An automatic rotary welding fixture device

Abstract

The application provides an automatic rotary welding tool device, which comprises a base, a balance block, a clamp structure, a control panel and a welding main body. The upper end of the base is connected to the clamp structure through the balance block, and the welding main body is arranged on the other side of the surface of the base and is in the same horizontal line with the clamp structure. The vertical block of the clamp structure is combined with the adjusting body to adjust the height of the fixed body, so that the height of the upper fixed disc of the balance plate and the distance between the upper fixed disc and the lower fixed disc are consistent with the length of the cylindrical workpiece. Then, the rotary rod at the center of the upper fixed disc is used to make the compensator enter the hollow of the cylindrical workpiece to support the hollow, so as to prevent the mismatch caused by the inconsistent length and the vibration offset caused by the hollow of the cylindrical workpiece during rotary welding. Therefore, the adaptation strength of the device is improved, and the precision and stability during rotary welding are improved.

Description

Technical Field

[0001] This invention relates to the field of rotary welding fixture technology, and more specifically to an automatic rotary welding fixture device. Background Technology

[0002] Automatic rotary welding fixtures are specialized automated fixtures for welding operations. By keeping the welding torch stationary and using a motor to drive the workpiece to rotate at a constant speed, the weld seam of ring-shaped, cylindrical, and other types of workpieces is rotated evenly to the most suitable welding position. Then, the fixed welding torch is used to perform continuous and precise welding on the ring-shaped weld seam. It is mostly used for welding seams of round, cylindrical, and shaft-type workpieces, thereby improving welding quality and production efficiency. In summary, the inventors have found that the existing automatic rotary welding fixtures have the following main defects: because the overall length of the clamping structure of the current automatic rotary welding fixtures is limited, it is very easy for the length to be mismatched when facing cylindrical workpieces of different lengths. Therefore, other auxiliary fixing accessories are required for fixing. This will result in difficulty in fixing cylindrical workpieces of various lengths due to the influence of length, thereby reducing the ease of use and stability of the current device during welding. Meanwhile, because the inside of the cylindrical workpiece is hollow, it is very easy for the whole to shake during the welding process due to the hollowness, which will reduce the accuracy of the weld position and further reduce the actual use effect of the current device. Summary of the Invention

[0003] The technical solution adopted by the present invention to achieve the technical objective is: an automatic rotary welding fixture device, the structure of which includes: a base, a balance block, a clamping structure, a control panel, and a welding body. The upper end of the base is positioned by the balance block to limit the position of the clamping structure. The welding body on the other side of the base surface carries the control panel and is on the same horizontal straight line as the clamping structure.

[0004] As a further improvement of the present invention, the clamp structure is provided with a sliding groove, a sliding block, a vertical block, an adjusting body, and a fixing body. The sliding groove and the sliding block are integrated, and the interior of the vertical block on the upper side overlaps and contacts the adjusting body. The upper side of the adjusting body is fixedly connected to the fixing body.

[0005] As a further improvement of the present invention, the fixing body is further provided with a rotating block, a balance plate, a pull block, an upper fixing plate, a rotating rod, a compensator, a lower fixing plate, and a rotating base. The rotating block is located on the side of the balance plate. The balance plate drives the rotating block to rotate through the pull block. The upper fixing plate is located at the center of the balance plate and the rotating rod passes through the center. The compensator of the rotating rod is connected to the lower fixing plate. The lower end of the lower fixing plate is fixedly connected to the rotating base.

[0006] As a further improvement of the present invention, the position of the slider of the clamping structure on the balance block is adjusted, and then the height of the fixed body is adjusted by the adjusting body inside the vertical block, so that the lower fixed plate and the rotating base of the fixed body are connected to the center of the slider surface and limit one end of the cylinder. Then the upper fixed plate is adjusted in height by the adjusting body, and then the upper fixed plate fixes the other end of the cylindrical workpiece and allows the rotating rod to carry the compensator into the hollow position inside the cylindrical workpiece for support and limitation. Finally, when the rotating base carries the lower fixed plate and the cylindrical workpiece to rotate, it simultaneously drives the upper fixed plate to rotate on the balance plate.

[0007] As a further improvement of the present invention, the base has two balance blocks and is in a solid, protruding shape to define the position of the clamping structure. The control panel is electrically controlled by wiring to the welding body and the clamping structure.

