Massage machine core shaft rotation type assembly device
The massager core shaft rotary assembly device, which uses a clamping plate for limiting and a rotary motor for coordination, solves the problems of rotational resistance and residual stress caused by high thrust during the core shaft assembly process. It achieves fast and stable assembly, reduces the load on the rotary motor, and ensures the performance of the massager.
Patent Information
- Application Number
- CN202310725111.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-19
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2043-06-19
AI Technical Summary
In the current massager core shaft assembly process, the propulsion structure has a large thrust, which leads to extremely high running resistance and load on the rotating fixed structure. This can easily cause damage to the core shaft and massager components, and the residual stress after assembly affects the massager's performance.
A rotary assembly device for a massager's core shaft is adopted. It utilizes a horizontal limiting clamping plate and a second rotary motor in conjunction with a propulsion structure. The thrust is reduced by an elastic element, and the core shaft is cooled and heated by a temperature-changing device to eliminate internal stress in the tightening structure.
This technology enables the quick screwing of the core shaft into the massager, reducing the load on the rotary motor and preventing damage due to residual stress during vibration testing of the massager after assembly, thus ensuring precise assembly and structural stability.
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Figure CN116673721B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the massage machine processing technical field, specifically a massage machine core shaft rotation type assembly device. BACKGROUND
[0002] The massage machine core shaft assembly device is mainly divided into a core shaft fixing and rotating structure and a pushing structure for pushing the core shaft to the massage machine to be installed structure, and the pushing structure currently applies a constant and large pushing force to the core shaft in the whole process of the core shaft assembly, so that the running resistance and load of the rotating fixing structure are extremely large when the core shaft is completely rotated into the massage machine, and the core shaft and the massage machine components are easily damaged, and the alignment and positioning between the core shaft and the massage machine components are not accurate and fast enough. In addition, after assembly, the residual stress in the core shaft and the corresponding connecting piece easily causes the core shaft and the connecting piece to be damaged during vibration detection of the massage machine, affecting the performance of the massage machine. SUMMARY
[0003] The purpose of the present application is to solve the problem that the pushing force of the core shaft pushing structure is large, so that the running resistance and load of the rotating fixing structure are extremely large when the core shaft is completely rotated into the massage machine, and the core shaft and the massage machine components are easily damaged, and the residual stress in the core shaft and the corresponding connecting piece after assembly easily causes the core shaft and the connecting piece to be damaged during vibration detection of the massage machine, affecting the performance of the massage machine, and to provide a massage machine core shaft rotation type assembly device.
[0004] In order to achieve the above purpose, the present application adopts the following technical scheme: a massage machine core shaft rotation type assembly device, comprising a workbench, a device support is arranged on the workbench, a leveling structure and an assembly device are arranged on the device support, the assembly device comprises a rotating section, a pushing section rotatably connected to the rotating section, and an abutting section fixed to the pushing section through a flange, a core shaft is slidably connected in the pushing section and the abutting section, a pushing structure is rotatably connected in the pushing section, the pushing structure abuts the upper end of the core shaft, a clamping plate is arranged in the pushing section and vertically abuts the outer wall of the core shaft along the circumferential direction of the core shaft, a plurality of temperature changing devices are arranged on the lower end of the abutting section along the circumferential direction of the core shaft, and a fixing device for fixing the massage machine or the massage machine component is further arranged on the workbench.
[0005] Further description of the above technical scheme:
[0006] The device support comprises a plurality of lead screws and a lifting platform rotatably connected to the lead screws, the lead screws are rotatably connected to the output end of a first rotating motor in the workbench, and the leveling structure is arranged at the connection between the lead screw and the lifting platform.
[0007] Further description of the above technical scheme:
[0008] The leveling structure comprises a leveling knob, one end of the leveling knob extends into the lifting platform and is fixed on a rotating disc, one end of the rotating disc is fixed on one end of an eccentric rotating shaft, the opposite end of the eccentric rotating shaft is rotatably connected to a movable block, the movable block is rotatably connected to a screw rod and a threaded hole is arranged at the connection position, the lifting platform is provided with a rotating groove, an arc-shaped movable groove and a movable through hole at corresponding positions of the rotating disc, the eccentric rotating shaft and the movable block in sequence, and the lifting platform and the movable block are relatively displaced by rotating the leveling knob to drive the rotating disc and the eccentric rotating shaft to rotate.
