A permanent makeup device with secondary fastening

Abstract

The application discloses a tattooing instrument with secondary fastening, which comprises an operating handle and a tattooing head connected with the operating handle, the top of the tattooing head is provided with a first connecting end, the bottom of the operating handle is provided with a first fastener, and the first fastener is detachably connected with the first connecting end, characterized in that the bottom outer surface of the first connecting end is provided with a second connecting end, the outer portion of the operating handle is provided with a second fastener, and the second fastener is detachably connected with the second connecting end. The application improves the fastening stability of the operating handle and the tattooing head, prevents the tattooing head from loosening, reduces the security risks in the operation process, and improves the safety and accuracy in the tattooing process.

Description

Technical Field

[0001] This invention relates to a permanent makeup instrument, and more particularly to a permanent makeup instrument with a secondary fastening mechanism. Background Technology

[0002] Permanent makeup is a cosmetic procedure that involves penetrating the skin to apply pigment, reaching a certain depth, and leaving a lasting effect for months to years. During the procedure, the permanent makeup device is temporarily fixed to the permanent makeup needle assembly via fastening components to continuously provide the force for the needles to penetrate. Existing permanent makeup devices and their corresponding needle assemblies are relatively simple in their temporary fixation methods, generally using a single type of structure, such as elastic anti-slip parts, rotating locks, or threaded structures, to provide resistance in one direction to prevent loosening.

[0003] Because the needle assembly of the permanent makeup machine provides power for a long duration and vibrates at a high frequency, the needle assembly is very prone to loosening during operation. This often results in pigment entering the fastening port of the machine and contaminating it, or even the needle assembly flying off and injuring the user or operator, posing a safety hazard. Furthermore, because it only uses a single fastening method, misalignment of the central axis may occur during installation and use, affecting the stability of subsequent operations, impacting the effectiveness, and increasing the risk of loosening. Summary of the Invention

[0004] The purpose of this invention is to provide a permanent makeup instrument with a secondary fastening mechanism. By using this structure, it is possible to effectively prevent loosening during operation, thereby ensuring the stability of the operation and improving the safety of use.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a permanent makeup instrument with secondary fastening, comprising an operating handle and a permanent makeup head connected to the operating handle, wherein the top of the permanent makeup head is provided with a first docking end, the bottom of the operating handle is provided with a first fastener, the first fastener is detachably connected to the first docking end, a second docking end is provided on the bottom outer surface of the first docking end, and a second fastener is installed on the outside of the operating handle, the second fastener being detachably connected to the second docking end.

[0006] In the above technical solution, the outer surface of the second mating end is provided with an external thread, the bottom inner wall of the second fastener is provided with an internal thread, and the second fastener is screwed to the external thread of the second mating end via the internal thread.

[0007] In the above technical solution, the middle outer wall of the operating handle is provided with a first external thread, the top inner wall of the second fastener is provided with a first internal thread, and the second fastener is screwed to the first external thread of the operating handle via the first internal thread.

[0008] In the above technical solution, a limiting ring is provided on the outer wall of the middle part of the operating handle, and an annular gap is provided between the limiting ring and the first external thread. An annular groove is provided on the inner wall of the limiting ring, and the annular groove is set directly opposite the first external thread. An annular protrusion is provided on the top outer edge surface of the second fastener, and the annular protrusion is movably disposed in the annular groove.

[0009] In the above technical solution, the first mating end has a through hole inside, and the bottom of the first fastener is inserted into the through hole.

[0010] In the above technical solution, at least one set of elastic sealing rings is provided between the first fastener and the through hole, and at least one set of annular mounting grooves is provided on the bottom outer edge surface of the first fastener. The inner end of each set of elastic sealing rings is installed in one set of annular mounting grooves, and the outer wall of the elastic sealing rings abuts against the inner wall of the through hole.

[0011] In the above technical solution, two sets of snap-fit ​​parts are symmetrically provided on the bottom outer surface of the first fastener, and two sets of slots are symmetrically provided on the inner wall of the through hole, and the snap-fit ​​parts are snap-fitted and connected to the slots.

[0012] In the above technical solution, the top of the first mating end is provided with a top thread, the bottom of the first fastener is provided with a bottom thread, and the first mating end and the first fastener are screwed together by the top thread and the bottom thread.

[0013] In the above technical solution, the thread direction of the top thread and the bottom thread is opposite to the thread direction of the internal thread and the external thread.

