A welding turntable

Abstract

The present invention discloses a welding turntable, comprising a base and a workbench mounted on the base; a plurality of positioning columns that move up and down are arranged on the workbench, and the inner contour enclosed by the plurality of positioning columns matches the outer shape of the lower end of the workpiece; a bracket is fixedly connected to one side of the base, and the upper end of the bracket is fixedly connected to a cross frame extending to the top of the workbench, and a clamping device is arranged on the cross frame, and the clamping device clamps the upper end surface of the workpiece to clamp the workpiece, and the clamping device is transmission-connected with the positioning column so that the positioning column is retracted into the inside of the workbench when the clamping device clamps the workpiece. The present invention limits the outer shape of the workpiece by the positioning column, so that the position of the workpiece placed each time remains consistent, and then the workpiece is clamped by the clamping device for welding, and when the clamping device clamps the workpiece, the positioning column is retracted into the workbench through transmission, so as to avoid the positioning column blocking the weld and interfering with the welding of the workpiece circumference.

Description

Technical Field

[0001] The invention relates to the technical field of welding equipment, and in particular to a welding turntable. Background Art

[0002] Welding turntable, also known as welding rotary table, is one of the most widely used auxiliary equipment in the field of welding. It is mainly used for rotating and flipping round and annular workpieces. By adjusting the position of the workpiece, the weld is placed in the best position such as horizontal or boat-shaped for welding, thereby improving the welding efficiency and welding quality.

[0003] In forklift production, there are many rotating workpieces such as flanges and sleeves. A welding turntable is needed to fix the workpieces, and then a robotic arm carries a welding gun to automatically weld the weld. However, when placing the existing welding turntable, the workpiece position needs to be manually adjusted to keep the placement of the workpiece consistent, to adapt to the fixed welding gun movement trajectory, and to ensure the consistency of welding of different workpieces.

[0004] For example, in the prior art, a welding-specific turntable disclosed in Chinese Patent Publication No. CN110153622A, the workpiece is placed on an insulating turntable during operation. However, this device cannot ensure that the position of the workpiece remains consistent each time when placing the workpiece, and manual adjustment is required. Another example is a welding turntable disclosed in Chinese Patent Publication No. CN111151959A. When in use, the workpiece is placed on the workbench, and the adjustment mechanism in the clamping device is used to push the clamping block and the pressing block to move. When the pressing block contacts the workpiece, it squeezes the workpiece to clamp the workpiece. Clamping devices are provided on both sides of the upper end of the workbench. When clamping the workpiece, the clamping devices on both sides need to be adjusted separately, and the position accuracy can only be guaranteed after manual adjustment and measurement. In such disclosed devices, manual adjustment is required when clamping the workpiece, and the position of the workpiece is measured to ensure the consistency of the clamping position of different workpieces. Automatic alignment of the position cannot be achieved, and the clamping device hinders the welding of the weld seam on the outer side of the workpiece. Summary of the invention

[0005] The purpose of the present invention is to solve the above technical problems and provide a welding turntable.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A welding turntable comprises a base and a workbench installed on the base, the workbench is rotatably connected to the base; a plurality of positioning columns that move up and down are arranged on the workbench, the inner contour enclosed by the plurality of positioning columns matches the outer shape of the lower end of the workpiece, and the upper ends of the positioning columns extend to the outside of the workpiece on the workbench to limit the workpiece; a bracket is fixedly connected to one side of the base, and the upper end of the bracket is fixedly connected to a cross frame extending to the top of the workbench, and a clamping device is arranged on the cross frame, and the clamping device presses the upper end surface of the workpiece to clamp the workpiece, and the clamping device is transmission-connected to the positioning column so that the positioning column retracts into the inside of the workbench when the clamping device presses the workpiece.

[0008] Furthermore, the number of the positioning posts is no less than three and they are arranged in an array along the central circumference of the workbench.

[0009] Furthermore, a guiding inclined surface is provided on the upper end of the positioning column close to the workpiece.

[0010] Furthermore, a cover plate is fixedly connected to the bottom of the workbench, and the cover plate and the workbench are combined to form a accommodating cavity; a support plate is arranged in the accommodating cavity, a first through hole is opened on the workbench, the positioning column extends through the first through hole to the accommodating cavity and is fixedly connected to the support plate, a transmission column is fixedly connected to the middle part of the support plate, a second through hole is opened in the middle part of the workbench, and the transmission column extends to the second through hole; the clamping device includes a driving cylinder fixedly installed on a cross frame, a telescopic rod of the driving cylinder passes through the cross frame and is rotatably connected to a pressure plate, a push rod is fixedly connected to the bottom of the pressure plate, and the push rod is located above the transmission column, and when the driving cylinder drives the pressure plate to move downward to clamp the workpiece on the workbench, it drives the push rod to move downward to press the transmission column downward.

