Guiding jig and crimping device

Through the limit groove design of the guide fixture, the problem of crimping of the suction nozzle of the electronic atomization device is solved, and an efficient and low-cost assembly process is achieved to ensure product quality.

CN223236205UActive Publication Date: 2025-08-19SHENZHEN SMISS TECH CO LTD
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Patent Information

Application Number
CN202421718984.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-18
Publication Date
2025-08-19
Estimated Expiration
2034-07-18

AI Technical Summary

Technical Problem

During the assembly process of the electronic atomization device, the suction nozzle is prone to be crimped between the outer tube, resulting in poor product, affecting user experience and increasing production costs.

Method used

The guide fixture is designed, including a front mold and a rear mold. The front mold is provided with a first limiting groove matching the suction nozzle, and the rear mold is provided with a second limiting groove matching the outer tube. The guide is provided through the limiting groove so that the suction nozzle and the outer tube are kept aligned when crimped.

Benefits of technology

Ensure that the suction nozzle is crimped parallel to the outer tube, avoid the occurrence of bad products, save labor costs, and improve product quality and production efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a guide jig and a crimping device, the crimping device comprises a pressure head and the guide jig, the guide jig comprises a front mold and a rear mold, the front mold is provided with a first limiting groove, the first limiting groove is used for accommodating a first to-be-assembled part, and the contour and size of the first limiting groove are matched with the shape and size of the first to-be-assembled part; the rear mold is connected to the front mold and is provided with a second limiting groove which is coaxial with the first limiting groove and is communicated with the first limiting groove, and the outline and the size in the width direction of the second limiting groove are matched with the appearance and the size in the width direction of a second to-be-assembled part, so that the first limiting groove and the second limiting groove can provide guidance during crimping; therefore, the first to-be-assembled part can be connected to the second to-be-assembled part in a pressing mode without being pressed obliquely only by pushing the second to-be-assembled part to move forwards through the pressing head, defective products caused by inclination of the suction nozzle can be prevented from flowing into the market, the first to-be-assembled part does not need to be limited manually, the labor cost is saved, and the production efficiency is improved. And the operation of operators is facilitated.
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Description

Technical Field

[0001] The present application relates to the field of crimping assembly technology, and in particular to a guide fixture and a crimping device. Background Art

[0002] An electronic atomizer, also known as an e-cigarette, heats a liquid atomizing medium and atomizes it into an aerosol for the user to inhale, simulating the sensation of smoking. Currently, most electronic atomizers on the market consist of an outer tube and an atomizer assembly housed within it. The atomizer assembly includes an oil cup, a vent tube, an inner bracket, a PCB mounted on the bracket, a battery, an airflow sensor, and other components. One end of the outer tube is closed, while the other end is open. To assemble the electronic atomizer, the atomizer assembly, which contains the battery and PCB, must first be pressed into the outer tube from one open end. The nozzle is then crimped onto the outer tube to seal the open end, completing the assembly.

[0003] Since the electronic atomizer device is small in size and has a high appearance precision, and the pressing area between the outer tube and the nozzle is small, if the nozzle and the outer tube cannot be well limited, it will not be easy to align the nozzle with the central axis of the appearance, so that the nozzle is easily crooked when it is pressed onto the outer tube, and then the outer tube will have an indentation or the nozzle will be damaged, which will cause the electronic atomizer device to have a defective product. Once the defective electronic atomizer device products enter the market, it will affect the user experience and have a bad impact on the manufacturers of the electronic atomizer device. Utility Model Content

[0004] Based on this, the purpose of this application is to provide a guide jig and a crimping device including the guide jig to solve the technical problem in the prior art that the nozzle of the electronic atomization device is easily deformed when crimping the nozzle and the outer tube, thereby resulting in defective products.

[0005] According to one aspect of the present application, a guide jig is provided for providing guidance when a first component to be assembled and a second component to be assembled are pressed together, the guide jig comprising:

[0006] The front mold is provided with a first limiting groove, the first limiting groove is used to accommodate the first to-be-assembled component, and the contour and size of the first limiting groove match the shape and size of the first to-be-assembled component;

[0007] The rear mold is connected to one side of the front mold, and the rear mold is provided with a second limiting groove that is coaxial with the first limiting groove and interconnected with each other. The contour and size of the second limiting groove along the width direction match the shape and size of the second part to be assembled along the width direction. The width direction extends horizontally and is perpendicular to the axial direction of the second limiting groove.

