A welding fixture for sheet metal parts

Abstract

The present invention is applicable to the field of welding technology and provides a sheet metal parts welding fixture, comprising: a workbench and a translation plate slidably mounted on the workbench, and an electric guide rail a is provided in the workbench for driving the translation plate to move; a first positioning mechanism for clamping truncated cone-shaped sheet metal parts, the first positioning mechanism comprising a support ring, a stand, a positioning frame and a guide wheel; and a second positioning mechanism, the second positioning mechanism being arranged on the translation plate. The present invention avoids the problem that most existing fixtures have a simple structure, are not convenient for clamping truncated cone-shaped sheet metal parts, are prone to inaccurate positioning, and seriously affect the production quality of the product through the coordinated arrangement of the first positioning mechanism, the fixing mechanism and the second positioning mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to a welding fixture for sheet metal parts. Background Art

[0002] Sheet metal parts are manufactured through a comprehensive cold working process on thin metal sheets (typically less than 6mm). Their notable characteristic is their consistent thickness across the entire part. In modern manufacturing, sheet metal parts are widely used in a variety of fields, including automotive, aviation, and electronics. During sheet metal processing, it is often necessary to weld one sheet metal part to another. For example, when welding a frustum-shaped sheet metal part, a circular sheet metal part must be welded to one end of the frustum to meet processing requirements.

[0003] Most existing fixtures have simple structures, making them inconvenient for clamping truncated cone-shaped sheet metal parts. This can easily lead to inaccurate positioning, which seriously affects product quality. Therefore, in response to the above situation, there is an urgent need to provide a sheet metal parts welding fixture to overcome the shortcomings of current practical applications. Summary of the Invention

[0004] The purpose of the present invention is to provide a sheet metal parts welding fixture, aiming to solve the problems in the above-mentioned background technology.

[0005] The present invention is achieved in this way: a sheet metal parts welding fixture, comprising:

[0006] A workbench and a translation plate slidably mounted on the workbench, wherein an electric guide rail a is provided in the workbench for driving the translation plate to move;

[0007] A first positioning mechanism for clamping a truncated cone-shaped sheet metal part, the first positioning mechanism comprising a support ring, a stand, a positioning frame and a guide wheel, the support ring being rotatably mounted on a workbench, and a driving assembly for driving the support ring to rotate is provided on the workbench, the stand is fixedly mounted with multiple groups of equal-spaced groups on the support ring, and a rotating shaft is also rotatably mounted on the stand, the positioning frame is fixedly mounted on the rotating shaft, the guide wheel is rotatably mounted on the positioning frame, and two groups of guide wheels are symmetrically arranged on the positioning frame, a locking assembly for restricting the truncated cone-shaped sheet metal part is further provided in the positioning frame, and a reset assembly for supporting the positioning frame is provided on the stand;

[0008] A fixing mechanism for cooperating with the first positioning mechanism to fix the truncated cone-shaped sheet metal part, wherein the fixing mechanism is arranged on the workbench;

[0009] and a second positioning mechanism for fixing a workpiece to be connected to the frustum-shaped sheet metal part, wherein the second positioning mechanism is arranged on the translation plate.

[0010] As a further solution of the present invention: the locking assembly includes:

[0011] Cavity a and cavity b are provided in the positioning frame, wherein piston plates a and b are slidably mounted in the cavities a and b, respectively, and two groups of cavities a are symmetrically arranged in the positioning frame;

[0012] Springs a and springs b for elastically supporting piston plates a and b, respectively, wherein springs a and springs b are disposed in cavities a and b, respectively;

[0013] A locking block for pressing the guide wheel, wherein the locking block is connected to the piston plate a via a push rod a, and a through hole a is provided on the positioning frame for the push rod a to pass through;

[0014] A positioning bar for pressing the truncated cone-shaped sheet metal part, wherein the positioning bar is connected to the piston plate b via a push rod b, and a through hole b is provided on the positioning frame for the push rod b to pass through;

[0015] and a pneumatic component for inputting gas into cavity a and cavity b.

[0016] As a further solution of the present invention: the pneumatic component includes:

[0017] A shunt pipe, one end of which is in communication with cavity a and cavity b respectively, and a rotating shaft for being mounted on the positioning frame has an air guide channel in communication with the other end of the shunt pipe;

[0018] A vertical plate fixedly mounted on the workbench, wherein an air guide pipe b is provided on the vertical plate;

[0019] An air guide component is used to connect the air guide pipe b and the rotating shaft.

