A new welding platform for nozzle ring production

Abstract

The present invention relates to the technical field of nozzle ring welding platforms, and discloses a novel welding platform for nozzle ring production, comprising: a base plate, a cylinder and a mounting frame, wherein the cylinder and the mounting frame are both mounted on the top of the base plate, and the top of the cylinder is fixedly connected to a positioning plate; the first bevel gear and the second bevel gear in the above-mentioned clamping mechanism cooperate with each other, can simultaneously drive the operation of multiple transmission rods, can simultaneously adjust the angles of multiple clamping frames, so that the blades can be debugged according to the needs of the outer ring, and cooperate with the welding equipment to weld multiple blades at one time, reducing the debugging time, reducing the time for fixing the blades, and improving the welding efficiency, while driving the airbag, the clamping plate and the piston rod to cooperate with each other, and automatically complete the locking operation of the adjustment rod during the clamping process, thereby increasing the stability of the blades during welding and improving the welding accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of nozzle ring welding platforms, and in particular relates to a novel welding platform for nozzle ring production. Background Art

[0002] The nozzle ring is a multi-channel tapered structure composed of blades evenly installed circumferentially and with a certain inclination angle. The exhaust gas must pass through the nozzle ring to enter the turbine impeller, which changes the exhaust gas intake angle and makes the turbine end more efficient. Due to different usage requirements, the welding inclination angles of the blades are different. Therefore, when welding the spray ring assembly on the existing welding platform, all blades need to be accurately welded to the side wall of the nozzle ring at the same inclination angle.

[0003] After searching, the Chinese patent "A welding platform for nozzle ring assembly production" authorization announcement number "CN115070305 B" is found. The number of adjusting rods, adjusting sleeves, and clamping blocks is set according to the welding quantity requirements of the blades. According to the radius of the nozzle ring, the adjusting sleeve and the adjusting rod are rotated relative to each other, so that the adjusting rod is adjusted along the inner thread groove of the adjusting sleeve. The length of the adjusting rod and the adjusting sleeve can ensure that the clamping notch of the clamping block is clamped on the side wall of the nozzle ring. At the same time, the adjusting rod is abutted against the annular docking groove of the adjustment seat through the docking block to fix the nozzle ring on the turntable. The same number of clamping blocks is set according to the number of blades to be welded. The clamping blocks clamped on the nozzle ring are used as reference marks for the blade welding position to ensure the uniformity of the welding of all blades. At the same time, the blade to be welded is fixed by a blade fixing mechanism, and the blade fixing mechanism can adjust the welding angle of the blade according to the welding requirements of the blade, so that the blade to be welded can be evenly welded to the outer wall of the nozzle ring according to the use requirements, and the inclination angle of all blades can be ensured to improve the uniformity of the welding platform and meet the welding requirements of the nozzle ring assembly.

[0004] 1. The blades are fixed by using clamping blocks, clamping notches and docking blocks, and the blades and annular components are welded in sequence. However, it is necessary to follow the principle of completing the clamping of one blade first, and then adjusting the position and welding accordingly. This takes a long time, affecting the welding efficiency. At the same time, multiple docking will also increase the welding strength and affect the welding accuracy.

[0005] 2. After the blade angle adjustment is completed, the hinged parts will affect the blade welding operation and the stability is poor.

[0006] Therefore, the present invention designs a new welding platform for nozzle ring production to solve the problems raised in the above background technology. Summary of the Invention

[0007] (1) Technical problems solved

[0008] In response to the deficiencies in the prior art, the present invention provides a new welding platform for nozzle ring production, which has the advantages of being able to clamp and adjust multiple blades at the same time, improving welding efficiency and accuracy, and automatically completing locking during clamping, thereby increasing the stability of the welding process. This solves the problem that the new welding platform for existing nozzle ring production needs to first complete the clamping of one blade, and then perform position adjustment and corresponding welding, which takes a long time and affects welding efficiency. At the same time, multiple docking will also increase welding strength, affecting its welding accuracy and poor stability.

