Cantilever crane structure for automatic welding machine

Abstract

The utility model discloses an arm support structure for an automatic welding machine. The arm support structure comprises a base, a bottom plate, a rotating assembly, a lifting assembly, an electric push rod, a fixing column, a first support, a second support and a spray gun arm support. A lifting assembly is vertically arranged on the portion, close to the left side, of the upper surface of the bottom plate, an electric push rod is horizontally and transversely arranged at the lifting end of the lifting assembly, and the pushing end of the electric push rod is arranged rightwards and is in threaded connection with the left end of a first support through a flange plate so as to drive the first support to move vertically and transversely. A fixing column is vertically arranged on the upper surface, close to the right side, of the bottom plate, and a second support is vertically arranged on the upper surface of the fixing column; the left end of the spray gun arm support is vertically hinged to the right end of the first support, the middle part of the spray gun arm support is vertically hinged to the upper end of the second support, and the right end of the spray gun arm support horizontally and rightwards extends out of the vertical plane where the right side face of the fixing column is located. According to the utility model, the positioning stability and the positioning precision of the spray gun boom are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding machines, in particular to a boom structure for an automatic welding machine. Background Art

[0002] With the development of society, automatic welding machines have begun to gradually assist manual welding or even replace manual welding, which saves time and effort and improves welding efficiency. However, for existing automatic welding machines, the flexibility of their booms is insufficient and they cannot rotate omnidirectionally; moreover, when the distance between the welding torch and the object to be welded needs to be precisely adjusted and maintained, the movement stability of the existing booms is poor and they cannot meet the welding work requiring high-precision positioning. Therefore, the above problems need to be solved urgently. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a boom structure for an automatic welding machine, which improves the stability and positioning accuracy during the positioning of the spray gun boom through the combined use of a lifting component, an electric push rod, a first bracket and a second bracket.

[0004] To solve the above technical problem, the utility model adopts the following technical solution: A boom structure for an automatic welding machine of the utility model is characterized in that: it includes a base, a bottom plate, a rotating component, a lifting component, an electric push rod, a fixed column, a first bracket, a second bracket and a spray gun boom; the bottom plate is a horizontally arranged square structure and is horizontally and spacedly arranged on the upper surface of the horizontally arranged base and is horizontally rotatably connected to the base through the rotating component; a lifting component is vertically arranged at the left edge of the upper surface of the bottom plate, and an electric push rod is horizontally arranged at the lifting end of the lifting component, the pushing end of the electric push rod faces right and is screwed to the left end of the horizontally arranged first bracket through a flange plate, thereby driving the first bracket to move vertically up and down and horizontally; a fixed column is vertically arranged at the right edge of the upper surface of the bottom plate, and a second bracket is vertically arranged on the upper surface of the fixed column; the left end of the spray gun boom is vertically and hingedly connected to the right end of the first bracket, and the middle part thereof is vertically and hingedly connected to the upper end of the second bracket, and its right end horizontally extends out of the vertical plane where the right side surface of the fixed column is located, so as to position the spray gun boom through the cooperation of the first bracket and the second bracket under the drive of the electric push rod and the lifting component.

