CN216490171U - Telescopic swing motor - Google Patents

Abstract

A telescopic swing motor comprises a swing structure and a telescopic structure; the swing structure comprises a swing shaft, a swing bracket, a swing stator and a swing rotor; elastic plates are arranged at two ends of the swing bracket, and bearing seats are arranged on the elastic plates; one bearing is arranged at the front section of the swinging shaft, the other bearing is arranged at the tail end of the swinging shaft, the bearing at the front section is fixed on a bearing seat of the elastic plate at the front end, and the bearing at the tail end is fixed on a bearing seat of the elastic plate at the rear end of the swinging bracket; the telescopic structure comprises a telescopic support, a telescopic driving coil, a telescopic rotor and a telescopic magnet, wherein one end of the telescopic rotor is connected with an elastic plate at the rear end of the swing support to form a swing and telescopic combined state. The motion of the utility model can form complex space three-dimensional track motion and is suitable for a reciprocating motion system.

Description

Telescopic swing motor

Technical Field

The utility model relates to a motor, in particular to a motor combining horizontal swing and axial extension.

Background

The conventional acoustic wave motor mainly adopts a single motion mode of swinging left and right or extending and contracting axially, such as a high-frequency vibration device disclosed in chinese patent document CN 203967899U. However, the existing sound wave motor cannot adapt to the occasions requiring the requirements of simultaneous swinging and stretching.

Disclosure of Invention

The utility model aims to provide a telescopic swing motor which can realize left-right swing and axial front-back extension at the same time.

The utility model can realize the purpose, and designs a telescopic swing motor, which comprises a swing structure and a telescopic structure; the swing structure comprises swing supports, swing stators and swing rotors, wherein at least one pair of swing stators are symmetrically arranged on the swing supports, and the swing rotors are arranged between the swing stators; elastic plates are arranged at two ends of the swinging bracket, and bearing seats are arranged on the elastic plates; the swing rotor comprises a swing rotating core and a swing magnet, the swing shaft is fixed on the central axis of the swing rotating core, and the swing magnet is fixedly arranged on the swing rotating core; a bearing is arranged at the front section of the swinging shaft, a bearing is arranged at the tail end of the swinging shaft, the bearing arranged at the front section of the swinging shaft is fixed on a bearing seat of the elastic plate at the front end, and the bearing arranged at the tail end of the swinging shaft is fixed on a bearing seat of the elastic plate at the rear end of the swinging bracket; the radial supporting force of the elastic plate is more than 8 times of the axial supporting force;

the telescopic structure comprises a telescopic bracket, a telescopic driving coil, a telescopic rotor and a telescopic magnet, wherein the telescopic magnet is fixed on the telescopic rotor; the two telescopic drive coils are oppositely arranged and installed on the telescopic bracket, the telescopic rotor is arranged between the two telescopic drive coils, and the winding directions of the telescopic drive coils are the same; one end of the telescopic rotor is connected with the elastic plate at the rear end of the swing support to form a swing and telescopic combined state.

Preferably, the oscillating stator comprises an oscillating stator core, an oscillating stator coil, the oscillating stator coil being mounted on the oscillating stator core; the swing support is provided with a swing core rotating channel, swing stator core fixing grooves are formed in two sides of the swing core rotating channel, the swing rotor is installed in the swing core rotating channel, and the swing stator core is fixed on the swing support through the swing stator core fixing grooves.

Preferably, the swing support is divided into two parts symmetrically along the central axis, the dividing surface is respectively and correspondingly provided with the insertion fixing column and the insertion fixing hole, and the insertion fixing column and the insertion fixing hole are arranged on the dividing surface at one side in a diagonal manner.

Preferably, swing stator wing fixing grooves are formed at both sides of the swing stator core fixing groove, and the extended flat wing of the swing stator core is inserted into the swing stator wing fixing grooves to fix the swing stator core to the swing bracket.

Preferably, a sensor mounting groove is formed on the swing bracket.

Preferably, a swing limiting groove is formed in the swing rotary core channel, a swing limiting protrusion is radially arranged on the swing rotary core, and the swing limiting protrusion is placed in the swing limiting groove.

Preferably, the swinging core rotating surface between the swinging magnets on one side is close to one side of the stator and is lower than the outer surface of the swinging magnets; the interval arc length included angle of the swinging magnet on the swinging rotating core is smaller than the arc length included angle of the swinging stator core.

