Foam Roller with Variable Amplitude

Abstract

The present invention relates to the field of massage devices, in particular to a percussion massager with variable amplitude that realizes amplitude adjustment by switching the forward and reverse rotation states of a motor, comprising a motor, an eccentric distance adjustment assembly with an eccentric shaft, a connecting rod, and a piston rod. One end of the connecting rod is rotatably connected to the aforementioned eccentric shaft, and the other end of the connecting rod is rotatably connected to the piston rod. The eccentric distance adjustment assembly includes a sliding inclined block and an eccentric slider structure with an eccentric shaft. The motor output shaft of the motor is in threaded transmission connection with the sliding inclined block. The sliding inclined block slides on the eccentric slider structure under the drive of the motor and pushes the eccentric slider structure to move perpendicular to the direction of the motor output shaft. The present invention is applicable to the use occasions where the amplitude of the percussion massager is variable.

Description

Technical Field

[0001] The invention relates to the field of massage equipment, in particular to a fascia gun with variable amplitude. 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 perform reciprocating linear reciprocating motion through a massage drive mechanism. The massage head contacts the human body and generates high-frequency vibrations that act on the deep muscle layer, which reduces local tissue tension, relieves pain, and promotes blood circulation. The existing massage drive mechanism is mainly composed of a motor, an eccentric wheel arranged on the output end of the motor, a transmission arm hinged to the eccentric shaft of the eccentric wheel at one end, and a piston rod hinged to the other end of the transmission arm at the tail. During the operation of the fascia gun, the motor drives the eccentric wheel, the connecting rod, the piston rod and the massage head to form a striking massage mode, and its amplitude, that is, the striking distance, is determined by the eccentricity of the eccentric shaft on the eccentric wheel.

[0003] In order to adjust the eccentricity of the eccentric shaft, the patent application with application number US17524732 discloses a percussion massage device with adjustable stroke length, in which a slide groove is set on the eccentric wheel, and the eccentric shaft in the slide groove moves back and forth between two extreme positions through the forward and reverse rotation of the motor, so as to achieve different amplitudes during forward rotation and reverse rotation, thereby realizing the variable amplitude of the fascia gun. However, this amplitude conversion structure is unstable during high-speed movement, and the reason is that: at the highest point of the piston stroke, that is, when the motor rotates to the 180° position and the piston rod is fully extended to the top, if it is in a massage state, the piston rod will be subjected to the reaction force transmitted by the massage head to the human body, which will cause the slide rod to temporarily disengage from the slide groove, and the high-frequency collision of the slide rod in the slide groove will cause the product to vibrate and make noise, and the product's operating quality and stability are poor. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a fascia gun with variable amplitude which utilizes the switching of the forward and reverse rotation states of the motor to stably and reliably realize amplitude adjustment.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows: A fascia gun with variable amplitude, comprising a motor, an eccentric distance adjustment assembly with an eccentric shaft, a connecting rod, and a piston rod. One end of the connecting rod is rotatably connected to the aforementioned eccentric shaft, and the other end of the connecting rod is rotatably connected to the piston rod. The eccentric distance adjustment assembly includes a sliding inclined block and an eccentric slider structure with an eccentric shaft. The motor output shaft of the motor is in threaded transmission connection with the sliding inclined block. The sliding inclined block slides on the eccentric slider structure under the drive of the motor and pushes the eccentric slider structure to move perpendicular to the direction of the motor output shaft. This solution cleverly converts the rotational state of the motor output shaft into the movement of the sliding inclined block through a threaded transmission connection by constructing the linkage relationship among the motor output shaft, the sliding inclined block, and the eccentric slider structure. Subsequently, the movement of the sliding inclined block drives the eccentric slider structure to move perpendicular to the direction of the motor output shaft, thereby realizing the adjustment of the eccentric distance. Among them, by using two different rotational states of the motor, forward and reverse rotation, the sliding inclined block is driven in two different directions, and thus two different eccentric distances are realized.

