Automobile sheet metal clamping workbench

Abstract

The present invention discloses an automobile sheet metal clamping workbench, which belongs to the field of automobile sheet metal processing technology. At least two positioning pins are arranged below two opposite corners of the sheet metal, and the two positioning pins are axially inserted into two circular holes on the sheet metal respectively. The clamping part and the positioning pin are both installed on a bracket, and the bracket is hinged to the top end of a driving arm through a swinging component that swings back and forth, and the driving arm can rotate around the vertical axis; the bottom of the groove of the door frame has a raised semi-cylindrical semi-cylindrical body, and the right end face of the semi-cylindrical body is an inclined surface inclined to the upper right; the top end of the driving arm has an integrally formed rectangular block and a frustum body, the top surface of the rectangular block is a semi-cylindrical chamfered surface, and the frustum body has a coaxially arranged arc-shaped limiting step on one end surface of the rectangular block. The present invention can quickly and reliably clamp and position automobile sheet metal parts, and flexibly swing to adapt to welding operations.

Description

Technical Field

[0001] The invention relates to the technical field of automobile sheet metal processing, in particular to an automobile sheet metal clamping workbench. Background Art

[0002] Automotive sheet metal parts are an indispensable part of automobile manufacturing. They mainly refer to metal sheet parts that are formed through stamping, bending, welding, cutting and other processes. These parts cover most of the exterior and part of the interior structure of the car. They not only affect the exterior design of the car, but also play an important role in protecting passenger safety, supporting the body structure, and reducing the weight of the car. The processing of automotive sheet metal usually includes stamping, riveting and welding. Generally, the steel plate is stamped into shape first, and then the corresponding sheet metal parts are riveted or welded, or riveted first and then welded to assemble into components. Figure 1 The automobile sheet metal part shown mainly includes a sheet metal main board 1, a longitudinal beam 3 installed at the bottom of the sheet metal main board 1, and a channel steel plate 2 with a channel steel structure similar to that installed on both sides of the sheet metal main board 1. The longitudinal beam 3 and the sheet metal main board 1 have a plurality of circular holes, and the longitudinal beam 3 and the channel steel plate 2 are fixed to the sheet metal main board 1 by riveting to form a preassembled body. The positions of each other are determined, and then the robot welding technology is used for welding, and the corresponding parts are finally welded and fixed. During the welding or further assembly process, the preassembled body needs to be swung and rotated to move to the predetermined operating station for welding or assembly, so as to finally obtain the required automobile sheet metal part. In the prior art, the clamping of such sheet metal parts for automobiles is usually done by passing bolts through corresponding circular holes for fixing. Although this fixing and clamping method is simple, it is relatively cumbersome, very primitive in technology, and difficult to automate. Therefore, the clamping and positioning efficiency is extremely low. Moreover, the circular holes for clamping are all on the sheet metal main board 1. Therefore, the clamping force is mainly applied to the sheet metal main board 1, while the channel steel plate 2 on its side is not directly clamped, which is very easy to loosen during subsequent processing and affect the final welding or subsequent assembly of the entire component. In addition, the most prominent problem is that after the automobile sheet metal parts are pre-riveted and assembled, they need to be moved to the established workstation. At present, the workshop generally directly uses a robot to grab them and then transfer them to the corresponding workstation for clamping again. This results in multiple clamping, and the entire part cannot be moved to the corresponding workstation for subsequent processing after being clamped and positioned once, which not only affects efficiency but also affects accuracy. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an automobile sheet metal clamping workbench, which can quickly and reliably clamp and position the above-mentioned automobile sheet metal parts, and realize the swing and rotation of the automobile sheet metal parts with a flexible and simple driving structure.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automobile sheet metal clamping workbench, mainly comprising a plurality of clamping parts for clamping the edges of the sheet metal parts, and a supporting part for supporting the sheet metal parts, wherein the clamping parts are provided in plurality and are arranged at the edges of the four sides of the sheet metal parts respectively, and at least two of the clamping parts are used for clamping the lower side walls of the channel steel plates on the left and right sides of the sheet metal main board; at least two locating pins are provided below the two opposite corners of the sheet metal parts, and the two locating pins are respectively axially inserted into two circular holes on the sheet metal parts. At the same time, the clamping part and the positioning pin are both installed on a bracket, and the bracket is hinged to the top end of a driving arm through a swinging component that swings back and forth, and the driving arm can rotate around a vertical axis; the swinging component includes a door frame that is roughly Π-shaped and has a groove, and the bottom of the groove of the door frame has a raised semi-cylindrical body in the shape of a half cylinder, and the right end face of the semi-cylinder is an inclined surface inclined to the upper right; the top end of the driving arm has a hinged part rotatably installed in the groove, and the hinged part includes a hinge from left to right The right side is arranged in sequence, an integrally formed rectangular block and a truncated cone body, the top surface of the rectangular block is a semi-cylindrical chamfered surface, and the truncated cone body has a coaxially arranged arc-shaped limit step on one end surface facing the rectangular block. When the door frame swings and rotates around the axis of the hinge part, the semi-cylinder has no friction contact with the chamfered surface, and one end of the semi-cylinder with an inclined surface makes a circular motion without contact above the step surface of the arc-shaped limit step, and is stopped when it moves to contact the side walls at both ends of the arc-shaped limit step.