[0008] As a further improvement of the present invention, the slider moves on the balance block through the slide groove, and the vertical block limits the position of the adjusting body and drives the fixed body to slide up and down for height adjustment.

[0009] As a further improvement of the present invention, the rotating block is connected to the upper end of the adjusting body and carries a support rod for limiting. The pull block of the balance plate is in the form of a protrusion and limits the upper fixed plate, the rotating rod, the compensator and the lower fixed plate to coincide with each other and are on the same vertical line. The lower fixed plate and the rotating base are parallel to each other and are set on the surface of the slider.

[0010] As a further improvement of the present invention, the compensator is provided with a connecting groove, which is opened at the center of the adapter ring. The adapter ring is set at the center of the flexible ring, the edge of the flexible ring is a contact layer, and a rebound structure is provided in the distance between the inner wall of the flexible ring and the adapter ring.

[0011] As a further improvement of the present invention, the connecting groove of the adapter ring is provided with an internal thread pattern and is threadedly fixed to the rotating rod. The flexible ring contacts the inner wall of the cylindrical workpiece through the contact layer, and the rebound structure is distributed at the edge of the adapter ring to support the inner wall of the flexible ring.

[0012] As a further improvement of the present invention, the rebound structure is further provided with a lower connecting block, the upper end of the lower connecting block is connected to a support block and an elastic shaft is mounted on the upper end of the support block, and the upper end of the elastic shaft is connected to an upper connecting block.

[0013] As a further improvement of the present invention, the lower connecting block is connected to the edge of the adapter ring and the position of the elastic shaft is determined by the support block. The upper connecting block of the elastic shaft is on the same vertical line as the lower connecting block and is positioned and connected to the inner wall of the flexible ring.

[0014] As a further improvement of the present invention, the welding body is provided with a height telescopic rod, the upper end of the height telescopic rod is connected to a load-bearing block, the surface of the load-bearing block is connected to a restraining block and a welding host, and a protective plate is mounted on the front of the welding body.

[0015] As a further improvement of the present invention, the height telescopic rod is provided with two sets at the lower end of the load-bearing block and set in a symmetrical orientation. The restraining block of the load-bearing block limits the position of the welding host, so that the welding rod at the center of the welding host is aligned with the center of the protective plate and passes through it.

[0016] As a further improvement of the present invention, the protective plate is also provided with an insert block, the upper end of which is connected to a plate body. A limit frame is provided on the surface of the plate body facing the fixture structure, and a calibration groove is provided in the center of the limit frame. Visual monitors are also mounted on both sides of the plate body surface.

[0017] As a further improvement of the present invention, the insert block is perpendicular to the plate and the limiting frame of the plate determines the position of the calibration groove, the calibration groove is circular, and the vision monitor is distributed on the surface of the plate and communicates with the weld of the cylindrical workpiece of the fixture structure.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses a clamp structure as its foundation. The vertical block of the clamp structure, combined with the adjusting body, adjusts the height of the fixed body, so that the height of the upper fixed plate and the distance between the lower fixed plate of the balance plate match the length of the cylindrical workpiece. After fixing both ends of the cylinder, the compensator is inserted into the cylinder for hollow support by the rotating rod at the center of the upper fixed plate. This prevents misfitting due to inconsistent lengths and vibration displacement caused by the hollow interior of the cylindrical workpiece during rotary welding. Therefore, it improves the adaptability of the device and enhances the accuracy and stability during rotary welding.

[0019] 2. The present invention, after the improvement of the compensator, avoids surface scratches after the contact layer comes into contact with the inner wall of the cylindrical workpiece through the cooperation of the flexible ring. It ensures that the inner wall of the cylindrical workpiece can be protected after the internal hollow position is supported and compensated. Then, according to the cooperation of the rebound structure, the elastic shaft can be adapted to cylindrical workpieces with different hollow diameters according to the rebound effect. At the same time, the rebound support can ensure the stability of the overall cylindrical workpiece during rotation welding.

