Massage head assembly and fascia gun

Abstract

The utility model relates to a massage head assembly and a fascia gun. The massage head assembly comprises a massage head, a connecting part and a piston connected with a driving mechanism in the fascia gun. The connecting part comprises a first connecting part and a second connecting part, the second connecting part is provided with a connecting hole allowing the first connecting part to enter, one of the first connecting part and the second connecting part is fixed to the massage head, the other one is fixed to the piston, the first connecting part is provided with a first screw, and the connecting hole is provided with a second screw matched with the first screw. The massage head is detachably connected with the piston through the rotary connection of the second screw and the first screw. The fascia gun comprises a main body and the massage head assembly. The connecting position of the massage head and the piston is good in stability, the massage head cannot shake after being used for a long time, and user experience is better.

Description

Technical Field

[0001] The utility model relates to the technical field of fascia guns, in particular to a massage head assembly and a fascia gun. Background Art

[0002] The fascia gun can effectively relieve muscle fatigue, promote blood circulation and accelerate lactic acid metabolism when used through the close contact between the front massage head and human muscles. With the popularity of fascia guns, users have higher and higher requirements for their user experience. However, there is a common problem with the massage heads of fascia guns on the market. That is, the connection of the massage head is prone to shaking after long-term use, resulting in unstable connection. This shaking not only affects the stability of the massage head, but may also cause discomfort to the user during use, and may even damage the fascia gun due to long-term use. Utility Model Content

[0003] The utility model provides a massage head assembly and a fascia gun. The connection between the massage head and the piston is stable, the massage head will not shake when used for a long time, and the user experience is better.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A massage head assembly is used in a fascia gun, comprising a massage head, a connecting part, and a piston connected to a driving mechanism in the fascia gun;

[0006] The above-mentioned connecting part includes a first connecting part and a second connecting part, the above-mentioned second connecting part is provided with a connecting hole for the above-mentioned first connecting part to enter, one of the above-mentioned first connecting part and the above-mentioned second connecting part is fixed to the above-mentioned massage head, and the other is fixed to the above-mentioned piston, the above-mentioned first connecting part is provided with a first spiral, and the above-mentioned connecting hole is provided with a second spiral cooperating with the above-mentioned first spiral, and the above-mentioned massage head and the above-mentioned piston are detachably connected by the rotation connection of the above-mentioned second spiral and the above-mentioned first spiral.

[0007] Preferably, it further comprises a limiting member, wherein the limiting member comprises an elastic fixing portion;

[0008] The elastic fixing portion is arranged between the first connecting portion and the connecting hole, so that the first connecting portion is interference-connected with the connecting hole and / or the second spiral.

[0009] Preferably, the first connecting portion comprises a connecting column and a boss; the first spiral is arranged on the connecting column;

[0010] When the massage head is connected to the piston, the connecting column is located in the connecting hole, and the boss is located outside the connecting hole and abuts against the end of the second connecting portion.

[0011] Preferably, the above-mentioned limiting member also includes an elastic abutment portion, which is connected to the end of the above-mentioned elastic fixing portion and the two are coaxial. The above-mentioned elastic abutment portion is sleeved on the outer peripheral side of the above-mentioned first connecting portion to fill the gap between the above-mentioned boss and the above-mentioned second connecting portion.

[0012] Preferably, the first connecting portion is circumferentially provided with a limiting groove, the elastic fixing portion is sleeved in the limiting groove, and the outer diameter of the elastic fixing portion is not less than the minor diameter of the second spiral; or

[0013] The elastic fixing portion is embedded in the connecting hole, and the inner diameter of the elastic fixing portion is not greater than the major diameter of the first spiral.

[0014] Preferably, the driving mechanism in the fascia gun includes a connecting rod, and when the first connecting portion is arranged on the massage head and the second connecting portion is arranged on the piston, a first mounting groove is arranged on one end of the connecting rod facing the piston, the connecting hole extends and passes through the piston, a blocking plate is arranged on the end of the piston away from the massage head, the blocking plate is used to close the connecting hole, and the end of the piston away from the massage head is installed in the first mounting groove;

[0015] The bottom of the blocking plate is provided with a first vent hole, the first mounting groove is provided with a second vent hole, and the connecting hole is communicated with the outside through the first vent hole and the second vent hole.

[0016] Preferably, a limiting protrusion is provided in an end of the second spiral away from the first connecting portion, and when the first connecting portion and the second connecting portion are completely installed, the first spiral and the limiting protrusion are in interference fit.

[0017] Preferably, the first spiral is configured as a protrusion, and an arc-shaped groove is further provided in the connecting hole, the arc-shaped groove is communicated with the second spiral, and a limiting protrusion is provided in the arc-shaped groove. When the first connecting part and the second connecting part are installed, the protrusion and the limiting protrusion are interfered with or the protrusion is limited between the limiting protrusion and the side wall of the arc-shaped groove.

[0018] A fascia gun comprises a main body and the above-mentioned massage head assembly, wherein the above-mentioned main body comprises a main shell, a battery, a motor and a drive assembly, the above-mentioned battery and the above-mentioned motor are arranged in the above-mentioned main shell and are electrically connected, and the output shaft of the above-mentioned motor is connected to an end of a connecting rod in the above-mentioned massage head assembly away from the above-mentioned massage head through the above-mentioned drive assembly.

[0019] Preferably, the main shell includes a head cover, an upper shell, a lower shell, a tail cover and a handle shell, the lower shell is arranged above the handle shell, the upper shell and the lower shell are connected to form a main cavity, the front end and the rear end of the main cavity are provided with through holes, the head cover is connected to the through hole at the front end of the main cavity, and the tail cover is arranged at the through hole at the rear end of the main cavity; the upper shell is convex to form a hump just above the motor, the hump includes a front slope and a rear slope, the front slope is sequentially provided with a plurality of transverse heat dissipation holes for heat dissipation along the projection line of the transverse axis of the main cavity on the front slope, and the rear slope is provided with a plurality of longitudinal heat dissipation holes for heat dissipation along the direction perpendicular to the projection line of the transverse axis of the main cavity on the rear slope.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The first connecting part and the second connecting part of the massage head rotate relatively and are connected through the first spiral and the first spiral to realize the connection between the massage head and the piston, which plays the role of threaded connection and can play the role of circumferential and axial limiting to a large extent. Compared with direct interference fit connection, the threaded connection method is more stable and easier to install and disassemble.

[0022] 2. By setting the elastic fixing part, when the massage head and the piston are connected, the elastic fixing part is arranged between the outer wall of the first connecting part and the connecting hole, so that the connecting part and the connecting hole are interference connected, which can play the role of anti-slip, shock absorption, sealing and easy disassembly. In addition, the elastic fixing part is arranged circumferentially, which can largely avoid the connection from being easily worn or even bent during use, thereby extending the service life of the connecting part and the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of the overall explosion of the massage head assembly in Embodiment 1 of the present utility model;

[0025] Figure 2 This is a schematic diagram of a blocking plate in Embodiment 1 of the massage head assembly of the present utility model;

[0026] Figure 3 This is a schematic diagram of the installation column in the massage head assembly embodiment 1 of the present utility model;

[0027] Figure 4This is a schematic diagram of the connection part of the massage head assembly embodiment 2 of the present utility model;

[0028] Figure 5 The massage head assembly of the utility model is shown as a whole in the fourth embodiment. Figure 1 ;

[0029] Figure 6 The massage head assembly of the utility model is shown as a whole in the fourth embodiment. Figure 2 ;

[0030] Figure 7 The massage head assembly of the utility model is shown as a whole in the fourth embodiment. Figure 3 ;

[0031] Figure 8 The massage head assembly of the utility model is shown as a whole in Example 5. Figure 1 ;

[0032] Fig. 9 The massage head assembly of the utility model is shown as a whole in Example 5. Figure 2 ;

[0033] Fig.10 This is an overall schematic diagram of the massage head assembly embodiment 6 of the present utility model;

[0034] Fig.11 This is a schematic diagram of the connection holes in the massage head assembly embodiment 6 of the present utility model;

[0035] Fig.12 This is an overall schematic diagram of a massage head assembly in Embodiment 7 of the present utility model;

[0036] Fig.13 This is a schematic diagram of the connection holes in the massage head assembly embodiment 7 of the present utility model;

[0037] Fig.14 This is a schematic diagram of a triangular prism structure of the first connecting column, the limiting groove, the elastic fixing portion and the connecting hole in the massage head assembly embodiment 8 of the utility model;

[0038] Fig.15 This is a schematic diagram of a square column structure in which the first connecting column, the limiting groove, the elastic fixing portion and the connecting hole in the massage head assembly embodiment 8 of the utility model are square columns;

[0039] Fig.16 This is a schematic diagram of a cross-column structure in which the first connecting column, the limiting groove, the elastic fixing portion and the connecting hole in the massage head assembly embodiment 8 of the utility model are formed;

[0040] Fig.17 For the embodiment of the utility model Fig.16 Schematic diagram of the middle cross column;

[0041] Fig.18 The utility model is a schematic diagram of the fascia gun Figure 1 ;

[0042] Fig.19 The utility model is a schematic diagram of the fascia gun Figure 2 ;

[0043] Fig. 20 This is an overall cross-sectional view of the fascia gun in the utility model;

[0044] Fig.21 This is a schematic diagram of the fascia gun of the utility model (excluding the upper cover);

[0045] Fig. 22 This is a schematic diagram of the inner head cover of the fascia gun in the utility model Figure 1 ;

[0046] Fig.23 This is a schematic diagram of the inner head cover of the fascia gun in the utility model Figure 2 ;

[0047] Fig.24 This is a schematic diagram of the cooperation between the head cover and the piston in the utility model;

[0048] Fig.25 This is a schematic diagram of the upper housing of the fascia gun of the utility model;

[0049] Fig.26 This is a top view of the upper shell of the fascia gun of the utility model;

[0050] Fig. 27 This is a size and position diagram of the hump on the upper shell of the utility model;

[0051] Fig.28 The lower shell of the fascia gun in the utility model is shown in FIG. Figure 1 ;

[0052] Fig.29 For the utility model Fig.28 A is an enlarged schematic diagram;

[0053] Fig.30 The lower shell of the fascia gun in the utility model is shown in FIG. Figure 2 ;

[0054] Fig.31 For the utility model Fig.30 A magnified schematic diagram of B;

[0055] Fig.32 This is a schematic diagram of the shock absorbing component in the utility model;

[0056] Fig.33 This is a bottom view of the handle shell and battery in the utility model;

[0057] Fig.34 This is a top view of the handle shell and battery in the utility model.