[0014] In the above technical solution, the top thread is a top internal thread and the bottom thread is a bottom external thread; or the top thread is a top external thread and the bottom thread is a bottom internal thread.

[0015] In the above technical solution, the top thread and bottom thread are coarse threads, and the internal thread and external thread are fine threads.

[0016] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0017] 1. In this invention, the first mating end is connected to the first fastener, and then the second fastener is used to tighten the second mating end again. This can effectively improve the connection strength between the operating handle and the tattoo head, prevent loosening during operation, ensure the stability of operation, improve the safety of use, and also ensure the accuracy of tattooing.

[0018] 2. This invention employs a double-fastening structure, creating multiple layers of resistance. This enhances the tightness between the operating handle and the tattoo head, reducing the likelihood of the tattoo head loosening during operation. Furthermore, the installation process requires multiple tightening operations. If the central axis is not aligned during the previous tightening, resulting in outward tilting or deviation, subsequent tightening will be difficult or result in poor installation. This provides a prompt to the operator, allowing for timely correction of previous tightening deviations and preventing uneven force on the needle components, which could affect the tattooing effect. Moreover, if the initial tightening is insufficient, subsequent tightening operations can compensate for this, effectively improving the connection's strength and stability and reducing the safety hazard of loosening.

[0019] 3. The invention features a double fastening system, which provides better sealing compared to the previous single fastening method, effectively preventing pigment from entering the operating handle and contaminating it.

[0020] 4. In this invention, the second fastener and the second mating end are connected by a screw thread, which is convenient and quick to connect and provides good stability.

[0021] 5. In this invention, the second fastener is threadedly connected to the operating handle, and a limiting ring is provided in the middle of the operating handle to restrict the movement of the second fastener relative to the operating handle, so as to prevent the second fastener from disengaging from the operating handle and ensure the stability of the connection.

[0022] 6. In this invention, the first fastener and the first mating end can be connected by a sealing ring, or by a snap-fit ​​connection between a snap-fit ​​part and a slot, or by a screw connection. The connection methods are diverse and suitable for different interfaces.

[0023] 7. In this invention, the spiral direction of the first tightening is opposite to that of the second tightening. This way, if either set of tightening comes loose, the other set of tightening will have a stronger locking force and a better locking effect. Therefore, the double tightening with opposite directions can further increase the connection strength and tightness between the operating handle and the tattoo head, prevent the two from coming loose, and improve the stability and safety of the operation.

[0024] 8. In this invention, the primary tightening uses a coarse thread, while the secondary tightening uses a fine thread. This means the pitch of the primary tightening thread is greater than that of the secondary tightening thread. The primary tightening thread has lower precision requirements, allowing for rapid positioning during installation and facilitating quick connection between the operating handle and the tattoo head. It also provides a pre-positioning for the secondary tightening, improving the efficiency of subsequent secondary tightening installations. Furthermore, if the primary tightening thread becomes loose, the secondary tightening force is increased to effectively prevent loosening, ensuring connection stability and improving safety during use. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure in Embodiment 1 of the present invention;

[0026] Figure 2 This is a partial structural diagram of the connection between the operating handle and the permanent makeup head in Embodiment 1 of the present invention (with the first tightening completed and the second tightening not completed).

[0027] Figure 3 This is a partial structural diagram of the connection between the operating handle and the permanent makeup head in Embodiment 1 of the present invention (in the state after one tightening and the second tightening is completed);

[0028] Figure 4 yes Figure 1 A magnified view of a portion of the middle limiting ring;

[0029] Figure 5 This is a partial structural diagram of the end of the operating handle in Embodiment 2 of the present invention;

[0030] Figure 6 This is a schematic diagram of the end face structure of the first mating end and the first fastener in Embodiment 2 of the present invention;

[0031] Figure 7 This is a schematic diagram of the end face structure during the connection process between the first mating end and the first fastener in Embodiment 2 of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure of the permanent makeup head in Embodiment 3 of the present invention;

[0033] Figure 9 This is a partial structural diagram of the connection between the operating handle and the permanent makeup head in Embodiment 3 of the present invention (with the first docking end connected to the first fastener and the second docking end not connected to the second fastener).

[0034] Figure 10 This is a partial structural diagram of the connection between the operating handle and the permanent makeup head in Embodiment 3 of the present invention (the first docking end is connected to the first fastener, and the second docking end is connected to the second fastener).

