail crossbeam, and through the gravity tensioning mode, a weight is hung on one side to press the tensioning wheel on the other side onto the chain 16 to achieve tensioning.

[0034] It should be noted that the chain transmission device in this embodiment can also be replaced by a rack transmission device or a belt transmission device, and its function and effect achieved are the same as those of the chain transmission device in this embodiment.

[0035] During operation, the float 13 drives the support frame 14 to move up and down under the action of wave force. The support frame 14 acts on the guide frame 15 through the connecting block 18, and drives the roller 19 to roll along the guide rail 5, so that the support frame 14 drives the chain 16 to make a linear motion along the guide rail direction. The chain 16 drives the sprocket I1 and the sprocket II6 to rotate through meshing action, thereby realizing the conversion of wave energy into mechanical energy.

[0036] Since the mechanical energy output by the mechanical transmission device is affected by waves and has poor continuity and stability, this embodiment uses a hydraulic system to convert the mechanical energy output by the mechanical transmission device into hydraulic energy to achieve continuous and stable power generation.

[0037] like Figure 6 As shown, the hydraulic transmission device mainly includes a speed increaser, a bidirectional hydraulic pump 24, an accumulator 27, and a hydraulic motor 32. The speed increaser is connected to the sprocket I1 output shaft of the mechanical transmission device. The speed output by the sprocket I1 output shaft drives the bidirectional hydraulic pump 24 to work after being increased by the speed increaser. The bidirectional hydraulic pump 24 can rotate forward and reverse, thereby realizing double-stroke work during the up and down movement of the float. The hydraulic pump 24 sucks oil from the oil tank 35 and pumps the oil into the accumulator 27, and the accumulator 27 outputs high-pressure oil. The accumulator 27 is controlled by setting a control strategy to complete the oil charging and discharging action, and then drives the hydraulic motor 32 to drive the generator 33 to complete the power output.

[0038] Five one-way valves are provided on the hydraulic oil circuit to realize the one-way property of the hydraulic oil circuit. When the two-way hydraulic pump 24 rotates counterclockwise, the hydraulic oil in the oil tank 35 is sucked into the hydraulic pump through the fourth one-way valve 25-4, and the oil is discharged from the two-way hydraulic pump 24 through the first one-way valve 25-1 into the hydraulic circuit; conversely, when the two-way hydraulic pump 24 rotates clockwise, the hydraulic oil in the oil tank 35 is sucked into the hydraulic pump through the third one-way valve 25-3, and the oil is discharged from the two-way hydraulic pump 24 through the second one-way valve 25-2 into the hydraulic circuit, flows through the accumulator 27, the hydraulic motor 32 and the fifth one-way valve 25-5, and finally flows back to the oil tank 35.

[0039] Hydraulic energy storage can enable the float to output stable hydraulic energy under different wave conditions. In this embodiment, the hydraulic system can be effectively controlled by using a solenoid valve and a pressure relay.

[0040] In the hydraulic circuit, in front of the accumulator 27 is a two-position two-way normally open solenoid valve (hereinafter referred to as the normally open valve) 26, the oil inlet side is connected to the two-way hydraulic pump 24, and the normally open end of the oil outlet side is connected to the accumulator 27. The solenoid valve behind the accumulator 27 is a two-position two-way normally closed solenoid valve (hereinafter referred to as the normally closed valve) 28, and the oil outlet side is connected to the hydraulic motor 32, that is, after the normally closed valve 28 is energized, a passage is formed between the accumulator 27 and the hydraulic motor 32. The first pressure relay 30-1 and the second pressure relay 30-2 are used to set the initial pressure and release pressure of the accumulator 27, respectively, and control the working state of the solenoid valve. The pressure condition of the system can be monitored in real time through the pressure gauge 29.

[0041] When working, a single accumulator can only perform one action, filling or draining oil, but not both at the same time. In fact, when the accumulator drains oil, the float does not stop oscillating. At this time, the hydraulic oil discharged by the hydraulic pump flows back to the oil tank because it cannot be filled into the accumulator, which causes a waste of wave energy. Therefore, in order to ensure that when the accumulator releases hydraulic oil to drive the generator to work, the wave energy absorbed by the front end is still fully utilized, this embodiment adopts multiple groups of accumulators, and controls the working mode of the accumulator through a certain control strategy, so that they work together to ensure that one part of the accumulator is draining oil while another part of the accumulator is filling oil.