[0009] (2) Technical solution

[0010] In order to achieve the purpose of rapid and accurate welding of the nozzle ring, the present invention provides the following technical solutions:

[0011] A novel welding platform for nozzle ring production comprises a base plate, a cylinder and a mounting frame. The top of the base plate is rotatably connected to a rotating disk, the cylinder is mounted on the top of the rotating disk, the mounting frame is mounted on the top of the base plate, and the top of the cylinder is fixedly connected to a positioning plate.

[0012] The top end face of said sliding arm is fixedly provided with a toothed connecting strip which is cooperatively connected with said toothed connecting gear.

[0013] Based on the above technical features: the mutual cooperation between the first bevel gear and the second bevel gear in the above clamping mechanism can drive the operation of multiple transmission rods at the same time, and can adjust the angles of multiple clamping frames at the same time, so that the blades can be debugged according to the needs of the outer ring, and cooperate with the welding equipment to weld multiple blades at one time, reducing the debugging time, reducing the time for fixing the blades, and improving the welding efficiency.

[0014] As a preferred solution of the new welding platform for nozzle ring production described in the present invention: the clamping mechanism also includes a driving airbag embedded in the other side of the clamping plate, cylinders are provided on both sides of the fixed frame, a piston rod is provided in the cylinder, one end of the piston rod passes through the cylinder and is fixedly connected to a fastening block, and a connecting pipe is provided between the two cylinders and the driving airbag.

[0015] Based on the above technical features: the driving airbag, clamping plate and piston rod cooperate with each other, and during the clamping process, the locking operation of the adjusting rod is automatically completed, thereby increasing the stability of the blade during welding and improving the accuracy of welding.

[0016] As a preferred solution of the new welding platform for nozzle ring production described in the present invention: the top of the positioning plate is fixedly connected to a circular ring, the inner wall of the positioning plate and the outer wall of the circular ring are fixedly connected to evenly distributed electric push rods, and the telescopic end of the electric push rod is fixedly connected to a tightening block.

[0017] Based on the above technical features: the mutual cooperation of the positioning plate and the electric push rod can position the outer ring of the nozzle ring, reduce the difficulty of docking the blades and the outer ring, and improve the accuracy of docking. It only needs to use the cylinder to rise to cooperate with the clamping mechanism.

[0018] As a preferred solution of the new welding platform for nozzle ring production described in the present invention: the bottom end of the mounting frame is fixedly connected to an angle ring, the surface of the rotating rod is fixedly connected to a sliding rod used in conjunction with the angle ring, and the rotating rod is located inside the angle ring.

[0019] Based on the above technical features: the angle ring can provide a reference for rotation, reduce the difficulty of adjustment, and shorten the debugging time.

[0020] As a preferred solution of the novel welding platform for nozzle ring production described in the present invention: a contact pad is provided on the other side of the abutting block, and the contact pad is a rubber material component.

[0021] Based on the above technical features: the rubber contact pad can automatically fit and clamp, thereby increasing the friction between the two and increasing the stability of welding.

[0022] As a preferred solution of the novel welding platform for nozzle ring production described in the present invention: a resistance-increasing sleeve is provided on the surface of the threaded sleeve, and the clamping plate and the clamping frame are slidably connected.

[0023] Based on the above technical features: the resistance-increasing sleeve can increase the friction between the palm and the threaded sleeve, avoid slipping during rotation, and reduce the difficulty of rotation.

[0024] As a preferred solution of the novel welding platform for nozzle ring production described in the present invention: a circular groove is provided at the bottom end of the angle ring, and the other end of the slide rod slides in the circular groove.

[0025] Based on the above technical features: the sliding rod rotates synchronously with the rotating rod, and the sliding rod and the circular groove cooperate with each other to increase the stability of the rotation.

[0026] As a preferred solution of the new welding platform for nozzle ring production described in the present invention: the bottom end of the mounting frame is fixedly connected to a motor, the surfaces of the motor and the rotating rod are fixedly connected to a third bevel gear, and the two third bevel gears are meshed and connected.

[0027] Based on the above technical features: multiple clamping frames can be adjusted at the same time, and the adjustment steps are consistent, there will be no deviation, and the accuracy of welding is improved.

