Projection welding movable nut box

Abstract

The utility model relates to the technical field of fixing devices, and discloses a projection welding movable nut box which comprises a nut and a mounting box. The mounting box comprises a main body with a flat plate part and two bent parts; the two bending parts are symmetrical to the flat plate part; the two bent parts respectively extend and bend from two opposite side edges of the flat plate part until the two bent parts are spliced above the top surface of the flat plate part in a meshed manner, and a first through hole is formed in the spliced part; a plurality of convex points are arranged on the bottom surface of the flat plate part; a second through hole coaxial with the first through hole is formed in the flat plate part; the lower portion of the nut is limited between the first through hole and the second through hole, the upper portion of the nut movably penetrates through the first through hole, and the height of the nut meets the requirement that the top face of the nut is located above the first through hole all the time. According to the scheme, the structure is simple, and good performance and reliability can be kept in a high-strength use environment; the device is compact and small, can be flexibly arranged on a complex parent part structure, and is rich in application scene; the projection welding requirement is met, and assembly and installation are convenient; and the repeated assembly guidance quality is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to fixing device technical field, concretely relates to a projection welding movable nut box. BACKGROUND

[0002] In the fixing application of vehicle battery pack, the design of movable nut can significantly improve the convenience and flexibility of installation and maintenance. The traditional fixed nut mode usually needs accurate alignment and complex assembly steps, while the movable nut allows a certain degree of floating adjustment to ensure smooth installation even under slight deviation, meet repeated disassembly, does not affect the size and performance requirements, and can be installed under automatic equipment.

[0003] However, the existing movable nut structure still has some problems: in order to meet the peeling torque requirement after assembly with the base material, the structure design is complex and the manufacturing cost is high; although the design of part of the movable nut considers the continuous stability of the nut fixing, it cannot meet the demand of quick disassembly, which not only needs to increase the gasket and other components, but also needs secondary or even multiple assembly; such structure design, the gasket is easy to stick together in high temperature environment, which also causes insufficient durability, easy to wear or fail, especially in the environment of frequent vibration and large temperature change; multiple assembly makes the efficiency low when repairing and replacing the battery pack, increases the operation difficulty and time cost. CONTENT OF THE UTILITY MODEL

[0004] The utility model intends to provide a projection welding movable nut box to solve the technical problem of unreasonable existing movable nut structure.

[0005] The basic scheme provided by the utility model is: a projection welding movable nut box, comprising: a nut and a mounting box.

[0006] The mounting box comprises a main body with a flat plate part and two curved parts; the two curved parts are symmetrical to the flat plate part; the two curved parts respectively extend and bend from the two opposite sides of the flat plate part, until they are engaged and spliced with the first through hole above the top surface of the flat plate part; the bottom surface of the flat plate part is provided with a plurality of protrusion points for projection welding; the flat plate part is provided with a second through hole coaxial with the first through hole; the lower part of the nut is limited between the first through hole and the second through hole, the upper part of the nut is movably penetrated through the first through hole, and the height of the nut satisfies that the top surface is always above the first through hole.

[0007] The working principle and advantages of the utility model are: the nut is limited and movably assembled in the mounting box; the projection welding movable nut box is projection welded on the corresponding base material of the battery pack fixing position by using the protrusion points; the nut position is adjusted to accurately align the battery pack fixing bolt, and the bolt is penetrated through the nut, the second through hole and the base material to complete the installation.

[0008] Compared with the prior art, the projection welding movable nut box designed in the scheme has the following advantages:

[0009] 1) The structure of the installation box of the scheme fully considers the effective combination of manufacturing process and overall strength. The structure design of the flat plate part, the bending part and the occlusal splicing can be integrally formed by stamping, meeting the batch production requirements and reducing the manufacturing cost. More importantly, through the occlusal splicing mode, the key support for the circumferential limiting of the nut is realized, which can make the peeling torque of the nut after welding and the parent piece be greater than 200 N·m, significantly improve the overall strength, not only ensure that it can still maintain good performance and reliability in a high-strength use environment, but also reduce the use of additional strength components such as conventional rubber rings, simplify the structure, and because the rubber ring is reduced, the nut box has excellent high-temperature resistance, which enriches the application scenarios and can work stably in extreme environments, avoiding performance degradation or failure problems caused by temperature changes.

[0010] 2) The structure of the installation box of the scheme is simplified and the strength-increasing components such as gaskets are reduced. In addition, the flat plate part, the bending part, the spacing between the two through holes and the size of the nut are adaptively designed, which can make the overall size more compact and small, facilitate flexible arrangement on the complex parent piece structure, and greatly improve the convenience and space utilization of installation.

