Stroke adjusting device and fascia gun

Abstract

The utility model provides a stroke adjusting device and a fascia gun. The stroke adjusting device comprises a motor and a crank-link mechanism, the crank-link mechanism comprises an eccentric wheel, a connecting rod and a piston, an output shaft of the motor is connected to the eccentric wheel, one end of the connecting rod is connected with the piston, the crank-link mechanism further comprises an adjusting wheel and an adjusting rod, the adjusting wheel is eccentrically connected to the eccentric wheel, and the adjusting rod is eccentrically connected with the adjusting wheel. When the hinged center point of the adjusting rod and the connecting rod is located at different positions relative to the central axis of the adjusting wheel, the distances between the hinged center point of the adjusting rod and the connecting rod and the rotating axis of the eccentric wheel are different. The fascia gun comprises a fascia gun shell and a stroke adjusting device, a containing cavity is formed in the fascia gun shell, and at least part of the structure of the stroke adjusting device is located in the containing cavity. The stroke adjusting device can adjust the stroke in a large range and in a stepless mode in any working state, the stroke adjusting device can reduce the loss of the output striking force of the piston, and the working efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of fascia guns, and more particularly to a stroke adjustment device and a fascia gun. Background Technology

[0002] In daily work, exercise, or leisure activities, people often use fascia guns to relax muscles. Users aim the massage head of the fascia gun at the muscles that need relaxation, and the high-frequency reciprocating impact of the massage head helps the body relax muscles and relieve muscle fatigue. However, different muscle tissues in the human body require different massage depths, and most existing fascia guns have non-adjustable strokes. Therefore, they cannot use different massage depths for different muscle tissues. Furthermore, the structure of fascia guns with adjustable strokes will affect the working efficiency of the fascia gun, such as reducing the output impact force. Moreover, most of them have poor structural stability and reliability, reducing the user's experience and comfort when using the fascia gun. Utility Model Content

[0003] This application provides a stroke adjustment device and a fascia gun, which can solve at least some of the above-mentioned technical problems.

[0004] In a first aspect, this application provides a stroke regulating device, comprising:

[0005] Electric motor;

[0006] A crank-connecting rod mechanism, comprising an eccentric wheel, a connecting rod, and a piston, wherein the output shaft of the motor is connected to the eccentric wheel, and one end of the connecting rod is connected to the piston;

[0007] The crank-connecting rod mechanism further includes an adjusting wheel and an adjusting rod. The adjusting wheel is eccentrically connected to the eccentric wheel, the adjusting rod is eccentrically connected to the adjusting wheel, and the other end of the connecting rod is hinged to the adjusting rod.

[0008] When the hinge center points of the adjusting rod and the connecting rod are located at different positions relative to the central axis of the adjusting wheel, the distance between the hinge center points of the adjusting rod and the connecting rod and the rotation axis of the eccentric wheel is different.

[0009] Secondly, this application provides a fascia gun, comprising:

[0010] A fascia gun housing, wherein the fascia gun housing has an internal receiving cavity;

[0011] The stroke adjustment device described above, at least a portion of the structure of which is located within the receiving cavity.

[0012] This application provides a stroke adjustment device and a fascia gun. The stroke adjustment device includes a motor and a crank-connecting rod mechanism. The crank-connecting rod mechanism includes an eccentric wheel, a connecting rod, and a piston. The output shaft of the motor is connected to the eccentric wheel. One end of the connecting rod is connected to the piston. The crank-connecting rod mechanism also includes an adjusting wheel and an adjusting rod. The adjusting wheel is eccentrically connected to the eccentric wheel, and the adjusting rod is eccentrically connected to the adjusting wheel. The other end of the connecting rod is hinged to the adjusting rod. When the hinge center points of the adjusting rod and the connecting rod are located at different positions relative to the central axis of the adjusting wheel, the distances between the hinge center points of the adjusting rod and the connecting rod and the rotation axis of the eccentric wheel are different. The fascia gun includes a fascia gun housing and the aforementioned stroke adjustment device. The fascia gun housing has a receiving cavity inside, and at least a portion of the structure of the stroke adjustment device is located within the receiving cavity. The stroke adjustment device described in this application can adjust the stroke over a wide range and steplessly in any working state. By adjusting the stroke of the piston during reciprocating motion, the user's needs for different strokes can be met. Furthermore, when the piston is performing reciprocating striking motion, the stroke adjustment device can greatly reduce the loss of the piston's output striking force, improve the working efficiency of the stroke adjustment device, and thus improve the user's sense of use and comfort, providing a better user experience. Moreover, the stroke adjustment device has a simple, stable, and reliable structure, which not only improves the stability and production efficiency of the fascia gun but also reduces the production cost of the fascia gun. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a three-dimensional structural diagram of a fascia gun according to one embodiment of this application.

[0015] Figure 2 for Figure 1 A three-dimensional structural diagram with the second shell removed.

[0016] Figure 3 This is a three-dimensional structural diagram of the second housing in one embodiment of this application.

[0017] Figure 4 This is a three-dimensional structural diagram of the first housing in one embodiment of this application.

[0018] Figure 5This is a three-dimensional structural schematic diagram of the stroke adjustment device in one embodiment of this application.

[0019] Figure 6 for Figure 5 Cross-sectional view at CC.

[0020] Figure 7 This is a schematic diagram showing the initial position of the hinge center point in an embodiment of this application.

[0021] Figure 8 This is a schematic diagram showing the change in the position of the hinge center point in the embodiments of this application.

[0022] Figure 9 This is a schematic diagram of the eccentricity in an embodiment of this application.