[0008] In one embodiment, the height of the front mold in the vertical direction is higher than the height of the rear mold in the vertical direction, the first limiting groove is opened on the side of the front mold close to the rear mold, and the second limiting groove is opened on the top wall of the rear mold.

[0009] In one embodiment, the depth of the second limiting groove in the vertical direction is 7 mm to 14 mm.

[0010] In one embodiment, the second limiting groove is connected to an end of the rear mold away from the front mold.

[0011] In one embodiment, a dividing groove is formed on the top wall of the rear mold, and the dividing groove is connected to the second limiting groove and divides the second limiting groove into a first sub-limiting groove and a second sub-limiting groove which are spaced apart along the axial direction of the second limiting groove.

[0012] In one embodiment, a rounded corner is formed between the bottom wall and the side wall of the second limiting groove.

[0013] In one embodiment, a first protrusion is provided on a groove wall of the first limiting groove away from one end of the second limiting groove, and the first protrusion is used to be inserted into the hole of the first to-be-assembled component to position the first to-be-assembled component.

[0014] In one embodiment, the first limiting groove is provided with a second protrusion on the top wall and the bottom wall along the vertical direction, respectively, and the surface of the second protrusion is used to fit with the surface of the first to-be-assembled component.

[0015] In one embodiment, the second protrusion is made of an elastic soft rubber material that can undergo recoverable deformation under the action of an external force.

[0016] According to another aspect of the present application, a crimping device is provided, comprising the guide jig described in any of the above schemes, wherein the pressing head can move relative to the guide jig along the axial direction of the second limiting groove and extend into the second limiting groove.

[0017] The above-mentioned guide jig and crimping device are provided with a front mold and a rear mold on the guide jig, and a first limiting groove that matches the shape and size of the first to-be-assembled part and is coaxial with the second limiting groove is respectively opened in the front mold, and a second limiting groove that matches the shape and width direction size of the second to-be-assembled part is opened in the rear mold, so that when the first to-be-assembled part and the second to-be-assembled part need to be crimped together, the first limiting groove and the second limiting groove can provide guidance, so as long as the pressure head is used to push the second to-be-assembled part forward along the axial direction of the second limiting groove until the first to-be-assembled part abuts against The first limiting groove is away from the groove wall at one end of the second limiting groove, so the first part to be assembled can be accurately crimped onto the second part to be assembled without being distorted. In this way, when the first part to be assembled is the nozzle of the electronic atomization device and the second part to be assembled is the outer tube of the electronic atomization device, it can be ensured that the nozzle is pressed into the outer tube in parallel to ensure the product quality of the electronic atomization device, and avoid defective products caused by the distorted nozzle from entering the market. Moreover, when performing the crimping operation, there is no need to manually limit the first part to be assembled, thereby saving labor costs and facilitating the operation of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the appearance of an electronic atomization device provided in one embodiment of the present application.

[0019] Figure 2 Axial view of the guide fixture provided in one embodiment of the present application Figure 1 .

[0020] Figure 3 This is a schematic diagram of an electronic atomization device provided in one embodiment of the present application being placed on a guide fixture.

[0021] Figure 4 Axial view of the guide fixture provided in one embodiment of the present application Figure 2 .

[0022] Description of reference numerals:

[0023] 10. Guide fixture; 11. Screw hole; 100. Front mold; 101. First limiting groove; 102. First protrusion; 103. Second protrusion; 200. Back mold; 201. Second limiting groove; 201a. First sub-limiting groove; 201b. Second sub-limiting groove; 202. Chamfered corner; 203. Partition groove; 30. Electronic atomization device; 31. Suction nozzle; 31a. Air outlet; 32. Outer tube. DETAILED DESCRIPTION

[0024] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0025] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or part referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0026] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0027] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration; mechanical connections, electrical connections; direct connections, indirect connections through an intermediary, and internal connections between two components or interactions between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0028] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0029] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. If an element is considered to be "connected to" another element, it may be directly connected to the other component or there may be a central component. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0030] One embodiment of the present application provides a guide jig and a crimping device, the crimping device including a guide jig. The crimping device is used to crimp a first component to be assembled and a second component to be assembled together. A positioning jig is used to limit the first and second components to be assembled during the crimping process, preventing them from moving freely during the crimping process, thereby allowing the first component to be crimped to be smoothly crimped into the second component without being distorted.