[0058] Description of reference numerals:

[0059] 1. Massage head; 1001. Striking part; 2. Connecting part; 201. Boss; 202. First connecting column; 203. Second connecting column; 204. Connecting hole; 205. Elastic fixing part; 206. Elastic abutting part; 207. Limiting groove; 208. Arc groove; 3. Piston; 4. First spiral; 5. Second spiral; 6. Blocking plate; 61. First vent hole; 62. Positioning column; 7. Connecting rod; 8. Mounting column; 81. First mounting groove; 82. Positioning hole; 83. Second vent hole; 9. First internal thread; 10. First external thread; 11. Bump; 12. Spiral groove; 13. Limiting protrusion; 14. Limiting plate; 15. Shock-absorbing structure; 151. Hard ball; 152. Soft buffer part; 16. Fixing ring;

[0060] 17. Upper shell; 171. Limiting column; 172. Upper connecting column; 173. Sealing edge; 174. Display structure mounting groove; 175. Upper baffle; 18. Lower shell; 181. Head cover connecting ring; 182. Annular mounting groove; 183. Head cover connecting hole; 184. Upper cover limiting groove; 185. Second mounting groove; 186. Lower connecting column; 1861. Mounting wall; 1862. Connecting groove; 1863. Lower connecting hole; 187. Sealing groove; 188. Lower baffle; 19. Head cover; 191. Third connecting column; 192. Annular groove; 193. Annular boss; 194. Reinforcement plate; 195. Wear-resistant ring; 196. Fourth connecting column; 197. Fastening 1. Components; 20. Hump; 2001. Horizontal heat dissipation holes; 2002. Longitudinal heat dissipation holes; 2003. Semi-circular grooves; 21. Handle shell; 2111. Fixing plate; 2112. Battery supporting base; 2113. Charging board mounting column; 22. Battery; 23. Motor; 24. Motor fixing plate; 2411. Drive groove; 25. Insulating sleeve; 26. Shock-absorbing component; 2611. Avoidance groove; 2612. Accommodation groove; 2613. Wire groove; 27. Eccentric wheel; 28. Bearing; 29. ​​Annular convex edge; 30. Display control board; 31. Tail cover; 32. Display board; 33. Arc structure; 34. Bottom cover structure; 3411. Charging cover; 3412. Charging board. DETAILED DESCRIPTION

[0061] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0062] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0063] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] The utility model provides a massage head assembly, which is applied to a fascia gun, such as Figure 1 As shown, it specifically includes a massage head 1, a connecting part 2 and a piston 3. A connecting rod 7 is also provided in the fascia gun, and the piston 3 is connected to the connecting rod 7; wherein the massage head 1 has a striking part 1001, wherein the striking part 1001 is used for muscle massage, physical therapy and the like, wherein the shape of the striking part 1001 includes but is not limited to a cylindrical structure, a prismatic structure, a spherical structure, a wave structure, a flat structure, or a combination of multiple structures above; the piston 3 is connected to one end of the connecting rod 7, and the other end of the connecting rod 7 is connected to the driving end of the driving component in the fascia gun; the connecting part 2 is used to connect the piston 3 and the massage head 1, so that the driving component in the fascia gun can drive the connecting rod 7, and the connecting rod 7 will drive the piston 3 to reciprocate in a straight line, and the piston 3 drives the massage head 1 to reciprocate through the connecting part 2 to achieve massage.

[0065] Among them, there is a common problem in the fascia gun massage head in the existing massage head assembly, that is, the connection between the massage head 1 and the piston 3 is easy to shake after long-term use, resulting in unstable connection. This shaking not only affects the stability of the massage head 1, but also may cause discomfort to the user during use, and may even damage the fascia gun due to long-term use. The connection part 2 in the massage head assembly in this embodiment is used to connect the massage head 1 and the piston 3. The connection part 2 specifically includes a first connection part and a second connection part, one of which is connected to the massage head 1, and the other is connected to the piston 3. It should be noted that the connection here can be split and then fixed by structure or directly set as one piece. The first connecting part has a first spiral 4, and the second connecting part is provided with a connecting hole 204 for the first connecting part to enter. The connecting hole 204 has a second spiral 5 that cooperates with the first spiral 4. The first connecting part is inserted into the connecting hole 204 through the rotational connection of the first spiral 4 and the second spiral 5, so as to realize the detachable connection between the massage head 1 and the piston 3. It can be known that the first spiral 4 and the second spiral 5 both have corresponding protrusions and grooves that cooperate with each other. If both are continuous spiral structures, then the first spiral 4 can be regarded as an external thread and the second spiral 5 can be regarded as an internal thread. The two are connected by rotation to realize the connection between the massage head 1 and the piston 3. Therefore, the specific structure of the first spiral 4 and the specific structure of the second spiral 5 can be any as long as they can realize rotational cooperation to realize the rotational connection between the massage head 1 and the piston 3. The first spiral 4 and the second spiral 5 mentioned above are essentially equivalent to the threaded connection of the internal thread and the external thread. On the one hand, the fastening path of the threaded connection is longer and less likely to loosen. On the other hand, it makes it easier to disassemble the massage head 1 and the piston 3, which is convenient for maintenance and replacement.

[0066] Furthermore, in order to make the connection between the piston 3 and the massage head 1 more stable, the connecting part 2 also includes an elastic fixing part 205, wherein the elastic fixing part 205 is made of an elastic material, has elasticity, can be squeezed and stretched, and can be specifically a rubber sleeve; when the piston 3 is connected to the massage head 1, the first connecting part is located in the connecting hole 204, and the first spiral 4 is matched with the second spiral 5 for connection. At this time, the elastic fixing part 205 is located between the first connecting part and the connecting hole 204, so that the first connecting part and / or the second spiral 5 are interference connected, which specifically includes the following situations: the first situation: the elastic fixing part 205 is sleeved on the first connecting part except the first spiral The outer wall of the elastic fixing part 205 except where the spiral 4 is located is abutted against the inner wall of the connecting hole 204 except where the second spiral 5 is located, and the elastic fixing part 205 is squeezed, so that the first connecting part and the connecting hole 204 are indirectly interference connected; the second type: the elastic fixing part 205 is sleeved on the outer wall of the first connecting part except where the first spiral 4 is located, the outer wall of the elastic fixing part 205 is abutted against the protrusion of the second spiral 5, and the elastic fixing part 205 is squeezed, so that the first connecting part and the connecting hole 204 are indirectly interference connected; the third type: the elastic fixing part 205 is sleeved on the outer wall of the first connecting part except where the first spiral 4 is located The outer wall outside the outer portion, a part of the elastic fixing part 205 abuts against the protrusion of the second spiral 5, and the other part abuts against the inner wall of the connecting hole 204, and the elastic fixing part 205 is squeezed, so that the first connecting part and the connecting hole 204 are indirectly interference-connected; the fourth type: the elastic fixing part 205 is located on the inner wall of the connecting hole 204, the protrusion of the first spiral 4 abuts against the inner wall of the elastic fixing part 205, and the elastic fixing part 205 is squeezed, so that the first connecting part and the connecting hole 204 are indirectly interference-connected; in summary, the above four installation methods of the elastic fixing part 205 all make the first connecting part and the connecting hole 204 interference fit, on the one hand, The connection is sealed to prevent moisture, dust and other impurities from entering. On the other hand, friction can be used to further enhance the stability of the connection, and it can play a shock-absorbing role in the axial or circumferential direction, effectively reducing the impact and vibration generated by the massage head 1 during operation. In addition, the elastic fixing part 205 is circumferentially wrapped around the outer wall of the first connection, which can avoid the force of the human body on the gun body to a certain extent, making the connection easy to bend, protecting the connection from damage, and extending the service life of the connection. Furthermore, the softness of the elastic fixing part 205 makes it easier for the elastic fixing part 205 to detach from the first connection when it is disassembled, reducing friction and damage during disassembly.

[0067] The first connecting part includes a first connecting column 202 and a boss 201. The first spiral 4 is arranged on the first connecting column 202. The connecting part 2 also includes an elastic abutment 206. The elastic abutment 206 is made of elastic material, has elasticity, and can be squeezed. Specifically, it can be a rubber sleeve. When the massage head 1 is connected to the piston 3, the first connecting column 202 enters the connecting hole 204. At this time, the boss 201 is located outside the connecting hole 204. The elastic abutment 206 is sleeved on the outside of the first connecting column 202 and is located between the boss 201 and the second connecting part. The elastic abutment 206 is squeezed to fill the gap between the boss 201 and the second connecting part, so that the connection structure between the massage head 1 and the piston 3 is more compact, and the massage head 1 is limited axially and circumferentially to avoid shaking. It should be noted that the elastic fixing part 205 and the elastic abutment 206 can be separated and spaced apart, or they can be arranged as one body. It is preferably adopted as follows Figure 1 The structure shown.