[0023] Figure 10 This is a schematic diagram of the pressure angle in an embodiment of this application.

[0024] Figure 11 for Figure 5 A schematic diagram of the 3D structure with some components removed.

[0025] Figure 12 for Figure 11 A 3D explosion diagram.

[0026] Figure 13 for Figure 11 A three-dimensional exploded diagram with some components removed.

[0027] Figure 14 for Figure 2 A schematic diagram of the three-dimensional structure from another direction.

[0028] Figure 15 for Figure 14 A schematic diagram of the 3D structure with some components removed.

[0029] Figure 16 for Figure 1 Cross-sectional view at point AA.

[0030] Figure 17 for Figure 1 Cross-sectional view at BB.

[0031] Figure 18 for Figure 5 A three-dimensional structural diagram with the bushing and the first threaded component removed.

[0032] Figure 19 for Figure 18 A schematic diagram of the 3D structure with some components removed.

[0033] Icon labels:

[0034] Stroke adjustment device-100;

[0035] Motor-1; Output shaft-11; Mounting section-111;

[0036] Crank-connecting rod mechanism-2; Eccentric wheel-21; Input hole-211; Eccentric part-212; Connecting rod-22; Piston-23; Adjusting wheel-24; Adjusting groove-241; Adjusting rod-25; First connecting part-251; Second connecting part-252; Connecting hole-253; Adjusting disc-26; Adjusting hole-261; Stepped component-27;

[0037] Drive mechanism - 3; Knob - 31; Plug-in part - 311; First screw assembly - 32; First threaded part - 321; First thread - 3211; Second threaded part - 322; Second thread - 3221; Plug-in hole - 3222; First protrusion - 3223; Second screw assembly - 33; Third threaded part - 331; Third thread - 3311; Second protrusion - 3312; Screw - 332; First screw section - 3321; Second screw section - 3322;

[0038] Bearing-4; Installation space-5; Fixing component-6; Fixing ring-7; Hole post-71; Rubber ring-72; Bushing-8; Massage head mounting post-9; Rubber ring-12; Buffer rubber sleeve-13; Insert rod-14; Circuit board-15; Fixing cylinder-16;

[0039] Fascia gun-200; Fascia gun housing-10; Receiving cavity-101; First housing-102; Second housing-103; Insertion hole-104; Rubber sleeve-105; Rotating part-106; Rotating slot-107; Limiting part-108; Limiting cavity-109; Massage head-201; Insertion post-202; Insertion post hole-203; Massage head mounting hole-204. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0041] In the description of the embodiments of this application, it should be understood that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. The term "connection" in this application, unless otherwise specified, primarily refers to a physical structural connection; however, if specified, it may also include direct or indirect connections. The terms "first" and "second" in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0042] Please see Figure 1 and Figure 2 , Figure 1 This is a three-dimensional structural diagram of the fascia gun 200 in one embodiment of this application. Figure 2 for Figure 1 A three-dimensional structural diagram with the second housing 103 removed. The fascia gun 200 includes a fascia gun housing 10 and the aforementioned stroke adjustment device 100. The fascia gun housing 10 has a receiving cavity 101 inside, and at least a portion of the structure of the stroke adjustment device 100 is located within the receiving cavity 101.

[0043] Therefore, the stroke adjustment device 100 can adjust the stroke of the fascia gun 200 in a wide range and steplessly in any working state to meet the user's needs for different strokes of the fascia gun 200, thereby improving the user's sense of use and comfort when using the fascia gun 200 and bringing a better user experience.

[0044] Please see Figure 3 and Figure 4 , Figure 3 This is a perspective view of the second housing 103 in one embodiment of this application. Figure 4 This is a perspective view of the first housing 102 in one embodiment of this application. The fascia gun housing 10 includes a first housing 102 and a second housing 103. The first housing 102 is provided with a post 202, and the second housing 103 is provided with a post hole 203, or the second housing 103 is provided with a post 202, and the first housing 102 is provided with a post hole 203. The post 202 is inserted into the post hole 203 to connect the first housing 102 and the second housing 103 to form the fascia gun housing 10.

[0045] Thus, the first housing 102 and the second housing 103 are stably connected to form a complete fascia gun housing 10 and a complete receiving cavity 101, so that the stroke adjustment device 100 is stably installed in the receiving cavity 101, thereby improving the stability and reliability of the stroke adjustment device 100 and even the fascia gun 200 during operation.

[0046] In some embodiments, the first housing 102 is provided with both the insertion hole 203 and the insertion post 202, and the second housing 103 is also provided with both the insertion hole 203 and the insertion post 202. The insertion post 202 of the first housing 102 is inserted into the insertion hole 203 of the second housing 103, and the insertion post 202 of the second housing 103 is inserted into the insertion hole 203 of the first housing 102, so as to connect the first housing 102 and the second housing 103 to form the fascia gun housing 10.

[0047] Please see Figure 5 and Figure 6 , Figure 5 This is a perspective view of the stroke adjustment device 100 in one embodiment of this application. Figure 6 for Figure 5 A cross-sectional view at CC. The stroke adjustment device 100 includes a motor 1 and a crank-connecting rod mechanism 2. The crank-connecting rod mechanism 2 includes an eccentric wheel 21, a connecting rod 22, and a piston 23. The output shaft 11 of the motor 1 is connected to the eccentric wheel 21. One end of the connecting rod 22 is connected to the piston 23. The crank-connecting rod mechanism 2 also includes an adjusting wheel 24 and an adjusting rod 25. The adjusting wheel 24 is eccentrically connected to the eccentric wheel 21, and the adjusting rod 25 is eccentrically connected to the adjusting wheel 24. The other end of the connecting rod 22 is hinged to the adjusting rod 25. When the hinge center points of the adjusting rod 25 and the connecting rod 22 are located at different positions relative to the central axis of the adjusting wheel 24, the distances between the hinge center points of the adjusting rod 25 and the connecting rod 22 and the rotation axis of the eccentric wheel 21 are different.

