Three-point type welding tool for cold punching part of three-way catalytic converter

Abstract

The utility model relates to the field of welding tools, in particular to a three-point type welding tool for a cold punching part of a three-way catalytic converter. The technical problems that in a three-way catalytic converter part of an exhaust system of a commercial engine in the prior art, sub-parts are usually difficult to position and feed quickly, the two sub-parts are difficult to weld together quickly, the cambered surface profile tolerance of the parts is difficult to fit during welding of the two sub-parts, and the product quality is difficult to improve are solved. According to the technical scheme, the three-point type welding tool for the cold punching part of the three-way catalytic converter comprises a supporting assembly. According to the welding device, the limiting structure for the sub-parts and the stable moving feeding structure for the sub-parts are arranged, the sub-parts can be rapidly and stably placed in the limiting structure to be welded, and therefore the two sub-parts with the positions rapidly determined can be conveniently welded together; the stability is good when the parts are placed, and the product quality can be improved.

Description

Technical Field

[0001] The utility model belongs to the field of welding tools, in particular to a three-point welding tool for cold-punched parts of a three-way catalytic converter. Background Art

[0002] In the exhaust emission system of heavy-duty diesel engines, the exhaust three-way catalytic converter has added multiple modules on the original basis. While the process has become complicated, the cost has increased significantly, which needs to be offset by the optimization of the parts processing technology. In the existing technology, it is usually difficult to quickly position and load the sub-parts of the three-way catalytic converter components of the exhaust system of commercial engines, and it is difficult to quickly weld two sub-parts together. When welding two sub-parts, it is difficult to make the arc contour of the parts match the tolerance, and it is difficult to improve the product quality. Utility Model Content

[0003] In order to overcome the problems of three-way catalytic converter components of exhaust systems of commercial engines in the prior art, it is usually difficult to quickly position and load sub-components, difficult to quickly weld two sub-components together, difficult to make the arc profile of the parts match the tolerance when welding the two sub-components, and difficult to improve product quality.

[0004] The technical solution of the utility model is: a three-point welding tool for cold-punched parts of a three-way catalytic converter, including a support component; also including a tooling component, a bearing component, a servo transmission component, a loading and unloading component and a positioning component; the upper end of the support component is provided with a tooling component; the upper end of the support component is provided with a bearing component; the bearing component is provided with a servo transmission component; the servo transmission component is provided with a loading and unloading component for loading and unloading parts; the servo transmission component and the loading and unloading component are provided with a positioning component for calibrating the loading position.

[0005] Preferably, when in use, the servo transmission assembly is turned on to move the loading and unloading assembly, the loading and unloading assembly is turned on to adsorb the sub-parts stacked on the supporting assembly and move them upward, the servo transmission assembly is turned on to adjust the loading and unloading assembly so that the loading and unloading assembly moves in the front and rear directions, the positioning assembly is turned on to achieve positioning, and the servo transmission assembly is turned off at this time to stop the loading and unloading assembly at a specific position, and the loading and unloading assembly is turned on again to quickly and stably place the sub-parts in the tooling assembly, and the support assembly and the external welding machine are turned on to quickly weld the two sub-parts limitedly placed on the tooling assembly, thereby solving the problem of the three-way catalytic converter components of the exhaust system of commercial engines in the prior art, which are usually difficult to quickly position and load the sub-parts, difficult to quickly weld two sub-parts together, and difficult to make the arc contour of the parts match the tolerance when welding the two sub-parts, thereby improving product quality.

