Variable amplitude fascia gun

Abstract

This utility model discloses a variable amplitude fascia gun in the field of massage equipment. It includes a housing and a variable amplitude reciprocating motion mechanism located within the housing. The housing has a rotating cover for adjusting the amplitude of the reciprocating motion mechanism. A variable resistance control board is also fixedly installed inside the housing. A knob on the variable resistance control board is fixedly connected to the rotating cover. When the rotating cover is rotated to adjust the amplitude of the reciprocating motion mechanism, the knob rotates synchronously, causing the variable resistance control board to input different resistance values ​​to the controller built into the fascia gun. The controller obtains the amplitude of the reciprocating motion mechanism in the current state based on the resistance value or the correspondence between the rotation angle calculated from the resistance value and the amplitude of the reciprocating motion mechanism, and outputs it outward. This utility model uses the resistance change of the variable resistance control board to reflect the amplitude change of the fascia gun, which is intuitive and convenient. Furthermore, the variable resistance control board is smaller and simpler in structure than an encoder, making it suitable for compact small fascia guns.

Description

Technical Field

[0001] This utility model relates to the field of massage equipment, and in particular to a variable amplitude fascia gun. Background Technology

[0002] A fascia gun, also known as a deep myofascial release device, is a soft tissue massage tool. A fascia gun has a massage head and a reciprocating mechanism that drives the massage head in a linear reciprocating motion. The high-frequency vibrations generated by the massage head act on the deep layers of muscles, reducing local tissue tension, relieving pain, and promoting blood circulation. Beginners should initially use a fascia gun with a shallower vibration depth, gradually increasing the depth as needed. Therefore, fascia guns with adjustable vibration depth are becoming increasingly popular among consumers. Currently, many variable amplitude fascia guns are available on the market. Some can display the current amplitude, while others cannot. For example, patent document CN222721263U discloses an amplitude adjustment mechanism for a variable amplitude fascia gun, which can change the amplitude of the fascia gun through an eccentricity adjustment mechanism, but cannot display the current amplitude. Patent document CN222399456U discloses a synchronously indicating amplitude-adjusting reciprocating mechanism and fascia gun, which can obtain piston amplitude change data by detecting the rotation angle and number of rotations of the rotating part through an encoder. Since encoders are relatively large, they are difficult to integrate into some small fascia guns. Therefore, it is necessary to study an amplitude acquisition method suitable for small fascia guns. Utility Model Content

[0003] To overcome the shortcomings of existing methods that use encoders to obtain the amplitude of fascia guns, such as large space requirements, the technical problem to be solved by this utility model is to provide a variable amplitude fascia gun with a compact structure that can obtain the amplitude of the fascia gun.

[0004] The technical solution adopted by this utility model to solve its technical problem is: A variable amplitude fascia gun includes a housing and a variable amplitude reciprocating motion mechanism located within the housing. The housing has a rotating cap for adjusting the amplitude of the reciprocating motion mechanism. A variable resistance control board is also fixedly installed inside the housing. A knob on the variable resistance control board is fixedly connected to the rotating cap. When the rotating cap is rotated to adjust the amplitude of the reciprocating motion mechanism, the knob rotates synchronously, causing the variable resistance control board to input different resistance values ​​to the controller built into the fascia gun. The controller obtains the amplitude of the reciprocating motion mechanism in the current state based on the resistance value or the correspondence between the rotation angle calculated from the resistance value and the amplitude of the reciprocating motion mechanism, and outputs this value. The change in resistance value of the variable resistance control board is linearly related to the rotation angle of the knob, and the amplitude of the reciprocating motion mechanism is also linearly related to the rotation angle of the rotating cap. Therefore, the variable resistance control board can accurately reflect the amplitude of the fascia gun. Furthermore, the variable resistance control board is small in size and can be easily integrated into the rotating cap of existing fascia guns, occupying little space and suitable for small fascia guns.

[0005] To facilitate the installation of the variable resistor control board, the screw cap includes an outer frame and a connecting plate located inside the outer frame. A cover plate is provided at the end of the outer frame away from the housing. The cover plate is fixedly connected to the housing via a connector passing through the gap between the outer frame and the connecting plate. The main body of the variable resistor control board is fixed inside the cover plate, and the knob on the variable resistor control board is fixedly connected to the connecting plate. The connecting plate of the screw cap has a transmission mechanism for adjusting the amplitude, which makes it inconvenient to install the variable resistor control board. Therefore, by providing a cover plate on the outside of the connecting plate and placing the variable resistor control board inside the cover plate, the assembly difficulty is reduced, and later inspection and maintenance are facilitated.

