Variable amplitude adjusting mechanism and fascia gun

Abstract

The utility model relates to the field of fascia guns, in particular to a variable amplitude adjusting mechanism and a fascia gun, which can still ensure the structural stability of the amplitude adjusting mechanism under the condition of high-speed reciprocating motion so as to realize the use reliability of fascia gun equipment. The central shaft guide block is in sliding fit with the sliding eccentric wheel through an oblique sliding structure which is obliquely crossed with the output shaft of the motor; the movement of the central shaft guide block in the axis direction of the output shaft of the motor is converted into the horizontal movement of the sliding eccentric shaft in the direction of the eccentric wheel sliding chute; the oblique sliding structure comprises a guide sliding groove formed in the sliding eccentric wheel and a guide boss arranged on the center shaft guide block, the cross section of the guide sliding groove is in a trapezoid shape, the bottom edge of the trapezoid is arranged at the bottom of the guide sliding groove, and the cross section of the guide boss is matched with the cross section of the guide sliding groove. The guide boss is arranged in the guide sliding groove in a sliding mode. The utility model is especially suitable for fascia guns.

Description

Technical Field

[0001] The utility model relates to the field of fascia guns, in particular to a variable amplitude adjustment mechanism and a fascia gun. 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 muscle layer, which reduces local tissue tension, relieves pain, and promotes blood circulation. With the existing fascia gun, users can 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 fascia guns with shallow amplitude depth at first, and then gradually deepen the amplitude as needed. However, most of the fascia guns or muscle massagers on the market now use a crank slider mechanism and an eccentric wheel to realize the rotation conversion of the motor to realize the reciprocating motion of the massage head. Since the eccentric distance on the eccentric wheel is fixed, the striking stroke of the reciprocating motion of the fascia gun is fixed, so the amplitude cannot be changed, and it cannot meet more user usage scenarios.

[0003] Taking the application of publication number CN117860552A as an example, it discloses a scheme that can realize the amplitude adjustment of the fascia gun. The core mechanism for realizing the amplitude adjustment is to slide a slider on the eccentric wheel, and the slider and the eccentric wheel are connected by a wedge-shaped surface, and then the slider rotates to connect the connecting rod, and the slider is adjusted to move up and down, and then through the action of the wedge-shaped inclined surface, the eccentric wheel and the slider are moved horizontally, so that the axis of the connecting rod connected to the slider and the motor axis are changed, that is, the eccentric distance adjustment is realized. Since the inclined surface matching has no reliable limit, the scheme realizes the limit of the relative sliding position through the elastic force of the spring. In fact, during the rotation process, the structure of the reference document will cause the relative sliding of the inclined surface, resulting in the inability of the adjustment state to be relatively stopped, which is a factor affecting the instability of the amplitude after the amplitude adjustment. Especially in the high-frequency vibration use environment of the fascia gun, the simple matching structure in the reference document cannot achieve the reliable and stable use requirements, resulting in the subsequent service life of the fascia gun is also affected. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a variable amplitude adjustment mechanism and a fascia gun which can still ensure the structural stability of the amplitude adjustment mechanism under the condition of high-speed reciprocating motion, thereby realizing the reliability of the use of the fascia gun equipment.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a variable amplitude adjustment mechanism, including a piston rod, a transmission arm and a rotatable eccentric wheel, one end of the transmission arm is hinged to the piston rod, the piston rod is slidably arranged, the eccentric wheel includes an eccentric wheel input hole, and the motor output shaft of the motor is fixedly arranged in the eccentric wheel input hole; the eccentric wheel includes an eccentric wheel slide groove, the extension direction of the eccentric wheel slide groove is perpendicular to the motor output shaft, a sliding eccentric wheel is slidably arranged in the eccentric wheel slide groove, the sliding eccentric shaft of the sliding eccentric wheel is parallel to the motor output shaft, and the other end of the transmission arm is hinged to the sliding eccentric shaft; including a rotation axis along the axis direction of the motor output shaft The central shaft guide block for lateral movement is provided, and the central shaft guide block and the sliding eccentric wheel are slidably matched by an oblique sliding structure oblique to the motor output shaft. The movement of the central shaft guide block along the axial direction of the motor output shaft is converted into the horizontal movement of the sliding eccentric shaft along the direction of the eccentric wheel slot; the oblique sliding structure includes a guide slot provided on the sliding eccentric wheel and a guide boss provided on the central shaft guide block. The cross-sectional shape of the guide slot is a trapezoid. The bottom edge of the trapezoid is provided at the bottom of the guide slot. The cross-sectional shape of the guide boss matches the cross-sectional shape of the guide slot. The guide boss can be slidably provided in the guide slot. Aiming at the use conditions of the high-speed reciprocating motion mechanism, this scheme makes specific structural improvements to the oblique sliding structure between the central shaft guide block and the sliding eccentric wheel. While realizing the conversion of vertical motion into lateral movement, it can also prevent the lateral motion from being reversely converted into vertical motion, thereby realizing the locking of the new state. Specifically, the cross-sectional shape of the guide slot is a trapezoid, the cross-sectional shape of the guide boss matches the cross-sectional shape of the guide slot, the guide boss is engaged in the guide slot, and the guide boss can be slidably disposed in the guide slot. This structural design allows the guide boss and the guide slot to slide while ensuring the stability of the connection between them, thereby achieving locking. In fact, the guide boss can drive the guide slot to move laterally during the sliding process, and the guide slot and the guide boss are always in an engaged and non-detached state.

