Welding machine for square tube lining plate

Abstract

The invention relates to a square tube lining plate welding machine, and belongs to the technical field of square tube manufacturing equipment.The square tube lining plate welding machine comprises a rack, lining plate blanking machines are symmetrically arranged on the two sides of the rack, a plurality of transmission rollers are sequentially arranged on the portion, between the two lining plate blanking machines, of the rack, and a steel plate rolls into the position between the two lining plate blanking machines along the transmission rollers; a welding robot is arranged on the machine frame, a plurality of downward pressing oil cylinders are arranged between the upper end of the lining plate discharging machine and the machine frame in the vertical direction, and the lining plate discharging machine is synchronously driven by the downward pressing oil cylinders to move downwards to press a steel plate on the upper side of a transmission roller. According to the automatic lining plate feeding and positioning device, whole-process automation of automatic feeding, positioning and welding of the lining plates is achieved, and the problems that manual operation is low in efficiency, high in labor intensity and poor in positioning precision are solved; the method is particularly suitable for square tube lining plate welding in fabricated building and steel structure manufacturing.

Description

Technical Field

[0001] This invention relates to the field of square tube manufacturing equipment technology, specifically an automated device for welding square tube lining plates. Background Technology

[0002] In the field of prefabricated buildings and steel structure manufacturing, square tubes are common structural components. To improve the strength and precision of butt joints or connections between square tubes, it is often necessary to weld backing plates at specific locations inside the square tubes. These backing plates are usually small rectangular plates that serve to position, support, or reinforce the connection during the welding process.

[0003] Currently, in the welding process of square tube liners, the loading of liners is mostly done manually. Operators need to manually pick up the liners one by one from the material pile and place them into the predetermined welding position inside the square tube. This manual operation method has many drawbacks: First, the production efficiency is low, making it difficult to match the cycle time of automated welding equipment, thus becoming a bottleneck process in the production line; second, the repetitive manual picking and placing of materials is labor-intensive and easily leads to operator fatigue; third, in a fast-paced production environment, the accuracy of manual placement may fluctuate, affecting the subsequent welding quality; in addition, there are safety hazards such as high temperature and arc light near the welding station, and manual operation increases safety risks.

[0004] Existing automated welding equipment is mostly specialized equipment designed for tube sheet welding or simple weld seams, and cannot meet the complex process requirements of square tube liner welding. Some automated equipment is prone to wear during the welding process or cannot achieve precise automated welding. Therefore, developing a dedicated square tube liner welding machine to achieve automatic liner feeding, precise positioning, and high-quality welding is of great significance for improving the production efficiency and quality of square tubes. Summary of the Invention

[0005] This invention overcomes the shortcomings of the existing technology and provides a welding machine for square tube liners, realizing full automation of the entire process of automatic feeding, precise positioning and welding of liners.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a square tube liner welding machine, including a frame, liner feeding machines symmetrically arranged on both sides of the frame, multiple transmission rollers arranged sequentially between the two liner feeding machines, steel plates rolling along the transmission rollers into the space between the two liner feeding machines, a welding robot mounted on the frame, and multiple pressing cylinders arranged vertically between the upper end of the liner feeding machine and the frame, the pressing cylinders synchronously driving the liner feeding machine to move downwards to press the steel plates on the upper side of the transmission rollers, so that the welding robot can weld and fix the liner plates pushed out by the liner feeding machine to the upper sides of the steel plates; The lining plate blanking machine comprises a storage rack and a pushing mechanism, the pushing mechanism is fixedly arranged at one side of the bottom end of the storage rack, and is used for pushing the lining plates stacked in the storage rack out one by one.

[0007] Further, the storage rack comprises a first sliding frame and a second sliding frame arranged in parallel, and a connecting end plate fixedly connected to both ends of the first sliding frame and the second sliding frame, a blanking channel for accommodating the horizontally stacked lining plates is formed between the first sliding frame and the second sliding frame, the width of the blanking channel is slightly larger than the width of a single lining plate, so that the lining plates can smoothly fall without being stuck; The execution end of the pushing mechanism is aligned with the lowermost lining plate in the blanking channel in the horizontal direction, and when the pushing mechanism pushes the lowermost lining plate out horizontally, the lining plates above the lowermost lining plate automatically fall to the position to be pushed out under the action of gravity.

