Process method for welding bottom plate and square tube of small hanging basket

Abstract

The invention discloses a technological method for welding a bottom plate and square tubes of a small hanging basket, and relates to the technical field of square tube welding, and the technological method comprises the steps that nine numbers are arranged on a bottom plate body, nine square tubes are welded at the positions corresponding to the numbers, the positions of the square tubes with the numbers 1, 3, 5, 7, 9 and 5 are not treated, welding is conducted firstly during welding, and then welding is conducted; square holes are formed in the second, fourth, sixth, eighth and fourth positions on the bottom plate body, the positions of the square holes are concentric with the square pipes, welding is carried out in the square holes in the bottom of the bottom plate body, argon tungsten-arc welding is used for single-face welding and double-face forming, welding is completed, four blocking plates are placed on the bottom plate body according to the positions of the square holes, the size of the blocking plates is the same as that of the square holes, and the blocking plates are installed and leveled; the bottom of the bottom plate body is subjected to fillet weld welding, weld joints are ground down after welding, the four L-shaped limiting plates are arranged on the top face of the bottom plate body and used for preventing the bottoms of the square pipes from being collided, through the design, butt joint or fillet weld joints can be achieved from the interior, full penetration welding is achieved, and the internal defect probability is reduced.

Description

Technical Field

[0001] This invention relates to the field of square tube welding technology, and in particular to a process method for welding the bottom plate of a small suspended platform to a square tube. Background Technology

[0002] Small suspended platforms, also known as engineering machines, are used in nuclear power plants to store spent fuel. Nuclear power plants generate electricity through the fission reaction of fuel assemblies. After a period of time, as the uranium in the fuel rods is consumed, the fuel assemblies can no longer meet the power requirements of the power plant and will be removed from the reactor core, becoming spent fuel.

[0003] Square tube is a term used to refer to square and rectangular tubes, which are steel pipes with equal or unequal side lengths. They are made from strip steel through a process of rolling. Generally, the strip steel is unpacked, flattened, rolled, and welded to form a round tube, which is then rolled into a square tube and cut to the required length.

[0004] In the existing technology, argon arc welding is generally used to weld the gaps in the pipes during the welding process to form the pipes. However, the square tubes required for the suspended platform structure are arranged closely together, and the gaps between the square tubes are too small to be welded. Summary of the Invention

[0005] To address the issue of tight arrangement of square tubes making welding impossible, this application provides a process method for welding the base plate of a small suspended platform to square tubes.

[0006] The welding process between the base plate and the square tube of the small suspended platform provided in this application adopts the following technical solution: The process for welding the base plate of a small suspended platform to a square tube includes the following steps: S1. Set nine numbers on the base plate body, and weld nine square tubes at the corresponding positions of the numbers. For the square tubes numbered one, three, five, seven, and nine, no treatment is required. When welding, weld the square tubes at these five positions first. The square tubes at the above five positions can be welded in one week. S2. Square holes are made at positions numbered two, four, six, and eight on the base plate body. The positions of the square holes are concentric with the square tubes, and the inner dimensions of the square holes are the same as the inner dimensions of the square tubes. At the same time, a C1 chamfer is processed at the welding point with the square tubes. S3. Welding of the square tube to the base plate body: Welding is carried out from the square holes 1, 2, 3 and 4 at the bottom of the base plate body. Tungsten inert gas welding is used for welding. Single-sided welding is used for double-sided forming to complete the square tube welding. S4. For the square hole positions, place four blocking plates from the base plate body. The size of the blocking plates is the same as that of square hole one, square hole two, square hole three, and square hole four. Install the blocking plates and adjust their positions. Make fillet welds on the bottom and grind the welds smooth after welding. S5. Four L-shaped limiting plates are set on the top surface of the base plate to prevent the bottom of the square tube from being bumped.