[0035] Figure 11 This is a partial three-dimensional structural diagram of the bottom of the operating handle in Embodiment 3 of the present invention;

[0036] Figure 12 This is a schematic diagram of the structure of the top thread and bottom thread, and the external thread and internal thread during the loosening process of the permanent makeup head in Embodiment 3 of the present invention (the arrow direction is the loosening direction of the permanent makeup head);

[0037] Figure 13 This is a partial structural diagram of the connection between the operating handle and the permanent makeup head in Embodiment 4 of the present invention (with the first docking end and the second docking end connected, and the first docking end and the second docking end connected).

[0038] Figure 14 This is a partial three-dimensional structural diagram of the bottom of the operating handle in Embodiment 4 of the present invention.

[0039] The components are as follows: 1. Operating handle; 2. Embroidery head; 3. First mating end; 4. First fastener; 5. Second mating end; 6. Second fastener; 7. External thread; 8. Internal thread; 9. First external thread; 10. First internal thread; 11. Limiting ring; 12. Annular spacing; 13. Annular groove; 14. Annular protrusion; 15. Needle assembly; 16. Drive assembly; 17. First cavity; 18. Through hole; 19. Elastic sealing ring; 20. Annular mounting groove; 21. Adjusting component; 22. Snap-fit ​​part; 23. Snap-fit ​​groove; 24. Relief notch; 25. Top thread; 26. Bottom thread; 101. Mounting hole; 102. Relief hole; 103. Annular protrusion; 104. Spring. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0041] Example 1: See Figures 1-4 As shown, a permanent makeup device with secondary fastening includes an operating handle 1 and a permanent makeup head 2 connected to the operating handle. The top of the permanent makeup head has a first mating end 3, and the bottom of the operating handle has a first fastener 4, which is detachably connected to the first mating end. A second mating end 5 is provided on the bottom outer surface of the first mating end, and a second fastener 6 is installed on the outside of the operating handle, which is detachably connected to the second mating end. In this embodiment, the first fastener, the second fastener, the first mating end, and the second mating end are coaxially arranged.

[0042] In this embodiment, taking the needle exit direction of the permanent makeup head as the bottom as an example, the operating handle is installed on the top of the permanent makeup head.

[0043] In this embodiment, when the operating handle is connected to the permanent makeup head, the operating handle is first quickly connected to the first mating end of the permanent makeup head via the first fastener. After the connection is completed, it is then connected to the second mating end via the second fastener. During this process, if the central axis of the operating handle and the permanent makeup head does not coincide after the first fastener is connected to the first mating end, resulting in outward tilting or offset, the second fastener will be difficult to install smoothly or even at all. This allows the operator to know that there is a problem with the initial fastening, and they can simply disassemble and reinstall it. This timely correction of the deviation in the initial connection and installation prevents uneven force on the permanent makeup head during use, which could affect the permanent makeup effect. In this embodiment, the operating handle is fastened to the first and second mating ends of the permanent makeup head by the first and second fasteners, respectively, providing double fastening. This increases the fastening effect between the operating handle and the permanent makeup head, preventing the permanent makeup head from loosening during operation and effectively reducing safety hazards. Meanwhile, compared with the previous single-fastening method, this embodiment adopts double fastening. If the first fastening effect is not good, a second fastening is used to further increase the fastening effect and the sealing is better, preventing contamination of the operating handle.

[0044] See Figures 1-3 As shown, the outer surface of the second mating end is provided with an external thread 7, and the bottom inner wall of the second fastener is provided with an internal thread 8. The second fastener is screwed to the external thread of the second mating end via the internal thread.

[0045] The outer diameter of the external thread is smaller than the outer diameter of the tattoo head. When the second fastener is connected to the second mating end, the bottom of the second fastener abuts against the top surface of the tattoo head.

[0046] In this embodiment, the second fastener and the second mating end are connected by threads, thus enabling a fast and convenient secondary tightening connection. The threaded connection also provides good strength and a good sealing effect. Furthermore, in the connected state, the second fastener rests against the top surface of the tattoo head, thus holding the operating handle and the tattoo head together, providing anti-loosening force and preventing any space for loosening, further preventing separation and improving the tightening effect.