[0008] Further, a feeding port corresponding to the position of the blanking channel is formed on the connecting end plate, the width of the feeding port is consistent with the width of the blanking channel, and the feeding port is used for supplementing the lining plates into the blanking channel. A plurality of connecting reinforcing plates are fixedly connected between the top ends of the first sliding frame and the second sliding frame, and are used for enhancing the overall structural strength of the storage rack.

[0009] Further, a plurality of limiting plates are arranged at intervals along the length direction of the outer side of the first sliding frame, the lower end of the limiting plate extends downward and beyond the bottom surface of the first sliding frame, and is used for limiting the lining plate pushed out by the pushing mechanism, so as to ensure that the lining plate is pushed to the predetermined position. The welding robot is movably arranged on the slide rail assembly driven by the servo motor, avoids the part of the limiting plate which blocks the side surface of the lining plate when the lower end of the limiting plate limits, and performs spot welding on the lining plate and the steel plate.

[0010] Further, a transverse spacing adjusting mechanism is arranged between the lining plate blanking machines, the cylinder body of the down pressing oil cylinder is slidably arranged on the slide rail fixed to the top of the rack through the sliding block fixed thereto, the transverse spacing adjusting mechanism pushes and pulls the lining plate blanking machines to change the spacing between the two, so as to adapt to the welding of steel plates with different widths.

[0011] Further, the end of the transmission roller is provided with a power assembly, the transmission roller is driven to rotate by the power assembly, the steel plate is pushed to feed and is discharged after welding is completed; The power assembly comprises a motor and a transmission chain, and the motor drives all the transmission rollers to rotate synchronously through the transmission chain.

[0012] Further, an auxiliary feeding pulley block is arranged at the feeding port of the rack, the auxiliary feeding pulley block drives the end roller to swing up and down through the power mechanism, and the steel plate placed thereon is placed at the feeding port of the rack. The auxiliary feeding pulley block comprises a hydraulic cylinder and an articulated roller, the hydraulic cylinder drives the roller to swing down from a horizontal position to an inclined position to slide the steel plate into the rack.

[0013] Further, the welding robot controls its movement in three-dimensional space through a servo system, and the welding gun angle of the welding robot is adjustable to adapt to different welding positions. The welding robot is connected with a control system, and the welding path is automatically adjusted according to the width of the steel plate and the position of the backing plate.

[0014] Further, the down-pressing oil cylinder is synchronously controlled through a hydraulic system, so that the two backing plate down-feeders can simultaneously and uniformly press the steel plate. The end of the piston rod of the down-pressing oil cylinder is provided with a pressure sensor, which can monitor the pressing force in real time and feed back to the control system.

[0015] Further, the transverse spacing adjustment mechanism comprises a bidirectional screw rod and a driving motor, the two ends of the bidirectional screw rod are respectively connected with the two backing plate down-feeders, and the driving motor is used to drive the backing plate down-feeders to move towards or away from each other through forward and reverse rotation. The transverse spacing adjustment mechanism is connected with the control system, and the spacing of the backing plate down-feeders is automatically adjusted according to the input width of the steel plate.

[0016] Compared with the prior art, the present application has the beneficial effects that: in the present application, the backing plate down-feeders are symmetrically arranged on both sides of the rack, and a plurality of transmission rollers are arranged between the two backing plate down-feeders. The steel plate enters the welding position through the transmission rollers, the backing plates are stacked in the storage rack of the backing plate down-feeder, and the push-out mechanism pushes the lowermost backing plate to the two sides of the steel plate. The down-pressing oil cylinder moves the backing plate down-feeder downward to press the steel plate, and the welding robot moves along the slide rail assembly to spot weld and fix the backing plate on the steel plate. The transverse spacing adjustment mechanism adjusts the spacing of the backing plate down-feeders to adapt to steel plates of different widths. The power assembly drives the transmission roller to rotate, and the auxiliary feeding pulley block assists the feeding of the steel plate. The steel plate is fed to the transmission roller through the auxiliary feeding pulley block, the transmission roller conveys the steel plate to the welding position. The push-out mechanism of the backing plate down-feeder pushes out the backing plate, the down-pressing oil cylinder presses the steel plate, and the welding robot welds. After welding, the transmission roller sends out the steel plate. The present application realizes full automation, has high automation degree, reduces manual intervention, has high welding precision, and has accurate backing plate positioning; it is suitable for steel plates of different widths and has high universality; the structure is stable and has long service life. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be further described below with reference to the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application.

