Welding fixture based on electric vehicle frame assembly

Abstract

The application discloses a welding tool based on an electric vehicle frame assembly and belongs to the field of workpiece welding positioning. In order to solve the problems of misplacement or concentricity deviation of the frame connection, and the influence of the gap between pipe ends on welding quality due to tolerance or uneven clamping, the application comprises a base, a plurality of telescopic assemblies are fixedly installed on the top surface of the base, a pressing assembly is fixedly installed at the telescopic end of each telescopic assembly, a clamping assembly is arranged on each pressing assembly, a displacement assembly is slidingly installed in the inner cavity of the clamping assembly, and a compensation assembly is fixedly installed on the side wall of the electric vehicle frame facing the displacement assembly. The application can actively correct misplacement and concentricity through the clamping assembly, align before welding, eliminate the gap by using displacement and compensation, prevent false welding, and adopt the mode of coexistence of rigidity and flexibility for collaborative clamping, prevent stress concentration, reduce the deformation amount of the frame, and improve the consistency of products.

Description

Technical Field

[0001] This invention relates to the field of workpiece welding positioning technology, and more specifically, to welding fixtures based on electric vehicle frame assemblies. Background Technology

[0002] Electric vehicle frame assemblies are typically made up of multiple irregularly shaped tubular components connected by welding. In mass production, specialized welding fixtures are widely used to position and clamp various parts of the frame to ensure positional accuracy during the welding process. Existing fixtures mostly use rigid clamping components to rigidly fix the frame tubular components and cooperate with manual or robotic arms to complete the welding operation.

[0003] The existing welding fixtures have the following technical problems in actual use: At the frame connection, the pipe wall misalignment or concentricity deviation often occurs during the docking due to the deviation of the end cut angle of the pipe or the cumulative error of the previous assembly. The traditional rigid clamping method can only fix the pipe body and cannot actively correct the relative position of the joint before welding, resulting in insufficient joint strength or out-of-tolerance shape after welding. Even if the pipes are aligned, there may still be local gaps at the connection due to the machining tolerance of the pipe end face or uneven clamping force. During welding, the molten pool is not filled sufficiently, which can easily produce defects such as false welding and incomplete penetration, affecting the weld sealing performance and fatigue life.

[0004] To address the above issues, a welding fixture based on the electric vehicle frame assembly is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a welding fixture based on an electric vehicle frame assembly. By using this invention, the problems of misalignment or concentricity deviation at the frame connection and uneven tube end gap due to tolerance or clamping, which affect the welding quality, are solved in the background.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a welding fixture based on an electric vehicle frame assembly, comprising a base, on the top surface of which mounting bracket one and mounting bracket two are fixedly mounted respectively. Mounting bracket one and mounting bracket two are respectively provided with a plurality of clamping members for clamping the electric vehicle frame. A plurality of telescopic components are fixedly mounted on the top surface of the base. Each telescopic component has a pressing component fixedly mounted at its telescopic end. Each pressing component is provided with a clamping component for correcting misalignment at the connection point of the electric vehicle frame. The telescopic components use the pressing components to press the clamping component against the wall of the electric vehicle frame tube, thereby correcting the connection point of the electric vehicle frame. A displacement component for eliminating gaps in the connection of the electric vehicle frame is slidably mounted in the inner cavity of the clamping component. A compensation component is fixedly mounted on the side wall of the displacement component facing the electric vehicle frame to compensate for the tolerance gap between the displacement component and the wall of the electric vehicle frame tube.

[0007] Furthermore, the clamping member is configured as a rigid clamping assembly; The rigid clamping assembly includes a mounting base 1 fixedly installed on the top surface of the base. A telescopic cylinder 1 is fixedly installed on the side wall of the vertical section of the mounting base 1 facing the electric vehicle frame. A rigid clamping plate 1 is fixedly installed on the side wall of the telescopic end of the telescopic cylinder 1. A rigid clamping plate 2 is fixedly installed on the top surface of the horizontal section of the mounting base 1. The rigid clamping plate 1 and the rigid clamping plate 2 are symmetrically arranged about the electric vehicle frame. Several limiting rods 1 are fixedly installed on the side wall of the rigid clamping plate 1 facing the telescopic cylinder 1. One end of the limiting rod 1 is slidably installed inside the telescopic cylinder 1.

[0008] Furthermore, the telescopic assembly includes a mounting base two fixedly installed on the top surface of the base, and a telescopic cylinder two fixedly installed on the side wall of the mounting base two facing the electric vehicle frame. Several limiting rods two are slidably installed inside the telescopic cylinder two.

