CN118705106A - Double buoy wave energy conversion device - Google Patents

Abstract

The invention discloses a double-floater wave energy conversion device, which relates to the field of clean energy utilization and comprises a floater connecting rod retainer with two end faces communicated, wherein a floater connecting rod is arranged in the floater connecting rod retainer, a first floater and a second floater which extend downwards are arranged on the floater connecting rod, the first floater and the second floater are respectively positioned on two sides of the floater connecting rod retainer, a connecting seat is arranged on one side of the upper end of the floater connecting rod, the connecting seat is rotationally connected with a transmission rack, the transmission rack is meshed with a gear set, the gear set is arranged on a mounting seat, the mounting seat is fixedly arranged on the floater connecting rod retainer, and the first floater and the second floater alternately undulate under the wave action to drive the transmission rack to do linear reciprocating motion relative to the gear set, and the linear reciprocating motion of the transmission rack is converted into unidirectional periodic rotary motion through the gear set. The double floats are connected with the float connecting rod to realize the wave steep self-adapting function, so that the double floats can efficiently generate electric energy under different wave steep conditions.

Description

Double buoy wave energy conversion device

Technical Field

The invention relates to the field of clean energy utilization, and in particular to a double-buoy wave energy conversion device.

Background Art

Wave energy power generation devices generally consist of three levels of energy conversion links. The first level, namely the wave energy capture link, uses compressed air in a closed space to convert wave energy into pneumatic energy, or uses wave aggregation to convert wave energy into water potential energy, or uses the heave or swaying motion of an object to convert wave energy into hydraulic energy or mechanical energy, corresponding to the oscillating water column type, wave-crossing type and oscillating body type, among which the oscillating body type includes the oscillating float type (point absorption type), pendulum type, duck type and raft type. The second level, also known as the intermediate conversion link, includes air turbines, water turbines, hydraulic systems, mechanical transmission systems, etc., which are responsible for converting the pneumatic energy, water potential energy, hydraulic energy, mechanical energy, etc. obtained in the wave energy capture link into energy forms that match the power generation system. The third level, namely the power generation link, generally uses a rotating generator; using a new type of motor, such as a linear generator or a magnetohydrodynamic generator, the capture system can directly drive the motor without a complex intermediate conversion link.

There are two main problems with traditional wave energy conversion devices:

First, traditional wave receiving bodies are mostly single-floating wave receiving bodies, which are then transmitted through intermediate media and finally generated by motors. The conversion efficiency problem caused by the cumbersome intermediate steps is the main problem that needs to be solved at present.

Second, the energy absorption of a single buoy during a wave receiving process is limited. To make the wave receiving body absorb fully, the structural size needs to be increased, which will limit the overall movement range of the wave receiving body and increase the burden of the rear-end conversion device. The small size of the wave receiving body structure will result in insufficient absorption of wave energy.

Based on this, the present invention proposes a double-buoy wave energy conversion device.

Summary of the invention

The object of the present invention is to provide a double-buoy wave energy conversion device to solve the problems raised in the above background technology.

To achieve the above object, the technical solution adopted by the present invention is:

The double-buoy wave energy conversion device comprises a float connecting rod holder with two side end faces intersecting each other, a float connecting rod is arranged inside the float connecting rod holder, a float one and a float two extending downward are arranged on the float connecting rod, and the float one and the float two are respectively located on two sides of the float connecting rod holder, a connecting seat is installed on one side of the upper end of the float connecting rod, the connecting seat is rotatably connected with a transmission rack, the transmission rack is meshed with a gear set fixed on the float connecting rod holder, and the float one and the float two alternately rise and fall under the action of waves, driving the transmission rack to make a linear reciprocating motion relative to the gear set, and the linear reciprocating motion of the transmission rack is converted into a unidirectional periodic rotational motion through the gear set.

Preferably, two transverse guide grooves are arranged on the float connecting rod along its length direction, and float 1 and float 2 are respectively slidably assembled in the two transverse guide grooves, and limit spring 1 and limit spring 2 are respectively arranged at the ends of float 1 and float 2 which are away from each other.

