Amplitude adjustment mechanism of fascia gun with magnetic sensor

Abstract

The utility model discloses a fascia gun amplitude adjustment mechanism with a magnetic sensor in the field of massage equipment, including an amplitude change mechanism, an adjustment mechanism, a magnetic sensor and a control mainboard. The amplitude adjustment rod in the amplitude change mechanism is hinged with a slider in the adjustment mechanism. The slider moves linearly under the drive of the driving mechanism. The slider is provided with a magnetic part. The magnetic sensor is used to detect the magnetic field strength or magnetic field direction generated by the magnetic part, thereby obtaining the position information of the slider, and sending the position information of the slider to the control mainboard electrically connected to the magnetic sensor. In the amplitude adjustment process, the magnetic sensor is used to obtain the current position of the slider and the corresponding actual amplitude, so as to correct the amplitude adjustment error caused by the adjustment mechanism or the driving mechanism, thereby improving the amplitude control accuracy and massage effect of the fascia gun. In addition, the system can also control the driving mechanism to stop or reverse when the slider is about to reach its limit position of movement, thereby increasing the safety of amplitude adjustment.

Description

Technical Field

[0001] The utility model relates to the field of massage equipment, in particular to a fascia gun amplitude adjustment mechanism with a magnetic sensor. Background Art

[0002] The fascia gun, also known as the deep myofascial impactor, is a soft tissue massage tool that relaxes the body's soft tissues through high-frequency impacts. The existing fascia gun drives the massage head to make linear reciprocating motion through the piston. The massage head contacts the human body and generates high-frequency vibrations that act on the deep muscles, reducing local tissue tension, relieving pain, and promoting blood circulation. The existing fascia gun has realized the function of adjusting the amplitude of the massage head, which allows users to choose the appropriate fascia gun amplitude depth for massage therapy according to their own situation. For example, professional athletes need a deep amplitude depth to relieve muscles after exercise. When ordinary consumers, especially novices, use fascia guns, they need to use a fascia gun with a shallow amplitude depth at first, and then gradually deepen the amplitude as needed.

[0003] Regarding the amplitude adjustment mechanism of the fascia gun, the applicant has previously applied for relevant patent applications for stepless amplitude adjustment, such as Chinese patent CN116155027A, which has disclosed a specific method of adjusting the position of the amplitude adjustment rod by adjusting the motor to drive the screw to rotate. However, in actual use, due to the gap between the screw and the slider, the cumulative error of the position of the slider on the screw will increase after long-term use, that is, the actual position of the slider is inconsistent with the theoretical position, resulting in a deviation between the actual amplitude and the theoretical amplitude. Feedback to the user is that the amplitude adjustment is inaccurate and cannot achieve a precise massage effect. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the existing fascia gun amplitude adjustment mechanism, the technical problem to be solved by the utility model is: to provide a fascia gun amplitude adjustment mechanism with a magnetic sensor capable of checking the actual position of the slider.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The fascia gun amplitude adjustment mechanism with a magnetic sensor includes an amplitude change mechanism and an adjustment mechanism, wherein the adjustment end of the amplitude adjustment rod in the amplitude change mechanism is hinged with the slider in the adjustment mechanism, and the slider moves linearly under the drive mechanism. It also includes a magnetic sensor and a magnetic part arranged on the slider, and a control mainboard, wherein the magnetic sensor is used to detect the magnetic field strength or magnetic field direction generated by the magnetic part, so as to obtain the position information of the slider, and the control mainboard is electrically connected to the magnetic sensor and obtains the position information of the slider in real time. The control mainboard controls the start and stop of the driving mechanism based on the position information of the slider, including the start state such as forward rotation, reverse rotation or a specific number of rotations, and the stop state. By pre-entering the corresponding relationship between the slider position and the magnetic field strength or magnetic field direction in the control mainboard, the current position of the slider can be obtained through the magnetic field strength and magnetic field direction generated by the magnetic part at its own position sensed by the magnetic sensor. The corresponding relationship between the slider position information and the amplitude is also stored in the control mainboard, so the system can obtain the actual amplitude under the current working state. When designing the adjustment mechanism, there will be a corresponding relationship between the adjustment position of the slider and the theoretical amplitude. When the system finds through comparison that the actual amplitude is inconsistent with the theoretical amplitude, the theoretical amplitude corresponding to the current position of the slider can be adjusted according to the actual amplitude, thereby realizing the correction of the amplitude adjustment error caused by the adjustment mechanism or the driving mechanism.