[0009] Furthermore, each of the aforementioned clamping components includes a housing. A fixing block 1 is fixedly installed on the side wall of one of the housings. A positioning hole is provided on the side wall of fixing block 1 facing the electric vehicle frame. An annular pressure sensor is embedded and fixedly installed on the side wall of fixing block 1 facing the electric vehicle frame, and the positioning hole is spatially located in the inner circle of the annular pressure sensor. A fixing block 2 is fixedly installed on the side wall of the other housing diagonally opposite. A positioning rod is fixedly installed on the side wall of fixing block 2 facing the electric vehicle frame. The positioning rod and the positioning hole are concentrically arranged.

[0010] Furthermore, a pair of sliding grooves are symmetrically provided inside the outer shell, and an installation groove is also provided inside the outer shell. The two sliding grooves and the installation groove are connected in a continuous manner, and the outer shell is fixedly connected to one end of the limiting rod 2. The displacement assembly includes an arc-shaped plate that is slidably installed inside two slide grooves. The sidewalls of the arc-shaped plate are elastically connected to the sidewalls of the slide grooves by a pair of springs. A pair of inclined guide plates are symmetrically fixed on the arc-shaped outer wall of one side of the arc-shaped plate.

[0011] Furthermore, an elastic pad is fixedly installed on the arc-shaped outer wall on the other side of the arc-shaped plate.

[0012] Furthermore, the pressing assembly includes a pair of push rods that are slidably mounted on the side wall of the outer casing. The two push rods are fixedly connected to the telescopic cylinder 2 via a connecting block. The connecting block is elastically connected to the side wall of the outer casing via a pair of springs 2. The two push rods are correspondingly arranged in the inner rings of the two springs 2. A U-shaped frame is fixedly mounted on the end of each push rod near the inclined guide plate. A roller is rotatably mounted on each U-shaped frame, and each roller is correspondingly rolled on the surface of the inclined guide plate.

[0013] Furthermore, several sealing gaskets are fixedly installed on the side wall of the elastic pad facing the electric vehicle frame; The housing is equipped with a negative pressure assembly; the negative pressure assembly includes several piston rods that are slidably mounted on the arc plate and the elastic pad. Each piston rod has a piston fixedly mounted at the end near the sealing gasket, and the end of each piston rod away from the sealing gasket is elastically connected to the side wall of the inner cavity of the housing through a spring.

[0014] Furthermore, the inner cavity of the outer shell is provided with a guide assembly, which includes a crossbar fixedly installed on the side wall of the inner cavity of the outer shell. Several protrusions are fixedly installed on the side wall of the crossbar facing the spring three. Each piston rod is provided with a relief groove, and the crossbar passes through the relief groove.

[0015] Furthermore, the clamping member is configured as a flexible clamping assembly; The flexible clamping assembly includes a mounting base three fixedly installed on the top surface of the base. A telescopic cylinder three is fixedly installed on the side wall of the vertical section of the mounting base three facing the electric vehicle frame. A flexible clamping plate one is fixedly installed on the side wall of the telescopic end of the telescopic cylinder three. A flexible clamping plate two is fixedly installed on the top surface of the horizontal section of the mounting base three. The flexible clamping plate one and the flexible clamping plate two are symmetrically arranged about the electric vehicle frame. Several limiting rods three are fixedly installed on the side wall of the flexible clamping plate one facing the telescopic cylinder three. One end of the limiting rod three is slidably installed inside the telescopic cylinder three. Several hollow sleeves are fixedly arranged in an array on the side walls of the inner cavities of the first and second flexible clamping plates. Several electromagnets are also fixedly arranged in an array on the side walls of the inner cavities of the first and second flexible clamping plates, and the electromagnets are correspondingly arranged inside the hollow sleeves. Several push rods are slidably arranged through the side walls of the first and second flexible clamping plates, and each push rod is slidably installed in the inner cavity of the hollow sleeve. A permanent magnet is fixedly installed on the side wall of each push rod facing the electromagnet, and the permanent magnet is aligned with the electromagnet. The push rods are elastically connected to the side walls of the inner cavities of the first and second flexible clamping plates by springs four.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By setting up opposing symmetrically distributed clamping components, the present invention can synchronously clamp different parts of the electric vehicle frame connection under the drive of the telescopic components. This can actively correct the pipe wall misalignment and concentricity shift caused by pipe processing errors or cumulative deviations in previous assembly, ensuring that the joint to be welded is in a precise alignment state before welding, and significantly improving the welding quality of the joint. (2) By combining the displacement component and the compensation component, the present invention can simultaneously eliminate the butt gap caused by machining tolerance or uneven clamping at the pipe end face of the connection during the clamping and correction process, effectively avoiding defects such as false welding and incomplete penetration, and improving the sealing performance and fatigue life of the weld. (3) The present invention uses the coordinated arrangement of rigid clamping components and flexible clamping components to ensure that the frame does not drift during the welding process by using rigid clamping, and to provide local floating compensation capability by using flexible clamping, avoiding internal stress concentration caused by multi-point locking. After welding, the stress is released evenly, the frame deformation is small, and the dimensional consistency is better. (4) By using the positioning hole and the ring pressure sensor, the present invention can achieve automatic guidance and correction during the merging process of the clamping components, and will promptly alarm when the deviation exceeds the error range. This ensures the clamping concentricity during long-term use and makes it easy for operators to detect equipment deviations and repair them in time, thus preventing batch quality accidents. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Enlarged view of point A; Figure 3 This is a schematic diagram showing the installation position of the rigid clamping assembly of the present invention; Figure 4 This is a three-dimensional structural diagram of the telescopic component of the present invention; Figure 5 This is a three-dimensional structural diagram of the clamping component of the present invention; Figure 6 for Figure 5 Enlarged view of point B; Figure 7 This is a schematic diagram showing the installation position of the positioning rod of the present invention; Figure 8 This is a cross-sectional schematic diagram of the clamping component of the present invention; Figure 9 This is a schematic diagram showing the installation position of the compensation component of the present invention; Figure 10 This is a three-dimensional structural diagram of the clamping member of the present invention configured as a rigid clamping assembly; Figure 11 This is a three-dimensional structural diagram of the clamping member of the present invention configured as a flexible clamping assembly; Figure 12 This is a cross-sectional schematic diagram of the flexible clamping assembly of the present invention; Figure 13 for Figure 12 Enlarged view of point C.