[0005] Preferably, the lifting assembly includes a fixed seat, a frame, a second motor, a threaded rod, a guide rail, a slider, and a connecting plate. A fixed seat is horizontally provided at the left edge of the upper surface of the bottom plate, and a hollow rectangular parallelepiped-shaped frame with an open right side is vertically fixed on the upper surface of the fixed seat. Two threaded rods are vertically and symmetrically arranged at intervals in the middle of the interior of the frame. The lower end of each threaded rod is rotatably connected to the inner bottom surface of the frame around its own axis, and the upper end thereof extends vertically upward out of the upper surface of the frame and is respectively linked to the output end of the corresponding second motor. The two second motors are vertically and symmetrically arranged at intervals, and their fixed ends are respectively screwed and fixed to the corresponding positions on the upper surface of the frame to ensure the synchronous operation of the two second motors. Guide rails are vertically and symmetrically arranged in parallel at intervals on the left and right sides of each threaded rod in the interior of the frame, and the upper and lower ends of each guide rail are respectively fixedly connected to the corresponding positions on the inner top surface and the inner bottom surface of the frame. Sliders are sleeved on each threaded rod at intervals along its length. The four sliders are horizontally arranged in the frame, and every two adjacent sliders in the vertical direction are respectively screwed to the corresponding threaded rod and are respectively vertically slidably connected to the corresponding two guide rails. The right sides of the four sliders vertically extend out of the right side of the frame and are respectively fixed to the four right-angle positions on the left side of the vertically and longitudinally arranged connecting plate. Thus, under the drive of the second motor, the connecting plate moves vertically up and down with the slider.

[0006] Preferably, the electric push rod is horizontally arranged in the area surrounded by the four sliders, and its fixed end is screwed and fixed to the middle position of the left side of the corresponding connecting plate. The push end of the electric push rod horizontally extends to the right out of the connecting plate and is screwed and fixed to the left end of the first bracket through a flange plate, thereby driving the first bracket to perform horizontal reciprocating motion.

[0007] Preferably, a waist-shaped groove is vertically and perpendicularly embedded and opened on the left outer side of the frame at the position corresponding to the electric push rod. The waist-shaped groove matches the tail of the electric push rod and penetrates through the left inner side of the frame, thereby ensuring that the frame does not interfere with the vertical up and down movement of the electric push rod along with the connecting plate through the waist-shaped groove. A reinforcing rod is obliquely arranged between the tail of the electric push rod and the corresponding slider. The two ends of each reinforcing rod are respectively fixed to the electric push rod and the corresponding slider, and do not interfere with the vertical up and down movement of the electric push rod and the slider respectively, and respectively fix and strengthen the electric push rod.

[0008] Preferably, the height between the hinge point of the second bracket and the fixed column should ensure that neither the second bracket nor the fixed column interferes with the vertical up-and-down rotation of the spray gun boom; the middle position of the two threaded rods and the hinge point of the second bracket are in the same horizontal plane, and the vertical up-and-down stroke of the connecting plate and the stroke of the driving end of the electric push rod should ensure that the spray gun boom rotates vertically within a range of 120° up and down.

[0009] Preferably, it further includes hydraulic cylinders, universal wheels and legs; the base is a horizontally arranged hollow cuboid structure, and hydraulic cylinders are vertically and symmetrically arranged at the four right angles of its inner bottom surface. The actions of the four hydraulic cylinders are synchronized, and the piston rod of each hydraulic cylinder vertically extends downward from the lower surface of the base and is respectively connected to the corresponding universal wheel; legs are vertically and symmetrically arranged at the four right angles of the lower surface of the base, and each leg is arranged within the square area surrounded by the four universal wheels; when in the upper limit position, the lower end surface of each universal wheel is located above the horizontal plane where the lower end of the corresponding leg is located, and under the drive of the hydraulic cylinder, through the cooperation of the universal wheel and the leg, the switching between the moving state and the welding state is carried out.

[0010] Preferably, the rotating assembly and the four hydraulic cylinders are arranged without interference, and the rotating assembly includes a fixing plate, a gear shaft, a main bevel gear, a driven bevel gear and a first motor; a gear shaft is vertically arranged at the middle position inside the base, the lower end of the gear shaft is rotatably connected to the inner bottom surface of the base, and its upper end vertically extends upward from the upper surface of the base and is coaxially and fixedly connected to the middle position of the lower surface of the bottom plate; a driven bevel gear is horizontally and coaxially sleeved and fixed on the gear shaft relative to the inside of the base, and the driven bevel gear is arranged without interference with the base; a fixing plate matching with it is vertically and longitudinally arranged on one side of the driven bevel gear inside the base, and a first motor is horizontally and transversely arranged inside the base between the driven bevel gear and the fixing plate. The fixed end of the first motor is screwed and fixed to the corresponding side surface of the fixing plate, and its output end is horizontally arranged towards the driven bevel gear and is meshed with the driven bevel gear through the main bevel gear. Then, under the drive of the first motor, through the meshing cooperation of the main bevel gear and the driven bevel gear disc, the gear shaft rotates around its own axis and drives the bottom plate to rotate horizontally.