[0019] Figure 2It is a side view schematic diagram of the present application.

[0020] Figure 3 It is a bottom view schematic diagram of the present application.

[0021] Figure 4 It is a schematic diagram of the internal structure of the present application.

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the present application.

[0023] Figure 6 It is a schematic diagram of the structure of the present application.

[0024] Figure 7 It is a schematic diagram of the three-dimensional structure of the present application.

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the present application.

[0026] Figure 9 It is a schematic diagram of the three-dimensional structure of the present application.

[0027] In the figure: 1 is the frame, 2 is the lining blanking machine, 21 is the storage rack, 211 is the first sliding frame, 212 is the second sliding frame, 213 is the connecting end plate, 214 is the feeding port, 215 is the limiting plate, 216 is the connecting reinforcing plate, 22 is the pushing mechanism, 221 is the mounting plate, 222 is the driving plate, 223 is the cylinder fixing plate, 224 is the connecting rod, 225 is the cylinder, 226 is the L-shaped push piece, 227 is the connecting rod, 228 is the push plate, 229 is the limiting column, 2210 is the guide groove, 3 is the transmission roller, 4 is the sliding rail assembly, 5 is the down pressure cylinder, 6 is the transverse spacing adjusting mechanism, 7 is the sliding rail, 8 is the power assembly, 9 is the auxiliary feeding pulley group. DETAILED DESCRIPTION

[0028] The present application will be further described below in conjunction with specific embodiments.

[0029] As Figures 1-9 shown, the present application is a square tube lining welding machine, which comprises a frame 1, two lining blanking machines 2 are symmetrically arranged on both sides of the frame 1, a plurality of transmission rollers 3 are sequentially arranged on the frame 1 between the two lining blanking machines 2, a steel plate rolls along the transmission rollers 3 into the space between the two lining blanking machines 2, a welding robot (not shown in the figure) is arranged on the frame 1, a plurality of down pressure cylinders 5 are arranged between the upper end of the lining blanking machine 2 and the frame 1 in the vertical direction, the lining blanking machine 2 is synchronously driven to move downward by the down pressure cylinders 5 to press the steel plate on the upper side of the transmission roller 3, which facilitates the welding robot to weld and fix the lining plate pushed out from the lining blanking machine 2 on both sides of the upper end of the steel plate. The structure of the lining blanking machine 2 comprises a storage rack 21 and a pushing mechanism 22, the pushing mechanism 22 is fixedly arranged on one side of the bottom end of the storage rack 21, and is used for pushing the lining plates stacked in the storage rack 21 one by one.

[0030] In the embodiment, the structure of the storage rack 21 comprises a first sliding frame 211 and a second sliding frame 212 arranged in parallel, and a connecting end plate 213 fixedly connected to both ends of the first sliding frame 211 and the second sliding frame 212, a blanking channel for accommodating horizontal stacking of lining plates is formed between the first sliding frame 211 and the second sliding frame 212, and the width of the blanking channel is slightly larger than the width of a single lining plate, so that the lining plates can smoothly fall therein without being stuck; The execution end of the pushing mechanism 22 is aligned with the lowermost lining plate in the blanking channel in the horizontal direction, and when the pushing mechanism 22 pushes the lowermost lining plate horizontally, the lining plates above it automatically fall to the position to be pushed under the action of gravity.

[0031] In the embodiment, the connecting end plate 213 is provided with a feeding port 214 corresponding to the position of the blanking channel, the width of the feeding port 214 is consistent with the width of the blanking channel, and the feeding port 214 is used for supplementing lining plates into the blanking channel.

[0032] In the embodiment, a plurality of limiting plates 215 are arranged on the outer side of the first sliding frame 211 along the length direction, the lower end of the limiting plate 215 extends downward and beyond the bottom surface of the first sliding frame 211, and the limiting plate 215 is used for limiting the lining plate pushed by the pushing mechanism 22 to ensure that it is pushed to the predetermined position.

[0033] In the embodiment, a plurality of connecting reinforcing plates 216 are fixedly connected between the top ends of the first sliding frame 211 and the second sliding frame 212, and the connecting reinforcing plates 216 are used for enhancing the overall structural strength of the storage rack 21.