[0018] In the diagram: 1. Base; 2. Mounting bracket one; 3. Mounting bracket two; 4. Telescopic assembly; 41. Mounting base two; 42. Telescopic cylinder two; 43. Limiting rod two; 5. Clamping assembly; 51. Housing; 52. Fixing block one; 53. Annular pressure sensor; 54. Fixing block two; 55. Positioning rod; 56. Slide groove; 57. Mounting groove; 58. Positioning hole; 6. Displacement assembly; 61. Arc plate; 62. Inclined guide plate; 63. Spring one; 7. Compensation assembly; 71. Elastic pad; 72. Sealing gasket; 8. Negative pressure assembly; 81. Piston rod; 82. Relief groove; 83. Spring three; 9. Guide assembly; 91. Horizontal... 92. Rod; 10. Protrusion; 10. Pressing assembly; 101. Top rod; 102. Connecting block; 103. Spring II; 104. U-shaped frame; 105. Roller; 20. Rigid clamping assembly; 201. Mounting base I; 202. Telescopic cylinder I; 203. Rigid clamping plate I; 204. Rigid clamping plate II; 205. Limiting rod I; 30. Flexible clamping assembly; 301. Mounting base III; 302. Telescopic cylinder III; 303. Flexible clamping plate I; 304. Flexible clamping plate II; 305. Limiting rod III; 306. Hollow sleeve; 307. Push rod; 308. Spring IV; 309. Electromagnet; 310. Permanent magnet. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1 and Figure 2 As shown, the welding fixture based on the electric vehicle frame assembly includes a base 1. Mounting bracket 1 2 and mounting bracket 2 3 are fixedly installed on the top surface of the base 1. Mounting bracket 1 2 and mounting bracket 2 3 are respectively provided with a number of clamping parts, which are used to clamp the electric vehicle frame.

[0021] To address the technical problem of misalignment at the joints during the welding process of electric vehicle frames, the following preferred technical solutions are provided: Several telescopic components 4 are fixedly installed on the top surface of the base 1. Each telescopic component 4 has a pressing component 10 fixedly installed at its telescopic end. Each pressing component 10 is equipped with a clamping component 5 for correcting misalignment at the connection of the electric vehicle frame. The telescopic component 4 uses the pressing component 10 to press the clamping component 5 against the wall of the electric vehicle frame tube, thereby correcting the connection of the electric vehicle frame. Figure 8As shown, a displacement component 6 for eliminating the connection gap of the electric vehicle frame is slidably installed in the inner cavity of the clamping component 5. A compensation component 7 is fixedly installed on the side wall of the displacement component 6 facing the electric vehicle frame to compensate for the tolerance gap between the displacement component 6 and the tube wall of the electric vehicle frame.