[0007] By adopting the above technical solution, the L-shaped limiting plate provides a positioning reference for the installation of square tubes on the base plate, ensuring that the square tubes are accurately placed in the designated positions and guaranteeing the relative position accuracy of each component before welding. The square tubes numbered one, three, five, seven, and nine are welded first to form a preliminary structural framework, providing stable support and positioning reference for the subsequent welding of other square tubes. The square holes provide operating space for welding from the bottom of the base plate, allowing the welding torch to reach the welding area smoothly. The C1 chamfer reduces welding stress concentration, improves the quality of the weld joint, facilitates welding operations, and reduces welding defects. TIG welding has the advantages of stable arc, concentrated heat, and high welding quality. Single-sided welding with double-sided forming reduces welding workload, improves welding efficiency, and ensures weld quality. The blocking plate can seal the square holes to prevent debris from entering the basket, while enhancing the overall structure and sealing. Fillet welds ensure a firm connection between the blocking plate and the base plate. Grinding the weld after welding improves surface quality, makes the basket more aesthetically pleasing, and reduces stress concentration caused by uneven welds. The L-shaped limiting plate is used to prevent the bottom of the square tubes from being bumped.

[0008] Preferably, the distance between the square tubes is 12mm, and the wall thickness of the square tubes is 1.2mm.

[0009] By adopting the above technical solution, the 12mm distance between the square tubes can ensure that the suspended platform structure has sufficient strength and stability, while avoiding problems such as welding difficulties and mutual influence of heat-affected zones caused by too small a distance. The 1.2mm wall thickness of the square tubes can control material costs and weight while meeting the load-bearing requirements of the suspended platform, so that the suspended platform has sufficient strength and is easy to handle and install.

[0010] Preferably, the outer surface of the square tube is provided with a spacer plate, and a stainless steel cladding is welded onto the square tube.

[0011] By adopting the above technical solutions, the spacer plate can ensure the accurate and stable distance between the square tubes, prevent the square tubes from shifting relative to each other due to stress during the use of the suspended platform, ensure the structural dimensional accuracy and stability of the suspended platform, and guarantee the normal use and safety performance of the suspended platform. The welded stainless steel cladding can improve the corrosion resistance of the square tubes and extend the service life of the suspended platform, which is especially suitable for suspended platforms used in harsh conditions such as humid and corrosive environments. At the same time, the stainless steel cladding can enhance the appearance quality of the square tubes and make the suspended platform more aesthetically pleasing.

[0012] Preferably, the top surface of the base plate body is provided with an auxiliary mechanism for assisting the welding of the square tube. The auxiliary mechanism includes an auxiliary frame disposed on the top surface of the base plate body. The auxiliary frame is disposed on the outer surface of the L-shaped limiting plate. The interior of the auxiliary frame is provided with a support device for supporting the auxiliary frame. The top surface of the square tube is provided with a fixing device for fixing the square tube.

[0013] By adopting the above technical solution, the auxiliary mechanism is used to assist in the welding of square tubes, improve welding accuracy and efficiency, ensure stable welding quality, and make the welding process more standardized and orderly. The auxiliary frame provides an installation foundation and support frame for the support device. The support device can play an auxiliary support role for the square tube during the welding process, prevent the square tube from deforming or shifting during welding, and ensure welding quality. The fixing device is used to fix the square tube, prevent the square tube from moving during the welding process, and ensure welding quality.

[0014] Preferably, the support device includes a support plate slidably connected inside the auxiliary frame, the outer surface of the support plate having a plurality of insertion holes, and the outer surface of the auxiliary frame having insertion posts adapted to be inserted into the insertion holes.

[0015] By adopting the above technical solution, the support plate is slidably connected inside the auxiliary frame, and the support position can be adjusted. The insertion post is matched with the insertion hole on the outer surface of the support plate. By inserting the insertion post into different insertion holes, the position of the support plate can be fixed, thereby adjusting the support height and position according to different square tube positions and sizes, providing stable support for the square tube, and ensuring the accurate position of the square tube during welding.

[0016] Preferably, the fixing device includes a pressure plate disposed on the top surface of the square tube, and the bottom surface of the pressure plate is provided with plug-in plates adapted to the interior of the four square tubes numbered one, three, seven, and nine. The interior of the pressure plate is provided with a plurality of slots corresponding to the positions of square tubes two, four, six, and eight. The interior of each slot is provided with abutting devices for abutting and fixing square tubes two, four, six, and eight. The top surface of the pressure plate is provided with a driving device for driving the abutting devices to abut against the square tubes.

[0017] By adopting the above technical solution, the pressure plate is installed on the top surface of the square tube. The plug plate is adapted to the inside of the square tubes at positions one, three, seven, and nine, which can initially position and fix part of the square tubes. The slot two corresponds to the positions of square tube two, four, six, and eight, and an abutment device is set inside. The abutment device is driven by the drive device to abut the square tube, thereby achieving further fixation of the square tube.