[0009] Further description of the above technical solution:
[0010] The side surface of the movable block is provided with a movable sliding block, and the lifting platform is provided with a movable sliding groove at the corresponding position of the movable sliding block.
[0011] Further description of the above technical solution:
[0012] The rotating section is provided with a second rotating motor for driving the rotation of the advancing section and an output shaft fixed to the upper end of the advancing section.
[0013] Further description of the above technical solution:
[0014] The advancing section is provided with a first guide cavity and a second guide cavity, and the upper end of the first guide cavity is provided with an annular sliding groove.
[0015] Further description of the above technical solution:
[0016] The advancing structure comprises an abutting disc, a plurality of first sleeves fixed on the abutting disc, a second sleeve sleeved in the first sleeve, a base fixed on the second sleeve, elastic members arranged in the first sleeve and the second sleeve, one end of the elastic member being fixed on the abutting disc, the opposite end of the elastic member being fixed on the base, a plurality of sliding blocks being arranged on the base and slidingly connected in the annular sliding groove, the annular sliding groove being provided with a seal for longitudinal positioning of the sliding blocks, and a clamping plate being connected in the second guide cavity through a first telescopic device.
[0017] Further description of the above technical solution:
[0018] The lower end of the abutting section is provided with a gasket, the abutting section is provided with a third guide cavity, the third guide cavity is in communication with the first guide cavity, a machine core shaft is arranged in the third guide cavity and the first guide cavity, and the outer wall of the lower end of the machine core shaft is provided with a thread.
[0019] Further description of the above technical solution:
[0020] The fixing device comprises a plurality of limiting devices and tightening devices, the limiting device comprises a device main body, a limiting groove and a plurality of annular sliding blocks arranged at the lower end of the device main body, a recess is arranged on the workbench, a sliding rod is arranged in the recess, the annular sliding blocks are sleeved and slidably connected on the sliding rod, and the tightening device comprises a second telescopic device and an abutting plate abutting on the device main body.
[0021] As a further description of the above technical solution:
[0022] The axis of the abutting plate and the output end of the second telescopic device is parallel to the axis of the sliding rod.
[0023] As described above, by adopting the above technical solution, the present application has the following beneficial effects compared with the prior art:
[0024] 1、The massage machine core shaft rotating assembly device realizes the rotation of the core shaft through the horizontal limiting of the clamping plate and the second rotating motor, and cooperates with the advancing structure to rotate the core shaft into the massage machine. The elastic member is arranged, and the elastic pushing force is continuously reduced during the downward pushing of the core shaft, so that the pushing speed is rapidly increased before the core shaft is just rotated into the massage machine. When the core shaft is completely rotated in, the contact friction surface of the screw and the screw hole is increased, and the gradually reduced pushing force reduces the resistance between the screw and the screw hole, thereby reducing the working load of the second rotating motor and enabling the core shaft to be quickly rotated in to complete the assembly. The screw is pre-cooled by the temperature changing device, which can reduce the contact area between the core shaft screw and the massage machine screw hole, and further reduce the running resistance and load of the second rotating motor.
[0025] 2、According to the annealing principle, the temperature changing device is used for heating and cooling the tightening structure of the massage machine, so as to eliminate the internal stress of the tightening structure and avoid damage to the connection between the core shaft and the massage machine due to residual stress during the operation and vibration detection of the massage machine, thereby affecting the performance of the massage machine.
[0026] 3、The limiting device and the tightening device which can slide relative to the workbench make the positioning and alignment of the massage machine screw hole and the core shaft screw thread more accurate and flexible. The leveling structure is used to realize the parallelism of the lifting platform relative to the workbench and the massage machine, and the assembly device is perpendicular to the massage machine, which further ensures the accurate alignment of the screw thread. The screw is used to smoothly lift the assembly device. BRIEF DESCRIPTION OF DRAWINGS
[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0028] Figure 1It is a front view sectional view of an assembling device of a massage machine core shaft rotary assembling device.
