Clamp and pressure maintaining machine

Abstract

The utility model discloses a clamp and a pressure maintaining machine, and relates to the technical field of clamps, the clamp comprises an upper clamping die and a lower clamping die, and the upper clamping die is provided with a first protrusion for a rear shell to be sleeved and fixed; the lower clamping die is provided with a first limiting part, a first limiting groove and a second limiting groove; the first limiting part is arranged on the side wall of the first limiting groove and is used for limiting the rear shell; the second limiting groove is formed in the bottom wall of the first limiting groove and used for containing and limiting the button. The second limiting groove is communicated with the first limiting groove to form a stepped groove; the second limiting groove and the first protrusion are coaxially arranged. When the clamp works, the first protrusion drives the rear shell to move towards the button, the limiting part of the rear shell is matched with the first limiting part, the rear shell is prevented from deviating in the assembling process, and the assembling concentricity is guaranteed. And the rear shell is pressed downwards to be in contact with the button, the pressure excites the double-sided adhesive tape of the PET sheet between the rear shell and the button, the rear shell is bonded with the button, and part assembly is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of assembly equipment, and particularly relates to a fixture and a hydraulic press. Background Art

[0002] In the technical field of fixtures, a core technical requirement is to ensure extremely high concentricity and consistency between components to guarantee product performance and reliability. However, the existing technology faces a key problem: the manual assembly method cannot meet the high-precision concentricity requirements. Especially under the limitation of product structure, such as the assembly of the rear shell and the button in the button structure, the lack of effective structural positioning makes it difficult to guarantee the concentricity and consistency between products after assembly. Summary of the Utility Model

[0003] The main purpose of the utility model is to propose a fixture and a hydraulic press, aiming to improve the concentricity during the product assembly process and solve the problem that it is difficult to guarantee the concentricity consistency of products in the existing manual assembly.

[0004] To achieve the above purpose, the utility model proposes a fixture, which includes:

[0005] An upper clamping die, the upper clamping die has a first protrusion for the rear shell to be sleeved and fixed;

[0006] A lower clamping die, the lower clamping die has a first limiting part, a first limiting groove, and a second limiting groove; the first limiting part is arranged on the side wall of the first limiting groove and is used for limiting the rear shell; the second limiting groove is opened on the bottom wall of the first limiting groove and is used for accommodating and limiting the button; the second limiting groove and the first limiting groove communicate to form a stepped groove; the second limiting groove is coaxially arranged with the first protrusion;

[0007] Wherein, the upper clamping die can move close to the lower clamping die, and drive the first protrusion and the rear shell on the first protrusion to be assembled with the button in the second limiting groove.

[0008] To achieve the above technical purpose, the utility model also proposes a hydraulic press, which includes a pressing plate, a driving member, and the above-mentioned fixture. One end of the driving member is connected to the pressing plate. When the driving member works, the pressing plate is driven to move up and down by it; when the driving member presses down, the rear shell cooperates with the button, and when the driving member pulls up, the rear shell drives the button to move out of the second limiting groove. Description of the Drawings

[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0010] Figure 1 Structural schematic diagram of an embodiment of the press provided by the present invention;

[0011] Figure 2 For Figure 1 Structural schematic diagram of the upper clamping die of the press in

[0012] Figure 3 For Figure 1 Structural schematic diagram of the lower clamping die of the press in

[0013] Figure 4 For Figure 1 Structural schematic diagram of the positioning plate of the press in

[0014] Figure 5 For Figure 1 Structural schematic diagram of the fixture of the press in

[0015] Figure 6 For Figure 1 Top view of the fixture of the press in

[0016] Figure 7 For Figure 6 Cross-sectional view of the fixture A - A in

[0017] Figure 8 For Figure 7 Enlarged view of fixture A in

[0018] Figure 9 For Figure 6 Cross-sectional view of the fixture B - B in

[0019] Explanation of the reference numerals in the drawings:

[0020] 100, Fixture; 1, Upper clamping die; 11, First protrusion; 2, Lower clamping die; 21, First limiting part; 22, Positioning part; 2a, First through hole; 2b, Second through hole; 2c, Third through hole; 2d, First limiting groove; 2d1, First groove section; 2d2, Second groove section; 2e, Second limiting groove; 3, Positioning plate; 31, Fixed part; 4, Elastic member; 5, Positioning magnet; 6, Connecting member; 61, First connecting part; 62, Second connecting part; 7, Support member; 1000, Press; 200, Pressure plate; 300, Driving member; 400, Demounting magnet.