[0068] In summary, the massage head 1 in the utility model is first connected by the first connecting part and the second connecting part, that is, the first spiral 4 and the second spiral 5 are rotatably connected, which plays the role of a threaded connection, and the connection method is more stable. Then, by setting the elastic fixing part 205, the two are interference connected when the first connecting part is installed in the connecting hole 204, which increases the friction force and enhances the connection stability. The wear between the connecting part 2 and the connecting hole 204 can be reduced. The elastic abutment part 206 is further provided to fill the connection gap between the first connecting part and the second connecting part, so that the structure of the connection is more compact, and the massage head 1 is limited axially and circumferentially to avoid shaking. Therefore, the cooperation of the three makes the connection between the massage head 1 and the piston 3 more stable, thereby increasing the service life of the massage head 1 and the user experience.

[0069] Specifically, the structure of the massage head assembly is as follows:

[0070] Example 1

[0071] like Figure 1-3As shown, the massage head assembly in this embodiment specifically includes a massage head 1, a connecting part 2 and a piston 3. A connecting rod 7 is also provided in the fascia gun, and the piston 3 is connected to the connecting rod 7, wherein the connecting part 2 includes a first connecting part and a second connecting part, the first connecting part includes a boss 201 and a first connecting column 202, the boss 201 is integrally fixedly connected or detachably connected to the side wall of the massage head 1 away from the striking part, and the first end of the first connecting column 202 is fixedly or detachably connected to the side wall of the boss 201 away from the massage head 1, wherein the above-mentioned detachable connection can be a bolt connection, wherein the massage head 1, the boss 201 and the first connecting column 202 are all coaxially arranged, wherein the boss 201 has a certain thickness, and the outer diameter is larger than the diameter of the first connecting column 202, and the second connecting part is close to the outer diameter of the end of the massage head 1, so that the connection between the first connecting column 202 and the massage head 1 can be made firmer, and the gap between the massage head 1 and the piston 3 can be reduced, the stability is enhanced, and it is also more beautiful; the first connecting column 202 is connected to the massage head 1, and the massage head 1 is connected to the piston 3. The outer peripheral side of the connecting column 202 has a first spiral 4, which has a certain length in the axial direction and preferably forms more than one circle of the first spiral. The second connecting part includes a second connecting column 203, which is connected to the piston 3. The side wall of the second connecting column 203 close to the massage head 1 is concave inward to form a connecting hole 204 coaxial with the piston 3. The connecting hole 204 has a second spiral 5 that cooperates with the first spiral 4, and the second spiral 5 has a certain length in the axial direction and forms at least one circle of the second spiral. Through the rotational cooperation of the first spiral 4 and the second spiral 5, the first connecting column 202 can be inserted into the connecting hole 204 to achieve a detachable connection between the first connecting part and the second connecting part; and the end of the first spiral 4 preferably extends to the end of the connecting hole 204 close to the massage head 1, and the end of the second spiral 5 preferably extends to the end of the connecting hole 204 close to the massage head 1, so that the shaking of the two can be reduced at the beginning of the connection, the damage of the thread can be prevented, and the connection firmness can be increased. It should be noted that the positions of the first connecting part and the second connecting part in the above description of this embodiment 1 can also be exchanged, that is, the boss 201 and the first connecting column 202 are connected to the piston 3, and the second connecting column 203 is connected to the massage head 3. This is another implementation method.

[0072] Preferably, in order to facilitate the insertion of the first connecting column 202 into the connecting hole 204 , the second end of the first connecting column 202 is provided with a rounded corner or a chamfered corner.

[0073] The first spiral 4 and the second spiral 5 both have a certain length in the axial direction, and the spiral threads can be trapezoidal threads. When the first spiral 4 includes multiple turns of spirals and the second spiral 5 includes multiple turns of spirals, then the first spiral 4 and the second spiral 5 both have corresponding protrusions and grooves. Preferably, the ratio of the width of the protrusion and the groove in the first spiral 4 is between 2 times and 5 times, and correspondingly, the protrusion and the groove of the second spiral 5 are set correspondingly to meet the rotational connection between the first spiral 4 and the second spiral 5. This setting has the following advantages: 1. Improving the carrying capacity of the massage head assembly: The wide spiral part can disperse the load, so that the massage head assembly is not easy to loosen or be damaged when subjected to greater pressure or tension, thereby improving the stability and carrying capacity of the massage head assembly; 2. Improving the anti-slip performance of the massage head assembly: The wide spiral can increase the friction between the first spiral and the second spiral, preventing the massage head from loosening or falling off due to vibration and other reasons during movement, thereby improving the anti-slip performance of the massage head assembly; 3. Convenient disassembly and assembly: The wide spiral makes it easier to align the massage head during disassembly and assembly, reduces the difficulty of operation, and improves work efficiency; 4. Enhance the aesthetics of the massage head assembly: The design of the wide spiral can make the surface of the massage head assembly look more beautiful, thereby improving the overall appearance quality of the product.

[0074] Correspondingly, the connecting part 2 also includes a limiting member, which includes an elastic fixing part 205 and an elastic abutting part 206. The elastic fixing part 205 and the elastic abutting part 206 are coaxially arranged, and the elastic abutting part 206 is arranged at the end of the elastic fixing part 205 and the two are integrally formed. Correspondingly, a limiting groove 207 is circumferentially arranged at the end of the first connecting column 202 close to the boss 201. The elastic fixing part 205 and the elastic abutting part 206 are both sleeve structures. When installed, they are sleeved on the outer peripheral side of the limiting groove 207, which can axially limit the elastic fixing part 205 and the elastic abutting part 206. Preferably, the axial length of the limiting member formed by the elastic fixing part 205 and the elastic abutting part 206 does not exceed and is close to the axial length of the limiting groove 207, and the length error between the two does not exceed 0.1 cm; specifically, the outer diameter of the elastic fixing part 205 is not less than the inner groove of the second spiral 5 The outer diameter of the elastic abutment portion 206 is larger than the aperture of the connecting hole 204, and preferably the two are equal, so that when the massage head 1 is connected to the piston 3, the first connecting column 202 is screwed into the connecting hole 204 through the rotational connection of the first spiral 4 and the second spiral 5. At this time, the elastic fixing portion 205 is located between the outer wall of the limiting groove 207 and the second spiral 5, and is squeezed by the protrusion of the second spiral 5, filling the matching gap between the protrusion of the second spiral 5 and the limiting groove 207, so that the first connecting column 202 and the connecting hole 204 are indirectly interference fit, so that the connecting hole 204 forms a sealed space to prevent impurities such as moisture and dust from entering, and at the same time, the friction between the connecting hole 204 and the first connecting column 202 is significantly enhanced. At this time, the elastic abutment portion 206 is located outside the connecting hole 204 and between the boss 201 and the second connecting column 203, and is squeezed. Preferably, the top of the elastic fixing portion 205 facing the connecting hole 204 can be appropriately designed to be chamfered or rounded, and / or the opening of the connecting hole 204 can be flared or chamfered or rounded, which makes it easier for the elastic fixing portion 205 to be inserted into the connecting hole 204.

[0075] In this embodiment, the first connection part is fixed to the massage head, and the second connection part is fixed to the piston. Accordingly, the second connection column 203 is integrally arranged with the piston 3. The second connection column 203 is located at the end of the piston 3 close to the massage head 1, and the connection hole 204 runs through the entire piston 3. Specifically, the two ends of the piston 3 have different diameters to form a step, and a circumferential ring-shaped limiting plate 14 is also formed at the step. The end of the piston 3 away from the massage head 1 is provided with a shock-absorbing structure 15, which can be installed in the fascia gun to offset the lateral shaking of the connecting rod during operation. The connecting rod 7 is used to drive the piston 3. In this embodiment, the first end of the connecting rod 7 is connected to the driving assembly of the fascia gun, and the second end is provided with a mounting column 8. The side wall of the mounting column 8 near the massage head 1 is provided with a first mounting groove 81. In order to facilitate the end of the piston 3 away from the massage head 1 to be installed in the first mounting groove 81, a blocking plate 6 is provided at the end of the piston 3 away from the massage head 1. The blocking plate 6 is used to close the connection hole 204. When connected, the end of the piston 3 away from the massage head 1 is installed in the first mounting groove 81. The blocking plate 6 is connected to the bottom of the first mounting groove 81 by bolts. At this time, the two side walls of the shock absorbing structure 15 are respectively abutted by the limiting plate 14 and the side wall of the mounting column 8, and are clamped in the middle. The blocking plate 6 is provided with a first mounting hole, and the corresponding bottom of the first mounting groove 81 is provided with a corresponding threaded hole. The blocking plate 6 is connected to the bottom of the first mounting groove 81 by bolts. Of course, the threaded hole provided at the bottom of the first mounting groove 81 can also be a light hole. When fixed with screws or bolts, the threads of the screws or bolts rotate on the surface of the hole to form threads.