[0047] See Figure 1 , 4 As shown, the operating handle has a first external thread 9 on its middle outer wall and a first internal thread 10 on its top inner wall. The second fastener is screwed to the operating handle via the first internal thread.

[0048] In this embodiment, the second fastener is screwed to the outer wall of the operating handle via the first internal thread. When the second fastener is not connected to the second mating end, it spirals upwards along the operating handle. After the first fastener is connected to the first mating end, the second fastener is screwed downwards. During this process, the internal thread at the bottom of the second fastener engages with the external thread of the second mating end, thus achieving the connection between the second fastener and the second mating end. The first external thread and the first internal thread are used to limit the movement of the second fastener by the operating handle, ensuring that after the second fastener and the second mating end are locked together, the second fastener will not move relative to the tattoo head or the operating handle, forming a mutually fixed structure with high stability.

[0049] See Figure 1 , 4 As shown, a limiting ring 11 is provided on the outer wall of the middle part of the operating handle, and an annular gap 12 is provided between the limiting ring and the first external thread. An annular groove 13 is provided on the inner wall of the limiting ring, and the annular groove is set directly opposite to the first external thread. An annular protrusion 14 is provided on the top outer edge surface of the second fastener, and the annular protrusion is movably disposed in the annular groove.

[0050] In this embodiment, the annular protrusion on the top outer edge of the second fastener is located in the annular groove of the limiting ring. Thus, the second fastener is spiraled on the first external thread, so that when the second fastener moves up and down, it is limited by the annular protrusion and the annular groove, preventing the second fastener from disengaging from the first external thread. In other words, the limiting ring limits the second fastener and prevents it from falling off the operating handle.

[0051] Meanwhile, in this embodiment, screw holes can be made on the limiting ring and the operating handle, and the limiting ring can be locked onto the operating handle with bolts. The limiting ring can also be glued onto the operating handle, or other methods can be used. There are various ways to connect the limiting ring and the operating handle, and you can choose according to the actual situation.

[0052] See Figures 1-3 As shown, the tattoo head is provided with an upward-facing self-resetting needle assembly 15, and the operating handle is provided with a driving assembly 16 that drives the needle assembly to extend downward.

[0053] The driving components consist of a motor and a drive shaft. The motor drives the drive shaft to move up and down. When the drive shaft is facing down, it drives the needle assembly to move down. When the drive shaft is facing up, the needle assembly self-resets and moves upward, so that the top of the needle assembly is always in contact with the bottom of the drive shaft. Therefore, the driving components drive the needle assembly to move up and down back and forth, thereby realizing the permanent makeup work.

[0054] See Figures 1-3As shown, the tattoo head has a mounting hole 101 in the middle. The needle assembly is inserted into the mounting hole. A clearance hole 102, larger in diameter than the mounting hole, is located in the middle of the mounting hole. An annular protrusion 103 is located on the outer surface of the needle assembly and is positioned within the clearance hole. A spring 104 is fitted onto the middle of the needle assembly. The bottom of the spring rests against the bottom surface of the clearance hole, and the top rests against the bottom surface of the annular protrusion. The spring pushes the annular protrusion and the needle assembly upwards for self-reset. When a downward force is applied to the needle assembly, the spring is compressed, causing the needle assembly to move downwards. When the downward force is released, the spring automatically returns to its original position, pushing the needle assembly upwards for self-reset.

[0055] See Figures 1-3 As shown, the first fastener has a first cavity 17 in the middle, and the bottom of the drive assembly is disposed in the first cavity; the first mating end has a through hole 18 inside, and the top of the needle-punching assembly passes through the through hole and is inserted into the first cavity and contacts the drive assembly; the bottom of the first fastener is inserted into the through hole, and the top of the first mating end abuts against the bottom surface of the operating handle.

[0056] At least one set of elastic sealing rings 19 is provided between the first fastener and the through hole. At least one set of annular mounting grooves 20 is provided on the bottom outer edge surface of the first fastener. The inner end of each set of elastic sealing rings is installed in one set of annular mounting grooves, and the outer wall of the elastic sealing ring abuts against the inner wall of the through hole. In this embodiment, it is preferable to have more than two sets of elastic sealing rings spaced apart. This is because when installing and positioning with the tattoo head, if only one set of elastic sealing rings is provided, the first fastener and the tattoo head are prone to shaking. Using two or more sets mutually limits each other, ensuring the stability of the connection and use.