[0011] Preferably, it further includes a roller group; a plurality of circles of roller groups abutting against the lower surface of the bottom plate are connected and arranged on the upper surface of the base, and the plurality of circles of roller groups are coaxially arranged with the bottom plate and are respectively arranged without interference with the gear shaft; each roller group is conical, and its end close to the gear shaft is the small end and the other end is the large end to adapt to the smaller linear velocity close to the gear shaft when the bottom plate rotates.

[0012] Advantages of the present utility model:

[0013] (1) By the combined use of the lifting assembly, electric push rod, first bracket and second bracket, the present utility model improves the stability and positioning accuracy during the positioning of the spray gun boom;

[0014] (2) By setting the rotating assembly, the spray gun boom can be rotated 360° in all directions, improving its flexibility and wide application range;

[0015] (3) By the combined use of the hydraulic cylinder, universal wheels and legs, the present utility model facilitates the switching between the moving state and the welding state, ensuring the stability during welding. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a structural schematic diagram of a boom structure for an automatic welding machine of the present utility model.

[0018] Figure 2 It is an adjustment schematic diagram of the present utility model.

[0019] Among them, 1 - base; 2 - bottom plate; 3 - hydraulic cylinder; 4 - universal wheels; 5 - legs; 6 - fixing plate; 7 - gear shaft; 8 - main bevel gear; 9 - driven bevel gear; 10 - first motor; 11 - fixing seat; 12 - frame; 13 - second motor; 14 - threaded rod; 15 - guide rail; 16 - slider; 17 - connecting plate; 18 - electric push rod; 19 - reinforcing rod; 20 - fixing column; 21 - spray gun boom; 22 - first bracket; 23 - second bracket; 24 - roller group. Detailed Embodiments

[0020] The technical solutions of the present utility model will be clearly and completely described below through specific embodiments.

[0021] A boom structure for an automatic welding machine of the present utility model includes a base 1, a bottom plate 2, a rotating assembly, a lifting assembly, an electric push rod 18, a fixing column 20, a first bracket 22, a second bracket 23 and a spray gun boom 21; the specific structure is as Figure 1 、 Figure 2As shown in the figure, the bottom plate 2 is a horizontally arranged square structure, and is horizontally and spaced parallelly on the upper surface of the horizontally arranged base 1, and is horizontally rotatably connected to the base 1 through a rotating assembly; on the upper surface of the bottom plate 2 near the left edge, a lifting assembly is vertically provided, and on the lifting end of the lifting assembly, an electric push rod 18 is also horizontally arranged. The pushing end of the electric push rod 18 is set to the right, and is screwed to the left end of the first bracket 22 which is horizontally arranged through a flange plate, thereby driving the first bracket 22 to move vertically up and down and horizontally; on the upper surface of the bottom plate 2 near the right edge, a fixed column 20 is also vertically provided, and on the upper surface of the fixed column 20, a second bracket 23 is also vertically provided; the left end of the spray gun boom 21 is vertically and hinged to the right end of the first bracket 22, and the middle part thereof is vertically and hinged to the upper end of the second bracket 23, and the right end thereof extends horizontally to the right out of the vertical plane where the right side surface of the fixed column 20 is located. Under the drive of the electric push rod 18 and the lifting assembly of the present utility model, through the cooperation of the first bracket 22 and the second bracket 23, the positioning of the spray gun boom 21 is carried out.