Preferably, the front and rear end surfaces of the float connecting rod retainer are provided with through vertical guide grooves along the height direction thereof, and a fulcrum shaft is connected through the middle portion of the float connecting rod, and the fulcrum shaft is slidably assembled in the vertical guide groove.

Preferably, the gear set includes shaft 1 and shaft 2, and the outer circumferential surface of shaft 1 is sleeved with transmission pinion 1 and transmission gear 1 in sequence, wherein transmission gear 1 is fixedly sleeved on the outer circumferential surface of shaft 1, and transmission pinion 1 is movably sleeved on the outer circumferential surface of shaft 1, and transmission pinion 2 and transmission gear 2 are sleeved in sequence on the outer circumferential surface of shaft 2, wherein transmission gear 2 is fixedly sleeved on the outer circumferential surface of shaft 1, and transmission pinion 2 is movably sleeved on the outer circumferential surface of shaft 1, transmission gear 1 is meshed with transmission gear 2, transmission gear 1 is meshed with transmission rack, and transmission pinion 1 and transmission pinion 2 are meshed and connected via output shaft gear;

The transmission pinion gear 1 and the transmission pinion gear 2 are both provided with inner ratchets, the front ends of the shaft 1 and the shaft 2 are both provided with pawl end covers, and the pawl end covers are provided with pawls matching the inner ratchets.

The present invention also provides a wave energy power generation device, which includes the double-buoy wave energy conversion device as mentioned above, and also includes a linear electromagnetic generator, the output shaft of the linear electromagnetic generator is drivingly connected to the output end of the gear set.

Preferably, the wave energy power generation device proposed in the present invention further comprises a fixed floating platform, on which a plurality of sets of double-buoy wave energy conversion devices are installed.

Preferably, a streamlined guiding tail rudder is fixed to the tail of the fixed floating platform, and the streamlined guiding tail rudder is used to drive the fixed floating platform to always face the direction of the upstream surface.

Preferably, directional buoys are provided at both ends of the fixed floating platform along the vertical direction.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention improves the traditional single-buoy wave energy conversion device and adopts a double-buoy linear absorption method. Compared with the single-buoy point absorption method, the double-buoy can obtain a longer wave-receiving body movement stroke and improve the energy absorption efficiency under a certain spatial size.

(2) The present invention adopts a mechanical gear rack transmission method. After analyzing hydraulic transmission and pneumatic devices, it is found that compared with wave energy conversion devices that require an intermediate medium, mechanical transmission devices have higher energy transfer efficiency. Among traditional mechanical transmission devices, gear transmission is more efficient. While reducing the structural size, it has better structural stability and is more adaptable to the marine environment.

(3) The wave energy power generation device proposed in the present invention utilizes the guide tail rudder to keep the fixed floating platform always facing the direction of the water flow under the action of the water flow, so that the entire device is kept facing the flow surface, thereby obtaining the maximum inclination angle of the float connecting rod.

(4) The power generation device uses directional buoys set at both ends to support the floating of the entire device. At the same time, it has a certain stability and will not move violently under the action of waves, so as to ensure that the float connecting rod can have obvious relative movement with respect to the floating platform.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

FIG1 is a schematic diagram of the structure of the entire conversion device proposed in an embodiment of the present invention;

FIG2 is a schematic diagram of the structure of a gear set in an embodiment of the present invention;

FIG3 is a schematic structural diagram of a float connecting rod in an embodiment of the present invention;

FIG4 is a schematic structural diagram of a transmission pinion 1 in an embodiment of the present invention;

FIG5 is a schematic structural diagram of a pawl end cover in an embodiment of the present invention;

FIG6 is a schematic diagram of a conversion device installed on a fixed floating platform in an embodiment of the present invention;

FIG7 is a schematic diagram of the motion state of float 1 and float 2 in an embodiment of the present invention;

FIG8 is a schematic diagram of the motion state of the float connecting rod in an embodiment of the present invention;

FIG9 is a schematic diagram of the derivation of the overall motion process of the preset model in an embodiment of the present invention;

FIG10 is an angular velocity curve diagram of the large gear 1 in FIG9 ;

FIG11 is a curve diagram showing the variation of energy generated by the preset model in one cycle with the circular frequency;

FIG. 12 is a curve diagram showing the variation of the energy conversion efficiency of the preset model proposed in the embodiment with the circular frequency.