[0006] The gap is an arc-shaped through groove between the outer frame and the connecting plate. The connector consists of at least two positioning posts on the housing that pass through the arc-shaped through groove. The cover plate is connected to the positioning posts by snaps or screws. The rotation range of the cap is limited by the contact between the positioning posts and the end of the arc-shaped through groove. The positioning posts provide a mounting base for the cover plate and also cooperate smoothly with the arc to limit the rotation of the cap, preventing damage to components due to excessive rotation of the cap and knob.

[0007] To avoid interference between the wires connected to the variable resistor control board and the rotation of the cap, a wire guide groove is provided on the outside of the positioning post, which extends into the housing. The wires on the variable resistor control board pass through the wire guide groove and are electrically connected to the controller built into the fascia gun.

[0008] The housing is equipped with an ambient light strip, which is connected in series in the wire between the variable resistor control board and the controller. The ambient light strip changes color according to the resistance change of the variable resistor control board. The ambient light strip allows users to intuitively understand the current amplitude and easily select the appropriate amplitude.

[0009] For the reciprocating motion mechanism, the preferred embodiment of this utility model is that the reciprocating motion mechanism includes a motor mounted vertically on a support and a piston rod slidably mounted horizontally within a sleeve. The upper end of the motor is connected to the cap via a transmission mechanism, and an adjustable eccentric wheel is provided on the lower shaft of the motor. The adjustable eccentric wheel includes a guide block and a sliding block. The guide block, coaxial with the motor, is rotatably mounted on the support and has a horizontal groove in its middle. The sliding block is slidably mounted in the groove, and the upper end of the sliding block is slidably connected to the inclined guide groove on the shaft via an inclined guide rail. The lower end of the sliding block is hinged to the piston rod via a transmission arm. When the cap rotates, the transmission mechanism can drive the motor or the motor shaft to move up and down, and with the cooperation of the inclined guide rail and the inclined guide groove, the sliding block slides horizontally, changing the horizontal distance between the sliding block and the motor shaft. The screw cap drives the motor or motor shaft to move up and down, and then the sliding block slides horizontally on the guide block through the inclined plane. This sliding process is the eccentricity adjustment process of the crank-slider mechanism. By adjusting the eccentricity, the reciprocating stroke of the crank-slider mechanism can be adjusted, thereby changing the amplitude of the fascia gun.

[0010] The bracket includes a sleeve arranged vertically. The stator of the motor is fixed around the sleeve. A first bearing is located inside the upper and lower ends of the sleeve. The motor shaft slides through the two first bearings. The upper end of the shaft is rotatably connected to the transmission mechanism, and the outer wall of the upper end of the shaft is fixedly connected to the rotor. The rotor is mounted around the stator. The guide block of the adjustable eccentric wheel is rotatably mounted inside the bracket below the sleeve via a second bearing. By fixing the stator, the heaviest component of the motor, to the bracket, and adjusting the position of the sliding block on the guide block by only moving the motor shaft up and down, the force required for adjustment is reduced, and the structure of the transmission mechanism is simplified.

[0011] The transmission mechanism includes an external threaded sleeve and an internal threaded sleeve. The external threaded sleeve is slidably mounted on the top of the housing in a vertical direction. The upper end of the motor shaft is rotatably connected to the external threaded sleeve via a third bearing. The upper end of the internal threaded sleeve is fixedly connected to the connecting plate of the cap, and the lower end is threadedly connected to the external threaded sleeve. The threaded engagement structure converts the rotation of the cap into the up-and-down movement of the external threaded sleeve, thereby achieving up-and-down adjustment of the motor shaft and improving the accuracy of amplitude adjustment.

[0012] To enable the external threaded sleeve to slide up and down, at least two guide bars are provided vertically on the inner side of the top of the housing. The outer wall of the external threaded sleeve is provided with a guide groove that slides with the guide bars. The interior of the external threaded sleeve is provided with a stepped surface. The outer ring of the third bearing is fixed to the stepped surface by screws. The upper end of the rotating shaft is fixedly connected to the inner ring of the third bearing by screws.