[0005] Furthermore, a hinge column coaxial with the chamfered surface is fixed to one end of the rectangular block away from the truncated cone body, the hinge column is rotatably mounted on one side wall of the gantry, the truncated cone body is rotatably mounted on the other side wall of the gantry, and the bottom of the rectangular block is fixedly connected to the driving arm.

[0006] Furthermore, the end face of the truncated cone body has a transmission gear whose rotating shaft is parallel to its axis, and the transmission gear is rotatably mounted on the end face of the truncated cone body. The transmission gear is meshed with a driving gear, and the driving gear is fixedly mounted on the main shaft of the driving motor. The main shaft is rotatably mounted in an end cover for connecting the driving motor, and the end cover is fixed to the door frame as a whole.

[0007] Furthermore, a cover body is fixedly connected to the end of the truncated cone body, an inner gear ring is fixed in the cover body, the inner gear ring is meshed with a speed gear rotatably mounted on the end surface of the truncated cone body, the speed gear is meshed with a power gear, the power gear is mounted on the rotating shaft of the micro motor, the micro motor is mounted in the truncated cone body and its rotating shaft extends out of the truncated cone body to fix the power gear.

[0008] Furthermore, the cylindrical surface of the semi-cylinder and the rounded surface of the rectangular block are in smooth rolling contact cooperation.

[0009] Furthermore, the first positioning pin is located at the bottom of the longitudinal beam at the bottom of the sheet metal main board, and is inserted directly into a circular hole on the longitudinal beam, and the second positioning pin is located in the circular hole at the top corner of the sheet metal main board to achieve the positioning installation of the sheet metal main board.

[0010] Furthermore, the clamping part includes a bearing block and an extrusion block, the bearing block is located below the extrusion block, and the extrusion block is flipped toward one side of the bearing block and pressed on the side upper surface of the sheet metal main board to clamp the sheet metal part in the up and down directions.

[0011] Furthermore, the clamping part also includes a mounting block, a positioning column, and a rotating arm. The mounting block is embedded with the positioning column that passes through its two opposite sides. The cross-section of the positioning column is rectangular, and the positioning column is provided with a rectangular notch that passes through along its length direction on one side of its horizontal diagonal line; the bottom end of the rotating arm is made of elastic material and has a rectangular hole that is socketed with the positioning column. The rectangular hole is provided with a rectangular narrow slit that passes through the surface of the rotating arm in the direction of one of its diagonals. The rectangular narrow slit passes through two opposite side surfaces of the rotating arm along the length direction of the positioning column, so that when the rotating arm is flipped 90 degrees toward the side where the sheet metal is located, it can automatically fit on the positioning column, and at this time, the rectangular narrow slit and the rectangular notch are perpendicular to each other, and the extrusion block is pressed on the side upper surface of the sheet metal mainboard.

