Arc-shaped workpiece welding positioning device

Abstract

The invention discloses an arc-shaped workpiece welding positioning device, and relates to the technical field of welding positioning equipment, the positioning device comprises a position changing mechanism, the position changing mechanism comprises a fixed plate and a rotating plate arranged on the upper side of the fixed plate, and the fixed plate and the rotating plate are connected through a rotating assembly so as to support the rotating plate to rotate on a fixed plane; the positioning mechanism comprises a plurality of groups of clamping units arranged on the rotating plate and a driving unit for driving the clamping units to realize clamping / loosening, the plurality of groups of clamping units are distributed on the upper surface of the rotating plate in the circumferential direction, and the clamping units are movably arranged in the radial direction of the rotating plate; the leveling mechanism comprises a plurality of supporting legs connected with the fixing plate, and the supporting height of any supporting leg is adjustable so that the levelness of the displacement mechanism can be adjusted. The positioning precision of the arc-shaped workpiece can be improved, the device can adapt to the arc-shaped workpieces of different sizes, and rapid leveling of the arc-shaped workpiece is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of welding positioning equipment, and in particular to a welding positioning device for arc-shaped workpieces. Background Art

[0002] In the mechanical manufacturing industry, welding arc-shaped workpieces (such as flanges and gear rings) requires high weld uniformity and precision. Currently, manual welding is commonly used, requiring manual workpiece rotation or torch movement. This results in poor welding accuracy and inefficient welding. Traditional positioning devices are unable to effectively position arc-shaped workpieces of varying sizes, resulting in poor positioning accuracy, which also affects welding precision and efficiency. Furthermore, welding sites often have uneven surfaces, and positioning devices lack quick leveling mechanisms, requiring the use of shims or complex hydraulic devices for leveling, severely impacting welding efficiency.

[0003] Therefore, in response to the above technical problems, how to improve the welding accuracy and welding efficiency of arc-shaped workpieces is a technical problem that technical personnel in this field need to solve. Summary of the Invention

[0004] The purpose of this application is to provide a circular arc workpiece welding positioning device, which can improve the positioning accuracy of the circular arc workpiece, adapt to circular arc workpieces of different sizes, and realize rapid leveling of the circular arc workpiece.

[0005] To achieve the above objectives, the present application provides an arc-shaped workpiece welding positioning device, comprising:

[0006] The displacement mechanism includes a fixed plate and a rotating plate provided on the upper side of the fixed plate, wherein the fixed plate and the rotating plate are connected by a rotating assembly to support the rotating plate to rotate on a fixed plane;

[0007] The positioning mechanism includes a plurality of clamping units provided on the rotating plate and a driving unit for driving the clamping units to clamp / release, wherein the plurality of clamping units are distributed circumferentially on the upper surface of the rotating plate, and the clamping units are movably arranged radially along the rotating plate;

[0008] The leveling mechanism includes a plurality of supporting legs connected to the fixing plate, and the supporting height of any of the supporting legs is adjustable to adjust the horizontality of the displacement mechanism.

[0009] Preferably, the rotating assembly includes an annular guide rail fixed to the lower side of the rotating plate, at least three fixed seats are evenly distributed on the upper surface of the fixed plate, and rollable balls are provided in the fixed seats. The balls protrude from the upper surface of the fixed seats, and an annular groove is provided on the lower surface of the annular guide rail. The annular groove is adapted to the balls protruding from the upper surface of the fixed seat so that the rotating plate can rotate 360°.

[0010] Preferably, the balls have the same specifications, and the centers of the balls are located in the same horizontal plane, and the center of each ball is located on a distribution circle with the axis of the rotating plate as the center.

[0011] Preferably, the driving unit includes an electromagnetic driving device provided on the lower side of the rotating plate, the clamping unit includes an electromagnetic clamping claw, and the electromagnetic driving device cooperates with the electromagnetic clamping claw to achieve clamping, loosening and positioning of the electromagnetic clamping claw.