[0006] Preferably, the support assembly includes a base plate, a first U-shaped block, a limit block, a first screw groove, a positioning block, a second screw groove and a first threaded column; the first U-shaped block is fixedly connected to the upper end of the base plate; a symmetrical limit block is fixedly connected to the upper left edge of the first U-shaped block; a symmetrical first screw groove is fixedly opened at the upper right edge of the first U-shaped block; a positioning block is movably arranged at the upper right edge of the first U-shaped block; symmetrical second screw grooves are penetrated at the upper and lower ends of the positioning block; the inner wall of the second screw groove is threadedly installed with a first threaded column; the first threaded column passes through the second screw groove and is threadedly installed on the inner wall of the first screw groove; the upper part of the first threaded column is a smooth structure, the positioning block is placed at the upper right edge of the first U-shaped block, the first threaded column passes through the second screw groove and is threadedly installed on the inner wall of the first screw groove, the positioning block can be fixed on the first U-shaped block, and the first U-shaped block and the limit block can be used to limit the tooling assembly, thereby realizing the limited placement of the tooling assembly.

[0007] Preferably, the tooling assembly includes a carrier, a copper contact, a limit plate, a third screw groove and a second threaded column; the upper end of the first U-shaped block is movably provided with the carrier; the right end of the carrier and the left end of the positioning block are fitted together; three copper contacts are fixedly connected to the upper end of the carrier; the left end of the carrier is fixedly connected to the limit plate; the upper end of the limit plate is higher than the upper end of the carrier; two third screw grooves are fixedly provided on the upper end of the carrier; the inner wall of the third screw groove is threadedly installed with a second threaded column; the upper part of the second threaded column has a smooth structure; the left end of the limit plate and the right end of the limit block are fitted together, and the carrier is placed on the upper end of the first U-shaped block so that the left end of the limit plate and the right end of the limit block are fitted together, so that the right end of the carrier and the left end of the positioning block are fitted together, so that the carrier and the limit plate can be stably placed, and then the second threaded column is threadedly installed on the inner wall of the third screw groove, and the second threaded column can limit the sub-parts, which is conducive to the rapid and stable placement of the sub-parts.

[0008] Preferably, the bearing assembly includes a bearing platform, a limiting column, a sub-part and a limiting hole; the upper end of the base plate is fixedly connected to the bearing platform; two limiting columns are fixedly connected to the upper end of the bearing platform; sub-parts are stacked on the upper end of the bearing platform; two limiting holes are provided through the upper and lower ends of the sub-parts; the inner wall of the limiting hole fits with the outer wall of the limiting column, and the sub-parts can be stacked on the outer walls of the two limiting columns, so that the sub-parts can be quickly stacked and placed, facilitating the loading work.

[0009] Preferably, the servo transmission assembly includes a limit slot, a screw nut, a slider, a bearing seat, a fixed seat, a servo motor, a screw body and a fixed plate; the upper and lower ends of the bearing platform are penetrated by a limit slot; the upper end of the bearing platform is fixedly connected to the bearing seat and the fixed seat; the front end of the fixed seat is fixedly connected to the servo motor; the rear end of the output shaft of the servo motor passes through the fixed seat and is fixedly connected to the screw body. Two screw nuts are movably mounted on the outer wall of the screw body; the upper end of the screw nut is fixedly connected to the fixed plate; the lower end of the screw nut is fixedly connected to the slider; the left and right ends of the slider are in contact with the left and right inner walls of the limit slot; the rear end outer wall of the screw body is in contact with the inner wall of the bearing seat. When the fixed plate needs to be moved, the servo motor is turned on to rotate the screw body, and the two screw nuts move in the front-to-back direction along the outer wall of the screw body, which can drive the fixed plate to move in the front-to-back direction.

[0010] Preferably, the loading and unloading components include a support block, a fixed frame, a first electric cylinder, a second U-shaped block, a connecting block, a second electric cylinder and a vacuum suction cup; a symmetrical support block is fixedly connected to the upper end of the fixed plate; a fixed frame is fixedly connected to the upper end of the support block; a first electric cylinder is fixedly connected to the lower end of the fixed frame; a connecting block is fixedly connected to the right end of the telescopic rod of the first electric cylinder; a second U-shaped block is fixedly connected to the front and rear ends of the connecting block; the inner wall of the second U-shaped block is fitted with the upper and lower ends of the fixed frame; a symmetrical second electric cylinder is fixedly connected to the upper end of the second U-shaped block; the lower end of the telescopic rod of the second electric cylinder passes through the connecting block and is fixedly connected to the vacuum suction cup; turning on the first electric cylinder can move the connecting block in the left and right directions, and turning on the second electric cylinder can move the vacuum suction cup up and down, so that the sub-parts placed on the upper end of the carrier platform can be adsorbed by the vacuum suction cup and then moved to the designated position and put down.

