Automobile welding fixture with precise welding points

Abstract

This invention discloses an automotive welding fixture with precise welding points, belonging to the field of welding auxiliary tooling technology. It includes a main welding fixture and a secondary welding fixture sharing a common welding frame. A negative pressure component and a positioning component on a negative pressure cylinder perform negative pressure work through a negative pressure piston sliding within the cylinder. This, combined with a main suction cup and a secondary suction cup, applies negative pressure positioning to the automotive parts. An adjusting component and a tilting component on a protective cover adjust the distance between the main and secondary welding fixtures via a support arm. Based on pre-positioned clamping infrared triggering conditions, and combined with the negative pressure generated by on-site negative pressure work, this invention achieves a non-disassembly negative pressure positioning effect for large-volume automotive parts, eliminating the need for frequent manual intervention and effectively preventing mis-installation and omissions. It saves time and effort. Based on a trigger-activated zonal control mechanism, it employs a combination of distance adjustment and tilt adjustment to meet the clamping and positioning requirements of automotive parts of different sizes.

Description

Technical Field

[0001] This invention relates to the field of welding fixtures, and in particular to an automotive welding fixture with precise welding points. Background Technology

[0002] Welding fixtures are a general term for specialized tools and devices used in automobile manufacturing to clamp and position workpieces to complete body assembly and welding operations. By accurately positioning and clamping parts, they can ensure welding quality and improve production efficiency. According to their uses, they can be divided into assembly fixtures, welding fixtures, and composite assembly and welding fixtures; according to the body manufacturing level, they can be divided into assembly welding fixtures, sub-assembly welding fixtures, and body assembly welding fixtures.

[0003] When welding large automotive parts, welding fixtures are required. Usually, several clamping tools are used manually to clamp and position the automotive parts one by one. This method is not only time-consuming and labor-intensive, but also prone to mis-installation and omission. As a result, the automotive parts may become loose and shift during subsequent welding operations, which directly affects the quality of the weld. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing automotive welding fixtures with precise welding points, the present invention is proposed.

[0006] Therefore, the problem to be solved by this invention is how to solve the problem of misinstallation and omission when manually clamping automotive parts one by one with the help of several clamping fixtures.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an automotive welding fixture with precise welding points, comprising a main welding fixture and a secondary welding fixture sharing a welding frame, wherein a negative pressure component and a positioning component on a negative pressure cylinder perform negative pressure work through a negative pressure piston sliding in the negative pressure cylinder, and a main suction cup and a secondary suction cup apply negative pressure positioning measures to the automotive parts, wherein an adjusting component and a tilting component on a protective cover adjust the distance between the main welding fixture and the secondary welding fixture through a support arm, and a secondary differential wheel adjusts the angle of the main welding fixture and the secondary welding fixture as a whole.

[0008] As a preferred embodiment of the automotive welding fixture with precise welding points described in this invention, the negative pressure assembly further includes a dual-head motor embedded in the welding frame, and main bevel gears are fixed on the two output shafts of the dual-head motor. Secondary bevel gears are diagonally arranged on the outer sides of the two sets of main bevel gears, and an electric push rod that rotates with the negative pressure cylinder is fixed on the outer side of the secondary bevel gears. Cams are fixed on the outer sides of the two sets of electric push rods, and connecting rods that are hinged to the negative pressure piston rotate on the cams.

[0009] As a preferred embodiment of the automotive welding fixture with precise welding points described in this invention, the positioning component further includes a four-way valve connected to the outer end of the negative pressure cylinder, and an exhaust head and a pressure relief nozzle are respectively connected to the four-way valve. Metal hoses are connected to both sets of four-way valves, and a negative pressure main pipe fixed to the main welding fixture is transversely connected to the metal hoses and connected to the main suction cup.

[0010] As a preferred embodiment of the automotive welding fixture with precise welding points described in this invention, wherein: the outer ends of the two sets of negative pressure main pipes are connected to one-way valves, and the outer ends of the one-way valves are connected to telescopic hoses and connected to auxiliary suction cups; the two sets of main suction cups are fixed inside the main welding fixture, and the auxiliary suction cups are fixed inside the two sets of auxiliary welding fixtures.

[0011] As a preferred embodiment of the automotive welding fixture with precise welding points described in this invention, wherein: both sets of main and auxiliary suction cups are equipped with flow equalization plates, and pressure sensors are embedded in the flow equalization plates; both the main and auxiliary welding fixtures are fixed with positioning components; both the main and auxiliary welding fixtures are fixed with clamping seats; and infrared sensors for monitoring the placement status of automotive parts are provided.