[0028] As a preferred solution of the novel welding platform for nozzle ring production described in the present invention: a spring is fixedly connected between the other end of the piston rod and the inner wall of the cylinder, and the upper end surface of the adjusting rod is a wear-resistant rubber component.

[0029] Based on the above technical features: the spring can provide a reset force for the piston rod, making the clamping mechanism more stable during operation.

[0030] As a preferred solution of the new welding platform for nozzle ring production described in the present invention: the bottom end of the base plate is fixedly connected to a support bracket, and the top end of the support bracket is fixedly connected to compensation blocks that are evenly distributed and match the shape of the bottom of the positioning plate.

[0031] Based on the above technical features: the support bracket and the compensation block cooperate with each other, so that when the outer ring is placed in the early stage, the bottom can be completely sealed, the bottom is relatively stable, and the outer ring is not prone to deviation.

[0032] (3) Beneficial effects

[0033] Compared with the prior art, the present invention provides a new welding platform for nozzle ring production, which has the following beneficial effects:

[0034] 1. The cooperation between the first bevel gear and the second bevel gear in the clamping mechanism can simultaneously drive the operation of multiple transmission rods and adjust the angles of multiple clamping frames at the same time, so that the blades can be debugged according to the needs of the outer ring. In cooperation with the welding equipment, multiple blades can be welded at one time, reducing the debugging time and the time for fixing the blades, improving the welding efficiency. At the same time, the airbag, clamping plate and piston rod are driven to cooperate with each other. During the clamping process, the adjusting rod is automatically locked, which increases the stability of the blades during welding and improves the welding accuracy.

[0035] 2. The cooperation between the positioning plate and the electric push rod can position the outer ring of the nozzle ring, reduce the difficulty of docking the blades and the outer ring, and improve the accuracy of docking. It only needs to use the cylinder to rise to cooperate with the clamping mechanism. At the same time, the support bracket and the compensation block cooperate with each other. When the outer ring is placed in the early stage, the bottom can be completely sealed. The bottom is relatively stable and the outer ring is not easy to deviate. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 This is a schematic diagram of the connection between the base plate and the positioning plate of the present invention;

[0038] Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0039] Figure 4 This is a schematic diagram of the connection between the mounting frame and the clamping mechanism of the present invention;

[0040] Figure 5 This is a schematic structural diagram of the mounting bracket and motor of the present invention;

[0041] Figure 6 It is a structural schematic diagram of the clamping mechanism of the present invention;

[0042] Figure 7 This is a schematic diagram of the connection between the second bevel gear and the clamping frame of the present invention;

[0043] Figure 8 This is a schematic diagram of the connection between the transmission rod and the clamping plate of the present invention;

[0044] Figure 9 This is a schematic diagram of the connection between the driving airbag and the cylinder of the present invention.

[0045] In the figure: 100, base plate; 110, support bracket; 120, compensation block; 200, cylinder; 300, positioning plate; 310, electric push rod; 320, tightening block; 330, contact pad; 340, circular ring; 400, mounting bracket; 410, angle ring; 420, circular groove; 430, slide rod; 500, clamping mechanism; 510, rotating rod; 520, first bevel gear; 521, second bevel gear; 522, transmission rod; 523, first circular gear; 530, fixing frame; 531, adjusting rod; 532, clamping frame; 533, connecting plate; 534, threaded sleeve; 535, screw rod; 536, clamping plate; 540, mounting box; 541, second circular gear; 542, third circular gear; 550, cylinder; 551, spring; 552, piston rod; 553, connecting pipe; 554, driving airbag; 560, motor; 561, third bevel gear. DETAILED DESCRIPTION

[0046] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] See also Figures 1-9 , the present invention provides a technical solution:

[0048] A novel welding platform for nozzle ring production comprises a base plate 100, a cylinder 200, and a mounting bracket 400. The top of the base plate 100 is rotatably connected to a rotating disk, the cylinder 200 is mounted on the top of the rotating disk, the mounting bracket 400 is mounted on the top of the base plate 100, and the top of the cylinder 200 is fixedly connected to a positioning plate 300.

