A trapezius massager

Abstract

The utility model provides a trapezius massager, including main part assembly, the main part assembly includes lower shell, motor installation bin, bidirectional drive motor, threaded shaft, helical gear, drive gear and rear limit slot. The utility model discloses through bidirectional drive motor drive threaded shaft rotation, make massage top rod can do reciprocating motion under the restriction of front and rear limit slot to realize the massage function to trapezius, can carry out kneading action under the drive of top rod axle, further enriched massage mode, improved massage effect, through the adoption single -layer shell structure, compared with traditional double -deck shell structure, reduced material cost and production process complexity, reduced product overall volume and weight, convenient for user to carry and use, strengthen the stability of internal structure simultaneously, avoid the problem of affecting service life because of the loosening or damage of connecting piece, through install battery and mainboard in the mainboard cover inside, it is convenient to maintain and maintain trapezius massager.

Description

Technical Field

[0001] This utility model relates to the field of massage equipment technology, and in particular to a trapezius muscle massager. Background Technology

[0002] The trapezius muscle is an important muscle in the back and neck, connecting the head, neck, shoulders, and back, and playing a crucial role in posture and movement. Due to modern lifestyles such as prolonged desk work and excessive use of electronic devices, the trapezius muscle is often in a state of tension, easily leading to muscle fatigue, soreness, and even cervical spondylosis.

[0003] Existing trapezius muscle massagers typically include components such as a shell, massage head, motor, gear assembly, battery, and mainboard. The shell is generally divided into an inner shell and an outer shell; the inner shell secures and protects the internal components, while the outer shell serves a decorative and protective function. While this double-shell structure provides good protection, it also presents several problems. For example, the double shell increases material costs and manufacturing complexity, while also increasing the overall size and weight of the massager, making it inconvenient for users to carry and use. Furthermore, because the battery and mainboard are housed within the double shell, repairs are difficult, and the double-shell structure can affect the stability of the internal structure to some extent. Since the inner and outer shells are secured by various connectors, these connectors may loosen or damage over time, affecting the massager's lifespan. Therefore, this paper proposes a new trapezius muscle massager. Utility Model Content

[0004] In view of this, the present invention aims to provide a trapezius muscle massager to solve or alleviate the technical problems existing in the prior art, or at least provide a beneficial alternative.

[0005] The technical solution of this utility model embodiment is implemented as follows: A trapezius muscle massager includes a main body assembly, which includes a lower shell, a motor mounting chamber, a bidirectional drive motor, a threaded shaft, a helical gear, a drive gear, a push rod gear, a push rod shaft, an eccentric disc, a push rod fixing component, a connecting hole, a rotating shaft, a connecting fork component, a pin shaft, a massage push rod, a limiting shaft, a front limiting groove, a bottom cover, and a rear limiting groove;

[0006] A motor mounting compartment is located in the middle of the inner rear wall of the lower shell. A bidirectional drive motor is fixedly connected to the inner side wall of the motor mounting compartment. Both output ends of the bidirectional drive motor are fixedly connected to threaded shafts. Helical gears are meshed on the outer sides of the outer sides of the two threaded shafts. A drive gear is located on the outer side of the center of the upper surface of each helical gear. A push rod gear is meshed on the outer side wall of the drive gear. A push rod shaft is fixedly connected to the inner side wall of the push rod gear. An eccentric disk is fixedly connected to the outer side wall of the push rod shaft near the front of the push rod gear. A push rod fixing member is rotatably connected to the outer side wall of the eccentric disk. A connecting hole is provided on the upper front surface of the push rod fixing member. A connecting fork is rotatably connected to the inner side wall of the connecting hole via a rotating shaft. The inner sidewall of the lower shell is slidably connected to a massage rod via a pin. The rear surfaces of the two massage rods penetrate the upper parts of the inner rear wall of the lower shell on both sides. A limiting shaft penetrates the rear part of one side of each massage rod. Front limiting grooves are provided on the upper parts of the rear surfaces of the lower shell near the massage rods. The outer sides of the limiting shaft are rotatably connected to the inner sidewalls of the front limiting grooves. A bottom cover is fixedly connected to the outer sides of the rear surfaces of the lower shell near the front limiting grooves. Rear limiting grooves are provided on both sides of the middle of the front surface of the bottom cover. The outer sides of the limiting shaft are rotatably connected to the inner sidewalls of the rear limiting grooves. An upper shell is fixedly connected to the front surface of the lower shell. A main control board is installed in the middle of the front surface of the upper shell. A Zyer sensor is provided on one side of the main control board.