[0007] On the other hand, since the slider has an extreme position when sliding, after the slider moves to the extreme position, if the adjusting mechanism does not promptly know the position of the slider and continues to apply force, there is a risk of the slider colliding or getting stuck at the extreme position, causing adjustment failure. When a magnetic sensor is used to directly obtain the current position information of the slider after sliding, the position information of the slider can be fed back in time and the adjusting mechanism can be stopped in time to avoid the risk of the slider moving to the extreme position.

[0008] When installing the magnetic sensor, the magnetic sensor can be placed on a detection circuit board on the bracket of the adjustment mechanism, and the detection circuit board is electrically connected to the fascia gun control main board. The detection circuit board is used as a fixing base for the magnetic sensor on the one hand, and also supplies power to it and transmits information to the control main board on the other hand.

[0009] When the magnetic member is provided, the slider may be integrally made of magnetic material, or the magnet may be fixed on the slider by inlaying.

[0010] For the adjustment mechanism, a screw-nut transmission mechanism is preferred, specifically, the adjustment mechanism also includes a bracket and a screw and a guide slide rod installed on the bracket, the two ends of the screw are rotatably set on the bracket, the guide slide rod is parallel to the screw rod and fixed on the bracket at both ends, the slider is threadedly connected to the screw rod, and is slidably connected to the guide slide rod, and the driving mechanism includes an adjustment motor and a reduction gear installed on the bracket, and the adjustment motor drives the screw rod to rotate through the reduction gear. Among them, the bracket and the motor bracket of the fascia gun can adopt an integrated molding structure to improve the stability of the structure and ensure the installation accuracy between the various parts. In addition, the guide slide rod preferably includes two, which are symmetrically arranged on both sides of the screw rod, so that the guide slide rod can play a good supporting role when the screw rod is rotated forward and reversed.

[0011] Furthermore, the adjustment motor is electrically connected to the control main board and is configured to stop working or reverse a specific angle when the magnetic sensor detects that the slider moves to the two ends of the bracket. The effect of such configuration is to avoid the collision between the slider and the bracket or the jamming of the slider and the screw rod due to the accumulated error between the slider and the screw rod.

[0012] In order to control the operation of the driving mechanism and adjust the amplitude intuitively, the utility model is also provided with a control mechanism, which includes a housing bracket fixedly connected to the housing of the fascia gun, and a knob cover rotatably arranged on the housing bracket, wherein a rotary encoder switch is arranged in the housing bracket, and the knob cover is connected to the knob of the rotary encoder switch, and the rotary encoder switch is electrically connected to the control mainboard. The rotary encoder switch is adjusted by rotating the knob cover, and the rotary encoder switch sends a signal to the control mainboard to control the rotation of the adjustment motor. The rotation angle corresponding to the amplitude can be marked on the knob cover, thereby realizing intuitive adjustment of the amplitude.

[0013] In order to make the structure compact, the control main board can be arranged in the shell bracket, and the knob cover is an annular structure, in the middle of which is provided with a panel fixedly connected to the shell bracket, and the panel is provided with a digital tube corresponding to the LED light on the control main board, and the panel is provided with buttons corresponding to the control buttons on the control main board, and a dustproof sealing ring is provided between the knob cover and the shell bracket. The digital tube is mainly used to display the amplitude, and the signal source for controlling its display can be the rotation angle of the knob cover, or it can be the amplitude information determined by the magnetic sensor according to the position of the slider. The dustproof sealing ring is used to increase the sealing effect of the structure to prevent dust from entering the fascia gun through the gap between the knob cover and the shell bracket. In addition, since the control main board is close to the adjustment mechanism, the magnetic sensor can be arranged on the control main board, and the magnetic part is arranged on the side of the slider facing the control main board, which can save a detection circuit board.