[0029] Figure 2 It is a front view sectional view of an assembling device of a massage machine core shaft rotary assembling device.
[0030] Figure 3 It is Figure 2 It is a top view sectional view at A in the figure.
[0031] Figure 4 It is a top view of a massage machine core shaft rotary assembling device (hidden device support and assembling device).
[0032] Legend:
[0033] 1, workbench; 11, first rotary motor; 12, groove; 13, sliding rod; 2, device support; 21, screw rod; 22, lifting platform; 221, movable block; 222, movable sliding block; 223, movable sliding groove; 224, threaded hole; 225, arc-shaped movable slot; 23, leveling structure; 231, leveling knob; 232, turntable; 233, eccentric shaft; 3, assembling device; 31, rotating section; 311, second rotary motor; 312, output shaft; 32, pushing section; 321, first guide cavity; 322, second guide cavity; 323, first telescopic device; 324, clamping plate; 325, annular sliding groove; 33, abutting section; 331, third guide cavity; 332, temperature changing device; 333, gasket; 4, fixing device; 41, limiting device; 411, device main body; 412, limiting groove; 413, annular sliding block; 42, tightening device; 421, second telescopic device; 422, abutting plate; 5, core shaft; 51, thread; 6, pushing structure; 61, first sleeve; 62, second sleeve; 63, base; 64, elastic member; 65, sliding block. DETAILED DESCRIPTION
[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.
[0035] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0036] Embodiment one:
[0037] Please refer to Figures 1-4 The present application provides a technical solution: a massage machine core shaft rotating type assembly device, comprising a workbench 1, a device support 2 is arranged on the workbench 1, a leveling structure 23 and an assembly device 3 are arranged on the device support 2, the assembly device 3 comprises a rotating section 31, a propelling section 32 rotatably connected to the rotating section 31, and an abutting section 33 fixed to the propelling section 32 through a flange, a machine core shaft 5 is slidably connected in the propelling section 32 and the abutting section 33, a propelling structure 6 is rotatably connected in the propelling section 32, the propelling structure 6 abuts the upper end of the machine core shaft 5, a clamping plate 324 is arranged in the propelling section 32, which is equidistantly distributed along the circumference of the machine core shaft 5 and perpendicularly abuts the outer wall of the machine core shaft 5, a plurality of temperature changing devices 332 are equidistantly arranged on the lower end of the abutting section 33 along the circumference of the machine core shaft 5, a fixing device 4 for fixing the massage machine or the massage machine component is further arranged on the workbench 1, the machine core shaft is horizontally limited by the clamping plate, and the machine core shaft is rotated by the relative rotation of the rotating section and the propelling section, and the machine core shaft is rotated into the massage machine under the pushing of the propelling structure, the temperature changing device cools the machine core shaft before the machine core shaft is assembled, so that the machine core shaft shrinks, and the machine core shaft is more conveniently and quickly rotated into the massage machine, according to the annealing principle, the rotating structure is sequentially heated and cooled after assembly, so as to eliminate stress and ensure structural stability.
[0038] The device support 2 comprises a plurality of lead screws 21 and a lifting platform 22 rotatably connected to the lead screws 21, the lead screws 21 are rotatably connected to the output end of the first rotary motor 11 in the workbench 1, and the leveling structure 23 is arranged at the connection between the lead screw 21 and the lifting platform 22, so that the assembly device is more convenient and fast to lift.