[0006] To further optimize the structure and achieve the above-mentioned linkage function, it is preferably that the eccentric slider structure includes an eccentric wheel and an eccentric wheel slider. The eccentric wheel is rotatably connected to the motor output shaft, and a limit chute perpendicular to the direction of the motor output shaft is provided therein. The eccentric wheel slider is slidably connected to the limit chute. A sliding block inclined chute is provided at the bottom of the eccentric wheel slider, and the eccentric shaft is provided on the eccentric wheel slider. The sliding inclined block is slidably arranged in the sliding block inclined chute. The motor output shaft drives the sliding inclined block to slide along the aforementioned sliding block inclined chute and pushes the eccentric wheel slider to move along the aforementioned limit chute. During actual use, the motor output shaft drives the sliding inclined block to move. Since the sliding inclined block is arranged in the sliding block inclined chute of the eccentric wheel slider, when the sliding inclined block moves along the motor output shaft, the sliding inclined block also moves along the sliding block inclined chute. During this movement process, the sliding inclined block drives the eccentric wheel slider to move through the sliding block inclined chute, thereby realizing the adjustment of the eccentric distance. Such an improvement ensures that the sliding inclined block and the sliding block inclined chute are always in a tightly fitting state, so that all components are always in a stable and reliable state. Even when in the massage state, the piston rod will receive the reaction force acting on the human body transmitted by the massage head, and this reaction force will not affect the stability of the eccentric wheel slider, so that the vibration and noise generated during the use of the fascia gun can be well controlled, thereby effectively improving the operation quality and the equipment stability during use.

[0007] Further, for the convenience of actual assembly to achieve a convenient and reliable assembly between the eccentric wheel, the eccentric wheel slider, and the sliding inclined block, the following solution can be selected: The eccentric wheel includes an upper eccentric wheel and a lower eccentric wheel, and the limit sliding groove is composed of the upper eccentric wheel limit groove of the upper eccentric wheel and the lower eccentric wheel limit groove of the lower eccentric wheel. During actual installation, the lower eccentric wheel can be first installed on the motor output shaft, and then the sliding inclined block and the eccentric wheel slider are successively installed, and finally the upper eccentric wheel is buckled. This structural design also facilitates later disassembly and maintenance.

[0008] Further, for the assembly structure between the upper eccentric wheel and the lower eccentric wheel, in order to make the upper and lower eccentric wheels more stable after being buckled, so as to ensure that during actual use, the movement range of the eccentric wheel slider is always restricted within the limit sliding groove, the following solution is preferred: The upper eccentric wheel is provided with upper eccentric wheel fixing screw holes, and the lower eccentric wheel is provided with lower eccentric wheel fixing screw holes. The upper and lower eccentric wheels are connected and fixed by screws arranged in the upper eccentric wheel fixing screw holes and the lower eccentric wheel fixing screw holes; the lower eccentric wheel is rotatably connected to the motor output shaft. The fixed connection between the upper and lower eccentric wheels by screws ensures the structural stability of the limit sliding groove and also ensures the stability of the movement trajectory of the eccentric wheel slider.

[0009] Further, in view of the movement state of the eccentric wheel slider moving along the limit sliding groove, in order to limit the eccentric wheel slider, so that the eccentric wheel slider has stronger stability when it is at the extreme position at the end, it is preferred that one end of the upper eccentric wheel is provided with a slider limit platform, and the eccentric wheel slider is provided with a slider notch. The slider limit platform and the slider notch match each other to achieve sliding limit of the eccentric wheel slider.

[0010] Further, as a preferred structure of the sliding inclined block, the sliding inclined block can be selected as a polyhedron including an oblique quadrangular prism, and at least one pair of its side surfaces form a sliding connection with the inner wall surface of the slider inclined groove; the inner wall surface of the slider inclined groove forms a slide rail for the inclined surface of the inclined block and restricts the rotation of the sliding inclined block. Since the actual movement direction of the sliding inclined block is to move up and down along the direction of the motor output shaft when the motor output shaft drives the sliding inclined block to move. In order to convert the up and down movement into the movement of the eccentric slider structure perpendicular to the direction of the motor output shaft, it is necessary to ensure that the sliding inclined block has a corresponding driving inclined surface structure. In this preferred structure, the design of the oblique quadrangular prism of the sliding inclined block can achieve that when the sliding inclined block moves up and down, the inclined surface on its side drives the eccentric slider structure to move perpendicular to the direction of the motor output shaft, thus achieving the corresponding linkage effect.