[0076] Moreover, when the first connecting column 202 is screwed into the connecting hole 204, due to the sealing effect of the elastic fixing part 205, the air in the connecting hole 204 is squeezed, and the air pressure in the connecting hole 204 will increase. In order to facilitate the first connecting column 202 to be smoothly screwed into the connecting hole 204, a first air vent 61 is opened at the bottom of the blocking plate 6, and correspondingly, a second air vent 83 is arranged at the bottom of the first mounting groove 81. The first air vent 61 and the second air hole are positioned at the same position and are preferably arranged relative to each other along the length direction of the fascia gun. During the process of the end of the piston 3 being installed in the first mounting groove 81, the air in the connecting hole 205 can be discharged through the first air vent 61 and the second air vent 83. After the piston 3 is installed, during the process of the first connecting column 202 being screwed into the connecting hole 204, the air in the connecting hole 204 can be discharged to the external environment through the first air vent 61 and the second air vent 83, so as to facilitate the first connecting column 202 to be screwed into the connecting hole 204. Of course, the first vent hole 61 can also be set on the hole wall of the connecting hole 204, as long as it is connected to the outside, and the corresponding second connecting hole 204 must also be set accordingly to ensure that the connecting hole 204 and the second connecting hole 204 can be connected after the piston 3 is installed.

[0077] Preferably, at least one positioning column 62 is provided on the side wall of the blocking plate 6 away from the massage head 1, and a corresponding number of positioning holes 82 are provided in the corresponding first mounting groove 81. During installation, the positioning column 62 is installed in the corresponding positioning hole 82 to achieve the positioning installation of the piston 3. The positioning column 62 also has a circumferential limiting function to prevent the piston 3 from circumferentially rotating in the first mounting groove 81, so that the installation of the piston 3 and the connecting rod 7 is more stable.

[0078] Correspondingly, the shock absorbing structure 15 specifically includes a hard ball 151 and a soft buffer part 152. The soft buffer part 152 is sleeved on the piston 3. The hard ball 151 is rollingly embedded in the soft buffer part 152 and partially protrudes from the outer wall of the soft buffer part 152. The soft buffer part 152 is an elastic sleeve with good shock absorbing effect, low cost and easy to obtain. Specifically, the outer periphery of the elastic sleeve is provided with a ball mounting groove for mounting the hard ball 151. The hard ball 151 is rollingly set in the ball mounting groove, and the area of ​​the hard ball 151 exposed in the ball mounting groove is not larger than the area in the ball mounting groove, so as to prevent the hard ball 151 from escaping from the ball mounting groove.

[0079] Specifically, the elastic sleeve is a split structure, including a first section and a second section, the first section is provided with a first half groove, the second section is provided with a second half groove, the first half groove and the second half groove form a ball mounting groove, which is convenient for the installation of the hard ball 151, and the first section and the second section can be fixed by bonding, and can be fixed together under the action of the mounting structure. Of course, in other embodiments, the elastic sleeve is an integrated structure, and the ball mounting groove is a deformable structure. When the hard ball 151 needs to be embedded in the ball mounting groove, force is applied to enlarge the notch of the ball mounting groove. After the hard ball 151 is inserted, the notch of the ball mounting groove automatically shrinks, thereby restricting the hard ball 151 in the ball mounting groove.

[0080] Example 2

[0081] like Figure 4 As shown, the difference between this embodiment and embodiment 1 is that the limiting member only includes the elastic fixing portion 205, the inner diameter of the elastic fixing portion 205 does not exceed the large diameter D2 of the protrusion inside the first spiral 4, and correspondingly, the connecting column in this embodiment is not provided with a limiting groove 207.

[0082] Specifically, the elastic fixing portion 205 in this embodiment is arranged at the end of the connecting hole 204 away from the massage head 1. When the first connecting column 202 is installed in the connecting hole 204, after the first spiral 4 and the second spiral 5 cooperate, the first spiral 4 at the end of the first connecting column 202 away from the massage head 1 will be inserted into the elastic fixing portion 205, so that the elastic fixing portion 205 will be squeezed, indirectly making the end of the first connecting column 202 away from the massage head 1 and the end of the connecting hole 204 away from the massage head 1 interference connected; the difference from Example 1 is that in this embodiment, the end of the first connecting column 202 away from the massage head 1 and the end of the connecting hole 204 away from the massage head 1 are interference connected through the elastic fixing portion 205, while in Example 1, the end of the first connecting column 202 away from the massage head 1 and the end of the connecting hole 204 close to the massage head 1 are interference connected through the elastic fixing portion 205.

[0083] Example 3

[0084] The difference between this embodiment and embodiment 1 is that the limiting member only includes the elastic abutment portion 206. After installation, the elastic abutment portion 206 is located between the boss 201 and the second connecting column 203, and the elastic abutment portion 206 is squeezed, thereby being able to reduce the shaking between the massage head 1 and the piston 3 to a certain extent.

[0085] Example 4

[0086] like Figure 5-7As shown, the massage head assembly in this embodiment specifically includes a massage head 1, a connecting part 2, and a piston 3. The piston 3 is connected to a connecting rod 7 in a driving mechanism in the fascia gun, wherein the connecting part 2 includes a first connecting part and a second connecting part. The first connecting part includes a first connecting column 202 and a boss. In this embodiment, the first connecting column 202 is arranged at one end of the piston 3 close to the massage head 1 and is integrally formed. The outer wall of the piston 3 is threadedly connected with a fixing ring 16. The outer diameter of the fixing ring 16 is greater than the outer diameter of the first connecting column 202. When the fixing ring 16 is threadedly connected to the outer wall of the piston 3, it is equivalent to the above-mentioned boss. The outer wall of the first connecting column 202 is formed with a first spiral 4, which is configured as a first external thread 10 in this embodiment. The first external thread 10 extends to the end side wall of the first connecting column 202 close to the massage head 1; the second connecting part includes a second connecting column 203, and the second connecting column 203 is connected to the massage head 1. The side wall away from the massage head 1 is concave to form a connecting hole 204 coaxial with the second connecting column 203. The connecting hole 204 is provided with a second spiral 5, which is configured as a first internal thread 9 in this embodiment. The first internal thread 9 does not extend to the end side wall of the connecting hole 204 away from the massage head 1. The end of the connecting hole 204 away from the massage head 1 is a light hole, the diameter of the light hole is larger than the minor diameter of the first internal thread 9, and the outer diameter of the elastic fixing part 205 is not less than the aperture of the light hole. When the massage head 1 is connected with the piston 3, it is only necessary to insert the end of the first connecting column 202 close to the massage head 1 into the connecting hole 204, and connect the first external thread 10 and the first internal thread 9 together. At this time, the fixing ring 16 is in contact with the outer side wall of the second connecting column 203, and the elastic fixing part 205 is located between the outer side wall of the limiting groove 207 and the light hole, and is squeezed by the side wall of the light hole, thereby filling the matching gap between the light hole and the limiting groove 207.

[0087] Moreover, the connecting portion 2 further comprises a limiting member, which comprises an elastic fixing portion 205 and an elastic abutting portion 206, the elastic fixing portion 205 and the elastic abutting portion 206 are coaxially arranged, the elastic abutting portion 206 is arranged at the end of the elastic fixing portion 205 and the two are integrally formed, correspondingly, the fixing ring 16 and the first external thread 10 are arranged at intervals, and a limiting groove 207 is arranged on the outer side wall of the piston 3 between the first external thread 10 and the fixing ring 16; during installation, the limiting member is sleeved on the outer peripheral side of the limiting groove 207, and the elastic fixing portion 205 and the elastic abutting portion 206 can be axially limited. Preferably, the axial length of the limiting member formed by the elastic fixing portion 205 and the elastic abutting portion 206 is equal to the axial length of the limiting groove 207, and the length error between the two does not exceed 0.1 cm Specifically, the outer diameter of the elastic fixing portion 205 is not less than the minor diameter of the first internal thread 9, and the outer diameter of the elastic abutting portion 206 is equal to the aperture of the connecting hole 204, so that when the massage head 1 is connected to the piston 3, the elastic fixing portion 205 is located between the outer wall of the limiting groove 207 and the first internal thread 9, and is squeezed by the first internal thread 9, filling the matching gap between the first internal thread 9 and the limiting groove 207, so that the end of the piston 3 (the first connecting column 202) and the connecting hole 204 are indirectly interference fit, so that the connecting hole 204 forms a sealed space to prevent moisture, dust and other impurities from entering, and at the same time, the friction force at the connection is significantly enhanced. At this time, the elastic abutting portion 206 is located outside the connecting hole 204 and between the fixing ring 16 and the second connecting column 203, and is squeezed. In order to facilitate the insertion of the first connecting column 202 into the connecting hole 204, the end of the first connecting column 202 close to the massage head 1 is provided with a chamfer or a rounded corner; the top of the elastic fixing portion 205 facing the connecting hole 204 can be appropriately designed to be chamfered or rounded, and / or the opening of the connecting hole 204 is flared or provided with a chamfer or a rounded corner, which makes it easier for the elastic fixing portion 205 to be inserted into the connecting hole 204.

[0088] Of course, in another embodiment, the first internal thread 9 extends to the end side wall of the connecting hole 204 away from the massage head 1, and the outer diameter of the elastic fixing portion 205 is not less than the aperture of the light hole, so that when the massage head 1 is connected to the piston 3, the elastic fixing portion 205 is located between the outer side wall of the limiting groove 207 and the first internal thread 9, and is squeezed to fill the fitting gap between the first internal thread 9 and the limiting groove 207.

[0089] The first end of the connecting rod 7 is connected to the driving component in the driving mechanism, and the second end is provided with a mounting column 8. The end of the piston 3 away from the massage head 1 is fixedly connected to the mounting column 8, and the outer wall of the piston 3 is sleeved with a shock absorbing structure 15. The shock absorbing structure 15 of this embodiment is the same as the shock absorbing structure 15 in Example 1. When the connection is completed, the two side walls of the soft buffer part 152 in the shock absorbing structure 15 are respectively in contact with the mounting column 8 and the fixing ring 16.