[0039] The leveling structure 23 comprises a leveling knob 231, one end of the leveling knob 231 extending into the lifting platform 22 and being fixed on a rotating disc 232, one end of the rotating disc 232 being fixed on one end of an eccentric rotating shaft 233, the opposite end of the eccentric rotating shaft 233 being rotatably connected to a movable block 221, the movable block 221 being rotatably connected to the lead screw 21 and the connecting position being provided with a threaded hole 224, the lifting platform 22 being provided with a rotating groove, an arc-shaped movable groove 225 and a movable through hole in sequence at the corresponding positions of the rotating disc 232, the eccentric rotating shaft 233 and the movable block 221, the lifting platform 22 and the movable block 221 being relatively displaced by rotating the leveling knob 231 to drive the rotating disc 232 and the eccentric rotating shaft 233 to rotate, the parallelism of the lifting platform relative to the workbench and the massager being realized by the leveling structure, the assembly device being perpendicular to the massager, and the accurate alignment of the threads being ensured.
[0040] The rotating section 31 is provided with a second rotating motor 311 for driving the rotating of the advancing section 32 and an output shaft 312 fixed on the upper end of the advancing section 32, so as to ensure the rotating stability of the assembly device.
[0041] The advancing section 32 is provided with a first guide cavity 321 and a second guide cavity 322, and the upper end of the first guide cavity 321 is provided with an annular sliding groove 325.
[0042] The advancing structure 6 comprises an abutting disc, a plurality of first sleeves 61 fixed on the abutting disc, a second sleeve 62 sleeved in the first sleeve 61, a base 63 fixed on the second sleeve 62, elastic members 64 provided in the first sleeve 61 and the second sleeve 62, one end of the elastic members 64 being fixed on the abutting disc, the opposite end of the elastic members 64 being fixed on the base 63, a plurality of sliding blocks 65 provided on the base 63 and slidingly connected in the annular sliding groove 325, the annular sliding groove 325 being provided with a sealing portion for longitudinally limiting the sliding blocks 65, so that the advancing structure is more stable in downward pushing force on the core shaft, and the second guide cavity 322 is connected with a clamping plate 324 through a first telescopic device 323, so that the core shaft is more firmly horizontally fixed and the rotating assembly efficiency of the core shaft is higher.
[0043] The lower end of the abutting section 33 is provided with a gasket 333, the abutting section 33 is provided with a third guide cavity 331, the third guide cavity 331 being communicated with the first guide cavity 321, the core shaft 5 being arranged in the third guide cavity 331 and the first guide cavity 321, and the outer wall of the lower end of the core shaft 5 being provided with threads 51.
[0044] The fixing device 4 comprises a plurality of limiting devices 41 and tightening devices 42. The limiting device 41 comprises a device body 411, a limiting groove 412 and a plurality of annular sliding blocks 413 arranged at the lower end of the device body 411. The workbench 1 is provided with a recess 12, and the recess 12 is provided with a sliding rod 13. The annular sliding block 413 is sleeved and slidably connected on the sliding rod 13. The tightening device 42 comprises a second telescopic device 421 and an abutting plate 422 abutting on the device body 411. Through the limiting device and the tightening device which can slide relative to the workbench, the threaded positioning and alignment of the massage device screw hole and the machine core shaft are more accurate and flexible.
[0045] Embodiment two:
[0046] Please refer to Figure 3 On the basis of the above-mentioned embodiment one, preferably, the side surface of the movable block 221 is provided with a movable sliding block 222, and the movable sliding groove 223 is arranged at the corresponding position of the movable sliding block 222, so that the leveling of the lifting platform is more accurate and smooth, and the precise positioning and alignment of the massage device screw hole and the machine core shaft are ensured.
[0047] Embodiment three:
[0048] Please refer to Figure 4 On the basis of the above-mentioned embodiment one, preferably, the axis of the abutting plate 422 and the output end of the second telescopic device 421 is parallel to the axis of the sliding rod 13, so that the movement of the limiting device is more smooth and convenient.