[0011] Further, based on the same concept as the above solution, it is preferred that the sliding inclined block is an inclined circular arc-shaped cylinder, and at least part of its side surface forms a sliding connection with the inner wall surface of the sliding block inclined groove through the inclined block inclined surface; the inner wall surface of the sliding block inclined groove forms the slide rail of the sliding inclined block and restricts the rotation of the sliding inclined block.

[0012] Further, in combination with the actual use and design requirements, the parameters of the inclined block inclined surface of the sliding inclined block are set. Among them, the included angle α between the inclined block inclined surface of the sliding inclined block and the motor output shaft is defined, and 15° < α < 45° or -45° < α < -15°. Taking the axis of the motor output shaft as the reference, when the inclined block inclined surface is on one side of the motor output shaft, α is defined as a positive value, and generally 15° < α < 45° is selected. When the inclined block inclined surface is on the other side of the motor output shaft, α is defined as a negative value, and generally -45° < α < -15° is selected. The above-mentioned arrangement methods of the inclined block inclined surface on different sides of the motor output shaft can all well realize the corresponding linkage driving function.

[0013] Further, in combination with the actual use and design requirements, the dimensional relationship between the inclined block inclined surface of the sliding inclined block and the sliding block inclined groove is set. It is preferred that the length of the inclined block inclined surface of the sliding inclined block is h, and the length of the sliding block inclined groove is H, then 3mm < H - h < 15mm. Since the sliding inclined block can be slidably arranged in the sliding block inclined groove, first of all, H > h needs to be satisfied. Secondly, in combination with the overall structural dimensions of the fascia gun and the requirements of the internal space layout, 3mm < H - h < 15mm is preferably selected. This parameter range can not only realize the sliding of the sliding inclined block and drive the movement of the eccentric wheel sliding block, but also play the role of streamlining the internal layout of the fascia gun and saving the layout space.

[0014] Further, in order to limit the lower eccentric wheel and prevent the lower eccentric wheel from shifting in position due to unstable fixation, it is preferred that the lower eccentric wheel is rotatably connected to the motor output shaft through a bearing; a snap ring is arranged on the motor output shaft between the aforementioned bearing and the aforementioned sliding inclined block structure. After the lower eccentric wheel is rotatably connected to the motor output shaft through a bearing, a snap ring needs to be arranged on the lower eccentric wheel. This snap ring can limit the lower eccentric wheel and ensure that the lower eccentric wheel is always in a stable and reliable state during the movement process.

[0015] Further, as a specific structural form for realizing the eccentricity adjustment, when the motor output shaft rotates forward, the sliding inclined block moves downward / upward along the motor output shaft and pushes the eccentric slider structure to move left / right perpendicular to the motor output shaft. At this time, the eccentricity between the eccentric shaft and the motor output shaft is e1. When the motor output shaft rotates reversely, the sliding inclined block moves upward / downward along the motor output shaft and pushes the eccentric slider structure to move right / left perpendicular to the motor output shaft. At this time, the eccentricity between the eccentric shaft and the motor output shaft is e2. The above 1mm ≤ |e2 - e1| ≤ 6mm. By utilizing the forward and reverse movement forms of the motor, the sliding inclined block is respectively driven to move upward or downward along the direction of the motor output shaft, and thereby the vertical movement is converted into horizontal movement by the inclined surface of the inclined block of the sliding inclined block, that is, the sliding inclined block drives the eccentric slider structure to move perpendicular to the motor output shaft direction, and finally the adjustment of the eccentricity is realized. Combining the structural arrangement characteristics of the fascia gun, generally 1mm ≤ |e2 - e1| ≤ 6mm is preferably selected, which can not only ensure the difference in the use experience brought by the eccentricity adjustment, but also ensure the compactness requirement of the fascia gun structure arrangement.

