Heavy-duty drill processing automatic centering center clamping device

Abstract

The application discloses a heavy drill processing automatic centering center clamping device and relates to the technical field of machine tools.The application comprises a base, an inner wall bottom of the base is fixed with a gas cylinder, an extension end top of the gas cylinder is fixed with a middle base, a top of the middle base penetrates through an inner wall top of the base in a vertical direction, the top of the middle base is rotationally installed with a walking wheel one, both sides of the top of the base are fixed with hinged frames, and both sides of the middle base are hinged with short swing arm connecting rods.In the application, two long swing arm connecting rods are in a laterally open state with two walking wheels two, a laterally open clamping layout is adopted, a rod piece can be quickly taken and placed without passing through a through hole, the application is especially suitable for super-long size rod pieces, the problem of complicated passing through of a traditional closed chuck is completely solved, and the operation efficiency is improved by more than 10%, and the walking wheel one and the two walking wheels two are automatically opened and closed through driving of the gas cylinder, and manual adjustment is not needed.

Description

Technical Field

[0001] This invention relates to the field of machine tool technology, specifically to an automatic centering clamping device for heavy-duty brazing. Background Technology

[0002] Lathes perform cutting operations by driving the workpiece to rotate. In the lathe machining of circular metal rods, in order to prevent radial swaying when the rod rotates at high speed, the free end needs to be fixed and limited.

[0003] Currently, the industry commonly uses through-hole chucks as the fixing mechanism for long rods. These chucks have a closed structure, requiring the long rod to be inserted through the central through-hole before clamping. However, this method has significant technical drawbacks when machining long, round metal rods: the insertion and clamping process for long, round metal rods is cumbersome, requiring manual insertion of the entire rod through the chuck's through-hole. This is difficult, time-consuming, and lacks flexibility, making it impossible to quickly adapt to rods of different diameters. Furthermore, post-clamping adjustments are inconvenient, severely impacting machining efficiency. Therefore, we propose an automatic centering clamping device for heavy-duty brazing. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an automatic centering clamping device for heavy-duty brazing, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a heavy-duty brazing automatic centering clamping device, comprising a base, a cylinder fixed to the bottom of the inner wall of the base, a middle seat fixed to the top of the telescopic end of the cylinder, the top of the middle seat vertically penetrating the top of the inner wall of the base, a first wheel rotatably mounted on the top of the middle seat, hinge frames fixed to both sides of the top of the base, short swing arm connecting rods hinged to both sides of the middle seat, a long swing arm connecting rod hinged to the end of the short swing arm connecting rod away from the middle seat, the middle part of the long swing arm connecting rod hinged to the hinge frame, and a second wheel rotatably mounted to the end of the long swing arm connecting rod away from the short swing arm connecting rod.

[0006] According to the above technical solution, the second wheel is inclined, and both the first wheel and the second wheel have built-in high-strength bearings.

[0007] According to the above technical solution, an adjustment device is provided below the base. The adjustment device includes a long groove plate, a slide rod is fixed inside the long groove plate, a slider is slidably installed outside the slide rod, a compression spring is provided between the slider and the inner wall of the long groove plate, and two H-shaped frames are fixed on the outer wall of the slider. The H-shaped frames vertically penetrate the bottom of the base, and a screw is vertically rotatably installed inside one side of the H-shaped frame. A threaded plate is threadedly connected to the outside of the screw, and the threaded plate is fixed to the inner wall of the base.

[0008] According to the above technical solution, the adjustment device also includes several locking holes opened on the top of the long slot plate, a threaded sleeve fixed on the outer wall of the H-shaped frame on one side, and a screw rod connected to the internal thread of the threaded sleeve.

[0009] According to the above technical solution, the size of the locking hole is adapted to the size of the second screw, and the second screw is inserted into the inside of the locking hole.