[0048] Therefore, the stroke adjustment device 100 can adjust the stroke over a wide range and steplessly in any working state. By adjusting the stroke of the piston 23 during reciprocating motion, the user's needs for different strokes can be met. Furthermore, when the piston 23 is performing reciprocating striking motion, the stroke adjustment device 100 can greatly reduce the loss of the output striking force of the piston 23, improve the working efficiency of the stroke adjustment device 100, and thus improve the user's sense of use and comfort, providing a better user experience. Moreover, the stroke adjustment device 100 has a simple, stable, and reliable structure, which not only improves the working stability and production efficiency of the fascia gun 200, but also reduces the production cost of the fascia gun 200.

[0049] The operation of the fascia gun 200 or the stroke adjustment device 100 is considered as the reciprocating motion of the piston 23.

[0050] Please see Figure 7 and Figure 8 , Figure 7 This is a schematic diagram showing the initial position of the hinge center point A in an embodiment of this application. Figure 8 This is a schematic diagram showing the change in position of the hinge center point A in an embodiment of this application. Figure 7 and Figure 8 Point O1 is a point on the central axis of the output shaft 11, and is also considered a point on the rotation axis of the eccentric wheel 21. Point A is the hinge center point of the adjusting rod 25 and the connecting rod 22. Point C is a point on the central axis of the adjusting wheel 24. It can be seen that E1 is the first eccentricity of the eccentric connection between the adjusting wheel 24 and the eccentric wheel 21. E2 is the second eccentricity of the eccentric connection between the hinge center point A of the adjusting rod 25 and the connecting rod 22 and the adjusting wheel 24. E is the distance between the hinge center point A of the adjusting rod 25 and the connecting rod 22 and the rotation axis of the eccentric wheel 21, which is also the total eccentricity.

[0051] Specifically, the rotation axis of the eccentric wheel 21 is also the central axis of the output shaft 11. When the adjusting wheel 24 is eccentrically connected to the eccentric wheel 21 and the adjusting rod 25 is eccentrically connected to the adjusting wheel 24, the distance between the hinge center point A and point O1 on the rotation axis of the eccentric wheel 21 is the eccentricity (i.e., the total eccentricity E). Assuming that the hinge center point A of the adjusting rod 25 and the connecting rod 22 is initially located at... Figure 7 When the adjusting rod 25 moves in a circular motion around the rotation axis of the adjusting wheel 24, the adjusting rod 25 will cause the adjusting wheel 24 to rotate around its central axis. The hinge center point A of the adjusting rod 25 and the connecting rod 22 will change position on the circumference along with the adjusting rod 25. At this time, the hinge center point A of the adjusting rod 25 and the connecting rod 22 is located at... Figure 8 By changing the position of the hinge center point A of the adjusting rod 25 and the connecting rod 22 relative to the central axis of the adjusting wheel 24, the distance between the hinge center point A of the adjusting rod 25 and the connecting rod 22 and point O1 on the rotation axis of the eccentric wheel 21 is changed, that is, the eccentricity E is changed. As a result, the circumference of the circular motion of the hinge center point A of the adjusting rod 25 and the connecting rod 22 around the rotation axis of the eccentric wheel 21 is different depending on the eccentricity E. Thus, the stroke of the reciprocating motion of the piston 23 is adjusted based on the principle of changing the eccentricity.

[0052] Please see Figure 9 , Figure 9 This is a schematic diagram of the eccentricity E in the embodiments of this application. Figure 9Point O1 is a point on the central axis of the output shaft 11, and is also considered a point on the rotation axis of the eccentric wheel 21. Point A is the hinge center of the adjusting rod 25 and the connecting rod 22. Point C is a point on the central axis of the adjusting wheel 24. Connecting them forms a structure as shown in the diagram. Figure 18 From the triangle in the diagram, we can see that E1 is the first eccentricity of the eccentric connection between the adjusting wheel 24 and the eccentric wheel 21, E2 is the second eccentricity of the hinge center point A of the adjusting rod 25 and the connecting rod 22 and the adjusting wheel 24, and E is the distance between the hinge center point A of the adjusting rod 25 and the connecting rod 22 and the rotation axis of the eccentric wheel 21, which is the total eccentricity. Figure 9 Substitute the angle θ, the first eccentricity E1, and the second eccentricity E2 into the eccentricity formula to obtain the total eccentricity E.

[0053] The eccentricity formula is as follows:

[0054] Please see Figure 10 , Figure 10 This is a schematic diagram of the pressure angle α in this embodiment. Point B is the hinge center point of the connecting rod 22 and the piston 23, and point A is the hinge center point of the adjusting rod 25 and the connecting rod 22. Connecting the hinge center point B of the connecting rod 22 and the piston 23 with the hinge center point A of the adjusting rod 25 and the connecting rod 22, point A is perpendicular to the central axis of the piston 23 to form point O2, thus forming a right triangle. The acute angle α closest to the piston 23 is named the pressure angle. When the stroke of the piston 23 during reciprocating motion is not adjusted, the change of the pressure angle α during the reciprocating motion of the piston 23 is consistent with that of a normal fascia gun. Therefore, the output striking force of the piston 23 is almost unaffected, which greatly reduces the loss of the output striking force of the piston 23, and thus improves the working efficiency of the stroke adjustment device 100.