[0020] As a further solution of the present invention: the air guide component includes:

[0021] An air guide ring fixedly mounted on the stand, with an annular side plate rotatably mounted on the side of the air guide ring, and a circular hole connected to the air guide pipe b is opened on the annular side plate, and a closed air guide cavity is formed between the annular side plate and the air guide ring;

[0022] An air guide tube c, one end of which is connected to the air guide cavity, and the other end of which is provided with an air guide block connected to the air guide channel in the rotating shaft, and the air guide block is rotatably connected to the rotating shaft.

[0023] As a further solution of the present invention: the reset component includes:

[0024] A support rod, wherein the support rod is fixedly mounted on the stand;

[0025] And an elastic plate for elastically supporting the positioning frame, wherein the elastic plate is fixedly installed on the support rod and has an eight-shaped structure.

[0026] As a further solution of the present invention: the drive assembly includes:

[0027] An external gear, the external gear being fixedly mounted on the bottom of the support ring;

[0028] A motor is fixedly mounted on a workbench, and a driving gear meshing with an external gear is fixedly mounted on an output shaft of the motor.

[0029] As a further solution of the present invention: the fixing mechanism includes:

[0030] a lifting box located below the first positioning mechanism, wherein the lifting box is slidably mounted on the workbench;

[0031] The threaded rod installed at the bottom of the workbench is rotated, and the lifting box is provided with an internal threaded hole threadedly connected to the threaded rod, and the bottom of the workbench is also provided with a driving unit for driving the threaded rod to rotate;

[0032] Rotate a rotating block mounted on the top of the lifting box, wherein a fixed platform is fixedly mounted on the rotating block;

[0033] And positioning blocks, wherein a plurality of positioning blocks are arranged at equal intervals in the circumferential direction of the fixed platform, and an air control component for driving the positioning blocks to move is also arranged in the fixed platform.

[0034] As a further solution of the present invention: the air control component includes:

[0035] Air guide tube a, the lifting box is further provided with an air guide cavity connected to the air guide tube a, and the interior of the rotating block is hollow, and a vent hole connected to the air guide cavity is opened on the side wall of the rotating block;

[0036] Compression chambers a and b are provided in the fixed platform, and the compression chambers a and b are provided in multiple groups, and the multiple groups of compression chambers a and compression chambers b are interconnected. An air duct d is also provided in the fixed platform for inputting gas into the compression chambers a and compression chambers b, and the air duct d is also connected to the rotating block;

[0037] A piston plate c is slidably mounted in the compression chamber a, wherein the piston plate c is connected to the positioning block via a push rod c, and a spring c is further provided in the compression chamber a for elastically supporting the piston plate c;

[0038] A piston plate d is slidably mounted in the compression chamber b. A spring d is provided in the compression chamber b for elastically supporting the piston plate d. A knocking bar is also provided on the compression chamber b.

[0039] Bumps a are provided in multiple groups at the bottom of the fixing platform, and bumps b for colliding with the bumps a are also provided on the knocking bar.

[0040] As a further solution of the present invention: the elastic coefficients of the multiple groups of springs d increase successively, and the elastic coefficient of the spring c is smaller than the elastic coefficients of all the springs d.

[0041] As a further solution of the present invention: the second positioning mechanism includes:

[0042] A lifting plate slidably mounted on the translation plate, wherein the translation plate is provided with an electric guide rail b for driving the lifting plate to move;

[0043] Rotating a suction pipe mounted on the lifting plate, wherein a suction cup is provided at the bottom of the suction pipe;

[0044] A compression chamber c is provided in the positioning box, wherein the compression chamber c is provided with multiple groups, and a piston plate e is slidably installed in each group of compression chambers c, and a spring f is further provided in the compression chamber c for elastically supporting the piston plate e;

[0045] A movable plate is provided on the piston plate e, and a positioning rod is slidably mounted on the end of the movable plate, and circular plates are provided at both ends of the positioning rod. A spring e is also provided on the movable plate for pulling the circular plate at the top;

[0046] An air guide pipe e for introducing gas into the compression chamber c, wherein the air guide pipe e is arranged in the positioning box;

[0047] A locking pin for limiting the positioning rod, the locking pin is slidably installed in the movable plate through the baffle b, and a limiting hole for cooperating with the locking pin is opened at the bottom of the positioning rod;

[0048] Baffle a, the baffle a is connected to the inside of the movable plate through a spring g, and an unlocking block is also provided on the spring g, a button is fixedly installed on the end of the unlocking block, and a baffle rod for use with the unlocking block is also provided on the locking pin.