[0014] The beneficial effects of the utility model are as follows: by adding a magnetic sensor on the basis of the original amplitude adjustment mechanism, and arranging a magnetic part on the slider for adjusting the amplitude, during the amplitude adjustment process, the magnetic sensor is used to sense the magnetic part to obtain the current position of the slider, and the current actual amplitude is calculated from the slider position, the actual amplitude is compared with the theoretical amplitude currently corresponding to the adjustment mechanism, and the theoretical amplitude is corrected, thereby correcting the amplitude adjustment error caused by the adjustment mechanism or the driving mechanism, thereby improving the amplitude control accuracy and massage effect of the fascia gun; in addition, the system can convert the actual amplitude determined according to the slider position into a display signal, and send it to the display module of the fascia gun, thereby displaying the real-time amplitude, which is convenient for users to adjust the amplitude intuitively; in addition, the magnetic sensor is used to obtain the real-time position of the slider, and the driving mechanism can be controlled to stop or reverse when the slider is about to reach its limit position of movement, so as to avoid structural damage or mechanical failure caused by the slider exceeding the movement range, thereby increasing the safety of amplitude adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the amplitude changing mechanism and the regulating mechanism of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the driving mechanism and the regulating mechanism of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the control mechanism of the utility model.

[0018] Marked in the figure are, 1-amplitude changing mechanism, 2-adjusting mechanism, 3-driving mechanism, 4-control mechanism, 5-magnetic sensor, 6-control main board, 7-motor bracket, 8-fascia gun housing, 11-amplitude adjusting rod, 21-slider, 22-magnetic part, 23-bracket, 24-screw rod, 25-guide slide rod, 31-adjusting motor, 32-reduction gear, 41-housing bracket, 42-knob cover, 43-rotary encoder switch, 44-panel, 45-LED lamp, 46-digital tube, 47-control button, 48-button, 49-dustproof sealing ring, 51-detection circuit board. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings.

[0020] It should be noted that if there are directional indication terms in the present invention, such as up, down, left, right, front, and back directions and orientation terms, they are for the purpose of facilitating the description of the relative position relationship between components, and are not for the absolute position of the related components or the position relationship between components. They are only used to explain the relative position relationship and movement of the components in a certain posture. If the specific posture changes, the directional indication will also change accordingly. If there are terms related to quantity in the present invention, such as "multiple", "multiple", "several", etc., they specifically refer to two or more.

[0021] like Figure 1 , Figure 2 As shown, the utility model provides a fascia gun amplitude adjustment mechanism with a magnetic sensor, including an amplitude change mechanism 1 and an adjustment mechanism 2, wherein the adjustment end of the amplitude adjustment rod 11 in the amplitude change mechanism 1 is hinged to the slider 21 in the adjustment mechanism 2, and the slider 21 moves linearly under the drive of the driving mechanism 3, and also includes a magnetic sensor 5, a magnetic part 22 arranged on the slider 21, and a control main board 6, wherein the magnetic sensor 5 is used to detect the magnetic field strength or magnetic field direction of the magnetic part 22 to obtain the position information of the slider 21; the control main board 6 is electrically connected to the magnetic sensor 5 and obtains the position information of the slider 21 in real time, and the control main board 6 controls the start and stop of the driving mechanism 3 based on the position information of the slider 21.

[0022] The amplitude changing mechanism 1 has been disclosed in the patent document with the publication number CN116155027A. The specific amplitude adjustment principle will not be repeated here. The adjustment method is to drive the slider 21 to move along a straight line on the adjustment mechanism 2 through the driving mechanism 3, and the slider 21 then drives the amplitude adjustment rod 11 to move, and finally realize the amplitude adjustment. The improvement of the utility model is that a magnetic sensor 5 and a magnetic part 22 are added. The magnetic sensor 5 is fixed at a certain position in the fascia gun housing, and the magnetic part 22 is installed on the slider 21. When the slider 21 moves, the magnetic field strength and magnetic field direction of the magnetic part 22 at the position of the magnetic sensor 5 will change. The magnetic sensor 5 used in this application is a sensor chip with a signal transmission function commonly used in the prior art, which can transmit the magnetic field strength or magnetic field direction information sensed by it to the control mainboard 6. The control mainboard 6 stores the corresponding relationship between the position information of the slider 21 and the magnetic field strength or magnetic field direction, so the control mainboard 6 can obtain the current position of the slider 21 through the magnetic sensor 5. In addition, the control mainboard 6 also stores the correspondence between the position information of the slider 21 and the amplitude, so the system can know the actual amplitude under the current working state. When the adjustment mechanism 2 is designed, there will be a correspondence between the adjustment position of the slider 21 and the theoretical amplitude. When the system finds that the actual amplitude is inconsistent with the theoretical amplitude through comparison, the theoretical amplitude corresponding to the current position of the slider 21 can be adjusted according to the actual amplitude, or the drive mechanism 3 can be controlled to start and stop according to the theoretical amplitude to drive the slider 21 to move so that its actual amplitude reaches the theoretical amplitude, thereby achieving the correction of the amplitude adjustment error caused by the adjustment mechanism or the drive mechanism. Of course, it is not limited to the adjustment mechanism disclosed in CN116155027A. There are many other types of amplitude adjustment mechanisms in the prior art. As long as the adjustment mechanism relies on the movement or rotation of the slider to adjust the amplitude, the above-mentioned method of adding magnetic sensors and magnetic parts can be used to correct the adjustment error.