[0055] Furthermore, when the stroke of the piston 23 during reciprocating motion is not adjusted, the adjusting wheel 24 and the eccentric wheel 21 do not move relative to each other, and the two together form the crank component in the crank-connecting rod mechanism 2.

[0056] In some embodiments, the hinge center point of the adjusting rod 25 and the connecting rod 22 does not intersect with the rotation axis of the eccentric wheel 21.

[0057] Therefore, by limiting the position of the adjusting rod 25, the hinge center point does not intersect with the rotation axis of the eccentric wheel 21, and the distance (eccentricity) between the hinge center point and the rotation axis of the eccentric wheel 21 will not be zero. As a result, the stroke adjusting device 100 will not experience a situation where the piston 23 has no stroke, thus ensuring that the stroke adjusting device 100 is always in a normal working state with stroke, and guaranteeing the normal operation of the stroke adjusting device 100 and even the fascia gun 200.

[0058] Please see Figure 11 and Figure 12 , Figure 11 for Figure 5 A 3D structural diagram with some components removed. Figure 12 for Figure 11 A three-dimensional exploded view. In some embodiments, the stroke adjustment device 100 further includes a fixing member 6, the adjusting wheel 24 is provided with an adjusting groove 241, the adjusting rod 25 is installed in the adjusting groove 241, and the fixing member 6 passes through the bottom of the adjusting groove 241 and at least part of the adjusting rod 25, so that the adjusting rod 25 is eccentrically connected to the adjusting wheel 24.

[0059] Thus, by connecting the adjusting wheel 24 and the adjusting rod 25 together through the fixing member 6, the stability of their connection is improved, and the stability and reliability of the stroke adjusting device 100 are further improved.

[0060] In some embodiments, the adjusting rod 25 includes a first connecting portion 251 and a second connecting portion 252. The first connecting portion 251 is eccentrically connected to the adjusting wheel 24, and the second connecting portion 252 is eccentrically connected to the first connecting portion 251. The other end of the connecting rod 22 is hinged to the first connecting portion 251, and the second screw segment 3322 is connected to the second connecting portion 252. The hinge center point of the first connecting portion 251 and the connecting rod 22 does not intersect with the rotation axis of the eccentric wheel 21. The central axis of the second connecting portion 252 coincides with the central axis of the adjusting wheel 24. When the hinge center points of the first connecting portion 251 and the connecting rod 22 are located at different positions relative to the central axis of the adjusting wheel 24, the distance between the hinge point of the adjusting rod 25 and the connecting rod 22 and the rotation axis of the eccentric wheel 21 is different.

[0061] Therefore, the second connecting part 252 rotates under the drive of the screw 332, thereby driving the first connecting part 251 to make a circular motion around the rotation axis of the eccentric wheel 21, which can simplify the structure to a certain extent and improve the stability and reliability of the stroke adjustment device 100.

[0062] In some embodiments, the stroke adjustment device 100 further includes a step member 27, which is disposed on the adjustment wheel 24 in an ascending step shape and is engaged with the first connecting part 251 to prevent it from shaking when the stroke adjustment device 100 is working, thereby improving the stability of the adjustment rod 25 and the connecting rod 22.

[0063] In some embodiments, the crank-connecting rod mechanism 2 further includes an adjusting disk 26, which is fixed to the eccentric wheel 21. The adjusting disk 26 has an adjusting hole 261, and the adjusting wheel 24 is slidably installed in the adjusting hole 261.

[0064] Therefore, the adjusting wheel 24 is installed in the adjusting hole 261 in the adjusting plate 26 and does not contact the surface of the eccentric wheel 21, which can avoid friction between the adjusting wheel 24 and the eccentric wheel 21, so as to minimize the error in stroke adjustment caused by friction, and also improve the service life of the adjusting wheel 24 and the eccentric wheel 21.

[0065] In some embodiments, a bearing 4 is provided between the adjusting hole 261 and the adjusting wheel 24. The bearing 4 prevents the adjusting wheel 24 from affecting the adjusting disk 26 when it rotates. The adjusting disk 26 and the eccentric wheel 21 are connected by the fixing member 6, so that the adjusting disk 26 rotates with the eccentric wheel 21, preventing the adjusting disk 26 from being driven by the adjusting wheel 24 and improving the stability of the stroke adjusting device 100.

[0066] Please see Figure 13 , Figure 13 for Figure 11 An exploded 3D view with some components removed. In some embodiments, the eccentric wheel 21 has an eccentric portion 212, the bearing 4 between the adjusting hole 261 and the adjusting wheel 24 is located on the eccentric portion 212, and the adjusting wheel 24 is located inside the eccentric portion 212, but the bottom of the adjusting wheel 24 does not contact the eccentric portion 212.

[0067] In some embodiments, the eccentric wheel 21 is provided with an input hole 211, which is a non-circular hole, and the output shaft 11 includes a mounting section 111, which is adapted to the shape of the input hole 211 and is accommodated in the input hole 211, so that the output shaft 11 drives the eccentric wheel 21 to rotate.

[0068] Therefore, the shapes of the input hole 211 and the mounting section 111 are compatible and both are non-circular, which allows the output shaft 11 to better drive the eccentric wheel 21 to rotate.

[0069] In some embodiments, the stroke adjustment device 100 includes a circuit board 15 connected to the motor 1 to control the operating state of the motor 1.