[0049] Compared with the prior art, the beneficial effects of the present invention are as follows: the large mouth of the truncated cone-shaped sheet metal part is placed upward between multiple sets of positioning frames, so that the guide wheel can contact the side wall of the truncated cone-shaped sheet metal part, so that the positioning frame can rotate with the rotating shaft as the axis, and then the two sets of guide wheels are in contact with the side of the truncated cone-shaped sheet metal part, thereby achieving the preliminary positioning of the truncated cone-shaped sheet metal part, and then the fixing component is used to enter from the small mouth end of the truncated cone-shaped sheet metal part and generate a downward pulling force on the truncated cone-shaped sheet metal part, thereby fixing the truncated cone-shaped sheet metal part between the multiple sets of positioning frames. After the fixing is completed, the truncated cone-shaped sheet metal part is fixed between the multiple sets of positioning frames. The truncated cone-shaped sheet metal part is restricted again with a locking assembly, and then the workpiece (i.e., the circular sheet metal part) that needs to be connected to the truncated cone-shaped sheet metal part is placed under the second positioning mechanism, and the workpiece is fixed with the second positioning mechanism before being moved to the large end of the truncated cone-shaped sheet metal part for easy welding. Through the coordinated arrangement of the first positioning mechanism, the fixing mechanism, and the second positioning mechanism, the problem of the simple structure of most existing fixtures, which is inconvenient for clamping truncated cone-shaped sheet metal parts and prone to inaccurate positioning, is avoided, which seriously affects the production quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of the present invention.

[0051] Figure 2 for Figure 1 Schematic diagram of the upward-looking structure.

[0052] Figure 3 It is a structural schematic diagram of the first positioning mechanism in the present invention.

[0053] Figure 4 for Figure 3 Schematic diagram of the front view cross-section structure at point A in the middle.

[0054] Figure 5 It is a schematic cross-sectional structural diagram of the air guide assembly in the present invention.

[0055] Figure 6 It is a structural schematic diagram of the fixing mechanism in the present invention.

[0056] Figure 7 It is a partial cross-sectional structural schematic diagram of the fixing mechanism in the present invention.

[0057] Figure 8 It is a schematic diagram of a top view and cross-section structure of the fixing platform in the present invention.

[0058] Figure 9 It is a structural schematic diagram of the second positioning mechanism in the present invention.

[0059] Figure 10 It is a schematic diagram of the top cross-sectional structure of the positioning box in the present invention.

[0060] Figure 11 for Figure 10 Schematic diagram of the enlarged structure at point B in the middle.

[0061] In the accompanying drawings: 1- working table, 2- translation plate, 3- lifting plate, 4- suction tube, 5- positioning box, 6- suction cup, 7- positioning frame, 8- air guide ring, 9- support ring, 10- external gear, 11- fixed table, 12- lifting box, 13- threaded rod, 14- air guide tube a, 15- motor, 16- driving gear, 17- vertical plate, 18- air guide tube b, 19- annular side plate, 20- vertical frame, 21- guide wheel, 22- positioning strip, 23- elastic plate, 24- support rod, 25- air guide tube c, 26- locking block, 27- push rod a, 28- spring a, 29- piston plate a, 30- push rod b, 31- spring b, 32- piston plate b, 3 3-air guide block, 34-manifold, 35-positioning block, 36-rotating block, 37-air guide tube d, 38-vent, 39-air guide chamber, 40-push rod c, 41-spring c, 42-compression chamber a, 43-compression chamber b, 44-spring d, 45-piston plate d, 46-knocking bar, 47-bump a, 48-bump b, 49-air guide tube e, 50-piston plate c, 51-compression chamber c, 52-positioning rod, 53-spring e, 54-button, 55-moving plate, 56-spring f, 57-piston plate e, 58-locking pin, 59-blocking rod, 60-unlocking block, 61-spring g, 62-baffle a, 63-baffle b. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The specific implementation of the present invention is described in detail below in combination with specific embodiments.