[0012] Preferably, the leveling mechanism further comprises:

[0013] a mounting bracket fixed to the lower surface of the fixing plate, wherein the mounting bracket is provided with a first hinge position, the mounting bracket is rotatably connected to the support leg via the first hinge position, and the support leg rotates in a vertical plane;

[0014] A movable hinge seat is sleeved on the outer periphery of the support leg and is movably arranged along the length direction of the support leg, and the movable hinge seat is provided with a second hinge position;

[0015] A central rod is fixed at the center of the fixed plate and extends downward, the central rod is provided with a height-adjustable central hinge seat, and the central hinge seat is provided with a plurality of third hinge positions;

[0016] an adjusting rod, both ends of which are connected to the second hinge position and the third hinge position respectively, and the length of the adjusting rod is adjustable to adjust the rotation angle of the supporting leg;

[0017] Wherein, during the rotation of the support leg, the support leg and the center rod are located in the same vertical plane.

[0018] Preferably, ear plates are provided at the first hinge position, the second hinge position and the third hinge position, and the ear plates cooperate with the hinge shaft to realize hinged connection.

[0019] Preferably, the adjusting rod includes a rod body and end shafts arranged at both ends of the rod body, the end shafts are threadedly connected to the rod body, and the two end shafts are respectively hinged to the second hinge position and the third hinge position, and the rod body is rotated to adjust the extension length of the end shafts.

[0020] Preferably, the inner ring of the movable hinge seat is in sliding contact with the outer wall of the support leg, and the central hinge seat is fixedly connected to the central rod via a positioning bolt.

[0021] Preferably, the upper surface of the rotating plate is further provided with a plurality of radial grooves, at least one group of the clamping units is slidably provided in each of the radial grooves, and scale lines are provided on the outer edges of the radial grooves.

[0022] Preferably, a spirit level is provided on the fixed plate and / or the rotating plate.

[0023] Compared with the above-mentioned background technology, the present application fixes the workpiece on the rotating plate of the displacement mechanism through a positioning mechanism, and the rotating plate is rotatably connected to the fixed plate through a rotating assembly, so that the rotation of the rotating plate can realize the rotation of the workpiece, which is convenient for realizing rotational welding of the workpiece; the multiple groups of clamping units of the positioning mechanism are distributed along the circumference of the rotating plate, so that the workpiece can be clamped and positioned along the circumference, ensuring that multiple points on the circumference of the workpiece have a stable clamping effect; at the same time, the clamping units can move radially along the rotating plate, thereby adjusting the clamping width between the clamping units and the clamping position of the clamping units in the radial direction, thereby adapting to the clamping and positioning of arc-shaped workpieces of different sizes. In addition, the present application uses a leveling mechanism to adjust the horizontality of the fixed plate and the rotating plate. According to the actual situation of the ground, by adjusting the support height of the support legs, it can quickly adapt to the uneven ground and ensure that the positioning plane of the workpiece remains horizontal. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0025] Figure 1 A schematic diagram of the three-dimensional structure of the arc-shaped workpiece welding positioning device provided in an embodiment of the present application;

[0026] Figure 2 This is an exploded view of the arc-shaped workpiece welding positioning device provided in an embodiment of the present application.

[0027] In the figure: 1- positioning mechanism; 2- displacement mechanism; 3- leveling mechanism; 4- spirit level;

[0028] 11- clamping unit;

[0029] 21-fixed plate; 22-rotating plate; 23-annular guide rail; 24-fixed seat; 25-ball; 221-radial groove;

[0030] 31-support leg; 32-mounting bracket; 33-hinge shaft; 34-movable hinge seat; 35-adjusting rod; 36-center hinge seat; 37-center rod; 321-first hinge position; 341-second hinge position; 361-third hinge position. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] It should be noted that in this embodiment, the directions or positional relationships indicated by "upper," "lower," "front," and "back" are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0034] like Figure 1 and Figure 2 As shown, in this embodiment, a circular arc workpiece welding positioning device is provided, which includes a shifting mechanism 2, a positioning mechanism 1 and a leveling mechanism 3. The shifting mechanism 2 is used to change the position of the workpiece, thereby meeting the welding requirements of the workpiece at different positions; specifically, the shifting mechanism 2 includes a fixed plate 21 and a rotating plate 22 arranged on the upper side of the fixed plate 21. The rotating plate 22 is connected to the fixed plate 21 through a rotating assembly, thereby ensuring that the rotating plate 22 can rotate within a fixed plane. When the workpiece is placed on the rotating plate 22, the workpiece can rotate with the rotating plate 22, thereby realizing the change of the welding position of the workpiece.