[0070] Please see Figure 14 and Figure 15 , Figure 14 for Figure 2 A schematic diagram of the three-dimensional structure from another direction. Figure 15 for Figure 14 A three-dimensional structural diagram with some components removed. In some embodiments, the stroke adjustment device 100 includes a retaining ring 7, which is sleeved on the output shaft 11. The retaining ring 7 has a post 71, and the fascia gun housing 10 has an insertion hole 104. The post 71 is inserted into the insertion hole 104 to fix the motor 1 in the receiving cavity 101.

[0071] Thus, the motor 1 is fixed at a certain position in the receiving cavity 101 through the post 71 and the insertion hole 104, so as to fix the stroke adjustment device 100 in the receiving cavity 101, so that the stroke adjustment device 100 works stably in the receiving cavity 101, thereby improving the stability and reliability of the fascia gun 200 during operation.

[0072] It is understood that the outer edge of the fixing ring 7 does not necessarily have to be annular, as long as the outer edge is provided with the hole post 71, there is no limitation here.

[0073] In some embodiments, the number of the perforated posts 71 is multiple, and they are symmetrically arranged at the outer edge of the fixing ring 7, so as to more stably fix the motor 1 in the receiving cavity 101.

[0074] Please see Figure 16 , Figure 16 for Figure 1 Cross-sectional view at AA. In some embodiments, the fascia gun 200 further includes a rubber sleeve 105, which is disposed around the edge of the insertion hole 104 located within the receiving cavity 101.

[0075] Therefore, when the post 71 is inserted into the insertion hole 104, the rubber sleeve 105 connects the post 71. The rubber sleeve 105 can reduce the noise of the fascia gun 200 during operation and can also provide cushioning and shock absorption.

[0076] In some embodiments, the stroke adjustment device 100 further includes a rubber ring 72, which is sleeved on the post 71. Through the interference fit between the rubber ring 72 and the rubber sleeve 105, the stroke adjustment device 100 is stably installed in the receiving cavity 101. The presence of the rubber ring 72 can better reduce the noise of the fascia gun 200 during operation and can also provide buffering and shock absorption.

[0077] In some embodiments, a groove is provided at the middle position of the rubber ring 72, and the end of the rubber sleeve 105 near the receiving cavity 101 is symmetrically bent inward, so that the groove can be engaged with the bent end of the rubber sleeve 105, and the stroke adjustment device 100 can be stably installed in the receiving cavity 101.

[0078] Please see Figure 17 , Figure 17 for Figure 1 Cross-sectional view at BB. In some embodiments, the fascia gun housing 10 is provided with a limiting part 108, the limiting part 108 forming a limiting cavity 109, and the stroke adjustment device 100 further includes a bushing 8, the bushing 8 being fixed in the limiting cavity 109, and the bushing 8 being slidably connected to the outer wall of the piston 23.

[0079] Therefore, the bushing 8 is fixed in the limiting cavity 109 to limit and fix the piston 23, thereby limiting the direction of reciprocating motion of the piston 23, making the operation of the fascia gun 200 stable and reliable, and also preventing the piston 23 from moving with the adjusting rod 25 when adjusting the stroke.

[0080] In some embodiments, the bushing 8 is provided with ridges parallel to the central axis of the piston 23, and the limiting part 108 is provided with ridges surrounding the piston 23. When the bushing 8 is fixed in the limiting cavity 109, the two types of ridges are in contact with each other, which is used to buffer and dampen shock when the stroke adjustment device 100 is working.

[0081] Please see Figure 18 and Figure 19 , Figure 18 for Figure 5 A three-dimensional structural diagram excluding bushing 8 and the first threaded component 321. Figure 19 for Figure 18 A three-dimensional structural diagram with some components removed. In some embodiments, a bearing 4 is fitted onto the piston 23, and the stroke adjustment device 100 further includes a fixed cylinder 16, which is fitted onto the bearing 4. The fixed cylinder 16 has protrusions at both ends to fix the bushing 8 onto the fixed cylinder 16, thereby realizing a sliding connection between the bushing 8 and the piston 23.

[0082] In some embodiments, the stroke adjustment device 100 further includes a drive mechanism 3 connected to the adjustment rod 25, and the rotational motion of the drive mechanism 3 drives the adjustment rod 25 and the adjustment wheel 24 to rotate relative to the eccentric wheel 21.

[0083] Thus, the driving mechanism 3 drives the adjusting rod 25 and the adjusting wheel 24 to rotate, thereby changing the distance between the hinge center point and the rotation axis of the eccentric wheel 21, and thus achieving the purpose of adjusting the stroke.

[0084] In some embodiments, the fascia gun housing 10 is further provided with a rotating part 106, the rotating part 106 is provided with a rotating slot 107, and at least a portion of the drive mechanism 3 of the stroke adjustment device 100 is located in the rotating slot 107.

[0085] Thus, the rotating part 106 limits and fixes the driving mechanism 3 within the fascia gun housing 10, so that the driving mechanism 3 can stably realize its driving function within the receiving cavity 101, change the distance between the hinge center point and the rotation axis of the eccentric wheel 21, and thereby achieve the purpose of adjusting the stroke.

[0086] In some embodiments, the drive mechanism 3 includes a knob 31, a first screw assembly 32, and a second screw assembly 33. The knob 31 is connected to the first screw assembly 32, the first screw assembly 32 is connected to the second screw assembly 33, and the second screw assembly 33 is connected to the adjusting rod 25. The first screw assembly 32 is used to convert the rotational motion of the knob 31 into a displacement motion that moves along a direction parallel to the rotation axis, and the second screw assembly 33 converts the displacement motion into the rotational motion of the adjusting rod 25 and the adjusting wheel 24.