[0010] According to the above technical solution, a calibration device is provided above the base. The calibration device includes three L-shaped sliding plates. The three L-shaped sliding plates are respectively fixed to the outer walls of the middle base and the two long swing arm connecting rods. An L-shaped sliding plate is slidably installed inside the L-shaped sliding plate. A T-shaped column is fixed to the outer wall of the vertical support plate of the L-shaped sliding plate. The T-shaped column passes through the vertical support plate of the L-shaped sliding plate. A spring is provided between the T-shaped column and the outer wall of the vertical support plate of the L-shaped sliding plate. An abutment wheel is rotatably installed on the outer wall of the L-shaped sliding plate.

[0011] According to the above technical solution, the diameter of the three abutting wheels is five centimeters larger than the diameter of the first wheel and the two second wheels, and the three abutting wheels are respectively concentrically arranged with the first wheel and the two second wheels.

[0012] According to the above technical solution, a five-centimeter gap is left between the vertical support plate of the L-shaped slide plate and the vertical support plate of the L-shaped slide groove plate.

[0013] According to the above technical solution, a locking device is provided at the base. The locking device includes an elastic telescopic rod fixed to the top of the base. A U-shaped connecting rod is fixed to the telescopic end of the elastic telescopic rod. A U-shaped push rod is fixed to the outer wall of the U-shaped connecting rod, and a gap is left between the U-shaped push rod and the outer wall of the base for the displacement of the U-shaped push rod. A vertical pressure plate is fixed to the side of the U-shaped connecting rod away from the U-shaped push rod. An elastic telescopic column is fixed to the middle pivot of the long swing arm connecting rod. An L-shaped pressure plate is fixed to the telescopic end of the elastic telescopic column. A limit plate is fixed to the outer wall of the vertical support plate of the L-shaped slide plate near the L-shaped pressure plate.

[0014] According to the above technical solution, the opposing surfaces of the three limiting plates, the vertical pressure plate, and the two L-shaped pressure plates are all serrated.

[0015] This invention provides an automatic centering clamping device for heavy-duty brazing. It has the following advantages:

[0016] (1) In the initial state, the two long swing arm connecting rods with the two wheels are in a side-open state. The side-open clamping layout allows for quick loading and unloading of rods without the need for rods to pass through the through holes. It is especially suitable for extra-long rods, completely solving the problem of cumbersome loading of traditional closed chucks. The operating efficiency is improved by more than 90%. The automatic opening and closing of the first wheel and the two wheels is achieved by the cylinder drive, without the need for manual adjustment. At the same time, the opening and closing range of the first wheel and the two wheels can be adapted to long round metal rods of different diameters without the need to replace parts.

[0017] (2) By adjusting the device, the present invention enables the screw, threaded plate, base, and H-shaped frame to move the first wheel and the two second wheels, thereby achieving the purpose of adjusting the center distance between the first wheel and the two second wheels and the machine tool chuck; at the same time, the screw can limit the movement length of the base, thereby ensuring that when the spring is compressed and the slider is reset, the slider will not drive the base to move out of the position of the rod length through the H-shaped frame, thereby avoiding the problem that the base will drive the first wheel and the two second wheels to move out of the rod due to the slider reset when the machine tool tool is no longer against the base during the retraction process, thus ensuring that the first wheel and the two second wheels can continuously support the rod when the machine tool tool is retracted and cutting is performed again.

[0018] (3) By setting up a calibration device, the present invention enables the cylinder, the middle seat, the first wheel, the long swing arm connecting rod, the second wheel, the contact wheel, the L-shaped slide plate, and the L-shaped slide groove plate to cooperate, so that the operator can judge whether the first wheel and the two second wheels are not on the center distance of the machine tool chuck by observing whether there is a gap between the L-shaped slide groove plate and the L-shaped slide plate, thereby ensuring the geometric accuracy of the center distance calibration between the first wheel and the two second wheels and the machine tool chuck.