[0022] like Figure 5 As shown, each group consists of four telescopic components 4, namely, the corresponding pressing component 10, clamping component 5, displacement component 6, and compensation component 7, which should also be in groups of four. During the welding process of the electric vehicle frame, several clamping components clamp and position various parts of the electric vehicle frame. After clamping, the controller synchronously starts the extension of the four telescopic components 4. That is, the four telescopic components 4 synchronously use the pressing component 10 to drive the four clamping components 5 to saturate and clamp the tube wall of the electric vehicle frame. The two opposing and symmetrical clamping components 5 can form a perfect circle after merging, saturating the tube wall of the electric vehicle frame. During this process, the compensation component 7 can be used to compensate for the tolerance gap between the displacement component 6 and the tube wall of the electric vehicle frame, so that the displacement component 6 has good clamping and clamping of the electric vehicle frame. Effect: Each pair of opposing symmetrical clamping components 5 can form a perfect circle after merging, and these two perfect circles are concentric. Therefore, when two pairs of opposing symmetrical clamping components 5 simultaneously clamp different parts of the electric vehicle frame connection, the position of the connection of the electric vehicle frame can be corrected to ensure that the connection of the two parts of the electric vehicle frame is aligned. When the controller determines that the telescopic component 4 has reached the preset extension position, it means that the correction has been completed. At this time, the connection can be welded from the gap between the two adjacent clamping components 5 by the robotic arm. Through this operation method, the connection can be corrected to ensure good welding quality. The controller is common knowledge in the prior art and is not the direction of improvement of this application, therefore, it is not shown in the figure.

[0023] like Figure 1 and Figure 3 As shown, the clamping element is configured as a rigid clamping assembly 20; as Figure 10 As shown, the rigid clamping assembly 20 includes a mounting base 201 fixedly mounted on the top surface of the base 1. A telescopic cylinder 202 is fixedly mounted on the side wall of the vertical section of the mounting base 201 facing the electric vehicle frame. A rigid clamping plate 203 is fixedly mounted on the side wall of the telescopic end of the telescopic cylinder 202. A rigid clamping plate 204 is fixedly mounted on the top surface of the horizontal section of the mounting base 201. The rigid clamping plates 203 and 204 are symmetrically arranged about the electric vehicle frame. Several limiting rods 205 are fixedly mounted on the side wall of the rigid clamping plate 203 facing the telescopic cylinder 202. One end of the limiting rod 205 is slidably mounted inside the telescopic cylinder 202. Before welding the electric vehicle frame, the frame is placed on the tooling. Then, the controller activates the telescopic cylinder 202 to extend. During the extension of the telescopic cylinder 202, the rigid clamping plate 203 moves closer to the rigid clamping plate 204 until the rigid clamping plates 203 and 204 completely clamp and fix the electric vehicle frame. At this point, the controller activates the telescopic cylinder 202 to stop extending and position it. This achieves rigid clamping of the electric vehicle frame, preventing significant positional displacement during welding and ensuring welding quality. As the telescopic cylinder 202 moves the rigid clamping plate 203, one end of the limiting rod 205 can slide freely inside the telescopic cylinder 202, allowing it to move synchronously with the rigid clamping plate 203. Since the limiting rod 205 provides radial support to the rigid clamping plate 203, it essentially distributes the radial pressure on the telescopic cylinder 202's extension end, reducing wear and extending the equipment's service life.

[0024] like Figures 3-5 As shown, the telescopic assembly 4 includes a mounting base 41 fixedly installed on the top surface of the base 1. A telescopic cylinder 42 is fixedly installed on the side wall of the mounting base 41 facing the electric vehicle frame. Several limiting rods 43 are slidably installed inside the telescopic cylinder 42. After the electric vehicle frame completes the above clamping and positioning, the controller controls the extension cylinder 42 to extend and simultaneously drive the clamping component 5 to move towards the position close to the electric vehicle frame, providing a power basis for subsequent position correction of the electric vehicle frame connection.

[0025] like Figures 4-9 As shown, each set of clamping components 5 includes a housing 51. A fixing block 52 is fixedly installed on the side wall of one of the housings 51. A positioning hole 58 is opened on the side wall of the fixing block 52 facing the electric vehicle frame. An annular pressure sensor 53 is embedded and fixedly installed on the side wall of the fixing block 52 facing the electric vehicle frame. The positioning hole 58 is spatially located in the inner circle of the annular pressure sensor 53. A fixing block 54 is fixedly installed on the side wall of the other housing 51 diagonally opposite. A positioning rod 55 is fixedly installed on the side wall of the fixing block 54 facing the electric vehicle frame. The positioning rod 55 and the positioning hole 58 are concentrically arranged. During the process of the two outer shells 51 approaching each other, if there is no misalignment between the two outer shells 51, they can merge into a perfect circle. The end of the positioning rod 55 is inserted into the positioning hole 58 without contacting the annular pressure sensor 53. At this time, the clamping operation is normal. After a long period of operation, if the two outer shells 51 deviate slightly, it will cause defects in batch products because it is difficult to see with the naked eye. However, the end of the positioning rod 55 in this application is set as an arc surface. During the process of merging the two outer shells 51, even if there is a slight misalignment, the guiding effect of the arc surface can be used to make the positioning rod 55 accurately insert into the positioning hole 58, realizing the function of automatic correction, ensuring the concentricity of the electric vehicle frame connection, and improving the welding quality. In addition, when the degree of misalignment between the two outer shells 51 exceeds the error range, the positioning rod 55 will contact the annular pressure sensor 53 during the insertion of the positioning hole 58. This causes the annular pressure sensor 53 to generate an electrical signal and feed it back to the controller. The controller will then determine that the error is too large and immediately sound an alarm, so that the operator can repair it in time to avoid batch accidents.