[0087] Thus, through the cooperation between the knob 31, the first screw assembly 32 and the second screw assembly 33, the adjusting rod 25 and the adjusting wheel 24 are driven to rotate, thereby changing the distance between the hinge center point and the rotation axis of the eccentric wheel 21, and thus achieving the purpose of adjusting the stroke.

[0088] In some embodiments, some of the knobs 31 are engaged in the rotating slot 107, but the knobs 31 are not fixed in the rotating slot 107, but have a certain amount of rotatable space in the rotating slot 107 to support their rotation.

[0089] In some embodiments, the knob 31 is engraved with a stroke value. At the connection between the first housing 102 and the second housing 103, with the position closest to the massage head 201 as a reference position, rotating the knob 31 will result in the piston 23 having the stroke value at the reference position when the stroke value on the knob 31 reaches that position. In some embodiments, the stroke value can be any integer value between 8 and 16.

[0090] In some embodiments, the fascia gun 200 includes a ball bearing that passes through the first housing 102 or the second housing 103 and engages with the edge groove of the knob 31. When the knob 31 is rotated, the presence of the ball bearing allows the user to feel a certain rotational force, and the ball bearing can also limit the knob 31 to prevent the knob 31 from shaking when the fascia gun 200 is working.

[0091] In some embodiments, the first screw assembly 32 includes a first threaded member 321 and a second threaded member 322, and the second screw assembly 33 includes a third threaded member 331 and a screw 332. The inner wall of the first threaded member 321 is provided with a first thread 3211, and the outer wall of the second threaded member 322 is provided with a second thread 3221. The first thread 3211 and the second thread 3221 are mutually adapted and installed. The third threaded member 331 is slidably installed inside the second threaded member 322, and the inner wall of the third threaded member 331 is provided with a third thread 3311. The screw 332 includes a first screw section 3321 and a second screw section 3322. The third thread 3311 and the threads on the first screw section 3321 are mutually adapted and installed. The second screw section 3322 is connected to the adjusting rod 25.

[0092] Thus, the first threaded component 321 and the second threaded component 322 cooperate with each other, so that the second threaded component 322 changes from rotational motion to displacement motion, and the third threaded component 331 moves with the second threaded component 322 to move displacement motion, and causes the screw 332 to rotate, thereby driving the adjusting rod 25 and the adjusting wheel 24 to rotate, so as to change the distance between the hinge center point and the rotation axis of the eccentric wheel 21, thereby achieving the purpose of adjusting the stroke.

[0093] Specifically, a bearing 4 is installed between the inner wall of the second threaded component 322 and the outer wall of the third threaded component 331. The screw 332 is connected to the adjusting rod 25. The first threaded component 321 is fixed, driving the second threaded component 322 to rotate relative to the first threaded component 321. The second threaded component 322 moves in a direction parallel to the rotation axis through the interaction of the first thread 3211 and the second thread 3221, and simultaneously drives the third threaded component 331 to move in a direction parallel to the rotation axis. During the movement, the third threaded component 331 drives the screw 332 to rotate through the interaction of the third thread 3311 and the threads on the first screw segment 3321, causing the adjusting rod 25 and the adjusting wheel 24 to rotate simultaneously.

[0094] In some embodiments, the knob 31 is provided with a plug-in portion 311, and the second threaded member 322 is provided with a plug-in hole 3222. The plug-in portion 311 is inserted into the plug-in hole 3222, and the plug-in portion 311 and the hole wall of the plug-in hole 3222 are slidably connected along the lifting and lowering direction of the displacement movement. The knob 31 drives the second threaded member 322 to rotate through the plug-in portion 311, and through the interaction of the first thread 3211 and the second thread 3221, the second threaded member 322 makes displacement movement along the plug-in portion 311.

[0095] Thus, the knob 31 drives the second threaded component 322 to rotate through the plug part 311, and causes the second threaded component 322 to make displacement movement, thereby driving the adjusting rod 25 and the adjusting wheel 24 to rotate, so as to change the distance between the hinge center point and the rotation axis of the eccentric wheel 21, thereby achieving the purpose of adjusting the stroke.

[0096] In some embodiments, the first screw assembly 32 is used to convert the rotational motion of the knob 31 into a displacement motion, and the second screw assembly 33 converts the displacement motion into the rotational motion of the adjusting rod 25 and the adjusting wheel 24 to satisfy a first formula, which is:

[0097]

[0098] Wherein, a is the rotation angle of the knob 31, b is the rotation angle of the adjusting wheel 24, c is the lead of the first screw segment 3321, and d is the lead of the knob 31.

[0099] Therefore, the relationship between the rotation angle of the knob 31, the rotation angle of the adjusting wheel 24, the lead of the first screw segment 3321 and the lead of the knob 31 can be constructed through the first formula, so as to fully control the rotation angle of the knob 31 and thus adjust the stroke more precisely.

[0100] Wherein, the lead of the first screw segment 3321 is: the displacement of the third threaded component 331 on the axis of the first screw segment 3321 when the first screw segment 3321 rotates, and the lead of the knob 31 is: the displacement of the second threaded component 322 on the axis of the knob 31 when the knob 31 rotates.

[0101] As mentioned above, when the stroke of the piston 23 during reciprocating motion is not adjusted, the third threaded part 331, the screw 332, the adjusting rod 25, the adjusting wheel 24 and the eccentric wheel 21 together form a crank, and together with the connecting rod and the piston, they form a crank-piston mechanism to drive the piston 23 to reciprocate.