[0006] In order to further improve the clamping effect between the eccentric wheel slot and the sliding eccentric wheel, the following scheme can be selected: the cross-sectional shape of the eccentric wheel is T-shaped, the sliding eccentric wheel includes a T-shaped slider that matches the eccentric wheel slot, and the sliding eccentric wheel is slidably set in the eccentric wheel slot through the T-shaped slider. This scheme improves the eccentric wheel slot and the sliding eccentric wheel that slides with it, so that the sliding eccentric wheel is clamped by the T-shaped slider and can be slidably set in the eccentric wheel slot. In this way, under the premise of ensuring that the sliding eccentric wheel can slide smoothly along the direction of the eccentric wheel slot, the T-shaped buckle structure effectively prevents the sliding eccentric wheel from shaking laterally, thereby ensuring the stability of the position and improving the texture and quality of the amplitude adjustment.

[0007] In order to realize the motion control of the central shaft guide block under the condition of limited layout space, and then realize the accurate adjustment of the amplitude, the following scheme can be selected: the central shaft guide block includes a central control shaft, and the guide boss is arranged at the end of one end of the central control shaft. The central control shaft can slide through the eccentric wheel, and the central control shaft is arranged coaxially with the motor output shaft. The central control shaft slides up and down along the eccentric wheel to realize the up and down drive of the central shaft guide block, and then drives the sliding eccentric wheel through the central shaft guide block to realize horizontal lateral movement, so as to finally realize the adjustment of the amplitude. Among them, the central control shaft can be arranged coaxially with the motor output shaft, thereby further saving the layout space, making the volume of the corresponding product smaller, and making the product more portable.

[0008] As an implementation structure for realizing the coaxial arrangement of the above-mentioned central control shaft and the motor output shaft, the following scheme can be selected: the cross-section of the motor output shaft is a hollow D-shaped structure, and the free end of the central control shaft passes through the hollow structure inside the motor output shaft and is connected to the central control shaft adjustment mechanism. First, after the motor output shaft with the D-shaped structure cooperates with the eccentric wheel input hole of the eccentric wheel, it can stably drive the eccentric wheel to rotate, and prevent the slippage of the motor output shaft with a circular cross-section. Secondly, the interior of the motor output shaft with the D-shaped structure is a hollow structure, which can be used to arrange the free end of the central control shaft arranged coaxially therewith, thereby saving the layout space.