[0013] The top periphery of the housing is provided with an inwardly folded limiting ring. The outer frame of the cap is rotatably connected to the outer wall of the top of the housing. A silicone ring is provided between the lower end of the outer frame and the positioning step on the surface of the housing. A positioning ring is provided on the outer wall of the internally threaded sleeve. The connecting plate of the internally threaded sleeve and the cap is connected by screws, so that the upper surface of the positioning ring abuts against the lower surface of the limiting ring, and the silicone ring is pressed between the outer frame and the positioning step. Through the upper and lower limiting, the stable rotational connection between the cap and the internally threaded sleeve and the housing can be ensured, and the damped rotation of the cap can be achieved through the silicone ring, thereby improving the experience of adjusting the amplitude through the cap.

[0014] The beneficial effects of this utility model are: by setting a variable resistor control board inside the housing and fixing the knob of the variable resistor control board to the screw cap for adjusting the amplitude of the fascia gun, the resistance value of the variable resistor can be adjusted simultaneously when the screw cap is rotated to adjust the amplitude, thereby obtaining the amplitude of the fascia gun according to the change in resistance value; in addition, the variable resistor control board is smaller in size and simpler in structure than the encoder, and is suitable for compact small fascia guns. Attached Figure Description

[0015] Figure 1 This is an exploded view of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a top view of the present invention; Figure 4 This is a schematic diagram of the structure of the shell of this utility model; Figure 5 This is an exploded view of the reciprocating motion mechanism of this utility model; Figure 6 This is an exploded view of the adjustable eccentric wheel of this utility model.

[0016] The components in the diagram are labeled as follows: 1-House, 2-Screw cap, 3-Variable resistor control board, 4-Cover plate, 5-Bracket, 6-Motor, 7-Piston rod, 8-Adjustable eccentric wheel, 9-Transmission arm, 11-Positioning column, 12-Wire groove, 13-Ambient light strip, 14-Guide strip, 15-Limit ring, 16-Silicone ring, 17-Positioning step, 18-Guide cylinder, 21-Outer frame, 22-Connecting plate, 23-Circular arc groove, 24-External threaded sleeve, 25-Internal threaded sleeve, 26-Guide groove, 27-Positioning ring, 31-Knob, 41-Snap fastener, 51-Sleeve, 52-First bearing, 53-Second bearing, 54-Third bearing, 61-Shaft, 62-Angled guide groove, 63-Stator, 64-Rotor, 81-Guide block, 82-Sliding block, 83-Slide groove, 84-Angled guide rail. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] It should be noted that if this utility model contains directional indicators such as up, down, left, right, front, and back, these terms are used to describe the relative positional relationships between components and are not specific references to the absolute positions of the components or the relationships between them. They are only used to explain the relative positional relationships and movement of the components in a specific posture. If the specific posture changes, the directional indicator will also change accordingly. If this utility model contains terms related to quantity such as "many," "multiple," or "several," these terms specifically refer to two or more.

[0019] like Figure 1 , Figure 2 As shown, the present invention provides a variable amplitude fascia gun, including a housing 1 and a variable amplitude reciprocating motion mechanism located inside the housing 1. The housing 1 is provided with a rotating cover 2 for adjusting the amplitude of the reciprocating motion mechanism. A variable resistance control plate 3 is also fixedly installed inside the housing 1. A knob 31 on the variable resistance control plate 3 is fixedly connected to the rotating cover 2. When the rotating cover 2 is rotated to adjust the amplitude of the reciprocating motion mechanism, the knob 31 rotates synchronously, so that the variable resistance control plate 3 inputs different resistance values ​​to the controller built into the fascia gun. The controller obtains the amplitude of the reciprocating motion mechanism in the current state and outputs it outward based on the correspondence between the resistance value or the rotation angle calculated from the resistance value and the amplitude of the reciprocating motion mechanism.

[0020] Currently, many fascia guns adjust amplitude by rotating a cap. Therefore, the rotation angle of the cap 2 has a linear relationship with the amplitude, and the amplitude of the reciprocating mechanism can be determined by obtaining the rotation angle of the cap 2. Most fascia guns currently use encoders to obtain the rotation angle of the cap 2, but encoders are bulky and unsuitable for smaller fascia guns. Therefore, this invention uses a variable resistance control board 3 to replace the encoder. The variable resistance control board 3 is an existing component with a knob 31. Rotating the knob 31 changes the resistance value of the variable resistance control board 3. It is connected to the controller built into the fascia gun via wires. The controller can identify the resistance value of the variable resistance control board 3 according to its built-in program, similar to the principle of an ohmmeter, and can also deduce the angle rotated by the knob 31 from the resistance value. Furthermore, the controller also has a built-in correspondence between resistance value and amplitude, or between the angle rotated by the cap 2 and the amplitude. This correspondence is obtained from previous experimental data and built into the controller's program. Therefore, the amplitude of the reciprocating motion mechanism in the current state can be obtained through the variable resistor control board 3, and then the amplitude information can be displayed on the display screen of the fascia gun, or transmitted to a mobile APP or mini program for display through the wireless delivery module.