[0016] The beneficial effects of the present invention are as follows: During actual use, the sliding inclined block is connected to the motor output shaft of the motor, and the motor can achieve two rotation directions of forward rotation and reverse rotation. The forward and reverse rotations of the motor are used to realize the sliding of the sliding inclined block between two extreme positions. Therefore, when the motor output shaft rotates forward, the sliding inclined block moves along the motor output shaft and drives the eccentric shaft to move to one side in the horizontal direction. At this time, it switches to the state where the eccentricity between the eccentric shaft and the motor output shaft is at the first extreme position. As long as the motor maintains forward rotation, the eccentricity will always be stably in this distance state. When the motor output shaft rotates reversely, the sliding inclined block moves along the motor output shaft and drives the eccentric shaft to move to the other side in the horizontal direction. At this time, the eccentricity between the eccentric shaft and the motor output shaft becomes the first extreme position state. As long as the motor maintains reverse rotation, the eccentricity will always be stably in this distance state. The present invention converts the rotation form of the motor output shaft into the up and down movement of the sliding inclined block, and then into the lateral movement of the eccentric shaft, thus successfully realizing the adjustment of the eccentric shaft. Such a function greatly improves the flexibility of the use of the fascia gun, and also allows the user to adjust the eccentricity according to their own situation, so as to obtain different massage force experiences. In addition, since the present invention adopts a driving structure in which the sliding inclined block slides and cooperates with the sliding block inclined groove at the bottom of the eccentric wheel sliding block, it can ensure that the eccentric wheel sliding block can obtain the supporting force of the sliding inclined block at any position in the limit sliding groove, that is, the stable supporting force between the inclined surface of the side of the sliding inclined block and the inner wall surface of the sliding block inclined groove. The present invention is particularly suitable for use occasions where the amplitude of the fascia gun needs to be variable. Description of the Drawings

[0017] Figure 1The sectional view along the plane where the central axis is located after removing the outer shell of the percussion gun with variable amplitude of the present invention.

[0018] Figure 2 The top view after removing the outer shell of the percussion gun with variable amplitude of the present invention.

[0019] Figure 3 The exploded view of the main internal components after removing the outer shell of the percussion gun with variable amplitude of the present invention.

[0020] Figure 4 Is Figure 1 The enlarged view in the direction A in

[0021] The markings in the figure are: motor 1, motor output shaft 2, external thread connection end 21 of the output shaft, snap ring groove 22, motor bracket 3, bearing 4, snap ring 41, sliding inclined block 5, internal thread hole 51 of the sliding inclined block, inclined block inclined surface 52, lower eccentric wheel 6, lower eccentric wheel limit groove 61, lower eccentric wheel fixing screw hole 62, upper eccentric wheel 7, upper eccentric wheel fixing screw hole 71, sliding block limit platform 72, upper eccentric wheel limit groove 73, eccentric wheel sliding block 8, sliding inclined block moving gap 81, sliding block inclined groove 82, eccentric shaft 83, sliding block notch 84, connecting rod 9, piston rod 10, included angle α, inclined block inclined surface length h, sliding block inclined groove length H. Detailed implementation mode

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] As Figures 1 to 4As shown in the figure, the main internal components of the fascia gun include a motor 1, an eccentric distance adjustment assembly with an eccentric shaft 83, a connecting rod 9, and a piston rod 10. One end of the connecting rod 9 is rotatably connected to the aforementioned eccentric shaft 83, and the other end of the connecting rod 9 is rotatably connected to the piston rod 10. Among them, the motor 1 first transmits the rotational motion to the sliding inclined block 5 of the eccentric distance adjustment assembly through the motor output shaft 2. Since the sliding inclined block 5 is in a threaded transmission connection with the motor output shaft 2 of the motor 1, the rotational motion of the motor output shaft 2 can drive the sliding inclined block 5 to move up and down along the direction of the motor output shaft 2 through the connection form of the threaded transmission connection. At the same time, since the sliding inclined block 5 is arranged in the sliding block inclined groove 82 at the bottom of the eccentric wheel sliding block 8, and the eccentric wheel sliding block 8 is slidably connected in the limit sliding groove of the eccentric wheel, when the sliding inclined block 5 moves up and down, with the action of the inclined block inclined surface 52 of the sliding inclined block 5, the up and down movement of the sliding inclined block 5 can be converted into the movement of the eccentric wheel sliding block 8 perpendicular to the direction of the motor output shaft 2, so as to sequentially realize the conversion of the rotation of the motor output shaft 2, the up and down movement of the sliding inclined block 5, and the horizontal movement of the eccentric wheel sliding block 8. With the horizontal movement of the eccentric wheel sliding block 8, the eccentric shaft 83 on the eccentric wheel sliding block 8 has a spacing adjustment relative to the motor output shaft 2, and this adjustment is the final eccentric distance adjustment to be achieved.

