High overload three-phase brushless motor

Abstract

The application relates to the technical field of motor equipment, and discloses a high-overload three-phase brushless motor, which comprises a shell, a plurality of insertion grooves are formed in the side wall of the shell, a bolt is slidably connected in the insertion grooves, and a rotating shaft is rotatably connected in the shell. When the spring elasticity is used to reduce the gap and the running deviation of the rotating shaft, the situation that the rotating shaft and the magnetic steel are damaged or rubbed during the rotation process under the high-overload condition due to the excessively large gap formed between the rotating shaft and the surrounding structure under the high-overload condition can be reduced, the operation accuracy and stability of the equipment during the high-overload process are ensured, and the reliability of the equipment during the operation is improved.

Description

Technical Field

[0001] This invention relates to the field of motor equipment technology, specifically to a high overload three-phase brushless motor. Background Technology

[0002] A three-phase brushless DC motor is a motor with three-phase windings, no brushes and a commutator, and is driven by DC power through an inverter circuit. The three-phase brushless DC motor uses the interaction of magnetic fields to convert electrical energy into mechanical energy.

[0003] When a brushless motor rotates rapidly under high overload conditions, the motor shaft is prone to axial movement due to the inertial force during rapid rotation. When the motor shaft moves axially, it can easily cause friction between the magnets and the stator core inside the motor, or even cause the shaft to jam, affecting the motor's operating accuracy and reliability under high overload conditions. Summary of the Invention

[0004] The purpose of this invention is to provide a high overload three-phase brushless motor to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to a high overload three-phase brushless motor, comprising a housing, with several slots formed on the side wall of the housing, pins slidably connected inside the slots, and a rotating shaft rotatably connected inside the housing, and further comprising:

[0007] A limiting mechanism, installed inside the housing, is used to prevent vibration during operation of the equipment.

[0008] The auxiliary mechanism is installed on the side wall of the limiting mechanism, which enables the internal structure of the limiting mechanism to operate synchronously when the limiting mechanism is working.

[0009] Furthermore, the housing includes:

[0010] A fixing component is mounted on the outer surface of the shaft.

[0011] A closing component is installed on the side wall of the fixed component;

[0012] The connecting component is installed on the side wall of the fixed component.

[0013] Furthermore, the limiting mechanism includes a lower fixing ring for the magnet disposed on the outer surface of the rotating shaft, and the limiting mechanism also includes:

[0014] The limiting component is installed on the side wall of the lower fixing ring of the magnet;

[0015] A blocking component is installed on the side wall of the limiting component.

[0016] Furthermore, the auxiliary mechanism includes several connecting plates disposed on the sidewall of the limiting component, and the auxiliary mechanism also includes:

[0017] Deformation component, which is installed on the side wall of the connecting plate.

[0018] Furthermore, the fixing component includes a magnet fixedly connected to the outer surface of the rotating shaft, and the outer surface of the magnet is fixedly connected with a winding.

[0019] The closing assembly includes an upper bearing rotatably connected to the outer surface of the shaft, a top cover rotatably connected to the outer surface of the upper bearing, and a pressure ring internally threaded onto the top cover;

[0020] The outer surface of the rotating shaft is fixedly connected to a magnet with a retaining ring.

[0021] Furthermore, the connecting assembly includes a bottom cover that is slidably connected inside the housing, a lower bearing that is rotatably connected inside the bottom cover, and the inner wall of the lower bearing that is rotatably connected to the outer surface of the rotating shaft.

[0022] The side wall of the bottom cover is provided with a PCB board, and a PCB protective pad is fixedly connected to the side wall of the PCB board.

[0023] Furthermore, the lower fixing ring of the magnet is fixedly connected to the outer surface of the rotating shaft, and the inner wall of the PCB board is rotatably connected to the inner wall of the PCB board;

[0024] Two inclined rings are fixedly connected to the inner wall of the lower fixing ring of the magnet, and the two inclined rings are arranged symmetrically.

[0025] Furthermore, the limiting component includes a fixing plate fixedly connected to the side wall of the lower bearing, and three curved plates are fixedly connected to the side wall of the fixing plate, with two rectangular grooves opened on the side wall of the curved plates.