[0034] In the embodiment, the pushing mechanism 22 comprises: A mounting plate 221 is fixedly arranged on the connecting end plate 213 of the storage rack 21, and the mounting plate 221 and the bottom of the storage rack 21 form a pushing channel with a height slightly larger than the thickness of the lining plate; A cylinder fixing plate 223 is fixedly arranged on the mounting plate 221; A cylinder 225 is horizontally fixed on the cylinder fixing plate 223; A driving plate 222 is movably connected with the piston rod of the cylinder 225 through a vertically arranged connecting rod 224, and is driven by the cylinder 225 to perform horizontal reciprocating motion; A plurality of L-shaped pushers 226 are distributed equidistantly along the length direction of the driving plate 222, and the first end of each L-shaped pusher 226 is movably connected with the driving plate 222, and the middle inflection point is movably connected with the mounting plate 221; A connecting rod 227 is movably connected with the second end of the L-shaped pusher 226; A push plate 228 is movably connected with the other end of the connecting rod 227, and is used for directly pushing the lining plate; And a plurality of guide grooves 2210 are arranged on the push plate 228, and a limiting column 229 is fixed on the mounting plate 221 or the rack, the limiting column 229 is arranged in the guide grooves 2210, so that the push plate 228 is stably horizontally reciprocated along the direction defined by the guide grooves 2210 under the driving of the driving plate 222.

[0035] In the embodiment, the lining plate blanking machine 2 is provided with a transverse spacing adjusting mechanism 6, the cylinder body of the pressing oil cylinder 5 is slidably arranged on the sliding rail 7 fixed on the top of the rack 1 through the sliding block fixed thereon, the transverse spacing adjusting mechanism 6 pushes and pulls the lining plate blanking machine 2 to the two sides to change the spacing between the two, so as to meet the welding requirements of steel plates of different widths; when the lining plate blanking machine 2 moves transversely, the pressing oil cylinder 5 moves synchronously along the sliding rail 7. At least two transverse spacing adjusting mechanisms 6 work synchronously, and a linear bearing is arranged between the lining plate blanking machines 2 between the two transverse spacing adjusting mechanisms 6 for guiding.

[0036] The structure of the transverse spacing adjusting mechanism 6 is that a driving motor drives a bidirectional screw to rotate, so that the lining plate blanking machines 2 on the two sides move synchronously towards or away from each other along the sliding rail 7 until reaching the predetermined position.

[0037] In the embodiment, the end of the transmission roller 3 is provided with a power assembly 8, the transmission roller 3 is driven to rotate through the power assembly 8, the steel plate is pushed to feed and the discharged material after welding is completed. The structure of the power assembly 8 is that the motor drives all the transmission rollers to rotate synchronously through a transmission chain, so that the steel plate is accurately conveyed to the welding station.

[0038] In the embodiment, the feeding port of the rack 1 is provided with an auxiliary feeding pulley set 9, the auxiliary feeding pulley set 9 swings up and down through a power mechanism to swing the steel plate placed thereon at the feeding port of the rack 1. The roller set is in a horizontal position (initial position) to receive the steel plate, then the hydraulic cylinder is extended to push the roller set to tilt downward through a connecting rod mechanism, and the steel plate is smoothly slid into the feeding port of the rack 1 by using the weight of the steel plate.

[0039] In the embodiment, the welding robot is movably arranged on the sliding rail assembly 4 driven by a servo motor, avoids the part of the lining plate side blocked when the limiting plate 215 is limited at the lower end, and performs spot welding and fixing on the lining plate and the steel plate.

[0040] The following will be introduced in detail for the synergistic work and precise control of each functional module of the present application: 1. Equipment preparation stage; The operator first inputs the current production task parameters through the man-machine interface, including steel plate width, lining plate specifications and welding program. The control system automatically calculates the required distance according to the steel plate width, and the transverse distance adjusting mechanism 6 starts to work: the driving motor drives the bidirectional screw to rotate, so that the two lining plate unloading machines 2 move synchronously towards or away from each other along the slide rail 7 until reaching the predetermined position. The position sensor detects the distance value in real time and feeds back to the control system, ensuring the positioning accuracy.

[0041] At the same time, the operator replenishes the lining plate to the storage rack 21 through the feeding port 214. The lining plates are naturally stacked in the unloading channel formed by the first slide 211 and the second slide 212, and the connecting reinforcement plate 216 ensures that the storage rack remains structurally stable even in a full load state.

