Beauty instrument

By introducing a guide groove of the limiting device into the beauty instrument, the problem of large vibration and weak thrust of the water-optic instrument push rod mechanism is solved, and the stable movement of the push rod and thrust strengthening are achieved, ensuring the effective role of the beauty instrument working part.

CN222585351UActive Publication Date: 2025-03-11SHENZHEN JINMO TECH CO LTD
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Patent Information

Application Number
CN202420660875.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-01
Publication Date
2025-03-11
Estimated Expiration
2034-04-01

AI Technical Summary

Technical Problem

The push rod mechanism of the water-light instrument has a large vibration and weak thrust, which affects the effect of the beauty instrument working part.

Method used

A beauty instrument is designed, and the guide groove of the limiting device is used to guide the push rod to move stably in a straight line, reducing vibration and strengthening thrust.

Benefits of technology

Through the use of the limiting device, the vibration of the push rod mechanism is reduced and the thrust is strengthened, thereby ensuring the effective role of the beauty instrument working part.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a beauty instrument. The beauty instrument comprises a shell; the push rod is movably arranged on the shell, and one end of the push rod is a pushing end acting on the working part of the beauty instrument; the motor is arranged in the shell and located on one side of the push rod, and the axis direction of the motor is parallel to the moving direction of the push rod; the transmission wheel is arranged on an output shaft of the motor and is connected with the push rod; the limiting device is arranged on the shell, a guide groove is formed in the limiting device, and the push rod penetrates through the guide groove and is in sliding fit with the guide groove. According to the beauty instrument, the vibration of the push rod mechanism is reduced, and the thrust is strengthened, so that the acting effect of the working part of the beauty instrument is ensured.
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Description

Technical Field

[0001] The utility model relates to the technical field of beauty instruments, in particular to a beauty instrument. Background Art

[0002] In the new era, the beauty instrument industry has ushered in unprecedented development opportunities, and beauty instrument products have gradually entered people's daily lives. As one of the many types of beauty instruments, the water light instrument uses micro needles to penetrate the skin at high speed, allowing the active ingredients of the essence to penetrate effectively, stimulating collagen proliferation and cell regeneration, repairing aging cells, and thus achieving beauty effects.

[0003] In order to achieve motion control of working parts such as microneedles, hyaluronic acid devices are usually equipped with a push rod mechanism, which includes a motor, a cam and a push rod. When the motor drives the cam to rotate to drive the push rod to move, the push rod will produce a certain inclination angle along the cam, and will not move completely in a straight line, resulting in increased vibration and weakened thrust, which affects the effect of the working part of the beauty instrument. Utility Model Content

[0004] The main purpose of the utility model is to provide a beauty instrument, aiming to solve the technical problems of large vibration and weak thrust of the push rod mechanism of the current water light instrument.

[0005] To achieve the above object, the utility model provides a beauty instrument, which includes:

[0006] case;

[0007] A push rod is movably disposed in the housing, one end of the push rod being a pushing end for acting on a beauty component of the beauty instrument;

[0008] A motor is disposed in the housing and located on one side of the push rod, wherein the axis direction of the motor is parallel to the moving direction of the push rod;

[0009] A transmission wheel, disposed on the output shaft of the motor and connected to the push rod;

[0010] The limiting device is arranged on the shell, and the limiting device is provided with a guide groove, and the push rod is passed through the guide groove and slidably cooperates with the guide groove.

[0011] In some embodiments, the limiting device includes a limiting seat;

[0012] The guide groove is constructed on the limit seat, and one end of the limit seat is provided with a groove for the push rod to be installed in the guide groove. The bottom wall of the guide groove is provided with a through hole connected to the guide groove, and the pushing end of the push rod passes through the through hole to the other end of the limit seat.

[0013] In some embodiments, a plurality of guide support portions are protruding from the groove side wall of the guide groove, and the plurality of guide support portions are arranged along the circumferential direction of the push rod to support the push rod.