[0011] Furthermore, a first elastic element is disposed in the accommodating cavity, and the first elastic element is located below the support plate and abuts against the bottom of the support plate to provide an elastic force to lift the support plate upward.

[0012] Furthermore, the first elastic element is a compression spring.

[0013] Furthermore, an installation cavity is provided in the workbench, a locking pin is slidably connected in the installation cavity, a locking groove is provided on the side wall of the transmission column, one end of the locking pin is inserted in the locking groove to lock the transmission column; an extrusion rod is slidably connected to the workbench, the upper end of the extrusion rod is exposed on the top of the workbench, the extrusion rod is transmission-connected with the locking pin, when the workpiece is placed on the workbench, the workpiece presses on the upper end of the extrusion rod to press the extrusion rod into the workbench, and then the extrusion rod drives the locking pin to disengage from the locking groove to release the lock of the transmission column.

[0014] Furthermore, a first wedge-shaped inclined surface is provided at the lower end of the extrusion rod away from the transmission column, a wedge-shaped groove is provided on the locking pin, a second wedge-shaped inclined surface opposite to the first wedge-shaped inclined surface is provided in the wedge-shaped groove, and the extrusion rod is located above the wedge-shaped groove. When the extrusion rod moves downward, the lower end of the extrusion rod is inserted into the wedge-shaped groove, and the first wedge-shaped inclined surface squeezes the second wedge-shaped inclined surface so that the locking pin moves to the side away from the transmission column.

[0015] Furthermore, a second elastic element is disposed in the installation cavity. The second elastic element is located at an end of the locking pin away from the transmission column and abuts against the end of the locking pin.

[0016] Furthermore, a rotating shaft is fixedly connected to the bottom of the cover plate, the lower end of the rotating shaft is installed on the base and rotates with the base, a first bevel gear is fixedly connected to the rotating shaft, a driving motor is installed on the base, and the output shaft of the driving motor is fixedly connected to the second bevel gear, and the first bevel gear and the second bevel gear are meshed through gears to form a gear transmission, so that the driving motor drives the rotating shaft to rotate.

[0017] The welding turntable provided by the present invention has the following beneficial effects:

[0018] 1. When placing the workpiece, the workpiece is placed in the area enclosed by the positioning column, so that the positioning column limits the shape of the workpiece, so that the position of the workpiece is kept consistent each time, and then the workpiece is pressed by the clamping device for welding. When the clamping device presses the workpiece, the positioning column is retracted into the workbench through transmission, so as to avoid the positioning column blocking the weld and interfering with the welding around the workpiece;

[0019] 2. During operation, when placing the workpiece, the end of the locking pin is inserted into the locking groove to lock the transmission column, so that the support plate and the positioning column cannot move downward, to avoid the workpiece touching the positioning column during placement, so that the positioning column is retracted into the workbench and cannot play a positioning role; after placing the workpiece between the areas enclosed by the positioning columns on the workbench, the workpiece is pressed on the upper end of the extrusion rod, and under the action of gravity, the workpiece presses the extrusion rod downward into the workbench, and when the extrusion rod moves downward, it drives the locking pin to move and disengage from the locking groove, thereby releasing the lock on the transmission column, so that the support plate can drive the positioning column to move downward when the clamping device presses the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0021] Figure 1 A structural schematic diagram of a welding turntable provided by the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram of the local structure of part A in the middle;

[0023] Figure 3 for Figure 2 Schematic diagram of the local structure of the middle B part;

[0024] Figure 4 A schematic diagram of the structure of a pressure plate in a welding turntable provided by the present invention pressing on a workpiece;

[0025] Figure 5 for Figure 4 Schematic diagram of the local structure of part C in the middle.