[0018] Preferably, the driving device includes a reciprocating lead screw rotatably disposed on the top surface of the pressure plate, a nut slidably disposed on the outer surface of the reciprocating lead screw, a plurality of connecting rods disposed on the outer surface of the nut, and a moving block disposed on the bottom surface of each connecting rod.

[0019] By adopting the above technical solution, the reciprocating screw is rotatably set on the top surface of the pressure plate, and the nut is slidably set on its outer surface. By rotating the reciprocating screw, the nut can move up and down. The connecting rod connects the nut (and the moving block), converting the up and down movement of the nut into the up and down movement of the moving block, thereby driving the abutting device to abut against the square tube, realizing the fixing operation of the square tube, making the fixing process more convenient, faster and more accurate.

[0020] Preferably, the abutting device includes an auxiliary plate slidably disposed inside the slot two, the auxiliary plate having a circular hole one slidably connected to the moving block, the bottom of the auxiliary plate being fixedly provided with an abutting frame that abuts against the top surface of the square tube, the bottom surface of the abutting frame being fixedly provided with a connecting plate, and the connecting plate having an expansion device for clamping from inside the square tube.

[0021] By adopting the above technical solution, the auxiliary plate is slidably set inside the slot two, and a circular hole one is opened inside to slide and connect with the moving block. The moving block moves up and down, causing the auxiliary plate to move up and down. The abutment frame is fixed at the bottom of the auxiliary plate and abuts against the top surface of the square tube, initially fixing the square tube. The connecting plate connects the abutment frame and the expansion device. The expansion device clamps from inside the square tube, further enhancing the fixing effect of the square tube and ensuring the stability of the square tube during the welding process.

[0022] Preferably, the expansion device includes a cylinder fixedly connected and communicating inside the connecting plate, the movable block can slide inside the cylinder, a plurality of sliding plates are slidably arranged inside the cylinder, one side of each sliding plate is fixedly provided with an abutment plate for abutting against the inside of the square tube, the other side of each abutment plate is fixedly provided with a plurality of rubber pads, and a return spring is fixedly provided between the abutment plate and the cylinder.

[0023] By adopting the above technical solution, the cylinder is fixedly connected and communicated inside the connecting plate, the moving block can slide inside it, the sliding plate is slidably set inside the cylinder, the abutment plate is fixed on one side of the sliding plate, the rubber pad is fixed on the other side of the abutment plate, the moving block slides and pushes the sliding plate to move, so that the abutment plate and the rubber pad abut from inside the square tube, thereby achieving clamping and fixing of the square tube. The return spring connects the abutment plate and the cylinder, and when the moving block moves in the opposite direction, it can reset the abutment plate, which is convenient for the next fixing operation.

[0024] Preferably, the moving block is a cone shape that is wider at the top and narrower at the bottom.

[0025] By adopting the above technical solution, the moving block is designed as a cone shape that is wider at the top and narrower at the bottom. When it cooperates with the circular hole of the auxiliary plate and the expansion device, it can achieve smooth transmission and gradually increasing clamping force. When the moving block moves downward, its conical surface gradually contacts the relevant components, so that the clamping force increases evenly, avoiding deformation or damage to the square tube due to sudden application of excessive clamping force, while ensuring the stability and reliability of clamping.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. Square tubes 2, 4, 6, and 8 are welded through square holes 1, 2, 3, and 4 on the base plate. At the same time, a C1 chamfer is processed at the weld joint with the square tubes. This design changes the welding path from "fillet welds that cannot be accessed from the outside" to "butt or corner welds that can be accessed from the inside", achieving full penetration welding and reducing the probability of internal defects. The C1 chamfer (45° bevel angle, 1mm right angle side) forms a smooth transition at the weld edge, avoiding stress concentration at the right angle.

[0027] 2. At the beginning of welding, the nine slots on it provide an initial and uniform planar position reference for all square tubes, ensuring the correct positioning of all square tubes on the base plate plane. This is the first guarantee to achieve "mutual parallelism". The pressure plate is precisely positioned with the five welded square tubes through the plug plate, thereby establishing a "virtual reference plane" parallel to the base plate at the top of the structure.