Preferably, a penetrating telescopic rotor channel is arranged in the telescopic support along the motion direction of the telescopic rotor, and telescopic drive coil accommodating grooves are formed in two sides of the telescopic rotor channel; the flexible active cell is installed in flexible active cell passageway, and flexible drive coil is installed in flexible drive coil holding tank.

Preferably, a telescopic stator core is provided, and a telescopic driving coil is arranged on the telescopic stator core; the telescopic bracket is provided with a telescopic stator iron core opening in the telescopic driving coil accommodating groove, the telescopic stator iron core opening is communicated with the telescopic rotor channel, and the telescopic stator iron core is fixed on the telescopic bracket through the telescopic stator iron core opening.

Preferably, the telescopic stator core is in a T shape, telescopic stator core fixing grooves are formed in two ends of a telescopic stator core opening, and two ends of the telescopic stator core are fixedly inserted into the telescopic stator core fixing grooves; the telescopic support is divided into two parts along the central axis, inserting and fixing columns and inserting and fixing holes are respectively and correspondingly arranged on the dividing surface, and the inserting and fixing columns and the inserting and fixing holes are diagonally arranged on the dividing surface on one side.

Preferably, the two ends of the telescopic rotor are respectively provided with a rotor fixing lock catch, the front end of the telescopic rotor is connected with an elastic plate fixed at the rear end of the swing support through the rotor fixing lock catch, the rear end of the telescopic rotor is connected with the elastic plate fixed at the rear end of the telescopic support through the rotor fixing lock catch, and the elastic plate is correspondingly provided with a fixing lock catch hole or a lock catch groove.

Preferably, the rear end of the telescopic bracket is provided with a second sensor mounting groove.

Preferably, one end of the bearing seat is provided with a bearing seat fixing lock catch, and the elastic plate is correspondingly provided with a fixing lock hole; or the bearing seat and the elastic plate are integrally formed.

The utility model can make the motion of the motor swing shaft form complex space three-dimensional track motion, including variable motion forms such as circumference, 8-shaped and the like; is suitable for use in reciprocating systems, such as electric toothbrushes, skin care devices, and the like.

Drawings

FIG. 1 is a schematic diagram of a preferred embodiment of the present invention;

FIG. 2 is an exploded view of the preferred embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a preferred embodiment of the present invention;

FIG. 4 is a schematic view of the preferred embodiment of the present invention with the housing removed;

FIG. 5 is a schematic view of the preferred embodiment of the present invention with the housing and one side bracket removed;

FIG. 6 is a schematic view of the swing structure of the preferred embodiment of the present invention with the housing and one side bracket removed;

FIG. 7 is a cross-sectional view of the swing frame and the swing rotor according to the preferred embodiment of the present invention;

FIG. 8 is a schematic cross-sectional view of a wobble stator core and a wobble rotor according to a preferred embodiment of the utility model;

FIG. 9 is a schematic cross-sectional view of the telescopic structure of the preferred embodiment of the present invention;

FIG. 10 is a schematic view of a telescoping support according to the preferred embodiment of the utility model;

FIG. 11 is a schematic view of a bearing housing according to a preferred embodiment of the present invention;

FIG. 12 is a schematic view of one of the resilient plates of the preferred embodiment of the present invention;

FIG. 13 is a schematic view of the spring plate and the bearing seat integrated together according to the preferred embodiment of the present invention.

Part number: the swing structure 1, the telescopic structure 2, the elastic plate 3, the bearing seat 4, the bearing 5, the swing shaft 6, the swing bracket 11, the swing stator 12, the swing rotor 13, the telescopic bracket 21, the telescopic driving coil 22, the telescopic mover 23, the telescopic magnet 24, the telescopic stator core 25, the fixing lock hole 31, the fixing lock hole 32, the bearing fixing lock 41, the swing rotor channel 111, the swing stator core fixing groove 112, the sensor mounting groove 113, the swing limit groove 114, the swing stator wing fixing groove 115, the swing stator core 121, the swing stator coil 122, the extension flat wing 124, the swing rotor core 131, the swing magnet 132, the swing limit protrusion 133, the telescopic mover channel 211, the telescopic driving coil receiving groove 212, the second sensor mounting groove 213, the telescopic stator core fixing groove 214, the telescopic stator core opening 215, and the mover fixing lock 231.