[0049] The clamping mechanism 500 is also included. The clamping mechanism 500 includes a rotating rod 510 rotatably connected to the bottom end of the mounting frame 400. The bottom end of the rotating rod 510 is fixedly connected to a first bevel gear 520. The bottom end of the mounting frame 400 is fixedly connected to a ring-shaped fixed frame 530. The bottom end of the fixed frame 530 is rotatably connected to two adjusting rods 531. The bottom end of the adjusting rod 531 is fixedly connected to a clamping frame 532. A connecting plate 533 is fixedly connected between the two clamping frames 532. One side of the connecting plate 533 is rotatably connected to a threaded sleeve 534. One end of the threaded sleeve 534 is threadedly connected to a screw rod 535. The other end of the screw rod 535 is threadedly connected to the screw rod 535. One end is rotatably connected to a clamping plate 536, and an installation box 540 is fixedly connected to the inner side of the fixing frame 530. The inner wall of the installation box 540 is rotatably connected to the second circular gear 541. The surface of the second circular gear 541 is meshed with the first circular gear 523 and the third circular gear 542 in sequence. Both ends of the first circular gear 523 are fixedly connected to the transmission rod 522. The other end of the transmission rod 522 passes through the installation box 540 and is fixedly connected to the second bevel gear 521 that meshes with the first bevel gear 520. Both ends of the third circular gear 542 pass through the installation box 540 and are fixedly connected to the adjusting rod 531.

[0050] like Figure 4 、 Figure 6 and Figure 9 As shown, the clamping mechanism 500 also includes a driving airbag 554 embedded in the other side of the clamping plate 536. A cylinder 550 is provided on both sides of the fixed frame 530. A piston rod 552 is installed within the cylinder 550. One end of the piston rod 552 extends through the cylinder 550 and is fixedly connected to a fastening block. A connecting pipe 553 is provided between the two cylinders 550 and the driving airbag 554. A spring 551 is fixedly connected between the other end of the piston rod 552 and the inner wall of the cylinder 550. The upper end surface of the adjustment rod 531 is a wear-resistant rubber member. A resistance-enhancing sleeve is provided on the surface of the threaded sleeve 534. The clamping plate 536 and the clamping frame 532 are slidably connected.

[0051] In this embodiment, the palm directly contacts the wear-resistant rubber to rotate the threaded sleeve 534. Under the transmission action of the screw 535, the clamping plate 536 will approach the blade, and at the same time, the clamping plate 536 slides in the clamping frame 532, that is, the conventional slider groove cooperates with each other. Because of the well-known technology, it is not described in detail. The clamping plate 536 will contact the blade and lock it. During the clamping process, the driving airbag 554 will be squeezed, and the gas inside it will enter the cylinder 550 from the connecting pipe 553. The gas drives the piston rod 552 to approach the adjusting rod 531, so that when the clamping plate 536 completes the clamping of the blade, the adjusting rod 531 is automatically locked, thereby increasing the stability of the blade during welding.

[0052] like Figure 1 、 Figure 2 and Figure 3 As shown, a circular ring 340 is fixedly connected to the top of the positioning plate 300. Evenly distributed electric push rods 310 are fixedly connected to the inner wall of the positioning plate 300 and the outer wall of the circular ring 340. The telescopic ends of the electric push rods 310 are fixedly connected to abutment blocks 320. A contact pad 330 made of rubber is provided on the other side of the abutment blocks 320. The bottom end of the base plate 100 is fixedly connected to the support bracket 110. Evenly distributed compensation blocks 120 that match the shape of the bottom of the positioning plate 300 are fixedly connected to the top of the support bracket 110.

[0053] In this embodiment, the compensation block 120 and the support bracket 110 cooperate with each other to compensate for the bottom formation of the positioning plate 300, so that a flat placement surface is formed at the bottom of the positioning plate 300 without affecting the subsequent welding operation. The outer ring in the nozzle ring is placed on the positioning plate 300, and the electric push rod 310 is started. The electric push rod 310 drives the tightening block 320 to contact the outer ring to achieve a stable connection between the outer ring and the positioning plate 300. Finally, the cylinder 200 is started. The cylinder 200 drives the positioning plate 300 and the outer ring to move upward and be spliced ​​with the blade that has been positioned above. After the positioning and splicing are completed, the welding operation is performed.