[0019] (4) The present invention, through the setting of the locking device, enables the U-shaped push rod, base, U-shaped connecting rod, vertical pressure plate, middle seat, limiting plate, L-shaped pressure plate and long swing arm connecting rod to drive the L-shaped pressure plate to limit the position of the L-shaped slide plate and the contact wheel through the limiting plate. At this time, the contact wheel will support the outer wall of the rod after surface cutting. As the tool cuts again and again, the diameter of the rod gradually becomes smaller, and the originally fixed support points (wheel one and two wheel two) will fail. At this time, the T-shaped column and the spring automatically push the contact wheel to always stick to the outer wall of the rod, so that no matter how fine the rod is cut, the contact wheel can automatically "follow" and always keep in contact without manual intervention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the entire invention. Figure One ;

[0021] Figure 2 This is a schematic diagram of the entire invention. Figure Two ;

[0022] Figure 3 This is a partial structural diagram of the entire invention;

[0023] Figure 4 This is a partial structural schematic diagram of the adjusting device of the present invention;

[0024] Figure 5 This is a schematic diagram of the calibration device of the present invention;

[0025] Figure 6 This is a schematic diagram of the locking device of the present invention;

[0026] Figure 7 For the present invention Figure 6 An enlarged schematic diagram of the structure at point A.

[0027] In the diagram: 1. Base; 2. Adjustment device; 21. Long groove plate; 22. Slide rod; 23. Compression spring; 24. Slider; 25. H-shaped frame; 26. Threaded plate; 27. Screw one; 28. Threaded sleeve; 29. ​​Screw two; 210. Locking hole; 3. Calibration device; 31. L-shaped slide plate; 32. T-shaped column; 33. L-shaped slide plate; 34. Abutment wheel; 4. Locking device; 41. Elastic telescopic rod; 42. U-shaped connecting rod; 43. U-shaped push rod; 44. Vertical pressure plate; 45. Elastic telescopic column; 46. L-shaped pressure plate; 47. Limiting plate; 5. Cylinder; 6. Middle seat; 7. First wheel; 8. Short swing arm connecting rod; 9. Hinge frame; 10. Long swing arm connecting rod; 11. Second wheel. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Please see Figure 1 - Figure 7This invention provides a technical solution: a heavy-duty brazing automatic centering clamping device, comprising a base 1, a cylinder 5 fixed to the bottom of the inner wall of the base 1, a middle seat 6 fixed to the top of the telescopic end of the cylinder 5, the top of the middle seat 6 vertically penetrating the top of the inner wall of the base 1, a first wheel 7 rotatably mounted on the top of the middle seat 6, hinge frames 9 fixed to both sides of the top of the base 1, short swing arm connecting rods 8 hinged to both sides of the middle seat 6, a long swing arm connecting rod 10 hinged to the end of the short swing arm connecting rod 8 away from the middle seat 6, the middle part of the long swing arm connecting rod 10 hinged to the hinge frame 9, a second wheel 11 rotatably mounted to the end of the long swing arm connecting rod 10 away from the short swing arm connecting rod 8, the second wheel 11 being inclined, and the first wheel 7 and the second wheel 7 being rotatably mounted on the middle seat 6. Both wheels 11 and 21 have built-in high-strength bearings. The high-strength bearings allow the first wheel 7 and the second wheel 11 to rotate synchronously with the rod at high speed, thus ensuring the stability of the rod and avoiding sliding friction between the first wheel 7 and the second wheel 11 and the rod. This does not interfere with the rod processing. In the initial state, the two long swing arm connecting rods 10 and the two wheels 21 are in a side-open state. The side-open clamping layout allows for quick loading and unloading of rods without the need for rods to pass through through holes. This is especially suitable for extra-long rods and completely solves the problem of cumbersome loading of traditional closed chucks. At the same time, the opening and closing range of the first wheel 7 and the two wheels 211 can be adapted to long round metal rods of different diameters without the need to replace parts.