[0021] The screw cap 2 is generally located at the end of the housing 1. To facilitate fixing the variable resistor control board 3 to the housing 1, the preferred embodiment adopted in this invention is as follows: Figure 1 , Figure 2 As shown, the screw cap 2 includes an outer frame 21 and a connecting plate 22 located inside the outer frame 21. A cover plate 4 is provided at the end of the outer frame 21 away from the housing 1. The cover plate 4 is fixedly connected to the housing 1 via a connector passing through the gap between the outer frame 21 and the connecting plate 22. The main body of the variable resistor control board 3 is fixed inside the cover plate 4, and the knob 31 on the variable resistor control board 3 is fixedly connected to the connecting plate 22. The gap between the outer frame 21 and the connecting plate 22 should ensure that the connector does not interfere with the connecting plate 22 when the screw cap 2 is rotated. To save space, the variable resistor control board 3 can be fixed inside the cover plate 4 by adhesive bonding. The end of the knob 31 can be flattened and inserted into a socket on the surface of the connecting plate 22 to achieve synchronous rotation with the connecting plate 22.

[0022] like Figure 3 As shown, to accommodate the rotation of the cap 2, the gap is preferably an arc-shaped through groove 23 between the outer frame 21 and the connecting plate 22. The connector consists of at least two positioning posts 11 mounted on the housing 1 and passing through the arc-shaped through groove 23. The cover plate 4 is connected to the positioning posts 11 by a snap fastener 41 or screws. The cap 2 limits its rotation range by contact between the positioning posts 11 and the ends of the arc-shaped through groove 23. The arc length of the arc-shaped through groove 23 is set according to the rotation range of the cap 2. Figure 3 In the example shown, the cap 2 needs to rotate approximately 135°, so only two positioning posts 11 can be symmetrically arranged. In addition to the two symmetrical arc-shaped through slots 23, the rest of the cap 2 serves as a connecting part to connect the outer frame 21 and the connecting plate 22. To facilitate assembly, a snap-fit ​​can be made at the top of the positioning post 11, and a buckle 41 can be provided on the inside of the cover plate 4 to snap the cover plate 4 onto the positioning post 11.

[0023] Since the variable resistor control board 3 needs to be connected to the controller via wires, and the rotating cap 2 may interfere with the wires when it rotates, a further solution is, as follows: Figure 4 As shown, a wire passage groove 12 is provided on the outer side of the positioning post 11, extending inward into the housing 1. The wires on the variable resistor control board 3 pass through the wire passage groove 12 and are electrically connected to the controller built into the fascia gun. Because the positioning post 11 and the variable resistor control board 3 are fixed, the wires located in the wire passage groove 12 on the positioning post 11 will not interfere with the screw cap 2.

[0024] To facilitate intuitive understanding of the current amplitude for users, this invention also includes an ambient light strip 13 on the housing 1. The ambient light strip 13 is connected in series with the wire between the variable resistor control board 3 and the controller. The ambient light strip 13 changes color according to the resistance change of the variable resistor control board 3. The ambient light strip 13 can be located on the outside or inside of the housing 1. If located on the outside, a through hole is required for the wire to pass through; if located inside, a light-transmitting hole needs to be provided on the housing 1, or the housing 1 near the ambient light strip 13 needs to be made of a light-transmitting material. The color of the ambient light strip 13 corresponds to the amplitude; for example, a lighter color for low amplitude and a darker color for high amplitude, allowing users to select the appropriate amplitude based on the light color.