[0020] 3. This invention improves the welding main body by using a height telescopic rod at the lower end of the load-bearing block to adjust the height of the welding host, ensuring it is aligned with the weld seam of the cylindrical workpiece. This prevents welding failures caused by inconsistent heights. Simultaneously, the protective plate prevents welding slag and dust from contaminating the control panel and welding host. A visual monitor then provides real-time monitoring of the welding position, transmitting the image to the control panel for safe observation. Furthermore, the calibration groove in the center of the protective plate limits the welding rod's position, preventing positional deviations due to length variations and further improving welding accuracy. Attached Figure Description

[0021] Figure 1 This is a structural diagram of an automatic rotary welding fixture.

[0022] Figure 2 This is a three-dimensional structural diagram of an improved clamping structure.

[0023] Figure 3 This is a schematic diagram of a three-dimensional structure after an improvement on a fixed body.

[0024] Figure 4 This is a top-view structural diagram of an improved compensator.

[0025] Figure 5 This is a cross-sectional schematic diagram of a modified rebound structure.

[0026] Figure 6 This is a three-dimensional structural diagram of an improved welding body.

[0027] Figure 7 This is a cross-sectional structural diagram of an improved protective plate.

[0028] In the diagram: Base-1, Balance block-2, Fixture structure-3, Control panel-4, Welding body-5; Slide rail-31, slider-32, vertical block-33, adjusting body-34, fixed body-35; Rotating block-351, balance plate-352, pull block-353, upper fixed plate-354, rotating rod-355, compensator-356, lower fixed plate-357, rotating base-358; Connecting groove-3561, adapter ring-3562, flexible ring-3563, contact layer-3564, rebound structure-3565; Lower connecting block-5651, support block-5652, elastic shaft-5653, upper connecting block-5654; 51. Height telescopic pole, 52. Load-bearing block, 53. Restraining block, 54. Welding host, 55. Protective plate; Insert block-551, plate body-552, limit frame-553, calibration slot-554, vision monitor-555. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings: Example 1: Figures 1 to 5 As shown: This invention provides an automatic rotary welding fixture device. Its structure includes: a base 1, a counterweight 2, a clamping structure 3, a control panel 4, and a welding body 5. The upper end of the base 1 is positioned by the counterweight 2 to limit the position of the clamping structure 3. The welding body 5 on the other side of the surface of the base 1 carries the control panel 4 and is on the same horizontal straight line as the clamping structure 3.

[0030] The fixture structure 3 is provided with a sliding groove 31, a slider 32, a vertical block 33, an adjusting body 34, and a fixing body 35. The sliding groove 31 and the slider 32 are integrated, and the interior of the vertical block 33 on the upper side overlaps and contacts the adjusting body 34. The upper side of the adjusting body 34 is fixedly connected to the fixing body 35.

[0031] The fixing body 35 is further provided with a rotating block 351, a balance plate 352, a pull block 353, an upper fixing plate 354, a rotating rod 355, a compensator 356, a lower fixing plate 357, and a rotating base 358. The rotating block 351 is located on the side of the balance plate 352. The balance plate 352 drives the rotating block 351 to rotate through the pull block 353. The upper fixing plate 354 is located at the center of the balance plate 352 and allows the rotating rod 355 to pass through the center. The compensator 356 of the rotating rod 355 is connected to the lower fixing plate 357. The lower end of the lower fixing plate 357 is fixedly connected to the rotating base 358.

[0032] In this process, the slider 32 of the clamping structure 3 is positioned on the balance block 2, and then the adjusting body 34 inside the vertical block 33 adjusts the height of the fixed body 35, so that the lower fixed plate 357 and the rotating base 358 of the fixed body 35 are connected to the center of the surface of the slider 32 and limit one end of the cylinder. Then, the upper fixed plate 354 is height adjusted by the adjusting body 34, and then the upper fixed plate 354 fixes the other end of the cylindrical workpiece and allows the rotating rod 355 to carry the compensator 356 into the hollow position inside the cylindrical workpiece for support and limitation. Finally, when the rotating base 358 carries the lower fixed plate 357 and the cylindrical workpiece to rotate, it simultaneously drives the upper fixed plate 354 to rotate on the balance plate 352.

[0033] The base 1 has two balance blocks 2, which are solid and protruding to define the position of the clamping structure 3. The control panel 4 is connected to the welding body 5 and the clamping structure 3 for electric control via wiring.

[0034] The slider 32 moves on the balance block 2 via the slide groove 31, and the vertical block 33 limits the position of the adjusting body 34 and drives the fixed body 35 to slide up and down for height adjustment.