[0063] See also Figures 1-11 , an embodiment of the present invention provides a sheet metal parts welding fixture, the sheet metal parts welding fixture comprising:

[0064] A workbench 1 and a translation plate 2 slidably mounted on the workbench 1, wherein the workbench 1 is provided with an electric guide rail a for driving the translation plate 2 to move;

[0065] A first positioning mechanism for clamping a truncated cone-shaped sheet metal part, the first positioning mechanism includes a support ring 9, a stand 20, a positioning frame 7 and a guide wheel 21, the support ring 9 is rotatably mounted on the workbench 1, and the workbench 1 is provided with a driving assembly for driving the support ring 9 to rotate, the stand 20 is fixedly mounted in multiple groups at equal intervals on the support ring 9, and a rotating shaft is also rotatably mounted on the stand 20, the positioning frame 7 is fixedly mounted on the rotating shaft, the guide wheel 21 is rotatably mounted on the positioning frame 7, and two groups of guide wheels 21 are symmetrically arranged on the positioning frame 7, a locking assembly for restricting the truncated cone-shaped sheet metal part is also provided in the positioning frame 7, and a reset assembly for supporting the positioning frame 7 is provided on the stand 20;

[0066] A fixing mechanism for cooperating with the first positioning mechanism to fix the truncated cone-shaped sheet metal part, the fixing mechanism being arranged on the workbench 1;

[0067] And a second positioning mechanism for fixing the workpiece to be connected to the frustum-shaped sheet metal part, wherein the second positioning mechanism is arranged on the translation plate 2.

[0068] In an embodiment of the present invention, the clamp is preferentially suitable for the welding process of the large end of the truncated cone-shaped part; when in use, the large end of the truncated cone-shaped sheet metal part is placed upward between multiple sets of positioning frames 7, so that the guide wheel 21 can contact the side wall of the truncated cone-shaped sheet metal part, thereby allowing the positioning frame 7 to rotate with the rotating shaft as the axis, and then both sets of guide wheels 21 are in contact with the side of the truncated cone-shaped sheet metal part, thereby achieving preliminary positioning of the truncated cone-shaped sheet metal part, and then using the fixing component to enter from the small end of the truncated cone-shaped sheet metal part, and generate a downward pulling force on the truncated cone-shaped sheet metal part, thereby fixing the truncated cone-shaped sheet metal part to the multiple sets of positioning frames 7. After the fixation is completed, the locking assembly is used to restrict the truncated cone-shaped sheet metal part again, and then the workpiece to be connected to the truncated cone-shaped sheet metal part (i.e., the circular sheet metal part) is placed under the second positioning mechanism, and the workpiece is fixed by the second positioning mechanism and then moved to the large end of the truncated cone-shaped sheet metal part for welding. Compared with the existing technology, the present invention avoids the problem that most existing fixtures have simple structures, are not convenient for clamping truncated cone-shaped sheet metal parts, are prone to inaccurate positioning, and seriously affect the production quality of products through the coordinated arrangement of the first positioning mechanism, the fixing mechanism and the second positioning mechanism.

[0069] In one embodiment of the present invention, see Figures 1-11 , the locking assembly comprises:

[0070] Cavity a and cavity b are provided in the positioning frame 7, wherein piston plates a29 and b32 are slidably mounted in the cavity a and cavity b, respectively, and two groups of cavities a are symmetrically arranged in the positioning frame 7;

[0071] Springs a28 and b31 are used to elastically support piston plates a29 and b32, respectively. Springs a28 and b31 are disposed in cavities a and b, respectively.