[0012] As a preferred embodiment of the automotive welding fixture with precise welding points described in this invention, the adjusting assembly further includes a main spherical gear sleeved on the two output shafts of the dual-head motor, and a driven spherical gear is provided on the outer side of the main spherical gear. An electric push rod is fixed on the outer side of the two sets of driven spherical gears, and a threaded rod is fixed on the outer side of the electric push rod.

[0013] As a preferred embodiment of the automotive welding fixture with precise welding points described in this invention, the two sets of threaded rods are threadedly connected to threaded sleeves, and displacement sensors are fixed on the threaded sleeves. Support arms that slide through the welding frame and protective cover are fixed on the outer sides of the two sets of threaded sleeves.

[0014] As a preferred embodiment of the automotive welding fixture with precise welding points described in this invention, the main welding fixture has a sliding opening on its outer side, and the auxiliary welding fixture has a sliding member fixed on its inner side that slides through the sliding opening; the main welding fixture has an array of fixed corner plates on its outer side, and the auxiliary welding fixture has an array of fixed sliding strips that slide with the corner plates. The welding frame has a main electrode plate fixed inside, and a secondary electrode plate that is triggered and matched with the main electrode plate is fixed from the inside of the sprocket, and triggers the start and stop control of the dual-head motor.

[0015] As a preferred embodiment of the automotive welding fixture with precise welding points described in this invention, the tilting assembly further includes a secondary spherical gear disposed outside the main spherical gear, and an electric push rod three is fixed to the outside of the secondary spherical gear. Damping slide cylinders are fixed to the outside of the two sets of electric push rods three, and a damping slide rod slides through the damping slide cylinder.

[0016] As a preferred embodiment of the automotive welding fixture with precise welding points described in this invention, the outer sides of the two sets of damping slide rods are fixed with a main differential wheel that rotates with the protective cover and mesh with a secondary differential wheel, and an angle sensor is fixed with the outer side of the secondary differential wheel. The welding frame has a main electrode plate two fixed inside, and a secondary electrode plate two that is triggered and matched with the main electrode plate two is fixed inside the secondary spherical gear, and triggers and controls the opening and closing of the dual-head motor.

[0017] The beneficial effects of this invention are as follows: Based on the infrared triggering conditions of pre-positioned clamping and combined with the negative pressure generated by the negative pressure work on site, a negative pressure positioning effect without disassembly is achieved for large-volume automotive parts. Frequent manual intervention is not required, and the phenomenon of incorrect or missing installation is effectively avoided, saving time and effort. Based on the zoned control mechanism of trigger opening and closing, a combination of spacing adjustment and tilt adjustment is adopted to meet the clamping and positioning requirements of automotive parts of different sizes, while also achieving multi-directional tilt welding effect without frequent switching of welding stations, making it widely applicable. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an initial state diagram of the overall structure of an automotive welding fixture with precise welding points.

[0020] Figure 2 This is a diagram showing the overall structural adjustment state of an automotive welding fixture with precise welding points.

[0021] Figure 3 This is a diagram showing the tilted state of the overall structure of an automotive welding fixture with precise welding points.

[0022] Figure 4This is a bottom view of a partial structure of an automotive welding fixture with precise welding points.

[0023] Figure 5 A bottom view of the main welding fixture, auxiliary welding fixture, negative pressure cylinder, negative pressure assembly, and positioning assembly of an automotive welding fixture with precise welding points.

[0024] Figure 6 An enlarged overhead section view of the negative pressure assembly and positioning assembly of an automotive welding fixture with precise welding points.

[0025] Figure 7 A top-view enlarged view of the main welding fixture, auxiliary welding fixture, and spacing adjustment assembly of an automotive welding fixture with precise welding points.

[0026] Figure 8 Bottom view of the main assembly welding fixture, auxiliary assembly welding fixture, and tilting assembly of an automotive welding fixture with precise welding points.

[0027] Figure 9 A partial top view of the sub-assembly welding fixture and tilting assembly of an automotive welding fixture with precise welding points.

[0028] Figure 10 A partial bottom cross-sectional view of an inclined assembly of an automotive welding fixture with precise welding points.