[0012] Furthermore, an adjusting bolt is provided perpendicularly to the rectangular narrow slot of the rotating arm. The adjusting bolt is installed in the rotating arm for self-rotation in situ. The threaded section of the adjusting bolt extends into a polygonal groove on the side wall of the rectangular narrow slot. A sliding sleeve is axially slidably installed in the polygonal groove. One end of the sliding sleeve is located in the polygonal groove, and the other end is in extrusion contact with the other side wall of the rectangular narrow slot, so that when the adjusting bolt is rotated in situ, the sliding sleeve moves axially in the polygonal groove.

[0013] Furthermore, the first locating pin is installed on the first mounting frame, and the first mounting frame is installed on the cylinder. The cylinder telescopic movement carries the locating pin to move axially so as to be inserted into the corresponding circular hole; the second locating pin is fixed on the second mounting frame, and a supporting part is also fixed on the second mounting frame, and the supporting part includes a supporting block with a flat top. The second mounting frame is also telescopically moved vertically by the cylinder, and when the top surface of the supporting block is in contact with the bottom of the sheet metal mainboard, the two locating pins are not separated from the socket-fitting connection relationship with their respective circular holes.

[0014] The present invention provides an automobile sheet metal clamping workbench, which has the following beneficial effects:

[0015] 1. The clamping parts include the sheet metal main board and the channel steel plate, so the clamping is more secure, and the channel steel plate is not prone to loosening during welding when it is only clamped by the sheet metal main board. The overall clamping and positioning is more reliable.

[0016] 2. Fully automatic clamping control can be used to quickly achieve accurate and reliable clamping of automotive sheet metal parts.

[0017] 3. The special hinge structure between the driving arm and the gantry is used to improve the flexibility of the pre-installed automotive sheet metal parts on the bracket to be transferred to the subsequent workstations. Since it does not need to be disassembled from the clamping part and transferred to the next workstation, it also improves efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of an automobile sheet metal part;

[0019] Figure 2 A schematic diagram of clamping an automobile sheet metal part on the sheet metal clamping workbench of the present invention;

[0020] Figure 3 It is a partial schematic diagram of clamping an automobile sheet metal part on the sheet metal clamping workbench of the present invention;

[0021] Figure 4 It is a three-dimensional structural diagram of several clamping parts and supporting parts arranged on the bracket;

[0022] Figure 5 It is a structural diagram of the door frame and the hinged part;

[0023] Figure 6 It is an enlarged structural diagram of the clamping part;

[0024] Figure 7-8 Two structural schematic diagrams of the door frame and the hinged part;

[0025] Fig. 9 It is a partial enlarged structural diagram of the clamping part;

[0026] Fig.10 This is the installation structure diagram of the adjusting bolt.

[0027] In the figure: sheet metal main board 1, channel steel plate 2, longitudinal beam 3, clamping part 4, mounting block 401, rotating arm 402, positioning column 403, bearing block 404, extrusion block 405, rectangular notch 406, rectangular narrow slit 407, adjusting bolt 408, sliding sleeve 409, spring washer 410, first positioning pin 5, second positioning pin 6, bracket 7, door frame 8, first mounting frame 9, second mounting frame 10, driving arm 11, semi-cylinder 12, inclined surface 13, rectangular block 14, chamfered surface 15, truncated table body 16, arc-shaped limiting step 17, side wall 1701 at one end of arc-shaped limiting step, end cover 18, driving motor 19, transmission gear 20, driving gear 21, cover body 22, inner gear ring 23, speed change gear 24, power gear 25, micro motor 26. DETAILED DESCRIPTION

[0028] This specification will clearly and completely express the technical solutions in the following examples based on the drawings of the embodiments of the present invention. The implementation methods described in this specification are only some of the embodiments of the present invention, not all of them. All other embodiments extended and inspired by those skilled in the art based on these embodiments in this application without creative work should fall within the scope of protection of the present invention.