Detailed Description

The present invention will be further described with reference to the following examples.

As shown in fig. 1, 2 and 3, a telescopic swing motor comprises a swing structure 1 and a telescopic structure 2; the swing structure 1 comprises swing supports 11, swing stators 12 and swing rotors 13, wherein at least one pair of swing stators 12 are symmetrically arranged on the swing supports 11, and the swing rotors 13 are arranged between the swing stators 12; the oscillating stator 12 includes an oscillating stator core 121, an oscillating stator coil 122, the oscillating stator coil 122 being mounted on the oscillating stator core 121; two ends of the swing bracket 11 are provided with elastic plates 3, and the elastic plates 3 are provided with bearing seats 4; the swing rotor 13 includes a swing rotary core 131 and a swing magnet 132, the swing shaft 6 is fixed on the central axis of the swing rotary core 131, and the swing magnet 132 is fixedly installed on the swing rotary core 131; a bearing 5 is arranged at the front section of the swinging shaft 6, a bearing 5 is arranged at the tail end of the swinging shaft 6, the bearing 5 arranged at the front section of the swinging shaft 6 is fixed on the bearing seat 4 of the elastic plate 3 at the front end, and the bearing 5 at the tail end of the swinging shaft 6 is fixed on the bearing seat 4 of the elastic plate 3 at the rear end of the swinging bracket; the radial supporting force of the elastic plate 3 is more than 8 times of the axial supporting force; the telescopic structure 2 comprises a telescopic bracket 21, a telescopic driving coil 22, a telescopic rotor 23 and a telescopic magnet 24, wherein the telescopic magnet 24 is fixed on the telescopic rotor 23; the two telescopic driving coils 22 are oppositely arranged and installed on the telescopic bracket 21, the telescopic mover 23 is arranged between the two telescopic driving coils 22, and the winding directions of the telescopic driving coils 22 are the same.

The elastic plate 3 is made of metal and has the characteristics of large radial supporting force (resistance) and small axial expansion resistance. Usually designed to be more than 5 times. In the embodiment, the design is 10 times, that is, the elastic plate 3 has the similar characteristics that the radial deformation generated by inputting 10 newton force control is less than 0.1mm, and the axial deformation of the same 10 newton force control is greater than 1 mm; thereby preventing the eccentric of the rotating shaft and realizing the extension and retraction well.

As shown in fig. 11, a bearing fixing lock 41 is disposed at one end of the bearing seat 4, and a fixing lock hole 31 is correspondingly disposed on the elastic plate 3, as shown in fig. 12. The bearing seat 4 and the bearing fixing lock 41 can lock the bearing 5 on the elastic plate 3 to realize elastic connection of the swing rotor. The bearing housing 4 may also be integrally formed with the elastic plate 3, as shown in fig. 13, so as to avoid assembly tolerance caused by assembling the bearing fixing lock 41 on the elastic plate 3. The bearing housing 4 is integrally formed with the elastic plate 3, so that an assembly process can be simplified and assembly tolerance can be reduced.

As shown in fig. 7, the swing bracket 11 is provided with a swing core passage 111, swing stator core fixing grooves 112 are provided at both sides of the swing core passage 111, the swing rotor 13 is installed in the swing core passage 111, and the swing stator core 121 is fixed to the swing bracket 11 through the swing stator core fixing grooves 112.

As shown in fig. 2 and 6, the swing bracket 11 is divided into two parts along the central axis, and the dividing surfaces are respectively and correspondingly provided with insertion-fixing posts and insertion-fixing holes, and the insertion-fixing posts and the insertion-fixing holes are diagonally arranged on the dividing surface on one side, so that the swing bracket 11 can be conveniently produced and assembled.

As shown in fig. 7, swing stator wing fixing grooves 115 are provided on both sides of the swing stator core fixing groove 112, and the extended flat wing 124 of the swing stator core 121 is inserted into the swing stator wing fixing grooves 115 to fix the swing stator core 121 to the swing bracket 11, as shown in fig. 6.