[0029] In the diagram: 1. Welding frame; 2. Main welding fixture; 3. Secondary welding fixture; 4. Negative pressure cylinder; 51. Dual-head motor; 52. Main bevel gear; 53. Secondary bevel gear; 54. Electric push rod one; 55. Cam; 56. Connecting rod; 57. Negative pressure piston; 61. Four-way valve; 62. Metal hose; 63. Negative pressure main pipe; 64. Main suction cup; 65. One-way valve; 66. Telescopic hose; 67. Secondary suction cup; 7. Exhaust head; 8. Pressure relief nozzle; 9. Flow equalization plate; 10. Pressure sensor; 11. Positioning component; 12. Clamping seat; 13. Infrared sensor; 14. Protective device. 151. Main sprocket gear; 152. Driven sprocket gear; 153. Electric push rod II; 154. Threaded rod; 155. Threaded sleeve; 156. Displacement sensor; 157. Support arm; 16. Sliding port; 17. Sliding component; 18. Angle plate; 19. Sliding bar; 20. Main electrode plate I; 21. Secondary electrode plate I; 221. Secondary sprocket gear; 222. Electric push rod III; 223. Damping slide cylinder; 224. Damping slide rod; 225. Main differential wheel; 226. Secondary differential wheel; 227. Angle sensor; 23. Main electrode plate II; 24. Secondary electrode plate II. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0033] Example 1, referring to Figures 1-10 This is the first embodiment of the present invention. This embodiment provides an automotive welding fixture with precise welding points, including a main welding fixture 2 and a secondary welding fixture 3 with a shared welding frame 1. The negative pressure component and positioning component on the negative pressure cylinder 4 perform negative pressure work by sliding the negative pressure piston 57 in the negative pressure cylinder 4, and apply negative pressure positioning measures to the automotive parts in conjunction with the main suction cup 64 and the secondary suction cup 67.

[0034] Specifically, it also includes a dual-head motor 51 embedded in the welding frame 1, and main bevel gears 52 are fixed on the two output shafts of the dual-head motor 51. Auxiliary bevel gears 53 are arranged diagonally on the outer side of the two sets of main bevel gears 52, and electric push rods 54 that rotate with the negative pressure cylinder 4 are fixed on the outer side of the auxiliary bevel gears 53. The meshing stroke between the two sets of auxiliary bevel gears 53 and the main bevel gears 52 is adjusted to the correct position through the two sets of diagonally distributed electric push rods 54.

[0035] Two sets of electric push rods 54 are fixed with cams 55 on their outer sides, and a connecting rod 56 hinged to the negative pressure piston 57 rotates on the cams 55. The negative pressure piston 57 reciprocates in the negative pressure cylinder 4 to provide negative pressure for the positioning of large-volume automotive parts, replacing the complicated positioning method of manual use with several clamping fixtures, which is more time-saving and labor-saving.

[0036] Specifically, it also includes a four-way valve 61 connected to the outer end of the negative pressure cylinder 4, and the four-way valve 61 is connected to an exhaust head 7 and a pressure relief nozzle 8 respectively. Through the exhaust head 7, during the negative pressure work of the negative pressure piston 57, the air sucked in the main suction cup 64 and the auxiliary suction cup 67 is discharged, forcing the main suction cup 64 and the auxiliary suction cup 67 to be in a negative pressure vacuum state, thereby improving the negative pressure positioning stability of the automotive parts.

[0037] The pressure relief nozzle 8 releases the negative pressure positioning action between the automotive parts and the main suction cup 64 and the auxiliary suction cup 67, restoring the normal pressure of the main suction cup 64 and the auxiliary suction cup 67, forcing them to separate from the automotive parts, and releasing the negative pressure positioning measures of the automotive parts.

[0038] Two sets of four-way valves 61 are connected to metal hoses 62, and the metal hoses 62 are laterally connected to a negative pressure main pipe 63 fixed to the main assembly welding fixture 2, and connected to the main suction cup 64. The main suction cup 64 in the main assembly welding fixture 2 area provides the main negative pressure positioning measures for large-volume automotive parts.

[0039] The outer ends of the two sets of negative pressure main pipes 63 are connected to one-way valves 65, and the outer ends of the one-way valves 65 are connected to telescopic hoses 66 and connected to auxiliary suction cups 67. Through the one-way valves 65, the channel from the negative pressure main pipe 63 to the telescopic hoses 66 is controlled to open and close in one direction, preventing the backflow of negative pressure and extending the transmission stroke of negative pressure in the negative pressure main pipe 63, so as to meet the auxiliary negative pressure positioning requirements of the two sets of auxiliary welding fixtures 3-zone auxiliary suction cups 67 for large-volume automotive parts.