[0029] like Figure 1 The schematic diagram of the structure of a sheet metal part of an automobile is shown. When clamping the sheet metal part, the sheet metal clamping workbench used mainly includes a plurality of clamping parts 4 for clamping the edges of the sheet metal part, and a supporting part for supporting the sheet metal part. The clamping parts 4 are provided in plurality and are arranged at the edges of the sheet metal part to clamp and fix the sheet metal part around. In practice, Figure 3 At least two of the clamping parts 4 are used to clamp the lower side walls of the channel steel plate 2 on the left and right sides of the sheet metal main board 1. Because the channel steel plate 2 and the sheet metal main board 1 are partially riveted with rivets, the channel steel plate must be clamped to ensure stable clamping. Moreover, because the channel steel plate is a plate with a U-shaped outward-turned structure in cross section, the present embodiment chooses to clamp and fix the lower side walls of the channel steel plate 2. In addition, in the present embodiment, at least two locating pins are provided below the two opposite corners of the sheet metal part. The two locating pins are axially inserted into the two circular holes on the sheet metal part, respectively. Based on the positioning of the two circular holes, the overall positioning of the sheet metal part can be achieved. Then, with the support of the support part, the installation and placement can be completed. As for the support part, it can be some supporting parts that are adaptively selected or designed by technicians in this field according to the shape of the sheet metal part. In specific practice, such as Figure 4 It is also necessary to install the clamping part 4 and the positioning pin on a bracket 7, and the bracket 7 is flexibly hinged on a swinging part that swings back and forth. Figure 2The top of the driving arm 11 shown in the figure can be swung within a certain range to change the posture of the sheet metal part so as to facilitate subsequent assembly processes such as welding and fixing. During production, the driving arm 11 can rotate around the vertical axis, and the design structure of the swing component is as follows. Figure 5 As shown, it includes a substantially Π-shaped door frame 8 with a groove, the bottom of the groove of the door frame 8 has a raised semi-cylindrical body 12 in the shape of a half cylinder, and the right end face of the semi-cylindrical body 12 is an inclined surface 13 inclined toward the upper right. In addition, a hinged portion rotatably installed in the groove is required at the top of the driving arm 11, as shown in FIG. Figure 5 , this hinged part is used for the door clamp and the bracket 7 fixed together with it to swing at the top of the driving arm 11. The specific structure includes a rectangular block 14 and a truncated cone 16 which are arranged in sequence from left to right and are made by one-piece molding. If a split assembly structure is adopted here, it may be detrimental to the structural stability. The top surface of the rectangular block 14 is a semi-cylindrical chamfered surface 15, and the truncated cone 16 has a coaxially arranged arc-shaped limit step 17 on one end surface of the rectangular block 14, for example, a ring step surface with an arc of 3π / 2. When the door frame 8 swings around the axis of the hinged part, for example, when it swings back and forth and rotates, the semi-cylinder 12 does not have frictional contact with the chamfered surface 15, because if there is contact and friction, it will affect the flexibility of swinging. In use, one end of the semi-cylinder 12 provided with the inclined surface 13 makes a circular motion without contact above the step surface of the arc-shaped limit step 17, but when it moves to contact with the side walls at both ends of the arc-shaped limit step 17, that is, Figure 5 and Figure 7 When the side wall 1701 at one end of the arc-shaped limiting step shown in the figure is touched, a collision will occur, and the step will be prevented from continuing to swing forward and backward, that is, the swing limit is achieved, or the movement setting of the predetermined position is achieved.