[0028] 3. The expansion mechanism internally supports the four square tubes to be welded, firmly locking them onto the top reference surface. This design ensures that under the thermal stress of welding, the square tubes, which are several meters long, are in the correct position and posture from the bottom, middle to the top, ultimately achieving the requirements of being "perpendicular to the base plate" and "parallel to each other". Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of a partial exploded structure of this application; Figure 3 This is a schematic diagram of the auxiliary frame connection structure in this application; Figure 4 For the purposes of this application Figure 3 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a schematic diagram of a partial exploded structure of this application; Figure 6 This is a schematic diagram of the connection relationship structure of the abutment frame in this application; Figure 7 This is a schematic diagram of the sliding plate connection structure in this application.

[0030] Attached reference numerals: 1. Base plate body; 2. L-shaped limiting plate; 31. Square tube one; 32. Square tube two; 33. Square tube three; 34. Square tube four; 35. Square tube five; 36. Square tube six; 37. Square tube seven; 38. Square tube eight; 39. Square tube nine; 310. Fixed-distance plate; 41. Square Hole One; 42. Square Hole Two; 43. Square Hole Three; 44. Square Hole Four; 5. Auxiliary mechanism; 51. Auxiliary frame; 52. Support plate; 53. Insert post; 54. Insertion hole; 55. Insertion plate; 56. Pressure plate; 57. Reciprocating screw; 58. Nut; 59. Connecting rod; 510. Moving block; 511. Auxiliary plate; 512. Round hole one; 513. Abutment frame; 514. Connecting plate; 515. Cylinder; 516. Sliding plate; 517. Abutment plate; 518. Return spring; 519. Rubber pad. Detailed Implementation

[0031] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0032] This application discloses a process for welding the bottom plate of a small suspended basket to a square tube.

[0033] Example 1 Reference Figure 1 , Figure 2 The process for welding the base plate of a small suspended platform to a square tube includes the following steps: S1. Set nine numbers on the base plate body 1, and weld nine square tubes (31, 32, 33, 34, 35, 36, 37, 38, and 39) at the corresponding positions of the numbers. The distance between the square tubes is 12mm, the wall thickness of the square tubes is 1.2mm, and the outer surface of each square tube is provided with a spacer plate 310. Weld a stainless steel shell on the square tubes. For the square tubes numbered 1, 3, 5, 7, and 9, no treatment is required. When welding, weld square tubes 31, 33, 35, 37, and 39 first. These five square tubes can ensure that the square tubes are completely welded around the circumference. S2. Square holes 41, 42, 43, and 44 are made at four positions numbered 2, 4, 6, and 8 on the base plate body 1. The positions of square holes 41, 42, 43, and 44 are concentric with those of square tubes 32, 34, 36, and 38. The internal dimensions of square holes 41, 42, 43, and 44 are the same as those of square tubes 32, 34, 36, and 38. At the same time, a C1 chamfer of 45° is processed at the weld joints of square holes 41, 42, 43, and 44 with square tubes 32, 34, 36, and 38, with a right angle of 1mm, to form a smooth transition at the weld edge and avoid stress concentration at the right angle. S3, square tube 2 32, square tube 4 34, square tube 6 36, square tube 8 38 are welded to the base plate body 1. Welding is carried out from the square holes 1 41, 2 42, 3 43, and 44 at the bottom of the base plate body 1. Tungsten inert gas welding is used for welding. Single-sided welding is used for double-sided forming to complete the square tube welding. S4. For square holes 1 41, 2 42, 3 43, and 44, place four blocking plates from the bottom. The size of the blocking plates is the same as that of square holes 1 41, 2 42, 3 43, and 44. Install the blocking plates and level their positions. Make fillet welds on the bottom and grind the welds smooth after welding. S5. Four L-shaped limiting plates 2 are set on the top surface of the base plate body 1. The L-shaped limiting plates 2 are used to prevent the bottom of the square tube from being bumped.