[0035] The rotating block 351 is connected to the upper end of the adjusting body 34 and carries a support rod for limiting. The pull block 353 of the balance plate 352 is in the form of a protrusion and limits the upper fixed plate 354, the rotating rod 355, and the compensator 356 to coincide with the center of the lower fixed plate 357, which are on the same vertical line. The lower fixed plate 357 and the rotating base 358 are parallel to each other and are set on the surface of the slider 32.

[0036] The compensator 356 is provided with a connecting groove 3561, which is opened at the center of the adapter ring 3562. The adapter ring 3562 is located at the center of the flexible ring 3563. The edge of the flexible ring 3563 is a contact layer 3564, and a rebound structure 3565 is provided in the distance between the inner wall of the flexible ring 3563 and the adapter ring 3562.

[0037] The adapter ring 3562 has an internal thread at the connecting groove 3561 and is threadedly fixed to the rotating rod 355. The flexible ring 3563 is in contact with the inner wall of the cylindrical workpiece through the contact layer 3564. The rebound structure 3565 is distributed at the edge of the adapter ring 3562 to support the inner wall of the flexible ring 3563.

[0038] The rebound structure 3565 is further provided with a lower connecting block 5651. The upper end of the lower connecting block 5651 is connected to a support block 5652, and the upper end of the support block 5652 is equipped with a spring shaft 5653. The upper end of the spring shaft 5653 is connected to an upper connecting block 5654.

[0039] The lower connecting block 5651 is connected to the edge of the adapter ring 3562 and the position of the elastic shaft 5653 is determined by the support block 5652. The upper connecting block 5654 of the elastic shaft 5653 is on the same vertical line as the lower connecting block 5651 and is positioned and connected to the inner wall of the flexible ring 3563.

[0040] The specific functions and operation procedures of this embodiment are as follows: In this invention, the automatic rotary welding fixture device positions the clamping structure 3 and the welding body 5 via the base 1 and the balance block 2. Subsequently, the control panel 4 of the welding body 5 electrically controls the clamping structure 3 and the welding body 5, causing the slider 32 of the clamping structure 3 to move on the balance block 2 via the slide groove 31, allowing the cylindrical workpiece to be embedded in the fixed body 35. Furthermore, the vertical block 33 can adjust the height of the fixed body 35 by sliding the adjusting body 34 up and down, matching its length to the cylindrical workpiece, so that the rotating base 358 of the fixed body 35... After the lower fixed plate 357 is positioned, when one end of the cylindrical workpiece is embedded in the lower fixed plate 357, the balance plate 352 uses the orientation adjustment of the rotating block 351 and the height adjustment of the adjusting body 34 to make the upper fixed plate 354 cover the other end of the cylindrical workpiece. Then, through the electrical control effect of the control panel 4, the rotating rod 355 carries the compensator 356 into the hollow position inside the cylindrical workpiece for support, avoiding the welding instability caused by the hollow interior. Therefore, by adjusting the height, the device can be made to fit the length of each cylindrical workpiece, while simultaneously supporting the internal structure. To prevent welding instability caused by hollowness, the rotating base 358 is activated, causing the lower fixed plate 357 to rotate, allowing the welding body 5 to stably weld the weld seam of the cylindrical workpiece. The flexible ring 3563 of the compensator 356 connects to the surface of the rotating rod 355 through the connecting groove 3561 of the central adapter ring 3562, and then contacts the inner wall of the cylindrical workpiece through the contact layer 3564. Finally, the rebound effect of the rebound structure 3565 provides support and coverage, improving the compensation and stability of the hollow interior of the cylindrical workpiece. Therefore, after the rebound structure 3565 installs the support block 5652 on the edge of the adapter ring 3562 according to the lower connecting block 5651, the upper connecting block 5654 of the elastic shaft 5653 at the upper end of the support block 5652 is connected to the inner wall of the flexible ring 3563. Through the compression and rebound effect of the elastic shaft 5653, it can be adapted to various cylindrical workpieces with inconsistent internal hollow dimensions. At the same time, the rebound effect can increase the support and stability effect, achieving the effect of easy support and disengagement, avoiding the mismatch caused by inconsistent internal hollow dimensions of the cylindrical workpieces.