[0090] Example 5

[0091] like Figure 8-9 As shown, compared with Example 4, there are the following differences: the entire connection hole 204 is a light hole, and the end of the first connection column 202 close to the massage head 1 is not provided with the first external thread 10, but a light column. When the massage head 1 and the piston 3 are connected together, it is only necessary to insert the end of the piston 3 close to the massage head 1 into the connection hole 204, and the elastic fixing part 205 in the corresponding limiting member will be located between the end hole side wall of the connection hole 204 away from the massage head 1 and the first connection column 202. It is also known that the major diameter of the elastic fixing part 205 is not greater than the hole diameter of the connection hole 204. The elastic fixing part 205 is squeezed and deformed, which indirectly makes the piston 3 and the connection hole 204 interference fit. Compared with directly making the piston 3 and the connection hole 204 interference fit, the first connection column 202 and the connection hole 204 are easier to install and disassemble. At this time, the elastic abutment part 206 is located between the fixing ring 16 and the second connection column 203, which is used to fill the gap between the two and play a role in shock absorption and limiting. In order to facilitate the insertion of the first connecting column 202 into the connecting hole 204 , the end of the piston 3 close to the massage head 1 is provided with a chamfer or a rounded corner.

[0092] Example 6

[0093] like Figure 10-11As shown, the massage head assembly in this embodiment specifically includes a massage head 1, a connecting part 2, and a piston 3. The piston 3 is connected to the connecting rod 7 in the driving mechanism of the fascia gun, wherein the connecting part 2 includes a first connecting part and a second connecting part. The first connecting part includes a first connecting column 202 and a boss 201, wherein the boss 201 is integrally fixedly connected or detachably connected to the side wall of the massage head 1 away from the striking part 1001, and the first end of the first connecting column 202 is fixedly or detachably connected to the side wall of the boss 201 away from the massage head 1, wherein the above-mentioned detachable connection can be a bolt connection, wherein the massage head 1, the boss 201 and the first connecting column 202 are all coaxially arranged, and the first spiral 4 on the first connecting column 202 is arranged to be smaller so that the first spiral 4 can be regarded as a bump 11 relative to the second spiral 5. The second connecting part includes a second connecting column 203, and the second connecting column 203 is arranged at one end of the piston 3 close to the massage head 1, and the second connecting column 203 is close to the side wall of the massage head 1. The inner depression forms a connecting hole 204, wherein a second spiral 5 is formed in the connecting hole 204, and the second spiral 5 extends to the end side wall of the connecting hole 204 close to the massage head 1, and the protrusion 11 can move in the second spiral 5, and a limiting protrusion 13 matching with the protrusion 11 is provided at the end portion of the groove of the second spiral 5, wherein the setting position of the limiting protrusion 13 includes two situations, wherein the setting position of the limiting protrusion 13 includes two situations, the first situation is that the position of the limiting protrusion 13 is spaced apart from the bottom side wall of the end of the second spiral 5, so that the limiting protrusion 13 and the end side wall of the second spiral 5 form a storage space for accommodating the protrusion 11, when the massage head 1 is connected with the piston 3, the protrusion 11 moves to the end in the second spiral 5 and passes over the limiting protrusion 13 and is finally located in the storage space; the second situation is that the limiting protrusion 13 is arranged at the bottom side wall of the end of the second spiral 5, when the massage head 1 is connected with the piston 3, the protrusion 11 moves to the end in the second spiral 5 and is located between the limiting protrusion 13 and the side groove wall of the second spiral 5. Of course, in this embodiment, the second spiral 5 is a spiral groove 12 .

[0094] The connecting portion 2 also includes a limiting member, which includes an elastic fixing portion 205 and an elastic abutting portion 206. The elastic fixing portion 205 and the elastic abutting portion 206 are coaxially arranged, and the elastic abutting portion 206 is arranged at the end of the elastic fixing portion 205 and the two are integrally formed. Correspondingly, a limiting groove 207 is circumferentially arranged at the end of the first connecting column 202 close to the boss 201. The elastic fixing portion 205 and the elastic abutting portion 206 are both sleeve structures. During installation, the limiting member is sleeved on the outer peripheral side of the limiting groove 207, which can axially limit the elastic fixing portion 205 and the elastic abutting portion 206. Preferably, the axial length of the limiting member formed by the elastic fixing portion 205 and the elastic abutting portion 206 is equal to the axial length of the limiting groove 207, and the length error between the two does not exceed 0.1 cm; Specifically, the outer diameter of the elastic fixing portion 205 is not less than the minor diameter of the second spiral 5, and the outer diameter of the elastic abutting portion 206 is not less than the aperture of the connecting hole 204. Therefore, when the massage head 1 is connected to the piston 3, the elastic fixing portion 205 is located between the outer wall of the limiting groove 207 and the groove of the second spiral 5, and is squeezed, filling the matching gap between the second spiral 5 and the limiting groove 207, so that the first connecting column 202 and the connecting hole 204 have an indirect interference fit, so that the connecting hole 204 forms a sealed space to prevent moisture, dust and other impurities from entering, and at the same time, the friction between the connecting hole 204 and the first connecting column 202 is significantly enhanced. At this time, the elastic abutting portion 206 is located outside the connecting hole 204 and between the boss 201 and the second connecting column 203, and is squeezed. The top of the elastic fixing portion 205 facing the connecting hole 204 can be appropriately designed to be chamfered or rounded, and / or the opening of the connecting hole 204 can be flared or chamfered or rounded, which makes it easier for the elastic fixing portion 205 to be inserted into the connecting hole 204.

[0095] The specific connection structure between the connecting rod 7 and the piston 3 in this embodiment is the same as the connection structure between the connecting rod 7 and the piston 3 in the massage head assembly in Example 1 and is not repeated here. Similarly, the outer wall of the piston 3 is provided with a shock-absorbing structure 15. The installation position and specific structure of the shock-absorbing structure 15 in this embodiment are also as described in Example 1.

[0096] As another practicable method, the first spiral 4 and the second spiral 5 are both configured as spirals of more than one turn, and a limiting protrusion 13 is provided on the inner wall of the end of the first spiral 4 and / or the second spiral 5 away from each other. When the massage head 1 is installed on the piston 3, the corresponding second spiral 5 and / or the first spiral 4 interfere with the limiting protrusion 13, thereby further improving the stability of the installation of the massage head 1.

[0097] Example 7

[0098] like Figure 12-13As shown, the difference between this embodiment and embodiment 6 is that in this embodiment, the outer side wall of the end of the second connecting column 203 away from the massage head 1 is provided with an arc-shaped groove 208 connected to the end of the second spiral 5 in the connecting hole 204, wherein the limiting protrusion 13 is preferably arranged at the end of the arc-shaped groove 208, wherein the setting position of the limiting protrusion 13 in the arc-shaped groove 208 also has two situations, the first one is that the position of the limiting protrusion 13 is spaced between the bottom side wall of the end of the arc-shaped groove 208, so that the limiting protrusion 13 and the end side wall of the arc-shaped groove 208 form The first type is a storage space capable of accommodating the protrusion 11. When the massage head 1 is connected to the piston 3, the protrusion 11 moves to the end in the second spiral 5, and finally enters the arc-shaped groove 208, passes the limiting protrusion 13, and is finally located in the storage space; the second type is that the limiting protrusion 13 is arranged at the bottom side wall at the end of the arc-shaped groove 208. When the massage head 1 is connected to the piston 3, the protrusion 11 moves to the end in the second spiral 5, and finally enters the arc-shaped groove 208, and is located between the limiting protrusion 13 and the side groove wall of the arc-shaped groove 208, and is fixed by interference connection.

[0099] Example 8

[0100] like Figure 14-17 As shown, the massage head assembly in this embodiment includes a massage head 1, a connecting part 2, and a piston 3. The piston is connected to the connecting rod 7 of the fascia gun. The connecting part 2 includes a first connecting part, a second connecting part and a limiting member, wherein the first connecting part includes a boss 201 and a first connecting column 202, the second connecting part includes a second connecting column 203, and the limiting member includes an elastic fixing part 205 and an elastic abutting part 206. The connection method and structure of each component in this embodiment are different from those in Example 1 only in that: the first connecting column 202 is not provided with a first spiral 4, the connecting hole 204 is not provided with a second spiral, and the setting shapes of the first connecting column 202, the limiting groove 207, the elastic fixing part 205 and the connecting hole 204 are different, resulting in a different connection relationship, and the rest are the same, see the above-mentioned Example 1 for details, for example, the connection structure of the connecting rod 7 and the piston 3 is the same.

[0101] Specifically, the first connecting column 202, the limiting groove 207, the elastic fixing part 205 and the connecting hole 204 all have a mutual matching relationship. In Example 1, the first connecting column 202, the limiting groove 207, the elastic fixing part 205 and the connecting hole 204 are all cylindrical, while in this embodiment, the first connecting column 202, the limiting groove 207, the elastic fixing part 205 and the connecting hole 204 can be set as a prism, a square column or a cross column, and the first connecting column 202 and the connecting hole 204 are also changed to directly insert the first connecting column 202 into the connecting hole 204.