[0026] Explanation of the numbers in the figure: 1. base; 2. workbench; 21. accommodating cavity; 22. support plate; 23. transmission column; 24. first elastic element; 25. mounting cavity; 26. locking pin; 261. wedge-shaped groove; 27. locking groove; 28. extrusion rod; 281. first wedge-shaped inclined surface; 29. ​​second elastic element; 3. positioning column; 31. guide inclined surface; 4. bracket; 41. cross frame; 5. clamping device; 51. driving cylinder; 52. pressure plate; 53. push rod; 6. cover plate; 61. rotating shaft; 62. first bevel gear; 7. driving motor; 71. second bevel gear; 8. workpiece. DETAILED DESCRIPTION

[0027] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0028] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up-down-left-right-front-back...) are only used to explain the relative position relationship - movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0030] like Figure 1-Figure 5As shown, a welding turntable comprises a base 1 and a workbench 2 installed on the base 1, and the workbench 2 is rotatably connected to the base 1; a plurality of positioning columns 3 that move up and down are arranged on the workbench 2, and the inner contour enclosed by the plurality of positioning columns 3 matches the lower end shape of the workpiece 8, and the upper ends of the positioning columns 3 extend to the outside of the workpiece 8 on the workbench 2 to limit the workpiece 8; a bracket 4 is fixedly connected to one side of the base 1, and the upper end of the bracket 4 is fixedly connected to a cross frame 41 extending to the top of the workbench 2, and a clamping device 5 is arranged on the cross frame 41, and the clamping device 5 is pressed on the upper end surface of the workpiece 8 to clamp the workpiece 8, and the clamping device 5 is transmission-connected to the positioning columns 3 so that the positioning columns 3 are retracted into the interior of the workbench 2 when the clamping device 5 presses the workpiece 8.

[0031] With the above solution, when in use, the workpiece 8 is placed on the upper surface of the workbench 2. When placing the workpiece 8, the workpiece 8 is placed in the area enclosed by the positioning column 3, so that the shape of the workpiece 8 is limited by the positioning column 3, so that the position of the workpiece 8 is kept consistent each time, and then the workpiece 8 is pressed by the clamping device 5 for welding. When the clamping device 5 presses the workpiece 8, the positioning column 3 is retracted into the workbench 2 through transmission, so as to avoid the positioning column 3 blocking the weld and interfering with the welding of the workpiece 8. Specifically, the positioning columns 3 are provided with no less than three, and are arranged in an array along the central circumference of the workbench 2.

[0032] A guide slope 31 is provided on the upper end of the positioning column 3 near the workpiece 8. The workpiece 8 is guided by the guide slope 31, so that the workpiece 8 is conveniently placed in the area enclosed by the positioning column 3.

[0033] A cover plate 6 is fixedly connected to the bottom of the workbench 2, and the cover plate 6 and the workbench 2 are enclosed to form a receiving cavity 21; a support plate 22 is arranged in the receiving cavity 21, a first through hole is opened on the workbench 2, the positioning column 3 passes through the first through hole and extends into the receiving cavity 21 and is fixedly connected to the support plate 22, a transmission column 23 is fixedly connected to the middle of the support plate 22, a second through hole is opened in the middle of the workbench 2, and the transmission column 23 extends into the second through hole;

[0034] The clamping device 5 includes a driving cylinder 51 fixed on the cross frame 41, the telescopic rod of the driving cylinder 51 passes through the cross frame 41 and is rotatably connected to a pressure plate 52, the bottom of the pressure plate 52 is fixedly connected to a push rod 53, and the push rod 53 is located above the transmission column 23. When the driving cylinder 51 drives the pressure plate 52 to move downward to clamp the workpiece 8 on the workbench 2, it drives the push rod 53 to move downward to press the transmission column 23 downward. During operation, after the workpiece 8 to be welded is placed on the workbench 2, the telescopic rod of the driving cylinder 51 is extended to drive the pressure plate 52 to move downward, and the pressure plate 52 moves downward and abuts against the top of the workpiece 8 to clamp the workpiece 8 on the workbench 2. At the same time, when the pressure plate 52 moves downward, it drives the push rod 53 to move downward and abuts against the transmission column 23. The push rod 53 continues to move downward, driving the transmission column 23 to move downward, and the transmission column 23 drives the support plate 22 to move downward, thereby making the positioning column 3 on the support plate 22 move downward and retract into the workbench 2. The upper end of the positioning column 3 does not leak out on the upper surface of the workbench 2 to prevent the positioning column 3 from affecting the welding.

[0035] The first elastic element 24 is disposed in the accommodating cavity 21. The first elastic element 24 is located below the support plate 22 and abuts against the bottom of the support plate 22 to provide an elastic force to push the support plate 22 upward. When welding is completed, the driving cylinder 51 drives the telescopic rod to retract, driving the pressing plate 52 and the push rod 53 to move upward. The support plate 22 moves upward and resets under the elastic force provided by the first elastic element 24, driving the positioning column 3 to move upward, and the upper end of the positioning column 3 passes through the workbench 2 and resets. The first elastic element 24 is a compression spring.