[0026] The rectangular groove has a sliding connection with triangular blocks inside.

[0027] Furthermore, a spring is fixedly connected to the side wall of the lower fixing ring of the magnet, and the end of the spring away from the lower fixing ring of the magnet is fixedly connected to the side wall of the fixing plate.

[0028] The blocking assembly includes an elastic plate fixedly connected to the side wall of the curved plate. Two protruding rods are fixedly connected to the side of the elastic plate near the triangular block, and the side walls of the protruding rods are in contact with the side walls of the triangular block.

[0029] Furthermore, the connecting plate comes into contact with the sidewall of the bent plate;

[0030] The deformation component includes a corrugated plate on the side wall of the connecting plate, and an elastic plate is fixedly connected to the side wall of the corrugated plate.

[0031] A middle plate is fixedly connected between the two corrugated plates.

[0032] The present invention has the following beneficial effects:

[0033] 1. This invention utilizes the elastic force of a spring to regulate the gap between the rotating shaft and the bottom cover, reducing axial movement of the rotating shaft under high overload conditions. Simultaneously, by reducing gap and axial movement during shaft operation, the spring force also minimizes damage or friction to the rotating shaft and magnets caused by excessive gaps between the shaft and surrounding structures under high overload conditions. This ensures the operational accuracy and stability of the equipment under high overload conditions, improving its reliability.

[0034] 2. In this invention, when the spring restricts the axial movement of the rotating shaft, the spring is prone to resonance. Since the spring is initially in a compressed state, when the rotating shaft moves axially, the spring will exert a thrust on the rotating shaft. At this time, the triangular block can restrict the spring from freely rebounding when the rotating shaft rotates. By restricting the spring's rebound by the triangular block, the spring resonance caused by restricting the axial movement of the rotating shaft can be reduced, improving the stability of the spring in preventing the rotating shaft from moving axially and improving the operating efficiency of the equipment.

[0035] 3. This invention, by separating the triangular block from the spring, can reduce the obstruction of the triangular block at the spring spacing when the rotating shaft and the lower fixing ring of the magnet are reset after axial movement. This can prevent the spring and the lower fixing ring of the magnet from being difficult to reset or cause the triangular block to collide with the spring during the reset process. This ensures that the spring can operate stably during the process of preventing the rotating shaft from axial movement, while further enhancing the operating strength and efficiency of the spring when providing preload to the rotating shaft.

[0036] 4. In this invention, when the bending plate resets, the corrugated plate and the second elastic plate will reset simultaneously. At this time, when the corrugated plate and the second elastic plate reset, they can fit together between the inner wall of the bending plate and the connecting plate, and block the bending plate and the connecting plate. By blocking the bending plate, the swaying of the bending plate under the centrifugal force generated when the shaft rotates rapidly can be reduced. By limiting the stability of the bending plate's position when the shaft rotates rapidly, the swaying of the bending plate during the rotation of the shaft can be reduced, and the stability of the equipment during operation can be further improved.

[0037] 5. Before operation, the device is inserted into the slot on the outer surface of the housing by the operator using pins. At this time, the connection between the top cover and the bottom cover is not solely based on the threaded connection. Instead, it achieves rigid positioning by inserting multiple pins evenly distributed on the circumference of the housing, which in turn form the structural skeleton of the device under overload conditions. At the same time, the pins can also bear most of the radial and axial impact loads when the device is operating under high overload conditions, reducing the possibility of failure of the threaded connection between the top cover, bottom cover and housing due to excessive shear force.

[0038] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 This is a schematic diagram of the overall partial cross-sectional structure of the present invention;

[0042] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0043] Figure 4 This is a schematic diagram of the overall half-section structure of the present invention;

[0044] Figure 5 This is a partial cross-sectional schematic diagram of the fixing component of the present invention;

[0045] Figure 6 This is a partial cross-sectional view of the lower fixing ring of the magnet in this invention.