[0026] like Figure 8 and Figure 9 As shown, a pair of sliding grooves 56 are symmetrically provided inside the outer shell 51, and an installation groove 57 is also provided inside the outer shell 51. The two sliding grooves 56 and the installation groove 57 are connected in a continuous manner. The outer shell 51 is fixedly connected to one end of the limiting rod 43. The displacement assembly 6 includes an arc-shaped plate 61 that is slidably installed inside two slide grooves 56. The side walls of the arc-shaped plate 61 are elastically connected to the side walls of the slide grooves 56 by a pair of springs 63. The springs 63 are used to achieve the reset effect of the arc-shaped plate 61. A pair of inclined guide plates 62 are symmetrically fixed on the arc-shaped outer wall of one side of the arc-shaped plate 61. An elastic pad 71 is fixedly installed on the arc-shaped outer wall on the other side of the arc plate 61 to compensate for the tolerance gap between the arc plate 61 and the tube wall of the electric vehicle frame, so that the arc plate 61 has a good clamping effect on the electric vehicle frame.

[0027] like Figure 8 and Figure 9 As shown, the pressing assembly 10 includes a pair of push rods 101 that are slidably mounted on the side wall of the housing 51. The two push rods 101 are fixedly connected to the telescopic cylinder 42 via a connecting block 102. The connecting block 102 is elastically connected to the side wall of the housing 51 via a pair of springs 103. The two push rods 101 are correspondingly arranged in the inner rings of the two springs 103. A U-shaped frame 104 is fixedly mounted on one end of each push rod 101 near the inclined guide plate 62. A roller 105 is rotatably mounted on each U-shaped frame 104, and each roller 105 is correspondingly rolled on the surface of the inclined guide plate 62.

[0028] Specifically, such as Figures 3-9 As shown, before welding the electric vehicle frame, the electric vehicle frame is placed on the tooling. Then, the controller activates the telescopic cylinder 202 to move the rigid clamping plate 203 closer to the rigid clamping plate 204, thus achieving rigid clamping of the electric vehicle frame. The controller controls the telescopic cylinder 42 to extend, and simultaneously drives the clamping assembly 5 and the displacement assembly 6 to move towards the electric vehicle frame through the connecting block 102, the top rod 101, the U-shaped frame 104 and the roller 105. During this process, the positioning rod 55 and the positioning hole 58 cooperate to correct the concentricity until the two opposing symmetrical shells 51 are completely merged. Under the elastic force of the spring 103, the elastic pad 71 is tightly attached to the tube wall of the electric vehicle frame, compensating for the tolerance gap between the arc plate 61 and the tube wall of the electric vehicle frame, so that the arc plate 61 has a good clamping effect on the electric vehicle frame. The elastic force of the spring 103 can be selected according to the actual needs, and the elastic force it provides ensures that the correction operation of the misalignment at the connection of the electric vehicle frame can be achieved. When the two outer shells 51 are completely merged with the positioning rod 55 and the positioning hole 58, they form a perfect circle, so that the connection of the clamped electric vehicle frame is concentric. Even if there is a slight deviation at the connection during the clamping of the electric vehicle frame, this correction method can be used to correct it in time before welding, ensuring the subsequent welding quality.