[0021] The realization, functional features, and advantages of the present utility model will be further described in conjunction with embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0025] The prior art faces challenges in achieving high-precision component assembly. During manual assembly, workers align the button with the rear case and press each of the two workpieces tightly with both hands to activate the pet sheet with double-sided adhesive between the button and the rear case, thereby achieving the adhesion of the button and the rear case. It is difficult to ensure the concentricity and consistency of components such as the rear case and the button during this process. The present utility model effectively solves this problem and improves the assembly accuracy and production efficiency by introducing a new type of fixture and a press machine and adopting mechanical positioning and automated assembly.

[0026] The present utility model proposes a fixture.

[0027] In an embodiment of the present utility model, please refer to Figure 1 and Figure 7 and Figure 8The clamp 100 includes an upper clamping mold 1 and a lower clamping mold 2, the upper clamping mold 1 has a first protrusion 11 for the rear shell to be sleeved and fixed; the lower clamping mold 2 has a first limiting portion 21, a first limiting groove 2d, and a second limiting groove 2e; the first limiting portion 21 is arranged on the side wall of the first limiting groove 2d, and is used to limit the rear shell; the second limiting groove 2e is opened on the bottom wall of the first limiting groove 2d, and is used to accommodate and limit the button; the second limiting groove 2e is connected with the first limiting groove 2d to form a stepped groove; the second limiting groove 2e is coaxially arranged with the first protrusion 11; wherein, the upper clamping mold 1 can move close to the lower clamping mold 2, and drive the first protrusion 11 and the rear shell on the first protrusion 11 to assemble with the button in the second limiting groove 2e.

[0028] In this embodiment, the upper clamping die 1 is a die for applying force in the clamp 100 , and is connected to the driving member 300 of the pressure retaining machine 1000 .

[0029] The lower clamping die 2 is a force-bearing die in the fixture 100 . When the driving component 300 of the pressure holding machine 1000 drives the upper clamping die 1 to press downward, when the upper clamping die 1 contacts the lower clamping die 2 , the upper clamping die 1 applies pressure to the lower clamping die 2 .

[0030] Before assembly, the upper clamping die 1 is connected to the driving member 300 of the holding press 1000, and the worker aligns the groove on the outer wall of the rear shell with the first limit portion 21 on the lower clamping die 2, which is a protrusion; at the same time, the side with a deeper groove inside the rear shell is aligned with the side with a higher protrusion of the first protrusion 11, so as to achieve the alignment and insertion of the rear shell and the first protrusion 11. Then, the side of the key with the pet sheet is placed toward the notch direction of the second limit groove 2e.

[0031] During assembly, the pressure holding machine 1000 is driven, and the driving member 300 drives the upper clamping die 1 to press downward, and the first protrusion 11 of the upper clamping die 1 drives the rear shell to move downward. When the rear shell extends into the first limiting groove 2d, the upper clamping die 1 and the lower clamping die 2 limit the movement of the rear shell and the button in the up and down directions, and the first limiting portion 21 cooperates with the groove of the rear shell to limit the movement in other directions, ensuring that the degree of freedom of the two workpieces is 0 when assembled. The upper clamping die 1 drives the rear shell to apply pressure to the button, and at this time, the pressure activates the pet sheet between the button body and the rear shell, and the button and the rear shell are assembled.

[0032] After assembly, the driving member 300 drives the upper clamping mold 1 to move upward, and the rear shell with the first protrusion 11 clamped thereon moves upward at the same time with the glued button, and the worker pulls off the assembly of the rear shell and the button.

[0033] The first limiting portion 21 is inserted into the groove of the rear housing to ensure accurate positioning of the rear housing during assembly. The automated assembly process reduces the reliance on operator skills and reduces errors introduced by human operation.

[0034] See also Figure 7 and Figure 8, To ensure the fixed limit during the assembly of the rear shell and the button, in an embodiment of the present utility model, a protrusion is provided on the outer wall of the rear shell. The first limiting portion 21 is a groove formed on the side wall of the first limiting groove 2d. The groove extends along the depth direction of the first limiting groove 2d and communicates with the notch of the first limiting groove 2d; the groove is used for plugging and matching with the protrusion.