In the figure: 1. float connecting rod; 11. fulcrum shaft; 12. transverse guide groove; 2. float one; 21. limit spring one; 3. float two; 31. limit spring two; 4. connecting seat; 5. transmission rack; 51. limit claw; 6. gear set; 61. shaft one; 611. ratchet end cover; 612. ratchet; 62. shaft two; 63. transmission pinion one; 631. inner ratchet; 64. transmission pinion two; 65. output shaft gear; 66. transmission large gear one; 67. transmission large gear two; 7. mounting seat; 8. float connecting rod retainer; 9. vertical guide groove; 10. fixed floating platform; 101. directional buoy; 102. guide tail rudder.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

Please refer to Figures 1 to 6. This embodiment proposes a power generation device including a double-buoy wave energy conversion device, wherein the double-buoy wave energy conversion device includes a float connecting rod holder 8 with two end faces intersecting each other, a float connecting rod 1 is arranged inside the float connecting rod holder 8, and a float 1 and a float 2 3 extending downward are arranged on the float connecting rod 1, and the float 1 2 and the float 2 3 are respectively located on both sides of the float connecting rod holder 8, and a connecting seat 4 is installed on one side of the upper end of the float connecting rod 1, and the connecting seat 4 is rotatably connected to a transmission rack 5, and the transmission rack 5 is meshed and connected with a gear set 6, which is arranged on a mounting seat 7, and the mounting seat 7 is fixedly mounted on the float connecting rod holder 8. The float 1 2 and the float 2 3 alternately rise and fall under the action of waves, driving the transmission rack 5 to make a linear reciprocating motion relative to the gear set 6, and the linear reciprocating motion of the transmission rack 5 is converted into a unidirectional periodic rotation through the gear set 6. The power generation device also includes a linear electromagnetic generator (not shown in the figure), the output shaft of the linear electromagnetic generator is drivingly connected to the output end of the gear set 6, and the linear electromagnetic generator converts the unidirectional periodic rotation transmitted by the gear set 6 into a periodic current output.

By referring to the wave motion in the actual sea conditions, it is not difficult to find that the periodic sinusoidal motion law of the wave can realize the function of alternately lifting the floating body. The double-float structure design can realize linear wave energy absorption, thereby improving the energy conversion efficiency. For example, under the action of waves, float 1 2 is lifted first, doing work on the float connecting rod 1, and float 2 3 simultaneously works on the float connecting rod 1 under the action of its own counterweight, causing it to rotate clockwise, and transmits the motion to the gear set 6 through the transmission rack 5. In order to increase the output speed, the gear specification design in the gear set 6 is used to complete the first-stage speed change, and finally output several times the speed to the DC generator. In this embodiment, the output speed is twice.

On the basis of the above scheme, during the movement, under the action of the double floats, the float connecting rod 1 always moves in accordance with the free wave surface, and moves according to the tangent equation of the free wave surface. The movement process includes vertical movement and rotational movement. Therefore, in order to meet the requirements of wave steepness adaptation, the following two floating mechanisms are designed as a whole:

First, two transverse guide grooves 12 are arranged on the float connecting rod 1 along its length direction, and the float 1 2 and the float 2 3 are respectively slidably assembled in the two transverse guide grooves 12, and the ends of the float 1 2 and the float 2 3 that are far away from each other are respectively provided with a limit spring 1 21 and a limit spring 2 31, and the position of the float on the float connecting rod 1 is adjusted by adding springs at both ends of the float, so as to adjust the position of the buoyancy point under the action of waves. As shown in Figures 3 and 7, when the float 1 2 is lifted, by analyzing the force on the float, the force component along the rod direction acts on the limit spring 1 21 to compress the limit spring 1 21, and the connection point of the float connecting rod 1 moves up, increasing the force arm of the buoyancy action; at the same time, under the action of buoyancy, the force component along the rod causes the limit spring 2 31 to be stretched, and the float 2 3 moves up, reducing the force arm of the buoyancy action at the lower end; the same applies when the float 2 3 is lifted. Under the action of the floats at both ends, the float connecting rod 1 is smoother and adapts to the characteristics of wave work. At the same time, under the load of the transmission rack 5, it provides a larger rotational torque. By adjusting the load of the rear end gear group power generation device and the rod length, high-efficiency power generation can be achieved according to the movement law of the entire device.

Secondly, in order to adapt to the lifting movement of the floating connecting rod 1 as a whole relative to the fixed floating platform 10 under the action of waves, a guide rail is added so that the floating connecting rod 1 can float vertically in the guide rail, so that the connecting rod as a whole can fit on the wave surface for vertical and rotation. Specifically: the front and rear end surfaces of the floating connecting rod retainer 8 are provided with a through vertical guide groove 9 along its height direction, and the middle part of the floating connecting rod 1 is connected with a fulcrum shaft 11, which is slidably assembled in the vertical guide groove 9.

As shown in FIG3 , the length of the float connecting rod 1 in the model is preset to 1 m (the wavelength of common waves is mostly on the order of 10 m). The length of the float connecting rod 1 can well adapt to the law of tangent motion of the wave surface. At the same time, the node on the float connecting rod 1 that is hinged to the transmission rack 5 is 300 mm away from the rotation center of the float connecting rod 1. This distance can be adjusted according to actual conditions. The following derivation of the transmission uses this preset length.

In order to adapt to the characteristics of the collection movement of the float connecting rod 1, a corresponding gear set 6 is used to realize the function of converting the reciprocating linear motion transmitted by the transmission rack 5 into reciprocating rotation and then into unidirectional rotation, as follows:

First, in the process of rack and pinion meshing, the movement of the connection point (connection seat 4) between the transmission rack 5 and the float connecting rod 1 has rotation around the fulcrum and vertical movement with the fulcrum. The rotation of the rack around the gear can realize the involute motion trajectory of the connection point, and the meshing motion of the rack and pinion can realize the linear motion of the connection point along the transmission rack 5. Through the composite motion analysis, it can be found that the adopted gear and rack meshing relationship can realize the conversion of the motion at the connection point into gear rotation motion, in which the linear motion of the connection point along the transmission rack 5 is the effective power generation motion.