[0102] Specifically, when the first connecting column 202, the limiting groove 207, the elastic fixing portion 205 and the connecting hole 204 are configured as prisms, the prisms may be triangular prisms, quadrangular prisms or octagonal prisms, etc., and the sides of the prisms are of equal length. Fig.14 As shown, in this embodiment, the first connecting column 202, the limiting groove 207, the elastic fixing portion 205 and the connecting hole 204 are all set as triangular prisms. For example, the first connecting column 202 is set as a triangular prism, and the outer side wall of one end of the first connecting column 202 close to the boss 201 is provided with a triangular prism-shaped limiting groove 207. The limiting groove 207 is set at the connection between the boss 201 and the first connecting column 202, and has a certain axial width. The elastic fixing portion 205 and the elastic abutting portion 206 are both provided with a triangular prism-shaped inner hole. When stationary, the limiting piece is sleeved on the outer peripheral side of the limiting groove 207, and the limiting groove 207 limits the limiting piece on the first connecting column 202 to prevent the limiting piece from falling off; wherein the outer shape of the elastic fixing portion 205 is The elastic fixing portion 205 is arranged in a triangular prism shape, and the outer dimension of the elastic fixing portion 205 is not less than the outer dimension of the first connecting column 202, and is larger than the dimension of the connecting hole 204, so that when the piston 3 is connected to the massage head 1, the elastic fixing portion 205 can be located between the first connecting column 202 and the connecting hole 204, forming an interference connection, so that the surface friction between the first connecting column 202 and the connecting hole 204 is significantly enhanced, and the massage head 1 can be firmly fixed in the connecting hole 204; and more preferably, the top of the elastic fixing portion 205 facing the connecting hole 204 can be appropriately designed to be chamfered or rounded, and / or the opening of the connecting hole 204 is flared or chamfered or rounded, which makes it easier for the elastic fixing portion 205 to be inserted into the connecting hole 204. More preferably, the error between the external dimensions of the elastic fixing part 205 and the external dimensions of the first connecting column 202, and the error between the external dimensions of the elastic fixing part 205 and the dimensions of the connecting hole 204 do not exceed 0.1 cm. This error dimension setting can facilitate the elastic fixing part 205 to be inserted into the connecting hole 204 of the piston 3 and prevent the piston 3 from falling off.

[0103] Specifically, Fig.15As shown, when the first connecting column 202, the limiting groove 207, the elastic fixing part 205 and the connecting hole 204 are set as a square column, the four sides of the square column are of equal length. The first connecting column 202 is set as a square column, and the outer side wall of one end of the first connecting column 202 close to the boss 201 is provided with a limiting groove 207 in the shape of a square column. The limiting groove 207 is set at the connection between the boss 201 and the first connecting column 202, and has a certain axial width. The elastic fixing part 205 and the elastic abutment part 206 are both provided with an inner hole in the shape of a square column. When stationary, the limiting piece is sleeved on the outer peripheral side of the limiting groove 207, and the limiting groove 207 limits the limiting piece on the first connecting column 202 to prevent the limiting piece from falling off; wherein the outer shape of the elastic fixing part 205 is set as a square column shape, and the outer size of the elastic fixing part 205 is not small The elastic fixing part 205 is larger than the outer dimension of the first connecting column 202 and larger than the dimension of the connecting hole 204, so that when the piston 3 is connected to the massage head 1, the elastic fixing part 205 can be located between the first connecting column 202 and the connecting hole 204, forming an interference connection, so that the surface friction between the first connecting column 202 and the connecting hole 204 is significantly enhanced, and the massage head 1 and the piston 3 can be firmly fixed; and more preferably, the top of the elastic fixing part 205 facing the connecting hole 204 can be appropriately designed as a chamfer or a fillet, and / or the opening of the connecting hole 204 is flared or chamfered or filleted, so that it is easier for the elastic fixing part 205 to be inserted into the connecting hole 204. More preferably, the difference between the outer dimension of the elastic fixing part 205 and the outer dimension of the first connecting column 202 and the difference between the outer dimension of the elastic fixing part 205 and the dimension of the connecting hole 204 are both less than 0.1 cm, and this difference size setting can facilitate the elastic fixing part 205 to be inserted into the connecting hole 204 and prevent the first connecting column 202 from falling off.

[0104] Specifically, Figure 16-17As shown, when the first connecting column 202, the limiting groove 207, the elastic fixing part 205 and the connecting hole 204 are set as a cross column, as shown in the figure, the length of the a section of the cross column is half of the length of the b section, and the length of the b section is half of the length of the c section. The first connecting column 202 is set as a cross column, and the outer side wall of one end of the first connecting column 202 close to the boss 201 is provided with a limiting groove 207 in the shape of a cross column. The limiting groove 207 is set at the connection between the boss 201 and the first connecting column 202, and has a certain axial width. The elastic fixing part 205 and the elastic abutment part 206 are both provided with an inner hole in the shape of a cross column. When stationary, the limiting piece is sleeved on the outer peripheral side of the limiting groove 207, and the limiting groove 207 limits the limiting piece on the first connecting column 202 to prevent the limiting piece from falling off; wherein the outer shape of the elastic fixing part 205 is set as a cross column shape, and the outer size of the elastic fixing part 205 is not less than the first connecting column 202. The outer dimension of the first connecting column 202 is greater than the dimension of the connecting hole 204, so that when the piston 3 is connected to the massage head 1, the elastic fixing part 205 can be located between the first connecting column 202 and the connecting hole 204, forming an interference connection, so that the friction between the first connecting column 202 and the connecting hole 204 of the piston 3 is significantly enhanced, and the massage head 1 and the piston 3 can be firmly fixed; and more preferably, the top of the elastic fixing part 205 facing the connecting hole 204 can be appropriately designed as a chamfer or a fillet, and / or the opening of the connecting hole 204 is flared or chamfered or filleted, so that it is easier for the elastic fixing part 205 to be inserted into the connecting hole 204. More preferably, the difference between the outer dimension of the elastic fixing part 205 and the outer dimension of the first connecting column 202 and the difference between the outer dimension of the elastic fixing part 205 and the dimension of the connecting hole 204 are no more than 0.1 cm, and this difference size setting can facilitate the elastic fixing part 205 to be inserted into the connecting hole 204 of the piston 3 and prevent the piston 3 from falling off.

[0105] The utility model also discloses a fascia gun, such as Figure 18-21As shown, the fascia gun includes a main body and the above-mentioned massage head assembly, wherein the main body includes an outer shell and a battery 22, a motor 23 and a driving mechanism arranged in the outer shell, wherein the outer shell includes a head cover 19, a tail cover 31, an upper shell 17, a lower shell 18 and a handle shell 21, wherein the upper shell 17 and the lower shell 18 form a main cavity, the handle shell 21 is integrally connected to the lower side wall of the lower shell 18, and the handle shell 21 has a handle cavity. A first through hole is formed at the front end of the main cavity and a second through hole is formed at the rear end. A third through hole is provided on the head cover 19. The head cover 19 is connected to the first through hole, and the third through hole is coaxial with the first through hole. The upper end of the motor 23 is located in the main cavity, and the lower end of the motor 23 is arranged in the handle cavity. The output end of the motor 23 faces upward and is located in the main cavity. The output end of the motor 23 is connected to the drive assembly. The massage head assembly includes a massage head 1 and a connecting part 2. A piston 3, a shock absorbing structure 15 and a drive mechanism are also provided in the main cavity. The drive mechanism includes a drive assembly and a connecting rod 7. The massage head 1 is located outside the head cover 19, and the drive assembly is connected to one end of the connecting rod 7. The other end of the connecting rod 7 passes through the first through hole and is connected to the piston 3 located in the third through hole for reciprocating motion.

[0106] Specifically, Figure 22-31 The head cover 19 is an annular structure, the outer diameter of the front end of the head cover 19 is smaller than the outer diameter of the rear end, and the front end of the head cover 19 transitions to the rear end in an arc shape. A head cover connecting ring 181 is formed at the front end of the lower shell body 18, and an annular mounting groove 182 is formed at the front end of the head cover connecting ring 181. At least one head cover connecting hole 183 is provided on the annular mounting groove 182, and at least one third connecting column 191 with an internal thread is provided on the inner side wall of the rear end of the head cover 19. When connected, the rear end of the head cover 19 is inserted into the annular mounting groove 182 and then fixed by bolts; in order to facilitate the positioning and installation of the head cover 19, that is, the alignment of the head cover connecting hole 183 with the threaded hole, the outer diameter of the lower part of the head cover connecting ring 181 is larger than the outer diameter of the upper part, forming two external steps, and the inner diameter of the lower part is larger than the inner diameter of the upper part, thereby forming two internal steps, and the outer side wall of the upper end of the head cover 19 The outer diameter is smaller than the outer diameter of the outer wall of the lower part, and two steps are formed accordingly. Therefore, when the rear end of the head cover 19 is installed in the annular installation groove 182, the two steps formed at the rear end of the head cover 19 correspond to and abut against the two internal steps formed at the upper and lower parts of the head cover connecting ring 181, thereby determining the installation position of the head cover 19; and in order to facilitate the installation of the upper cover, an upper cover limiting groove 184 is provided at the steps formed by the upper and lower outer walls of the head cover connecting ring 181. Correspondingly, the inner diameter of the front end of the upper shell 17 is smaller than the inner diameter of the front end of the lower shell 18, and the outer diameters are equal. The lower side wall of the front end of the upper shell 17 is provided with a corresponding limiting column 171 that cooperates with the upper cover limiting groove 184. By inserting the limiting column 171 into the upper cover limiting groove 184, the upper shell 17 is installed in cooperation with the upper part of the head cover connecting ring 181, thereby realizing the cooperation installation of the upper shell 17 and the lower shell 18.