[0007] More preferably, the front surface of the lower shell is fixedly connected to the upper shell, the front surfaces of the two push rod shafts respectively penetrate through both sides of the inner front wall of the upper shell, the front part of the outer side wall of each of the two push rod shafts is fixedly connected to a connecting plate, the front surface of each of the two connecting plates is fitted with a kneading fixing member through a kneading eccentric cover, the front surfaces of the two kneading fixing members are fixedly connected to a kneading member on the side away from each other, the front part of the upper and lower surfaces of the kneading member is rotatably connected to a massage head through a connecting shaft, and a sensing magnet is provided on the rear surface of the connecting plate near the Zyer sensor.

[0008] More preferably, the upper part of both sides of the inner rear wall of the lower shell is provided with a rear limiting hole, the inner sidewall of the helical gear and the drive gear is rotatably connected to a mounting shaft, the rear part of the outer sidewall of the mounting shaft is fitted to the inner sidewall of the rear limiting hole, the upper part of both sides of the inner rear wall of the lower shell is fixedly connected to a limiting frame near the outer side of the rear limiting hole, the lower center of the rear surface of the limiting frame is provided with a front limiting hole, and the front part of the outer sidewall of the mounting shaft is fitted to the inner sidewall of the front limiting hole.

[0009] More preferably, the lower part of both sides of the inner rear wall of the lower shell is provided with a rear limiting groove, and the rear part of the outer side wall of the top rod shaft is rotatably connected to a rear limiting cover, and the outer side wall of the rear limiting cover is fitted to the inner side wall of the rear limiting groove.

[0010] More preferably, a front limiting cover is rotatably connected to the outer side wall of the push rod shaft near the front part of the eccentric disk, and front limiting grooves are provided on both sides of the inner rear wall of the upper shell near the outer side of the push rod shaft, and the outer side wall of the front limiting cover is fitted to the inner side wall of the front limiting groove.

[0011] More preferably, a battery compartment is provided on the upper part of the inner rear wall of the lower shell, and a rechargeable battery is installed inside the battery compartment.

[0012] More preferably, a motherboard cover is fixedly connected to the outer side of the front surface of the upper shell near the main control board.

[0013] More preferably, the upper part of the rear surface of the motherboard cover is attached to the upper part of the front surface of the lower shell near the battery compartment.

[0014] The present invention has the following advantages due to the adoption of the above technical solution:

[0015] 1. This utility model uses a bidirectional drive motor to rotate the threaded shaft, enabling the massage rod to reciprocate under the restriction of the front and rear limit grooves, thereby realizing the massage function of the trapezius muscle. At the same time, driven by the rod shaft, the massage head can perform kneading action, further enriching the massage mode and improving the massage effect. In addition, the cooperation between the Zyer sensor on the main control board and the induction magnet on the connecting plate ensures the stability and accuracy of each component during the movement, preventing the trapezius muscle massager from clamping the neck after the massage.

[0016] 2. By adopting a single-layer shell structure, this utility model reduces material costs and manufacturing process complexity compared to the traditional double-layer shell structure, reduces the overall size and weight of the product, making it easier for users to carry and use. At the same time, it enhances the stability of the internal structure and avoids the problem of service life being affected by loose or damaged connectors.

[0017] 3. This utility model installs the battery and motherboard inside the motherboard cover, eliminating the need to disassemble the upper and lower shells. Only the motherboard cover needs to be removed to repair the battery and motherboard, thus facilitating the maintenance of the trapezius muscle massager.

[0018] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a structural view of the present invention.

[0021] Figure 2 This is another structural view of the present invention;

[0022] Figure 3 This is a structural diagram of the lower shell and upper shell of this utility model;

[0023] Figure 4 For the present utility model Figure 3 Another perspective on the structure diagram;

[0024] Figure 5 This is a structural diagram of the bidirectional drive motor and push rod gear of this utility model;

[0025] Figure 6 This is a structural diagram of the connecting disc and massage head of this utility model;

[0026] Figure 7 This is a structural diagram of the Zyer sensor and induction magnet of this utility model.