[0030] like Figure 5 and Figure 7-8 As shown, as one of the specific implementation structures, a hinge column coaxial with the chamfered surface 15 is fixed to one end of the rectangular block 14 away from the truncated cone body 16, and the hinge column is used for rotatable installation of one side wall of the door frame 8, and the truncated cone body 16 is used for rotatable installation of the other side wall of the door frame 8, and the bottom of the rectangular block 14 is fixedly connected to the driving arm 11. In practice, the fixation of the hinge column and the driving arm 11 can be indirectly achieved by fixing the driving arm 11 to the rectangular block 14, so that the door frame 8, the bracket 7 and the automobile sheet metal parts they carry can swing back and forth, or left and right as a whole, and the specific orientation is matched according to the actual installation adaptability.

[0031] More specifically, if Figure 7As shown, the end face of the truncated cone body 16 has a transmission gear 20 whose rotating shaft is parallel to its axis. The transmission gear 20 is rotatably mounted on the end face of the truncated cone body 16, and the transmission gear 20 is meshed with a driving gear 21. The driving gear 21 is fixedly mounted on the main shaft of a driving motor 19. The main shaft of the driving motor 19 is rotatably mounted in an end cover 18 for connecting the driving motor 19. The end cover 18 has a cavity inside for installing the gear. At the same time, the end cover 18 is fixed to the gantry 8 as a whole, so that the end cover 18, the driving motor 19 and the gantry 8 can move together.

[0032] In addition to the above installation methods, you can also Figure 8 As shown, a cover body 22 is fixedly connected to the end of the truncated cone body 16, and an inner gear ring 23 is fixed inside the cover body 22. The inner gear ring 23 is meshed with a speed change gear 24 rotatably mounted on the end face of the truncated cone body 16. The speed change gear 24 is meshed with a power gear 25. The power gear 25 is mounted on the rotating shaft of a micro motor 26. The micro motor 26 is mounted in the truncated cone body 16. Therefore, the truncated cone body 16 here is thicker, and there is a cavity inside for installation, and it is best to have heat dissipation holes, etc. The rotating shaft of the micro motor 26 extends out of the truncated cone body 16, so that the power gear 25 can be fixedly installed so as to mesh with other gears for transmission to achieve the swinging motion mentioned above.

[0033] As a better design structure, such as Figure 8 As shown, the cylindrical surface of the semi-cylinder 12 of this embodiment is to be in smooth rolling contact with the chamfered surface 15 of the rectangular block 14, which can greatly improve the bearing capacity while maintaining flexibility in rotation, and is suitable for clamping and positioning of large-sized sheet metal parts of the same type.

[0034] When positioning, the first positioning pin 5 is located at the bottom of the longitudinal beam 3 at the bottom of the sheet metal main board 1, and is inserted into a circular hole (not shown in the figure) on the longitudinal beam 3. The second positioning pin 6 is located in the circular hole at the top corner of the sheet metal main board 1 to achieve the positioning and installation of the sheet metal main board 1. In this way, two-point positioning is performed on a roughly diagonal line, the structure is simpler, and the effect is best. When making, if Figure 6 and Fig. 9 As shown, the clamping portion 4 includes a supporting block 404 and an extrusion block 405, and the supporting block 404 is located below the extrusion block 405. After the extrusion block 405 is flipped toward the side of the supporting block 404, it can be pressed on the side upper surface of the sheet metal main board 1 to clamp the sheet metal in the up and down directions, thereby achieving clamping and fixing of the plate-shaped edge.