[0011] 3) A plurality of protruding points are designed on the bottom surface of the flat plate part to realize projection welding assembly. This not only improves the welding quality and efficiency, but also optimizes the structural performance and simplifies the manufacturing process. In particular, it can adapt to different parent materials and different complexity of the installation surface structure, and can customize the number and position of the protruding points, providing convenient conditions for subsequent maintenance and upgrading.

[0012] 4) The optimized structure is more simplified in size relationship. The cross-sectional area difference between the upper part of the nut and the first through hole represents the left-right and front-back (X, Z direction) movement amount of the nut. Selecting a reasonable cross-sectional area difference can realize the preset requirement (±3mm) of the movement amount of the center point position of the nut. The movement gap between the lower part of the nut and the first through hole represents the up-down (Y direction) movement amount of the nut. Selecting a reasonable movement gap can realize the preset requirement (±5°) of the inclination amount of the perpendicularity of the nut. This not only speeds up the size design process of the nut box of the scheme, but also quickly responds to the movement demand of the nut core in the X, Y and Z directions in different application scenarios to complete size adjustment, realizing high adaptability and flexibility. This method is particularly important for applications with changing vehicle models, battery packs and installation positions.

[0013] 5) The structure is optimized, the nut adjustment direction is rich, it can be repeatedly assembled, the guidance is strong, it is ensured that each assembly can be accurately in place, the error and wear in the assembly process are effectively reduced, and the service life is prolonged. For the battery swap vehicle, this feature is particularly important because it needs to frequently replace the battery pack, and reliable connecting parts are the key to ensure the safety and performance of the vehicle.

[0014] In summary, the scheme not only improves the performance of the product, but also brings great convenience and economic benefits to the user, and provides a more efficient, reliable and flexible solution for battery pack fixation in electric vehicles and other related fields. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The structure of the projection welding movable nut box provided by the embodiment of the utility model is shown in the figure;

[0016] Figure 2 The front view of the projection welding movable nut box provided by the embodiment of the utility model is shown in the figure;

[0017] Figure 3 The top view of the projection welding movable nut box provided by the embodiment of the utility model is shown in the figure;

[0018] Figure 4 The left view of the projection welding movable nut box provided by the embodiment of the utility model is shown in the figure;

[0019] Figure 5 The top view of the projection welding movable nut box provided by the embodiment of the utility model is shown in the figure;

[0020] The marks in the drawings of the specification include: nut 1, lower part 11, upper part 12, mounting box 2, flat plate part 21, protruding point 211, second through hole 212, curved part 22, first through hole 221, protrusion 222. DETAILED DESCRIPTION

[0021] The following is further described in detail through specific embodiments:

[0022] The embodiment is basically as shown in the accompanying drawings: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 : a projection welding movable nut box, comprising: nut 1 and mounting box 2.

[0023] As shown in Figure 1 and Figure 4 , the nut 1 has a lower part 11 and an upper part 12, the cross-sectional area of the lower part 11 is greater than that of the upper part 12, and the upper part 12 is provided with threads, and the thread specification can be customized according to the assembly relationship.

[0024] The mounting box 2 comprises a main body with a flat plate part 21 and two curved parts 22.

[0025] As shown in Figure 1 and Figure 3 , the two curved parts 22 are symmetrical to the flat plate part 21; the two curved parts 22 respectively extend and bend from the two opposite sides of the flat plate part 21, and are engaged and spliced open with the first through hole 221 above the top surface of the flat plate part 21.

[0026] In this embodiment, the flat plate part 21 is rectangular, and the two curved parts 22 respectively extend from the two opposite long sides of the flat plate part 21. The two curved parts 22 are integrally formed with the flat plate part 21 before being punched and bent, and are punched and formed, which can improve the precision and consistency of the mounting box 2, reduce the assembly process, enhance the structural strength, and at the same time reduce the production cost and material waste, improve the production efficiency. The bending angle of the curved part 22 is 90 degrees. This design enhances the structural rigidity and stability, provides a flat butt joint surface for projection welding, ensures the welding strength and precision, improves the overall assembly quality, and at the same time ensures the butt joint precision and stability, increases the risk of stress concentration, reduces the structural strength, and may cause deformation or failure problems during long-term use.

[0027] As shown in Figure 3 , the two curved parts 22 are engaged and spliced, and the corresponding position of one curved part 22 has at least one protrusion 222, and the corresponding position of the other curved part 22 has at least one groove matched with the protrusion 222, and the engagement and splicing are realized by using the protrusion 222 and the groove. In this embodiment, one protrusion 222 and one groove are arranged in the middle of the splicing contact surface. When the nut is subjected to torsion during assembly, the engagement and splicing mode designed reasonably plays a key role in limiting the circumference of the nut, and the peel torque of the nut and the female part after welding is greater than 200 N·m, which significantly improves the overall strength, not only ensures that it can still maintain good performance and reliability in a high-strength use environment, but also reduces the use of rubber rings, so that the nut box has excellent high-temperature resistance, and the application scenarios are enriched. It can also work stably in extreme environments, avoiding performance degradation or failure problems caused by temperature changes. The contact surface of the protrusion 222 and the groove can be provided with anti-slip texture to improve the engagement and splicing strength, improve the overall stress strength of the mounting box 2, and maintain long-term installation stability and firmness.