[0027] Reference numerals: 1. Main body assembly; 11. Lower shell; 12. Motor mounting compartment; 13. Bidirectional drive motor; 14. Threaded shaft; 15. Helical gear; 16. Drive gear; 17. Push rod gear; 18. Push rod shaft; 19. Eccentric disc; 20. Push rod fixing piece; 21. Connecting hole; 22. Rotating shaft; 23. Connecting fork; 24. Pin; 25. Massage push rod; 26. Limiting shaft; 27. Front limiting groove; 28. Bottom cover; 29. ​​Rear limiting groove; 30. Upper... 31. Shell; 32. Connecting plate; 33. Kneading eccentric cover; 34. Kneading fixing component; 35. Kneading component; 36. Connecting shaft; 37. Massage head; 38. Rear limiting hole; 39. Mounting shaft; 40. Limiting frame; 41. Front limiting hole; 42. Rear limiting groove; 43. Rear limiting cover; 44. Front limiting cover; 45. Front limiting groove; 46. Battery compartment; 47. Rechargeable battery; 48. Main control board; 49. Main board cover; 50. Zyer sensor; 51. Induction magnet. Detailed Implementation

[0028] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0029] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0030] like Figures 1-7 As shown, this utility model embodiment provides a trapezius muscle massager, including a main body component 1. The main body component 1 includes a lower shell 11, a motor mounting chamber 12, a bidirectional drive motor 13, a threaded shaft 14, a helical gear 15, a drive gear 16, a push rod gear 17, a push rod shaft 18, an eccentric disc 19, a push rod fixing component 20, a connecting hole 21, a rotating shaft 22, a connecting fork component 23, a pin shaft 24, a massage push rod 25, a limiting shaft 26, a front limiting groove 27, a bottom cover 28, and a rear limiting groove 29.

[0031] A motor mounting compartment 12 is provided in the middle of the inner rear wall of the lower shell 11. A bidirectional drive motor 13 is fixedly connected to the inner side wall of the motor mounting compartment 12. Both output ends of the bidirectional drive motor 13 are fixedly connected to threaded shafts 14. Helical gears 15 are meshed on the outer side walls of the two threaded shafts 14. A drive gear 16 is provided on the outer side of the center of the upper surface of the helical gear 15. A push rod gear 17 is meshed on the outer side wall of the drive gear 16. A push rod shaft 18 is fixedly connected to the inner side wall of the push rod gear 17. The outer side wall of the push rod shaft 18 is fixedly connected to the front part of the push rod gear 17. An eccentric disc 19 is provided, and a push rod fixing member 20 is rotatably connected to the outer wall of the eccentric disc 19. A connecting hole 21 is provided on the upper part of the front surface of the push rod fixing member 20. A connecting fork 23 is rotatably connected to the inner side wall of the connecting hole 21 through a rotating shaft 22. A massage push rod 25 is slidably connected to the top of the inner side wall of the connecting fork 23 through a pin 24. The rear surfaces of the two massage push rods 25 respectively penetrate the upper parts of the inner rear wall of the lower shell 11. A limit shaft 26 penetrates the rear part of one side of the massage push rod 25. A front limit is provided on both sides of the upper part of the rear surface of the lower shell 11 near the massage push rod 25. The outer sides of the limiting shaft 26 are rotatably connected to the inner sidewall of the front limiting groove 27. A bottom cover 28 is fixedly connected to the rear surface of the lower shell 11 near the outer side of the front limiting groove 27. Rear limiting grooves 29 are formed on both sides of the center of the front surface of the bottom cover 28. The outer sides of the limiting shaft 26 are rotatably connected to the inner sidewall of the rear limiting groove 29. An upper shell 30 is fixedly connected to the front surface of the lower shell 11. A main control board 47 is installed in the center of the front surface of the upper shell 30. A Zyer sensor 49 is provided on one side of the main control board 47. The Zyer sensor 49 on the main control board 47... It is used to detect relevant parameters such as the distance or pressure change between the massager and the neck, so as to prevent the trapezius muscle massager from clamping the neck after the massage. The movement of the eccentric plate 19 drives the top rod fixing part 20 to make a corresponding swinging motion. The connecting hole 21 on the upper part of the front surface of the top rod fixing part 20 is rotatably connected to the connecting fork part 23 through the rotating shaft 22. The top of the inner side wall of the connecting fork part 23 is slidably connected to the massage top rod 25 through the pin 24. When the top rod fixing part 20 swings, the linkage between the connecting fork part 23 and the pin 24 pushes the massage top rod 25 to make reciprocating motion.