[0025] For the specific structure of reciprocating motion mechanisms with variable amplitude, there are many existing technologies that can change the amplitude, and their core principle is to change the eccentricity of the crank-slider mechanism. This utility model provides an embodiment, such as... Figure 5 , Figure 6 As shown, the reciprocating motion mechanism includes a motor 6 vertically mounted on a support 5 and a piston rod 7 horizontally slidably mounted within a guide cylinder 18. Both the support 5 and the guide cylinder 18 are fixed within the housing 1. The upper end of the motor 6 is connected to the cap 2 via a transmission mechanism. An adjustable eccentric wheel 8 is mounted on the lower shaft 61 of the motor 6. The adjustable eccentric wheel 8 includes a guide block 81 and a sliding block 82. The guide block 81, coaxial with the motor 6, is rotatably mounted on the support 5, and its central portion has a horizontal sliding groove 83. The groove 83 is arranged radially along the guide block 81. The sliding block 82 is slidably disposed within the groove 83. The upper end of the sliding block 82 is slidably connected to the inclined guide groove 62 on the rotating shaft 61 via the inclined guide rail 84, and the lower end is hinged to the piston rod 7 via the transmission arm 9. When the cap 2 rotates, it can drive the motor 6 or the rotating shaft 61 of the motor 6 to move up and down through the transmission mechanism. With the cooperation of the inclined guide rail 84 and the inclined guide groove 62, the sliding block 82 slides in the horizontal direction, changing the horizontal distance between the sliding block 82 and the rotating shaft 61 of the motor 6. The amplitude adjustment process of this utility model mainly changes the position of the sliding block 82 on the guide block 81. Since the guide block 81 rotates coaxially with the motor 6, and the sliding block 82 is hinged to the piston rod 7 via the transmission arm 9, changing the position of the sliding block 82 on the guide block 81 is to adjust the eccentricity of the adjustable eccentric wheel 8, thereby realizing the adjustment of the striking distance of the piston rod 7. The adjustment of the sliding block 82 is achieved by the up-and-down movement of the motor 6 or the rotating shaft 61 of the motor 6. The inclined guide groove 62 can be a dovetail groove or a T-shaped groove that cooperates with the corresponding inclined guide rail 84, that is, the two can slide relative to each other, but cannot disengage. This cooperation structure can convert the up-and-down movement of the motor 6 or the rotating shaft 61 into the horizontal movement of the sliding block 82 along the sliding groove 83. The up-and-down movement of the motor 6 or the rotating shaft 61 is achieved through the screw cap 2 and the transmission mechanism, thereby realizing the amplitude adjustment of the reciprocating motion mechanism.

[0026] Because motor 6 is relatively heavy, moving the entire motor 6 vertically would require sliding it onto bracket 5, which would affect its rotational stability and place higher demands on the transmission mechanism for securing motor 6. Therefore, the preferred solution is to move only the shaft 61 of motor 6. The specific implementation is as follows... Figure 2 , Figure 5 As shown, the bracket 5 includes a sleeve 51 arranged vertically. The stator 63 of the motor 6 is fixed to the outer periphery of the sleeve 51. A first bearing 52 is provided inside each of the upper and lower ends of the sleeve 51. The rotating shaft 61 of the motor 6 slides through the two first bearings 52. The upper end of the rotating shaft 61 is rotatably connected to the transmission mechanism, and the outer wall of the upper end of the rotating shaft 61 is fixedly connected to the rotor 64. The rotor 64 is encased around the stator 63. The guide block 81 of the adjustable eccentric wheel 8 is rotatably mounted inside the bracket 5 below the sleeve 51 via a second bearing 53. The bracket 5 is preferably made of metal to ensure the stability of the reciprocating motion mechanism. By fixing the stator, which has the heaviest mass in the motor 6, to the sleeve 51, the rotor 64 and rotating shaft 61 are relatively light, allowing for easy vertical movement without affecting the rotor 64's ability to drive the rotating shaft 61 to rotate. The first bearing 52 is fixed inside the sleeve 51 by the outer ring. The fitting accuracy between the rotating shaft 61 and the inner ring of the first bearing 52 is required to ensure that the rotating shaft 61 can slide smoothly, but there cannot be too large a gap, otherwise the rotating shaft 61 will shake and affect the stability of the motor 6 rotation.