[0035] As a recommended design structure, Figure 6As shown, the clamping portion 4 also includes a mounting block 401, a positioning column 403, and a rotating arm 402. The mounting block 401 is embedded with a positioning column 403 that runs through its two opposite sides, that is, the positioning column 403 is fixed in the mounting block 401 by interference fit, and the cross-section of the positioning column 403 is rectangular. The positioning column 403 is provided with a rectangular notch 406 that runs through it along its length direction on one side of its horizontal diagonal line. One of the functions of this notch is to facilitate interference fit installation. During manufacturing, the bottom end of the rotating arm 402 is preferably made of a metal material with good elasticity. The rotating arm 402 has a rectangular hole that is socketed with the positioning column 403. The rectangular hole has a rectangular slit 407 that passes through the surface of the rotating arm 402 in the direction of one of its diagonals. The rectangular slit 407 passes through the two opposite sides of the rotating arm 402 along the length direction of the positioning column 403, so that when the rotating arm 402 is flipped 90 degrees toward the side where the sheet metal is located, it can automatically fit the position of the cross section, be sleeved on the positioning column 403, and clamp the positioning column 403. At this time, the rectangular slit 407 and the rectangular notch 406 are perpendicular to each other, and the extrusion block 405 is pressed on the side upper surface of the sheet metal main board 1. In actual use, the above structural design, because of the special rectangular cross-sectional structure and the rectangular slit 407 or rectangular notch 406 respectively, allows the rotating arm 402 and the positioning column 403 to rotate relative to each other. Once they are separated from the rectangular contours that fit each other, they will have a tendency to spontaneously fit into this rectangular contour, and then quickly and timely achieve the setting of the predetermined position, quickly flip to the predetermined position while maintaining a relatively stable fit, or a tightening effect, and have a certain self-locking function after reaching the predetermined matching position. As for the rotation of the rotating arm 402, the electromagnet can be directly installed on the mounting block 401 or the rotating arm 402. If the electromagnet is energized under normal circumstances, the electromagnet will suck the rotating arm 402 and make it in a horizontal position. When the direction of the electromagnet current changes, the rotating arm 402 is immediately repelled and flipped in the opposite direction, and then contacts and presses the sheet metal. Alternatively, a small motor can be directly used to drive the rotating arm 402 to rotate, or a number of gear transmissions can be used to realize the rotation of the rotating arm 402, etc. For those skilled in the art, it is not difficult to realize the rotation of the rotating arm 402 around the positioning column 403.

[0036] In order to control the tightness or flexibility of the elastic sleeve fit between the rotating arm 402 and the positioning column 403, as Fig.10As shown, an adjusting bolt 408 may be provided perpendicularly to the rectangular slit 407 of the rotating arm 402. The adjusting bolt 408 is installed in the rotating arm 402 in a self-rotating manner in situ. The threaded section of the adjusting bolt 408 extends into a polygonal groove on the side wall of the rectangular slit 407, and a sliding sleeve 409, such as a rectangular sliding sleeve 409 or a pentagonal sliding sleeve 409, is installed in the polygonal groove in an axially sliding manner, so as not to rotate. One end of the sliding sleeve 409 is located in the polygonal groove, and the other end is in compression contact with the other side wall of the rectangular slit 407, so that when the adjusting bolt 408 is rotated in situ, due to the action of the thread pair, the sliding sleeve 409 moves axially in the polygonal groove, thereby changing the width of the rectangular slit 407, changing the tightness of the fit or the flexibility of relative rotation, and seeking a fit that is easier to achieve the above-mentioned rectangular contour fit.

[0037] Finally, in practice, Figure 4 As shown, the first locating pin 5 is installed on the first mounting frame 9, and the first mounting frame 9 is installed on the cylinder. The cylinder telescopic movement carries the locating pin axially to be inserted into the corresponding circular hole to achieve positioning. At the same time, the second locating pin 6 is fixed on the second mounting frame 10. A supporting portion is also fixed on the second mounting frame 10, and the supporting portion includes a supporting block with a flat top so as to fit and support the sheet metal main board 1. The second mounting frame 10 is also telescopically moved vertically by the cylinder, and when the top surface of the supporting block fits with the bottom of the sheet metal main board 1, the two locating pins are not separated from the socket-fitting connection relationship with their respective circular holes to avoid affecting the positioning due to the support effect, causing the locating pin to slip out of the corresponding circular hole.