[0022] The lifting assembly of the present utility model includes a fixed seat 11, a frame 12, a second motor 13, a threaded rod 14, a guide rail 15, a slider 16 and a connecting plate 17; as Figure 1 、 Figure 2 shown, on the upper surface of the bottom plate 2 near the left edge, a fixed seat 11 is horizontally provided, and on the upper surface of the fixed seat 11, a hollow cuboid-shaped frame 12 with an open right side is vertically fixed; at the middle position inside the frame 12, two threaded rods 14 are vertically symmetrically arranged at intervals front and back. The lower end of each threaded rod 14 is respectively rotatably connected to the inner bottom surface of the frame 12 around its own axis, and the upper end thereof respectively extends vertically upward out of the upper surface of the frame 12 and is respectively linked to the output end of the corresponding second motor 13; the two second motors 13 are vertically symmetrically arranged at intervals front and back, and their fixed ends are respectively screwed and fixed to the corresponding positions on the upper surface of the frame 12, and it is ensured that the actions of the two second motors 13 are synchronous;

[0023] As Figure 1 、 Figure 2 shown, on the left and right sides of each threaded rod 14 inside the frame 12, guide rails 15 are respectively vertically and symmetrically arranged at intervals. The upper and lower ends of each guide rail 15 are respectively fixedly connected to the corresponding positions on the inner top surface and the inner bottom surface of the frame 12; on each threaded rod 14, sliders 16 are respectively sleeved at intervals along its length. The four sliders 16 are all horizontally arranged inside the frame 12, and each adjacent two sliders 16 up and down are respectively screwed to the corresponding threaded rod 14 and are respectively vertically and slidably connected to the corresponding two guide rails 15; the right side surfaces of the four sliders 16 all vertically extend out of the right side surface of the frame 12 and are respectively fixedly connected to the four right-angle positions on the left side surface of the vertically and longitudinally arranged connecting plate 17. Thus, under the drive of the second motor 13, the connecting plate 17 moves vertically up and down with the slider 16.

[0024] As Figure 1 , Figure 2 shown, the electric push rod 18 is horizontally arranged in the area surrounded by the four sliders 16, and its fixed end is screwed and fixed at the middle position of the left side surface of the corresponding connecting plate 17. The pushing end of the electric push rod 18 horizontally extends to the right out of the connecting plate 17 and is screwed and fixed with the left end of the first bracket 22 through a flange plate, thereby driving the first bracket 22 to perform horizontal reciprocating motion.

[0025] On the left outer side surface of the frame 12 of the present utility model, a waist-shaped groove is vertically and perpendicularly embedded and opened relative to the position of the electric push rod 18. As Figure 1 , Figure 2 shown, the waist-shaped groove matches the tail of the electric push rod 18 and penetrates through the left inner side surface of the frame 12, thereby ensuring that the frame 12 does not interfere with the vertical up and down movement of the electric push rod 18 along with the connecting plate 17 through the waist-shaped groove; a reinforcing rod 19 is obliquely arranged between the tail of the electric push rod 18 and the corresponding slider 16. Both ends of each reinforcing rod 19 are fixedly connected with the electric push rod 18 and the corresponding slider 16 respectively, and do not interfere with the vertical up and down movement of the electric push rod 18 and the slider 16 respectively, and fix and strengthen the electric push rod 18 respectively; wherein, the height between the hinge point of the second bracket 23 and the fixed column 20 needs to ensure that neither the second bracket 23 nor the fixed column 20 interferes with the vertical up and down rotation of the spray gun boom 21; the middle position part of the two threaded rods 14 and the hinge point of the second bracket 23 are in the same horizontal plane, and the vertical up and down stroke of the connecting plate 17 and the pushing end stroke of the electric push rod 18 need to ensure that the spray gun boom 21 rotates vertically within a range of 120° up and down.