[0011] Preferably, the positioning assembly includes a sensing grating and a receiving grating; the sensing grating is installed on the upper end of the carrier table by bolts; the receiving grating is installed on the lower end of the fixed frame by bolts; the sensing grating and the receiving grating are adapted to each other, and according to the position where the sub-parts need to be placed in the end, the sensing grating is installed at a suitable position on the carrier table by bolts, and the receiving grating is installed at a suitable position on the fixed frame by bolts, so that the sensing grating and the receiving grating are paired, so that when the fixed frame moves back and forth, the sensing grating and the receiving grating are paired, and the servo motor is turned off to stop the fixed frame from moving, so that the sub-parts adsorbed by the loading and unloading assembly can be stably placed on the tooling assembly.

[0012] Beneficial effects of the utility model:

[0013] 1. When in use, turn on the servo transmission component to move the loading and unloading component, turn on the loading and unloading component to adsorb the sub-parts stacked on the carrier component and move them upward, then turn on the servo transmission component to adjust the loading and unloading component, so that the loading and unloading component moves in the front and rear directions, turn on the positioning component to achieve positioning, then turn off the servo transmission component to stop the loading and unloading component at a specific position, and turn on the loading and unloading component again to quickly and stably place the sub-parts in the tooling component, solving the problem of the difficulty in quickly positioning and loading the sub-parts;

[0014] 2. Place the positioning block at the right edge of the upper end of the first U-shaped block, and pass the first threaded column through the second screw groove and threadably install it on the inner wall of the first screw groove, so that the positioning block can be fixed on the first U-shaped block. The first U-shaped block and the limit block can be used to limit the tooling assembly to achieve limited placement of the tooling assembly, and the carrier is placed on the upper end of the first U-shaped block so that the left end of the limit plate and the right end of the limit block are in contact with each other, so that the right end of the carrier and the left end of the positioning block are in contact with each other, so that the carrier and the limit plate can be stably placed, and then the second threaded column is threadably installed on the inner wall of the third screw groove, and the second threaded column can limit the sub-parts, which is conducive to the rapid and stable placement of the sub-parts, thereby facilitating the stable welding of the two sub-parts;

[0015] 3. According to the final position where the sub-parts need to be placed, install the sensing grating at the appropriate position on the carrier table through bolts, and install the receiving grating at the appropriate position on the fixed frame through bolts, so that the sensing grating and the receiving grating are paired. In this way, when the fixed frame moves back and forth, the sensing grating and the receiving grating are paired, and the servo motor is turned off to stop the fixed frame from moving, so that the sub-parts adsorbed by the loading and unloading components can be stably placed on the tooling assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a three-dimensional structural schematic diagram of a three-point welding tooling for cold stamping parts of a three-way catalytic converter of the utility model;

[0017] Figure 2 The diagram shows a three-dimensional disassembled structure of a support assembly and a tool assembly of a three-point welding tool for cold stamping parts of a three-way catalytic converter of the utility model;

[0018] Figure 3 Shown is a three-dimensional structural schematic diagram of a bearing assembly of a three-point welding tooling for cold stamping parts of a three-way catalytic converter of the utility model;

[0019] Figure 4 The three-dimensional structure schematic diagram of the servo drive assembly of the three-point welding tooling for cold stamping parts of the three-way catalytic converter of the utility model is shown;

[0020] Figure 5The three-dimensional structure schematic diagram of the loading and unloading assembly of the three-point welding tooling for cold stamping parts of the three-way catalytic converter of the utility model is shown;

[0021] Figure 6 Shown is a three-dimensional structural schematic diagram of a positioning assembly of a three-point welding tool for cold stamping parts of a three-way catalytic converter of the utility model.