[0035] In this embodiment, before assembly, the worker needs to align the protruding part of the rear shell with the groove of the first limiting portion 21 of the lower clamping die 2 to ensure that the rear shell is correctly placed in the fixture 100.

[0036] The cooperation between the protrusion and the groove provides a mechanical locking mechanism, ensuring the precise positioning of the rear shell during the assembly process, thereby improving the concentricity and assembly accuracy of the entire assembly. This plugging and matching method can stabilize the rear shell during the assembly process, reducing displacement or rotation caused by improper operation or external force, and ensuring the assembly quality.

[0037] Please refer to Figure 3 , In an embodiment of the present utility model, the first limiting groove 2d includes a first groove section 2d1 and a second groove section 2d2 that are spaced apart on the lower clamping die 2; the first groove section 2d1 and the second groove section 2d2 are located above the first limiting groove 2d. The notches of the first groove section 2d1 and the second groove section 2d2 are open and both communicate with the notch of the second limiting groove 2e; steps are formed at the connection between the first groove section 2d1 and the second limiting groove 2e, and at the connection between the second groove section 2d2 and the second limiting groove 2e; the inner peripheral walls of the first groove section 2d1 and the second groove section 2d2 are both arranged in an arc shape;

[0038] In this embodiment, when the first limiting groove 2d limits the rear shell, the inner peripheral walls of the first groove section 2d1 and the second groove section 2d2 are both in contact with the outer wall of the rear shell for limiting.

[0039] The first limiting groove 2d consists of two groove sections, namely the first groove section 2d1 and the second groove section 2d2. These two groove sections are located above the first limiting groove 2d, and their notches are both open to communicate with the notch of the second limiting groove 2e. Steps are designed at the connection between the first groove section 2d1 and the second limiting groove 2e and at the connection between the second groove section 2d2 and the second limiting groove 2e. The stepped structure helps to guide and position the rear shell during the assembly process to ensure that it correctly enters the assembly position. The inner peripheral walls of the first groove section 2d1 and the second groove section 2d2 are both designed in an arc shape. It can smoothly guide the outer wall of the rear shell into the limiting groove, reduce friction during the assembly process, and ensure the tight fit between the outer wall of the rear shell and the inner wall of the limiting groove.

[0040] Before assembly, the worker first places the rear case on the first protrusion 11, places the button in the second limiting groove 2e, and presses down the upper clamping die 1. During assembly, the press 1000 is started, the driving member 300 drives the upper clamping die 1 to press down, the first protrusion 11 pushes the rear case to move downward, the outer wall of the rear case matches the arc-shaped inner peripheral walls of the first groove section 2d1 and the second groove section 2d2, and the outer wall of the rear case slides along the arc-shaped inner peripheral wall until it abuts against the notch of the second limiting groove 2e and adheres to the button.

[0041] During assembly, the inner peripheral wall of the first groove section 2d1 abuts against a section of the rear case with protrusions or grooves for limiting, and the inner peripheral wall of the second groove section 2d2 abuts against a relatively protruding section of the rear case with a cross-section similar to an elliptical shape to achieve limiting. This abutment not only fixes the position of the rear case, preventing it from shifting during assembly, but also ensures the precise alignment of the rear case and the button during assembly.

[0042] Please refer to Figure 3 and Figure 8 In an embodiment of the present utility model, the cross-section of the second limiting groove 2e is circular.

[0043] In this embodiment, the worker aligns the button with the circular opening of the second limiting groove 2e. Due to its adaptation to the shape of the button, precise placement can be easily achieved.

[0044] The button is placed in the second limiting groove 2e, and the circular inner wall smoothly guides the button into the correct position. The circular second limiting groove 2e can accurately position and accommodate the button, ensuring that the button remains in the correct position and orientation during assembly.

[0045] Please refer to Figure 3 In an embodiment of the present utility model, the lower clamping die 2 has a positioning portion 22. The positioning portion 22 is located at the periphery of the notch of the first limiting groove 2d and is used to identify the assembly direction of the button. Before the press 1000 works, the worker aligns the button with the second limiting groove 2e of the lower clamping die 2. At this time, the positioning portion 22 plays an auxiliary positioning role. The convex point inside the button and the positioning portion 22 are on the same straight line, and this straight line passes through the center of a cross-section of the first limiting groove 2d. This cross-section is the plane where the positioning portion 22 and the convex point are located, ensuring that the button can only be placed in the correct direction and position.