Secondly, the gear set 6 uses two pairs of large and small gears on the connecting shaft and the meshing of the output shaft gear to convert the reciprocating gear rotation into the unidirectional rotation of the output shaft, and the function is realized by the ratchet and pawl transmission principle. Specifically, the gear set 6 includes shaft 1 61 and shaft 2 62. The outer circumference of shaft 1 61 is sleeved with transmission pinion 1 63 and transmission gear 1 66 in sequence, wherein the transmission gear 1 66 is fixedly sleeved on the outer circumference of shaft 1 61, and the transmission pinion 1 63 is movably sleeved on the outer circumference of shaft 1 61. The outer circumference of shaft 2 62 is sleeved with transmission pinion 2 64 and transmission gear 2 67 in sequence, wherein the transmission gear 2 67 is fixedly sleeved on the outer circumference of shaft 1 61, and the transmission pinion 2 64 is movably sleeved on the outer circumference of shaft 1 61. The transmission gear 1 66 and the transmission gear 2 67 are meshed, and the transmission gear 1 66 is meshed with the transmission rack 5. In this embodiment, in order to ensure the stability of the meshing between the transmission rack 5 and the transmission gearwheel 1, a limiting claw 51 is installed on one side of the transmission rack 5. The limiting claw 51 is fixedly installed on the circumferential surface of the shaft 1 61, forcing the transmission rack 5 and the transmission gearwheel 1 66 to be in a meshing state at all times. The transmission pinion 1 63 and the transmission pinion 2 64 are meshed and connected through the output shaft gear 65; the transmission pinion 1 63 and the transmission pinion 2 64 are both provided with an inner ratchet 631, and the front ends of the shaft 1 61 and the shaft 2 62 are both provided with a ratchet end cover 611, and the ratchet end cover 611 is provided with a ratchet 612 matching the inner ratchet 631. The following takes the clockwise rotation of shaft 1 61 as an example: shaft 1 61 rotates clockwise and shaft 2 62 rotates counterclockwise, the ratchet pawl on shaft 1 61 is not engaged, the ratchet pawl on shaft 2 62 is engaged, shaft 2 62 drives transmission pinion 2 64 to rotate counterclockwise through the pawl, and transmission pinion 2 64 drives output shaft gear 65 to rotate clockwise; similarly, when shaft 1 61 rotates counterclockwise, the ratchet pawl on shaft 1 61 is engaged, the ratchet pawl on shaft 2 62 is not engaged, shaft 1 61 drives transmission pinion 1 63 to rotate counterclockwise through the pawl, and transmission pinion 1 63 drives output shaft gear 65 to rotate clockwise. In this way, the motion transmission function of gear set 6 is realized.

Finally, the unidirectional periodic rotation transmitted from the output shaft gear 65 is directly input into the linear electromagnetic generator to obtain a periodic current output.

In this embodiment, the preset model uses a transmission gear with a diameter of 120 mm, a transmission gear center distance of 120 mm, a transmission pinion with a diameter of 80 mm, and an output shaft gear with a diameter of 40 mm. The transmission ratio of the gear set 6 is: , that is, after a first-stage gear transmission, the output speed of the large gear can be twice as fast. The kinematic relationship is derived as follows:

In the preset model, the radius of the transmission gear is 60mm, the AO1 length (the distance from the hinge between the transmission rack and the float connecting rod to the rotation center) is 300mm, the radius of the transmission gear is 40mm, and the diameter of the output shaft gear is 40mm.

The transmission ratio of the gear set 6 is 2, and the large and small gears are coaxial. The relationship between the rotational motion of the float connecting rod 1 and the rotational speed of the transmission gear 1 66 is derived below. Theoretically, the rotational speed of the transmission gear 1 66 can be expressed as the length change of the line segment AC.

Establish the coordinate system XO1Y as shown in Figure 9. Among them, A(-300,0), B(0,h), O2(-60,h), . From the geometric relationship, we can get:

;

Taking the derivative of the above formula, we can get the linear velocity of the transmission gear 166 (unit: m/s), and the free wave surface equation is: The motion process considers the vertical motion of the connecting rod:

;

Where:

—The distance from the connection point on the float connecting rod to the rotating shaft (m);

—Radius of transmission gear (m);

—Vertical distance from the center of the gear set to the rotating shaft of the float connecting rod (m);

—free wave amplitude (m);

—circular frequency of the free wave surface;

As shown in Figure 10, in this model, R=0.3m, r=0.06m, h=0.5m;

;

Take the linear electromagnetic generator as shown in Table 1 below, and the load resistance is: ;

Table 1 Corresponding parameters of AGB37RG (A6572) motor:

The instantaneous power is taken as:

;

The energy generated by theoretically overcoming resistance in one cycle:

;

For the total energy in a single wide wave peak within a wavelength, according to the micro-wave theory:

;

The width of the entire power generation module is about 500mm. Two power generation modules can be arranged in a single wide wave surface, so the overall efficiency can be expressed as (density is taken as 1000kg/m3, g=10m/s2):

;

By calculating the formula, we can obtain a curve diagram showing how the energy generated by the entire device in one cycle changes with the circular frequency as shown in FIG11 and a curve diagram showing how the energy conversion efficiency of the device changes with the circular frequency as shown in FIG12 .