[0031] The following takes the example that the first part to be assembled and the second part to be assembled are respectively the nozzle and the outer tube of the electronic atomization device, to illustrate the structure of the crimping device and the guide fixture of the crimping device in the present application. This embodiment is only used as an example and does not limit the technical scope of the present application. It can be understood that in other embodiments, the crimping device of the present application is not limited to being used only for crimping the nozzle of the electronic atomization device into the outer tube corresponding thereto, and can also crimp any other part to be assembled with another part to be assembled, and the guide fixture of the present application is not limited to being used only for providing guidance when the nozzle of the electronic atomization device is crimped with the outer tube, and can also be used to provide guidance when any part to be assembled is crimped with another part to be assembled, and this is not limited here.

[0032] See Figure 1 , Figure 1 The electronic atomization device 30 according to one embodiment of the present application is shown in the figure. The electronic atomization device 30 provided by the embodiment of the present application includes a nozzle 31, an outer tube 32, and an atomization component, a battery, and an airflow sensor arranged in the outer tube 32. The crimping device (not shown in the figure) includes Figure 2 The guide jig 10 shown and the pressure head (not shown in the figure) provided at one end of the guide jig 10, the guide jig 10 is used to provide guidance when the suction nozzle 31 and the outer tube 32 are pressed against each other, so that the outer tube 32 can only move along its own axial direction (the X direction shown in the figure) and cannot move in other directions, and the pressure head is used to push the outer tube 32 to move along its own axial direction until the outer tube 32 and the suction nozzle 31 abut against each other and move relative to each other, thereby pressing the suction nozzle 31 and the outer tube 32 against each other.

[0033] Specifically, combined Figure 2 and Figure 3 As shown, the guide fixture 10 includes a front mold 100 and a rear mold 200, wherein the rear mold 200 is connected to one side of the front mold 100, and the front mold 100 is provided with a first limiting groove 101, the first limiting groove 101 is used to accommodate the suction nozzle 31, and the contour and size of the first limiting groove 101 match the shape and size of the suction nozzle 31, and the rear mold 200 is provided with a second limiting groove 201 that is coaxial with the first limiting groove 101 and interconnected with each other, the contour and size of the second limiting groove 201 along the width direction match the shape and size of the outer tube 32 along the width direction (Y direction shown in the figure), and the width direction extends horizontally and is perpendicular to the axial direction of the second limiting groove 201.

[0034] It is not difficult to understand that the purpose of providing the first limiting groove 101 that matches the outer dimensions of the suction nozzle 31 and the second limiting groove 201 that matches the outer shape and width dimensions of the outer tube 32 is to limit the suction nozzle 31 and the outer tube 32 so that they can only move along their own axial direction. When the suction nozzle 31 and the outer tube 32 are crimped together, the suction nozzle 31 and the outer tube 32 can respectively fit with the groove wall of the first limiting groove 101 and the groove wall of the second limiting groove 201, so that the first limiting groove 101 and the second limiting groove 201 can provide guidance.

[0035] When crimping the suction nozzle 31 and the outer tube 32, there are two crimping processes. One crimping process is to first pre-install the suction nozzle 31 on the open end of the outer tube 32, and then put the two together into the second limiting groove 201, and then use the pressure head to push the outer tube 32 and the suction nozzle 31 together along the axial direction of the second limiting groove 201 (i.e., the X direction) toward the first limiting groove 101 until the suction nozzle 31 abuts against the groove wall of the first limiting groove 101 away from the second limiting groove 201, so that the suction nozzle 31 moves relative to the outer tube 32 along its own axial direction and is crimped parallel to the end of the outer tube 32 without being twisted; the other method is to first The suction nozzle 31 is fixed in the first limiting groove 101 so that the suction nozzle 31 cannot move, and then the pressure head is used to push the outer tube 32 forward along the axial direction of the second limiting groove 201 until the outer tube 32 slowly contacts the suction nozzle 31 and is crimped with each other. The suction nozzle 31 can also be crimped parallel to the outer tube 32. The above two crimping processes can ensure the product quality of the electronic atomization device 30, avoid the occurrence of defective products caused by the skewness of the suction nozzle 31 entering the market, and during the crimping operation, there is no need to manually pre-press the suction nozzle 31, thereby reducing the number of work posts, saving labor costs, and facilitating the operation of the operator.