[0040] Two sets of main suction cups 64 are fixed inside the main welding fixture 2, and auxiliary suction cups 67 are fixed inside two sets of auxiliary welding fixtures 3. The auxiliary suction cups 67 in the two sets of auxiliary welding fixtures 3 provide auxiliary negative pressure positioning measures for large-volume automotive parts, improve the comprehensiveness of negative pressure positioning for automotive parts of different volumes, and apply equal negative pressure force to them, forcing the main welding fixture 2 and the two sets of auxiliary welding fixtures 3 to be more firmly and reliably positioned with automotive parts of different volumes, avoiding loosening and displacement during subsequent welding operations, and improving the quality of weld points.

[0041] Both main suction cups 64 and auxiliary suction cups 67 are equipped with small electric shut-off valves. After the two main suction cups 64 and auxiliary suction cups 67 have completed the negative pressure positioning of the automotive parts, when the negative pressure piston 57 stops working in the negative pressure cylinder 4, the two main suction cups 64 and auxiliary suction cups 67 lose the negative pressure supply. The small electric shut-off valves then cut off the vacuum pressure remaining between the automotive parts and the two main suction cups 64 and auxiliary suction cups 67, preventing instability in the negative pressure positioning action between the two main suction cups 64 and auxiliary suction cups 67 and the automotive parts due to minor leaks in the pipeline. This ensures that the automotive parts in the negative pressure positioning state remain stable during welding.

[0042] Both main suction cups 64 and auxiliary suction cups 67 are equipped with flow equalization plates 9. Through the flow equalization plates 9, the negative pressure suction between the two main suction cups 64 and auxiliary suction cups 67 and the automotive parts is evenly distributed, which makes the negative pressure between the two main suction cups 64 and auxiliary suction cups 67 and the automotive parts more stable and the negative pressure positioning more secure. In addition, the flow equalization plates 9 are equipped with pressure sensors 10, which monitor the negative pressure suction between the two main suction cups 64 and auxiliary suction cups 67 and the automotive parts in real time. This prevents the negative pressure from being too high, which could cause adsorption deformation at the adsorption and positioning end of the automotive parts, and the negative pressure from being too low, which could cause the negative pressure positioning of the automotive parts to be unstable and loose or displaced.

[0043] Positioning components 11 are fixed on both the main welding fixture 2 and the auxiliary welding fixture 3. The positioning components 11 facilitate the precise placement of automotive parts on the main welding fixture 2 and the auxiliary welding fixture 3, avoiding misplacement and facilitating the precise exposure of welding points on the automotive parts, enabling precise welding operations to be performed according to the precisely positioned welding points.

[0044] Both the main welding fixture 2 and the auxiliary welding fixture 3 are fixed with clamping seats 12. Through the clamping seats 12, the automotive parts placed on the main welding fixture 2 and the auxiliary welding fixture 3 are pre-clamped and positioned. Combined with negative pressure positioning measures, double positioning redundancy is applied to the automotive parts.

[0045] An infrared sensor 13 is provided for monitoring the placement status of automotive parts. After the automotive parts are placed in place on the main welding fixture 2 and the auxiliary welding fixture 3, the infrared sensor 13 enables the opening and closing control of the two sets of electric push rods 54 based on the infrared signal shielding triggering mechanism, thereby improving the overall coordination of the placement action of automotive parts and the negative pressure positioning measures.

[0046] The positioning components 11, clamping seats 12, and infrared sensors 13 on the main welding fixture 2 and the auxiliary welding fixture 3, as well as the subsequent main suction cup 64 and auxiliary suction cup 67, are all detachable pre-installed components. The specific details vary depending on the specifications, positioning, and welding points of each automotive part, and will not be elaborated here.

[0047] In use, the automotive parts are first placed in the positioning parts 11 and clamping seats 12 on the main welding fixture 2 and the auxiliary welding fixture 3. Based on the condition of precise welding points, the pre-positioning and clamping action of the automotive parts is completed. The automotive parts placed in position also block the infrared signal emitted by the infrared sensor 13 and trigger the control of two sets of electric push rods 54 to open synchronously. This drives two sets of diagonally distributed auxiliary bevel gears 53 to move inward synchronously. After they are engaged with the meshing part of the two sets of main bevel gears 52, the PLC control panel delays the control of the dual-head motor 51 to open. Through the two sets of meshing main bevel gears 52, the cams 55 on the auxiliary bevel gears 53 are driven to rotate synchronously. The two sets of cams 55 drive the negative pressure pistons 57 on the two connecting rods 56 to perform reciprocating negative pressure work in the two sets of negative pressure cylinders 4.