As shown in fig. 2 and 4, the swing bracket 11 is provided with a sensor mounting groove 113. The sensor mounting groove 113 is provided above the swing stopper groove 114. The magnetic field intensity sensor is installed in the sensor installation groove 113, and the magnetic field intensity sensor is used for measuring the swing amplitude, and the magnetic field intensity sensor can adopt linear hall, single-axis magnetometer, three-axis magnetometer and the like, and can measure the magnetic field intensity change of the specific direction of the space position. The rotation angle of the oscillating rotary core 13 can be calculated according to the change of the space magnetic field intensity at the position, so that the oscillation amplitude of the motor and the maximum rotation angle of the rotary core, namely the oscillation amplitude of the motor can be measured.

As shown in fig. 7, a swing restricting groove 114 is provided in the swing rotary core passage 111, a swing restricting projection 133 is provided in the radial direction of the swing rotary core 131, and the swing restricting projection 133 is placed in the swing restricting groove 114.

As shown in fig. 7 and 8, the two swing magnets 132 on one side are symmetrically placed along the arc surface of the swing rotating core 131 with respect to the center line of the swing stator 12, and the magnetic poles are opposite to each other in the normal direction along the arc surface of the swing rotating core; the oscillating magnets 132 are sequentially disposed along the oscillating rotor arc surface with a gap therebetween, and the oscillating rotor arc surface between the oscillating magnets 132 on one side is adjacent to the stator and is lower than the outer surface of the oscillating magnets. The swing stator core 121 has an arc surface facing the swing axis, torque control angles are disposed at two ends of the arc surface, the arc surface is changed into a plane at the torque control angle position to form a protruding flat wing 124, an included angle between the plane protruding from the flat wing 124 and the center axis of the arc surface facing the swing center line is smaller than or equal to 90 degrees, the torque control angles are controlled by the arc length angle, and are related to the size of the rotor magnet interval, the arc length angle of the swing magnet 132 on the swing rotor core 131 is smaller than the arc length angle of the swing stator core 121, and the distance relationship is used for controlling the torque output characteristic curve requirement of the motor, including low swing angle high torque or high swing angle high torque.

As shown in fig. 9 and 10, a telescopic mover channel 211 penetrating through the telescopic holder 21 along the moving direction of the telescopic mover is provided, and telescopic drive coil receiving grooves 212 are provided on both sides of the telescopic mover channel 211; the telescopic mover 23 is installed in the telescopic mover passage 211, and the telescopic driving coils 22 are installed in the telescopic driving coil accommodating grooves 212. The telescopic bracket is of a flat structure, the telescopic bracket of the flat structure is beneficial to maximizing the utilization rate of the magnetic field of the telescopic magnet and the magnetic field of the telescopic driving coil, and the telescopic force and the electromagnetic efficiency of the motor are improved.

As shown in fig. 2 and 9, a telescopic stator core 25 is provided, and a telescopic driving coil 22 is mounted on the telescopic stator core 25; the telescopic bracket 21 is provided with a telescopic stator iron core opening 215 in the telescopic driving coil accommodating groove 212, the telescopic stator iron core opening 215 is communicated with the telescopic rotor channel 211, and the telescopic stator iron core 25 is fixed on the telescopic bracket 21 through the telescopic stator iron core opening 215.

When the stator magnetic field is magnetized, the same-direction magnetic force lines are generated between the magnets of the telescopic stator iron core and the telescopic rotor 23, and a left pulling force is formed, and when the coil current direction is changed, the stator magnetization direction is reversed, and a right pulling force is generated in the same way. By changing the direction of the current to and fro, a reciprocating motion can be created. I.e. the power principle of the fore-and-aft telescopic motion of the motor.

As shown in fig. 9, by adjusting the gap between the telescopic magnets 24, the ratio of the magnet gap to the telescopic stator core width is controlled, and the characteristic of the relationship curve between the telescopic force and the telescopic displacement can be changed. The gap between the telescopic magnets is smaller than the width of the telescopic stator core.

As shown in fig. 2, the telescopic stator core 25 is T-shaped, telescopic stator core fixing slots 214 are provided at both ends of the telescopic stator core opening 215, and both ends of the telescopic stator core 25 are inserted and fixed in the telescopic stator core fixing slots 214, as shown in fig. 9 and 10; as shown in fig. 10, the telescopic bracket 21 is divided into two parts along the central axis, the dividing surfaces are respectively and correspondingly provided with insertion fixing posts and insertion fixing holes, and the insertion fixing posts and the insertion fixing holes are arranged diagonally on the dividing surface on one side, so that the telescopic bracket 21 can be produced and assembled conveniently. The telescopic stator core 25 realizes the closing of magnetic lines of force by using the rear cover shell 20 as a metal shell.