[0036] It is worth noting that in the second crimping process, in order to facilitate the pre-placement of the suction nozzle 31 in the first limiting groove 101, in a preferred embodiment, the front mold 100 and the rear mold 200 are connected as one piece, and the height of the front mold 100 in the vertical direction (Z direction shown in the figure) is higher than the height of the rear mold 200 in the vertical direction. The first limiting groove 101 is opened on the side of the front mold 100 close to the rear mold 200, and the second limiting groove 201 is opened on the top wall of the rear mold 200. In this way, the operator can easily find the first limiting groove 101 and place the suction nozzle 31 directly in the first limiting groove 101.

[0037] Furthermore, in order to better position the outer tube 32 and facilitate the operator to remove the crimped electronic atomization device 30 from the second limiting groove 201, the vertical depth of the second limiting groove 201 is designed to be less than the vertical thickness of the outer tube 32 but greater than half the vertical thickness of the outer tube 32. Generally speaking, the vertical thickness of a commonly used electronic atomization device 30 as shown in the figure is about 14 mm. Therefore, the vertical depth of the second limiting groove 201 is preferably 7 mm to 14 mm. In this way, when the outer tube 32 is placed in the second limiting groove 201, the outer tube 32 is higher than the top wall of the rear mold 200 in the vertical direction, but not too much higher. Therefore, it is not only easier to remove the crimped electronic atomization device 30 from the second limiting groove 201, but also increases the contact area between the tube wall of the outer tube 32 and the groove wall of the second limiting groove 201, thereby better positioning the outer tube 32.

[0038] Furthermore, in order to enable the outer tube 32 to better fit with the groove wall of the second limiting groove 201, a chamfered corner 202 is provided between the bottom wall and the side wall of the second limiting groove 201. This is because the side wall and the bottom wall of the outer tube 32 also have a chamfered corner 202. Therefore, the presence of a rounded corner between the bottom wall and the side wall of the second limiting groove 201 that matches the chamfered corner 202 of the outer tube 32 enables the groove wall of the second limiting groove 201 to completely fit with the tube wall of the outer tube 32, making it even more difficult for the outer tube 32 to move arbitrarily in the second limiting groove 201 but only able to move along its own axial direction, thereby enhancing the limiting and guiding effects.

[0039] Please continue reading Figure 1 , since the first limiting groove 101 is a contoured groove that matches the contour shape of the suction nozzle 31, in order to facilitate the processing of the first limiting groove 101, and after the suction nozzle 31 and the outer tube 32 are crimped, in order to make it easier to remove the electronic atomization device 30 from the second limiting groove 201, as an improvement to the above embodiment, a separation groove 203 is provided on the top wall of the rear mold 200, and the separation groove 203 is connected to the second limiting groove 201 and divides the second limiting groove 201 into a first sub-limiting groove 201a and a second sub-limiting groove 201b arranged along its own axial direction. At the same time, preferably, the separation groove 203 also runs through the opposite sides of the rear mold 200 along the above-mentioned width direction, so that after the crimping is completed, the electronic atomization device 30 can be easily removed by simply inserting a finger into the separation groove 203.

[0040] Furthermore, in order to facilitate the pressure head to extend into the second limiting groove 201 to push the outer tube 32, the second limiting groove 201 is also connected to the end of the rear mold 200 away from the front mold 100, so that the pressure head can be a straight rod structure extending from the end of the rear mold 200 away from the front mold 100 along the axial direction of the second limiting groove 201 into the second limiting groove 201 to push the outer tube 32 to move, thereby simplifying the structure of the pressure head and facilitating the pressure head to apply a crimping force to the outer tube 32 to crimp the suction nozzle 31 and the outer tube 32 to each other.

[0041] See Figure 4In the structure of the first limiting groove 101, the outline size of the first limiting groove 101 matches the outline size of the suction nozzle 31. In the embodiment shown in the figure, the first limiting groove 101 is a structure similar to a flat cone, and its two opposite side walls in the vertical direction and the width direction gradually decrease in the direction from the second limiting groove 201 to the first limiting groove 101, and because the top wall and the bottom wall of the suction nozzle 31 in the thickness direction are arc-shaped, in order to match the suction nozzle 31, the first limiting groove 101 is respectively provided with a second protrusion 103 on the top wall and the bottom wall in the vertical direction. The surface of the second protrusion 103 in this embodiment is also in an arc shape corresponding to the surface of the suction nozzle 31, which is used to fit with the surface of the suction nozzle 31 so as to better limit the suction nozzle 31 in the vertical direction.