[0107] An annular groove 192 is provided on the inner wall of the front end of the head cover 19, and an annular boss 193 is provided on the front end of the annular groove 192. A radially and circumferentially distributed reinforcing plate 194 is formed between the annular groove 192 and the inner surface of the front end of the head cover 19, which is used to increase the strength of the annular groove 192 and prevent deformation during operation; when the installation is completed, the shock-absorbing structure 15 is arranged in the annular groove 192, and in order to reduce the wear between the shock-absorbing structure 15 in the massage component assembly and the groove wall of the annular groove 192, a wear-resistant ring 195 is arranged in the annular groove 192, and part of the reinforcing plate 194 is provided with a fourth connecting column 196 with a threaded hole. When in use, a fastener 197 is fixed on the fourth connecting column 196, and one side of the wear-resistant ring 195 is fixed by the fastener 197, while the other side of the wear-resistant ring 195 is limited by the annular boss 193; specifically, the fastener 197 can adopt a structure such as a large nut screw, and the wear-resistant ring 195 is fixed by the edge of the nut.

[0108] It should be noted that during installation, the front side of the wear-resistant ring 195 needs to be firstly abutted against the inner surface of the annular boss 193 at the front end of the head cover 19, and then the wear-resistant ring 195 is fixed in the annular groove 192 by the fastener 197. Subsequently, the rear end of the head cover 19 and the boss of the head cover connecting ring 181 are aligned and initially fixed, and the fastener 197 is driven from the head cover connecting hole 183 inside the fuselage into the threaded hole of the third connecting column 191 to fix the head cover 19. Then, the limit column 171 with a protruding setting at the bottom of the front end of the upper shell 17 is inserted into the upper cover limit groove 184 to achieve the snap connection between the upper shell 17 and the lower shell 18.

[0109] Specifically, the lower shell 18 further includes at least one second mounting groove 185 from the outer surface, and the second mounting groove 185 has a lower connecting hole 1863 that penetrates the lower shell 18. A lower connecting column 186 that extends vertically up and down is provided at a position on the inner surface of the lower shell 18 corresponding to the lower connecting hole 1863, and the lower connecting hole 1863 extends through the lower connecting column 186, and the end side wall of the lower connecting column 186 is provided with a connecting groove 1862 that is coaxial with the lower connecting hole 1863. The end side wall of the connecting groove 1862 extends outward to form a mounting wall 1861, and the inner diameter of the mounting wall 1861 gradually increases from the inside to the outside to form a tapered hole. Correspondingly, the upper shell 17 extends vertically downward from the inner surface of the shell to form an upper connecting column 172 with an upper connecting hole, and the number of the upper connecting columns 172 and the number of the lower connecting columns 186 Correspondingly, the outer diameter of the end of the upper connecting column 172 is slightly smaller than the inner diameter of the connecting groove 1862, so that during installation, the end of the upper connecting column 172 can be embedded in the connecting groove 1862 and abut against the bottom groove wall of the connecting groove 1862. The upper connecting hole is a screw hole. When the upper shell 17 and the lower shell 18 are connected, the bolt is inserted from the second installation groove 185 of the lower shell 18 to the lower connecting hole 1863 to the upper connecting hole, thereby connecting the upper shell 17 and the lower shell 18 together. After the upper shell 17 and the lower shell 18 are connected, the second installation groove 185 can be sealed with a sealing plug, which can play a role in waterproofing, dustproofing and protection; and for better connection, the sum of the lengths of the upper connecting column 172 and the lower connecting column 186 should be appropriate, so that the shells can fit perfectly when connected, and achieve limiting and pre-fixation during installation.

[0110] Furthermore, the upper shell 17 also has a continuous or segmented sealing edge 173 at the connection with the lower shell 18, and the lower shell 18 also has a sealing groove 187 corresponding to the sealing edge 173 at the connection with the upper shell 17. In other embodiments, the upper shell 17 also has a continuous or segmented sealing groove 187 at the connection with the lower shell 18, and the lower shell 18 also has a sealing edge 173 corresponding to the sealing groove 187 at the connection with the upper shell 17. When the two parts of the shell are installed, the sealing edge 173 can be embedded in the sealing groove 187 of the other side shell, so as to achieve sealing, and the two structures can achieve limiting and pre-fixing before screw fixing. In other embodiments, the sealing groove 187 and the sealing edge 173 can also be arranged in steps to further increase the sealing performance.

[0111] The upper shell 17 is convexly formed with a hump 20 just above the motor 23, and the entire hump 20 is located in front of the vertical line where the end of the handle shell 21 is located; in the side view of the present fascia gun, the entire upper half of the fascia gun has three steps, namely the zero-step where the head cover 19 is located, the second-step where the hump 20 is located, and the first-step between the head cover 19 and the hump 20 at the upper surface of the upper shell 17. The shell diameters of the zero-step, the first-step and the second-step are arranged in increasing order, and the hump 20 extends from the connection between the first-step and the second-step to the tail end of the fascia gun, forming a highest peak in the middle. Specifically, the highest peak is a front slope on one side toward the front end of the fascia gun, and a rear slope on the other side. The slope of the front slope is slightly gentler than that of the rear slope, and the entire hump 20 is located in front of the vertical line where the end of the handle shell 21 is located, and the connection between the front slope and the rear slope is arranged in an arc shape. The front slope of the hump 20 is provided with a plurality of transverse heat dissipation holes 2001 for heat dissipation in sequence along the projection line of the transverse axis of the main cavity on the front slope. In order to prevent the transverse heat dissipation holes 2001 from deforming during use, a plurality of semi-circular grooves 2003 are provided on the outer peripheral side of the transverse heat dissipation holes 2001 to increase the service life of the transverse heat dissipation holes 2001; and the rear slope is provided with a plurality of longitudinal heat dissipation holes 2002 along the projection line direction perpendicular to the transverse axis of the main cavity on the rear slope. The longitudinal heat dissipation holes are symmetrically arranged with the transverse axis of the main cavity as the central axis. The transverse heat dissipation holes 2001 and the longitudinal heat dissipation holes 2002 constitute a heat dissipation structure; and in this fascia gun, the distance from the outer surface of the upper shell 17 to the transverse axis of the main cavity is C, D, and C is 4.32 times of D. When the fascia gun is in operation, a large amount of heat will be generated in the main cavity, and the hot air will rise. The shape and height of the hump 20 are conducive to the accumulation of hot air, and the heat dissipation holes opened according to the above method have higher heat dissipation efficiency.

[0112] Specifically, the handle shell 21 has a handle cavity, and the battery 22 is entirely located in the handle cavity and at the lower part of the handle cavity. The inner surface of the handle cavity has a plurality of fixing plates 2111 extending toward the battery 22, wherein the battery 22 in this embodiment is a triangular battery pack with three arc-shaped corners when viewed from the bottom, and is formed by bundling three batteries. There are three fixing plates 2111, and each fixing plate 2111 abuts against the midline position of the three sides of the battery 22. A battery supporting base 2112 is arranged between every two adjacent fixing plates 2111, and the three battery supporting bases 2112 are respectively used to abut against the three rounded corners at the bottom of the battery 22, wherein the bottom of the fixing plate 2111 is not lower than the plane where the supporting base is located, and not higher than the plane where the lower surface of the motor 23 is located.

[0113] Specifically, the lower part of the motor 23 is located in the handle cavity and above the battery 22, and the upper part is located in the main cavity, wherein a motor fixing plate 24 for fixing the upper end of the motor 23 is provided in the main cavity, and a fixing hole is provided on the motor fixing plate 24, and a fixing column is extended upward from the bottom side wall of the lower shell 18, and the fixing hole of the motor fixing plate 24 is sleeved on the fixing column. The upper end of the battery 22 is fixed to the motor fixing plate 24 by bolts, wherein in this embodiment, the distance from the installation plane of the motor 23 (the plane where the motor fixing plate 24 is located) to the lower surface of the main cavity is E, and the distance from the lower surface of the motor 23 to the upper surface of the handle cavity is F. It can be seen that the ratio of the part of the motor 23 that exceeds the handle cavity and the part located in the handle cavity is about 1 / 4, that is, the ratio of E to F is about 1 / 4; preferably, during installation, the center lines of the battery 22 and the motor 23 are arranged in a colinear manner, which is conducive to reducing vibration when the fascia gun is running. Furthermore, since the lower end surface of the motor 23 has an output wire, which has a contact and is easy to fall off, an L-shaped insulating sleeve 25 is provided on the lower end surface of the battery 22 to protect it and play an insulating role. In order to improve the stability of the battery 22, a shock-absorbing member 26 is also provided in the gap between the battery 22 and the motor 23, such as Fig.32 As shown, the structure of the shock-absorbing member 26 is hollow inside, and a through hole is provided at the center of the middle circle. A convex edge is distributed around the through hole in an annular shape to enhance the stability of the through hole. The through hole is used for the protrusion at the bottom of the motor 23 to pass through, and the edge of the bottom of the shock-absorbing member 26 is recessed inward to form an avoidance groove 2611, which is used to make way for the fixing plate 2111 fixing the battery 22 below, so as to avoid the fixing plate 2111 and the bottom of the shock-absorbing member 26 from colliding when in use; and in order to facilitate the accommodation of the insulating sleeve 25, the interior of the shock-absorbing member 26 is also provided with a through accommodating groove 2612 to accommodate the insulating sleeve 25, and the outer convex edge of the shock-absorbing member 26 is formed with a notch, which is a wire groove 2613, which is convenient for the wire to pass through, making the wiring harness more neat. In another embodiment, the shock-absorbing member 26 can be a sponge.