[0102] In some embodiments, the stroke adjustment device 100 further includes a bearing 4, the inner wall of the second threaded member 322 is provided with a first protrusion 3223, the outer wall of the third threaded member 331 is provided with a second protrusion 3312, the first protrusion 3223 and the second protrusion 3312 are arranged opposite to each other, and an installation space 5 is formed between the first protrusion 3223 and the second protrusion 3312, and the bearing 4 is installed in the installation space 5 to connect the second threaded member 322 and the third threaded member 331 respectively.

[0103] Thus, the bearing 4 is engaged in the mounting space 5 by the first protrusion 3223 and the second protrusion 3312, so that the rotational movement of the second threaded member 322 does not interfere with the third threaded member 331, so that only the third threaded member 331 makes displacement movement, avoiding errors in the process of adjusting the stroke.

[0104] In some embodiments, the fascia gun 200 further includes a buffer sleeve 13, which is arranged around the outside of the first threaded member 321 and is engaged in the rotating slot 107. This not only fixes the drive mechanism 3 in the receiving cavity 101, but also buffers the vibration of the stroke adjustment device 100 during operation, thereby providing shock absorption.

[0105] As mentioned above, when the adjusting rod 25 and the adjusting wheel 24 rotate simultaneously, one end of the connecting rod 22 rotates with the adjusting rod 25. However, since the piston 23 and the connecting rod 22 are hinged together by the bearing 4 and the fixing member 6, the connecting rod 22 will not drive the piston 23 to move when it moves. It will only drive the piston 23 to move when the fascia gun 200 is working.

[0106] The aforementioned strokes refer to the distance between the farthest and closest ends that the piston 23 can move relative to the limiting part 108 when the piston 23 is reciprocating.

[0107] In some embodiments, the adjusting rod 25 is provided with a connecting hole 253, and the second screw segment 3322 is inserted into the connecting hole 253 to connect the adjusting rod 25. The connecting hole 253 is a non-circular hole, and the shape of the second screw segment 3322 is adapted to the connecting hole 253 for a more stable connection and to drive the adjusting rod 25 to rotate.

[0108] In some embodiments, the stroke adjustment device 100 further includes a plug rod 14 that passes through the screw 332 and is inserted into the adjustment rod 25, thereby making the connection between the screw 332 and the adjustment rod 25 more stable.

[0109] In some embodiments, the central axis of the screw 332 and the central axis of the second connecting portion 252 are aligned.

[0110] Therefore, by limiting the connection between the screw 332 and the second connecting part 252, the screw 332 can more easily drive the second connecting part 252 to rotate, thereby improving the stability and reliability of the stroke adjustment device 100.

[0111] In some embodiments, the second threaded member 322 and the third threaded member 331 are also connected by the fixing member 6, so that the second threaded member 322 drives the third threaded member 331 to perform lifting and lowering movements.

[0112] In some embodiments, the fascia gun 200 further includes a massage head 201, which has a massage head mounting hole 204. The stroke adjustment device 100 further includes a massage head mounting post 9, one end of which is inserted into the piston 23, and the other end of which is inserted into the massage head mounting hole 204, so that the stroke adjustment device 100 is connected to the massage head 201.

[0113] Thus, the massage head 201 is fixed to the stroke adjustment device 100 via the massage head mounting post 9, so that the stroke of the piston 23 driving the massage head 201 to reciprocate can be adjusted by the stroke adjustment device 100, which can meet the user's needs for different strokes, improve the user's feel and comfort when using the fascia gun 200, and bring the user a better user experience.

[0114] In some embodiments, the fascia gun 200 further includes an adhesive ring 12, which is sleeved on the massage head mounting post 9. When one end of the massage head mounting post 9 is inserted into the piston 23, the adhesive ring 12 contacts the piston 23 and limits and fixes one end of the massage head mounting post 9 within the piston 23.

[0115] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A stroke adjustment device, characterized in that, include: Electric motor; A crank-connecting rod mechanism, comprising an eccentric wheel, a connecting rod, and a piston, wherein the output shaft of the motor is connected to the eccentric wheel, and one end of the connecting rod is connected to the piston; The crank-connecting rod mechanism further includes an adjusting wheel and an adjusting rod. The adjusting wheel is eccentrically connected to the eccentric wheel, the adjusting rod is eccentrically connected to the adjusting wheel, and the other end of the connecting rod is hinged to the adjusting rod. When the hinge center points of the adjusting rod and the connecting rod are located at different positions relative to the central axis of the adjusting wheel, the distance between the hinge center points of the adjusting rod and the connecting rod and the rotation axis of the eccentric wheel is different.

2. The stroke adjustment device according to claim 1, characterized in that, The hinge center point of the adjusting rod and the connecting rod does not intersect with the rotation axis of the eccentric wheel.

3. The stroke adjustment device according to claim 1, characterized in that, The stroke adjustment device further includes a drive mechanism connected to the adjustment rod. The rotational motion of the drive mechanism drives the adjustment rod and the adjustment wheel to rotate relative to the eccentric wheel.

4. The stroke adjustment device according to claim 3, characterized in that, The drive mechanism includes a knob, a first screw assembly, and a second screw assembly. The knob is connected to the first screw assembly, the first screw assembly is connected to the second screw assembly, and the second screw assembly is connected to the adjusting rod. The first screw assembly is used to convert the rotational motion of the knob into a displacement motion that moves in a direction parallel to the rotation axis, and the second screw assembly converts the displacement motion into the rotational motion of the adjusting rod and the adjusting wheel.