[0029] To address the technical problem of incomplete welds caused by gaps at the joints during the welding process of electric vehicle frames, the following preferred technical solution is provided: like Figure 8 and Figure 9 As shown, several sealing pads 72 are fixedly installed on the side wall of the elastic pad 71 facing the electric vehicle frame; a negative pressure assembly 8 is provided inside the outer shell 51; the negative pressure assembly 8 includes several piston rods 81 that are slidably installed through the arc plate 61 and the elastic pad 71, and a piston is fixedly installed at the end of each piston rod 81 near the sealing pad 72, and the end of each piston rod 81 away from the sealing pad 72 is elastically connected to the side wall of the inner cavity of the outer shell 51 through a spring 83; The inner cavity of the outer shell 51 is provided with a guide assembly 9. The guide assembly 9 includes a crossbar 91 fixedly installed on the side wall of the inner cavity of the outer shell 51. Several protrusions 92 are fixedly installed on the side wall of the crossbar 91 facing the spring 83. Each piston rod 81 is provided with a relief groove 82, and the crossbar 91 is disposed through the relief groove 82. Specifically, when the controller determines that the telescopic cylinder 42 has reached the preset extension position, it indicates that the correction is complete. At this time, the elastic pad 71 is tightly attached to the tube wall of the electric vehicle frame, and the connection of the electric vehicle frame is aligned. To avoid gaps at the frame connection during the correction process that could lead to subsequent incomplete welding, the specific operation of this application is as follows: Telescopic cylinder 42 continues to extend and compress spring 103. At this time, push rod 101 moves into the housing 51, simultaneously driving U-shaped frame 104 and roller 105 to move. During the movement, roller 105 applies pressure to inclined guide plate 62. Since inclined guide plate 62 has an inclined surface, it generates an axial component force. Under the action of the axial component force, roller 105 can push inclined guide plate 62, arc plate 61 and clamped frame for fine adjustment, and compress spring 63 in preparation for subsequent reset of inclined guide plate 62. Since the movement directions of two adjacent inclined guide plates 62 are opposite, the connection between the two parts of the electric vehicle frame can be squeezed towards the connection to eliminate the gap at the connection, ensuring that there is no gap while correcting and aligning, reducing the probability of poor welding at the connection, and further improving the welding quality. To ensure that the elastic pad 71 can still drive the frame to move after long-term use, the piston rod 81 will move synchronously during the movement of the arc plate 61. Under the guidance of the protrusion 92, the piston rod 81 and the piston move together in the arc plate 61. Due to the sealing effect of the sealing gasket 72, a negative pressure adsorption effect can be generated inside the arc plate 61 when the piston rod 81 and the piston move. This can then adsorb the tube wall of the electric vehicle frame. Under the dual action of negative pressure adsorption and the friction of the elastic pad 71, the arc plate 61 ensures that the electric vehicle frame can follow synchronously with each fine adjustment, thus improving the adjustment accuracy.