[0022] The markings in the attached drawings are: 1-support assembly, 101-bottom plate, 102-first U-shaped block, 103-limiting block, 104-first screw groove, 105-positioning block, 106-second screw groove, 107-first threaded column, 2-tooling assembly, 201-carrying body, 202-copper contact, 203-limiting plate, 204-third screw groove, 205-second threaded column, 3-carrying assembly, 301-carrying platform, 302-limiting column, 303-sub-part, 304-limiting hole, 4-servo Servo transmission assembly, 401-limiting groove, 402-screw nut, 403-slider, 404-bearing seat, 405-fixed seat, 406-servo motor, 407-screw body, 408-fixed plate, 5-loading and unloading assembly, 501-support block, 502-fixed frame, 503-first electric cylinder, 504-second U-shaped block, 505-connecting block, 506-second electric cylinder, 507-vacuum suction cup, 6-positioning assembly, 601-sensing grating, 602-receiving grating. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] See also Figure 1 The utility model provides an embodiment: a three-point welding tool for cold stamping parts of a three-way catalytic converter, including a support component 1; also including a tooling component 2, a bearing component 3, a servo transmission component 4, a loading and unloading component 5 and a positioning component 6; the tooling component 2 is arranged on the upper end of the support component 1; the bearing component 3 is arranged on the upper end of the support component 1; the servo transmission component 4 is arranged on the bearing component 3; the servo transmission component 4 is arranged on the loading and unloading component 5 for loading and unloading parts; the servo transmission component 4 and the loading and unloading component 5 are provided with a positioning component 6 for calibrating the loading position.

[0025] See also Figure 2In this embodiment, the support assembly 1 includes a bottom plate 101, a first U-shaped block 102, a limiting block 103, a first screw groove 104, a positioning block 105, a second screw groove 106 and a first threaded column 107; the first U-shaped block 102 is fixedly connected to the upper end of the bottom plate 101; a symmetrical limiting block 103 is fixedly connected to the upper left edge of the first U-shaped block 102; a symmetrical first screw groove 104 is fixedly opened at the upper right edge of the first U-shaped block 102; a positioning block 105 is movably provided at the upper right edge of the first U-shaped block 102; symmetrical second screw grooves 106 are opened through the upper and lower ends of the positioning block 105; the inner wall of the second screw groove 106 is threadedly installed with a first threaded column 107; the first threaded column 107 passes through the second screw groove 106 and is threadedly installed on the inner wall of the first screw groove 104 ; The upper part of the first threaded column 107 is a smooth structure, and the tooling assembly 2 includes a carrier 201, a copper contact 202, a limiting plate 203, a third screw groove 204 and a second threaded column 205; the upper end of the first U-shaped block 102 is movably provided with a carrier 201; the right end of the carrier 201 and the left end of the positioning block 105 are in contact with each other; three copper contacts 202 are fixedly connected to the upper end of the carrier 201; the left end of the carrier 201 is fixedly connected to the limiting plate 203; the upper end of the limiting plate 203 is higher than the upper end of the carrier 201; two third screw grooves 204 are fixedly provided at the upper end of the carrier 201; the inner wall of the third screw groove 204 is threadedly installed with a second threaded column 205; the upper part of the second threaded column 205 is a smooth structure; the left end of the limiting plate 203 and the right end of the limiting block 103 are in contact with each other.

[0026] See also Figure 3 In this embodiment, the bearing assembly 3 includes a bearing platform 301, a limiting column 302, a sub-part 303 and a limiting hole 304; the upper end of the base plate 101 is fixedly connected to the bearing platform 301; two limiting columns 302 are fixedly connected to the upper end of the bearing platform 301; sub-parts 303 are stacked and placed on the upper end of the bearing platform 301; two limiting holes 304 are formed through the upper and lower ends of the sub-part 303; the inner wall of the limiting hole 304 is in contact with the outer wall of the limiting column 302.