[0038] It should be explained here that, in this specification, terms such as first and second are only used to distinguish one feature from another, and do not mean that there is a certain relationship or order between these technical features. The terms "including" and "comprising" refer to the inclusion of one or some technical means or features, specifically meaning that there are other existing or non-existing technical features that have not been included. The discussion in the above embodiments is only a representative example for the present invention, and is by no means the only restrictive constraint feature. A person of ordinary skill in the art should understand that, without departing from the technical content recorded in all the claims of this application, some simple substitutions and modifications can be made, thereby changing or becoming equivalent to other specific embodiments and application scenarios. However, no matter how the adaptability is changed, these embodiments will inevitably fall within the scope of protection of the present invention.

Claims

1. An automobile sheet metal clamping workbench, comprising a plurality of clamping parts (4) for clamping the edges of sheet metal parts, and a supporting part for supporting the sheet metal parts, wherein the clamping parts (4) are provided in a plurality and are arranged at the edges of the sheet metal parts respectively, and characterized in that: At least two of the clamping parts (4) are used to clamp the lower side walls of the channel steel plate parts (2) on the left and right sides of the sheet metal main board (1); at least two positioning pins are provided below two opposite corners of the sheet metal part, and the two positioning pins are axially inserted into two circular holes on the sheet metal part respectively; The clamping portion (4) and the positioning pin are both mounted on a bracket (7), and the bracket (7) is hinged to the top end of a driving arm (11) through a swinging component that swings back and forth, and the driving arm (11) can rotate around a vertical axis; the swinging component includes a door frame (8) that is roughly Π-shaped and provided with a groove, and the bottom of the groove of the door frame (8) has a raised semi-cylindrical body (12) in the shape of a half cylinder, and the right end face of the semi-cylindrical body (12) is an inclined surface (13) inclined to the upper right; the top end of the driving arm (11) has a hinged portion rotatably mounted in the groove, and the hinged portion includes a plurality of integrally formed parts arranged in sequence from left to right. The rectangular block (14) and the truncated cone (16) are provided with a rectangular block (14) and a truncated cone (16), the top surface of the rectangular block (14) is a semi-cylindrical chamfered surface (15), and the truncated cone (16) has a coaxially arranged arc-shaped limiting step (17) on one end surface facing the rectangular block (14); when the door frame (8) swings and rotates around the axis of the hinge part, the semi-cylindrical body (12) does not make frictional contact with the chamfered surface (15), and one end of the semi-cylindrical body (12) provided with the inclined surface (13) performs a circular motion without contact above the step surface of the arc-shaped limiting step (17), and is stopped when it moves to contact the side walls at both ends of the arc-shaped limiting step (17); The clamping portion (4) comprises a bearing block (404) and an extrusion block (405), wherein the bearing block (404) is located below the extrusion block (405), and the extrusion block (405) is turned toward one side of the bearing block (404) and pressed against the upper side surface of the sheet metal main board (1) to clamp the sheet metal part in the up and down directions; the clamping portion (4) also comprises a mounting block (401), a positioning column (403), and a rotating arm (402), wherein the mounting block (401) is embedded with the positioning column (403) penetrating through two opposite sides thereof, the cross section of the positioning column (403) is rectangular, and the positioning column (403) is provided with a rectangular notch (403) penetrating through the length direction thereof on one side of the horizontal diagonal line thereof. 6); The bottom end of the rotating arm (402) is made of elastic material and has a rectangular hole that is socket-fitted with the positioning column (403); the rectangular hole is provided with a rectangular narrow slit (407) that penetrates the surface of the rotating arm (402) in the direction of one of its diagonals; the rectangular narrow slit (407) penetrates the two opposite sides of the rotating arm (402) along the length direction of the positioning column (403), so that when the rotating arm (402) is flipped 90 degrees toward the side where the sheet metal part is located, it can automatically fit on the positioning column (403), and at this time, the rectangular narrow slit (407) and the rectangular notch (406) are perpendicular to each other, and the extrusion block (405) is pressed on the upper surface of the side of the sheet metal main board (1).