[0034] Example 2 Reference Figure 3 , Figure 4 An auxiliary mechanism 5 is provided on the top surface of the base plate body 1. The auxiliary mechanism 5 is used to assist in the welding of square tubes. The auxiliary mechanism 5 includes an auxiliary frame 51, which is slidably connected to the outer surface of the L-shaped limiting plate 2. The top surface of the auxiliary frame 51 has nine slots, which are slidably adapted to the nine square tubes, allowing the square tubes to slide within the slots. Support devices are provided on the four sides of the auxiliary frame 51. The support devices are used to support the auxiliary frame 51. The support devices include a support plate 52, which is slidably connected to the inside of the auxiliary frame 51. The side of the support plate 52 away from the auxiliary frame 51 can be fixed to the top surface of the base plate body 1 by bolts. The outer surface of the support plate 52 has several insertion holes 54, which are arranged in a linear array. The outer surface of the auxiliary frame 51 is slidably connected to the insertion post 53. The insertion post 53 is connected to the auxiliary frame 51 at a right angle, and the insertion post 53 is inserted into the insertion hole 54.

[0035] In use, the support plate 52 is fixed to the top surface of the base plate body 1 with bolts. When the position of the auxiliary frame 51 needs to be adjusted, the insert post 53 is pulled out, and then the position of the auxiliary frame 51 can be moved up and down. After the adjustment is completed, the insert post 53 is inserted into the corresponding insertion hole 54 to fix the position of the auxiliary frame 51. The position of the nine square tubes can be initially defined by the auxiliary frame 51, providing an initial and unified planar position reference for all square tubes, ensuring the correct positioning of all square tubes on the plane of the base plate body 1. This is the first guarantee to achieve "mutual parallelism". After defining the position of the nine square tubes, four L-shaped limiting plates 2 are placed at the four ends of the inner wall of the auxiliary frame 51 to protect the square tubes from collision.

[0036] Refer to auxiliary mechanism 5 Figure 7Nine square tubes are equipped with fixing devices on their top surfaces. These devices, including pressure plates 56, are placed on the top surfaces of the square tubes. A connector plate 55 is located on the bottom surface of the pressure plate 56, and it is fitted into the inner walls of four square tubes: 31 (square tube 1), 33 (square tube 33), 37 (square tube 7), and 39 (square tube 9). Several slots 2 are formed inside the pressure plate 56, corresponding to the positions of square tubes 32 (square tube 2), 34 (square tube 4), 36 (square tube 6), and 38 (square tube 8). The slots 2, 32, 34, 36, and 38 can be inserted into the slots. The inner sliding of the second hole is provided with an abutment device inside the slot. The abutment device is used to abut and fix the square tubes 2 32, 4 34, 6 36 and 8 38. The abutment device includes an auxiliary plate 511, which is slidably connected inside the second slot. The auxiliary plate 511 has a circular hole 512 inside, and the moving block 510 can slide inside the circular hole 512. The bottom of the auxiliary plate 511 is fixedly connected to the abutment frame 513, and the abutment frame 513 can abut against the top surface of the square tube. The bottom surface of the inner wall of the abutment frame 513 is fixedly connected to the connecting plate 514. An expansion device is provided inside the connecting plate 514. The expansion device is used to abut from the inside of the square tube. The expansion device includes a cylinder 515, which is fixedly connected to the inside of the connecting plate 514. The moving block 510 can slide inside the cylinder 515. Several sliding plates 516 are slidably arranged inside the cylinder 515. The several sliding plates 516 are arranged in a circumferential array. The number of sliding plates 516 corresponds to the inner wall of the square tube. The part of the sliding plate 516 located inside the insertion plate 55 is set in an arc shape. One side of the sliding plate 516 is fixedly connected to the abutment plate 517. The abutment plate 517 is used to abut from the inside of the square tube. One side of the abutment plate 517 is fixedly connected to several rubber pads 519. The rubber pads 519 are located on the side away from the sliding plate 516. A return spring 518 is fixedly connected to the side of the abutment plate 517 near the cylinder 515. The side of the return spring 518 away from the abutment plate 517 is fixedly connected to the cylinder 515. A driving device is provided on the top surface of the pressure plate 56. The driving device is used to drive the abutment device to abut the square tube. The driving device includes a reciprocating screw 57, which is rotatably connected to the center of the top surface of the pressure plate 56. The outer surface of the reciprocating screw 57 is slidably connected to the nut 58. The nut 58 is provided with a ball bearing and a reverser inside. A guide rod is fixedly connected to the bottom surface of the nut 58 to ensure that the nut 58 moves linearly. Several connecting rods 59 are provided on the outer surface of the nut 58. The several connecting rods 59 are arranged in a circumferential array, and the number of connecting rods 59 is the same as the number of auxiliary plates 511. The bottom surface of each connecting rod 59 is fixedly connected to a moving block 510. The moving block 510 is a cone shape that is wider at the top and narrower at the bottom.