[0027] See also Figure 4In this embodiment, the servo transmission assembly 4 includes a limiting groove 401, a screw nut 402, a slider 403, a bearing seat 404, a fixing seat 405, a servo motor 406, a screw body 407 and a fixing plate 408; the upper and lower ends of the bearing platform 301 are penetrated by a limiting groove 401; the upper end of the bearing platform 301 is fixedly connected with a bearing seat 404 and a fixing seat 405; the front end of the fixing seat 405 is fixedly connected with a servo motor 406; the rear end of the output shaft of the servo motor 406 penetrates the fixing seat 405 and is fixedly connected with a screw body 407. Two screw nuts 402 are movably installed on the outer wall of the screw body 407; the upper end of the screw nut 402 is fixedly connected with a fixing plate 408; the lower end of the screw nut 402 is fixedly connected with a slider 403; the left and right ends of the slider 403 are in contact with the left and right inner walls of the limiting groove 401; the rear end outer wall of the screw body 407 is in contact with the inner wall of the bearing seat 404.

[0028] See also Figure 5 In this embodiment, the loading and unloading assembly 5 includes a support block 501, a fixed frame 502, a first electric cylinder 503, a second U-shaped block 504, a connecting block 505, a second electric cylinder 506 and a vacuum suction cup 507; the upper end of the fixed plate 408 is fixedly connected to a symmetrical support block 501; the upper end of the support block 501 is fixedly connected to the fixed frame 502; the lower end of the fixed frame 502 is fixedly connected to the first electric cylinder 503; the right end of the telescopic rod of the first electric cylinder 503 is fixedly connected to the connecting block 505; the front and rear ends of the connecting block 505 are fixedly connected to the second U-shaped block 504; the inner wall of the second U-shaped block 504 is in contact with the upper and lower ends of the fixed frame 502; the upper end of the second U-shaped block 504 is fixedly connected to a symmetrical second electric cylinder 506; the lower end of the telescopic rod of the second electric cylinder 506 passes through the connecting block 505 and is fixedly connected to the vacuum suction cup 507.

[0029] See also Figure 6 In this embodiment, the positioning component 6 includes a sensing grating 601 and a receiving grating 602; the upper end of the carrier platform 301 is installed with the sensing grating 601 by bolts; the lower end of the fixed frame 502 is installed with the receiving grating 602 by bolts; the sensing grating 601 and the receiving grating 602 are adapted to each other.

[0030] When working, the positioning block 105 is placed at the upper right edge of the first U-shaped block 102, and the first threaded column 107 is threadedly installed on the inner wall of the first threaded groove 104 through the second threaded groove 106, so that the positioning block 105 can be fixed on the first U-shaped block 102, and the carrier 201 is placed on the upper end of the first U-shaped block 102, so that the left end of the limiting plate 203 and the right end of the limiting block 103 are in contact with each other, so that the right end of the carrier 201 and the left end of the positioning block 105 are in contact with each other, so that the carrier 201 and the limiting plate 203 can be stably placed, and then the second threaded column 205 is threadedly installed on the inner wall of the third threaded groove 204, and the second threaded column 205 can limit the sub-part 303;

[0031] The sub-parts 303 are stacked and placed on the outer walls of the two limit columns 302. Then, the servo motor 406 is turned on to rotate the screw body 407. The two screw nuts 402 move in the front-to-back direction along the outer wall of the screw body 407, driving the fixing plate 408 to move in the front-to-back direction. The first electric cylinder 503 is turned on to move the connecting block 505 in the left-right direction. The second electric cylinder 506 is turned on to move the vacuum suction cup 507 up and down, so that the sub-parts 303 placed on the upper end of the carrier 301 can be sucked by the vacuum suction cup 507 and then moved to the designated position and put down.