[0026] The base 1 of the present utility model is a horizontally arranged hollow cuboid structure, and hydraulic cylinders 3 are vertically and symmetrically arranged at the four right angles of its inner bottom surface. As Figure 1 , Figure 2 shown, the actions of the four hydraulic cylinders 3 are synchronous, and the piston rods of each hydraulic cylinder 3 vertically extend out of the lower surface of the base 1 respectively and are respectively connected with the corresponding universal wheels 4; legs 5 are vertically and symmetrically arranged at the four right angles of the lower surface of the base 1, and each leg 5 is arranged in the square area surrounded by the four universal wheels 4; wherein, the lower end surface of each universal wheel 4 is located above the horizontal plane where the lower end of the corresponding leg 5 is located when in the upper limit position. Driven by the hydraulic cylinders 3, the present utility model switches between the moving state and the welding state through the cooperation of the universal wheels 4 and the legs 5.

[0027] The rotating assembly of the present utility model is arranged without interference with the four hydraulic cylinders 3, and the rotating assembly includes a fixing plate 6, a gear shaft 7, a main bevel gear 8, a driven bevel gear 9 and a first motor 10; As Figure 1 ,Figure 2 As shown in the figure, a gear shaft 7 is vertically provided at the middle position inside the base 1. The lower end of the gear shaft 7 is rotatably connected to the inner bottom surface of the base 1, and its upper end vertically extends upward out of the upper surface of the base 1 and is coaxially and fixedly connected to the middle position of the lower surface of the bottom plate 2. A secondary bevel gear 9 is horizontally and coaxially sleeved and fixed on the gear shaft 7 relative to the inside of the base 1, and the secondary bevel gear 9 is arranged without interference with the base 1. A fixing plate 6 matching with it is vertically and longitudinally provided on one side of the secondary bevel gear 9 inside the base 1, and a first motor 10 is horizontally and transversely provided between the secondary bevel gear 9 and the fixing plate 6 inside the base 1. The fixed end of the first motor 10 is screwed and fixed to the corresponding side surface of the fixing plate 6, and its output end is horizontally arranged towards the secondary bevel gear 9 and is meshed and connected with the secondary bevel gear 9 through a main bevel gear 8. Driven by the first motor 10, through the meshing cooperation of the main bevel gear 8 and the secondary bevel gear disc, the gear shaft 7 rotates around its own axis and drives the bottom plate 2 to rotate horizontally.

[0028] As Figure 1 、 Figure 2 shown in the figure, a plurality of roller groups 24 abutting against the lower surface of the bottom plate 2 are also connected and provided on the upper surface of the base 1. The plurality of roller groups 24 are coaxially arranged with the bottom plate 2 and are respectively arranged without interference with the gear shaft 7. Each roller group 24 is conical, and its end close to the gear shaft 7 is the small end and the other end is the large end to adapt to the smaller linear velocity closer to the gear shaft 7 when the bottom plate 2 rotates.

[0029] The working principle of the present utility model: First, with the assistance of manpower, the base 1 is moved to the required welding position through the universal wheels 4; then the piston rod of the hydraulic cylinder 3 retracts, driving the universal wheels 4 to lift, so that the legs 5 are in contact with the ground to ensure the stability of the welding state; then, driven by the rotating assembly, the bottom plate 2 rotates horizontally to the required position; then, driven by the second motor 13, the connecting plate 17 moves vertically up and down with the slider 16, and through the cooperation of the electric push rod 18, the spray gun boom 21 rotates vertically around the second bracket 23, so as to position the spray gun boom 21. At this time, welding operation can be carried out through the spray gun installed at the right end of the spray gun boom 21.

[0030] The beneficial effects of the present utility model:

[0031] (1) Through the combined use of the lifting assembly, the electric push rod 18, the first bracket 22 and the second bracket 23, the present utility model improves the stability and positioning accuracy of the spray gun boom 21 during positioning;

[0032] (2) By setting the rotating assembly, the present utility model can rotate the spray gun boom 21 360° in all directions, improving its flexibility and wide application range;

[0033] (3) The utility model facilitates the switching between the moving state and the welding state through the combined use of the hydraulic cylinder 3, the universal wheels 4 and the legs 5, ensuring the stability during welding.