[0048] The negative pressure generated by the work done in the two sets of negative pressure cylinders 4 is evacuated through the metal hoses 62 on the two sets of four-way valves 61, through the negative pressure main pipe 63, and the air between the two sets of main suction cups 64 and the placed automotive parts is evacuated. The air is then discharged through the two sets of exhaust heads 7 until the two sets of main suction cups 64 reach a negative pressure vacuum state. That is, the two sets of main suction cups 64 perform negative pressure positioning of the automotive parts in the main assembly welding fixture 2 area. At the same time, the negative pressure in the negative pressure main pipe 63 is evacuated through the telescopic hoses 66 on the two sets of one-way valves 65, and the air between the two sets of auxiliary suction cups 67 and the placed automotive parts is evacuated. The air is then discharged through the two sets of exhaust heads 7 until the two sets of auxiliary suction cups 67 reach a negative pressure vacuum state. That is, the two sets of auxiliary suction cups 67 perform negative pressure positioning of the automotive parts in the auxiliary assembly welding fixture 3 area, and then the welding operation is carried out according to the precise welding points.

[0049] When the two sets of main suction cups 64 and the two sets of auxiliary suction cups 67 apply negative pressure to the automotive parts in the main welding fixture 2 and the auxiliary welding fixture 3, the internal negative pressure is also at the preset safety threshold of the pressure sensor 10. The sensor triggers the dual-head motor 51 and the two sets of electric push rods 54 to close and reset in succession. However, the two sets of main suction cups 64 and the two sets of auxiliary suction cups 67 still maintain a stable negative pressure positioning state for the automotive parts in the auxiliary welding fixture 3. If it is necessary to release the negative pressure positioning measures of the automotive parts, the two sets of pressure relief nozzles 8 are opened directly to restore the normal pressure between the automotive parts and the two sets of main suction cups 64 and the two sets of auxiliary suction cups 67, thus releasing the negative pressure and releasing the negative pressure positioning measures between the two sets of main suction cups 64 and the two sets of auxiliary suction cups 67 and the automotive parts.

[0050] The system first performs positioning and clamping on the automotive parts to accurately weld the points. After completing the initial positioning, the main suction cup 64 and the auxiliary suction cup 67 work together in a negative pressure positioning manner to achieve a uniform and comprehensive negative pressure positioning effect on the automotive parts in the main assembly welding fixture 2 and the two sets of auxiliary assembly welding fixtures 3. The action is smooth and without any delays or unnecessary movements. It eliminates the need for manual operation of several clamping fixtures one by one to complete the manual positioning of the automotive parts. When the positioning measures of the automotive parts are released, there is no need to manually release the clamping state of several clamping fixtures, which plays a role in positioning without disassembly and assembly, making it more convenient and labor-saving.

[0051] Example 2, refer to Figures 1-10 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0052] The spacing adjustment component and tilting component on the protective cover 14, through the support arm 157, expand and adjust the spacing between the main welding fixture 2 and the auxiliary welding fixture 3. Based on the zone control mechanism of trigger opening and closing, the combination of spacing adjustment and tilt adjustment is adopted to meet the clamping and positioning requirements of automotive parts of different sizes, while also achieving multi-directional tilt welding effect. There is no need to frequently switch welding stations, and the application range is wide.

[0053] Specifically, it also includes a main sprocket 151 mounted on the two output shafts of the dual-head motor 51, and a driven sprocket 152 is provided on the outer side of the main sprocket 151. Electric push rods 153 are fixed on the outer side of the two sets of driven sprockets 152, and threaded rods 154 are fixed on the outer side of the electric push rods 153. The meshing stroke between the two sets of driven sprockets 152 and the main sprocket 151 is adjusted to the correct position through the two electric push rods 153.

[0054] Two sets of threaded rods 154 are threadedly connected to threaded sleeves 155, and displacement sensors 156 are fixed on the threaded sleeves 155. Support arms 157 that slide through the welding frame 1 and the protective cover 14 are fixed on the outside of the two sets of threaded sleeves 155. The support arms 157 are fixed to the auxiliary welding fixture 3, and arc-shaped openings are provided on the welding frame 1 and the protective cover 14. The support arms 157 play a limiting support role during the forward and backward displacement and angle adjustment, thereby improving its operational stability.

[0055] Specifically, the main welding fixture 2 has a sliding opening 16 on its outer side, and the auxiliary welding fixture 3 has a sliding member 17 fixed on its inner side that slides through the sliding opening 16. The sliding opening 16 and the sliding member 17 provide sliding support between the auxiliary welding fixture 3 and the main welding fixture 2, thereby improving the expansion stability of the auxiliary welding fixture 3.