[0014] In some embodiments, the limit seat is detachably installed in the shell, a slot is provided on the side of the limit seat, and a holding protrusion is provided on the inner wall of the shell. The holding protrusion is held in the slot to fix the limit seat.

[0015] In some embodiments, a mounting groove is provided in the housing, and the mounting groove is located in the extension direction of the pushing end of the push rod.

[0016] In some embodiments, the limit seat is provided with a wire passage opening connected to the installation groove.

[0017] In some embodiments, the following also include:

[0018] A transmission rod, located between the transmission wheel and the push rod, one end of the transmission rod forms a spherical hinge with the transmission wheel and deviates from the rotation axis of the transmission wheel, and the other end forms a spherical hinge with the push rod;

[0019] Wherein, the rotation axis of the transmission wheel is not colinear with the central axis of the push rod.

[0020] In some embodiments, the transmission rod has a first spherical connection portion at one end and a second spherical connection portion at the other end;

[0021] The transmission wheel is provided with a first spherical groove, the first spherical connecting part is installed in the first spherical groove and rotatably cooperates with the first spherical groove; the push rod is provided with a second spherical groove, the second spherical connecting part is installed in the second spherical groove and rotatably cooperates with the second spherical groove.

[0022] In some embodiments, the transmission wheel includes a first wheel portion and a second wheel portion that are detachably connected, the first wheel portion is provided with a first half groove, the second wheel portion is provided with a second half groove, and the first half groove is connected to the second half groove to form the first spherical groove in combination.

[0023] In some embodiments, the push rod includes a first rod portion and a second rod portion that are detachably connected, the first rod portion is provided with a third half groove, the second rod portion is provided with a fourth half groove, and the third half groove is connected to the fourth half groove to form the second spherical groove.

[0024] When the beauty instrument of the utility model is working, the transmission wheel is driven to rotate by the motor, thereby driving the push rod to move, and the push end of the push rod acts on the working part of the beauty instrument (such as micro needles) to push it to move. In the process of the movement of the push rod, the guide groove of the limit device guides the push rod to move stably along a straight line. Compared with the prior art, the beauty instrument of the utility model reduces the vibration of the push rod mechanism and strengthens the thrust, thereby ensuring the effect of the working part of the beauty instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of a beauty instrument in one embodiment of the utility model;

[0026] Figure 2 for Figure 1 Schematic diagram of the internal structure of the beauty instrument in the embodiment;

[0027] Figure 3 for Figure 1 A schematic diagram of the structure of a part of the beauty instrument in the embodiment;

[0028] Figure 4 for Figure 1 An exploded view of another part of the beauty instrument in the embodiment;

[0029] Figure 5 for Figure 1 A schematic diagram of the structure of the limit seat in the embodiment;

[0030] Figure 6 for Figure 1 A schematic diagram of the structural disassembly of the transmission wheel in the embodiment;

[0031] Figure 7 for Figure 1 Schematic diagram of the structural disassembly of the push rod in the embodiment. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0035] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0036] The utility model provides a beauty instrument, referring to Figure 1 and Figure 2 The beauty instrument at least includes: a housing 110; a push rod 120, which is movably arranged in the housing 110, and one end of the push rod 120 is a pushing end acting on the working part of the beauty instrument; a motor 130, which is arranged in the housing 110 and is located on one side of the push rod 120, and the axial direction of the motor 130 is parallel to the moving direction of the push rod 120; a transmission wheel 140, which is arranged on the output shaft of the motor and connected to the push rod 120; a limiting device 150, which is arranged in the housing 110, and the limiting device 150 is provided with a guide groove 10, and the push rod 120 is penetrated by the guide groove 10 and slidably cooperates with the guide groove 10.