[0042] This embodiment takes three groups of accumulators as an example, and the specific control method is as follows:

[0043] 1 / 3 working cycle: When the pressure of the pressure gauge 29 is less than the set value of the first pressure relay 30-1, the first normally-open valve 26-1, the second normally-open valve 26-2 and the normally-closed valves (28-1, 28-2, 28-3) are de-energized, and the third normally-open valve 26-3 is energized. At this time, the first accumulator 27-1 and the second accumulator 27-2 are in the oil-filled state, and the third accumulator 27-3 does not work. When the pressure of the pressure gauge 29 reaches the set value of the second pressure relay 30-2 for the first time, the first 26-1, the second normally-open valve 26-2 and the first normally-closed valve 28-1, the second normally-closed valve 28-2 are energized, and the third normally-open valve 26-3 and the third normally-closed valve 28-3 are de-energized. At this time, the first accumulator 27-1 and the second accumulator 27-2 are in the oil-draining state, and the third accumulator 27-3 is in the oil-filled state. The hydraulic oil released from the first accumulator 27 - 1 and the second accumulator 27 - 2 flows into the hydraulic motor 32 after being regulated by the speed regulating valve 31 . The rotation of the hydraulic motor 32 drives the generator 33 to work, thereby realizing the output of electric energy.

[0044] The 2nd / 3rd working cycle: when the pressure of the pressure gauge 29 drops to the set value of the first pressure relay 30-1, the first normally open valve 26-1 and the first normally closed valve 28-1 and the second normally closed valve 28-2 are switched to off-power, the second normally open valve 26-2 remains energized, the third normally open valve 26-3 and the third normally closed valve 28-3 remain off-power, at this time, the first accumulator 27-1 and the third accumulator 27-3 are in the oil-filled state, and the second accumulator 27-2 does not work. When the pressure of the pressure gauge 29 rises to the set value of the second pressure relay 30-2 again, the first normally open valve 26-1, the third normally open valve 26-3 and the first normally closed valve 28-1 and the third normally closed valve 28-3 are energized, the second normally open valve 26-2 and the second normally closed valve 28-2 are off-powered, at this time, the first accumulator 27-1 and the third accumulator 27-3 are in the oil-draining state, and the second accumulator 27-2 is in the oil-filled state.

[0045] 3 / 3 working cycle: when the pressure drops to the setting value of the first pressure relay 30-1 again, the third normally-open valve 26-3 and the first normally-closed valve 28-1 and the third normally-closed valve 28-3 are switched to off-power, the first normally-open valve 26-1 remains energized, the second normally-open valve 26-2 and the second normally-closed valve 28-2 remain off-powered, at this time, the second accumulator 27-2 and the third accumulator 27-3 are in the oil-filled state, and the first accumulator 27-1 does not work. When the pressure of the pressure gauge 29 reaches the setting value of the first pressure relay 30-1 for the third time, the second normally-open valve 26-2, the third normally-open valve 26-3 and the second normally-closed valve 28-2 and the third normally-closed valve 28-3 are energized, the first normally-open valve 26-1 and the first normally-closed valve 28-1 are off-powered, at this time the second accumulator 27-2 and the third accumulator 27-3 are in the oil-draining state, and the first accumulator 27-1 is in the oil-filled state. When the pressure drops to the set value of the first pressure relay 30-1 again, the system re-enters the 1 / 3 working cycle and starts the next energy storage and power generation cycle, as shown in Table 1.

[0046] Table 1 corresponds to the working status of valves and accumulators at different stages in a cycle

[0047]

[0048] Note: О: represents the solenoid valve is energized; ×: represents the solenoid valve is de-energized; -: represents the accumulator is not working.

[0049] By adopting the above control method, one group of accumulators can be filled with oil while two groups of accumulators are being discharged. At the same time, the capacity of the accumulators should be reasonably calculated to ensure that when the two groups of accumulators are discharged, the other group of accumulators is not full. In this way, it can be ensured that there is always at least one group of accumulators in the system that is being filled with oil, thereby achieving full utilization of wave energy.

[0050] On the other hand, the control of the hydraulic system by the solenoid valve and pressure relay makes the power generation process of the generator only related to the initial value and release value set by the accumulator, and will not be affected by the wave conditions. Therefore, the purpose of stable power generation of the power generation system under different wave conditions can be achieved.