[0036] The workbench 2 is provided with an installation cavity 25, in which a locking pin 26 is slidably connected, and the side wall of the transmission column 23 is provided with a locking groove 27, one end of the locking pin 26 is inserted into the locking groove 27 to lock the transmission column 23; an extrusion rod 28 is slidably connected to the workbench 2, and the upper end of the extrusion rod 28 is exposed on the top of the workbench 2, and the extrusion rod 28 is transmission-connected with the locking pin 26. When the workpiece 8 is placed on the workbench 2, the workpiece 8 presses on the upper end of the extrusion rod 28 to press the extrusion rod 28 into the workbench 2, and then the extrusion rod 28 drives the locking pin 26 to disengage from the locking groove 27 to release the lock of the transmission column 23. During operation, when placing the workpiece 8, the end of the locking pin 26 is inserted into the locking groove 27 to lock the transmission column 23, so that the support plate 22 and the positioning column 3 cannot move downward, to prevent the workpiece 8 from touching the positioning column 3 during placement, so that the positioning column 3 is retracted into the workbench 2 and cannot play a positioning role; after the workpiece 8 is placed between the areas enclosed by the positioning columns 3 on the workbench 2, the workpiece 8 is pressed on the upper end of the extrusion rod 28, and under the action of gravity, the workpiece 8 presses the extrusion rod 28 downward into the workbench 2, and when the extrusion rod 28 moves downward, it drives the locking pin 26 to move and disengage from the locking groove 27, thereby releasing the lock on the transmission column 23, so that when the clamping device 5 presses the workpiece 8, the support plate 22 can drive the positioning column 3 to move downward.

[0037] A first wedge-shaped inclined surface 281 is provided at the lower end of the extrusion rod 28 on the side away from the transmission column 23, a wedge-shaped groove 261 is provided on the locking pin 26, and a second wedge-shaped inclined surface opposite to the first wedge-shaped inclined surface 281 is provided in the wedge-shaped groove 261, and the extrusion rod 28 is located above the wedge-shaped groove 261. When the extrusion rod 28 moves downward, the lower end of the extrusion rod 28 is inserted into the wedge-shaped groove 261, and the first wedge-shaped inclined surface 281 presses the second wedge-shaped inclined surface so that the locking pin 26 moves away from the transmission column 23. When the workpiece 8 is placed on the workbench 2, the workpiece 8 presses on the upper end of the extrusion rod 28 so that the extrusion rod 28 moves downward. During the downward movement of the extrusion rod 28, the lower end of the extrusion rod 28 is inserted into the wedge-shaped groove 261, and the first wedge-shaped inclined surface 281 presses the second wedge-shaped inclined surface so that the locking pin 26 moves away from the transmission column 23, so that the locking pin 26 releases the locking state of the transmission column 23.

[0038] A second elastic element 29 is disposed in the installation cavity 25. The second elastic element 29 is located at the end of the locking pin 26 away from the transmission column 23 and abuts against the end of the locking pin 26. The locking pin 26 is pushed toward the transmission column 23 by the elastic force provided by the second elastic element 29, so that when the extrusion rod 28 is not pressed down, the locking pin 26 remains inserted into the locking groove 27 on the transmission column 23, and the transmission column 23 is locked. Specifically, the second elastic element 29 is a compression spring.

[0039] The bottom of the cover plate 6 is fixedly connected to a rotating shaft 61, the lower end of which is mounted on the base 1 and rotates with the base 1, the rotating shaft 61 is fixedly connected to a first bevel gear 62, the base 1 is mounted with a driving motor 7, the output shaft of the driving motor 7 is fixedly connected to a second bevel gear 71, the first bevel gear 62 and the second bevel gear 71 are meshed with each other to form a gear transmission, so that the driving motor 7 drives the rotating shaft 61 to rotate. The driving motor 7 drives the rotating shaft 61 to rotate, thereby driving the workbench 2 to rotate, and the rotation of the workbench 2 drives the workpiece 8 to rotate, so as to facilitate the welding of the circumferential weld on the workpiece 8.

[0040] The parts not involved in this technical solution can be implemented by using existing technologies.

[0041] The above shows and describes the basic principles, main features and characteristics of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of the present invention to be protected includes the attached claims and their equivalents.