[0037] In this embodiment, the shape of the shell 110 can be cylindrical, etc., and can be set according to actual conditions. The shell 110 is used to set structures such as the push rod 120, the motor 130, and the limit device 150. When the beauty instrument is working, the motor 130 drives the transmission wheel 140 to rotate, thereby driving the push rod 120 to move, and the pushing end of the push rod 120 acts on the working part of the beauty instrument to promote its movement. The working part of the beauty instrument involved can be a microneedle. In addition, it can also be a massage component, etc., which acts on the surface of human skin. Specifically, taking the working part of the beauty instrument as a microneedle as an example, the microneedle of the beauty instrument is located on the moving path of the pushing end of the push rod 120. During the reciprocating motion of the push rod 120, the pushing end of the push rod 120 continuously moves toward or away from the microneedle. Among them, the axial direction of the motor 130 is parallel to the moving direction of the push rod 120, that is, the push rod 120 mechanism adopts a linear layout. Optionally, such as Figure 2As shown, the push rod 120 is vertically arranged and can move on the housing 110, the motor 130 is located below the push rod 120, and the output shaft of the motor 130 is vertically arranged upward and connected to the push rod 120 through the installed transmission wheel 140. The wheel body structure of the transmission wheel 140 can be an eccentric wheel or a cam, and when the transmission wheel 140 adopts different wheel body structures, auxiliary components can be configured accordingly to achieve the reciprocating movement of the push rod 120. For example, when the transmission wheel 140 is an eccentric wheel, a transmission rod can be correspondingly arranged between the transmission wheel 140 and the push rod 120 for connection; for another example, when the transmission wheel 140 is a cam, a return spring can be correspondingly arranged to apply an elastic force to the push rod 120 so that the push rod 120 and the transmission wheel 140 maintain elastic contact.

[0038] The guide groove 10 on the limit device 150 is adapted to the push rod 120, and the push rod 120 can slide on the limit device 150 by slidingly cooperating with the guide groove 10. The structural composition and structural form of the limit device 150 are not limited. The limit device 150 can be a single structural member or a combination of multiple structural members, and the guide groove 10 can be one or more, which can be set according to actual conditions.

[0039] Among them, during the movement of the push rod 120, the guide groove 10 of the limit device 150 guides the push rod 120 to move so that the push rod 120 moves stably along a straight line. Compared with the prior art, this beauty instrument reduces the vibration of the push rod 120 mechanism and strengthens the thrust, thereby ensuring the skin-breaking effect of the microneedle.

[0040] The beauty instrument involved in this embodiment may be a water light instrument, including but not limited to this, and those skilled in the art may set it according to actual conditions.

[0041] In some embodiments, reference Figure 3 and Figure 4 , the limiting device 150 includes a limiting seat 151;

[0042] A guide groove 10 is constructed on the limit seat 151, and the notch of the guide groove 10 is arranged at one end of the limit seat 151 for the push rod 120 to be installed in the guide groove 10. The bottom wall of the guide groove 10 is provided with a through hole 20 connected to the guide groove 10, and the pushing end of the push rod 120 passes through the through hole 20 to the other end of the limit seat 151.

[0043] Specifically, the limit seat 151 is fixedly arranged in the housing 110, and the bottom wall of the guide groove 10 thereof is opposite to the notch, the push rod 120 is inserted into the guide groove 10 from the notch, and the pushing end of the push rod 120 passes through the through hole 20 of the bottom wall of the groove. Among them, the push rod 120 can be a special-shaped structure, the push rod 120 includes a push rod seat and a push rod part extending from the end surface of the push rod seat, the push rod part constitutes the pushing end of the push rod 120, the size of the push rod seat is larger than the size of the push rod part, that is, the push rod seat is slidably matched with the guide groove 10 in the guide groove 10, and the push rod part passes through the through hole 20 accordingly. The detachable setting mode of the limit seat 151 in the housing 110 can include screw connection, clamping, etc., which is set according to actual conditions. The guide groove 10 is constructed by the set limit seat 151, and the push rod 120 can move stably along a straight line on the limit seat 151.

[0044] In some embodiments, reference Figure 5 A plurality of guide support portions 152 are convexly disposed on the side wall of the guide groove 10 , and the plurality of guide support portions 152 are arranged along the circumferential direction of the push rod 120 to support the push rod 120 .