[0049] The working principle of the massage machine core shaft rotating assembly device of the embodiment includes: rotating the leveling knob 231 to drive the rotating disc 232 and the eccentric rotating shaft 233 to rotate, so that the lifting platform 22 and the movable block 221 are relatively displaced, the assembly device 3 is perpendicular to the workbench 1 and the fixing device 4, the screw 51 of the core shaft 5 is inserted into the third guide cavity 331 and the first guide cavity 321 downward, the first telescopic device 323 is started, so that the clamping plate 324 abuts against the outer wall of the core shaft 5 to limit it, the massage machine or the massage machine component is placed between the plurality of limiting devices 41, the second telescopic device 421 is started, so that the abutting plate 422 pushes the limiting device 41, so that the limiting groove 412 of the limiting device 41 fixes the massage machine, and further pushes the massage machine to align the structure to be installed on the core shaft 5, the temperature changing device 332 is started to cool the screw thread on the core shaft 5, so that it shrinks, the first rotating motor 11 is started, so that the screw rod 21 drives the lifting platform 22 and the assembly device 3 to move downward to the abutting section 33 which is sleeved on the structure to be installed on the massage machine and is abutted and fixed, the second rotating motor 311 is started, the horizontal clamping of the clamping plate 324 on the core shaft 5 is cooperated, the screw 51 is rotated, and the screw 51 is continuously screwed into the threaded hole of the structure to be installed through the pushing of the pushing structure 6, after the assembly is completed, according to the annealing principle, the temperature changing device 332 is used to heat the screwed structure between the core shaft and the massage machine, and natural standing cooling or temperature changing device 332 cooling is used to realize stress relief of the screwed structure, avoid damage of the connection between the core shaft and the massage machine due to residual stress when the massage machine runs and vibrates, affect the performance of the massage machine, and then the first rotating motor 11 and the first telescopic device 323 are operated to separate the core shaft 5 from the assembly device 3, and the second telescopic device 421 is operated to take out the assembled core shaft 5 and the massage machine component.
[0050] In summary, due to the adoption of the above technical scheme, the massage machine core shaft rotating assembly device of the embodiment has the following beneficial effects compared with the prior art:
[0051] 1、The massage machine core shaft rotating assembly device realizes the rotation of the core shaft through the horizontal limiting of the clamping plate and the second rotating motor, cooperates with the pushing structure to screw the core shaft into the massage machine, sets the elastic member, the elastic pushing force continuously decreases during the downward pushing of the core shaft, so that the pushing speed is rapidly before the core shaft is screwed into the massage machine, when the core shaft is completely screwed in, the contact friction surface between the screw and the screw hole increases, and the gradually decreasing pushing force reduces the resistance between the screw and the screw hole, thereby reducing the working load of the second rotating motor and enabling the core shaft to be quickly screwed in to complete the assembly. The temperature changing device is used to precool the screw, which can reduce the contact area between the core shaft screw and the massage machine screw hole, further reducing the operation resistance and load of the second rotating motor.
[0052] 2、According to annealing principle, through temperature changing device, the temperature of the massage machine is increased and decreased, the internal stress of the screwing structure is eliminated, the damage of the massage machine caused by the residual stress when the massage machine is running and vibrating is avoided, and the performance of the massage machine is affected.
[0053] 3、Through the limiting device and the tightening device which can slide relative to the workbench, the positioning and alignment of the massage machine screw hole and the core shaft thread are more accurate and flexible, the lifting platform is parallel to the workbench and the massage machine through the leveling structure, the assembling device is vertical to the massage machine, the accurate alignment of the thread is further ensured, and the smooth lifting of the assembling device is realized through the screw.
[0054] The above is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.