[0023] As for the setting position of the magnetic sensor 5, in theory, it can be installed at any position close to the slider 21. Considering the limited internal space of the fascia gun, the magnetic sensor 5 can be set on the detection circuit board 51 on the bracket 23 of the adjustment mechanism 2, and the detection circuit board 51 is electrically connected to the control main board 6. The detection circuit board 51 is used as a fixing base for the magnetic sensor 5 on the one hand, and also supplies power to it and transmits information to the control main board 6 on the other hand. The detection circuit board 51 can be set at one end of the bracket 23 and located on the moving path of the slider 21, such as Figure 2 As shown, in this way, the slider 21 will not be at the same distance from the magnetic sensor 5 during the movement, thereby ensuring that the magnetic sensor 5 can know the accurate position of the slider 21.

[0024] The most common way for the magnetic member 22 is to use a permanent magnet and embed it on the slider 21. In addition, the slider 21 can also be made directly of magnetic materials, such as aluminum nickel cobalt, iron chromium cobalt or neodymium iron boron.

[0025] Regarding the structural form of the adjustment mechanism 2 and the drive mechanism 3, since the screw nut transmission mechanism operates smoothly, is easy to adjust and has high adjustment accuracy, the utility model still prefers the screw nut transmission mechanism as the adjustment mechanism 2, and the corresponding drive mechanism 3 is driven by a motor. Figure 1 , Figure 2 As shown, the adjustment mechanism 2 includes a bracket 23, a screw rod 24 and a guide slide rod 25 installed on the bracket 23, the screw rod 24 is rotatably arranged on the bracket 23 at both ends, the guide slide rod 25 is parallel to the screw rod 24 and fixed on the bracket 23 at both ends, the slider 21 is threadedly connected with the screw rod 24, and is slidably connected with the guide slide rod 25, and the drive mechanism 3 includes an adjustment motor 31 and a reduction gear 32 installed on the bracket 23, and the adjustment motor 31 drives the screw rod 24 to rotate through the reduction gear 32. Among them, the bracket 23 is preferably an integrally formed structure with the motor bracket 7 of the fascia gun to improve the stability of the structure and to make it easier to control the installation accuracy between various components. In addition, the guide slide rod 25 preferably includes two, which are symmetrically arranged on both sides of the screw rod 24, so that when the screw rod 24 rotates forward or reversely, the guide slide rod 25 can play a good supporting and guiding role. In the amplitude adjustment process, the start and stop of the drive mechanism 3 is mainly driven by controlling the forward or reverse rotation of the adjustment motor 31 for a specific time or a specific number of turns to drive the slider 21 to move and stop. Different from the prior art CN116155027A, the prior art uses the cooperation between the slide groove and the slider to limit the rotation of the slider. In actual use, the friction between the slider and the slide groove is large, which will produce relatively large noise. The utility model uses the sliding cooperation between the guide slide bar 25 and the slider 21 to guide, which can reduce friction and noise.