[0030] like Figures 11-13 As shown, the clamping component is configured as a flexible clamping assembly 30. The flexible clamping assembly 30 includes a mounting base 301 fixedly installed on the top surface of the base 1. A telescopic cylinder 302 is fixedly installed on the side wall of the vertical section of the mounting base 301 facing the electric vehicle frame. A flexible clamping plate 303 is fixedly installed on the side wall of the telescopic end of the telescopic cylinder 302. A flexible clamping plate 304 is fixedly installed on the top surface of the horizontal section of the mounting base 301. The flexible clamping plate 303 and the flexible clamping plate 304 are symmetrically arranged about the electric vehicle frame. Several limiting rods 305 are fixedly installed on the side wall of the flexible clamping plate 303 facing the telescopic cylinder 302. One end of the limiting rod 305 is slidably installed inside the telescopic cylinder 302. Similarly, the limiting rod 305 shares the radial pressure of the telescopic end of the telescopic cylinder 302, reduces the wear of the telescopic cylinder 302, and extends the service life of the equipment. Several hollow sleeves 306 are fixedly arranged in an array on the side walls of the inner cavities of flexible clamp 1 303 and flexible clamp 2 304 respectively. Several electromagnets 309 are also fixedly arranged in an array on the side walls of the inner cavities of flexible clamp 1 303 and flexible clamp 2 304 respectively, and the electromagnets 309 are correspondingly arranged inside the hollow sleeves 306. Several push rods 307 are slidably arranged in an array on the side walls of flexible clamp 1 303 and flexible clamp 2 304. Each push rod 307 is slidably arranged in the inner cavity of the hollow sleeve 306. A permanent magnet 310 is fixedly installed on the side wall of each push rod 307 facing the electromagnet 309. The permanent magnet 310 and the electromagnet 309 are aligned. The push rods 307 and the side walls of the inner cavities of flexible clamp 1 303 and flexible clamp 2 304 are elastically connected by springs 4 308 respectively. The main structure in this embodiment is basically the same as that in Embodiment 1 above. The same structures will not be described again. The only difference is that the rigid clamping component 20 is replaced with the flexible clamping component 30, as detailed below: During the welding process of electric vehicle frames, if rigid clamping components 20 are used to clamp each part of the frame, the advantage is that it can greatly prevent the frame from drifting significantly and ensure welding accuracy. However, if all rigid clamping components 20 are used to clamp in advance, the frame is locked by multiple rigid support points. At this time, if the joints are forcibly aligned by the above-mentioned straightening mechanism, huge forced assembly internal stress will be generated inside the frame body. After welding is completed and the tooling is loosened, the stress is released, and the frame will spring back and deform, or even develop welding cracks, which poses a quality hazard. In this embodiment, rigid clamping components 20 are used at appropriate locations to clamp various parts of the frame to prevent significant positional drift. However, in other appropriate locations, rigid clamping components 20 can be replaced with flexible clamping components 30. When placing the electric vehicle frame in the tooling, the frame is first rigidly clamped by the rigid clamping components 20 at several important locations. Then, the operator uses a controller to extend the telescopic cylinder 302, simultaneously moving the flexible clamping plate 303 towards the flexible clamping plate 304, thus achieving flexible clamping. During flexible clamping, the push rod 307 is obstructed by the electric vehicle frame, causing the corresponding push rod 307 to move towards the hollow sleeve. The internal retraction of 306 compresses the spring 308, achieving adaptive clamping of the electric vehicle frame. After adaptive clamping, the aforementioned correction operation is performed. During this process, the flexible clamping component 30 has a certain floating compensation capability, ensuring that the clamping force is evenly distributed, preventing localized compression deformation and stress concentration of the frame caused by single-point high-pressure clamping. In addition, compared to rigid clamping, this clamping method results in a lower total residual stress level inside the weld; the deformation fluctuation of the finished product after welding is smaller, and the dimensional consistency is better. In this embodiment, the combination of rigid clamping component 20 and flexible clamping component 30 achieves the effect of overall frame stability and localized adjustment. After the correction operation is completed, the controller energizes the electromagnet 309 and causes the electromagnet 309 to repel the permanent magnet 310, which can change the flexible clamping into rigid clamping, so as to prevent the frame from being randomly displaced during the welding process and improve the welding quality. After all the above operations are completed, the frame welding operation is finished. Then, reverse all the above operations to reset all the components and remove the welded frame for the next welding use. It should be noted that the number and position of replacing the rigid clamping component 20 with the flexible clamping component 30 can be implemented according to the actual production engineering standards. The installation quantity and position in this application are only for demonstrating its function.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding fixture based on an electric vehicle frame assembly, comprising a base (1), wherein mounting bracket one (2) and mounting bracket two (3) are respectively fixedly mounted on the top surface of the base (1), characterized in that: The mounting bracket 1 (2) and mounting bracket 2 (3) are respectively provided with a number of clamping components, which are used to clamp the electric vehicle frame. A number of telescopic components (4) are fixedly installed on the top surface of the base (1). Each telescopic component (4) has a pressing component (10) fixedly installed at its telescopic end. Each pressing component (10) is provided with a clamping component (5) for correcting the misalignment at the connection of the electric vehicle frame. The telescopic component (4) uses the pressing component (10) to press the clamping component (5) against the tube wall of the electric vehicle frame to correct the connection of the electric vehicle frame. A displacement component (6) for eliminating the gap between the connection of the electric vehicle frame is slidably installed in the inner cavity of the clamping component (5). A compensation component (7) is fixedly installed on the side wall of the displacement component (6) facing the electric vehicle frame to compensate for the tolerance gap between the displacement component (6) and the tube wall of the electric vehicle frame.

2. The welding fixture based on the electric vehicle frame assembly according to claim 1, characterized in that: The clamping element is configured as a rigid clamping assembly (20); The rigid clamping assembly (20) includes a mounting seat (201) fixedly installed on the top surface of the base (1). A telescopic cylinder (202) is fixedly installed on the side wall of the vertical section of the mounting seat (201) facing the electric vehicle frame. A rigid clamping plate (203) is fixedly installed on the side wall of the telescopic end of the telescopic cylinder (202). A rigid clamping plate (204) is fixedly installed on the top surface of the horizontal section of the mounting seat (201). The rigid clamping plate (203) and the rigid clamping plate (204) are symmetrically arranged about the electric vehicle frame. Several limiting rods (205) are fixedly installed on the side wall of the rigid clamping plate (203) facing the telescopic cylinder (202). One end of the limiting rod (205) is slidably installed inside the telescopic cylinder (202).

3. The welding fixture based on the electric vehicle frame assembly according to claim 1, characterized in that: The telescopic assembly (4) includes a mounting base two (41) fixedly installed on the top surface of the base (1). A telescopic cylinder two (42) is fixedly installed on the side wall of the mounting base two (41) facing the electric vehicle frame. Several limit rods two (43) are slidably installed inside the telescopic cylinder two (42).

4. The welding fixture based on the electric vehicle frame assembly according to claim 3, characterized in that: Each of the aforementioned clamping components (5) includes a housing (51). A fixing block (52) is fixedly installed on the side wall of one of the housings (51). A positioning hole (58) is opened on the side wall of the fixing block (52) facing the electric vehicle frame. An annular pressure sensor (53) is embedded and fixedly installed on the side wall of the fixing block (52) facing the electric vehicle frame. The positioning hole (58) is spatially located in the inner circle of the annular pressure sensor (53). A fixing block (54) is fixedly installed on the side wall of the other housing (51) diagonally opposite. A positioning rod (55) is fixedly installed on the side wall of the fixing block (54) facing the electric vehicle frame. The positioning rod (55) and the positioning hole (58) are concentrically arranged.