[0032] According to the final position where the sub-part 303 needs to be placed, the sensing grating 601 is installed at a suitable position on the carrier 301 by bolts, and the receiving grating 602 is installed at a suitable position on the fixed frame 502 by bolts, so that the sensing grating 601 and the receiving grating 602 are matched. In this way, when the fixed frame 502 moves back and forth, the sensing grating 601 and the receiving grating 602 are matched, and the servo motor 406 is turned off to stop the fixed frame 502 from moving. The sub-part 303 adsorbed by the loading and unloading assembly 5 can be stably placed on the carrier 201, so that the lower end of the sub-part 303 is in contact with the three copper contacts 202, and the three copper contacts 202 are energized. In cooperation with external welding, the three welding points can be welded at the same time.

[0033] Through the above steps, when in use, the servo transmission component 4 is turned on to move the loading and unloading component 5, the loading and unloading component 5 is turned on to absorb the sub-parts 303 stacked on the supporting component 3 and move them upward, and then the servo transmission component 4 is turned on to adjust the loading and unloading component 5 so that the loading and unloading component 5 moves in the front and rear directions, and the positioning component 6 is turned on to achieve positioning, and at this time, the servo transmission component 4 is turned off to stop the loading and unloading component 5 at a specific position, and the loading and unloading component 5 is turned on again to quickly and stably place the sub-part 303 in the tooling component 2, and the support component 1 and the external welding machine are turned on to quickly weld the two sub-parts 303 limitedly placed on the tooling component 2, which solves the problem that it is usually difficult to quickly position and load the sub-parts 303 for the three-way catalytic converter components of the exhaust system of the commercial engine in the prior art, and it is difficult to quickly weld the two sub-parts 303 together, and it is difficult to make the arc contour of the parts match the tolerance when welding the two sub-parts 303, and it is difficult to improve the product quality.

[0034] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A three-point welding tool for cold stamping parts of a three-way catalytic converter, comprising a support assembly (1); characterized in that: The invention also comprises a tooling assembly (2), a bearing assembly (3), a servo drive assembly (4), a loading and unloading assembly (5) and a positioning assembly (6); the tooling assembly (2) is arranged at the upper end of the support assembly (1); the bearing assembly (3) is arranged at the upper end of the support assembly (1); the servo drive assembly (4) is arranged on the bearing assembly (3); the loading and unloading assembly (5) for loading and unloading parts is arranged on the servo drive assembly (4); and the positioning assembly (6) for calibrating the loading position is arranged on the servo drive assembly (4) and the loading and unloading assembly (5).

2. The three-point welding tool for cold stamping parts of a three-way catalytic converter according to claim 1, characterized in that: The support assembly (1) comprises a bottom plate (101), a first U-shaped block (102), a stop block (103), a first screw groove (104), a positioning block (105), a second screw groove (106) and a first threaded column (107); the first U-shaped block (102) is fixedly connected to the upper end of the bottom plate (101); a symmetrical stop block (103) is fixedly connected to the left edge of the upper end of the first U-shaped block (102); a symmetrical stop block (103) is fixedly opened at the right edge of the upper end of the first U-shaped block (102) The first U-shaped block (102) is provided with a first screw groove (104); a positioning block (105) is movably provided at the right edge of the upper end of the first U-shaped block (102); symmetrical second screw grooves (106) are provided through the upper and lower ends of the positioning block (105); a first threaded column (107) is threadedly installed on the inner wall of the second screw groove (106); the first threaded column (107) passes through the second screw groove (106) and is threadedly installed on the inner wall of the first screw groove (104); and the upper part of the first threaded column (107) is a smooth structure.