[0009] In order to adjust the up and down movement of the central control shaft and thus adjust the amplitude, the following solution can be selected: the central control shaft adjustment mechanism includes an adjustment slider, the free end of the central control shaft is connected to the adjustment slider through a bearing, and the adjustment slider moves along the axis direction of the central control shaft. In actual arrangement, the up and down movement of the adjustment slider drives the up and down movement of the central control shaft, and then the sliding eccentric shaft moves along the direction of the eccentric wheel slot, that is, horizontally, to adjust the eccentricity and finally adjust the amplitude.

[0010] In order to adjust the up and down movement range of the adjustment slider and obtain a wider amplitude range, an adjustment slider driving mechanism connected to the adjustment slider is included, and the adjustment slider driving mechanism is used to drive the adjustment slider to move along the axial direction of the central control axis. The adjustment slider driving mechanism adjusts the up and down movement range of the adjustment slider. When the movement range of the adjustment slider changes, the horizontal movement range of the sliding eccentric shaft driven by it also changes in conjunction, and then the corresponding amplitude range also changes. In the process of massaging muscles with a fascia gun, the amplitude required for muscles in different parts is different. This solution allows users to obtain the amplitude of the muscles they need to massage, making the massage more flexible and scientific, and obtaining a better massage experience.

[0011] As a preferred implementation structure of the above-mentioned adjusting slider driving mechanism, the following scheme can be selected: the adjusting slider driving mechanism includes a rotatable adjusting upper cover, the top of the adjusting slider is provided with an adjusting thread, the adjusting thread is coaxially arranged with the motor output shaft, the adjusting slider is connected to the bottom of the adjusting upper cover through the adjusting thread, the adjusting slider is limited to slide only along the axial direction of the central control shaft, and the adjusting upper cover is rotated to drive the adjusting slider to pull the central control shaft to slide synchronously. By rotating the adjusting upper cover, the position of the adjusting slider in the vertical direction can be changed, thereby pulling the central control shaft to slide synchronously, thereby adjusting the position of the adjusting slider in disguised form, thereby obtaining different amplitude ranges.

[0012] As another preferred implementation structure of the above-mentioned adjusting slider driving mechanism, the following scheme can be selected: the adjusting slider driving mechanism includes an adjusting motor that can realize forward and reverse rotation, the output shaft of the adjusting motor is connected to the adjusting upper cover, and the motor drives the adjusting upper cover to rotate to realize the upward and downward movement of the adjusting slider. The forward and reverse rotation of the motor correspond to the upward and downward movement of the adjusting slider, respectively, thereby changing the position of the adjusting slider, that is, obtaining different amplitude ranges.

[0013] Generally, it is preferred that the angle between the bottom surface of the guide slot of the oblique sliding structure and the motor output shaft is 45 degrees, so as to obtain better transmission of driving force during the driving process.

[0014] The fascia gun includes a sliding sleeve, and the piston rod is slidably arranged in the sliding sleeve. In actual use, whether in the amplitude adjustment change process of converting the movement of the central shaft guide block in the vertical direction into the horizontal movement of the sliding eccentric shaft in the direction of the eccentric wheel slide groove, or in the massage process with a fixed amplitude, since the guide boss is clamped in the guide slide groove and the state can be locked, the lateral shaking of the sliding eccentric wheel can be effectively prevented, thereby ensuring the stability of the position and improving the massage texture and quality of the fascia gun.

[0015] The beneficial effect of the utility model is that the high-speed reciprocating motion mechanism has high requirements for the stability of the matching between the components. The solution optimizes the matching structure between the guide boss and the guide slot, and effectively improves the stability of the matching relationship between them while ensuring normal sliding. The utility model is particularly suitable for fascia guns. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an exploded view of various components of an embodiment of the utility model.

[0017] Figure 2 It is a schematic diagram of the positional relationship among the eccentric wheel, the sliding eccentric shaft and the central shaft guide block in an embodiment of the utility model.

[0018] Figure 3 It is a cross-sectional view of an embodiment of the utility model.

[0019] Figure 4 It is a schematic diagram of the guide slot of the sliding eccentric shaft of the utility model.

[0020] Figure 5 It is a schematic diagram of the matching relationship between the guide slide groove and the guide boss 63 of the utility model.