[0057] In this embodiment, the first fastener is directly inserted into the first mating end, and a flexible sealing ring is used to secure and seal it, ensuring a tight fit between the first fastener and the first mating end, thus achieving a one-time fastening. In this embodiment, the first fastener and the first mating end are quickly connected using a plug-in tight fit method.

[0058] In this embodiment, when the first fastener is installed with the first mating end, the elastic sealing ring is squeezed and undergoes elastic deformation, which will generate a squeezing force on the tattoo head and increase the friction with the tattoo head, forming an axial resistance opposite to the direction of movement of the needle assembly, thereby restricting the axial movement of the tattoo head and preventing it from separating from the operating handle.

[0059] Meanwhile, in this embodiment, the elastic sealing ring not only serves as a sealing element and an elastic limiting element, but also as an anti-slip element to prevent the tattoo head from moving axially relative to the operating handle, thus playing an axial limiting role.

[0060] In this embodiment, the steps for connecting the operating handle to the permanent makeup head are as follows:

[0061] ① Bring the operating handle and the tattoo head close to each other, align the first fastener with the first mating end, and then insert the first fastener into the first mating end until the top of the first mating end touches the bottom surface of the operating handle, thus completing the fastening connection between the first fastener and the first mating end and achieving a fastening connection in one step.

[0062] In step ①, when the first fastener is inserted into the first mating end, the elastic sealing ring will be squeezed and deformed by the first fastener and the first mating end. In this way, the squeezing deformation force of the elastic sealing ring will first be reduced as much as possible by the first fastener and the first mating end to hold it in place. At the same time, it will limit the axial movement of both and increase the resistance to axial movement, thereby preventing the tattoo head from detaching from the operating handle.

[0063] ② The operator rotates the second fastener downwards in a spiral. The bottom of the second fastener will be screwed into the external thread of the second mating end through the internal thread until the second fastener contacts the top of the tattoo head. The screwing force of the threaded connection will give the operating handle and the tattoo head a pulling force to move closer to each other, making the tattoo head more difficult to separate, thus achieving a secondary fastening connection.

[0064] In this embodiment, the elastic sealing ring provides a first limit to the axial movement of the operating handle and the tattoo head. Then, the screw tension of the second fastener connected to the second mating end provides a second limit to the axial movement of the operating handle and the tattoo head, preventing the tattoo head from loosening during the tattooing process and ensuring the stability and safety of the tattooing.

[0065] In this embodiment, an adjustment member 21 is provided on the top of the operating handle. The adjustment member is equipped with a power supply mechanism to provide power to the drive component. The adjustment member is screwed to the operating handle. When the adjustment member and the operating handle are screwed together and rotated, the adjustment member will pull the drive component up or down, thereby adjusting the extension length of the needle component, that is, adjusting the length of the needle.

[0066] Example 2: See Figures 5-7As shown, a permanent makeup device with secondary fastening has a structure that is basically similar to that of Embodiment 1, except that: the first fastener is connected to the first mating end via a spiral locking structure, two sets of snap-fit ​​parts 22 are symmetrically provided on the bottom outer surface of the first fastener, and two sets of slots 23 are symmetrically provided on the inner wall of the through hole, the snap-fit ​​parts are snap-fitted to the slots, and the snap-fit ​​parts and the slots form the spiral locking structure.

[0067] The outer surface of the snap-fit ​​part is an arc surface that curves from the inside out. Two sets of clearance notches 24 are symmetrically provided on the inner wall of the through hole, each set of clearance notches being positioned between adjacent slots. The slots match the snap-fit ​​parts, with each set of snap-fit ​​parts snapping into one set of slots, and the snap-fit ​​parts and slots fitting tightly together. The clearance notches are used when the first fastener and the second mating end are installed. The snap-fit ​​part first penetrates into the first mating end through the clearance notch, and then the first fastener is rotated, causing the snap-fit ​​part to snap into the slot, achieving a tight fit between the snap-fit ​​part and the slot, providing a locking function and facilitating installation.

[0068] In this embodiment, the locking method between the second fastener and the second pair of stages is the same as in Embodiment 1. The difference from Embodiment 1 is that the locking method between the first fastener and the first mating end is different. This embodiment uses a spiral locking structure.