[0056] The outer sides of the main welding fixture 2, the auxiliary welding fixture 3, and the sliding member 17 are all provided with graduated grooves with fluorescent design. When the spacing of the auxiliary welding fixture 3 is extended and adjusted, the extension stroke length of the auxiliary welding fixture 3 and the sliding member 17 can be observed visually. Angle plates 18 are fixed on the outer side of the main welding fixture 2, and sliders 19 that slide with the angle plates 18 are fixed on the inner side of the auxiliary welding fixture 3. Through the angle plates 18 and the sliders 19, the auxiliary welding fixture 3 plays an auxiliary sliding support role during the spacing adjustment, ensuring that its extension action is stable.

[0057] The welding fixture 1 has a main electrode plate 20 fixed inside, and an auxiliary electrode plate 21 that is triggered and matched with the main electrode plate 20 is fixed from the inside of the spur gear 152. The dual-head motor 51 is triggered and controlled to start and stop. Based on the triggering mechanism, the distance between the main welding fixture 2 and the auxiliary welding fixture 3 can be quickly expanded and adjusted according to the different sizes of automotive parts, so as to meet the positioning and welding needs of automotive parts of different sizes and have a wide range of applications.

[0058] In use, after the two sets of main suction cups 64 and the two sets of auxiliary suction cups 67 apply negative pressure to the automotive parts in the main welding fixture 2 and the auxiliary welding fixture 3, the PLC control panel controls the two sets of electric push rods 153 to open synchronously. At the same time, the two sets of slave sprockets 152 move inward and lock into the meshing part of the two sets of main sprockets 151. Simultaneously, the auxiliary electrode plates 21 on the two sets of slave sprockets 152 also move inward and insert into the main electrode plates 20. Then, the main electrode plates 20 and auxiliary electrode plates 21 that are in place trigger the dual-head motor 51 to open. Through the two sets of main sprockets 151 that are in place, the threaded rods 154 on the two sets of slave sprockets 152 rotate synchronously in the forward direction.

[0059] Two threaded rods 154 drive the support arms 157 on the two sets of threaded sleeves 155 to expand outward synchronously, and the trajectory is monitored in real time by the displacement sensor 156 that moves synchronously with the two sets of threaded sleeves 155. At the same time, the two support arms 157 drive the two sets of auxiliary welding fixtures 3 and their auxiliary suction cups 67 to expand outward, increasing the distance between them and the main welding fixture 2, until the main welding fixture 2 and auxiliary welding fixture 3 after expansion and adjustment are the same as the current large-volume automotive parts. Then, the dual-head motor 51 and the two sets of electric push rods 153 are triggered and closed in succession. Since the auxiliary welding fixture 3 is extended to the position using a screw-connected displacement transmission method, the main welding fixture 2 and auxiliary welding fixture 3 remain stable and stationary.

[0060] Similarly, large-volume automotive parts are placed on the extended and adjusted main welding fixture 2 and auxiliary welding fixture 3. Then, two sets of main suction cups 64 and two sets of auxiliary suction cups 67 extend outwards simultaneously to position the automotive parts in the extended and adjusted main welding fixture 2 and auxiliary welding fixture 3 with negative pressure. Welding operations can then be performed according to the precise welding points. The spacing adjustment method can meet the positioning and welding needs of automotive parts of different lengths. There is no need to disassemble and assemble the welding fixtures, which saves time and effort and is easy to operate.

[0061] Example 3, referring to Figures 1-10 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0062] The secondary differential wheel 226 adjusts the angle of the main welding fixture 2 and the secondary welding fixture 3 as a whole. It adopts a tilt adjustment method to achieve multi-directional tilt welding effect for automotive parts of different sizes. It does not require frequent switching of welding stations and has a wide range of applications.

[0063] Specifically, it also includes a secondary sprocket 221 located outside the main sprocket 151, and an electric push rod 222 is fixed to the outside of the secondary sprocket 221. Through the two sets of electric push rods 222, the meshing stroke between the two sets of secondary sprockets 221 and the main sprocket 151 is adjusted to the correct position.

[0064] Two sets of electric push rods 222 are fixed with damping slide cylinders 223 on their outer sides, and damping slide rods 224 slide through the damping slide cylinders 223. Through the damping slide rods 224 and the damping slide cylinders 223, when the auxiliary welding fixture 3 is extended and adjusted, the auxiliary welding fixture 3 is forced to drive the damping slide rods 224 to perform adaptive push-pull sliding within the damping slide cylinders 223. During the extension and adjustment of the auxiliary welding fixture 3, the meshing stroke length requirements of the two sets of auxiliary spur gears 221 and main spur gears 151, as well as the two sets of main differential gears 225 and auxiliary differential gears 226 are met, so that their meshing action is not interfered with by the extension and adjustment action of the auxiliary welding fixture 3, and the angle adjustment and tilting operation can be performed normally.