[0034] The above-described embodiments are only described as the preferred embodiments of the present utility model, and do not limit the concept and scope of the present utility model. Without departing from the design concept of the present utility model, various modifications and improvements made by ordinary engineering and technical personnel in the field to the technical solution of the present utility model should fall within the protection scope of the present utility model. The technical content for which the present utility model requests protection has been fully recorded in the claims.

Claims

1. An arm structure for an automated welding machine, characterized in that: The invention comprises a base, a bottom plate, a rotating assembly, a lifting assembly, an electric push rod, a fixed column, a first bracket, a second bracket and a spray gun arm; the bottom plate is a horizontally arranged square structure, and is arranged in parallel and spaced relation on the upper surface of the horizontally arranged base, and is connected to the base for horizontal rotation through a rotating assembly; a lifting assembly is vertically arranged at the left edge of the upper surface of the bottom plate, and an electric push rod is horizontally arranged at the lifting end of the lifting assembly, the pushing end of the electric push rod is arranged to the right, and is screwed to the left end of the horizontally arranged first bracket through a flange plate, thereby driving the first bracket to move vertically up and down and horizontally; a fixed column is vertically arranged at the right edge of the upper surface of the bottom plate, and a second bracket is vertically arranged on the upper surface of the fixed column; the left end of the spray gun arm is vertically hinged to the right end of the first bracket, and the middle part thereof is vertically hinged to the upper end of the second bracket, and the right end thereof horizontally extends to the right out of the vertical plane where the right side surface of the fixed column is located, and then, driven by the electric push rod and the lifting assembly, the spray gun arm is positioned through the cooperation of the first bracket and the second bracket.

2. The boom structure for an automated welding machine according to claim 1, characterized in that: The lifting assembly includes a fixed seat, a frame, a second motor, a threaded rod, a guide rail, a slider and a connecting plate; a fixed seat is horizontally arranged at the left edge of the upper surface of the bottom plate, and a hollow rectangular frame with an open right side is vertically fixed on the upper surface of the fixed seat; two threaded rods are vertically symmetrically arranged at front and rear intervals in the middle position inside the frame, and the lower end of each threaded rod is respectively connected to the inner bottom surface of the frame for rotation around its own axial direction, and the upper ends thereof are respectively extended vertically upward out of the upper surface of the frame, and are respectively linked to the output ends of the corresponding second motors; the two second motors are vertically symmetrically arranged at front and rear intervals, and their fixed ends are respectively screwed and fixed to the corresponding positions of the upper surface of the frame, and ensure the movement of the two second motors for synchronization; inside the frame, guide rails are vertically spaced and parallelly symmetrically arranged on the left and right sides of each threaded rod, and the upper and lower ends of each guide rail are fixedly connected to the corresponding positions of the inner top surface and the inner bottom surface of the frame; on each threaded rod, sliders are sleeved at upper and lower intervals along its length direction, four sliders are horizontally arranged in the frame, and every upper and lower adjacent two sliders are respectively screwed with the corresponding threaded rods, and are respectively connected to the corresponding two guide rails for vertical upward and downward sliding; the right sides of the four sliders extend vertically out of the right side of the frame, and are respectively fixedly connected to the four right angles of the left side of the connecting plate arranged vertically and longitudinally, and then under the drive of the second motor, the connecting plate moves vertically up and down with the slider.

3. The boom structure for an automated welding machine according to claim 2, characterized in that: The electric push rod is horizontally and laterally arranged in the area surrounded by the four sliding blocks, and its fixed end is screwed and fixed to the middle position of the left side surface of the corresponding connecting plate. The pushing end of the electric push rod extends horizontally and laterally to the right out of the connecting plate, and is screwed and fixed to the left end of the first bracket through the flange plate, thereby driving the first bracket to perform horizontal and transverse reciprocating motion.