[0042] Preferably, the second protrusion 103 is made of an elastic soft rubber material that can undergo recoverable deformation under the action of external force, so that when the suction nozzle 31 is limited in the first limiting groove 101, the second protrusion 103 can generate a force that fits tightly to the suction nozzle 31 under the abutting force of the suction nozzle 31, thereby better fixing the suction nozzle 31, and for suction nozzles 31 of different sizes, because the second protrusion 103 can produce elastic deformation, different suction nozzles 31 can be limited in the first limiting groove 101, so that the guide jig 10 provided in the present application can adapt to suction nozzles 31 of different sizes, so that suction nozzles 31 of different sizes are pressed against the outer tube 32.

[0043] It is worth noting that Figure 1 As shown, the nozzle 31 of the electronic atomization device 30 is usually provided with an air outlet 31a. Therefore, in order to better limit the nozzle 31, in a more preferred embodiment, as shown in FIG. Figure 4 As shown, a first protrusion 102 is provided on the groove wall of the first limiting groove 101 along its own axial direction away from one end of the second limiting groove 201. The first protrusion 102 is used to be inserted into the air outlet 31a of the suction nozzle 31 to better position the suction nozzle 31. Of course, when the first part to be assembled is not the suction nozzle 31, a hole can also be opened on the first part to be assembled, and the first protrusion 102 can be set accordingly according to the position of the hole of the first part to be assembled. There is no special limitation here.

[0044] In addition, a plurality of screw holes 11 are provided on the front mold 100 and the rear mold 200. The screw holes 11 are used for inserting screws so that the guide jig 10 can be fixed on a plane, so that during the crimping operation, the guide jig 10 itself will not move randomly, thereby avoiding affecting the normal progress of the crimping operation.

[0045] It can be seen that the guide jig provided in the present application and the crimping device including the guide jig have all-round positioning of the suction nozzle. Not only does it not require manual pre-pressing of the first part to be assembled, but it also ensures that the central axis of the suction nozzle and the outer tube can be aligned during crimping. Therefore, it can not only significantly reduce the defective products caused by the skewness of the suction nozzle, but also reduce the number of operators and maintenance personnel, which is beneficial to saving the production and manufacturing costs of the electronic atomization device.

[0046] Finally, it should be noted that the various technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A guide fixture, characterized in that: Used to provide guidance when the first to-be-assembled part and the second to-be-assembled part are pressed together, the guide jig includes: The front mold is provided with a first limiting groove, wherein the first limiting groove is used to accommodate the first component to be assembled, and the contour and size of the first limiting groove match the shape and size of the first component to be assembled; The rear mold is connected to one side of the front mold, and the rear mold is provided with a second limiting groove that is coaxial with the first limiting groove and interconnected with each other. The contour and size of the second limiting groove along the width direction match the shape and size of the second part to be assembled along the width direction. The width direction extends horizontally and is perpendicular to the axial direction of the second limiting groove.

2. The guide fixture according to claim 1, characterized in that: The height of the front mold in the vertical direction is higher than that of the rear mold in the vertical direction. The first limiting groove is opened on a side of the front mold close to the rear mold, and the second limiting groove is opened on the top wall of the rear mold.

3. The guide fixture according to claim 2, characterized in that: The depth of the second limiting groove in the vertical direction is 7 mm to 14 mm.

4. The guide fixture according to claim 1, characterized in that: The second limiting groove is communicated with an end of the rear mold away from the front mold.

5. The guide fixture according to claim 1, characterized in that: A dividing groove is formed on the top wall of the rear mold, and the dividing groove is connected to the second limiting groove and divides the second limiting groove into a first sub-limiting groove and a second sub-limiting groove which are spaced apart along the axial direction of the second limiting groove.

6. The guide fixture according to claim 1, characterized in that: A rounded corner is formed between the bottom wall and the side wall of the second limiting groove.

7. The guide fixture according to claim 1, characterized in that: The first limiting groove is provided with a first protrusion on a groove wall away from one end of the second limiting groove. The first protrusion is used to be inserted into the hole of the first to-be-assembled component to position the first to-be-assembled component.

8. The guide fixture according to claim 1, characterized in that: The first limiting groove is provided with a second protrusion on the top wall and the bottom wall along the vertical direction, respectively. The surface of the second protrusion is used to fit with the surface of the first to-be-assembled component.

9. The guide fixture according to claim 8, characterized in that: The second protrusion is made of an elastic soft rubber material that can undergo recoverable deformation under the action of an external force.

10. A crimping device, characterized in that: It comprises a pressing head and a guiding jig as described in any one of claims 1 to 9, wherein the pressing head can move relative to the guiding jig along the axial direction of the second limiting groove and extend into the second limiting groove.