[0035] The positioning mechanism 1 can position the workpiece on the rotating plate 22 according to welding requirements. It includes several groups of clamping units 11 disposed on the rotating plate 22 and a drive unit that drives the clamping units 11 to clamp or release. The multiple groups of clamping units 11 are distributed circumferentially on the upper surface of the rotating plate 22, thereby positioning the workpiece along its circumference and ensuring the workpiece's positioning accuracy. At the same time, each group of clamping units 11 can also move radially along the rotating plate 22. The radially movable clamping units 11 can accommodate workpieces of different sizes. After the clamping units 11 are clamped, they can be positioned by the drive unit to ensure the overall positioning of the workpiece.

[0036] The leveling mechanism 3 includes at least three support legs 31 connected to the fixed plate 21, evenly distributed around the circumference of the fixed plate 21 to ensure stable support. The support height of each support leg 31 is adjustable, thereby changing the horizontality of the positioner mechanism 2, ensuring that the workpiece is positioned on a horizontal surface and ensuring welding accuracy.

[0037] In summary of the above embodiments, the present application fixes the workpiece on the rotating plate 22 of the displacement mechanism 2 through the positioning mechanism 1. The rotating plate 22 is rotatably connected to the fixed plate 21 through a rotating assembly, so that the rotation of the rotating plate 22 realizes the rotation of the workpiece, which facilitates the rotation welding of the workpiece; the multiple groups of clamping units 11 of the positioning mechanism 1 are distributed circumferentially along the rotating plate 22, so that the workpiece can be clamped and positioned circumferentially, ensuring that multiple points on the circumference of the workpiece have a stable clamping effect; at the same time, the clamping units 11 can move radially along the rotating plate 22, thereby adjusting the clamping width between the clamping units 11 and the clamping position of the clamping units 11 in the radial direction, thereby adapting to the clamping and positioning of arc-shaped workpieces of different sizes. In addition, the present application uses a leveling mechanism 3 to adjust the horizontality of the fixed plate 21 and the rotating plate 22. According to the actual situation of the ground, by adjusting the support height of the support legs 31, it can quickly adapt to the uneven ground and ensure that the positioning plane of the workpiece remains horizontal.

[0038] Please refer to Figure 2 The rotating assembly includes an annular guide rail 23 fixed to the lower side of the rotating plate 22. The annular guide rail 23 can be coaxially arranged with the rotating plate 22. There are at least three fixed seats 24 evenly arranged on the upper surface of the fixed plate 21. Each fixed seat 24 is provided with a receiving groove, and a rollable ball 25 is embedded in the receiving groove. It should be noted that due to the existence of the receiving groove, the ball 25 will not fall out of the receiving groove when rolling. In addition, the ball 25 protrudes from the upper surface of the fixed seat 24, and the lower surface of the annular guide rail 23 is provided with an annular groove, which can be adapted to the part of the ball 25 protruding from the fixed seat 24, so that under the action of the ball 25, the annular guide rail 23 can rotate around a fixed axis.

[0039] It should be noted that the cooperation between the annular groove and the ball bearing 25 can provide a certain radial limiting effect, thereby ensuring that the annular guide rail 23 rotates only along the axis, and the rotation angle is any angle between 0 and 360 degrees. In some embodiments, considering the rotation accuracy of the rotating plate 22, a servo motor can be provided on the fixed plate 21. The operating end of the servo motor engages with the annular guide rail 23 or the rotating plate 22 via a gear. The high-precision rotation of the servo motor ensures the rotation accuracy of the rotating plate 22.