[0054] like Figure 4 、 Figure 5 and Figure 6 As shown, the bottom end of the mounting frame 400 is fixedly connected to an angle ring 410, and the surface of the rotating rod 510 is fixedly connected to a slide rod 430 for use with the angle ring 410, and the rotating rod 510 is located within the angle ring 410. The bottom end of the angle ring 410 is defined by a circular groove 420, and the other end of the slide rod 430 slides within the circular groove 420. The bottom end of the mounting frame 400 is fixedly connected to a motor 560, and the surfaces of the motor 560 and the rotating rod 510 are both fixedly connected to third bevel gears 561, and the two third bevel gears 561 are meshed and connected.

[0055] In this embodiment, the motor 560 and the two third bevel gears 561 cooperate with each other to simultaneously complete the tilt angle adjustment of multiple clamping frames 532, and the angle ring 410 can provide a reference for rotation, reducing the difficulty of adjustment. At the same time, the sliding rod 430 and the circular groove 420 cooperate with each other to increase the stability of rotation.

[0056] Working principle: First, adjust the clamping mechanism 500 according to the angle at which the blades in the nozzle ring need to be welded, start the motor 560, and under the action of the two third bevel gears 561, the rotating rod 510 rotates, thereby driving the first bevel gear 520 to rotate, thereby driving the multiple second bevel gears 521 to rotate, and the transmission rod 522 rotates in place, thereby driving the first circular gear 523 to rotate in the installation box 540. Under the mutual meshing action of the second circular gear 541 and the third circular gear 542, the third circular gear 542 will drive the adjustment rod 531 to change its tilt, thereby driving the adjustment of the clamping frame 532, and multiple clamping frames 532 complete the adjustment at the same time. When the adjustment is completed, the blade is placed into the clamping frame 532, and the thread is rotated. The sleeve 534, under the action of the screw rod 535, the clamping plate 536 will contact the blade and lock it. During the clamping process, the driving airbag 554 will be squeezed, and the gas inside it will enter the cylinder 550 from the connecting pipe 553. The gas drives the piston rod 552 to approach the adjusting rod 531, so that when the clamping plate 536 completes the clamping of the blade, the adjusting rod 531 is automatically locked to increase the stability of the blade during welding. Then, the outer ring of the nozzle ring is placed on the positioning plate 300, and the electric push rod 310 is used to drive the tightening block 320 to lock the outer ring. Finally, the cylinder 200 is started, and the cylinder 200 drives the positioning plate 300 and the outer ring to move upward to splice with the blade that has been positioned above. After the positioning and splicing are completed, the welding operation is carried out.

[0057] At the same time, after the outer ring and the first set of blades are welded, the positioning plate 300 is rotated to realize the concentric rotation of the outer ring positioning plate 300, and then the new blades are installed on the clamping mechanism 500, and the final welding of the blades and the outer ring is completed at one time. The internal electric push rod 310 can limit the inner edge of the outer ring or other components when welding is required, such as Figure 1 As shown, the rotating disk can rotate on the base plate 100 and is locked with bolts to prevent it from shifting during welding. It can be optionally adjusted according to the welding operation.

[0058] It should be noted that the cylinder 200, electric push rod 310, motor 560, etc. in the above description are all devices with relatively mature applications in existing technologies. The specific models can be selected according to actual needs. At the same time, the cylinder 200, electric push rod 310, and motor 560 can be powered by a built-in power supply or by AC power. The specific power supply method is selected according to the situation and will not be elaborated here.