[0046] In this embodiment, the design of the positioning portion 22 ensures the consistency of the assembly direction, reducing assembly failures or product defects caused by incorrect directions. By simplifying the assembly operation, the positioning portion 22 helps to improve production efficiency and reduce labor intensity. The use of the positioning portion 22 improves the assembly quality and reliability of the product, reducing the need for subsequent inspections and rework.

[0047] Please refer to Figure 3 and Figure 5and Figure 7 In an embodiment of the present utility model, the fixture 100 further includes a positioning plate 3, a positioning magnet 5 and a connecting member 6. The lower clamping die 2 has a first through hole 2a. The positioning plate 3 has a fixing portion 31. The connecting member 6 has a first connecting portion 61 and a second connecting portion 62. The first connecting portion 61 is located at one end of the connecting member 6, and the longest side of the cross-section of the first connecting portion 61 is greater than the aperture of the first through hole 2a. The second connecting portion 62 is located at the other end of the connecting member 6. The first connecting portion 61 is clamped at one end of the first through hole 2a close to the upper clamping die 1, and the second connecting portion 62 is clamped at the fixing portion 31. The positioning magnet 5 is provided on a surface of the positioning plate 3 away from the lower clamping die 2.

[0048] In this embodiment, the connecting member 6 provides a sliding track for the up and down movement of the lower clamping die 2 and defines the highest point of its upward movement.

[0049] The first connecting portion 61 is located at one end of the connecting member 6, and the longest side of its cross-section is greater than the aperture of the first through hole 2a. Such a design enables the first connecting portion 61 to be clamped at one end of the first through hole 2a close to the upper clamping die 1. The second connecting portion 62 is located at the other end of the connecting member 6 and is used to be clamped with the fixing portion 31 of the positioning plate 3.

[0050] Before assembly, the first connecting portion 61 of the connecting member 6 is inserted into the first through hole 2a of the lower clamping die 2 and clamped in place, while the second connecting portion 62 is clamped with the fixing portion 31 of the positioning plate 3. The above connection ensures the fixation of the lower clamping die 2 and the positioning plate 3.

[0051] The positioning magnet 5 is at an appropriate position on the positioning plate 3 and can adsorb the base of the press 1000 to ensure the correct position of the fixture 100 before assembly.

[0052] The clamping design of the first connecting portion 61 and the second connecting portion 62 provides a simple and effective fixing mechanism, ensuring the stability of the components during the assembly process.

[0053] Please refer to Figure 3 and Figure 7 In an embodiment of the present utility model, the fixture 100 further includes an elastic member 4. The lower clamping die 2 has at least one second through hole 2b. The elastic member 4 is disposed in the second through hole 2b, and one end of the elastic member abuts against a surface of the positioning plate 3 close to the lower clamping die 2. When the rear shell abuts against the first limiting groove 2d, the lower clamping die 2 moves away from the upper clamping die 1, and the elastic member stores elastic potential energy.

[0054] In this embodiment, the elastic member 4 provides power for the lower clamping die 2 to return to its original position after being pressed down and moved downward. The elastic member 4 can directly be a spring, with one end of the spring fixed in the second through hole 2b and the other end abutted against the positioning plate 3; Another preference can be that a lifting column is arranged inside the sleeve. The sleeve is a hollow cylindrical structure, with through holes provided at both ends of the sleeve. The upper through hole is smaller and the lower through hole is larger; A space for the lifting column to slide is left inside the sleeve; One end of it is fixed at the second through hole 2b of the lower clamping die 2, and the other end is clamped with the column body of the lifting column. The lifting column is a stepped column, with the upper column body being thinner and able to pass through the through hole at the upper end of the sleeve, and a spring is wound around the circumference of the thinner column body; The lower column body is thicker and can be clamped with the through hole at the lower end of the sleeve; The lifting column is designed to slide freely inside the sleeve.

[0055] The upper clamping die 1 descends, pushing the rear shell into the first limiting groove 2d, and the lower clamping die 2 moves accordingly. The spring in the lifting column is compressed. After the rear shell and the button are bonded, the upper clamping die 1 ascends, reducing the pushing force on the lower clamping die 2. At this time, the spring in the lifting column releases its elastic potential energy, pushing the lifting column sleeve and the lower clamping die 2 back to their original positions, realizing the reset of the lower clamping die 2.