[0040] In addition, the rotating assembly can axially constrain the fixed plate 21 and the rotating plate 22 to prevent the two from accidentally disengaging. For example, by providing a constraining mechanism on the fixed seat 24, the constraining mechanism is axially clamped with the annular guide rail 23 and does not affect the rotation of the annular guide rail 23. The constraining mechanism includes an L-shaped part, the vertical edge of the L-shaped part is located at the outer periphery of the annular guide rail 23, and the horizontal edge of the L-shaped part is located on the upper surface of the annular guide rail 23, thereby cooperating with the fixed seat 24 to form an axial limit clamp for the annular guide rail 23 to prevent the annular guide rail 23 from accidentally disengaging, thereby realizing the axial limitation of the fixed plate 21 and the rotating plate 22; of course, the constraining mechanism can also be omitted, so that the fixed plate 21 and the rotating plate 22 can be detachably connected, that is, the annular guide rail 23 is directly placed on the ball 25, and under the action of the gravity of the rotating plate 22 and the workpiece thereon, the annular guide rail 23 can be pressed tightly on the ball 25, which also has higher stability. It should be noted that the detachable connection method can facilitate the replacement and maintenance of the rotating plate 22 and the positioning mechanism 1 on the rotating plate 22.

[0041] In some embodiments, the upper surface of the fixed plate 21 is flat, and the specifications of the fixed seats 24 are all the same. Therefore, to ensure the overall flatness of the displacement mechanism 2, the specifications of each ball 25 are also the same, and the centers of the balls 25 are located in the same plane. Given that the fixed plate 21 is horizontal, the plane containing the centers of the balls 25 is also horizontal. The center of each ball 25 is located on a distribution circle centered on the axis of the rotating plate 22, ensuring that each ball 25 can roll properly within the annular groove, without interference or other issues that may affect the normal rotation of the annular guide rail 23.

[0042] The driving unit includes an electromagnetic driving device arranged on the lower side of the rotating plate 22, and the clamping unit 11 includes an electromagnetic clamp. The electromagnetic driving device cooperates with the electromagnetic clamp to realize the clamping, releasing and positioning operations of the electromagnetic clamp; when the workpiece is placed on the rotating plate 22, the electromagnetic clamp is actuated to clamp the workpiece, and the electromagnetic clamp is positioned by the electromagnetic driving device to ensure that the workpiece can be accurately located at the target position.

[0043] Please refer to Figure 2The leveling mechanism 3 also includes a mounting bracket 32, a movable hinge seat 34, a center hinge seat 36, a center rod 37 and an adjusting rod 35. The mounting bracket 32 ​​is fixed to the lower surface of the fixed plate 21 and is evenly distributed along the circumference. A first hinge position 321 is provided on the mounting bracket 32. The mounting bracket 32 ​​is rotatably connected to the support leg 31 through the first hinge position 321, so that the support leg 31 rotates in the vertical plane. During the rotation of the support leg 31, the vertical length of the support leg 31 changes, and the vertical length is the support height of the support leg 31, so that the height of the fixed plate 21 is changed by the rotation of the support leg 31; when the ground is uneven, the corresponding support leg 31 can be adaptively adjusted to change its support height, so as to achieve the purpose of adjusting the displacement mechanism 2 to a horizontal state.

[0044] The movable hinge seat 34 is sleeved on the outer periphery of the support leg 31 and is movably arranged along the length direction of the support leg 31. The movable hinge seat 34 is provided with a second hinge position 341; the center rod 37 is fixed at the axis of the fixed plate 21 and extends a certain length downward without contacting the ground. The center rod 37 is sleeved with a height-adjustable center hinge seat 36, and the center hinge seat 36 is provided with a third hinge position 361.

[0045] The ends of the adjustment rod 35 are respectively connected to the second hinge position 341 and the third hinge position 361, thereby connecting the support leg 31 to the center rod 37 through the adjustment rod 35. On the basis of the fixed arrangement of the center rod 37, the adjustment rod 35 provides a stable fixing effect for the support leg 31, ensuring stable support of the support leg 31. The length of the adjustment rod 35 is adjustable. By adjusting the length of the adjustment rod 35, the support leg 31 can be rotated about the first hinge position 321. After the adjustment rod 35 adjusts the support leg 31 to rotate, the adjustment rod 35 can still stably connect the support leg 31 and the center rod 37, maintaining the stability of both.