[0065] The two sets of damping slide cylinders 223 are provided with triangular equidistant slide rail grooves, and slide rails fixed to the damping slide rod 224 slide in the slide rail grooves. The slide rail grooves and slide rails improve the stability of the pushing and pulling sliding action of the damping slide rod 224 in the damping slide cylinder 223. At the same time, when performing the angle adjustment and tilting operation, it is prevented that the damping slide rod 224 will spin freely in the damping slide cylinder 223, which would affect the overall tilting action of the main welding fixture 2 and the auxiliary welding fixture 3.

[0066] Specifically, the outer sides of the two sets of damping slide bars 224 are fixed with main differential wheels 225 that rotate with the protective cover 14 and mesh with secondary differential wheels 226. The secondary differential wheels 226 are fixed with the secondary welding fixture 3, and an angle sensor 227 is fixed on the outer side of the secondary differential wheels 226. The rotation angle of the secondary differential wheels 226 is monitored in real time through the angle sensor 227 to ensure that the main welding fixture 2 and the secondary welding fixture 3, and the automotive parts on them in the positioning state are in the tilted position, which is conducive to subsequent welding operations. The welding frame 1 has a main electrode plate 23 fixed inside, and the inner side of the auxiliary spherical gear 221 has an auxiliary electrode plate 24 that is triggered and matched with the main electrode plate 23. The dual-head motor 51 is triggered and controlled to start and stop. According to the welding position of the automotive parts, the main welding fixture 2 and the auxiliary welding fixture 3 and the automotive parts on them are adaptively tilted to meet the positioning and welding requirements of automotive parts in different positions.

[0067] In use, after the two sets of main suction cups 64 and the two sets of auxiliary suction cups 67 with adjustable / unadjusted spacing are in place with negative pressure on the automotive parts of the main welding fixture 2 and auxiliary welding fixture 3 with adjustable / unadjusted spacing, the PLC control panel controls the two sets of electric push rods 222 to open synchronously. At the same time, the two sets of auxiliary spherical gears 221 move inward synchronously and lock into the meshing part of the two sets of main spherical gears 151. Simultaneously, the auxiliary electrode plates 24 on the two sets of auxiliary spherical gears 221 also move inward and insert into the main electrode plates 23. Then, the main electrode plates 23 and auxiliary electrode plates 24 that are in place trigger the dual-head motor 51 to open. Through the two sets of main spherical gears 151 that are in place, the damping slide cylinders 223 and damping slide rods 224 on the two sets of auxiliary spherical gears 221 rotate forward / backward.

[0068] Meanwhile, the push-pull adjustable / unadjustable damping slide 223 and damping slide rod 224 drive the two sets of secondary differential wheels 226 to rotate forward / reverse through the two sets of main differential wheels 225. The angle sensor 227 monitors the adjustment angle in real time, synchronously driving the main welding fixture 2 and secondary welding fixture 3 with the spacing adjustable / unadjustable. The two sets of secondary welding fixtures 3 act as the active force, and the main welding fixture 2 acts as the passive force, driving the negative pressure positioning automotive parts on them to adjust the forward / reverse tilt angle to the correct position, and controlling the dual-head motor 5. 1. In the locked state, the self-locking of the dual-head motor 51 forces the two sets of auxiliary spur gears 221 and main spur gears 151, as well as the two sets of main differential gears 225 and auxiliary differential gears 226 to maintain a stable meshing state. The automotive parts on the main welding fixture 2 and auxiliary welding fixture 3 also remain stable and are subject to adaptive tilt adjustment at any time to meet the welding requirements of automotive parts under multi-directional adjustment. After the welding is completed, the dual-head motor 51 and the two sets of electric push rods 222 are controlled to close successively and reset to the horizontal state.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An automotive welding fixture with precise welding points, characterized in that: It includes a main welding fixture (2) and a secondary welding fixture (3) of a shared welding frame (1). The negative pressure component and positioning component on the negative pressure cylinder (4) perform negative pressure work by sliding the negative pressure piston (57) in the negative pressure cylinder (4). The main suction cup (64) and the secondary suction cup (67) apply negative pressure positioning measures to the automotive parts. The distance adjustment component and tilting component on the protective cover (14) adjust the distance between the main welding fixture (2) and the secondary welding fixture (3) through the support arm (157). The secondary differential wheel (226) adjusts the angle of the main welding fixture (2) and the secondary welding fixture (3) as a whole.