[0072] A locking block 26 for pressing the guide wheel 21, wherein the locking block 26 is connected to the piston plate a29 via a push rod a27, and a through hole a is provided on the positioning frame 7 for the push rod a27 to pass through;

[0073] A positioning bar 22 for pressing the truncated cone-shaped sheet metal part, wherein the positioning bar 22 is connected to the piston plate b32 via a push rod b30, and a through hole b is provided on the positioning frame 7 for the push rod b30 to pass through;

[0074] and a pneumatic component for inputting gas into cavity a and cavity b;

[0075] The pneumatic assembly includes:

[0076] A shunt pipe 34, one end of which is in communication with cavity a and cavity b respectively, and a rotating shaft for mounting on the positioning frame 7 has an air guide channel in communication with the other end of the shunt pipe 34;

[0077] A vertical plate 17 fixedly mounted on the workbench 1, wherein an air guide pipe b18 is provided on the vertical plate 17;

[0078] An air guide assembly, which is used to connect the air guide pipe b18 and the rotating shaft;

[0079] The air guide assembly comprises:

[0080] An air guide ring 8 is fixedly mounted on the stand 20. An annular side plate 19 is rotatably mounted on the side of the air guide ring 8. The annular side plate 19 is provided with a circular hole connected to the air guide pipe b18. A sealed air guide cavity 39 is formed between the annular side plate 19 and the air guide ring 8.

[0081] An air guide tube c25, one end of which is connected to the air guide cavity 39, and the other end of which is provided with an air guide block 33 connected to the air guide channel in the rotating shaft, and the air guide block 33 is rotatably connected to the rotating shaft; wherein both the air guide tube c25 and the air guide tube b18 are hard tubes;

[0082] The reset component includes:

[0083] A support rod 24, wherein the support rod 24 is fixedly mounted on the stand 20;

[0084] and an elastic plate 23 for elastically supporting the positioning frame 7, wherein the elastic plate 23 is fixedly mounted on the support rod 24 and has an eight-shaped structure;

[0085] The drive assembly includes:

[0086] An external gear 10, wherein the external gear 10 is fixedly mounted on the bottom of the support ring 9;

[0087] A motor 15 is fixedly mounted on the workbench 1 , and a driving gear 16 meshing with the external gear 10 is fixedly mounted on the output shaft of the motor 15 .

[0088] In this embodiment, when in use, the air guide pipe b18 is connected to the external air source, and the gas will pass through the air guide pipe b18 into the closed air guide cavity 39 between the annular side plate 19 and the air guide ring 8, and pass through the air guide pipe c25, the elastic plate 23 and the diverter pipe 34 into the cavity a and the cavity b, thereby pushing the piston plate a29 and the piston plate b32 to move, and the push rod a27 can drive the locking block 26 to press on the guide wheel 21 to fix the guide wheel 21, and the push rod b30 can drive the positioning bar 22 to press It is pressed onto the side wall of the truncated cone-shaped sheet metal part to achieve further fixation. During welding, the supporting ring 9 can be driven to rotate by the coordinated arrangement of the motor 15, the driving gear 16 and the outer gear 10, thereby driving the truncated cone-shaped sheet metal part to rotate. The rotational connection between the annular side plate 19 and the air guide ring 8 facilitates the delivery of gas during rotation. The elastic plate 23 facilitates the maintenance of the positioning frame 7 in a vertical state for easy use. After the gas is extracted, the locking block 26 and the positioning bar 22 can be reset by using the spring a28 and the spring b31.

[0089] In one embodiment of the present invention, see Figures 1-11 , the fixing mechanism includes:

[0090] A lifting box 12 is located below the first positioning mechanism, and the lifting box 12 is slidably mounted on the workbench 1;

[0091] The threaded rod 13 is rotatably mounted on the bottom of the workbench 1. The lifting box 12 is provided with an internal threaded hole threadedly connected to the threaded rod 13. The bottom of the workbench 1 is also provided with a driving unit (not shown in the figure) for driving the threaded rod 13 to rotate. The driving unit may be a driving motor.

[0092] Rotate the rotating block 36 mounted on the top of the lifting box 12, on which the fixed platform 11 is fixedly mounted;

[0093] and positioning blocks 35, wherein the positioning blocks 35 are arranged in multiple groups at equal intervals in the circumferential direction of the fixed platform 11, and an air control component for driving the positioning blocks 35 to move is also provided in the fixed platform 11;

[0094] The air control component includes:

[0095] The air guide pipe a14, the lifting box 12 is further provided with an air guide cavity 39 connected to the air guide pipe a14, and the interior of the rotating block 36 is hollow, and a vent hole 38 connected to the air guide cavity 39 is opened on the side wall of the rotating block 36;

[0096] Compression chambers a42 and b43 are provided in the fixed platform 11. Multiple groups of compression chambers a42 and b43 are provided, and the multiple groups of compression chambers a42 and b43 are interconnected. An air duct d37 for inputting gas into the compression chambers a42 and b43 is also provided in the fixed platform 11. The air duct d37 is also connected to the rotating block 36.