[0026] There is another problem in the prior art CN116155027A, that is, when the cumulative error between the slider 21 and the screw 24 increases, before the adjustment mechanism reaches the limit position, the slider 21 may have hit the two ends of the bracket, or the slider 21 may be stuck on the screw 24, thereby causing structural damage or mechanical failure, resulting in the inability of the adjustment mechanism to work. On the other hand, the screw 24 is used for transmission in a small space of the fascia gun product. The size of the screw 24 is very small, and it is difficult to use a trapezoidal thread like that used on a machine tool screw, and the strength of the standard thread is lower than that of the trapezoidal thread. When the fascia gun adjusts the amplitude during the massage process, the screw 24 generally needs to provide a force of more than 100N to the slider 21. When the slider 21 moves to the limit position at both ends of the screw 24, if the slider 21 cannot stop in time, the slider 21 collides with the brackets at both ends under a large force and stops suddenly, which will cause the impact force to increase instantly, and it is very easy to break through the strength limit of the metal material of the screw and cause damage, so it is necessary to detect the position of the slider to avoid the situation of being stuck and damaged. In order to solve the above problems, after adding the magnetic sensor 5 and the magnetic part 22, the utility model can electrically connect the adjusting motor 31 to the control main board 6, and is configured so that when the magnetic sensor 5 detects that the slider 21 moves to the two ends of the bracket 23, the adjusting motor 31 stops working or reverses to a specific angle. In this way, a safety function can be added to avoid the collision between the slider 21 and the bracket 23, or the situation where the slider 21 and the screw 24 are stuck. Among them, the specific control program is the existing technology, and the general principle can be to first set a threshold range, and the two endpoints of the threshold range are the magnetic field strength corresponding to when the slider 21 is close to the two ends of the bracket 23. When the magnetic field strength detected by the magnetic sensor reaches the two endpoints of the threshold range, a signal is sent to the control main board 6, and then the control main board 6 controls the adjusting motor 31 to stop working or reverse to a specific angle.

[0027] like Figure 3As shown, in order to better control the rotation of the adjustment motor 31 and realize the intuitive adjustment of the amplitude, the utility model is also provided with a control mechanism 4, which includes a shell bracket 41 fixedly connected to the fascia gun housing 8, and a knob cover 42 rotatably arranged on the shell bracket 41, and a rotary encoder switch 43 is arranged in the shell bracket 41, and the knob cover 42 is connected to the knob of the rotary encoder switch 43, and the rotary encoder switch 43 is electrically connected to the control main board 6. The rotary encoder switch 43 is an existing product, which can send different electrical signals by rotating the knob, thereby controlling the rotation of the adjustment motor 31. Since the adjustment mechanism 2 is arranged on the side opposite to the piston rod of the fascia gun, the control mechanism 4 can be arranged at the rear end of the fascia gun, closer to the adjustment structure 2 and the drive mechanism 3. The working process of the control mechanism 4 is that when the amplitude needs to be adjusted, the knob cover 42 is rotated, and the knob cover 42 drives the rotary encoder switch 43 to rotate, and the rotary encoder switch 43 transmits the adjustment signal to the control main board 6. The control main board 6 then controls the adjustment motor 31 to rotate forward or reverse a specific number of circles or work for a specific length of time, so that the slider 21 moves to the set position, thereby adjusting the amplitude of the amplitude adjustment mechanism 1 to the set value through the amplitude adjustment rod 11.

[0028] In order to improve the compactness of the structure and better control the fascia gun, the control main board 6 can be set in the shell bracket 41, and the knob cover 42 is a ring structure, in which a panel 44 fixedly connected to the shell bracket 41 is provided, and a digital tube 46 corresponding to the LED light 45 on the control main board 6 is provided in the panel 44, and a button 48 corresponding to the control button 47 on the control main board 6 is provided on the panel 44, and a dustproof seal 49 is provided between the knob cover 42 and the shell bracket 41. The control main board 6 converts the amplitude corresponding to the current position of the slider 21 into an electrical signal, and controls the LED light 45 to turn on and off, so as to display the current amplitude through the digital tube 46. The knob cover 42 and the shell bracket 41 can be rotatably connected by the matching form of a buckle and a snap ring. Since there is a clearance fit between the two, the dustproof seal 49 can be added to prevent external dust from entering the fascia gun shell. In addition, since the control main board 6 is arranged near the adjustment mechanism 2, in order to simplify the structure, the magnetic sensor 5 can be directly arranged on the control main board 6, and the magnetic member 22 can be arranged on the side of the slider 21 facing the control main board 6. In this way, one detection circuit board 51 can be reduced, making the structure more compact.