[0024] As the key component for realizing the above-mentioned motion conversion, the sliding inclined block 5, as Figure 1 shown, the sliding inclined block 5 can be selected to have an inclined quadrangular prism shape, such as a polyhedron including an oblique quadrangular prism or an oblique circular arc-shaped column. During actual assembly, there are threaded holes on the bottom end surface of the sliding inclined block 5 to form a threaded traditional connection with the motor output shaft 2; the left and right side surfaces of the sliding inclined block 5 are a pair of inclined block inclined surfaces 52 that are inclined at an angle relative to the motor output shaft 2; the bottom of the eccentric wheel sliding block 8 is provided with a sliding block inclined groove 82 corresponding to the sliding inclined block 5; the inclined block inclined surface 52 forms a sliding connection with the inner wall surface of the sliding block inclined groove 82, and at the same time, the inner wall surface of the sliding block inclined groove 82 forms a slide rail for the inclined block inclined surface 52 and restricts the rotation of the sliding inclined block 5. The size of the included angle α between the inclined block inclined surface 52 and the motor output shaft 2 determines the relationship between the movement range of the sliding inclined block 5 and the degree of eccentric distance adjustment, that is, as the included angle α gradually increases, the influence degree of the movement of the sliding inclined block 5 on the eccentric distance adjustment becomes greater. As Figure 4 shown, when the included angle α is 0 degrees, that is, the inclined block inclined surface 52 is parallel to the motor output shaft 2, obviously the sliding inclined block 5 loses the lateral driving effect on the eccentric wheel sliding block 8 in the direction perpendicular to the motor output shaft 2. Considering the actual use requirements, the general selection range is 15° < α < 45° to be appropriate. In addition, as Figure 4As shown, when the included angle α is on the right side of the motor output shaft 2, then -45° < α < -15°, which can also meet the relevant functional requirements. During actual production, it is also necessary to ensure a tight fit between the sliding inclined block 5 and the sliding block inclined groove 82, that is, the clearance between the sliding inclined block 5 and the sliding block inclined groove 82 should not be too large. The above clearance needs to ensure that the sliding inclined block 5 can slide flexibly within the sliding block inclined groove 82, and also prevent the sliding inclined block 5 from wobbling with the eccentric wheel sliding block 8 due to too large a clearance. In addition, since the sliding inclined block 5 is slidably arranged within the sliding block inclined groove 82, the movement range of the sliding inclined block 5 will inevitably be limited by the size of the sliding block inclined groove 82. In order to achieve the driving effect on the sliding inclined block 5 and take into account the layout space of each component of the fascia gun, as Figure 4 shown, define the length of the inclined surface 52 of the inclined block of the sliding inclined block 5 as h, and the length of the sliding block inclined groove 82 as H. Generally, it is appropriate that 3mm < H - h < 15mm.