[0097] A piston plate c50 is slidably mounted in the compression chamber a42. The piston plate c50 is connected to the positioning block 35 via a push rod c40. A spring c41 is also provided in the compression chamber a42 for elastically supporting the piston plate c50.

[0098] A piston plate d45 is slidably mounted in the compression chamber b43. A spring d44 is provided in the compression chamber b43 for elastically supporting the piston plate d45. A knocking bar 46 is also provided on the compression chamber b43.

[0099] Bumps a47, the bumps a47 are provided in multiple groups at the bottom of the fixed platform 11, and the knocking bar 46 is also provided with a bump b48 that collides with the bumps a47; wherein the knocking bar 46 is made of elastic material;

[0100] The elastic coefficients of the multiple groups of springs d44 increase sequentially, and the elastic coefficient of the spring c41 is smaller than the elastic coefficients of all the springs d44.

[0101] In this embodiment, the positioning blocks 35 are preferably three groups; when in use, the air guide pipe a14 is connected to the external air source, and the rotating threaded rod 13 can drive the lifting box 12 to move, thereby pushing the fixed platform 11 from the small end into the truncated cone-shaped sheet metal part, and then using the air guide pipe a14 to introduce the gas into the air guide cavity 39, the gas in the air guide cavity 39 enters the rotating block 36 through the vent 38, and enters the compression chamber a42 and the compression chamber b43 through the air guide pipe d37. Since the elastic coefficients of the multiple groups of springs d44 increase in sequence, and the elastic coefficient of the spring c41 is smaller than the elastic coefficient of all the springs d44, the piston plate c50 will move first, and the piston plate c50 and The push rod c40 can push the positioning block 35 to contact the inner wall of the truncated cone-shaped sheet metal part. After contact, the lifting box 12 is used to drive the rotating block 36 and the fixed platform 11 to move downward. At the same time, the gas will push the piston plate d45 to move in turn. The piston plate d45 drives the knocking bar 46 to move, so that the bump a47 and the bump b48 collide to generate vibration. During the vibration, the truncated cone-shaped sheet metal part is pulled down, so that the outer wall of the truncated cone-shaped sheet metal part is fully in contact with the guide wheel 21, and the inner wall of the truncated cone-shaped sheet metal part is fully in contact with the positioning block 35, thereby improving the fixing accuracy. By continuously inputting gas and driving the fixed platform 11 to move continuously downward, the truncated cone-shaped sheet metal part can be fixed.

[0102] In one embodiment of the present invention, see Figures 1-11 , the second positioning mechanism includes:

[0103] The lifting plate 3 is slidably mounted on the translation plate 2. The translation plate 2 is provided with an electric guide rail b for driving the lifting plate 3 to move. The electric guide rail b can be used to adjust the height of the lifting plate 3.

[0104] Rotate the suction pipe 4 mounted on the lifting plate 3, wherein a suction cup 6 is provided at the bottom of the suction pipe 4;

[0105] A compression chamber c51 is provided in the positioning box 5. The compression chamber c51 is provided with multiple groups, and a piston plate e57 is slidably installed in each group of compression chambers c51. A spring f56 is also provided in the compression chamber c51 for elastically supporting the piston plate e57.

[0106] A movable plate 55 is provided on the piston plate e57. A positioning rod 52 is slidably mounted on the end of the movable plate 55. Both ends of the positioning rod 52 are provided with circular plates. The movable plate 55 is also provided with a spring e53 for pulling the circular plate at the top.

[0107] An air guide pipe e49 for introducing gas into the compression chamber c51, wherein the air guide pipe e49 is disposed in the positioning box 5;

[0108] A locking pin 58 for limiting the positioning rod 52 is slidably mounted in the movable plate 55 via the baffle b63, and a limiting hole for cooperating with the locking pin 58 is provided at the bottom of the positioning rod 52;

[0109] Baffle a62, the baffle a62 is connected to the inside of the movable plate 55 through a spring g61, and an unlocking block 60 is also provided on the spring g61, a button 54 is fixedly installed on the end of the unlocking block 60, and a baffle rod 59 for cooperating with the unlocking block 60 is also provided on the locking pin 58.