[0046] During the rotation of the support leg 31, the rotation plane of the support leg 31 at the first hinge position 321 is in a vertical plane, the rotation plane of the adjustment rod 35 at the second hinge position 341 is also in a vertical plane, and the rotation planes of the adjustment rod 35 and the third hinge position 361 are also in a vertical plane, and the above three vertical planes are all in the same vertical plane. The support leg 31 and the center rod 37 are in the same vertical plane, thereby ensuring that the support leg 31 has a stable support effect in the vertical direction.

[0047] It is foreseeable that the number of the third hinge positions 361 on the central hinge seat 36 should be consistent with the number of the movable hinge seats 34 , so as to achieve a one-to-one corresponding connection effect through the multiple adjustment rods 35 .

[0048] Furthermore, ear plates are provided at the first hinge position 321, the second hinge position 341 and the third hinge position 361, and the ear plates cooperate with the hinge shaft 33 to achieve hinged connection; the specific hinge method can refer to the existing technology and will not be repeated here.

[0049] The adjusting rod 35 includes a rod body and end shafts provided at both ends of the rod body. The end shafts are threadedly connected to the rod body, and in the same adjusting rod 35, the two end shafts are respectively hinged to the second hinge position 341 and the third hinge position 361. Due to the limitations of the two hinge positions, when the rod body is rotated, the two end shafts at both ends cannot rotate, which will cause the rod body and the end shaft to rotate relative to each other. Under the action of the threaded connection, the end shaft can move axially relative to the rod body, thereby adjusting the protruding length of the end shaft to achieve the purpose of adjusting the length of the adjusting rod 35.

[0050] During the process of adjusting the angle of the support leg 31, the movable hinge seat 34 and the support leg 31 will undergo relative displacement. At the same time, the movable hinge seat 34 also needs to provide stable support for the support leg 31. Therefore, the inner circle of the movable hinge seat 34 can be slid into contact with the outer wall of the support leg 31. On the basis of not affecting the relative movement between the two, stable support for the support leg 31 can be achieved; in addition, since the center hinge seat 36 is height-adjustable, the maximum rotation angle of the support leg 31 can be rotated according to actual conditions. For example, when the center hinge seat 36 is located at the upper part of the center rod 37, the adjustment rod 35 is closer to the first hinge position 321, so the support leg 31 can have a larger angle adjustment effect; and when the center hinge seat 36 is located at the lower part of the center rod 37, the adjustment rod 35 is away from the first hinge position 321, so the maximum adjustable angle of the support leg 31 will become smaller, thereby adapting to different ground conditions. After the center hinge seat 36 completes the height adjustment, it can be fixedly connected to the center rod 37 by a positioning bolt, that is, the positioning bolt is threadedly connected to the center hinge seat 36, and the end of the positioning bolt abuts against the center rod 37, thereby achieving the center hinge seat 36 being locked at the target position on the center rod 37.

[0051] Please refer to Figure 2 The rotating plate 22 has several radial grooves 221 on its upper surface. Each radial groove 221 slides within at least one clamping unit 11. Scale lines are provided along the outer edges of the radial grooves 221 to record the workpiece's clamping position, enabling precise positioning and clamping of the workpiece. A level 4 is also provided on the fixed plate 21 and / or the rotating plate 22. In actual use, the level rod is manually adjusted by observing the level 4 until it is horizontal. The workpiece is then placed on the rotating plate 22 and clamped and positioned using the positioning mechanism 1.

[0052] In summary, the present application adapts to arc-shaped workpieces of different sizes through the radially movable clamping unit 11, and can ensure that the workpiece will not be displaced due to stress deformation during the welding process; the present application can weld the workpiece in different positions by rotating the rotating plate 22 while the welding gun is fixed, and at the same time, the leveling mechanism 3 is used to cope with the uneven ground at the welding site, and the positioning plane is ensured to be level by adjusting the rotation angle of the support leg 31. Compared with adding gaskets and complex hydraulic system leveling, the production cost is reduced and the production efficiency is improved.