[0025] The adjustment of the above eccentricity is achieved based on the rotational form that the motor can rotate forward and backward. When the motor output shaft 2 rotates forward, the sliding inclined block 5 moves downward / upward along the motor output shaft 2 and pushes the eccentric slider structure to move left / right perpendicular to the motor output shaft 2. At this time, the eccentricity between the eccentric shaft 83 and the motor output shaft 2 is e1; when the motor output shaft 2 rotates backward, the sliding inclined block 5 moves upward / downward along the motor output shaft 2 and pushes the eccentric slider structure to move right / left perpendicular to the motor output shaft 2. At this time, the eccentricity between the eccentric shaft 83 and the motor output shaft 2 is e2. Generally, considering the layout requirements of the space structure of the fascia gun, it is possible to rotate 1mm ≤ |e2 - e1| ≤ 6mm.

[0026] Regarding the eccentric wheel slider 8, it is slidably arranged in the limiting chute formed by enclosing the upper eccentric wheel limiting groove 73 of the upper eccentric wheel 7 and the lower eccentric wheel limiting groove 61 of the lower eccentric wheel 6. Among them, the upper eccentric wheel 7 and the lower eccentric wheel 6 are connected and fixed by screws arranged in the upper eccentric wheel fixing screw hole 71 and the lower eccentric wheel fixing screw hole 62, thereby constructing a stable limiting chute structure. The reason for such a design is that when the eccentric wheel slider 8 is driven by the sliding wedge 5, it needs to move in the corresponding direction to adjust the eccentricity. Therefore, while ensuring that the eccentric wheel slider 8 can slide, the limiting chute needs to always limit the eccentric wheel slider 8 within its limiting chute and prevent it from sliding outside the limiting chute. Generally, the limiting chute is a linear groove structure, and the slider inclined groove 82 is also a linear groove structure. When the sliding wedge 5 in the slider inclined groove 82 moves to one end of the slider inclined groove 82, the corresponding eccentric wheel slider 8 moves to one end of the linear limiting chute, which is a limit position; when the sliding wedge 5 in the slider inclined groove 82 moves to the other end of the slider inclined groove 82, and the eccentric wheel slider 8 moves to the other end of the linear limiting chute, it corresponds to another limit position. The above two different limit positions correspond to two eccentricities respectively, thereby realizing the adjustment of the eccentricity.

[0027] When actually assembling this structure, the motor bracket 3 can be first fixed on the motor 1, then the bearing 4 is pressed into the lower eccentric wheel 6, the lower eccentric wheel 6 with the pressed bearing 4 is installed in the motor output shaft 2, and then the lower eccentric wheel 6 is fixed with a circlip 41 to prevent the lower eccentric wheel 6 from moving up and down. Subsequently, the sliding wedge 5 is installed on the threaded connection end 21 of the output shaft of the motor output shaft 2, and the eccentric wheel slider 8 is placed in sequence. Then, the upper eccentric wheel 7 is installed and the upper eccentric wheel 7 and the lower eccentric wheel 6 are locked with screws. Next, the connecting rod 9 is installed on the eccentric shaft 83 of the eccentric wheel slider 8, and the front piston rod 10 is installed. Subsequently, the entire assembly is fixed on the housing with screws, and the entire housing is installed.

Claims

1. Fascia gun with variable amplitude, comprising a motor (1), an eccentric distance adjustment assembly with an eccentric shaft (83), a connecting rod (9) and a piston rod (10), one end of the connecting rod (9) is rotatably connected to the aforementioned eccentric shaft (83), and the other end of the connecting rod (9) is rotatably connected to the piston rod (10); characterized in that: The eccentricity adjustment assembly includes a sliding inclined block (5) and an eccentric slider structure with an eccentric shaft (83). A threaded transmission connection is provided between the motor output shaft (2) of the motor (1) and the sliding inclined block (5). Driven by the motor (1), the sliding inclined block (5) slides on the eccentric slider structure and pushes the eccentric slider structure to move perpendicular to the direction of the motor output shaft (2). It includes a motor bracket (3), and the motor bracket (3) is fixed on the motor (1). The eccentric slider structure includes an eccentric wheel and an eccentric wheel slider (8). The eccentric wheel is rotatably connected to the motor output shaft (2), and a limiting chute perpendicular to the direction of the motor output shaft (2) is arranged therein. The eccentric wheel slider (8) is slidably connected to the limiting chute. A sliding block inclined groove (82) is arranged at the bottom of the eccentric wheel slider (8), and the eccentric shaft (83) is arranged on the eccentric wheel slider (8). The sliding inclined block (5) is slidably arranged in the sliding block inclined groove (82). The motor output shaft (2) drives the sliding inclined block (5) to slide along the aforementioned sliding block inclined groove (82) and pushes the eccentric wheel slider (8) to move along the aforementioned limiting chute.