[0046] Figure 7 This is a schematic diagram of the limiting component structure of the present invention;

[0047] Figure 8 For the present invention Figure 7 Enlarged view of point B in the middle;

[0048] Figure 9 This is a partial cross-sectional structural diagram of the blocking component of the present invention;

[0049] Figure 10 This is a schematic diagram of the deformation component structure of the present invention.

[0050] The attached diagram lists the components represented by each number as follows:

[0051] In the diagram: 1. Housing; 101. Shaft; 11. Fixing assembly; 111. Magnet; 112. Winding wire; 12. Closing assembly; 121. Upper fixing ring of magnet; 122. Pressure ring; 123. Top cover; 13. Connecting assembly; 131. Bottom cover; 132. Lower bearing; 133. PCB board; 134. PCB protective pad; 2. Restricting mechanism; 201. Lower fixing ring of magnet; 202. Tilt ring; 21. Restricting assembly; 211. Fixing plate; 212. Bending plate; 213. Triangular block; 22. Blocking assembly; 221. Elastic plate one; 222. Protruding rod; 3. Auxiliary mechanism; 301. Connecting plate; 31. Deformation assembly; 311. Wave plate; 312. Elastic plate two; 4. Pin. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Please see Figure 1 - Figure 10 As shown, the present invention is a high overload three-phase brushless motor, including a housing 1, a plurality of slots are provided on the side wall of the housing 1, pins 4 are slidably connected inside the slots, and a rotating shaft 101 is rotatably connected inside the housing 1, and further includes:

[0054] The limiting mechanism 2 is installed inside the housing 1 to prevent vibration when the device is working.

[0055] Auxiliary mechanism 3 is installed on the side wall of the limiting mechanism 2, which enables the internal structure of the limiting mechanism 2 to operate synchronously when the limiting mechanism 2 is working.

[0056] Housing 1 includes:

[0057] Fixing component 11 is mounted on the outer surface of rotating shaft 101;

[0058] Closure component 12 is installed on the side wall of fixed component 11;

[0059] The connecting component 13 is installed on the side wall of the fixing component 11.

[0060] The limiting mechanism 2 includes a lower fixing ring 201 of magnet disposed on the outer surface of the rotating shaft 101, and the limiting mechanism 2 also includes:

[0061] Restriction component 21 is installed on the side wall of the lower fixing ring 201 of the magnet;

[0062] The blocking component 22 is installed on the side wall of the limiting component 21.

[0063] The auxiliary mechanism 3 includes a plurality of connecting plates 301 disposed on the side wall of the limiting component 21, and the auxiliary mechanism 3 also includes:

[0064] Deformation component 31 is installed on the side wall of connecting plate 301.

[0065] The fixing component 11 includes a magnet 111 fixedly connected to the outer surface of the rotating shaft 101, and a winding 112 is fixedly connected to the outer surface of the magnet 111;

[0066] The closing assembly 12 includes an upper bearing rotatably connected to the outer surface of the rotating shaft 101, a top cover 123 rotatably connected to the outer surface of the upper bearing, and a pressure ring 122 threadedly connected to the inside of the top cover 123;

[0067] Among them, the outer surface of the rotating shaft 101 is fixedly connected to the upper fixing ring 121 of the magnet. The spring on the side wall of the lower fixing ring 201 of the magnet will act on the right end of the rotating shaft 101 through the magnet 111 and the upper fixing ring 121 under the action of its own accumulated elastic potential energy.

[0068] The connecting assembly 13 includes a bottom cover 131 that is slidably connected inside the housing 1. A lower bearing 132 is rotatably connected inside the bottom cover 131, and the inner wall of the lower bearing 132 is rotatably connected to the outer surface of the rotating shaft 101.

[0069] A PCB board 133 is provided on the side wall of the bottom cover 131, and a PCB protective pad 134 is fixedly connected to the side wall of the PCB board 133.

[0070] The lower fixing ring 201 of the magnet is fixedly connected to the outer surface of the rotating shaft 101, and the inner wall of the PCB board 133 is rotatably connected to the inner wall of the PCB board 133.