5. The stroke adjustment device according to claim 4, characterized in that, The first screw assembly includes a first threaded component and a second threaded component. The second screw assembly includes a third threaded component and a screw. The inner wall of the first threaded component is provided with a first thread, and the outer wall of the second threaded component is provided with a second thread. The first thread and the second thread are mutually adapted and installed. The third threaded component is slidably installed inside the second threaded component. The inner wall of the third threaded component is provided with a third thread. The screw includes a first screw section and a second screw section. The third thread and the thread on the first screw section are mutually adapted and installed. The second screw section is connected to the adjusting rod.

6. The stroke adjustment device according to claim 5, characterized in that, The knob is provided with a plug-in part, and the second threaded component is provided with a plug-in hole. The plug-in part is inserted into the plug-in hole, and the plug-in part and the hole wall of the plug-in hole are slidably connected along the lifting and lowering direction of the displacement movement. The knob drives the second threaded component to rotate through the plug-in part, and through the interaction between the first thread and the second thread, the second threaded component makes displacement movement along the plug-in part.

7. The stroke adjustment device according to claim 5, characterized in that, The first screw assembly converts the rotational motion of the knob into displacement motion, and the second screw assembly converts the displacement motion into rotational motion of the adjusting rod and the adjusting wheel, satisfying a first formula, which is: Where a is the rotation angle of the knob, b is the rotation angle of the adjusting wheel, c is the lead of the first screw segment, and d is the lead of the knob.

8. The stroke adjustment device according to claim 5, characterized in that, The stroke adjustment device further includes a bearing. The inner wall of the second threaded component has a first protrusion, and the outer wall of the third threaded component has a second protrusion. The first protrusion and the second protrusion are arranged opposite to each other, and an installation space is formed between the first protrusion and the second protrusion. The bearing is installed in the installation space to connect the second threaded component and the third threaded component respectively.

9. The stroke adjustment device according to claim 5, characterized in that, The adjusting rod includes a first connecting part and a second connecting part. The first connecting part is eccentrically connected to the adjusting wheel, and the second connecting part is eccentrically connected to the first connecting part. The other end of the connecting rod is hinged to the first connecting part, and the second screw segment is connected to the second connecting part. The hinge center point of the first connecting part and the connecting rod does not intersect with the rotation axis of the eccentric wheel. The central axis of the second connecting part coincides with the central axis of the adjusting wheel. When the hinge center points of the first connecting part and the connecting rod are located at different positions relative to the central axis of the adjusting wheel, the distance between the hinge point of the adjusting rod and the connecting rod and the rotation axis of the eccentric wheel is different.

10. The stroke adjusting device according to claim 9, characterized in that, The central axis of the screw and the central axis of the second connecting part are aligned.

11. The stroke adjustment device according to claim 1, characterized in that, The stroke adjustment device further includes a fixing member, the adjusting wheel is provided with an adjusting groove, the adjusting rod is installed in the adjusting groove, and the fixing member passes through the bottom of the adjusting groove and at least part of the adjusting rod so that the adjusting rod is eccentrically connected to the adjusting wheel.

12. The stroke adjustment device according to claim 1, characterized in that, The crank-connecting rod mechanism also includes an adjustment disc, which is fixed to the eccentric wheel. The adjustment disc has an adjustment hole, and the adjustment wheel is slidably installed in the adjustment hole.

13. The stroke adjustment device according to claim 1, characterized in that, The eccentric wheel is provided with an input hole, which is a non-circular hole. The output shaft includes a mounting section, which is adapted to the shape of the input hole and is accommodated in the input hole, so that the output shaft drives the eccentric wheel to rotate.

14. A fascia gun, characterized in that, include: A fascia gun housing, wherein the fascia gun housing has an internal receiving cavity; The stroke adjustment device according to any one of claims 1-13, wherein at least a portion of the structure of the stroke adjustment device is located within the receiving cavity.

15. The fascia gun according to claim 14, characterized in that, The stroke adjustment device includes a fixing ring, which is sleeved on the output shaft. The fixing ring has a post, and the fascia gun housing has an insertion hole. The post is inserted into the insertion hole to fix the motor in the receiving cavity.

16. The fascia gun according to claim 15, characterized in that, The fascia gun also includes a rubber sleeve, which is disposed around the edge of the insertion hole located within the receiving cavity.

17. The fascia gun according to claim 14, characterized in that, The fascia gun housing is also provided with a rotating part, the rotating part is provided with a rotating slot, and at least a part of the drive mechanism of the stroke adjustment device is located in the rotating slot.

18. The fascia gun according to claim 14, characterized in that, The fascia gun housing is provided with a limiting part, which forms a limiting cavity. The stroke adjustment device also includes a bushing, which is fixed in the limiting cavity and is slidably connected to the outer wall of the piston.

19. The fascia gun according to claim 14, characterized in that, The fascia gun also includes a massage head with a massage head mounting hole. The stroke adjustment device also includes a massage head mounting post, one end of which is inserted into the piston and the other end of which is inserted into the massage head mounting hole, so that the stroke adjustment device is connected to the massage head.

20. The fascia gun according to claim 14, characterized in that, The fascia gun housing includes a first housing and a second housing. The first housing is provided with a post, and the second housing is provided with a post hole, or the second housing is provided with a post, and the first housing is provided with a post hole. The post is inserted into the post hole to connect the first housing and the second housing to form the fascia gun housing.

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