[0028] As shown in Figure 5 , the flat plate part 21 is provided with a second through hole 212 coaxial with the first through hole 221, which is used for bolt assembly when the loose nut and the female material are connected.

[0029] The complete loose nut box is assembled, and the nut 1 is limited to move in the mounting box 2. As shown in Figure 4As shown, the lower part 11 of the nut is limited between the first through hole 221 and the second through hole 212, the upper part 12 of the nut is movably penetrated through the first through hole 221, and the height of the nut 1 satisfies that the top surface thereof is always above the first through hole 221. As shown in the figure, Figure 4 The arrow direction is the height direction of the nut, which also represents the Y direction. The cross-sectional area of the lower part 11 of the nut is greater than that of the second through hole 212, the cross-sectional area of the second through hole 212 is greater than that of the first through hole 221, and the cross-sectional area of the first through hole 221 is greater than that of the upper part 12 of the nut, which satisfies the above-mentioned nut assembly requirements.

[0030] The gap between the upper part 12 of the nut and the first through hole 221, i.e. the cross-sectional area difference, represents the left-right and front-back (X, Z direction) movement amount of the nut, and the cross-sectional area difference needs to satisfy the preset requirement of the center point position degree of the nut, such as selecting a reasonable cross-sectional area difference to realize the movement amount of ±3mm of the center point position degree of the nut. The diameter of the first through hole 221 is greater than the diameter of the nut by 1mm, and is customized according to the preset requirement of the movement amount, such as the movement amount of ±3mm, then the diameter of the first through hole 221 is the diameter of the nut +1mm+6mm; the diameter of the second through hole 212 is greater than the diameter of the nut by 2mm, and is customized according to the preset requirement of the movement amount, such as the movement amount of ±3mm, then the diameter of the second through hole 212 is the diameter of the nut +2mm+6mm. The movable gap between the lower part 11 of the nut and the first through hole 221 represents the up-down (Y direction) movement amount of the nut, and the gap needs to satisfy the preset requirement of the perpendicularity of the nut, and the movable gap can be determined by the movable distance between the top surface of the lower part 11 of the nut and the bottom surface of the first through hole 221 along the height direction of the nut, such as Figure 4 The dashed line is the nut after movement adjustment, and a reasonable vertical distance can realize the perpendicularity of the nut ±5° Figure 4 The dashed line is the nut after movement adjustment, and a reasonable vertical distance can realize the perpendicularity of the nut ±5°

[0031] As shown, Figure 4 As shown, the bottom surface of the flat plate part 21 is provided with a plurality of convex points 211 for projection welding, and the projection direction is away from the curved part 22. In this embodiment, as shown, Figure 5As shown, there are 4 protruding points 211 symmetrically arranged at the four corners of the bottom surface of the flat plate part 21. When the nut box of the present scheme is projection welded on the base material, the stress is uniformly distributed, the welding quality is improved, the rapid positioning and flat placement are facilitated, the time and difficulty of manual alignment are reduced, the assembly process is simplified, and the work efficiency is improved; the welding points formed by multiple protruding points can effectively fix the whole flat plate part on the frame base material, and the rigidity and stability of the overall structure are enhanced, especially in the case of bearing vibration and impact load. The performance is particularly prominent. For complex frame structures, multiple protruding points can be flexibly arranged as needed to adapt to different positions and angles, ensuring the optimal selection of welding points and meeting specific functional requirements. If the welding position or number needs to be modified, only the design of the protruding points needs to be adjusted, without changing the entire welding process, which is highly flexible.

[0032] As shown in Figure 5 The length L of the flat plate part 21 can be 40-50mm; the overall width W of the two curved parts 22 perpendicular to the length direction of the flat plate part 21 can be 35-40mm; the difference between the overall length and width of the mounting box 2 is 0-20mm, and the overall mounting box 2 can be 40*40mm, 35*50mm, etc. Such size is more conducive to arrangement on the base structure. Reasonably design the thickness of the flat plate part 21 and the curved part 22, which can be 2-3mm, DC51 or conventional material, which can ensure the strength requirement in the application environment under the cooperation design of the structure and other sizes.