[0053] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0054] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A circular arc workpiece welding positioning device, characterized in that: include: The displacement mechanism (2) comprises a fixed plate (21) and a rotating plate (22) provided on the upper side of the fixed plate (21), wherein the fixed plate (21) and the rotating plate (22) are connected via a rotating assembly to support the rotating plate (22) to rotate on a fixed plane; A positioning mechanism (1) comprises a plurality of groups of clamping units (11) provided on the rotating plate (22) and a driving unit for driving the clamping units (11) to achieve clamping / loosening, wherein the plurality of groups of clamping units (11) are distributed along the circumferential direction on the upper surface of the rotating plate (22), and the clamping units (11) are arranged to move radially along the rotating plate (22); The leveling mechanism (3) comprises a plurality of support legs (31) connected to the fixing plate (21), wherein the support height of any one of the support legs (31) is adjustable to adjust the horizontality of the displacement mechanism (2).

2. The arc-shaped workpiece welding positioning device according to claim 1, characterized in that: The rotating assembly comprises an annular guide rail (23) fixedly arranged on the lower side of the rotating plate (22); at least three fixing seats (24) are evenly distributed on the upper surface of the fixing plate (21); rollable balls (25) are arranged in the fixing seats (24); the balls (25) protrude from the upper surface of the fixing seats (24); an annular groove is provided on the lower surface of the annular guide rail (23); the annular groove is adapted to the balls (25) protruding from the upper surface of the fixing seats (24), so that the rotating plate (22) can rotate 360 ​​degrees.

3. The arc-shaped workpiece welding positioning device according to claim 2, characterized in that: The balls (25) have the same specifications, and the centers of the balls (25) are located in the same horizontal plane. The center of each ball (25) is located on a distribution circle with the axis of the rotating plate (22) as the center.

4. The arc-shaped workpiece welding positioning device according to claim 1, characterized in that: The driving unit comprises an electromagnetic driving device provided on the lower side of the rotating plate (22); the clamping unit (11) comprises an electromagnetic clamping claw; the electromagnetic driving device cooperates with the electromagnetic clamping claw to achieve clamping, loosening and positioning of the electromagnetic clamping claw.

5. The arc-shaped workpiece welding positioning device according to claim 1, characterized in that: The leveling mechanism (3) further comprises: a mounting bracket (32) fixed to the lower surface of the fixing plate (21), the mounting bracket (32) being provided with a first hinge position (321), the mounting bracket (32) being rotatably connected to the support leg (31) via the first hinge position (321), and the support leg (31) being rotatable in a vertical plane; A movable hinge seat (34) is sleeved on the outer periphery of the support leg (31) and is movably arranged along the length direction of the support leg (31), and the movable hinge seat (34) is provided with a second hinge position (341); A central rod (37) is fixed at the axis of the fixed plate (21) and extends downward. A height-adjustable central hinge seat (36) is sleeved on the central rod (37). The central hinge seat (36) is provided with a plurality of third hinge positions (361). an adjusting rod (35), both ends of which are respectively connected to the second hinge position (341) and the third hinge position (361); the adjusting rod (35) is adjustable in length to adjust the rotation angle of the supporting leg (31); Wherein, during the rotation of the support leg (31), the support leg (31) and the center rod (37) are located in the same vertical plane.

6. The arc-shaped workpiece welding positioning device according to claim 5, characterized in that: The first hinge position (321), the second hinge position (341) and the third hinge position (361) are all provided with ear plates, and the ear plates cooperate with the hinge shaft (33) to achieve hinged connection.

7. The arc-shaped workpiece welding positioning device according to claim 5, characterized in that: The adjusting rod (35) comprises a rod body and end shafts provided at both ends of the rod body, the end shafts being threadedly connected to the rod body, and the two end shafts being hinged to the second hinge position (341) and the third hinge position (361) respectively, and the rod body is rotated to adjust the extension length of the end shafts.

8. The arc-shaped workpiece welding positioning device according to claim 5, characterized in that: The inner ring of the movable hinge seat (34) is in sliding contact with the outer wall of the support leg (31), and the central hinge seat (36) is fixedly connected to the central rod (37) via a positioning bolt.

9. The arc-shaped workpiece welding positioning device according to claim 1, characterized in that: The upper surface of the rotating plate (22) is further provided with a plurality of radial grooves (221), at least one group of the clamping units (11) is slidably arranged in each radial groove (221), and scale lines are provided on the outer edges of the radial grooves (221).

10. The arc-shaped workpiece welding positioning device according to claim 1, characterized in that: A level is provided on the fixed plate (21) and / or the rotating plate (22).

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