2. The fascia gun with variable amplitude according to claim 1, wherein: The eccentric wheel includes an upper eccentric wheel (7) and a lower eccentric wheel (6), and the limiting chute is composed of an upper eccentric wheel limiting groove (73) of the upper eccentric wheel (7) and a lower eccentric wheel limiting groove (61) of the lower eccentric wheel (6).

3. The percussion massager with variable amplitude according to claim 2, wherein: The upper eccentric wheel (7) is provided with an upper eccentric wheel fixing screw hole (71), and the lower eccentric wheel (6) is provided with a lower eccentric wheel fixing screw hole (62). The upper eccentric wheel (7) and the lower eccentric wheel (6) are connected and fixed by screws arranged in the upper eccentric wheel fixing screw hole (71) and the lower eccentric wheel fixing screw hole (62). The lower eccentric wheel (6) is rotatably connected to the motor output shaft (2).

4. The percussion massage gun with variable amplitude according to claim 3, wherein: One end of the upper eccentric wheel (7) is provided with a sliding block limiting platform (72), and the eccentric wheel slider (8) is provided with a sliding block notch (84). The sliding block limiting platform (72) and the sliding block notch (84) match each other to realize the sliding limit of the eccentric wheel slider (8).

5. The percussion massage gun with variable amplitude according to claim 1, wherein: The sliding inclined block (5) is a polyhedron including an oblique quadrangular prism, and at least a pair of its side surfaces are inclined block inclined surfaces (52) that form a sliding connection with the inner wall surface of the sliding block inclined groove (82). The inner wall surface of the sliding block inclined groove (82) forms a slide rail for the inclined block inclined surface (52) and restricts the rotation of the sliding inclined block (5).

6. The percussion massage gun with variable amplitude according to claim 1, wherein: The sliding inclined block (5) is an oblique arc-shaped cylinder, and at least a part of its side surface is an inclined block inclined surface (52) that forms a sliding connection with the inner wall surface of the sliding block inclined groove (82). The inner wall surface of the sliding block inclined groove (82) forms a slide rail for the sliding inclined block (5) and restricts the rotation of the sliding inclined block (5).

7. The percussion massage gun with variable amplitude according to claim 5 or 6, characterized in that: The included angle α between the inclined block inclined surface (52) of the sliding inclined block (5) and the motor output shaft (2) satisfies 15° < α < 45° or -45° < α < -15°.

8. The variable-amplitude fascia gun according to any one of claims 1 to 6, characterized in that: If the length of the inclined block inclined surface (52) of the sliding inclined block (5) is h and the length of the sliding block inclined groove (82) is H, then 3mm < H - h < 15mm.

9. The variable-amplitude fascia gun according to claim 4, wherein: The lower eccentric wheel (6) is rotationally connected to the motor output shaft (2) via a bearing (4); a snap ring (41) is provided on the motor output shaft (2) between the aforementioned bearing (4) and the aforementioned sliding inclined block (5).

10. The fascia gun with variable amplitude according to claim 1, characterized in that: When the motor output shaft (2) rotates forward, the sliding inclined block (5) moves downward / upward along the motor output shaft (2) and pushes the eccentric slider structure to move left / right perpendicular to the motor output shaft (2). At this time, the eccentricity between the eccentric shaft (83) and the motor output shaft (2) is e1; When the motor output shaft (2) rotates in reverse, the sliding inclined block (5) moves upward / downward along the motor output shaft (2) and pushes the eccentric slider structure to move right / left perpendicular to the motor output shaft (2). At this time, the eccentricity between the eccentric shaft (83) and the motor output shaft (2) is e2; 1 mm ≤ |e2 - e1| ≤ 6 mm.

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