[0045] The plurality of guide support portions 152 enclose a moving space for the push rod 120. One side of the guide support portion 152 is butted against the bottom wall of the guide groove 10, and the other side extends to the notch. The free end of the guide support portion 152 away from the groove side wall of the guide groove 10 is a support end, which contacts the push rod 120 to support the push rod 120. When the motor 130 outputs a driving force to drive the push rod 120, the push rod 120 moves along the guide support portion 152 in the guide groove 10 and is then guided. The plurality of guide support portions 152 are evenly spaced in the circumferential direction, and the spacing between any two adjacent guide support portions 152 is the same.

[0046] In some embodiments, the limit seat 151 is detachably installed in the shell 110, a slot 151A is provided on the side of the limit seat 151, and a retaining protrusion 110A is provided on the inner wall of the shell 110. The retaining protrusion 110A is retained in the slot 151A to fix the limit seat 151.

[0047] Specifically, the housing 110 realizes the installation and fixation of the limit seat 151 by the clamping cooperation of the clamping protrusion 110A and the clamping groove 151A on the limit seat 151, and the limit seat 151 cannot move along the axial direction of the housing 110. Among them, the clamping groove 151A is circumferentially arranged along the side of the limit seat, and the clamping protrusion 110A can be an annular protrusion arranged along the inner wall of the housing 110. Optionally, there are two clamping protrusions 110A, and the two clamping protrusions 110A are arranged at intervals along the axial direction of the housing 110. When the two clamping protrusions 110A are located in the clamping groove 151A, one of the clamping protrusions 110A abuts against the upper groove wall of the clamping groove 151A, and the other clamping protrusion 110A abuts against the lower groove wall of the clamping groove 151A, thereby realizing the clamping cooperation with the clamping groove 151A.

[0048] In some embodiments, reference Figures 1 to 3 A mounting groove 111 is provided in the housing 110 , and the mounting groove 111 is located in the extending direction of the pushing end of the push rod 120 .

[0049] The mounting groove 111 can be used to mount a microneedle or an essence bottle. The mounting groove 111 is located in the extension direction of the pushing end of the push rod 120. The microneedle is mounted in the mounting groove 111. When the push rod 120 moves toward the mounting groove 111, the pushing end of the push rod 120 pushes the microneedle accordingly.

[0050] In some embodiments, reference Figures 3 to 5 The limiting seat 151 is provided with a wire passing opening 151B which is communicated with the mounting groove 111 .

[0051] When the microneedle is installed in the mounting groove 111, it can be routed through the wire opening 151B of the limiting seat 151 to be electrically connected to the control circuit board (not shown) of the beauty instrument, wherein the control circuit board is arranged on the side of the motor 130 away from the push rod 120. Optionally, the wire opening 151B can be arranged at the edge of the limiting seat 151 in the form of a notch. The number of the wire openings 151B can be two, including but not limited to this, and can be set according to actual conditions.

[0052] In some embodiments, reference Figure 2 and Figure 3 , the beauty instrument also includes:

[0053] The transmission rod 160 is located between the transmission wheel 140 and the push rod 120. One end of the transmission rod 160 forms a spherical hinge with the transmission wheel 140 and deviates from the rotation axis of the transmission wheel 140, and the other end forms a spherical hinge with the push rod 120.

[0054] The rotation axis of the transmission wheel 140 is not colinear with the center axis of the push rod 120 .