[0030] An adjustment device 2 is provided below the base 1. The adjustment device 2 includes a long slot plate 21. A slide rod 22 is fixed inside the long slot plate 21. A slider 24 is slidably installed outside the slide rod 22. A compression spring 23 is provided between the slider 24 and the inner wall of the long slot plate 21. Two H-shaped frames 25 are fixed on the outer wall of the slider 24. The H-shaped frames 25 vertically penetrate the bottom of the base 1. A screw 27 is vertically rotatably installed inside one side of the H-shaped frame 25. A threaded plate 26 is threadedly connected to the outside of the screw 27. The threaded plate 26 is fixed to the inner wall of the base 1. With the above structure, the screw 27 drives the base 1 to move upward through the threaded plate 26. The base 1 will drive the first wheel 7 and the two second wheels 11 to move accordingly, thereby achieving the purpose of adjusting the center distance between the first wheel 7 and the two second wheels 11 and the machine tool chuck.

[0031] The adjusting device 2 also includes several locking holes 210 on the top of the long slot plate 21 and a threaded sleeve 28 fixed to the outer wall of the H-shaped frame 25 on one side. The threaded sleeve 28 is internally threaded with a screw 29. The size of the locking hole 210 is adapted to the size of the screw 29. The screw 29 is inserted into the locking hole 210. Through the above structure, the screw 29 limits the movement length of the base 1, thereby ensuring that when the compression spring 23 resets the slider 24, the slider 24 will not drive the base 1 to move out of the position of the rod length through the H-shaped frame 25. This avoids the problem that the machine tool tool no longer abuts against the base 1 during the retraction process, and the base 1 drives the first wheel 7 and the two second wheels 11 to move out of the rod due to the reset of the slider 24.

[0032] A calibration device 3 is installed above the base 1. The calibration device 3 includes three L-shaped slide plates 31, which are respectively fixed to the outer walls of the central base 6 and the two long swing arm connecting rods 10. An L-shaped slide plate 33 is slidably installed inside the L-shaped slide plate 31. A T-shaped column 32 is fixed to the outer wall of the vertical support plate of the L-shaped slide plate 33. The T-shaped column 32 passes through the vertical support plate of the L-shaped slide plate 31. A spring is provided between the T-shaped column 32 and the outer wall of the vertical support plate of the L-shaped slide plate 31. A contact wheel 34 is rotatably installed on the outer wall of the L-shaped slide plate 33. The diameter of the three contact wheels 34 is larger than that of the slide plate 33. The diameter of wheel 7 and the two rollers 11 is 5 cm larger, and the three abutting wheels 34 are respectively concentrically set with wheel 7 and the two rollers 11. There is a 5 cm gap between the vertical support plate of the L-shaped slide plate 33 and the vertical support plate of the L-shaped slide plate 31. With the above structure, the operator can judge whether the roller 7 and the two rollers 11 are on the center distance of the machine tool chuck by observing whether there is a gap between the L-shaped slide plate 31 and the L-shaped slide plate 33, thus ensuring the geometric accuracy of the center distance calibration between the roller 7 and the two rollers 11 and the machine tool chuck.

[0033] A locking device 4 is provided at the base 1. The locking device 4 includes an elastic telescopic rod 41 fixed to the top of the base 1. A U-shaped connecting rod 42 is fixed to the telescopic end of the elastic telescopic rod 41. A U-shaped push rod 43 is fixed to the outer wall of the U-shaped connecting rod 42, and a gap is left between the U-shaped push rod 43 and the outer wall of the base 1 for the displacement of the U-shaped push rod 43. A vertical pressure plate 44 is fixed to the side of the U-shaped connecting rod 42 away from the U-shaped push rod 43. An elastic telescopic column 45 is fixed at the middle pivot of the long swing arm connecting rod 10. An L-shaped pressure plate 46 is fixed to the telescopic end of 45. A limit plate 47 is fixed to the outer wall of the vertical support plate of the L-shaped slide plate 33 near the L-shaped pressure plate 46. The three limit plates 47 and the opposite surfaces of the vertical pressure plate 44 and the two L-shaped pressure plates 46 are all serrated. With the above structure, the T-shaped column 32, in conjunction with the spring, automatically pushes the contact wheel 34 to always keep it close to the outer wall of the rod. This ensures that no matter how fine the rod is cut, the contact wheel 34 can automatically "follow" and always maintain contact without manual intervention.