[0032] In one embodiment, specifically: the front surfaces of the two push rod shafts 18 respectively penetrate the inner front wall of the upper shell 30 on both sides; a connecting plate 31 is fixedly connected to the front part of the outer side wall of each of the two push rod shafts 18; a kneading fixing member 33 is installed on the front surface of each of the two connecting plates 31 through a kneading eccentric cover 32; a kneading member 34 is fixedly connected to the side of the front surface of each of the two kneading fixing members 33 that is far apart; a massage head 36 is rotatably connected to the front part of the upper and lower surfaces of the kneading member 34 through a connecting shaft 35; and the rear surface of the connecting plate 31 is close to the side of the Zyer sensor 49. Equipped with an induction magnet 50, the kneading eccentric cover 32 is rotated via the top rod shaft 18, which in turn causes the kneading fixing member 33 to swing, thereby causing the kneading member 34 to move together with the kneading fixing member 33. The massage head 36, which is rotatably connected to the upper and lower front surfaces of the kneading member 34 via the connecting shaft 35, performs a kneading-like motion under the action of the kneading member 34. Through the cooperation of the Zyer sensor 49 and the induction magnet 50 on the connecting plate 31, the massage head 36 is reset after the massage ends, thereby preventing the trapezius muscle massager from clamping the neck after the massage ends.

[0033] In one embodiment, specifically: rear limiting holes 37 are provided on the upper part of both sides of the inner rear wall of the lower shell 11; the inner sidewalls of the helical gear 15 and the drive gear 16 are rotatably connected to the mounting shaft 38; the rear part of the outer sidewall of the mounting shaft 38 is fitted to the inner sidewall of the rear limiting hole 37; the upper part of both sides of the inner rear wall of the lower shell 11 near the outer side of the rear limiting hole 37 are fixedly connected to the limiting frame 39; a front limiting hole 40 is provided at the center of the lower part of the rear surface of the limiting frame 39; the front part of the outer sidewall of the mounting shaft 38 is fitted to the inner sidewall of the front limiting hole 40; the mounting shaft 38 is limited by the rear limiting hole 37 and the front limiting hole 40, thereby increasing the stability of the rotation of the helical gear 15 and the drive gear 16.

[0034] In one embodiment, specifically: a rear limiting groove 41 is provided on both lower sides of the inner rear wall of the lower shell 11, and a rear limiting cover 42 is rotatably connected to the rear side of the outer side wall of the push rod shaft 18. The outer side wall of the rear limiting cover 42 is fitted to the inner side wall of the rear limiting groove 41. The rear limiting groove 41 limits the rear limiting cover 42 on the push rod shaft 18, thereby increasing the stability of the rotation of the push rod shaft 18.

[0035] In one embodiment, specifically: a front limiting cover 43 is rotatably connected to the outer side wall of the push rod shaft 18 near the front of the eccentric disk 19; front limiting grooves 44 are provided on both sides of the inner rear wall of the upper shell 30 near the outer side of the push rod shaft 18; the outer side wall of the front limiting cover 43 is fitted to the inner side wall of the front limiting groove 44; the front limiting groove 44 limits the front limiting cover 43 on the push rod shaft 18, thereby further increasing the stability of the rotation of the push rod shaft 18.

[0036] In one embodiment, specifically: a battery compartment 45 is provided on the upper part of the inner rear wall of the lower shell 11, and a rechargeable battery 46 is installed inside the battery compartment 45. The rechargeable battery 46 provides power storage for the entire massager within the battery compartment 45.

[0037] In one embodiment, specifically: a mainboard cover 48 is fixedly connected to the front surface of the upper shell 30 near the outer side of the main control board 47. During the operation of the massager, the main control board 47 continuously monitors and controls the operating status of the bidirectional drive motor 13. According to different massage modes and intensities selected by the user, it adjusts parameters such as the motor speed, direction, and running time. For example, in the gentle massage mode, the main control board 47 controls the bidirectional drive motor 13 to run at a lower speed, and the movement frequency of the massage rod 25 and the kneading force of the massage head 36 are relatively small. In the strong massage mode, the speed of the bidirectional drive motor 13 increases, and the intensity of the massage action also increases accordingly. At the same time, the main control board 47 can also monitor the power status of the rechargeable battery 46. When the power is low, it prompts the user to charge it in time to ensure the normal use of the massager. By installing the main control board 47 on the front surface of the upper shell 30, when repairing the main board, only the mainboard cover 48 needs to be removed, without removing the upper shell 30, thus facilitating the disassembly and repair of the main control board 47.