[0027] The transmission mechanism primarily converts the rotational motion of the cap 2 into the up-and-down movement of the shaft 61 of the motor 5, while not restricting the rotation of the shaft 61. A preferred embodiment of this invention is as follows: Figure 2 As shown, the transmission mechanism includes an external threaded sleeve 24 and an internal threaded sleeve 25. The external threaded sleeve 24 is slidably mounted on the top of the housing 1 in a vertical direction. The upper end of the rotating shaft 61 of the motor 6 is rotatably connected to the external threaded sleeve 24 via a third bearing 54. The upper end of the internal threaded sleeve 25 is fixedly connected to the connecting plate 22 of the cap 2, and the lower end is threadedly connected to the external threaded sleeve 24. When the cap 2 is rotated, the internal threaded sleeve 25 rotates synchronously. Because the external threaded sleeve 24 is slidably mounted on the housing 1 in a vertical direction, the internal threaded sleeve 25 causes the external threaded sleeve 24 to move up and down, thereby driving the rotating shaft 61 connected to it to move up and down. The third bearing 54 ensures that the up and down movement of the external threaded sleeve 24 and the rotating shaft 61 does not affect the rotation of the rotating shaft 61.

[0028] To achieve sliding installation of the external threaded sleeve 24, such as Figure 4 As shown, at least two guide strips 14 are provided vertically on the inner side of the top of the housing 1, such as... Figure 6As shown, the outer wall of the external threaded sleeve 24 is provided with a guide groove 26 that slides with the guide bar 14. By aligning the guide groove 26 with the guide bar 14, the external threaded sleeve 24 can be vertically slidably installed. Figure 2 As shown, in order to facilitate the connection between the external threaded sleeve 24 and the rotating shaft 61, a stepped surface is provided inside the external threaded sleeve 24. The outer ring of the third bearing 54 is mounted on the stepped surface by screws, and the upper end of the rotating shaft 61 is fixedly connected to the inner ring of the third bearing 54 by screws.

[0029] like Figure 2 As shown, to facilitate the installation of the cap 2 and increase the damping effect of the cap 2's rotation to ensure the accuracy of amplitude adjustment, an inwardly folded limiting ring 15 is provided around the top periphery of the housing 1. The outer frame 21 of the cap 2 is rotatably connected to the outer wall of the top of the housing 1. A silicone ring 16 is provided between the lower end of the outer frame 21 and the positioning step 17 on the surface of the housing 1. A positioning ring 27 is provided on the outer wall of the internally threaded sleeve 25. The internally threaded sleeve 25 is connected to the connecting plate 22 of the cap 2 by screws. The tension of the screws causes the upper surface of the positioning ring 27 to abut against the lower surface of the limiting ring 15, so that the cap 2 presses the silicone ring 16 tightly between the outer frame 21 and the positioning step 17. In this way, through upper and lower limiting, the rotational connection between the entire cap 2 and the housing is ensured, and the damped rotation of the cap 2 is achieved through the silicone ring 16, thereby improving the experience of adjusting the amplitude through the cap 2.

Claims

1. A variable amplitude fascia gun, comprising a housing (1) and a variable amplitude reciprocating motion mechanism located within the housing (1), wherein the housing (1) is provided with a cap (2) for adjusting the amplitude of the reciprocating motion mechanism, characterized in that: A variable resistance control board (3) is also fixedly installed inside the housing (1). The knob (31) on the variable resistance control board (3) is fixedly connected to the cover (2). When the cover (2) is rotated to adjust the amplitude of the reciprocating motion mechanism, the knob (31) rotates synchronously, so that the variable resistance control board (3) inputs different resistance values ​​to the controller built into the fascia gun. The controller obtains the amplitude of the reciprocating motion mechanism in the current state and outputs it outward based on the correspondence between the resistance value or the rotation angle obtained by converting the resistance value and the amplitude of the reciprocating motion mechanism.

2. The variable amplitude fascia gun of claim 1, wherein: The screw cap (2) includes an outer frame (21) and a connecting plate (22) located inside the outer frame (21). A cover plate (4) is provided at one end of the outer frame (21) away from the housing (1). The cover plate (4) is fixedly connected to the housing (1) through a connector that passes through the gap between the outer frame (21) and the connecting plate (22). The main body of the variable resistor control board (3) is fixed inside the cover plate (4). The knob (31) on the variable resistor control board (3) is fixedly connected to the connecting plate (22).

3. The variable amplitude fascia gun of claim 2, wherein: The gap is an arc-shaped through groove (23) between the outer frame (21) and the connecting plate (22). The connector is at least two positioning posts (11) set on the housing (1) and passing through the arc-shaped through groove (23). The cover plate (4) is connected to the positioning posts (11) by a buckle (41) or a screw. The rotating cap (2) limits the rotation range by the contact between the positioning posts (11) and the end of the arc-shaped through groove (23).