[0041] Example 2: Figures 6 to 7 As shown: This invention provides an automatic rotary welding fixture device. Its structure includes a height telescopic rod 51 on the welding body 5, a load-bearing block 52 connected to the upper end of the height telescopic rod 51, a restraining block 53 and a welding host 54 connected to the surface of the load-bearing block 52, and a protective plate 55 mounted in front of the welding body 54.

[0042] The height telescopic rod 51 is provided in two sets at the lower end of the load-bearing block 52 and is set in a symmetrical position. The restraining block 53 of the load-bearing block 52 limits the position of the welding host 54, so that the welding rod in the center of the welding host 54 is aligned with the center of the protective plate 55 and passes through it.

[0043] The protective plate 55 is also provided with a plug 551. The upper end of the plug 551 is connected to the plate body 552. The plate body 552 is provided with a limit frame 553 facing the fixture structure 3. The center of the limit frame 553 is provided with a calibration groove 554. Visual monitors 555 are also mounted on both sides of the surface of the plate body 552.

[0044] The insert 551 is perpendicular to the plate 552, and the limiting frame 553 of the plate 552 determines the position of the calibration groove 554. The calibration groove 554 is circular. The vision monitor 555 is distributed on the surface of the plate 552 and communicates with the weld of the cylindrical workpiece of the fixture structure 3.

[0045] The specific functions and operation procedures of this embodiment are as follows: In this invention, the height of the load-bearing block 52 of the welding main body 5 can be adjusted by the control panel 4 through two sets of height telescopic rods 51 at the lower end. This avoids the situation where welding cannot be performed due to a mismatch between the height of the welding host 54 and the weld height of the cylindrical workpiece. Furthermore, the restraining block 53 at the upper end of the load-bearing block 52 can limit the welding host 54, achieving the effect of linear movement for easy replacement of welding rods. Subsequently, the protective plate 55 can prevent the intrusion and contamination of welding slag during welding, improving the protection effect on the welding host 54 and the control panel 4. Then, the plate body 552 of the protective plate 55 can be inserted... Block 551 completes the connection with the load-bearing block 52, and then the limiting frame 553 of the plate 552 can pass through the calibration groove 554 to limit the welding rod, so as to achieve a precise and stable welding effect and avoid the shaking caused by the edge hollowing. Then, the visual monitor 555 on the surface of the plate 552 can monitor the cylindrical workpiece at the position of the fixture structure 3 in real time, and feed the image back to the control panel 4 to replace the original direct visual inspection of the cylindrical workpiece of the fixture structure 3. Therefore, it can improve the safety factor during automatic rotary welding and improve the multi-functional use effect of the device.

[0046] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solutions described in this invention, or by designing similar technical solutions by those skilled in the art under the inspiration of the technical solutions described in this invention, falls within the protection scope of this invention.

Claims

1. An automatic rotary welding fixture, the structure of which includes: The base (1), balance block (2), clamping structure (3), control panel (4), and welding body (5) are described. The upper end of the base (1) is positioned by the balance block (2) to limit the position of the clamping structure (3). The welding body (5) on the other side of the surface of the base (1) carries the control panel (4) and is on the same horizontal straight line as the clamping structure (3). The base (1) is characterized by the following: The clamp structure (3) is provided with a slide groove (31), a slider (32), a vertical block (33), an adjusting body (34), and a fixing body (35). The slide groove (31) and the slider (32) are integrated, and the interior of the vertical block (33) on the upper side overlaps and contacts the adjusting body (34). The upper side of the adjusting body (34) is fixedly connected to the fixing body (35). The fixed body (35) is also provided with a rotating block (351), a balance plate (352), a pull block (353), an upper fixed plate (354), a rotating rod (355), a compensator (356), a lower fixed plate (357), and a rotating base (358). The rotating block (351) is located on the side of the balance plate (352). The balance plate (352) drives the rotating block (351) to rotate through the pull block (353). The upper fixed plate (354) is located at the center of the balance plate (352) and the rotating rod (355) passes through the center. The compensator (356) of the rotating rod (355) is connected to the lower fixed plate (357). The lower end of the lower fixed plate (357) is fixedly connected to the rotating base (358). The position of the slider (32) of the clamping structure (3) on the balance block (2) is adjusted, and then the adjustment body (34) inside the vertical block (33) adjusts the height of the fixed body (35) so that the lower fixed plate (357) and the rotating base (358) of the fixed body (35) are connected to the center of the surface of the slider (32) and limit one end of the cylinder. Then the upper fixed plate (354) is adjusted in height through the adjustment body (34), and then the upper fixed plate (354) fixes the other end of the cylindrical workpiece and allows the rotating rod (355) to carry the compensator (356) into the hollow position inside the cylindrical workpiece for support and limitation. Finally, when the rotating base (358) carries the lower fixed plate (357) and the cylindrical workpiece to rotate, it simultaneously drives the upper fixed plate (354) to rotate on the balance plate (352).