[0021] Marked in the figure are: sliding sleeve 1, fixing bracket 2, piston rod 3, transmission arm 4, piston rod and transmission arm fixing screw 41, transmission arm and eccentric shaft fixing screw 42, eccentric wheel 5, eccentric wheel slide groove 51, central shaft guide block 6, central control shaft 61, boss side 62, guide boss 63, sliding eccentric shaft 7, sliding eccentric wheel 71, guide slide groove 72, T-shaped slider 73, slide groove side 74, motor 8, bearing 81, adjustment cover 9, adjustment slider 91. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figures 1 to 5 The embodiment of the variable amplitude adjustment mechanism applied to the fascia gun is shown. The piston rod 3 is slidably arranged in the sleeve 1, and the piston rod 3 reciprocates along the axis direction of the sleeve. The piston rod 3 can be provided with a corresponding massage head according to the massage needs, and the piston rod 3 drives the massage head to reciprocate to achieve the hitting of the muscles. The sleeve 1 is fixed by a fixed bracket 2. The piston rod 3 is hinged to one end of the transmission arm 4 through the piston rod and the transmission arm fixing screw 41, and the other end of the transmission arm 4 is hinged to the sliding eccentric shaft 7 of the sliding eccentric wheel 71 through the transmission arm and the eccentric shaft fixing screw 42. In this embodiment, the sliding eccentric wheel 71 of the sliding eccentric wheel 71 is extended downward. The motor output shaft of the motor 8 drives the eccentric wheel 5 to rotate, and the eccentric wheel 5 rotates with the sliding eccentric shaft 7. The rotating sliding eccentric shaft 7 drives the transmission arm 4 to swing and drives the piston rod 3 to reciprocate. When adjustment is required, the central control shaft 61 moves in the vertical direction and drives the central shaft guide block 6 to move in the vertical direction. The moving central shaft guide block 6 drives the sliding eccentric shaft 7 to move in the horizontal direction through the oblique sliding structure between the sliding eccentric shaft 7. The principle of converting vertical motion to horizontal motion here is the structural design of the oblique sliding structure and the motor output shaft. Generally, the angle between the bottom surface of the guide slot 72 of the oblique sliding structure and the motor output shaft is preferably 45 degrees.

[0024] like Figure 2 as well as Figure 4As shown, the guide boss 63 of the central axis guide block 6 is protrudingly arranged on the boss side 62, and the guide slot 72 of the sliding eccentric wheel 71 is recessed inward relative to the slot side 74, thereby forming a snap-fit ​​structure between the guide boss 63 and the guide slot 72. Among them, the cross-sectional shape of the slot side 74 is a trapezoid, and the bottom edge of the trapezoid is arranged at the bottom of the slot side 74, thereby forming a contracted slot structure. This contracted guide slot 72 can form a mutually snap-fit ​​structure with the matching guide boss 63 to prevent the guide boss 63 from falling off from the guide slot 72 during the process of adjusting the amplitude, and can also achieve the locking of the new position state after adjustment. After the guide boss 63 is arranged in the slot side 74, the top surface of the guide boss 63 is tightly arranged with the bottom surface of the slot side 74, and the edges on both sides of the guide boss 63 are tightly arranged with the edges on both sides of the slot side 74. During actual adjustment, the guide boss 63 can slide smoothly along the extension direction of the guide slot 72, but the guide boss 63 will not shake in the direction perpendicular to the extension direction of the guide slot 72. This ensures that during the entire adjustment process of the amplitude, the central shaft guide block 6 and the sliding eccentric wheel 71 can still achieve smooth and reliable relative sliding under high-speed motion, preventing the central shaft guide block 6 and the sliding eccentric wheel 71 from falling off during the amplitude adjustment process. If they fall off, the entire fascia gun product will be completely damaged.