[0071] Two inclined rings 202 are fixedly connected to the inner wall of the lower fixing ring 201 of the magnet. The two inclined rings 202 are symmetrically arranged. When the lower fixing ring 201 of the magnet moves with the rotating shaft 101, the inclined rings 202 inside the lower fixing ring 201 of the magnet will push the curved surface of the bending plate 212 through their inclined surfaces.

[0072] The limiting component 21 includes a fixing plate 211 fixedly connected to the side wall of the lower bearing 132. The side wall of the fixing plate 211 is fixedly connected to three bending plates 212, and the side wall of the bending plates 212 has two rectangular grooves.

[0073] The rectangular groove has a sliding connection of triangular blocks 213. When the bent end of the bent plate 212 is pushed, the bent plate 212 will drive the two triangular blocks 213 inside to move closer to the spring.

[0074] A spring is fixedly connected to the side wall of the lower fixing ring 201 of the magnet, and the end of the spring away from the lower fixing ring 201 of the magnet is fixedly connected to the side wall of the fixing plate 211.

[0075] The blocking assembly 22 includes an elastic plate 221 fixedly connected to the side wall of the curved plate 212. Two protruding rods 222 are fixedly connected to the side of the elastic plate 221 near the triangular block 213. The side wall of the protruding rods 222 is in contact with the side wall of the triangular block 213.

[0076] The connecting plate 301 is in contact with the side wall of the bending plate 212;

[0077] The deformation component 31 includes a corrugated plate 311 on the side wall of the connecting plate 301, and an elastic plate 312 is fixedly connected to the side wall of the corrugated plate 311.

[0078] A middle plate is fixedly connected between the two wave plates 311. When the wave plates 311 are compressed, the multiple wave plates 311 will contract synchronously through the relatively connected middle plate. At this time, the multiple wave plates 311 will also cause the three curved plates 212 to move synchronously through the middle plate.

[0079] In use, the device is first connected to the PCB board 133 via wires. Then, after the PCB board 133 is powered on, power is input to the winding 112, which generates a rotating magnetic field. At this time, the magnetic field is transmitted to the magnet 111, which in turn causes the rotating shaft 101 to drive the upper fixing ring 121 of the magnet, the magnet 111, the lower fixing ring 201 of the magnet, the lower bearing 132 and the upper bearing to rotate, thus completing the operation of the device.

[0080] When this device is working, the spring on the side wall of the lower fixing ring 201 of the magnet will, under the action of its own accumulated elastic potential energy, drive the rotating shaft 101 through the magnet 111 and the upper fixing ring 121 of the magnet, and then act on the right end of the rotating shaft 101. This ensures that the pressure of the spring can always act on the axial direction of the rotating shaft 101 and form an axial preload. The elastic force on the spring can adjust the gap between the rotating shaft 101 and the bottom cover 131, reducing the axial movement of the rotating shaft 101 under high overload conditions. At the same time, by reducing the gap and movement of the rotating shaft 101 during operation, the elastic force of the spring can reduce the damage or friction of the rotating shaft 101 and the magnet 111 during rotation under high overload conditions due to excessive gap between the rotating shaft 101 and the surrounding structure. This ensures the operating accuracy and stability of the equipment under high overload conditions and improves the reliability of the equipment during operation.

[0081] When the rotating shaft 101 moves axially, it drives the lower fixing ring 201 of the magnet to move. As the lower fixing ring 201 moves with the rotating shaft 101, the inclined ring 202 inside the lower fixing ring 201 pushes the curved surface of the bending plate 212 through its inclined surface. When the curved end of the bending plate 212 is pushed, the bending plate 212 will drive the two triangular blocks 213 inside to move closer to the spring. Since the spring provides preload to the rotating shaft 101 to prevent it from moving axially, the spacing between the threads on the spring will increase when the spring pushes the rotating shaft 101 through the lower fixing ring 201 of the magnet. At this time, when the bending plate 212 approaches the spring, it will drive the triangular blocks 213 to insert into the threads on the spring. Between these points, the triangular block 213 and the spring can achieve interference damping during interlocking. Since the spring force can counteract the axial movement of the rotating shaft 101 under high overload conditions and the spring itself is an elastic structure, the spring is prone to resonance when it restricts the movement of the rotating shaft 101. Since the spring is initially in a compressed state, when the rotating shaft 101 moves, the spring will apply a thrust to the rotating shaft 101. At this time, the triangular block 213 can restrict the spring from freely rebounding when the rotating shaft 101 rotates. By restricting the spring's rebound through the triangular block 213, the spring resonance caused by restricting the axial movement of the rotating shaft 101 can be reduced, improving the stability of the spring in preventing the rotating shaft 101 from moving and improving the operating efficiency of the equipment.