5. The welding fixture based on the electric vehicle frame assembly according to claim 4, characterized in that: The shell (51) has a pair of symmetrical sliding grooves (56) inside, and the shell (51) also has an installation groove (57) inside. The two sliding grooves (56) and the installation groove (57) are connected in a continuous manner. The shell (51) is fixedly connected to one end of the limiting rod (43). The displacement assembly (6) includes an arc plate (61) that is slidably installed inside two slide grooves (56). The sidewalls of the arc plate (61) are elastically connected to the sidewalls of the slide grooves (56) by a pair of springs (63). A pair of inclined guide plates (62) are symmetrically fixed on the arc-shaped outer wall of one side of the arc plate (61).

6. The welding fixture based on the electric vehicle frame assembly according to claim 5, characterized in that: An elastic pad (71) is fixedly installed on the arc-shaped outer wall on the other side of the arc plate (61).

7. The welding fixture based on the electric vehicle frame assembly according to claim 5, characterized in that: The pressing assembly (10) includes a pair of push rods (101) that are slidably mounted on the side wall of the outer shell (51). The two push rods (101) are fixedly connected to the telescopic cylinder (42) through a connecting block (102). The connecting block (102) is elastically connected to the side wall of the outer shell (51) through a pair of springs (103). The two push rods (101) are respectively set in the inner ring of the two springs (103). A U-shaped frame (104) is fixedly installed at one end of each push rod (101) near the inclined guide plate (62). A roller (105) is rotatably mounted on each U-shaped frame (104), and each roller (105) is correspondingly rolled on the surface of the inclined guide plate (62).

8. The welding fixture based on the electric vehicle frame assembly according to claim 6, characterized in that: Several sealing pads (72) are fixedly installed on the side wall of the elastic pad (71) facing the electric vehicle frame. The housing (51) is provided with a negative pressure assembly (8); the negative pressure assembly (8) includes a number of piston rods (81) that are slidably mounted on the arc plate (61) and the elastic pad (71). Each piston rod (81) has a piston fixedly mounted at one end near the sealing gasket (72), and the end of each piston rod (81) away from the sealing gasket (72) is elastically connected to the side wall of the inner cavity of the housing (51) through a spring three (83).

9. The welding fixture based on the electric vehicle frame assembly according to claim 8, characterized in that: The inner cavity of the outer shell (51) is provided with a guide assembly (9). The guide assembly (9) includes a crossbar (91) fixedly installed on the side wall of the inner cavity of the outer shell (51). Several protrusions (92) are fixedly installed on the side wall of the crossbar (91) facing the spring (83). Each piston rod (81) is provided with a relief groove (82). The crossbar (91) is disposed through the relief groove (82).

10. The welding fixture based on the electric vehicle frame assembly according to claim 9, characterized in that: The clamping element is configured as a flexible clamping assembly (30); The flexible clamping assembly (30) includes a mounting base three (301) fixedly installed on the top surface of the base (1). A telescopic cylinder three (302) is fixedly installed on the side wall of the vertical section of the mounting base three (301) facing the electric vehicle frame. A flexible clamping plate one (303) is fixedly installed on the side wall of the telescopic end of the telescopic cylinder three (302). A flexible clamping plate two (304) is fixedly installed on the top surface of the horizontal section of the mounting base three (301). The flexible clamping plate one (303) and the flexible clamping plate two (304) are symmetrically arranged about the electric vehicle frame. Several limiting rods three (305) are fixedly installed on the side wall of the flexible clamping plate one (303) facing the telescopic cylinder three (302). One end of the limiting rod three (305) is slidably installed inside the telescopic cylinder three (302). Several hollow sleeves (306) are fixedly arranged in an array on the side walls of the inner cavities of the first flexible clamp (303) and the second flexible clamp (304). Several electromagnets (309) are also fixedly arranged in an array on the side walls of the inner cavities of the first flexible clamp (303) and the second flexible clamp (304), and the electromagnets (309) are correspondingly arranged inside the hollow sleeves (306). The side walls of the first flexible clamp (303) and the second flexible clamp (304) are arranged in an array for through sliding. Several push rods (307) are installed, and each push rod (307) is slidably installed in the inner cavity of the hollow sleeve (306). A permanent magnet (310) is fixedly installed on the side wall of each push rod (307) facing the electromagnet (309). The permanent magnet (310) and the electromagnet (309) are aligned. The push rod (307) is elastically connected to the side wall of the inner cavity of the first flexible clamp (303) and the second flexible clamp (304) by the fourth spring (308).

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