[0110] In this embodiment, the compression chamber c51 is preferably three groups; when in use, the air guide tube e49 is connected to the external air source, the suction tube 4 is connected to the external negative pressure pump, and then the button 54 is pressed, so that the unlocking block 60 pushes the blocking rod 59 to drive the locking pin 58 to move toward the positioning box 5, so that the spring e53 can pull the positioning rod 52 to move downward, and after the gas enters the compression chamber c51, it will push the piston plate e57, the moving plate 55 and the compression chamber a42 to move outward, and then the workpiece is placed under the suction cup 6, and then the gas in the compression chamber c51 is extracted, and the spring f56 will push the piston plate e57 to move, so that the positioning box 5 The positioning rod 52 is pressed to the side of the workpiece to position the workpiece, so that the suction cup 6 can adsorb the center position of the workpiece. The translation plate 2 translates on the workbench 1, and the lifting plate 3 moves vertically downward on the translation plate 2, so that the workpiece is moved to the large end. At this time, gas is re-injected into the compression chamber c51 to expand the movable plate 55 and push the positioning rod 52 upward, so that the locking pin 58 re-fixes the positioning rod 52 to prevent the movable plate 55 and the positioning rod 52 from affecting the placement of the workpiece into the large end. After the workpiece is pressed into the large end by the suction cup 6, the workpiece can rotate with the conical sheet metal part, which is convenient for welding.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sheet metal parts welding fixture, comprising a workbench and a translation plate slidably mounted on the workbench, wherein an electric guide rail a is provided in the workbench for driving the translation plate to move, characterized in that: Also includes: A first positioning mechanism for clamping a truncated cone-shaped sheet metal part, the first positioning mechanism comprising a support ring, a stand, a positioning frame and a guide wheel, the support ring being rotatably mounted on a workbench, and a driving assembly for driving the support ring to rotate is provided on the workbench, the stand is fixedly mounted with multiple groups of equal-spaced groups on the support ring, and a rotating shaft is also rotatably mounted on the stand, the positioning frame is fixedly mounted on the rotating shaft, the guide wheel is rotatably mounted on the positioning frame, and two groups of guide wheels are symmetrically arranged on the positioning frame, a locking assembly for restricting the truncated cone-shaped sheet metal part is further provided in the positioning frame, and a reset assembly for supporting the positioning frame is provided on the stand; A fixing mechanism for cooperating with the first positioning mechanism to fix the truncated cone-shaped sheet metal part, wherein the fixing mechanism is arranged on the workbench; and a second positioning mechanism for fixing the workpiece to be connected to the frustum-shaped sheet metal part, wherein the second positioning mechanism is arranged on the translation plate; the fixing mechanism comprises: a lifting box located below the first positioning mechanism, wherein the lifting box is slidably mounted on the workbench; The threaded rod installed at the bottom of the workbench is rotated, and the lifting box is provided with an internal threaded hole threadedly connected to the threaded rod, and the bottom of the workbench is also provided with a driving unit for driving the threaded rod to rotate; Rotate a rotating block mounted on the top of the lifting box, wherein a fixed platform is fixedly mounted on the rotating block; and positioning blocks, wherein a plurality of positioning blocks are arranged at equal intervals in the circumferential direction of the fixed platform, and an air control component for driving the positioning blocks to move is also provided in the fixed platform; The air control component includes: Air guide tube a, the lifting box is further provided with an air guide cavity connected to the air guide tube a, and the interior of the rotating block is hollow, and a vent hole connected to the air guide cavity is opened on the side wall of the rotating block; Compression chambers a and b are provided in the fixed platform, and the compression chambers a and b are provided in multiple groups, and the multiple groups of compression chambers a and compression chambers b are interconnected. An air duct d is also provided in the fixed platform for inputting gas into the compression chambers a and compression chambers b, and the air duct d is also connected to the rotating block; A piston plate c is slidably mounted in the compression chamber a, wherein the piston plate c is connected to the positioning block via a push rod c, and a spring c is further provided in the compression chamber a for elastically supporting the piston plate c; A piston plate d is slidably mounted in the compression chamber b. A spring d is provided in the compression chamber b for elastically supporting the piston plate d. A knocking bar is also provided on the compression chamber b. Bumps a, wherein the bumps a are provided in multiple groups at the bottom of the fixed platform, and the knocking bar is further provided with bumps b for colliding with the bumps a; The elastic coefficients of the multiple groups of springs d increase sequentially, and the elastic coefficient of the spring c is smaller than the elastic coefficients of all the springs d.