As shown in fig. 9, mover fixing latches 231 are provided at both ends of the telescopic mover 23, respectively. As shown in fig. 3, the front end of the telescopic rotor 23 is connected to the elastic plate 3 fixed at the rear end of the swing frame 11 through a rotor fixing latch 231, the rear end of the telescopic rotor 23 is connected to the elastic plate 3 fixed at the rear end of the telescopic frame 21 through the rotor fixing latch 231, and the elastic plate 3 is correspondingly provided with a fixing latch hole or a fixing latch groove 32 for accommodating the rotor fixing latch 231; the fixing latch hole is shown in fig. 12; fixing the locking groove as shown in fig. 13 may be preferred because it is easier to save space to design the elastic force of the elastic plate, etc. The swing portion and the telescopic portion are integrally connected by the elastic plate 3 at the rear end of the swing bracket 11, as shown in fig. 3 and 5.

As shown in fig. 9 and 10, a second sensor mounting groove 213 is provided at the rear end of the telescopic bracket 21. The magnetic field intensity sensor is installed in a sensor installation groove 213 at the rear end of the telescopic bracket 21, and the magnetic field intensity sensor can adopt a linear hall, a single-axis magnetometer, a three-axis magnetometer and the like, and can measure the magnetic field intensity change of the space position, so that the telescopic displacement of the telescopic rotor 23 is measured.

Because the front-back movement and the left-right swinging dimension present an orthogonal structure, under the condition of independent control of the front-back movement and the left-right swinging dimension, the utility model can lead the movement of the swinging shaft of the motor to form a complex space three-dimensional track movement, including various changeable movement forms such as circumference, 8 shape and the like, and is more suitable for being used in a reciprocating system such as an electric toothbrush, skin care equipment and the like.

The utility model has small telescopic load and saves the mass superposition of the swinging movement; the magnetic suspension design has low noise and resistance and long service life; the fixing position is good, and the shock absorption is good; the manufacturing cost is low, and the coil is convenient to wind; the motor has good rotating dynamic balance, symmetrical motor shaft center, low noise and small vibration. The motion of the bristles can be controlled in a three-dimensional manner in the application of toothbrushes and the like.

Claims (13)

1. A telescopic oscillating motor characterized by: comprises a swing structure (1) and a telescopic structure (2); the swing structure (1) comprises a swing shaft (6), swing supports (11), swing stators (12) and swing rotors (13), wherein at least one pair of swing stators (12) are symmetrically arranged on the swing supports (11), and the swing rotors (13) are arranged between the swing stators (12); two ends of the swing bracket (11) are provided with elastic plates (3), and the elastic plates (3) are provided with bearing seats (4); the swing rotor (13) comprises a swing rotating core (131) and a swing magnet (132), the swing shaft (6) is fixed on the central axis of the swing rotating core (131), and the swing magnet (132) is fixedly arranged on the swing rotating core (131); a bearing (5) is arranged at the front section of the swinging shaft (6), a bearing (5) is arranged at the tail end of the swinging shaft (6), the bearing (5) arranged at the front section of the swinging shaft (6) is fixed on a bearing seat (4) of an elastic plate at the front end, and the bearing (5) arranged at the tail end of the swinging shaft (6) is fixed on the bearing seat (4) of the elastic plate at the rear end of the swinging bracket (11); the radial supporting force of the elastic plate (3) is more than 5 times of the axial supporting force;

the telescopic structure (2) comprises a telescopic bracket (21), a telescopic driving coil (22), a telescopic rotor (23) and a telescopic magnet (24), wherein the telescopic magnet (24) is fixed on the telescopic rotor (23); the two telescopic drive coils (22) are oppositely arranged and installed on the telescopic bracket (21), the telescopic rotor (23) is arranged between the two telescopic drive coils (22), and the winding directions of the telescopic drive coils (22) are the same; one end of the telescopic rotor (23) is connected with the elastic plate (3) at the rear end of the swing bracket (11) to form a swing and telescopic combined state.