[0059] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0060] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A new welding platform for nozzle ring production, comprising: A bottom plate (100), a cylinder (200) and a mounting frame (400), wherein the top end of the bottom plate (100) is rotatably connected to a rotating disk, the cylinder (200) is mounted on the top end of the rotating disk, the mounting frame (400) is mounted on the top end of the bottom plate (100), and the top end of the cylinder (200) is fixedly connected to a positioning plate (300); The invention is characterized in that it further includes a clamping mechanism (500), wherein the clamping mechanism (500) includes a rotating rod (510) rotatably connected to the bottom end of the mounting frame (400), the bottom end of the rotating rod (510) is fixedly connected to a first bevel gear (520), the bottom end of the mounting frame (400) is fixedly connected to a ring-shaped fixed frame (530), the bottom end of the fixed frame (530) is rotatably connected to two adjusting rods (531), the bottom end of the adjusting rod (531) is fixedly connected to a clamping frame (532), a connecting plate (533) is fixedly connected between the two clamping frames (532), and one end of the connecting plate (533) is fixedly connected to the bottom end of the fixing frame (530). The side of the fixing frame (530) is rotatably connected to a threaded sleeve (534), one end of the threaded sleeve (534) is threadedly connected to a screw rod (535), and the other end of the screw rod (535) is rotatably connected to a clamping plate (536). The inner side of the fixing frame (530) is fixedly connected to a mounting box (540), and the inner wall of the mounting box (540) is rotatably connected to a second circular gear (541). The surface of the second circular gear (541) is sequentially meshed with a first circular gear (523) and a third circular gear (542). Both ends of the first circular gear (523) are fixedly connected to a transmission rod (522). The transmission rod (522) is fixedly connected to the inner wall of the mounting box (540). The other end passes through the installation box (540) and is fixedly connected to the second bevel gear (521) meshing with the first bevel gear (520), and both ends of the third circular gear (542) pass through the installation box (540) and are fixedly connected to the adjustment rod (531); the clamping mechanism (500) also includes a driving airbag (554) embedded in the other side of the clamping plate (536), and a cylinder (550) is provided on both sides of the fixing frame (530), and a piston rod (552) is provided in the cylinder (550), and one end of the piston rod (552) passes through the cylinder (550) and is fixedly connected to the fastening block, and the two A connecting tube (553) is provided between the cylinder (550) and the driving airbag (554); the top end of the positioning plate (300) is fixedly connected to a circular ring (340); the inner wall of the positioning plate (300) and the outer wall of the circular ring (340) are fixedly connected to evenly distributed electric push rods (310); the telescopic ends of the electric push rods (310) are fixedly connected to a tightening block (320); the bottom end of the mounting frame (400) is fixedly connected to a motor (560); the surfaces of the motor (560) and the rotating rod (510) are fixedly connected to third bevel gears (561); and the two third bevel gears (561) are meshed and connected.

2. A novel welding platform for nozzle ring production according to claim 1, characterized in that: The bottom end of the mounting frame (400) is fixedly connected to an angle ring (410), the surface of the rotating rod (510) is fixedly connected to a sliding rod (430) used in conjunction with the angle ring (410), and the rotating rod (510) is located inside the angle ring (410).

3. A novel welding platform for nozzle ring production according to claim 1, characterized in that: A contact pad (330) is provided on the other side of the pressing block (320), and the contact pad (330) is a rubber material component.

4. A novel welding platform for nozzle ring production according to claim 1, characterized in that: A resistance-increasing sleeve is provided on the surface of the threaded sleeve (534), and the clamping plate (536) and the clamping frame (532) are slidably connected.

5. A novel welding platform for nozzle ring production according to claim 2, characterized in that: A circular groove (420) is provided at the bottom end of the angle ring (410), and the other end of the sliding rod (430) slides in the circular groove (420).

6. A novel welding platform for nozzle ring production according to claim 1, characterized in that: A spring (551) is fixedly connected between the other end of the piston rod (552) and the inner wall of the cylinder (550), and the upper end surface of the adjusting rod (531) is a wear-resistant rubber component.

7. A novel welding platform for nozzle ring production according to claim 1, characterized in that: The bottom end of the base plate (100) is fixedly connected to a support bracket (110), and the top end of the support bracket (110) is fixedly connected to compensation blocks (120) that are evenly distributed and match the shape of the bottom of the positioning plate (300).

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