[0069] In this embodiment, one end of the snap-fit ​​part is located close to the outer surface of the first fastener, and the other end is located away from the outer surface of the first fastener. One end of the slot is connected to the inner wall of the arc-shaped block, and the other end is located away from the inner wall of the arc-shaped block. When the snap-fit ​​part is connected to the slot, the snap-fit ​​part is inserted into the clearance notch and then rotates downward. During this process, the arc surface close to the outer surface of the first fastener gradually rotates into the corresponding slot. When the rotation continues, due to the guidance of the arc surface, the snap-fit ​​part will squeeze the first mating end until the snap-fit ​​part is completely inserted into the slot. The inner wall of the slot is an arc surface that matches the arc surface of the snap-fit ​​part, and the two fit tightly together. The slot clamps the snap-fit ​​part, and at the same time, the slot restricts the rotation of the snap-fit ​​part.

[0070] In this embodiment, the second fastener and the second mating end are connected in the same way, while the first fastener and the first mating end are connected differently. The first fastening will be achieved by the tight fit between the snap-fit ​​part and the slot, which will lock the first fastener and the first mating end together. The slot will be used to limit the circumferential rotation of the snap-fit ​​part, and the tight fit between the two will be used to limit the axial movement between them, preventing the tattoo head from coming loose from the operating handle during use, thus improving the stability and safety of use.

[0071] In this embodiment, assuming that the screw locking direction is clockwise when the first fastener is connected to the first mating end, the screw locking direction of the second fastener to the second mating end is counterclockwise. That is, the locking directions of the first fastener and the second fastener are opposite, thus mutually restricting each other and achieving a better locking effect.

[0072] Example 3: See Figures 8-12 As shown, a permanent makeup device with secondary fastening has a structure that is basically similar to that of Embodiment 1, except that: the top of the first docking end is provided with a top thread 25, the bottom of the first fastener is provided with a bottom thread 26, and the first docking end and the first fastener are screwed together by the top thread and the bottom thread.

[0073] In this embodiment, the primary fastening method is a threaded connection, which is connected by a top thread and a bottom thread. This primary fastening method is different from that in Embodiment 1 and Embodiment 2.

[0074] Furthermore, in this embodiment, the thread direction of the top thread and the bottom thread is opposite to that of the internal thread and the external thread. Assuming the top thread and the bottom thread are left-hand threads, then the internal thread and the external thread are right-hand threads, and vice versa.

[0075] The top and bottom threads are coarse threads, while the internal and external threads are fine threads. Therefore, the pitch of the top and bottom threads will be greater than the pitch of the internal and external threads.

[0076] Coarse threads have a larger helix angle. Due to the larger helix angle and pitch, fewer threads are needed for the same lead distance. Therefore, coarse threads require less precision in installation and are easier to install and remove. However, their vibration resistance is relatively weaker, and their self-locking and sealing properties are relatively poorer, making them more prone to loosening. Fine threads, on the other hand, have a smaller helix angle and pitch, resulting in more threads for the same lead distance. This leads to better sealing properties, weaker vibration resistance, but better self-locking properties, making them less prone to loosening. However, they require higher precision in installation.

[0077] Therefore, in this embodiment, in order to improve the convenience of the initial connection and installation of the operating handle and the tattoo head, and to improve the installation efficiency, the first fastener and the first mating end adopt coarse thread.

[0078] When connecting the operating handle to the permanent makeup head, the first fastener is inserted into the first mating end, quickly aligned via the coarse thread, and then rapidly locked in place, achieving a single tightening. This not only achieves a single tightening, but also, because the second fastener and the second mating end use fine threads, the initial tightening provides guidance and alignment for the secondary fine thread connection. This allows for a direct and quick connection when the second fastener and the second mating end are screwed together (in conventional fine thread connections, multiple screwing attempts may fail to align properly, even leading to thread stripping). Therefore, using coarse threads for the first fastener and the first mating end, and fine threads for the second fastener and the second mating end, ensures connection strength and stability while also improving the smoothness and convenience of installation.