The common wave velocity range is: 10-50 km/h. The length of the float connecting rod of the device is 1 m. If the corresponding wave surface wavelength is too short, that is, the period is too short, it will not work properly. Taking the wave velocity of 5 m/s as an example, the wavelength of 2 m is taken as the limit working range. At this time, the corresponding circular frequency .

From Figure 11, we can see that as the circular frequency increases, the total energy generated by the device gradually increases from zero. When the energy captured in one cycle gradually approaches 58 J, and then the energy captured value tends to be flat. This phenomenon can be summarized as follows: when the wavelength is infinitely long, the wave surface hardly fluctuates, and then as the wavelength decreases, the wave steepness increases, and the device starts to work. At this time, the energy of the device rises rapidly due to the increase in the peak velocity. Then when When the speed is increased, the energy harvesting of the device is no longer limited by the speed peak but is affected by the speed and cycle together, and finally gradually becomes flat.

From Figure 12, it can be seen that the theoretical efficiency of a single machine can reach about 9%. For the preset model in the present invention, the energy capture efficiency can be directly improved by increasing the load resistance. By checking the strength of the components, it can be seen that the safety margin is large. At the same time, considering the actual working loss, the rear-end motor load can be increased by 5 times. At this time, the efficiency can reach 45%. At the same time, the strength of the connection of the transmission rack 5 is also within the safe use range. It should be noted that as the load of the motor increases, the motor needs to be reselected, and the influence of the size and weight of the motor needs to be paid attention to. When a high-power motor is used, the power generation efficiency can be further increased.

As for the curve variation law, by imaging the velocity curves at different circular frequencies through MATLAB, we can see that the energy of the device is obtained by integrating the velocity curve, so the area enclosed by the velocity curve and the coordinate axis can be expressed as the amount of captured energy. When the speed curve begins to tend to a high peak and a short period, the energy obtained at this time tends to a peak. Combined with the above-mentioned circular frequency limitation, the circular frequency range that the device can adapt to under the preset model size is approximately .

Energy efficiency formula used to guide design:

;

Where:

—The distance from the connection point on the float connecting rod to the rotating shaft (m);

—Radius of large gear 1 (m);

—Vertical distance from the center of the gear set to the rotating shaft of the float connecting rod (m);

—free wave amplitude (m);

—circular frequency of the free wave surface;

Fn—motor load (N);

By adjusting the device size parameters, the applicable range of the entire device can be changed to adapt to the corresponding local environment or to improve the conversion efficiency of the device.

In addition, in order to achieve efficient absorption of wave energy, it is necessary to keep the entire device facing the flow direction to obtain the maximum inclination angle of the float connecting rod 1. To this end, a guide device needs to be added to the fixed floating platform 10. Combined with the role of the rudder in adjusting the course of the hull, the guiding role of the rudder allows the hull to turn. When the rudder is fixed, the hull can always be kept facing the direction of the water flow under the action of the water flow. Based on this principle, a streamlined guide tail rudder 102 is fixed at the tail of the fixed floating platform 10 to achieve vertical operation under the action of the horizontal flow of waves.

The overall fixed floating platform 10 serves as the supporting platform for the entire wave energy conversion device. Directional buoys 101 are arranged at both ends to support the floating of the entire device. At the same time, it has a certain stability and will not move violently under the action of waves, so as to ensure that the float connecting rod 1 can have obvious relative movement relative to the fixed floating platform 10. The fixed floating platform 10 can be fixed on the marine riser. At this time, the volume is relatively small, and it only needs to ensure the floating of the whole. To make the whole work in a completely floating state, it is necessary to increase the structural size to provide a stable platform. The mounting seat 7 and the float connecting rod retaining frame 8 form a whole and are fixedly connected to the fixed floating platform 10. The same fixed floating platform 10 can be fixedly connected to multiple groups of energy conversion devices in parallel to further improve the conversion efficiency.