[0034] In use, the long slot plate 21 is installed inside the machine tool with bolts. After the operator fixes the long rod workpiece in the machine tool chuck position, the operator rotates the screw 29. Under the thread restriction of the threaded sleeve 28, the screw 29 moves upward and separates from the locking hole 210. At this time, the base 1 moves freely on the long slot plate 21 through the H-shaped frame 25 and the slider 24. Since the two long swing arm connecting rods 10 are initially in a side-open state with the two wheels 11, the rods at the machine tool chuck will not interfere with the operation of the base 1. The base 1 is moved to the machine tool chuck position, and the operator starts the cylinder 5. The extension end of the cylinder 5 drives the wheel 7 to move upward and approach the outer wall of the rod through the middle seat 6. At the same time, the middle seat 6 pushes the short swing arm connecting rod 8 to drive the long swing arm connecting rod 10 to swing. The long swing arm connecting rod 10 drives the wheel 11 to approach the outer wall of the rod, so that the wheel 7 and the two wheels 11 form a support on the outside of the rod.

[0035] In its initial state, the two long swing arm connecting rods 10, along with the two wheels 11, are in a side-open position. This side-open clamping layout allows for quick loading and unloading of rods without the need for inserting rods through holes, making it particularly suitable for extra-long rods. It completely solves the problem of cumbersome insertion of traditional closed chucks, improving operational efficiency by more than 60%. Furthermore, the automatic opening and closing of the wheels 7 and 11 is achieved by the cylinder 5, eliminating the need for manual adjustment. The opening and closing range of the wheels 7 and 11 can accommodate long, round metal rods of different diameters without the need to replace any parts.

[0036] It should be noted that during the machining of the cutting rod, the machine tool will retract and then cut again. That is, when the base 1 moves to the position of the machine tool chuck, the operator inserts the second screw 29 into the locking hole 210 corresponding to the length of the rod. The second screw 29 limits the movement length of the base 1, thereby ensuring that when the compression spring 23 resets the slider 24, the slider 24 will not drive the base 1 out of the length of the rod through the H-shaped bracket 25. This avoids the problem that the base 1 will move out of the rod due to the slider 24 resetting and the machine tool no longer pressing against the base 1 during the retraction process. This ensures that the first wheel 7 and the two second wheels 11 can continuously support the rod when the machine tool retracts and resumes the cutting operation.

[0037] It should also be noted that each time the machine tool tool performs a cutting operation, the mounting seat of the machine tool tool will abut against the outer wall of the base 1, causing the base 1 to move accordingly. Under the elastic force of the compression spring 23, the compression spring 23 pushes the slider 24 and the H-shaped frame 25 to keep the base 1 in contact with the machine tool tool.

[0038] Due to differences in machine tool models, during initial installation and use, it is necessary to calibrate the center distance between the positioning wheel 7 and the two wheels 11 and the machine tool chuck. At this time, the operator needs to adjust the height of the base 1. The operator rotates the screw 27, which drives the base 1 to move upward along the outer wall of the H-shaped frame 25 through the threaded plate 26. The base 1 will then drive the wheels 7 and 11 to move accordingly, thereby achieving the purpose of adjusting the center distance between the wheels 7 and 11 and the machine tool chuck.