2. The sheet metal parts welding fixture according to claim 1, characterized in that: The locking assembly comprises: Cavity a and cavity b are provided in the positioning frame, wherein piston plates a and b are slidably mounted in the cavities a and b, respectively, and two groups of cavities a are symmetrically arranged in the positioning frame; Springs a and springs b for elastically supporting piston plates a and b, respectively, wherein springs a and springs b are disposed in cavities a and b, respectively; A locking block for pressing the guide wheel, wherein the locking block is connected to the piston plate a via a push rod a, and a through hole a is provided on the positioning frame for the push rod a to pass through; A positioning bar for pressing the truncated cone-shaped sheet metal part, wherein the positioning bar is connected to the piston plate b via a push rod b, and a through hole b is provided on the positioning frame for the push rod b to pass through; and a pneumatic component for inputting gas into cavity a and cavity b.

3. The sheet metal parts welding fixture according to claim 2, characterized in that: The pneumatic assembly includes: A shunt pipe, one end of which is in communication with cavity a and cavity b respectively, and a rotating shaft for being mounted on the positioning frame has an air guide channel in communication with the other end of the shunt pipe; A vertical plate fixedly mounted on the workbench, wherein an air guide pipe b is provided on the vertical plate; An air guide component is used to connect the air guide pipe b and the rotating shaft.

4. The sheet metal parts welding fixture according to claim 3, characterized in that: The air guide assembly comprises: An air guide ring fixedly mounted on the stand, with an annular side plate rotatably mounted on the side of the air guide ring, and a circular hole connected to the air guide pipe b is opened on the annular side plate, and a closed air guide cavity is formed between the annular side plate and the air guide ring; An air guide tube c, one end of which is connected to the air guide cavity, and the other end of which is provided with an air guide block connected to the air guide channel in the rotating shaft, and the air guide block is rotatably connected to the rotating shaft.

5. The sheet metal parts welding fixture according to claim 1, characterized in that: The reset component includes: A support rod, wherein the support rod is fixedly mounted on the stand; And an elastic plate for elastically supporting the positioning frame, wherein the elastic plate is fixedly installed on the support rod and has an eight-shaped structure.

6. The sheet metal parts welding fixture according to claim 1, characterized in that: The drive assembly includes: An external gear, the external gear being fixedly mounted on the bottom of the support ring; A motor is fixedly mounted on a workbench, and a driving gear meshing with an external gear is fixedly mounted on an output shaft of the motor.

7. The sheet metal parts welding fixture according to claim 1, characterized in that: The second positioning mechanism includes: A lifting plate slidably mounted on the translation plate, wherein the translation plate is provided with an electric guide rail b for driving the lifting plate to move; Rotating a suction pipe mounted on the lifting plate, wherein a suction cup is provided at the bottom of the suction pipe; A compression chamber c is provided in the positioning box, wherein the compression chamber c is provided with multiple groups, and a piston plate e is slidably installed in each group of compression chambers c, and a spring f is further provided in the compression chamber c for elastically supporting the piston plate e; A movable plate is provided on the piston plate e, and a positioning rod is slidably mounted on the end of the movable plate, and circular plates are provided at both ends of the positioning rod. A spring e is also provided on the movable plate for pulling the circular plate at the top; An air guide pipe e for introducing gas into the compression chamber c, wherein the air guide pipe e is arranged in the positioning box; A locking pin for limiting the positioning rod, the locking pin is slidably installed in the movable plate through the baffle b, and a limiting hole for cooperating with the locking pin is opened at the bottom of the positioning rod; Baffle a, the baffle a is connected to the inside of the movable plate through a spring g, and an unlocking block is also provided on the spring g, a button is fixedly installed on the end of the unlocking block, and a baffle rod for use with the unlocking block is also provided on the locking pin.

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