2. The automatic rotary welding fixture device according to claim 1, characterized in that: The base (1) has two balance blocks (2) that are solid and protruding to define the position of the clamping structure (3). The control panel (4) controls the welding body (5) and the clamping structure (3) electrically via wiring.

3. The automatic rotary welding fixture device according to claim 1, characterized in that: The slider (32) moves on the balance block (2) through the slide groove (31), and the vertical block (33) limits the position of the adjusting body (34) and drives the fixed body (35) to slide up and down for height adjustment.

4. The automatic rotary welding fixture device according to claim 1, characterized in that: The rotating block (351) is connected to the upper end of the adjusting body (34) and carries a support rod for limiting. The pull block (353) of the balance plate (352) is in a protruding shape and limits the upper fixed plate (354), rotating rod (355), compensator (356) to coincide with the center of the lower fixed plate (357) and are on the same vertical line. The lower fixed plate (357) and rotating base (358) are parallel to each other and are set on the surface of the slider (32).

5. The automatic rotary welding fixture device according to claim 1, characterized in that: The compensator (356) is provided with a connecting groove (3561), which is opened at the center of the adapter ring (3562). The adapter ring (3562) is located at the center of the flexible ring (3563). The edge of the flexible ring (3563) is a contact layer (3564), and a rebound structure (3565) is provided in the distance between the inner wall of the flexible ring (3563) and the adapter ring (3562). The adapter ring (3562) has an internal thread at the connecting groove (3561) and is threadedly fixed to the rotating rod (355). The flexible ring (3563) contacts the inner wall of the cylindrical workpiece through the contact layer (3564). The rebound structure (3565) is distributed at the edge of the adapter ring (3562) to support the inner wall of the flexible ring (3563).

6. The automatic rotary welding fixture device according to claim 5, characterized in that: The rebound structure (3565) is also provided with a lower connecting block (5651), the upper end of the lower connecting block (5651) is connected to a support block (5652) and the upper end of the support block (5652) is equipped with an elastic shaft (5653), and the upper end of the elastic shaft (5653) is connected to an upper connecting block (5654). The lower connecting block (5651) is connected to the edge of the adapter ring (3562) and the position of the elastic shaft (5653) is determined by the support block (5652). The upper connecting block (5654) of the elastic shaft (5653) is on the same vertical line as the lower connecting block (5651) and is positioned and connected to the inner wall of the flexible ring (3563).

7. The automatic rotary welding fixture device according to claim 1, characterized in that: The welding body (5) is provided with a height telescopic rod (51), and a load-bearing block (52) is connected to the upper end of the height telescopic rod (51). A restraining block (53) and a welding host (54) are connected to the surface of the load-bearing block (52). A protective plate (55) is mounted in front of the welding body (54). The height telescopic rod (51) has two sets at the lower end of the load-bearing block (52) and is set in a symmetrical position. The restraining block (53) of the load-bearing block (52) limits the position of the welding host (54) so ​​that the welding rod in the center of the welding host (54) is aligned with the center of the protective plate (55) and passes through it.

8. An automatic rotary welding fixture device according to claim 7, characterized in that: The protective plate (55) is also provided with a plug (551), the upper end of the plug (551) is connected to a plate body (552), the surface of the plate body (552) facing the clamp structure (3) is provided with a limit frame (553), the center of the limit frame (553) is provided with a calibration groove (554), and visual monitors (555) are also mounted on both sides of the surface of the plate body (552). The insert (551) is perpendicular to the plate (552) and the limiting frame (553) of the plate (552) determines the position of the calibration groove (554). The calibration groove (554) is circular in shape. The visual monitor (555) is distributed on the surface of the plate (552) and communicates with the cylindrical workpiece weld of the fixture structure (3).

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