2. The automobile sheet metal clamping workbench according to claim 1, characterized in that: A hinge column coaxial with the chamfered surface (15) is fixed to one end of the rectangular block (14) away from the truncated cone (16); the hinge column is used for rotationally mounting one side wall of the door frame (8); the truncated cone (16) is used for rotationally mounting the other side wall of the door frame (8); and the bottom of the rectangular block (14) is fixedly connected to the driving arm (11).

3. The automobile sheet metal clamping workbench according to claim 2, characterized in that: The end surface of the truncated cone body (16) is provided with a transmission gear (20) whose rotating shaft is parallel to its axis. The transmission gear (20) is rotatably mounted on the end surface of the truncated cone body (16). The transmission gear (20) is meshed with a driving gear (21). The driving gear (21) is fixedly mounted on the main shaft of the driving motor (19). The main shaft is rotatably mounted in an end cover (18) for connecting the driving motor (19). The end cover (18) is fixedly mounted on the door frame (8) as a whole.

4. The automobile sheet metal clamping workbench according to claim 2, characterized in that: A cover body (22) is fixedly connected to the end of the truncated cone body (16), and an inner gear ring (23) is fixed inside the cover body (22). The inner gear ring (23) meshes with a speed change gear (24) rotatably mounted on the end surface of the truncated cone body (16). The speed change gear (24) meshes with a power gear (25). The power gear (25) is mounted on the rotating shaft of a micro motor (26). The micro motor (26) is mounted inside the truncated cone body (16) and its rotating shaft extends out of the truncated cone body (16) to fix the power gear (25).

5. An automobile sheet metal clamping workbench according to any one of claims 1 to 4, characterized in that: The cylindrical surface of the semi-cylinder (12) and the rounded surface (15) of the rectangular block (14) are in smooth rolling contact.

6. The automobile sheet metal clamping workbench according to claim 1, characterized in that: The first positioning pin (5) is located at the bottom of the longitudinal beam (3) at the bottom of the sheet metal main board (1) and is inserted directly into a circular hole on the longitudinal beam (3). The second positioning pin (6) is located in the circular hole at the top corner of the sheet metal main board (1) to achieve positioning and installation of the sheet metal main board (1).

7. The automobile sheet metal clamping workbench according to claim 1, characterized in that: An adjusting bolt (408) is also provided perpendicularly to the rectangular narrow slot (407) of the rotating arm (402). The adjusting bolt (408) is installed in the rotating arm (402) in a self-rotating manner in situ. The threaded section of the adjusting bolt (408) extends into a polygonal groove on the side wall of the rectangular narrow slot (407). A sliding sleeve (409) is axially slidably installed in the polygonal groove. One end of the sliding sleeve (409) is located in the polygonal groove, and the other end is in compression contact with the other side wall of the rectangular narrow slot (407), so that when the adjusting bolt (408) is rotated in situ, the sliding sleeve (409) moves axially in the polygonal groove.

8. The automobile sheet metal clamping workbench according to claim 1, characterized in that: The first positioning pin (5) is mounted on the first mounting frame (9), and the first mounting frame (9) is mounted on the cylinder. The cylinder telescopic movement causes the positioning pin to move axially so as to be inserted into the corresponding circular hole. The second positioning pin (6) is fixed on the second mounting frame (10), and the second mounting frame (10) is also fixed with a supporting portion, and the supporting portion includes a supporting block with a flat top. The second mounting frame (10) is also telescopically moved vertically by the cylinder, and when the top surface of the supporting block is in contact with the bottom of the sheet metal main board (1), the two positioning pins are not separated from the socket-fitting connection relationship with their respective circular holes.

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