3. The three-point welding tool for cold stamping parts of a three-way catalytic converter according to claim 2, characterized in that: The tooling assembly (2) comprises a carrier (201), a copper contact (202), a limiting plate (203), a third screw groove (204) and a second threaded column (205); the upper end of the first U-shaped block (102) is movably provided with the carrier (201); the right end of the carrier (201) and the left end of the positioning block (105) are in contact with each other; the upper end of the carrier (201) is fixedly connected with three copper contacts (202); the left end of the carrier (201) is fixedly connected with the limiting plate (203); the upper end of the limiting plate (203) is higher than the upper end of the carrier (201); the upper end of the carrier (201) is fixedly provided with two third screw grooves (204); the inner wall of the third screw groove (204) is threadedly mounted with a second threaded column (205); the upper part of the second threaded column (205) is in a smooth structure; the left end of the limiting plate (203) and the right end of the limiting block (103) are in contact with each other.

4. The three-point welding tool for cold stamping parts of a three-way catalytic converter according to claim 2, characterized in that: The bearing assembly (3) comprises a bearing platform (301), a limiting column (302), a sub-component (303) and a limiting hole (304); the upper end of the bottom plate (101) is fixedly connected to the bearing platform (301); the upper end of the bearing platform (301) is fixedly connected to two limiting columns (302); the upper end of the bearing platform (301) is stacked with sub-components (303); the upper and lower ends of the sub-component (303) are penetrated by two limiting holes (304); the inner wall of the limiting hole (304) and the outer wall of the limiting column (302) are in contact with each other.

5. The three-point welding tool for cold stamping parts of a three-way catalytic converter according to claim 4, characterized in that: The servo transmission assembly (4) comprises a limiting groove (401), a screw nut (402), a slider (403), a bearing seat (404), a fixing seat (405), a servo motor (406), a screw body (407) and a fixing plate (408); the limiting groove (401) is provided through the upper and lower ends of the bearing platform (301); the upper end of the bearing platform (301) is fixedly connected to the bearing seat (404) and the fixing seat (405); the front end of the fixing seat (405) is fixedly connected to the servo motor (406); the servo motor The rear end of the output shaft (406) passes through the fixed seat (405) and is fixedly connected to a screw body (407). Two screw nuts (402) are movably mounted on the outer wall of the screw body (407); the upper end of the screw nut (402) is fixedly connected to a fixed plate (408); the lower end of the screw nut (402) is fixedly connected to a slider (403); the left and right ends of the slider (403) are in contact with the left and right inner walls of the limiting groove (401); and the rear end outer wall of the screw body (407) is in contact with the inner wall of the bearing seat (404).

6. The three-point welding tool for cold stamping parts of a three-way catalytic converter according to claim 5, characterized in that: The loading and unloading assembly (5) comprises a support block (501), a fixing frame (502), a first electric cylinder (503), a second U-shaped block (504), a connecting block (505), a second electric cylinder (506) and a vacuum suction cup (507); the upper end of the fixing plate (408) is fixedly connected to a symmetrical support block (501); the upper end of the support block (501) is fixedly connected to the fixing frame (502); the lower end of the fixing frame (502) is fixedly connected to the first electric cylinder (503); The right end of the telescopic rod of an electric cylinder (503) is fixedly connected to a connecting block (505); the front and rear ends of the connecting block (505) are fixedly connected to a second U-shaped block (504); the inner wall of the second U-shaped block (504) fits with the upper and lower ends of the fixed frame (502); the upper end of the second U-shaped block (504) is fixedly connected to a symmetrical second electric cylinder (506); the lower end of the telescopic rod of the second electric cylinder (506) passes through the connecting block (505) and is fixedly connected to a vacuum suction cup (507).

7. The three-point welding tool for cold stamping parts of a three-way catalytic converter according to claim 4, characterized in that: The positioning component (6) comprises a sensing grating (601) and a receiving grating (602); the sensing grating (601) is mounted on the upper end of the support platform (301) via bolts; the receiving grating (602) is mounted on the lower end of the fixing frame (502) via bolts; the sensing grating (601) and the receiving grating (602) are adapted to each other.

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