Electric arc welding device for steel gate limited space

Abstract

The invention relates to the technical field of steel gate machining, in particular to an electric arc welding device for a steel gate limited space, which comprises a base and an electric arc welding gun, the lower end of the base is movably provided with a transverse sliding seat through a transverse moving mechanism, and the upper end of the transverse sliding seat is fixedly connected with a portal frame penetrating through the base. According to the steel gate automatic welding device, the whole steel gate automatic welding device is mainly composed of the base, the transverse moving base, the longitudinal sliding table, the lifting rack, the four electric arc welding guns, the adjusting mechanism and the electric control part, automatic welding operation of the steel gate limited space can be achieved, and compared with original manual welding operation, the efficiency is improved by two times to four times; and meanwhile, an operator only needs to stand in front of the numerical control terminal for operation in the whole welding process, the safety problems of head congestion and dizziness, limb imbalance falling, welding smoke inhalation, welding smoke fumigation and the like during actual welding operation of the operator are avoided, and therefore the efficiency, safety and stability of welding operation of the steel gate in the limited space are improved.

Description

Technical Field

[0001] The invention relates to the technical field of steel gate processing, and in particular to an arc welding device used in a confined space of a steel gate. Background Art

[0002] In order to improve the bending resistance, impact resistance and structural bearing stability of the steel gate after processing, it is necessary to weld a reinforced steel plate group for structural reinforcement on the back surface of the steel gate during the processing of the steel gate. The currently used reinforced steel plate groups are as follows: Figure 1 As shown in the figure, it is composed of a plurality of horizontally and vertically distributed steel bars combined and plugged together, and then the joints of the reinforcing steel plate group and the connection between the reinforcing steel plate group and the gate plate are welded and fixed together by arc welding, so that the reinforcing steel plate and the gate plate can form a stable load-bearing whole.

[0003] At present, since the joints of the reinforced steel plate group and the connection between the reinforced steel plate group and the gate plate are all right-angle narrow gaps with an angle of 90°, the use of large-scale automated arc welding equipment has defects such as limited space, interference in welding gun movement and poor welding effect. Therefore, manual welding was mainly used before. Although manual operation can ensure the quality of right-angle narrow gap welding, the work efficiency is low. At the same time, manual operation requires the operator to keep a bent posture for a long time with the head looking down at the narrow gap. During actual welding operations, the operator is prone to safety problems such as head congestion and dizziness, unbalanced limbs and falls, welding smoke inhalation and welding smoke eye smoke, resulting in the safety and stability of the entire welding process cannot meet the actual safety production and processing needs.

[0004] In view of this, it is particularly important to design and manufacture a small and medium-sized arc welding device that can reduce the actual welding workload of operators and improve the welding efficiency, safety and stability of confined spaces of steel gates. Summary of the invention

[0005] The purpose of the present invention is to propose an arc welding device for the confined space of a steel gate in order to solve the problems of low welding efficiency, easy damage to the operator's body during the entire welding process, and poor safety and stability of the welding operation during traditional welding operations on the confined space of a steel gate.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: An arc welding device for a confined space of a steel gate comprises a base and an arc welding gun, wherein a transverse sliding seat is movably mounted on the lower end of the base via a transverse movement mechanism, a gantry penetrating the base is fixedly connected to the upper end of the transverse sliding seat, a longitudinal sliding table is movably mounted on the upper end of the gantry via a longitudinal movement mechanism, a material unloading rack is mounted on the left side of the upper end of the longitudinal sliding table, a welding wire reel is detachably mounted on the material unloading rack, a lifting frame is movably mounted on the middle part of the longitudinal sliding table via a lifting mechanism, four arc welding guns distributed in a square and with welding heads facing the central axis of the lifting frame are arranged below the lifting frame, feeders are mounted on the upper ends of the four arc welding guns, and an adjustment mechanism for synchronously adjusting the spacing between the four arc welding guns is arranged between the lower end of the lifting frame and the four arc welding guns.