2. The automotive welding fixture with precise welding points as described in claim 1, characterized in that: The negative pressure assembly also includes a double-headed motor (51) embedded in the welding frame (1), and main bevel gears (52) are fixed on the two output shafts of the double-headed motor (51). A secondary bevel gear (53) is provided diagonally on the outer side of the two sets of main bevel gears (52), and an electric push rod (54) that rotates with the negative pressure cylinder (4) is fixed on the outer side of the secondary bevel gear (53). The outer side of each of the two sets of electric push rods (54) is fixed with a cam (55), and a connecting rod (56) hinged to the negative pressure piston (57) rotates on the cam (55).

3. The automotive welding fixture with precise welding points as described in claim 1, characterized in that: The positioning assembly also includes a four-way valve (61) connected to the outer end of the negative pressure cylinder (4), and an exhaust head (7) and a pressure relief nozzle (8) are connected to the four-way valve (61) respectively. The two sets of four-way valves (61) are connected to a metal hose (62), and a negative pressure main pipe (63) fixed to the main welding fixture (2) is connected laterally to the metal hose (62) and connected to the main suction cup (64).

4. The automotive welding fixture with precise welding points as described in claim 3, characterized in that: The outer ends of the two sets of negative pressure main pipes (63) are connected to one-way valves (65), and the outer ends of the one-way valves (65) are connected to telescopic hoses (66) and connected to auxiliary suction cups (67). The two sets of main suction cups (64) are fixed in the main welding fixture (2), and the auxiliary suction cups (67) are fixed in the two sets of auxiliary welding fixtures (3).

5. The automotive welding fixture with precise welding points as described in claim 1, characterized in that: Both sets of main suction cups (64) and auxiliary suction cups (67) are equipped with flow equalization plates (9), and pressure sensors (10) are embedded in the flow equalization plates (9). Positioning components (11) are fixed on the main welding fixture (2) and auxiliary welding fixture (3), and clamping seats (12) are fixed on the main welding fixture (2) and auxiliary welding fixture (3). Infrared sensors (13) for monitoring the placement status of automotive parts are also provided.

6. The automotive welding fixture with precise welding points as described in claim 2, characterized in that: The adjustable distance assembly also includes a main spur gear (151) sleeved on the two output shafts of the dual-head motor (51), and a driven spur gear (152) is provided on the outside of the main spur gear (151). Electric push rods (153) are fixed on the outside of the two sets of driven spur gears (152), and threaded rods (154) are fixed on the outside of the electric push rods (153).

7. The automotive welding fixture with precise welding points as described in claim 6, characterized in that: The two sets of threaded rods (154) are threaded with threaded sleeves (155), and displacement sensors (156) are fixed on the threaded sleeves (155). The two sets of threaded sleeves (155) are fixed with support arms (157) that slide through the welding frame (1) and the protective cover (14).

8. The automotive welding fixture with precise welding points as described in claim 6, characterized in that: The main welding fixture (2) has a sliding opening (16) on its outer side, and the auxiliary welding fixture (3) has a sliding member (17) that slides through the sliding opening (16) on its inner side. The main welding fixture (2) has an array of fixed corner plates (18), and the auxiliary welding fixture (3) has an array of fixed sliding strips (19) that slide with the corner plates (18). The welding frame (1) has a main electrode plate (20) fixed inside, and a secondary electrode plate (21) that is triggered and matched with the main electrode plate (20) is fixed from the inside of the sprocket (152).

9. The automotive welding fixture with precise welding points as described in claim 6, characterized in that: The tilting assembly also includes a secondary sprocket (221) disposed outside the main sprocket (151), and an electric push rod three (222) is fixed outside the secondary sprocket (221). A damping slide cylinder (223) is fixed outside the two sets of electric push rod three (222), and a damping slide rod (224) slides through the damping slide cylinder (223).

10. The automotive welding fixture with precise welding points as described in claim 9, characterized in that: The outer sides of the two sets of damping slide bars (224) are fixed with a main differential wheel (225) that rotates with the protective cover (14) and mesh with a secondary differential wheel (226), and an angle sensor (227) is fixed on the outer side of the secondary differential wheel (226). The welding frame (1) has a main electrode plate two (23) fixed inside, and the inner side of the auxiliary spherical gear (221) has an auxiliary electrode plate two (24) that is triggered and matched with the main electrode plate two (23).

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