[0082] Because the spring generates a reciprocating compression force when restricting the movement of the rotating shaft 101, when the spring is compressed and resets after being subjected to the movement of the rotating shaft 101 during operation, the spring's reset will squeeze the side wall of the triangular block 213. When the triangular block 213 is squeezed by the spring's contraction, it will slide in the sliding groove and push the elastic plate 221. When the elastic plate 221 is pushed, it will bulge outward. At this time, the triangular block 213 can move in accordance with the spring's contraction force when the spring contracts. Separation is achieved, and by separating the triangular block 213 from the spring, when the rotating shaft 101 and the lower fixing ring 201 of the magnet return to their original positions after axial movement, the sliding of the triangular block 213 can reduce the obstruction of the triangular block 213 at the spring spacing, which could cause the spring and the lower fixing ring 201 of the magnet to have difficulty returning to their original positions or cause the triangular block 213 to collide with the spring during the resetting process. This ensures that the spring can operate stably during the process of preventing the rotating shaft 101 from axial movement, while further enhancing the operating strength and efficiency of the spring when providing preload to the rotating shaft 101.

[0083] When the bending plate 212 is pushed by the inclined surface of the inclined ring 202, the bending plate 212 moves closer to the spring and squeezes the middle of the wave plate 311 through the connecting plate 301. After the wave plate 311 is squeezed, multiple wave plates 311 will contract synchronously through the relatively connected intermediate plate. At this time, multiple wave plates 311 will also cause the three bending plates 212 to move synchronously through the intermediate plate. At the same time, when the bending plate 212 pushes the wave plate 311 through the connecting plate 301, the wave plates 311 will contract relative to each other. When the wave plate 311 contracts, it will squeeze the elastic plate 312. At this time, the elastic plate 312 will produce an outward convex deformation and contact the side wall of the connecting plate 301, exhibiting Figure 10 In the state of bending plate 212, the deformed elastic plate 312 ensures the stability and strength of bending plate 212 during operation. When bending plate 212 resets, corrugated plate 311 and elastic plate 312 reset synchronously. At this time, when corrugated plate 311 and elastic plate 312 reset, they can fit between bending plate 212 and the inner wall of connecting plate 301 and block between bending plate 212 and connecting plate 301. By blocking bending plate 212, the swaying of bending plate 212 under the centrifugal force generated when rotating shaft 101 rotates rapidly can be reduced. By limiting the stability of bending plate 212's position when rotating shaft 101 rotates rapidly, the swaying of bending plate 212 during the rotation of shaft 101 can be reduced, and the smoothness of the equipment operation can be further improved.

[0084] Before operation, the device is inserted into the slot on the outer surface of the housing 1 by the operator using the pins 4. At this time, the connection between the device and the top cover 123 and the bottom cover 131 is not solely based on the threaded connection. Instead, it achieves rigid positioning by inserting multiple pins 4 evenly distributed around the circumference of the housing 1, which in turn enable the pins 4 to form the structural skeleton of the device under overload conditions. At the same time, the pins 4 can also bear most of the radial and axial impact loads when the device is operating under high overload conditions, reducing the possibility of failure of the threaded connection between the top cover 123, the bottom cover 131 and the housing 1 due to excessive shear force.

[0085] The overall materials used in this equipment can be selected based on high strength, impact resistance, and low loss.