[0025] like Figure 2 As shown, the sliding eccentric wheel 71 is slidably arranged in the T-shaped eccentric wheel groove 51 matching the T-shaped slider 73 through the T-shaped slider 73. The protruding parts on both sides of the T-shaped slider 73 can be snap-fitted into the grooves on both sides of the eccentric wheel groove 51, thereby achieving the corresponding snap-fitting limiting effect. On the premise of ensuring that the T-shaped slider 73 can reciprocate along the extension direction of the eccentric wheel groove 51, the T-shaped slider 73 can also be prevented from shaking in the direction perpendicular to the extension direction of the eccentric wheel groove 51, thereby effectively improving the structural stability during use. For the fascia gun product that runs at high speed to achieve muscle striking massage, it can not only ensure the adjusted striking effect, but also effectively improve the service life of the equipment.

[0026] In view of the compact layout space inside the fascia gun product, the central control shaft 61 used to drive the central shaft guide block 6 to move and the motor output shaft of the motor 8 can be integrated in terms of layout space. Figures 1 to 3As shown, first, the motor output shaft of the motor 8 is designed as a hollow D-shaped structure. The motor output shaft of the D-shaped structure cooperates with the eccentric wheel input hole of the eccentric wheel 5 to ensure that the motor output shaft drives the eccentric wheel 5 to rotate. The central control shaft 61 is coaxially arranged with the motor output shaft. After the central control shaft 61 passes through the rotation axis of the eccentric wheel 5, the free end of the central control shaft 61 is arranged in the hollow interior of the motor output shaft, thereby realizing the inner and outer coupling arrangement of the central control shaft 61 and the motor output shaft. However, the rotation of the motor output shaft and the movement of the central control shaft 61 are independent of each other. The central control shaft 61 moves up and down along the axial direction of the motor output shaft to adjust the up and down movement of the central shaft guide block 6. On this basis, the free end of the central control shaft 61 is connected to the adjusting slider 91 through the bearing 81, and the up and down movement of the adjusting slider 91 can drive the central control shaft 61 to move up and down together. The solution of arranging the central control shaft 61 coaxially with the motor output shaft not only saves the tight layout space inside the fascia gun, allowing smaller fascia gun products to achieve stable and reliable amplitude adjustment, but also further reduces defects such as noise and shaking during the adjustment process, providing a better operating experience for the fascia gun.

[0027] Furthermore, in order to achieve the adjustment of the slider 91 to adjust the range of the central control shaft 61 up and down, as shown in FIG. Figure 1 as well as Figure 3 As shown, an adjusting thread is provided on the top of the adjusting slider 91, and the adjusting thread is arranged coaxially with the motor output shaft. The adjusting slider 91 is connected to the bottom of the adjusting upper cover 9 through the adjusting thread. The adjusting slider 91 is limited to slide only along the axial direction of the central control shaft 61. The adjusting upper cover 9 is rotated to drive the adjusting slider 91 to pull the central control shaft 61 to slide synchronously. Specifically, the adjusting upper cover 9 is rotated to drive the adjusting slider 91 to move upward or downward through the adjusting thread. The moving adjusting slider 91 pulls the central control shaft 61 to move upward or downward synchronously through the bearing 81. After the position of the central control shaft 61 changes, the position of the central shaft guide block 6 and the guide boss 63 at the bottom of the central control shaft 61 changes accordingly. When the position of the guide boss 63 changes, the sliding eccentric wheel 71 is driven to move horizontally through the guide slot 72, thereby realizing the adjustment of the eccentricity. This adjustment scheme is very convenient in operation, and the driving mode of the adjusting thread can realize stable and precise adjustment of the central shaft guide block 6, making the amplitude adjustment of the fascia gun more accurate and reliable.