[0055] In this embodiment, the transmission wheel 140 installed on the output shaft of the motor 130 is connected to the push rod 120 through the transmission rod 160, and the two ends of the transmission rod 160 are spherically hinged with the transmission wheel 140 and the push rod 120 respectively. Because one end of the transmission rod 160 connected to the transmission wheel 140 deviates from the rotation axis of the transmission wheel 140, when the motor 130 drives the transmission wheel 140 to rotate, it will drive the transmission rod 160 to perform a circular motion. And because the rotation axis of the transmission wheel 140 and the central axis of the push rod 120 are not colinear, when the transmission wheel 140 rotates, the transmission rod 160 also rotates accordingly to extend or retract in the moving direction of the push rod 120, thereby driving the push rod 120 to extend, move or retract. In actual operation, when the motor 130 drives the transmission wheel 140 to rotate one circle, the transmission rod 160 rotates to extend once and retract once in the moving direction of the push rod 120, thereby driving the push rod 120 to extend once and retract once. The motor 130 only needs to rotate in one direction, such as forward rotation, to cause the push rod 120 to reciprocate.

[0056] In some embodiments, reference Figure 4 , Figure 6 and Figure 7 , a first spherical connecting portion 161 is provided at one end of the transmission rod 160, and a second spherical connecting portion 162 is provided at the other end;

[0057] The transmission wheel 140 is provided with a first spherical groove 141, and the first spherical connecting portion 161 is installed in the first spherical groove 141 and rotatably cooperates with the first spherical groove 141; the push rod 120 is provided with a second spherical groove 121, and the second spherical connecting portion 162 is installed in the second spherical groove 121 and rotatably cooperates with the second spherical groove 121.

[0058] Specifically, the first spherical connection part 161 at one end of the transmission rod 160 is installed in the first spherical groove 141 of the transmission wheel 140 and can rotate freely in the first spherical groove 141 to form a spherical hinge with the transmission wheel 140; the second spherical connection part 162 at the other end of the transmission rod 160 is installed in the second spherical groove 121 of the push rod 120 and can rotate freely in the second spherical groove 121 to form a spherical hinge with the push rod 120. In this embodiment, the first spherical connection part 161 of the transmission rod 160 forms rolling friction in the first spherical groove 141 of the transmission wheel 140, and the second spherical connection part 162 forms rolling friction in the second spherical groove 121 of the push rod 120. Compared with sliding friction, the resistance is smaller, and the transmission is smoother, more flexible and more stable.

[0059] In some embodiments, reference Figure 6The transmission wheel 140 includes a first wheel portion 1401 and a second wheel portion 1402 that are detachably connected. The first wheel portion 1401 is provided with a first half groove 141A, and the second wheel portion 1402 is provided with a second half groove 141B. The first half groove 141A and the second half groove 141B are connected to each other to form a first spherical groove 141.

[0060] The transmission wheel 140 adopts a structural setting of a first wheel portion 1401 and a second wheel portion 1402. The first wheel portion 1401 and the second wheel portion 1402 can be connected by a detachable connection method such as screw connection, snap connection, etc., which is set according to actual conditions. The first half groove 141A of the first wheel 1401 and the second half groove 141B of the second wheel 1402 are connected to form the first spherical groove 141. In practical application, the first spherical connecting portion 161 of the transmission rod 160 is placed in the first half groove 141A of the first wheel 1401, and the second wheel 1402 is connected to the first wheel 1401, and the second half groove 141B is connected to the first half groove 141A, so as to connect the transmission wheel 140 and the transmission rod 160. By disassembling the first wheel 1401 and the second wheel 1402, the first spherical groove 141 can be divided into two, and the first spherical connecting portion 161 of the transmission rod 160 can be taken out from the first spherical groove 141, so as to separate the transmission wheel 140 and the transmission rod 160, which is convenient for installation and disassembly. Optionally, the output shaft of the motor 130 is connected to the first wheel 1401 or the second wheel 1402 of the transmission wheel 140.

[0061] In some embodiments, reference Figure 7 The push rod 120 includes a first rod portion 1201 and a second rod portion 1202 that are detachably connected. The first rod portion 1201 is provided with a third half groove 121A, and the second rod portion 1202 is provided with a fourth half groove 121B. The third half groove 121A and the fourth half groove 121B are connected to each other to form a second spherical groove 121.