[0086] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high overload three-phase brushless motor, comprising a shell (1), a plurality of slots are formed in the side wall of the shell (1), a plug (4) is slidably connected in the slot, a rotating shaft (101) is rotatably connected in the shell (1), characterized in that, Also include: Limiting mechanism (2), the limiting mechanism (2) is installed and arranged in the inside of the shell (1), for preventing the occurrence of jitter when the brushless motor works; The limiting mechanism (2) includes a magnetic steel lower fixing ring (201) arranged on the outer surface of the rotating shaft (101), and a limiting assembly (21) arranged on the side wall of the magnetic steel lower fixing ring (201); The blocking assembly (22) is arranged on the side wall of the limiting assembly (21); The inner wall of the magnetic steel lower fixing ring (201) is fixedly connected with two inclined rings (202), and the two inclined rings (202) are symmetrically arranged, and the side wall of the magnetic steel lower fixing ring (201) is fixedly connected with a spring; The auxiliary mechanism (3) is arranged on the side wall of the limiting mechanism (2), and the structure inside the limiting mechanism (2) can be synchronized when the limiting mechanism (2) works; The auxiliary mechanism (3) includes a plurality of connecting plates (301) arranged on the side wall of the limiting assembly (21), and a deformation assembly (31) arranged on the side wall of the connecting plate (301); The limiting assembly (21) includes a fixed plate (211) fixedly connected to the side wall of the lower end bearing (132), and the side wall of the fixed plate (211) is fixedly connected with three curved plates (212), and the side wall of the curved plate (212) is provided with two rectangular grooves; The inside of the rectangular groove is slidably connected with a triangular block (213).

2. A high overload three-phase brushless motor according to claim 1, characterized in that: The shell (1) includes: The fixed assembly (11) is arranged on the outer surface of the rotating shaft (101); The closing assembly (12) is arranged on the side wall of the fixed assembly (11); The connecting assembly (13) is arranged on the side wall of the fixed assembly (11).

3. A high overload three-phase brushless motor according to claim 2, characterized in that: The fixed assembly (11) includes a magnetic steel (111) fixedly connected to the outer surface of the rotating shaft (101), and the outer surface of the magnetic steel (111) is fixedly connected with a winding (112); The closing assembly (12) includes an upper end bearing rotatably connected to the outer surface of the rotating shaft (101), and the outer surface of the upper end bearing is rotatably connected with a top cover (123), and the inside of the top cover (123) is threadedly connected with a pressing ring (122); Wherein, the outer surface of the rotating shaft (101) is fixedly connected with a magnetic steel upper fixing ring (121).

4. A high overload three-phase brushless motor according to claim 3, characterized in that: The connecting assembly (13) includes a bottom cover (131) slidably connected inside the shell (1), the bottom cover (131) is rotatably connected with a lower end bearing (132), and the inner wall of the lower end bearing (132) is rotatably connected to the outer surface of the rotating shaft (101); The side wall of the bottom cover (131) is provided with a PCB board (133), and the side wall of the PCB board (133) is fixedly connected with a PCB protection pad (134).

5. A high overload three-phase brushless motor according to claim 4, characterized in that: The magnetic steel lower fixing ring (201) is fixedly connected to the outer surface of the rotating shaft (101), and the inner wall of the PCB board (133) is rotatably connected to the inner wall of the PCB board (133).

6. A high overload three-phase brushless motor according to claim 5, characterized in that: The spring is fixedly connected to the side wall of the fixed plate (211) at one end away from the fixed ring (201) of the magnetic steel; The blocking assembly (22) comprises an elastic plate one (221) fixedly connected to the side wall of the curved plate (212), two protruding rods (222) are fixedly connected to one side of the elastic plate one (221) close to the triangular block (213), and the side wall of the protruding rod (222) is in contact with the side wall of the triangular block (213).

7. A high overload three-phase brushless motor according to claim 6, characterized in that: The connecting plate (301) is in contact with the side wall of the curved plate (212); The deformation assembly (31) comprises a wave plate (311) on the side wall of the connecting plate (301), and the side wall of the wave plate (311) is fixedly connected with an elastic plate two (312); The two wave plates (311) are fixedly connected with an intermediate plate.

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