[0056] Please refer to Figure 3 and Figure 7 , in an embodiment of the present invention, the fixture 100 further includes a support member 7. The lower clamping die 2 has a third through hole 2c, and the third through hole 2c communicates the second limiting groove 2e with the outside, so that the stepped groove and the third through hole 2c penetrate through the lower clamping die 2. One end of the support member 7 is arranged in the third through hole 2c, and the other end of the support member 7 abuts against the positioning plate 3; When the rear shell and the button are assembled, the lower clamping die 2 moves in a direction away from the upper clamping die 1, and the support member 7 supports the button and the rear shell to complete the assembly.

[0057] In this embodiment, one end of the support member 7 is arranged in the third through hole 2c, and the other end abuts against the positioning plate 3. The upper clamping die 1 descends, and the first protrusion 11 pushes the rear shell. The rear shell applies pressure to the lower clamping die 2, and the lower clamping die 2 moves downward; The positioning post remains stationary, providing a reaction force for the button. The support member 7 supports the button through the third through hole 2c, ensuring that the rear shell and the button are in correct contact and bonding.

[0058] Combining the elastic member 4 and the support member 7, the fixture 100 provides better positioning accuracy and stability during the assembly process.

[0059] Please refer to Figure 1 and Figure 8, the present utility model also provides a holding press 1000, which includes a fixture 100. The specific structure of the fixture 100 refers to the above-mentioned embodiments. Since the holding press 1000 adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated one by one here. Among them, it includes the fixture 100, the pressing plate 200 and the driving member 300 of any one of the foregoing specific embodiments. One end of the pressing plate 200 is connected to the driving member 300, and the other end is connected to the upper clamping die 1; the driving member 300 can drive the pressing plate 200 to drive the upper clamping die 1 to move closer to or away from the lower clamping die 2.

[0060] When the driving member 300 presses down, it drives the pressing plate 200 and the upper clamping die 1 to move downward toward the lower clamping die 2, and the first protrusion 11 drives the rear shell to cooperate with the button; when the driving member 300 pulls up, it drives the pressing plate 200 and the upper clamping die 1 away from the lower clamping die 2, and the first protrusion 11 drives the rear shell to drive the button to move out of the second limiting groove 2e.

[0061] In this embodiment, the holding press 1000 mainly includes three parts: a fixture 100, a pressing plate 200 and a driving member 300.

[0062] One end of the pressing plate 200 is connected to the driving member 300. When the driving member 300 works, the pressing plate 200 moves up and down accordingly to apply necessary pressure to the assembly.

[0063] The driving member 300 is responsible for controlling the up and down movement of the pressing plate 200, and its working process includes two stages: pressing down and pulling up:

[0064] Pressing down stage: The driving member 300 presses down, so that the rear shell and the button are fitted and bonded in the second limiting groove 2e.

[0065] Pulling up stage: After the assembly is completed, the driving member 300 pulls up, and the rear shell drives the bonded button to move out of the second limiting groove 2e.

[0066] The holding press 1000 realizes automatic assembly, reduces manual operation, and improves production efficiency. Through the precise positioning of the fixture 100 and the uniform pressure of the pressing plate 200, the consistency and reliability of the assembly quality are ensured.

[0067] Please refer to Figure 1 and Figure 9 , in an embodiment of the present utility model, the holding press 1000 further includes a disassembly magnet 400, and the disassembly magnet 400 is arranged on the side of the upper clamping die 1 away from the lower clamping die 2; when the holding press 1000 works, the disassembly magnet 400 connects the pressing plate 200 and the upper clamping die 1.

[0068] In this embodiment, when the holding press 1000 works, the disassembly magnet 400 is responsible for attracting the pressing plate 200 to connect it with the upper clamping die 1 to form a stable assembly unit.

[0069] After the work is completed, removing the magnet 400 can release the pressure plate 200, facilitating quick disassembly and maintenance.

[0070] The use of the removal magnet 400 simplifies the connection and disassembly process of the pressure plate 200 and the upper clamping die 1, improving production efficiency. The quick connection and disassembly achieved by magnetic force reduce the wear and faults that may be introduced by mechanical connections. The removal magnet 400 provides a non-contact connection method, which helps to keep the components clean and reduces the maintenance requirements.