Claims

1. A variable amplitude adjustment mechanism, comprising a piston rod (3), a transmission arm (4) and a rotatable eccentric wheel (5), wherein one end of the transmission arm (4) is hinged to the piston rod (3), the piston rod (3) is slidably arranged, and the eccentric wheel (5) comprises an eccentric wheel input hole, in which a motor output shaft of a motor (8) is fixedly arranged; characterized in that: The eccentric wheel (5) comprises an eccentric wheel slide groove (51), the extension direction of the eccentric wheel slide groove (51) is perpendicular to the motor output shaft, a sliding eccentric wheel (71) is slidably arranged in the eccentric wheel slide groove (51), a sliding eccentric shaft (7) of the sliding eccentric wheel (71) is parallel to the motor output shaft, and the other end of the transmission arm (4) is hinged to the sliding eccentric shaft (7); It comprises a central shaft guide block (6) that moves along the axial direction of the motor output shaft, wherein the central shaft guide block (6) and the sliding eccentric wheel (71) are slidably matched via an oblique sliding structure that is oblique to the motor output shaft, and the movement of the central shaft guide block (6) along the axial direction of the motor output shaft is converted into horizontal movement of the sliding eccentric shaft (7) along the direction of the eccentric wheel slide groove (51); The oblique sliding structure comprises a guide slot (72) arranged on the sliding eccentric wheel (71) and a guide boss (63) arranged on the central shaft guide block (6); the cross-sectional shape of the guide slot (72) is a trapezoid; the bottom edge of the trapezoid is arranged at the bottom of the guide slot (72); the cross-sectional shape of the guide boss (63) matches the cross-sectional shape of the guide slot (72); and the guide boss (63) can be slidably arranged in the guide slot (72).

2. The variable amplitude adjustment mechanism according to claim 1, characterized in that: The cross-sectional shape of the eccentric wheel slide groove (51) is T-shaped, and the sliding eccentric wheel (71) comprises a T-shaped slider (73) matching the eccentric wheel slide groove (51). The sliding eccentric wheel (71) is slidably arranged in the eccentric wheel slide groove (51) by means of the T-shaped slider (73).

3. The variable amplitude adjustment mechanism according to claim 2, characterized in that: The central shaft guide block (6) comprises a central control shaft (61), a guide boss (63) is arranged at the end of one end of the central control shaft (61), the central control shaft (61) can slide through the eccentric wheel (5), and the central control shaft (61) is coaxially arranged with the motor output shaft.

4. The variable amplitude adjustment mechanism according to claim 3, characterized in that: The cross section of the motor output shaft is a hollow D-shaped structure, and the free end of the central control shaft (61) passes through the hollow structure inside the motor output shaft and is connected to the central control shaft adjustment mechanism.

5. The variable amplitude adjustment mechanism according to claim 4, characterized in that: The central control shaft adjustment mechanism comprises an adjustment slider (91). The free end of the central control shaft (61) is connected to the adjustment slider (91) via a bearing (81). The adjustment slider (91) moves along the axial direction of the central control shaft (61).

6. The variable amplitude adjustment mechanism according to claim 5, characterized in that: It comprises an adjusting slider driving mechanism connected to the adjusting slider (91), and the adjusting slider driving mechanism is used to drive the adjusting slider (91) to move along the axial direction of the central control shaft (61).

7. The variable amplitude adjustment mechanism according to claim 6, characterized in that: The adjusting slider driving mechanism comprises a rotatable adjusting upper cover (9), the top of the adjusting slider (91) is provided with an adjusting thread, the adjusting thread is coaxially arranged with the motor output shaft, the adjusting slider (91) is connected to the bottom of the adjusting upper cover (9) through the adjusting thread, the adjusting slider (91) is limited to be able to slide only along the axial direction of the central control shaft (61), and the adjusting upper cover (9) is rotated to drive the adjusting slider (91) to pull the central control shaft (61) to slide synchronously.

8. The variable amplitude adjustment mechanism according to claim 7, characterized in that: The adjusting slider driving mechanism comprises an adjusting motor capable of realizing forward and reverse rotation, wherein the output shaft of the adjusting motor is connected to the adjusting upper cover (9), and the motor drives the adjusting upper cover (9) to rotate so as to realize the upward and downward movement of the adjusting slider (91).

9. The variable amplitude adjustment mechanism according to any one of claims 1 to 8, characterized in that: The angle between the bottom surface of the guide slide groove (72) of the oblique sliding structure and the motor output shaft is 45 degrees.

10. A fascia gun, comprising a sliding sleeve (1), characterized in that: It also comprises a variable amplitude adjustment mechanism as claimed in any one of claims 1 to 9, wherein the piston rod (3) is slidably arranged in the sliding sleeve (1).

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