In the description of the present invention, the terms "first", "second", "another", and "yet another" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims (8)

1. A double-buoy wave energy conversion device, comprising a float connecting rod holder (8) with two end surfaces intersecting each other, characterized in that a float connecting rod (1) is arranged inside the float connecting rod holder (8), a float first (2) and a float second (3) extending downward are arranged on the float connecting rod (1), and the float first (2) and the float second (3) are respectively located on two sides of the float connecting rod holder (8), a connecting seat (4) is installed on one side of the upper end of the float connecting rod (1), and a transmission rack (5) is rotatably connected to the connecting seat (4), and the transmission rack (5) is meshed with a gear set (6) fixed on the float connecting rod holder (8), and the float first (2) and the float second (3) alternately rise and fall under the action of waves, driving the transmission rack (5) to perform linear reciprocating motion relative to the gear set (6), and the linear reciprocating motion of the transmission rack (5) is converted into unidirectional periodic rotational motion through the gear set (6). 2. The double-float wave energy conversion device according to claim 1 is characterized in that: two transverse guide grooves (12) are arranged on the float connecting rod (1) along its length direction, the float 1 (2) and the float 2 (3) are respectively slidably assembled in the two transverse guide grooves (12), and the ends of the float 1 (2) and the float 2 (3) away from each other are respectively provided with a limit spring 1 (21) and a limit spring 2 (31). 3. The double-buoy wave energy conversion device according to claim 2 is characterized in that: the front and rear end surfaces of the float connecting rod retainer (8) are provided with a through vertical guide groove (9) along its height direction, and the middle part of the float connecting rod (1) is connected with a fulcrum shaft (11), and the fulcrum shaft (11) is slidably assembled in the vertical guide groove (9). 4. The double-buoy wave energy conversion device according to claim 3 is characterized in that: the gear set (6) includes a shaft 1 (61) and a shaft 2 (62), and a transmission pinion 1 (63) and a transmission large gear 1 (66) are sleeved on the outer circumferential surface of the shaft 1 (61) in sequence, wherein the transmission large gear 1 (66) is fixedly sleeved on the outer circumferential surface of the shaft 1 (61), the transmission pinion 1 (63) is movably sleeved on the outer circumferential surface of the shaft 1 (61), and the outer circumferential surface of the shaft 2 (62) is sleeved on Transmission pinion 2 (64) and transmission gear 2 (67), wherein the transmission gear 2 (67) is fixedly sleeved on the outer circumferential surface of the shaft 1 (61), the transmission pinion 2 (64) is movably sleeved on the outer circumferential surface of the shaft 1 (61), the transmission gear 1 (66) and the transmission gear 2 (67) are meshed, the transmission gear 1 (66) and the transmission rack (5) are meshed, and the transmission pinion 1 (63) and the transmission pinion 2 (64) are meshed and connected via an output shaft gear (65); The transmission pinion 1 (63) and the transmission pinion 2 (64) are both provided with an inner ratchet (631), and the front ends of the shaft 1 (61) and the shaft 2 (62) are both provided with a ratchet end cover (611), and the ratchet end cover (611) is provided with a ratchet (612) matching the inner ratchet (631). 5. A wave energy power generation device, comprising the double-buoy wave energy conversion device according to any one of claims 1 to 4, characterized in that it also comprises a linear electromagnetic generator, the output shaft of the linear electromagnetic generator being transmission-connected to the output end of the gear set (6). 6. A wave energy power generation device according to claim 5, characterized in that it also comprises a fixed floating platform (10), on which a plurality of sets of double-buoy wave energy conversion devices are installed. 7. A wave energy power generation device according to claim 6, characterized in that a streamlined guiding tail rudder (102) is fixed to the tail of the fixed floating platform (10), and the streamlined guiding tail rudder (102) is used to drive the fixed floating platform (10) to always face the direction of the upstream surface. 8. A wave energy power generation device according to claim 6, characterized in that directional buoys (101) are arranged at both ends of the fixed floating platform (10) in the vertical direction.