Claims

1. A welding turntable, comprising a base (1) and a worktable (2) mounted on the base (1), wherein the worktable (2) is rotatably connected to the base (1); characterized in that: A plurality of positioning columns (3) movable up and down are arranged on the workbench (2), the inner contour of the plurality of positioning columns (3) being matched with the outer shape of the lower end of the workpiece (8), and the upper ends of the positioning columns (3) extending to the outside of the workpiece (8) on the workbench (2) to limit the position of the workpiece (8); a bracket (4) is fixedly connected to one side of the base (1), the upper end of the bracket (4) is fixedly connected to a cross frame (41) extending to the top of the workbench (2), and a clamping device (5) is arranged on the cross frame (41), the clamping device (5) is clamped on the upper end surface of the workpiece (8) to clamp the workpiece (8), and the clamping device (5) is transmission-connected to the positioning columns (3) so that when the clamping device (5) clamps the workpiece (8), the positioning columns (3) are retracted into the interior of the workbench (2); A cover plate (6) is fixedly connected to the bottom of the workbench (2), and the cover plate (6) and the workbench (2) are enclosed to form a receiving cavity (21); a support plate (22) is arranged in the receiving cavity (21); a first through hole is opened on the workbench (2); the positioning column (3) passes through the first through hole and extends into the receiving cavity (21) and is fixedly connected to the support plate (22); a transmission column (23) is fixedly connected to the middle of the support plate (22); a second through hole is opened in the middle of the workbench (2); the transmission column (23) extends to the second through hole; the clamping device (5) comprises a driving cylinder (51) fixed on the cross frame (41); the telescopic rod of the driving cylinder (51) passes through the cross frame (41) and is rotatably connected to a pressing plate (52); the bottom of the pressing plate (52) is fixedly connected to a push rod (53); the push rod (53) is located above the transmission column (23); when the driving cylinder (51) drives the pressing plate (52) to move downward to clamp the workpiece (8) on the workbench (2), the push rod (53) is driven to move downward to press the transmission column (23) downward; A first elastic element (24) is arranged in the accommodating cavity (21), and the first elastic element (24) is located below the support plate (22) and abuts against the bottom of the support plate (22) to provide an elastic force to lift the support plate (22) upwards; The workbench (2) is provided with an installation cavity (25), a locking pin (26) is slidably connected in the installation cavity (25), a locking groove (27) is provided on the side wall of the transmission column (23), one end of the locking pin (26) is inserted into the locking groove (27) to lock the transmission column (23); an extrusion rod (28) is slidably connected to the workbench (2), the upper end of the extrusion rod (28) is exposed on the top of the workbench (2), the extrusion rod (28) is transmission-connected with the locking pin (26), when the workpiece (8) is placed on the workbench (2), the workpiece (8) presses on the upper end of the extrusion rod (28), presses the extrusion rod (28) into the workbench (2), and then the extrusion rod (28) drives the locking pin (26) to disengage from the locking groove (27) to release the lock on the transmission column (23).

2. A welding turntable according to claim 1, characterized in that: The number of the positioning columns (3) is no less than three and they are arranged in an array along the central circumference of the workbench (2).

3. A welding turntable according to claim 1, characterized in that: A guiding inclined surface (31) is provided on the upper end of the positioning column (3) on a side close to the workpiece (8).

4. A welding turntable according to claim 1, characterized in that: The first elastic element (24) is a compression spring.

5. The welding turntable according to claim 1, characterized in that: A first wedge-shaped inclined surface (281) is provided at the lower end of the extrusion rod (28) on the side away from the transmission column (23); a wedge-shaped groove (261) is provided on the locking pin (26); a second wedge-shaped inclined surface opposite to the first wedge-shaped inclined surface (281) is provided in the wedge-shaped groove (261); the extrusion rod (28) is located above the wedge-shaped groove (261); when the extrusion rod (28) moves downward, the lower end of the extrusion rod (28) is inserted into the wedge-shaped groove (261); the first wedge-shaped inclined surface (281) squeezes the second wedge-shaped inclined surface so that the locking pin (26) moves to the side away from the transmission column (23).

6. A welding turntable according to claim 5, characterized in that: A second elastic element (29) is arranged in the installation cavity (25), and the second elastic element (29) is located at an end of the locking pin (26) away from the transmission column (23) and abuts against the end of the locking pin (26).

7. A welding turntable according to any one of claims 4 to 6, characterized in that: The bottom of the cover plate (6) is fixedly connected to a rotating shaft (61); the lower end of the rotating shaft (61) is mounted on the base (1) and rotatably cooperates with the base (1); the rotating shaft (61) is fixedly connected to a first bevel gear (62); a driving motor (7) is mounted on the base (1); the output shaft of the driving motor (7) is fixedly connected to a second bevel gear (71); the first bevel gear (62) and the second bevel gear (71) are meshed with each other to form a gear transmission, so that the driving motor (7) drives the rotating shaft (61) to rotate.

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