[0114] Specifically, the driving assembly includes an eccentric wheel 27, and the upper end surface of the motor fixing plate 24 is provided with a driving groove 2411 corresponding to the installation of the eccentric wheel 27. The output shaft of the motor 23 passes through the motor fixing plate 24 and is connected with the eccentric wheel 27 in the driving groove 2411. The connecting rod 7 in the massage head assembly is provided with a driving hole at one end away from the massage head 1. A bearing 28 is provided in the driving hole. The bearing 28 is connected to the output shaft at the upper end of the eccentric wheel 27, thereby forming a complete transmission system, that is, the motor 23 drives the eccentric wheel 27, the eccentric wheel 27 drives the connecting rod 7 through the bearing 28, and the connecting rod 7 drives the piston 3 to slide in the annular groove 192, and at the same time, the shock absorbing structure 15 plays a corresponding shock absorbing role.

[0115] An annular flange 29 extends from the tail end formed by the upper shell 17 and the lower shell 18, and a tail cover 31 is sleeved on the outside of the annular flange 29, and a tail cover 31 connecting column with a threaded hole is provided on the inner wall of the annular flange 29. Correspondingly, a tail cover connecting hole corresponding to the inner threaded hole of the tail cover connecting column is provided on the outer wall of the tail cover 31. The tail cover 31 is connected to the annular flange 29 by bolts, and an upper baffle 175 extends inwardly from the inner wall of the tail end of the upper shell 17, and a lower baffle 188 extends inwardly from the inner wall of the tail end of the lower shell 18. The baffle formed by the upper baffle 175 and the lower baffle 188 can produce a partition to divide the two cavities, thereby preventing external debris or wires from entering the cavity where the transmission structure is located, thereby preventing malfunctions. After the upper shell 17 and the lower shell 18 are connected, a baffle is formed between the upper baffle 175 and the lower baffle 188 and has a wire hole. The display control board 30 is installed in the space between the baffle and the tail cover 31. The wire hole facilitates the electrical connection of the display control board 30 with components such as the battery 22 in the main body, and the baffle can limit the display control board 30 to be located in the tail cover 31.

[0116] Furthermore, a display board 32 is provided on the shell, wherein the display board 32 can be a logo board or an electronic display screen for displaying parameters such as temperature and rotation speed, so that the user can understand the usage status; specifically, a display structure mounting groove 174 is provided at the junction of the upper shell 17 and the lower shell 18, and the display structure mounting groove 174 is located directly above the handle shell 21. The upper groove wall of the display structure mounting groove 174 is provided with an axially distributed mounting ridge, so that a groove for mounting the display board is formed between the mounting ridge and the bottom groove wall of the display structure mounting groove 174, and correspondingly, the display board 32 is also provided with a corresponding ridge, and during installation, it is only necessary to align the display board 32 with the bottom groove wall of the display structure mounting groove 174. The corresponding convex edge is snapped into the groove, because the display structure mounting groove 174 is composed of the upper shell 17 and the lower shell 18, that is, the display structure mounting groove 174 is half located on the lower shell 18 and half located on the upper shell 17. First, the display card 32 is installed in the display structure mounting groove 174 of the lower shell 18, and then the upper shell 17 is installed. The convex edge of the display card 32 can be snapped into the groove, and then for the stability of the connection, a sealing ring can be provided at the connection between the display card 32 and the display structure mounting groove 174 to enhance the sealing of the connection, and it can be fixed by one or more methods such as bonding and snapping to better ensure the sealing of the connection.

[0117] The connection between the lower shell 18 of the fascia gun and the handle shell 21 is set as an arc structure 33, which can reduce the residual stains on the external shell, increase the aesthetics, and improve the grip. A polygonal area with a polygonal protrusion structure is also set below the arc structure 33. The end of the protrusion is chamfered or rounded to increase the safety factor and improve the hand-held grip. Preferably, the arc structure 33 can be made of sweat-absorbing and shock-absorbing materials. The space inside the arc structure 33 can be used to accommodate part of the motor 23.

[0118] Specifically, Figure 33-34 As shown, a bottom cover structure 34 is provided at the bottom of the handle shell 21, and the bottom cover structure 34 includes a charging cover 3411 and a charging plate 3412. The battery 22 is entirely located in the handle shell 21, and the charging plate 3412 and the charging cover 3411 are located at the bottom of the handle shell 21. A charging plate mounting groove is provided at the bottom of the handle shell 21 of the lower shell 18, and a charging plate mounting column 2113 is provided in the charging plate mounting groove. The charging plate mounting column 2113 is located behind the battery supporting base 2112, and a third mounting hole is provided at the top of the charging plate mounting column 2113. At the same time, a step is also provided on the outer surface of the top of the third mounting hole, and the step is used to abut the charging plate 3412. The charging plate 3412 is electrically connected to the battery 22, the display control board 30, and the motor 23. The charging plate 341 2 also has a charging port and a main switch, and protrudes outward. In addition, the charging plate 3412 is also provided with a mounting through hole corresponding to the charging plate mounting column 2113, which enables the charging plate 3412 to extend into the charging plate mounting column 2113 and abut against the step of the charging plate mounting column 2113. The outer diameter and inner diameter of the charging cover 3411 are consistent with the outer diameter and inner diameter of the handle shell 21, and a through hole corresponding to the charging port and the main switch is opened to accommodate the components, and the charging cover 3411 should also have a mounting through hole corresponding to the charging plate mounting column 2113; during installation, the fastener 197 is respectively passed through the mounting through hole of the charging cover 3411, the mounting through hole of the charging plate 3412 and the third mounting hole to complete the fixing of the structure. Preferably, a step structure can be provided at the end connection where the handle shell 21 and / or the charging cover 3411 are close to each other to enhance the sealing and waterproof properties.

[0119] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A massage head assembly, used in a fascia gun, characterized in that: It includes a massage head, a connecting part, and a piston connected to a driving mechanism in a fascia gun; The connecting part includes a first connecting part and a second connecting part, the second connecting part is provided with a connecting hole for the first connecting part to enter, one of the first connecting part and the second connecting part is fixed to the massage head, and the other is fixed to the piston, the first connecting part is provided with a first spiral, and the connecting hole is provided with a second spiral cooperating with the first spiral, and the massage head and the piston are detachably connected by the rotational connection of the second spiral and the first spiral.

2. The massage head assembly according to claim 1, characterized in that: It also includes a limiting member, wherein the limiting member includes an elastic fixing portion; The elastic fixing portion is arranged between the first connecting portion and the connecting hole, so that the first connecting portion is in interference connection with the connecting hole and / or the second spiral.

3. The massage head assembly according to claim 2, characterized in that: The first connecting portion includes a connecting column and a boss; the first spiral is arranged on the connecting column; When the massage head is connected to the piston, the connecting column is located in the connecting hole, and the boss is located outside the connecting hole and abuts against the end of the second connecting part.

4. The massage head assembly according to claim 3, characterized in that: The limiting member also includes an elastic abutment portion, which is connected to the end of the elastic fixing portion and the two are coaxial. The elastic abutment portion is sleeved on the outer peripheral side of the first connecting portion to fill the gap between the boss and the second connecting portion.

5. The massage head assembly according to claim 2, characterized in that: The first connecting portion is provided with a limiting groove in the circumference, the elastic fixing portion is sleeved in the limiting groove, and the outer diameter of the elastic fixing portion is not less than the minor diameter of the second spiral; or The elastic fixing portion is embedded in the connecting hole, and the inner diameter of the elastic fixing portion is not greater than the major diameter of the first spiral.

6. The massage head assembly according to any one of claims 1 to 5, characterized in that: The driving mechanism in the fascia gun includes a connecting rod. When the first connecting portion is arranged on the massage head and the second connecting portion is arranged on the piston, a first mounting groove is arranged on one end of the connecting rod facing the piston, the connecting hole extends and passes through the piston, a blocking plate is arranged on the end of the piston away from the massage head, the blocking plate is used to close the connecting hole, and the end of the piston away from the massage head is installed in the first mounting groove; The blocking plate has a first vent hole at the bottom, the first mounting groove has a second vent hole, and the connecting hole communicates with the outside through the first vent hole and the second vent hole.

7. The massage head assembly according to any one of claims 1 to 5, characterized in that: A limiting protrusion is provided in one end of the second spiral away from the first connecting portion. When the first connecting portion and the second connecting portion are installed, the first spiral and the limiting protrusion are in interference fit.

8. The massage head assembly according to any one of claims 1 to 5, characterized in that: The first spiral is configured as a protrusion, and an arc-shaped groove is further configured in the connecting hole. The arc-shaped groove is communicated with the second spiral, and a limiting protrusion is configured in the arc-shaped groove. When the first connecting part and the second connecting part are installed, the protrusion and the limiting protrusion are interfered with or the protrusion is limited between the limiting protrusion and the side wall of the arc-shaped groove.

9. A fascia gun, characterized in that: The massage head assembly comprises a main body and the massage head assembly as described in any one of claims 1 to 8, wherein the main body comprises a main shell, a battery, a motor and a drive assembly, the battery and the motor are arranged in the main shell and are electrically connected, and the output shaft of the motor is connected to an end of a connecting rod in the massage head assembly away from the massage head through the drive assembly.

10. The fascia gun according to claim 9, characterized in that: The main shell includes a head cover, an upper shell, a lower shell, a tail cover and a handle shell, the lower shell is arranged above the handle shell, the upper shell and the lower shell are connected to form a main cavity, the front end and the rear end of the main cavity are provided with through holes, the head cover is connected to the through hole at the front end of the main cavity, and the tail cover is arranged at the through hole at the rear end of the main cavity; the upper shell is convex to form a hump just above the motor, the hump includes a front slope and a rear slope, the front slope is provided with a plurality of transverse heat dissipation holes for heat dissipation in sequence along the projection line of the transverse axis of the main cavity on the front slope, and the rear slope is provided with a plurality of longitudinal heat dissipation holes for heat dissipation along the direction perpendicular to the projection line of the transverse axis of the main cavity on the rear slope.

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