2. The telescopic oscillating motor of claim 1, wherein: the swing stator (12) comprises a swing stator core (121) and a swing stator coil (122), wherein the swing stator coil (122) is installed on the swing stator core (121); the swing support (11) is provided with a swing core rotating channel (111), swing stator core fixing grooves (112) are formed in two sides of the swing core rotating channel (111), a swing rotor (13) is installed in the swing core rotating channel (111), and a swing stator core (121) is fixed on the swing support (11) through the swing stator core fixing grooves (112).

3. The telescopic oscillating motor of claim 2, wherein: the swing support (11) is divided into two parts along the central axis, inserting and fixing columns and inserting and fixing holes are respectively and correspondingly arranged on the dividing surface, and the inserting and fixing columns and the inserting and fixing holes are arranged on the opposite angles of the dividing surface on one side.

4. The telescopic oscillating motor of claim 3, wherein: swing stator wing fixing grooves (115) are formed in two sides of the swing stator core fixing groove (112), a protruding flat wing (124) of the swing stator core (121) is inserted into the swing stator wing fixing grooves (115), and the swing stator core (121) is fixed to the swing support (11).

5. The telescopic oscillating motor of claim 2, wherein: the swing bracket (11) is provided with a sensor mounting groove (113).

6. The telescopic oscillating motor of claim 1, wherein: a swing limiting groove (114) is formed in the swing rotating core channel (111), a swing limiting protrusion (133) is radially arranged on the swing rotating core (131), and the swing limiting protrusion (133) is placed in the swing limiting groove (114).

7. The telescopic oscillating motor of claim 1, wherein: the swinging core rotating surface between the swinging magnets (132) on one side is close to one side of the stator and is lower than the outer surface of the swinging magnets; the interval arc length included angle of the swing magnet (132) on the swing rotating core (131) is smaller than the arc length included angle of the swing stator core (121).

8. The telescopic oscillating motor according to claim 1, wherein: a penetrating telescopic rotor channel (211) is arranged in the telescopic support (21) along the motion direction of the telescopic rotor, and telescopic drive coil accommodating grooves (212) are arranged on two sides of the telescopic rotor channel (211); the telescopic rotor (23) is arranged in the telescopic rotor channel (211), and the telescopic driving coil (22) is arranged in the telescopic driving coil accommodating groove (212).

9. The telescopic oscillating motor of claim 1, wherein: the telescopic stator is provided with a telescopic stator core (25), and a telescopic driving coil (22) is arranged on the telescopic stator core (25); a telescopic stator iron core opening (215) is formed in a telescopic driving coil accommodating groove (212) of the telescopic support (21), the telescopic stator iron core opening (215) is communicated with a telescopic rotor channel (211), and a telescopic stator iron core (25) is fixed on the telescopic support (21) through the telescopic stator iron core opening (215).

10. The telescopic oscillating motor of claim 9, wherein: the telescopic stator core (25) is in a T shape, telescopic stator core fixing grooves (214) are formed in two ends of a telescopic stator core opening (215), and two ends of the telescopic stator core (25) are fixedly inserted into the telescopic stator core fixing grooves (214); the telescopic support (21) is divided into two parts along the central axis, inserting and fixing columns and inserting and fixing holes are respectively and correspondingly arranged on the dividing surface, and the inserting and fixing columns and the inserting and fixing holes are arranged on the opposite angles of the dividing surface on one side.

11. The telescopic oscillating motor of claim 8, wherein: the two ends of the telescopic rotor (23) are respectively provided with a rotor fixing lock catch (231), the front end of the telescopic rotor (23) is connected with an elastic plate (3) fixed at the rear end of the swing support (11) through the rotor fixing lock catch (231), the rear end of the telescopic rotor (23) is connected with the elastic plate (3) fixed at the rear end of the telescopic support (21) through the rotor fixing lock catch (231), and the elastic plate (3) is correspondingly provided with a fixing lock catch hole or a lock catch groove (32).

12. The telescopic oscillating motor of claim 7, wherein: the rear end of the telescopic bracket (21) is provided with a second sensor mounting groove (213).

13. The telescopic oscillating motor of claim 1, wherein: one end of the bearing seat (4) is provided with a bearing seat fixing lock catch (41), and the elastic plate (3) is correspondingly provided with a fixing lock hole (31); or the bearing seat (4) and the elastic plate (3) are integrally formed.

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