[0037] In use, the position of the pressure plate 56 is defined by inserting the plug plate 55 into the top surface of the corresponding square tube 31, 33, 7, and 9. Then, the reciprocating screw 57 is rotated, which drives the nut 58 to rotate. The rotation of the nut 58 drives the connecting rod 59, which is fixedly connected to the nut 58, to move downward. The movement of the connecting rod 59 drives the moving block 510 to move downward and slide through the round hole 512 inside the cylinder 515, pressing the sliding plate 516 to move outward. This, in turn, drives the abutment plate 517 and the rubber pad 519 to move outward and clamp the inner wall of the square tube, firmly locking it on the top reference surface. This design ensures that under the action of welding thermal stress, the square tube, which is several meters long, is in the correct position and posture from the bottom, middle and top, ultimately achieving the requirements of being "perpendicular to the base plate" and "parallel to each other".

[0038] In this device, the return spring 518 adopts the calculation formula of alloy spring: F=kx, where F is the external force on the spring, k is the spring constant, and x is the deformation of the spring, and the elastic force of the alloy spring is calculated so that it can be used in this device. The base plate body 1, square tube 1 31, square tube 2 32, square tube 3 33, square tube 4 34, square tube 5 35, square tube 6 36, square tube 7 37, square tube 8 38, and square tube 9 39 are all made of 304L stainless steel.

[0039] The implementation principle of the welding process between the base plate of the small suspended basket and the square tube in this application embodiment is as follows: In use, four L-shaped limiting plates 2 are set on the top surface of the base plate body 1, and nine numbers are set on the base plate body 1. Then, the support plate 52 is fixed to the top surface of the base plate body 1 with bolts. When it is necessary to adjust the position of the auxiliary frame 51, the position of the auxiliary frame 51 can be adjusted by inserting and pulling the plug 53. The nine square tubes to be welded can be placed through the slots opened in the auxiliary frame 51. The auxiliary frame 51 can initially limit the position of the nine square tubes, providing an initial position for all square tubes. The unified planar position reference ensures the correct positioning of all square tubes on the plane of the base plate 1, which is the first guarantee to achieve "mutual parallelism". Then, the nine square tubes are placed through the slots opened in the auxiliary frame 51, and square tubes 31, 33, 5, 35, 7, and 9 are welded. After the position of the nine square tubes is defined, four L-shaped limiting plates 2 are placed at the four ends of the inner wall of the auxiliary frame 51 to protect the square tubes from collision. Subsequently, the plug plate 55 is inserted into the top surface of the corresponding square tube 31, square tube 33, square tube 7, and square tube 9 39 to limit the position of the pressure plate 56. Then, the reciprocating screw 57 is rotated, which drives the nut 58 to rotate. The rotation of the nut 58 drives the connecting rod 59, which is fixedly connected to the nut 58, to move downward. The movement of the connecting rod 59 drives the moving block 510 to move downward and slide through the round hole 512 inside the cylinder 515, pressing the sliding plate 516 to move outward. This, in turn, drives the abutment plate 517 and the rubber pad 519 to move outward and clamp the inner wall of the square tube, firmly locking it on this top reference surface to achieve the requirements of being "perpendicular to the bottom plate" and "parallel to each other".

[0040] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A process for welding the base plate of a small suspended platform to a square tube, characterized in that: Includes the following steps: S1. Set nine numbers on the base plate body (1) and weld nine square tubes at the corresponding positions of the numbers. The square tubes at positions one, three, five, seven and nine are not treated. When welding, weld the square tubes at these five positions first. The square tubes at the above five positions can be welded in one week. S2. Square holes are opened at four positions numbered two, four, six and eight on the base plate body (1). The position of the square holes is concentric with the square tube. The inner size of the square holes is the same as the inner size of the square tube. At the same time, C1 chamfer is processed at the welding point with the square tube. S3. Welding of square tube to base plate body (1): Welding is carried out from the square hole one (41), square hole two (42), square hole three (43), and square hole four (44) at the bottom of the base plate body (1). Welding is performed by tungsten inert gas welding. Single-sided welding is double-sided forming to complete the square tube welding. S4. For the square hole position, place four blocking plates from the base plate body (1). The size of the blocking plates is the same as that of square hole one (41), square hole two (42), square hole three (43), and square hole four (44). Install the blocking plates and level their positions. Make fillet welds on the bottom and grind the welds after welding. S5. Four L-shaped limiting plates (2) are set on the top surface of the base plate body (1) to prevent the bottom of the square tube from being bumped.