[0079] See Figure 12 As shown in this embodiment, after prolonged, high-frequency vibration, the coarse thread will loosen first, that is, the tattoo head moves downward relative to the operating handle, and the top thread moves downward relative to the bottom thread, resulting in a loosening movement. However, since the coarse thread has a larger helix angle than the fine thread, under the same external force, the coarse thread loosens to a greater extent than the fine thread. Driven by the aforementioned loosening movement, the pitch between the external and internal threads gradually disappears along the loosening direction, and compression occurs, gradually increasing the pressure. This increases the contact area and frictional resistance between the external and internal threads, thereby increasing the tightening force between the second fastener and the second mating end, which improves the tightening performance between the operating handle and the tattoo head. Therefore, in this embodiment, not only are the top thread, bottom thread, internal thread, and external thread spiral directions opposite, which will give a reverse force and increase the fastening effect, but the use of coarse and fine threads further increases the fastening effect. The two restrain each other, effectively preventing the permanent makeup head from loosening, improving the stability, firmness and safety of the permanent makeup process, and preventing the permanent makeup head from falling off and causing safety hazards.

[0080] In this embodiment, the top thread is an internal top thread, and the bottom thread is an external top thread. The internal top thread is provided on the inner wall of the through hole.

[0081] Example 4: See Figure 13 , 14 As shown, a permanent makeup device with secondary fastening has a structure that is basically similar to that of Embodiment 3, except that the top thread is an external thread and the bottom thread is an internal thread.

Claims

1. A tattoo machine with secondary fastening, comprising an operating handle and a tattoo head connected with the operating handle, the top of the tattoo head is provided with a first docking end, the bottom of the operating handle is provided with a first fastener, and the first fastener is detachably connected with the first docking end, characterized in that: The bottom outer surface of the first docking end is provided with a second docking end, and the outer portion of the operating handle is provided with a second fastener which is detachably connected with the second docking end; ​ The tattooing head is provided with a needle assembly which is upward self-resetting, the operating handle is provided with a driving assembly which drives the needle assembly to extend downward, the middle portion of the first fastener is provided with a first cavity, and the bottom of the driving assembly is arranged in the first cavity; the inside of the first docking end is provided with a through hole, the top of the needle assembly is inserted into the first cavity through the through hole, and is in contact with the driving assembly; The middle outer wall of the operating handle is provided with a first outer thread, the top inner wall of the second fastener is provided with a first inner thread, and the second fastener is connected with the operating handle through the first inner thread and the first outer thread. The middle outer wall of the operating handle is provided with a limiting ring, an annular space is arranged between the limiting ring and the first outer thread, the inner wall of the limiting ring is provided with an annular groove which is arranged opposite to the first outer thread, the top outer edge surface of the second fastener is provided with an annular protrusion which is movably arranged in the annular groove.

2. The tattoo machine with secondary fastening according to claim 1, characterized in that: The outer surface of the second docking end is provided with an outer thread, the bottom inner wall of the second fastener is provided with an inner thread, and the second fastener is connected with the second docking end through the inner thread and the outer thread.

3. The tattoo machine with secondary fastening according to claim 1, characterized in that: The inside of the first docking end is provided with a through hole, and the bottom of the first fastener is inserted into the through hole.

4. The tattoo machine with secondary fastening according to claim 3, characterized in that: At least one set of elastic sealing ring members is arranged between the first fastener and the through hole, the bottom outer edge surface of the first fastener is provided with at least one set of annular mounting grooves, the inner end of each set of elastic sealing ring members is mounted in a set of annular mounting grooves, and the outer wall of the elastic sealing ring member abuts against the inner wall of the through hole.

5. The tattoo machine with secondary fastening according to claim 3, characterized in that: The bottom outer surface of the first fastener is symmetrically provided with two sets of clamping portions, and the inner wall of the through hole is symmetrically provided with two sets of clamping grooves, the clamping portions are connected with the clamping grooves in a clamping mode.

6. The tattoo machine with secondary fastening according to claim 2, characterized in that: The top of the first docking end is provided with a top thread, the bottom of the first fastener is provided with a bottom thread, and the first docking end is connected with the first fastener through the top thread and the bottom thread in a screwing mode.

7. The tattoo machine with secondary fastening according to claim 6, characterized in that: The thread direction of the top thread and the bottom thread is opposite to the thread direction of the inner thread and the outer thread.

8. The tattoo machine with secondary fastening according to claim 6, characterized by the fact that: The top thread is a top inner thread, and the bottom thread is a bottom outer thread; or the top thread is a top outer thread, and the bottom thread is a bottom inner thread.

9. The tattoo machine with secondary fastening according to claim 6 or 7, characterized in that: The top thread and the bottom thread are coarse thread, and the inner thread and the outer thread are fine thread.

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