4. The boom structure for an automated welding machine according to claim 3, characterized in that: A waist-shaped groove is vertically embedded in the left outer side surface of the frame relative to the position of the electric push rod in the vertical direction. The waist-shaped groove matches the tail of the electric push rod and passes through the left inner side surface of the frame, thereby ensuring that the frame does not interfere with the vertical up and down movement of the electric push rod with the connecting plate through the waist-shaped groove; a reinforcement rod is also obliquely provided between the tail of the electric push rod and the corresponding slider, and the two ends of each reinforcement rod are respectively fixedly connected to the electric push rod and the corresponding slider, and do not interfere with the vertical up and down movement of the electric push rod and the slider, and respectively fix and reinforce the electric push rod.

5. The boom structure for an automated welding machine according to claim 4, characterized in that: The height between the hinge point of the second bracket and the fixed column must ensure that the second bracket and the fixed column do not interfere with the vertical rotation of the spray gun arm; the middle position part of the two threaded rods and the hinge point of the second bracket are in the same horizontal plane, and the vertical stroke of the connecting plate and the pushing end stroke of the electric push rod must ensure that the spray gun arm can rotate vertically within a range of 120° up and down.

6. The boom structure for an automated welding machine according to claim 1, characterized in that: It also includes a hydraulic cylinder, a universal wheel and a support leg; the base is a horizontally arranged hollow rectangular structure, and hydraulic cylinders are vertically symmetrically arranged at the four right angles of its inner bottom surface, the four hydraulic cylinders move synchronously, and the piston rod of each hydraulic cylinder extends vertically downward out of the lower surface of the base, and is respectively connected to the corresponding universal wheel; support legs are vertically symmetrically arranged at the four right angles of the lower surface of the base, and each of the support legs is arranged in a square area surrounded by the four universal wheels; when in the upper limit position, the lower end surface of each universal wheel is arranged above the horizontal plane where the lower end of the corresponding support leg is located, and under the drive of the hydraulic cylinder, the mobile state and the welding state are switched through the cooperation of the universal wheel and the support leg.

7. The boom structure for an automated welding machine according to claim 6, characterized in that: The rotating assembly is arranged without interfering with the four hydraulic cylinders, and the rotating assembly includes a fixed plate, a gear shaft, a main bevel gear, a slave bevel gear and a first motor; a gear shaft is also vertically arranged in the middle position of the inner part of the base, the lower end of the gear shaft is rotatably connected with the inner bottom surface of the base, and its upper end vertically extends upward from the upper surface of the base, and is coaxially fixedly connected with the middle position of the lower surface of the base plate; a slave bevel gear is also horizontally and coaxially sleeved and fixedly arranged on the gear shaft relative to the inside of the base, and the slave bevel gear and the base are arranged without interfering with each other; a fixing plate matching it is also vertically and longitudinally arranged in the inside of the base relative to one side of the slave bevel gear, and a first motor is also horizontally and transversely arranged in the inside of the base relative to the slave bevel gear and the fixing plate, the fixing end of the first motor is screwed and fixed to the corresponding side of the fixing plate, and its output end is horizontally arranged in the direction of the slave bevel gear, and is meshed and connected with the slave bevel gear through the main bevel gear, and then under the drive of the first motor, through the meshing cooperation of the main bevel gear and the slave bevel gear disc, the gear shaft rotates around its own axis and drives the base plate to rotate horizontally.

8. The boom structure for an automated welding machine according to claim 7, characterized in that: It also includes a roller group; a plurality of circles of roller groups abutting against the lower surface of the bottom plate are connected to the upper surface of the base, and the plurality of circles of roller groups are coaxially arranged with the bottom plate, and are respectively arranged without interfering with the gear shaft; each of the roller groups is conical, and one end close to the gear shaft is a small end, and the other end is a large end, so as to adapt to the smaller linear velocity close to the gear shaft when the bottom plate rotates.

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