Claims
1. A massage machine core shaft rotation type assembly device, characterized by, The device is characterized by comprising a workbench (1), a device support (2) arranged on the workbench (1), a leveling structure (23) and an assembling device (3) arranged on the device support (2), the assembling device (3) comprising a rotating section (31), a pushing section (32) rotatably connected to the rotating section (31), and an abutting section (33) fixed to the pushing section (32) through a flange, a machine core shaft (5) slidably connected in the pushing section (32) and the abutting section (33), a pushing structure (6) rotatably connected in the pushing section (32) and abutting the upper end of the machine core shaft (5), a clamping plate (324) arranged on the outer wall of the machine core shaft (5) and vertically abutting the machine core shaft (5) at equal intervals along the circumference of the machine core shaft (5), and a plurality of temperature changing devices (332) arranged at equal intervals along the circumference of the machine core shaft (5) at the lower end of the abutting section (33), and a fixing device (4) for fixing a massager or a massager component arranged on the workbench (1). The pushing section (32) is provided with a first guide cavity (321) and a second guide cavity (322), and the upper end of the first guide cavity (321) is provided with an annular sliding groove (325). The pushing structure (6) comprises an abutting disc, a plurality of first sleeves (61) fixed to the abutting disc, a second sleeve (62) sleeved in the first sleeve (61), and a base (63) fixed to the second sleeve (62), wherein elastic members (64) are arranged in the first sleeve (61) and the second sleeve (62), one end of the elastic member (64) is fixed to the abutting disc, the other end of the elastic member (64) opposite to the one end is fixed to the base (63), a plurality of sliding blocks (65) are arranged on the base (63), the sliding blocks (65) are slidably connected in the annular sliding groove (325), the annular sliding groove (325) is provided with a seal for limiting the longitudinal position of the sliding blocks (65), and the second guide cavity (322) is connected with the clamping plate (324) through a first telescopic device (323).
2. The massage machine core shaft rotating assembly device according to claim 1, characterized in that, The device support (2) comprises a plurality of lead screws (21) and a lifting platform (22) rotatably connected to the lead screws (21), the lead screws (21) are rotatably connected to the output end of a first rotary motor (11) arranged in the workbench (1), and the leveling structure (23) is arranged at the connection between the lead screw (21) and the lifting platform (22).
3. The massage machine core shaft rotating assembly device according to claim 2, characterized in that, The leveling structure (23) comprises a leveling knob (231), one end of the leveling knob (231) extends into the lifting platform (22) and is fixed on a rotating disc (232), one end of the rotating disc (232) is fixed on one end of an eccentric shaft (233), the opposite end of the eccentric shaft (233) is rotatably connected to a movable block (221), the movable block (221) is rotatably connected to the lead screw (21) and a threaded hole (224) is arranged at the connection position, the lifting platform (22) is sequentially provided with a rotating groove, an arc-shaped movable groove (225) and a movable through hole at the corresponding positions of the rotating disc (232), the eccentric shaft (233) and the movable block (221), the lifting platform (22) and the movable block (221) are relatively displaced by rotating the leveling knob (231) to drive the rotating disc (232) and the eccentric shaft (233) to rotate.
4. The massage machine core shaft rotating assembly device according to claim 3, characterized in that, The side surface of the movable block (221) is provided with a movable sliding block (222), and the lifting platform (22) is provided with a movable sliding groove (223) at the corresponding position of the movable sliding block (222).
5. The massage machine core shaft rotating assembly device according to claim 1, characterized in that, The rotating section (31) is provided with a second rotating motor (311) for driving the advancing section (32) to rotate and an output shaft (312) fixed on the upper end of the advancing section (32).
6. The massage machine core shaft rotating assembly device according to claim 1, characterized in that, The lower end of the abutting section (33) is provided with a gasket (333), the abutting section (33) is provided with a third guide cavity (331), the third guide cavity (331) is in communication with the first guide cavity (321), the machine core shaft (5) is arranged in the third guide cavity (331) and the first guide cavity (321), and the outer wall of the lower end of the machine core shaft (5) is provided with a thread (51).
7. The massage machine core shaft rotating assembly device according to claim 1, characterized in that, The fixing device (4) comprises a plurality of limiting devices (41) and a tightening device (42), the limiting device (41) comprises a device body (411), a limiting groove (412) and a plurality of annular sliding blocks (413) arranged at the lower end of the device body (411), the workbench (1) is provided with a recess (12), the recess (12) is provided with a sliding rod (13), the annular sliding blocks (413) are sleeved and slidably connected on the sliding rod (13), and the tightening device (42) comprises a second telescopic device (421) and an abutting plate (422) abutting on the device body (411).
8. The massage machine core shaft rotating assembly device according to claim 7, characterized in that, The axis of the abutting plate (422) and the output end of the second telescopic device (421) is parallel to the axis of the sliding rod (13).
Citation Information
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