[0039] During the initial center distance calibration, the operator activates cylinder 5 to move drive wheel 7 and the two secondary wheels 11 towards the rod, ensuring that the center distance between wheel 7 and the two secondary wheels 11 is consistent with the machine tool chuck. At this time, as cylinder 5 extends and retracts, the center seat 6 drives wheel 7 towards the outer wall of the rod, and the two long swing arm connecting rods 10 drive wheel 11 towards the outer wall of the rod. Simultaneously, the center seat 6 and the long swing arm connecting rods 10 drive the corresponding contact wheels 34 towards the outer wall of the rod. After contacting the outer wall of the rod, the contact wheels 34 stop moving. When the contact wheel 34 moves, the L-shaped slide plate 33 stops moving. As the center seat 6 and the two long swing arm connecting rods 10 continue to move, the center seat 6 and the two long swing arm connecting rods 10 will drive the corresponding L-shaped slide plate 31 to move towards the L-shaped slide plate 33. At this time, the operator can judge whether the first wheel 7 and the two second wheels 11 are not at the center distance of the machine tool chuck by observing whether there is a gap between the L-shaped slide plate 31 and the L-shaped slide plate 33. This ensures the geometric accuracy of the center distance calibration between the first wheel 7 and the two second wheels 11 and the machine tool chuck.

[0040] After each cut of the rod by the machine tool, the diameter of the rod decreases (wheel 7 and the two wheels 11 no longer contact the outer wall of the rod). After the machine tool retracts, the mounting seat of the machine tool no longer abuts against the base 1 (the mounting seat of the machine tool no longer abuts against the U-shaped push rod 43). At this time, under the action of the spring force corresponding to the T-shaped column 32, the T-shaped column 32 drives the abutting wheel 34 to abut against the outer wall of the rod after surface cutting via the L-shaped slide plate 33. Then, as the machine tool performs another cutting operation, the mounting seat of the machine tool will abut against the outer wall of the base 1, causing the base 1 to move along with it. The mounting seat of the cutting tool will first abut against the U-shaped push rod 43 and move towards the outer wall of the base 1. The U-shaped push rod 43 pushes the U-shaped connecting rod 42 to move the vertical pressure plate 44 towards the limiting plate 47 corresponding to the middle seat 6. At the same time, the U-shaped push rod 43 pushes the U-shaped connecting rod 42 to move the L-shaped pressure plate 46 towards the limiting plate 47 corresponding to the long swing arm connecting rod 10. During the above process, the U-shaped connecting rod 42 will squeeze the telescopic end of the elastic telescopic rod 41. The L-shaped pressure plate 46 will restrict the position of the L-shaped sliding plate 33 and the contact wheel 34 through the limiting plate 47. At this time, the contact wheel 34 will support the outer wall of the rod after surface cutting.

[0041] As the cutting tool cuts repeatedly, the diameter of the rod gradually decreases, and the originally fixed support points (wheel 1 7 and two wheels 2 11) will become ineffective. At this time, the T-shaped column 32, in conjunction with the spring, automatically pushes the contact wheel 34 to always keep it in close contact with the outer wall of the rod, so that no matter how fine the rod is cut, the contact wheel 34 can automatically "follow" and always maintain contact without manual intervention or adjustment.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A heavy-duty brazing automatic centering clamping device, comprising a base (1), characterized in that: A cylinder (5) is fixed to the bottom of the inner wall of the base (1). A middle seat (6) is fixed to the top of the telescopic end of the cylinder (5). The top of the middle seat (6) extends vertically through the top of the inner wall of the base (1). A first wheel (7) is rotatably installed on the top of the middle seat (6). A hinge frame (9) is fixed to both sides of the top of the base (1). A short swing arm connecting rod (8) is hinged to both sides of the middle seat (6). A long swing arm connecting rod (10) is hinged to the end of the short swing arm connecting rod (8) away from the middle seat (6). The middle part of the long swing arm connecting rod (10) is hinged to the hinge frame (9). A second wheel (11) is rotatably installed at the end of the long swing arm connecting rod (10) away from the short swing arm connecting rod (8).

2. The heavy-duty brazing automatic centering clamping device according to claim 1, characterized in that: The second wheel (11) is inclined, and both the first wheel (7) and the second wheel (11) have built-in high-strength bearings.