[0042] 2. Steel plate loading and positioning stage; The steel plate is lifted to the feeding area by the crane, and the auxiliary feeding pulley block 9 starts to work: the roller group is in a horizontal position (initial position) to receive the steel plate, and then the hydraulic cylinder is extended to push the roller group downward through the connecting rod mechanism, and the steel plate is smoothly slid into the feeding port of the rack 1 by using its own weight. The transmission roller 3 starts to rotate under the drive of the power assembly 8, and the motor drives all the transmission rollers to rotate synchronously through the transmission chain, accurately conveying the steel plate to the welding station. The photoelectric sensor detects the position of the steel plate to ensure that its center line coincides with the center line of the equipment.

[0043] 3. Lining plate feeding stage; After the steel plate is in place, the push-out mechanism 22 starts to work: the cylinder 225 pushes the driving plate 222 to move forward, and through the connecting rod 224, it drives the L-shaped paddle 226 to rotate around the middle support. The second end of the L-shaped paddle 226 pushes the push plate 228 along the path defined by the guide slot 2210 through the connecting rod 227. The push plate 228 passes through the push material channel formed by the mounting plate 221 and the bottom of the storage rack to accurately push out the lowermost lining plate. The lower end of the limiting plate 215 ensures that the lining plate is pushed to the predetermined position and maintains an accurate relative position with the edge of the steel plate.

[0044] 4. Pressing and welding stage; After the lining plate is in place, the lower pressure cylinder 5 acts synchronously to move the entire lining plate unloading machine 2 downward, reliably pressing the steel plate on the transmission roller 3 through the limiting plate 215. The pressure sensor monitors the pressing force in real time to ensure that the pressure is uniform and reaches the set value.

[0045] The welding robot (fixed on the slide rail assembly 4, not shown in the figure) moves along the slide rail assembly 4 driven by the servo motor, avoids the interference area of the limiting plate 215 according to the preset program, and performs spot welding fixation on the contact area of the liner plate and the steel plate. During the welding process, the welding robot performs real-time compensation on the path according to the actual position of the liner plate, so as to ensure the accuracy of the welding point position.

[0046] 5, discharging and circulating stage; After the welding is completed, the lower pressing oil cylinder 5 lifts the liner plate discharging machine 2 to reset, and the transmission roller 3 is restarted to send the steel plate with the welded liner plate out of the equipment. At the same time, the liner plates in the storage rack 21 automatically fall one layer under the action of gravity, so as to prepare for the next working cycle. The whole equipment enters the standby state and waits for the next steel plate feeding.

[0047] The unique feature of the present application is its synergistic working mechanism: the linkage design of the transverse spacing adjusting mechanism 6 and the lower pressing oil cylinder 5 ensures that the equipment can still maintain stable pressing effect when adapting to different width steel plates; the planar linkage mechanism design of the pushing mechanism 22 realizes the linear motion of the pushing plate and avoids the swing phenomenon when the cylinder directly pushes; the limiting plate 215 integrates the functions of liner plate positioning and steel plate pressing, which simplifies the structure and improves the precision.

[0048] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A machine for welding square tube liners, characterised in that, The application relates to a steel plate lining machine, which comprises a rack (1), lining plate downfeed machines (2) are symmetrically arranged on both sides of the rack (1), a plurality of transmission rollers (3) are sequentially arranged on the rack (1) between the two lining plate downfeed machines (2), a steel plate rolls along the transmission rollers (3) and enters between the two lining plate downfeed machines (2), a welding robot is arranged on the rack (1), a plurality of downward pressing oil cylinders (5) are arranged between the upper ends of the lining plate downfeed machines (2) and the rack (1) in the vertical direction, the lining plate downfeed machines (2) are synchronously driven to move downwards by the downward pressing oil cylinders (5), the steel plate on the upper side of the transmission rollers (3) is pressed tightly, and the welding robot is convenient to use to weld and fix the lining plate pushed out from the lining plate downfeed machines (2) on the upper end sides of the steel plate. The lining plate downfeed machine (2) comprises a storage rack (21) and a pushing mechanism (22), the pushing mechanism (22) is fixedly arranged on one side of the bottom end of the storage rack (21) and is used for pushing the lining plates stacked in the storage rack (21) out one by one.