2. The process method for welding the base plate of the small suspended basket to the square tube according to claim 1, characterized in that: The distance between the square tubes is 12mm, and the wall thickness of the square tubes is 1.2mm.

3. The process method for welding the base plate of the small suspended basket to the square tube according to claim 1, characterized in that: The outer surface of each square tube is provided with a spacer plate (310), and a stainless steel cladding is welded onto the square tube.

4. The process method for welding the base plate of the small suspended basket to the square tube according to claim 1, characterized in that: The top surface of the base plate body (1) is provided with an auxiliary mechanism (5) for assisting the welding of square tubes. The auxiliary mechanism (5) includes an auxiliary frame (51) provided on the top surface of the base plate body (1). The auxiliary frame (51) is provided on the outer surface of the L-shaped limiting plate (2). The interior of the auxiliary frame (51) is provided with a support device for supporting the auxiliary frame (51). The top surface of the square tube is provided with a fixing device for fixing the square tube.

5. The process method for welding the base plate of the small suspended basket to the square tube according to claim 4, characterized in that: The support device includes a support plate (52) slidably connected inside the auxiliary frame (51). The outer surface of the support plate (52) is provided with a plurality of insertion holes (54). The outer surface of the auxiliary frame (51) is slidably provided with insertion posts (53) that are compatible with the insertion holes (54).

6. The process method for welding the base plate of the small suspended basket to the square tube according to claim 5, characterized in that: The fixing device includes a pressure plate (56) set on the top surface of the square tube. The bottom surface of the pressure plate (56) is provided with plug-in plates (55) that are adapted to the inside of the square tubes numbered one, three, seven and nine. The inside of the pressure plate (56) is provided with a number of slots corresponding to the positions of square tubes two (32), four (34), six (36) and eight (38). The inside of the slots is provided with abutting devices for abutting and fixing square tubes two (32), four (34), six (36) and eight (38). The top surface of the pressure plate (56) is provided with a driving device for driving the abutting devices to abut against the square tubes.

7. The process method for welding the base plate of the small suspended basket to the square tube according to claim 6, characterized in that: The driving device includes a reciprocating screw (57) rotatably disposed on the top surface of the pressure plate (56). A nut (58) is slidably disposed on the outer surface of the reciprocating screw (57). A plurality of connecting rods (59) are disposed on the outer surface of the nut (58). A moving block (510) is disposed on the bottom surface of each connecting rod (59).

8. The process method for welding the base plate of the small suspended basket to the square tube according to claim 7, characterized in that: The abutting device includes an auxiliary plate (511) slidably disposed inside the slot two. The auxiliary plate (511) has a circular hole (512) slidably connected to the moving block (510) inside. The bottom of the auxiliary plate (511) is fixedly provided with an abutting frame (513) that abuts against the top surface of the square tube. The bottom surface of the abutting frame (513) is fixedly provided with a connecting plate (514). The connecting plate (514) is provided with an expansion device for clamping from inside the square tube.

9. The process method for welding the base plate of the small suspended basket to the square tube according to claim 8, characterized in that: The expansion device includes a cylinder (515) fixedly connected and communicating inside the connecting plate (514). The moving block (510) can slide inside the cylinder (515). Several sliding plates (516) are slidably arranged inside the cylinder (515). Each sliding plate (516) has a fixed abutment plate (517) on one side for abutting against the inside of the square tube. Several rubber pads (519) are fixedly arranged on the other side of the abutment plate (517). A return spring (518) is fixed between the abutment plate (517) and the cylinder (515).

10. The process method for welding the base plate of the small suspended basket to the square tube according to claim 7, characterized in that: The movable block (510) is a cone shape that is wider at the top and narrower at the bottom.

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