[0033] The processing technology and assembly process of the movable nut box of the present scheme can be: the two curved parts 22 are integrally formed with the flat plate part 21 before stamping and bending, which can be a cross-shaped plate, and the two ends of the to-be-bent part are provided with half-holes and corresponding structures for engaging and splicing in advance; the nut 1 is placed at a suitable position in the middle of the cross-shaped plate, and the upper part 12 of the nut is away from the plate; through stamping technology, the bending and engaging and splicing of the to-be-bent part are realized, the first through hole 221 formed by the splicing of the two half-holes circumferentially surrounds the upper part 12 of the nut, the nut 1 is movably assembled in the mounting box 2, the lower part 11 of the nut is limited between the first through hole 221 and the second through hole 212, the upper part 11 of the nut passes through the first through hole 221, and the top surface of the nut 1 is located above the first through hole 221.

[0034] When the movable nut box of the present scheme is used, the protruding points 211 on the bottom surface of the flat plate part 21 are projection welded with the base part, and the peel torque after welding with the base part is >200N·m; the X, Y and Z direction positions of the nut 1 are adjusted, such as the inclination of the nut 1 verticality ±5°, the center point position of the nut 1 ±3mm, so as to accurately align the battery pack fixing bolt, and the bolt passes through the nut 1, the second through hole 212 and the base material to complete the installation.

[0035] The convex welding movable nut box provided by the embodiment has optimized installation box structure and nut assembly mode, significantly improves overall strength, ensures that excellent performance and reliability can be maintained in high-strength use environment, and the optimized structure not only enhances mechanical strength, but also makes the overall size more compact and reasonable, facilitates flexible arrangement on a complex female structure, greatly improves installation convenience and space utilization rate, and is especially worth mentioning that, since a rubber ring is not used, the nut box has excellent high-temperature resistance, enriches application scenarios, can stably work in extreme environment, avoids performance decline or failure caused by temperature change, the flexible convex point is designed on the flat plate, the convex welding technology is adapted, efficient production is realized in the manufacturing process, and manufacturing cost is greatly reduced, repeated assembly is considered in the design, has strong directivity, ensures that each assembly can be accurately positioned, effectively reduces errors and wear in the assembly process, prolongs service life, and is especially suitable for battery swap vehicles.

[0036] The above is only an embodiment of the utility model, and common knowledge such as specific structures and properties in the scheme is not described in detail, the ordinary skilled in the art knows all ordinary technical knowledge in the technical field of the utility model before the application date or the priority date, can know all prior art in the field and has the ability to apply conventional experimental means before the date, and the ordinary skilled in the art can improve and implement the scheme in combination with self ability under the inspiration given by the present application, and some typical known structures or known methods should not be an obstacle for the ordinary skilled in the art to implement the present application. It should be pointed out that, for the person skilled in the art, without departing from the structure of the utility model, a number of modifications and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect and practicality of the utility model.

Claims

1. A projection welding activity nut box, characterized by, The mounting box and the nut are included. The mounting box includes a main body with a flat plate and two curved sections. The two curved sections are symmetrical to the flat plate. The two curved sections respectively extend from the two opposite sides of the flat plate and are bent until they are engaged and spliced above the top surface of the flat plate and open a first through hole.

2. A projection welded activity nut box according to claim 1, characterized in that The bottom surface of the flat plate is provided with a plurality of raised points for projection welding.

3. A projection welded activity nut box according to claim 1, wherein A second through hole coaxial with the first through hole is opened on the flat plate.

4. A projection welded activity nut box according to claim 3, wherein The lower part of the nut is limited between the first through hole and the second through hole, the upper part of the nut is movably penetrated through the first through hole, and the height of the nut satisfies that the top surface is always above the first through hole.

5. A projection welded activity nut box according to claim 3, wherein At the engaged and spliced position of the two curved sections, at least one protrusion is provided at the corresponding position of one curved section, and at least one groove adapted to the protrusion is provided at the corresponding position of the other curved section.

6. A projection welded activity nut box according to claim 1, wherein The flat plate is rectangular.

7. A projection welded activity nut box according to claim 1, wherein The two curved sections respectively extend from the two opposite long sides of the flat plate.

8. A projection welded activity nut box according to claim 1, wherein The raised points are four, symmetrically arranged at the four corners of the bottom surface of the flat plate, and the raised direction is away from the curved section.

9. A projection welded activity nut box according to claim 8, wherein The two curved sections are integrally formed with the flat plate before being punched and bent.

10. A projection welded activity nut box according to claim 1, wherein The bending angle of the curved section is 90 degrees. The cross-sectional area of the lower part of the nut is larger than that of the second through hole, the cross-sectional area of the second through hole is larger than that of the first through hole, and the cross-sectional area of the first through hole is larger than that of the upper part of the nut. The cross-sectional area difference between the upper part of the nut and the first through hole satisfies the preset requirement of the position degree of the center point of the nut, and the activity amount; the activity gap between the lower part of the nut and the first through hole satisfies the preset requirement of the perpendicularity of the nut, and the inclination amount. The difference between the length and the width of the mounting box is 0-20mm.

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