2. The square tube liner welding machine of claim 1, wherein, The storage rack (21) comprises first and second sliding frames (211) and (212) which are arranged in parallel and oppositely, and a connecting end plate (213) which is fixedly connected to the two ends of the first and second sliding frames (211) and (212), a downfeed channel for horizontally stacking the lining plates is formed between the first and second sliding frames (211) and (212), the width of the downfeed channel is slightly larger than the width of a single lining plate, so that the lining plates can smoothly fall without being stuck; The execution end of the pushing mechanism (22) is aligned with the lowermost lining plate in the downfeed channel in the horizontal direction, and the lining plates above the lowermost lining plate automatically fall to the position to be pushed out under the action of gravity after the lowermost lining plate is horizontally pushed out by the pushing mechanism (22).

3. The square tube liner welding machine of claim 2, wherein, A feeding port (214) is formed in the connecting end plate (213) at a position corresponding to the downfeed channel, the width of the feeding port (214) is consistent with the width of the downfeed channel, and the feeding port (214) is used for supplementing the lining plates into the downfeed channel; A plurality of connecting reinforcing plates (216) are fixedly connected between the top ends of the first and second sliding frames (211) and (212), and are used for enhancing the overall structural strength of the storage rack (21).

4. The square tube liner welding machine of claim 2, wherein, A plurality of limiting plates (215) are arranged on the outer side of the first sliding frame (211) along the length direction, the lower ends of the limiting plates (215) extend downwards and beyond the bottom surface of the first sliding frame (211), and the limiting plates (215) are used for limiting the lining plate pushed out by the pushing mechanism (22) and ensuring that the lining plate is pushed to the predetermined position; The welding robot is movably arranged on a sliding rail assembly (4) driven by a servo motor, avoids the part of the lining plate blocked by the lower end of the limiting plate (215), and is used for spot welding and fixing the lining plate and the steel plate.

5. The square tube liner welding machine of claim 1, wherein, A transverse spacing adjusting mechanism (6) is arranged between the lining plate downfeed machines (2), the cylinder body of the downward pressing oil cylinder (5) is slidably arranged on a sliding rail (7) fixed to the top of the rack (1) through a sliding block fixed thereto, the transverse spacing adjusting mechanism (6) pushes and pulls the lining plate downfeed machines (2) to the two sides to change the spacing between the two lining plate downfeed machines (2), and the lining plate downfeed machines (2) are adapted to the welding of steel plates with different widths.

6. The square tube liner welding machine of claim 1, wherein, The end of the transmission roller (3) is provided with a power assembly (8), which drives the rotation of the transmission roller (3), pushes the steel plate into the machine and discharges the welded steel plate. The power assembly (8) includes a motor and a transmission chain, which drives all the transmission rollers (3) to rotate synchronously.

7. The square tube liner welding machine of claim 1, wherein, An auxiliary feeding pulley block (9) is arranged at the feeding port of the machine frame (1), which is driven by a power mechanism to swing the end roller up and down, and places the steel plate on the feeding port of the machine frame (1). The auxiliary feeding pulley block (9) includes a hydraulic cylinder and a hinged roller, which drives the roller to swing the horizontally placed steel plate to the inclined position and slide into the machine frame (1).

8. The square tube liner welding machine of claim 1, wherein, The welding robot is controlled by a servo system to move in three-dimensional space, and the welding gun angle of the welding robot is adjustable to adapt to different welding positions. The welding robot is connected with the control system, which automatically adjusts the welding path according to the width of the steel plate and the position of the lining plate.

9. The square tube liner welding machine of claim 1, wherein, The down pressure oil cylinder (5) is controlled synchronously by the hydraulic system to ensure that the lining plate unloader (2) on both sides is pressed down at the same time and uniformly. The piston rod end of the down pressure oil cylinder (5) is provided with a pressure sensor, which monitors the pressing force in real time and feeds back to the control system.

10. The square tube liner welding machine of claim 1, wherein, The transverse spacing adjustment mechanism (6) includes a bidirectional screw and a driving motor, the two ends of the bidirectional screw are connected with the lining plate unloaders (2) on both sides, and the driving motor drives the lining plate unloaders (2) to move towards or away from each other by forward and reverse rotation. The transverse spacing adjustment mechanism (6) is connected with the control system, which automatically adjusts the spacing of the lining plate unloaders (2) according to the input width of the steel plate.

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