[0038] In one embodiment, specifically: the upper part of the rear surface of the motherboard cover 48 is attached to the upper part of the front surface of the lower shell 11 near the battery compartment 45. The motherboard cover 48 facilitates the sealing of the battery compartment 45, thereby protecting the internal rechargeable battery 46. When replacing the rechargeable battery 46, the motherboard cover 48 can be removed to take the rechargeable battery 46 out of the battery compartment 45, thereby facilitating the replacement and maintenance of the rechargeable battery 46.

[0039] When this utility model is in operation: The bidirectional drive motor 13 is started, and its two output ends simultaneously output power, driving the fixedly connected threaded shaft 14 to rotate. The rotation of the threaded shaft 14 drives the helical gear 15 meshing with it to rotate. The drive gear 16 on the helical gear 15 rotates synchronously with the helical gear 15. The drive gear 16 meshes with the push rod gear 17, causing the push rod gear 17 to start rotating. When the push rod gear 17 rotates, it drives the fixedly connected push rod shaft 18 to rotate together. The eccentric disk 19 on the push rod shaft 18 performs eccentric motion. Because the eccentric disk 19 and the push rod fixing part 20 rotate... The eccentric disc 19 moves, causing the push rod fixing part 20 to swing accordingly. The connecting hole 21 on the upper part of the front surface of the push rod fixing part 20 is rotatably connected to the connecting fork part 23 through the rotating shaft 22. The top of the inner side wall of the connecting fork part 23 is slidably connected to the massage push rod 25 through the pin 24. When the push rod fixing part 20 swings, the linkage between the connecting fork part 23 and the pin 24 pushes the massage push rod 25 to reciprocate. During the movement of the massage push rod 25, the limiting shaft 26 that passes through its rear is located on both sides of the upper part of the rear surface of the lower shell 11 near the massage push rod 25. The front limiting grooves 27 on both sides rotate, while the limiting shaft 26 also rotates in the rear limiting grooves 29 on both sides of the middle of the front surface of the bottom cover 28. The front limiting grooves 27 and the rear limiting grooves 29 together limit and guide the limiting shaft 26, ensuring that the massage rod 25 reciprocates stably in the set direction, thereby performing effective massage actions on the trapezius muscle, such as pounding and pushing. During the rotation of the rod shaft 18, the connecting plate 31 fixedly connected to its front also rotates. The connecting plate 31 drives the kneading fixing part 33 to move through the kneading eccentric cover 32. The kneading fixing members 33 are located on both sides of the front surface of the connecting plate 31 and are far apart. When the connecting plate 31 rotates, the two kneading fixing members 33 swing relative to each other. The kneading member 34, which is fixedly connected to the side of the front surface of the kneading fixing member 33 that is far apart, moves together with the kneading fixing member 33. The massage head 36, which is rotatably connected to the front part of the upper and lower surfaces of the kneading member 34 through the connecting shaft 35, performs a kneading-like action under the action of the kneading member 34. This action, combined with the massage action of the massage top rod 25, further enriches the massage effect and brings users a more comfortable and comprehensive massage experience.