[0071] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A clamp, characterized in that: The fixture comprises: An upper clamping mold, wherein the upper clamping mold has a first protrusion for the rear shell to be sleeved and fixed; A lower clamping mold, the lower clamping mold has a first limiting portion, a first limiting groove, and a second limiting groove; the first limiting portion is arranged on the side wall of the first limiting groove and is used to limit the rear shell; the second limiting groove is opened on the bottom wall of the first limiting groove and is used to accommodate and limit the button; the second limiting groove is connected with the first limiting groove to form a stepped groove; the second limiting groove is coaxially arranged with the first protrusion; The upper clamping die can move close to the lower clamping die, and drive the first protrusion and the rear shell on the first protrusion to assemble with the button in the second limiting groove.

2. The clamp according to claim 1, characterized in that The outer wall of the rear shell is provided with a protrusion, and the first limiting portion is a groove formed on the side wall of the first limiting groove. The groove is extended along the depth direction of the first limiting groove and is connected to the notch of the first limiting groove; the groove is used to be plugged into and cooperate with the protrusion.

3. The clamp according to claim 2, characterized in that The first limiting groove comprises a first groove section and a second groove section arranged at intervals on the lower clamping die; the first groove section and the second groove section are located above the first limiting groove, the notch of the first groove section and the notch of the second groove section are open and connected with the notch of the second limiting groove; the connecting part of the first groove section and the second limiting groove, and the connecting part of the second groove section and the second limiting groove are both formed with steps; the inner peripheral wall of the first groove section and the inner peripheral wall of the second groove section are both arranged in an arc surface; When the first limiting groove limits the rear shell, the inner peripheral wall of the first groove section and the inner peripheral wall of the second groove section both abut against the outer wall of the rear shell for limiting.

4. The clamp according to claim 1, characterized in that The cross section of the second limiting groove is circular.

5. The clamp according to any one of claims 1 to 4, characterized in that The lower clamping mold has a positioning portion, which is located at the periphery of the notch of the first limiting groove and is used to identify the assembly direction of the button.

6. The clamp according to any one of claims 1 to 4, characterized in that The clamp also includes a positioning plate, a positioning magnet and a connecting piece, the lower clamping mold has a first through hole, the positioning plate has a fixing portion, the connecting piece has a first connecting portion and a second connecting portion, the first connecting portion is located at one end of the connecting piece, and the longest side of the cross section of the first connecting portion is larger than the aperture of the first through hole, the second connecting portion is located at the other end of the connecting piece, the first connecting portion is clamped at one end of the first through hole close to the upper clamping mold, the second connecting portion is clamped at the fixing portion, and the positioning magnet is arranged on a side of the positioning plate away from the lower clamping mold.

7. The clamp according to claim 6, characterized in that The clamp also includes an elastic member, the lower clamping mold has at least one second through hole, the elastic member is arranged in the second through hole, and one end of the elastic member abuts against a surface of the positioning plate close to the lower clamping mold; when the rear shell abuts against the first limiting groove, the lower clamping mold moves in a direction away from the upper clamping mold, and the elastic member stores elastic potential energy.

8. The clamp according to claim 6, characterized in that The clamp also includes a supporting member, and the lower clamping mold has a third through hole, and the third through hole connects the second limiting groove and the outside world, so that the stepped groove and the third through hole pass through the lower clamping mold, one end of the supporting member is arranged at the third through hole, and the other end of the supporting member abuts against the positioning plate; when the rear shell and the button are assembled, the lower clamping mold moves in a direction away from the upper clamping mold, and the supporting member supports the button and the rear shell to complete the assembly.

9. A pressure-maintaining machine, characterized in that: It comprises a pressing plate, a driving member and a clamp as described in any one of claims 1 to 8, wherein one end of the pressing plate is connected to the driving member, and the other end is connected to the upper clamp; the driving member can drive the pressing plate to drive the upper clamp to move closer to or away from the lower clamp.

10. The pressure maintaining machine according to claim 9, characterized in that: The pressure-maintaining machine further comprises a disassembly magnet, which is arranged on a side of the upper clamping die away from the lower clamping die; when the pressure-maintaining machine is working, the disassembly magnet connects the pressing plate and the upper clamping die.

Images