4. The variable amplitude fascia gun of claim 3, wherein: The outer side of the positioning post (11) is provided with a wire groove (12) that extends into the housing (1). The wires on the variable resistor control board (3) pass through the wire groove (12) and are electrically connected to the controller built into the fascia gun.

5. The variable amplitude fascia gun of claim 4, wherein: The housing (1) is provided with an ambient light strip (13), which is connected in series on the wire between the variable resistor control board (3) and the controller. The ambient light strip (13) changes color according to the resistance change of the variable resistor control board (3).

6. The variable amplitude fascia gun of any one of claims 2-5, wherein: The reciprocating motion mechanism includes a motor (6) mounted vertically on a bracket (5) and a piston rod (7) slidably mounted horizontally within a guide cylinder (18). The upper end of the motor (6) is connected to the cap (2) via a transmission mechanism. An adjustable eccentric wheel (8) is mounted on the lower shaft (61) of the motor (6). The adjustable eccentric wheel (8) includes a guide block (81) and a sliding block (82). The guide block (81), coaxial with the motor (6), is rotatably mounted on the bracket (5), and has a horizontal groove (83) in its middle. The sliding block (82) The sliding block (82) is slidably set in the slide groove (83). The upper end of the sliding block (82) is slidably connected to the inclined guide groove (62) on the rotating shaft (61) through the inclined guide rail (84), and the lower end is hinged to the piston rod (7) through the transmission arm (9). When the cover (2) rotates, it can drive the motor (6) or the rotating shaft (61) of the motor (6) to move up and down through the transmission mechanism. With the cooperation of the inclined guide rail (84) and the inclined guide groove (62), the sliding block (82) slides in the horizontal direction, changing the horizontal distance between the sliding block (82) and the rotating shaft (61) of the motor (6).

7. The variable amplitude fascia gun of claim 6, wherein: The bracket (5) includes a sleeve (51) arranged in a vertical direction. The stator (63) of the motor (6) is fixed on the periphery of the sleeve (51). A first bearing (52) is provided inside the upper and lower ends of the sleeve (51). The rotating shaft (61) of the motor (6) slides through the two first bearings (52). The upper end of the rotating shaft (61) is rotatably connected to the transmission mechanism. The outer wall of the upper end of the rotating shaft (61) is fixedly connected to the rotor (64). The rotor (64) is covered on the periphery of the stator (63). The guide block (81) of the adjustable eccentric wheel (8) is rotatably arranged in the bracket (5) below the sleeve (51) through the second bearing (53).

8. The variable amplitude fascia gun of claim 7, wherein: The transmission mechanism includes an external threaded sleeve (24) and an internal threaded sleeve (25). The external threaded sleeve (24) is slidably disposed on the top of the housing (1) in the vertical direction. The upper end of the rotating shaft (61) of the motor (6) is rotatably connected to the external threaded sleeve (24) through a third bearing (54). The upper end of the internal threaded sleeve (25) is fixedly connected to the connecting plate (22) of the cap (2), and the lower end is threadedly connected to the external threaded sleeve (24).

9. The variable amplitude fascia gun of claim 8, wherein: The housing (1) has at least two guide strips (14) on the inner side of the top along the vertical direction. The outer wall of the external threaded sleeve (24) is provided with a guide groove (26) that is slidably connected to the guide strips (14). The interior of the external threaded sleeve (24) is provided with a stepped surface. The outer ring of the third bearing (54) is fixed to the stepped surface by screws. The upper end of the rotating shaft (61) is fixedly connected to the inner ring of the third bearing (54) by screws.

10. The variable amplitude fascia gun of claim 8, wherein: The top periphery of the housing (1) is provided with an inwardly folded limiting ring (15). The outer frame (21) of the screw cap (2) is rotatably connected to the top outer wall of the housing (1). A silicone ring (16) is provided between the lower end of the outer frame (21) and the positioning step (17) on the surface of the housing (1). A positioning ring (27) is provided on the outer wall of the internal threaded sleeve (25). The internal threaded sleeve (25) and the connecting plate (22) of the screw cap (2) are connected by screws, so that the upper surface of the positioning ring (27) abuts against the lower surface of the limiting ring (15) and presses the silicone ring (16) between the outer frame (21) and the positioning step (17).

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