[0040] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A trapezius muscle massager, characterized in that: The main body assembly (1) includes a lower shell (11), a motor mounting compartment (12), a bidirectional drive motor (13), a threaded shaft (14), a helical gear (15), a drive gear (16), a push rod gear (17), a push rod shaft (18), an eccentric disc (19), a push rod fixing piece (20), a connecting hole (21), a rotating shaft (22), a connecting fork piece (23), a pin shaft (24), a massage push rod (25), a limiting shaft (26), a front limiting groove (27), a bottom cover (28), and a rear limiting groove (29). A motor mounting compartment (12) is provided in the middle of the inner rear wall of the lower shell (11). A bidirectional drive motor (13) is fixedly connected to the inner side wall of the motor mounting compartment (12). Both output ends of the bidirectional drive motor (13) are fixedly connected to threaded shafts (14). Helical gears (15) are meshed on the outer side walls of the two threaded shafts (14). A drive gear (16) is provided on the outer side of the center of the upper surface of the helical gear (15). A push rod tooth is meshed on the outer side wall of the drive gear (16). The inner wall of the push rod gear (17) is fixedly connected to the push rod shaft (18), and the outer wall of the push rod shaft (18) is fixedly connected to the front part of the push rod gear (17) with an eccentric disk (19). The outer wall of the eccentric disk (19) is rotatably connected to the push rod fixing member (20). The upper part of the front surface of the push rod fixing member (20) is provided with a connecting hole (21). The inner wall of the connecting hole (21) is rotatably connected to the connecting fork (23) through the rotating shaft (22). 3) The top of the inner sidewall is slidably connected to a massage rod (25) by a pin (24). The rear surfaces of the two massage rods (25) respectively penetrate the upper part of the inner rear wall of the lower shell (11). The rear part of one side of the massage rod (25) penetrates a limiting shaft (26). The upper part of the rear surface of the lower shell (11) is provided with front limiting grooves (27) on both sides near the massage rods (25). The outer sidewalls of the limiting shaft (26) are rotatably connected to the inner sidewalls of the front limiting grooves (27). (11) has a bottom cover (28) fixedly connected to the outer side of the front limiting groove (27) on both sides of the rear surface. The bottom cover (28) has a rear limiting groove (29) on both sides of the middle of the front surface. The outer side wall of the limiting shaft (26) is rotatably connected to the inner side wall of the rear limiting groove (29). The front surface of the lower shell (11) is fixedly connected to the upper shell (30). The middle of the front surface of the upper shell (30) is equipped with a main control board (47). A Zyer sensor (49) is provided on one side of the main control board (47).

2. The trapezius muscle massager according to claim 1, characterized in that: The front surfaces of the two push rod shafts (18) respectively penetrate the inner front wall of the upper shell (30). The front of the outer side wall of the two push rod shafts (18) is fixedly connected to the connecting plate (31). The front surfaces of the two connecting plates (31) are equipped with kneading fixing parts (33) through kneading eccentric covers (32). The sides of the front surfaces of the two kneading fixing parts (33) that are far apart are fixedly connected to kneading parts (34). The front of the upper and lower surfaces of the kneading parts (34) are rotatably connected to massage heads (36) through connecting shafts (35). The rear surface of the connecting plate (31) is provided with a sensing magnet (50) on the side near the Zyer sensor (49).

3. The trapezius muscle massager according to claim 1, characterized in that: The upper part of both sides of the inner rear wall of the lower shell (11) is provided with a rear limiting hole (37). The inner side wall of the helical gear (15) and the drive gear (16) is rotatably connected to the mounting shaft (38). The rear part of the outer side wall of the mounting shaft (38) is attached to the inner side wall of the rear limiting hole (37). The upper part of both sides of the inner rear wall of the lower shell (11) near the outer side of the rear limiting hole (37) is fixedly connected to a limiting bracket (39). The lower center of the rear surface of the limiting bracket (39) is provided with a front limiting hole (40). The front part of the outer side wall of the mounting shaft (38) is attached to the inner side wall of the front limiting hole (40).

4. The trapezius muscle massager according to claim 1, characterized in that: The lower shell (11) has rear limiting grooves (41) on both sides of the lower inner rear wall. The rear outer side wall of the top rod shaft (18) is rotatably connected to a rear limiting cover (42). The outer side wall of the rear limiting cover (42) is attached to the inner side wall of the rear limiting groove (41).

5. A trapezius muscle massager according to claim 2, characterized in that: The outer side wall of the top rod shaft (18) is rotatably connected to the front part of the eccentric disk (19) and the inner rear wall of the upper shell (30) is provided with a front limiting groove (44) on both sides near the outer side of the top rod shaft (18). The outer side wall of the front limiting cover (43) is fitted to the inner side wall of the front limiting groove (44).

6. The trapezius muscle massager according to claim 1, characterized in that: A battery compartment (45) is provided on the upper part of the inner rear wall of the lower shell (11), and a rechargeable battery (46) is installed inside the battery compartment (45).

7. A trapezius muscle massager according to claim 6, characterized in that: The front surface of the upper shell (30) is fixedly connected to the outer side of the main control board (47) with a motherboard cover (48).

8. A trapezius muscle massager according to claim 7, characterized in that: The upper part of the rear surface of the motherboard cover (48) is attached to the upper part of the front surface of the lower shell (11) near the battery compartment (45).

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