Claims

1. A fascia gun amplitude adjustment mechanism with a magnetic sensor, comprising an amplitude change mechanism (1) and an adjustment mechanism (2), wherein the adjustment end of the amplitude adjustment rod (11) in the amplitude change mechanism (1) is hinged to a slider (21) in the adjustment mechanism (2), and the slider (21) moves linearly under the drive of a driving mechanism (3), characterized in that: It also comprises a magnetic sensor (5), a magnetic part (22) arranged on a slider (21), and a control mainboard (6); the magnetic sensor (5) is used to detect the magnetic field strength or magnetic field direction of the magnetic part (22) to obtain position information of the slider (21); the control mainboard (6) is electrically connected to the magnetic sensor (5) and obtains the position information of the slider (21) in real time; the control mainboard (6) controls the start and stop of the driving mechanism (3) based on the position information of the slider (21).

2. The fascia gun amplitude adjustment mechanism with a magnetic sensor as claimed in claim 1, characterized in that: The adjusting mechanism (2) further comprises a bracket (23), a screw rod (24) and a guide slide rod (25) mounted on the bracket (23); the screw rod (24) is rotatably arranged at both ends on the bracket (23); the guide slide rod (25) is parallel to the screw rod (24) and fixed at both ends on the bracket (23); the slider (21) is threadedly connected to the screw rod (24) and slidably connected to the guide slide rod (25); the driving mechanism (3) comprises an adjusting motor (31) and a reduction gear (32) mounted on the bracket (23); the adjusting motor (31) drives the screw rod (24) to rotate via the reduction gear (32).

3. The fascia gun amplitude adjustment mechanism with a magnetic sensor as claimed in claim 2, characterized in that: The regulating motor (31) is electrically connected to the control main board (6) and is configured such that when the magnetic sensor (5) detects that the slider (21) moves to the two ends adjacent to the bracket (23), the regulating motor (31) stops working or reverses to a specific angle.

4. The fascia gun amplitude adjustment mechanism with a magnetic sensor as claimed in claim 2, characterized in that: The bracket (23) and the motor bracket (7) of the fascia gun are an integrally formed structure.

5. The fascia gun amplitude adjustment mechanism with a magnetic sensor as claimed in claim 2, characterized in that: The guide sliding rods (25) include two, which are symmetrically arranged on both sides of the screw rod (24).

6. The fascia gun amplitude adjustment mechanism with a magnetic sensor as claimed in claim 2, characterized in that: The magnetic sensor (5) is arranged on a detection circuit board (51) on the bracket (23), and the detection circuit board (51) is electrically connected to the control main board (6).

7. The fascia gun amplitude adjustment mechanism with a magnetic sensor as claimed in claim 1, characterized in that: The magnetic component (22) is at least a part of the slider (21), and the slider (21) is made of a magnetic material; or the magnetic component (22) is a magnet embedded in the slider (21).

8. The fascia gun amplitude adjustment mechanism with a magnetic sensor as described in any one of claims 1 to 5, characterized in that: It also includes a control mechanism (4), which includes a shell bracket (41) fixedly connected to the fascia gun housing (8), and a knob cover (42) rotatably arranged on the shell bracket (41), a rotary encoder switch (43) is arranged in the shell bracket (41), the knob cover (42) is connected to the knob of the rotary encoder switch (43), and the rotary encoder switch (43) is electrically connected to the control main board (6).

9. The fascia gun amplitude adjustment mechanism with a magnetic sensor as claimed in claim 8, characterized in that: The control main board (6) is arranged in a housing bracket (41); the knob cover (42) is an annular structure, wherein a panel (44) fixedly connected to the housing bracket (41) is provided in the middle thereof; a digital tube (46) corresponding to an LED light (45) on the control main board (6) is provided in the panel (44); a button (48) corresponding to a control button (47) on the control main board (6) is provided on the panel (44); and a dustproof sealing ring (49) is provided between the knob cover (42) and the housing bracket (41).

10. The fascia gun amplitude adjustment mechanism with a magnetic sensor as claimed in claim 9, characterized in that: The magnetic sensor (5) is arranged on the control main board (6), and the magnetic member (22) is arranged on a side of the slider (21) facing the control main board (6).

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