3. The heavy-duty brazing automatic centering clamping device according to claim 1, characterized in that: An adjustment device (2) is provided below the base (1). The adjustment device (2) includes a long groove plate (21). A slide rod (22) is fixed inside the long groove plate (21). A slider (24) is slidably installed outside the slide rod (22). A compression spring (23) is provided between the slider (24) and the inner wall of the long groove plate (21). Two H-shaped frames (25) are fixed on the outer wall of the slider (24). The H-shaped frames (25) vertically penetrate the bottom of the base (1). A screw (27) is vertically rotatably installed inside one side of the H-shaped frame (25). A threaded plate (26) is threadedly connected to the outside of the screw (27). The threaded plate (26) is fixed to the inner wall of the base (1).

4. The heavy-duty brazing automatic centering clamping device according to claim 3, characterized in that: The adjustment device (2) also includes several locking holes (210) on the top of the long slot plate (21) and a threaded sleeve (28) fixed on the outer wall of the H-shaped frame (25) on one side. The threaded sleeve (28) is internally threaded with a screw (29).

5. The heavy-duty brazing automatic centering clamping device according to claim 4, characterized in that: The size of the locking hole (210) is adapted to the size of the screw two (29), and the screw two (29) is inserted into the inside of the locking hole (210).

6. The heavy-duty brazing automatic centering clamping device according to claim 1, characterized in that: A calibration device (3) is provided above the base (1). The calibration device (3) includes three L-shaped slide plates (31). The three L-shaped slide plates (31) are respectively fixed to the outer walls of the middle seat (6) and the two long swing arm connecting rods (10). An L-shaped slide plate (33) is slidably installed inside the L-shaped slide plate (31). A T-shaped column (32) is fixed to the outer wall of the vertical support plate of the L-shaped slide plate (33). The T-shaped column (32) passes through the vertical support plate of the L-shaped slide plate (31). A spring is provided between the T-shaped column (32) and the outer wall of the vertical support plate of the L-shaped slide plate (31). An abutment wheel (34) is rotatably installed on the outer wall of the L-shaped slide plate (33).

7. The heavy-duty brazing automatic centering clamping device according to claim 6, characterized in that: The diameter of the three abutting wheels (34) is five centimeters larger than the diameter of the first wheel (7) and the two second wheels (11), and the three abutting wheels (34) are respectively concentrically arranged with the first wheel (7) and the two second wheels (11).

8. The heavy-duty brazing automatic centering clamping device according to claim 6, characterized in that: A five-centimeter gap is left between the vertical support plate of the L-shaped slide plate (33) and the vertical support plate of the L-shaped slide rail plate (31).

9. The heavy-duty brazing automatic centering clamping device according to claim 6, characterized in that: A locking device (4) is provided at the base (1). The locking device (4) includes an elastic telescopic rod (41) fixed to the top of the base (1). A U-shaped connecting rod (42) is fixed to the telescopic end of the elastic telescopic rod (41). A U-shaped push rod (43) is fixed to the outer wall of the U-shaped connecting rod (42). A gap is left between the U-shaped push rod (43) and the outer wall of the base (1) for the U-shaped push rod (43) to move. A vertical pressure plate (44) is fixed to the side of the U-shaped connecting rod (42) away from the U-shaped push rod (43). An elastic telescopic column (45) is fixed to the middle pivot of the long swing arm connecting rod (10). An L-shaped pressure plate (46) is fixed to the telescopic end of the elastic telescopic column (45). A limit plate (47) is fixed to the outer wall of the vertical support plate of the L-shaped slide plate (33) near the L-shaped pressure plate (46).

10. The heavy-duty brazing automatic centering clamping device according to claim 9, characterized in that: The opposing surfaces of the three limiting plates (47) and the vertical pressure plate (44) and the two L-shaped pressure plates (46) are all serrated.

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