Claims

1. A wave energy storage power generation system based on mechanical-hydraulic coupling transmission, characterized in that: It comprises an energy capture device, a mechanical transmission device and a hydraulic transmission device, wherein the energy capture device is used to capture wave energy, the mechanical transmission device is connected to the energy capture device and is used to convert wave energy into mechanical energy, and the hydraulic transmission device is connected to the mechanical transmission device and is used to convert mechanical energy into hydraulic energy; the hydraulic transmission device is connected to a power generation system; the hydraulic transmission system comprises a speed increaser, a two-way hydraulic pump, an accumulator and a hydraulic motor; the speed increaser is connected to the mechanical transmission device, the two-way hydraulic pump is connected to the speed increaser, and oil is injected into the accumulator through double-stroke work; the accumulator outputs high-pressure oil to drive the hydraulic motor; the accumulator has three groups, and the three groups of accumulators are connected in parallel in a hydraulic circuit; a normally-on solenoid valve is provided in front of the accumulator, and a normally-off solenoid valve is provided in the rear; , at least one group of accumulators is charged with oil while the other accumulators are discharged; specifically: 1 / 3 working cycle: when the pressure of the pressure gauge is less than the setting value of the first pressure relay, the first normally-open valve, the second normally-open valve and the first normally-off valve, the second normally-off valve and the third normally-off valve are powered off, and the third normally-open valve is powered on. At this time, the first accumulator and the second accumulator are in an oil-charging state, and the third accumulator does not work; when the pressure of the pressure gauge reaches the setting value of the second pressure relay for the first time, the first and second normally-open valves and the first normally-off valve and the second normally-off valve are powered on, and the third normally-open valve and the third normally-off valve are powered off; at this time, the first accumulator and the second accumulator are in an oil-draining state, and the third accumulator is in an oil-charging state; the hydraulic oil released by the first accumulator and the second accumulator flows into the hydraulic motor after being regulated by the speed regulating valve, and the rotation of the hydraulic motor drives the generator to work, thereby realizing the output of electrical energy; 2nd / 3rd working cycle: when the pressure of the pressure gauge drops to the setting value of the first pressure relay, the first normally-open valve and the first normally-off valve and the second normally-off valve are switched to off-power, the second normally-open valve remains energized, and the third normally-open valve and the third normally-off valve remain off-powered. At this time, the first accumulator and the third accumulator are in the oil-filled state, and the second accumulator does not work; when the pressure of the pressure gauge rises to the setting value of the second pressure relay again, the first normally-open valve, the third normally-open valve and the first normally-off valve and the third normally-off valve are energized, and the second normally-open valve and the second normally-off valve are off-powered. At this time, the first accumulator and the third accumulator are in the oil-draining state, and the second accumulator is in the oil-filled state; 3 / 3 working cycle: when the pressure drops to the setting value of the first pressure relay again, the third normally-open valve and the first normally-off valve and the third normally-off valve are switched to off-power, the first normally-open valve remains energized, and the second normally-open valve and the second normally-off valve remain off-powered. At this time, the second accumulator and the third accumulator are in the oil-filled state, and the first accumulator does not work; when the pressure of the pressure gauge reaches the setting value of the first pressure relay for the third time, the second normally-open valve, the third normally-open valve, the second normally-off valve and the third normally-off valve are energized, and the first normally-open valve and the first normally-off valve are off-powered. At this time, the second accumulator and the third accumulator are in the oil-draining state, and the first accumulator is in the oil-filled state; when the pressure drops to the setting value of the first pressure relay again, the system re-enters the 1 / 3 working cycle and starts the next energy storage and power generation cycle.

2. The wave energy storage power generation system based on mechanical-hydraulic coupling transmission according to claim 1 is characterized in that: The energy capture device includes a float, a support frame, and a float guide mechanism. The support frame is fixed on the float and moves up and down with the float; the float guide mechanism includes a guide sleeve and a guide column for fixing the float; there are three groups of guide columns, which are evenly distributed around the float in the circumferential direction; the float is fixed on the guide sleeve and moves up and down along the guide column.

3. The wave energy storage power generation system based on mechanical-hydraulic coupling transmission according to claim 2 is characterized in that: The guide column is provided with a limit device, and the limit device is used to limit the movement stroke of the float.

4. The wave energy storage power generation system based on mechanical-hydraulic coupling transmission according to claim 3 is characterized in that: The mechanical transmission device comprises a guide device and a transmission device; the guide device is connected to the support frame; the transmission device is fixed on the guide device and performs mechanical movement under the guidance of the guide device.

5. The wave energy storage power generation system based on mechanical-hydraulic coupling transmission according to claim 4 is characterized in that: The guide device comprises a guide frame, a roller and a guide rail; the roller is fixed on the guide frame and rolls in the guide rail groove; the guide frame is connected to the support frame through a connecting block.

6. The wave energy storage power generation system based on mechanical-hydraulic coupling transmission according to claim 5 is characterized in that: The upper part of the connecting block is fixedly connected to the guide frame, and the lower part is connected to the support frame pin.

7. The wave energy storage power generation system based on mechanical-hydraulic coupling transmission according to claim 4, 5 or 6, characterized in that: The transmission device is a chain transmission, a rack transmission or a belt transmission device.

8. The wave energy storage power generation system based on mechanical-hydraulic coupling transmission according to claim 1 is characterized in that: The hydraulic oil circuit is provided with a one-way valve, which is used to control the direction of the hydraulic oil so that when the bidirectional hydraulic pump rotates forward and reverse, the hydraulic oil enters the hydraulic circuit through different oil circuits.

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