[0062] The push rod 120 adopts a structural setting of a first rod portion 1201 and a second rod portion 1202. The first rod portion 1201 and the second rod portion 1202 can be connected by a detachable connection method such as a screw connection and a snap connection, which is set according to actual conditions. The third half groove 121A of the first rod portion 1201 and the fourth half groove 121B of the second rod portion 1202 are connected and combined to form the second spherical groove 121. In actual application, the second spherical connecting portion 162 of the transmission rod 160 is placed in the third half groove 121A of the first rod portion 1201, and then the second rod portion 1202 is connected to the first rod portion 1201, and the fourth half groove 121B corresponds to the third half groove 121A, so as to connect the push rod 120 and the transmission rod 160. By disassembling the first rod portion 1201 and the second rod portion 1202, the second spherical groove 121 can be divided into two, and the second spherical connecting portion 162 of the transmission rod 160 can be taken out from the second spherical groove 121, thereby separating the push rod 120 and the transmission rod 160, which is convenient for installation and disassembly.

[0063] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A beauty instrument, characterized in that: include: case; A push rod is movably disposed in the housing, one end of the push rod being a pushing end acting on the working part of the beauty instrument; A motor is disposed in the housing and located on one side of the push rod, wherein the axis direction of the motor is parallel to the moving direction of the push rod; A transmission wheel, disposed on the output shaft of the motor and connected to the push rod; The limiting device is arranged on the shell, and the limiting device is provided with a guide groove, and the push rod is passed through the guide groove and slidably cooperates with the guide groove.

2. The beauty instrument according to claim 1, characterized in that: The limiting device includes a limiting seat; The guide groove is constructed on the limit seat, and one end of the limit seat is provided with a groove for the push rod to be installed in the guide groove. The bottom wall of the guide groove is provided with a through hole connected to the guide groove, and the pushing end of the push rod passes through the through hole to the other end of the limit seat.

3. The beauty instrument according to claim 2, characterized in that: A plurality of guide support portions are convexly disposed on the groove side wall of the guide groove, and the plurality of guide support portions are arranged along the circumferential direction of the push rod to support the push rod.

4. The beauty instrument according to claim 2, characterized in that: The limiting seat is detachably installed in the shell, a clamping groove is arranged on the side of the limiting seat, and a clamping protrusion is arranged on the inner wall of the shell. The clamping protrusion is clamped in the clamping groove to fix the limiting seat.

5. The beauty instrument according to claim 2, characterized in that: A mounting groove is arranged in the shell, and the mounting groove is located in the extending direction of the pushing end of the push rod.

6. The beauty instrument according to claim 5, characterized in that: The limiting seat is provided with a wire passing opening which is communicated with the mounting groove.

7. The beauty instrument according to any one of claims 1 to 6, characterized in that: Also includes: A transmission rod, located between the transmission wheel and the push rod, one end of the transmission rod forms a spherical hinge with the transmission wheel and deviates from the rotation axis of the transmission wheel, and the other end forms a spherical hinge with the push rod; Wherein, the rotation axis of the transmission wheel is not colinear with the central axis of the push rod.

8. The beauty instrument according to claim 7, characterized in that: One end of the transmission rod is provided with a first spherical connection portion, and the other end is provided with a second spherical connection portion; The transmission wheel is provided with a first spherical groove, the first spherical connecting part is installed in the first spherical groove and rotatably cooperates with the first spherical groove; the push rod is provided with a second spherical groove, the second spherical connecting part is installed in the second spherical groove and rotatably cooperates with the second spherical groove.

9. The beauty instrument according to claim 8, characterized in that: The transmission wheel includes a first wheel portion and a second wheel portion which are detachably connected, the first wheel portion is provided with a first half groove, the second wheel portion is provided with a second half groove, and the first half groove and the second half groove are connected to form the first spherical groove.

10. The beauty instrument according to claim 8, characterized in that: The push rod includes a first rod portion and a second rod portion which are detachably connected, the first rod portion is provided with a third half groove, the second rod portion is provided with a fourth half groove, and the third half groove is connected with the fourth half groove to form the second spherical groove.