[0007] As a further description of the above technical solution: The adjustment mechanism includes a vertical rod installed in the middle of the lower end of the lifting frame, a lower cross slide fixed to the lower end of the vertical rod and covering four arc welding guns, a long hole opened on the four brackets of the lower cross slide and located on the outside of the arc welding gun, an external gear disk rotatably installed on the outside of the vertical rod and located above the lower cross slide, an arc hole opened at 90° on the external gear disk and located on the outside of the arc welding gun, a driving motor installed at the front end of the vertical rod, a transmission gear installed at the lower end of the driving motor and meshing with the external gear disk, and an anti-deflection part arranged between the vertical rod and the upper ends of the four arc welding guns.

[0008] As a further description of the above technical solution: The anti-deflection part includes an upper cross slide installed on the upper end of the vertical rod, an anti-deflection sliding block installed on the upper ends of four arc welding guns and penetrating upward through the four brackets of the upper cross slide, and an anti-deflection sliding groove opened on the four brackets of the upper cross slide and used to accommodate the anti-deflection sliding block.

[0009] As a further description of the above technical solution: Two limit retaining rings are installed on the four arc welding guns, and the two limit retaining rings are respectively abutted against the lower end surface of the lower cross slide and the upper end surface of the outer gear disc.

[0010] As a further description of the above technical solution: The lifting frame is a hollow structure, and wire feeding holes facing the upper end of the arc welding gun are provided at four corners of the lower end of the lifting frame.

[0011] As a further description of the above technical solution: The transverse movement mechanism includes two guide columns installed in parallel at the lower end of the base and vertically passing through the transverse sliding seat, a guide sleeve fixed at the front and rear ends of the transverse sliding seat and adapted to the two guide columns, an X-axis servo motor installed in the middle of the right end of the base, an external screw installed at the left end of the X-axis servo motor and passing through the middle of the transverse sliding seat, and an internal screw sleeve fixed in the middle of the transverse sliding seat and adapted to the external screw.

[0012] As a further description of the above technical solution: The longitudinal movement mechanism includes a Y-axis servo motor installed in the middle of the front end of the longitudinal slide, a travel gear installed at the lower end of the Y-axis servo motor, and a longitudinal movement rack installed on the inner side of the horizontal end of the gantry and meshing with the travel gear.

[0013] As a further description of the above technical solution: The lifting mechanism includes a Z-axis servo motor installed on the rear side of the upper end of the longitudinal slide, a lifting gear installed on the left end of the Z-axis servo motor and located on the rear side of the lifting frame, and a lifting rack fixed at the rear end of the lifting frame and meshing with the lifting gear.

[0014] As a further description of the above technical solution: A negative pressure filter box is installed in the middle of the right side of the upper end of the longitudinal sliding table, and an air suction pipe penetrating the longitudinal sliding table is installed at the lower end of the negative pressure filter box. A telescopic inner tube facing the arc welding gun is movably installed at the lower end of the air suction pipe, and an air suction pump connected to the upper end of the negative pressure filter box is installed at the left end of the negative pressure filter box. A box cover is installed at the right end of the negative pressure filter box by screwing, and activated carbon filter cotton is detachably installed between the box cover and the middle of the negative pressure filter box.

[0015] As a further description of the above technical solution: A numerical control terminal is installed on the left side of the front end of the base, an upper distance sensor with a collection end vertically distributed downward is installed between the front end and the right corner of the longitudinal slide, a camera with a collection end vertically distributed downward is installed in the middle of the lower end of the lower cross slide, and a lower distance sensor with a collection end vertically distributed downward is installed at the lower end of the lower cross slide, which is located in front of the camera, and the output ends of the upper distance sensor, the camera and the lower distance sensor are electrically connected to the input end of the numerical control terminal respectively, and the output end of the numerical control terminal is electrically connected to the input ends of the arc welding gun, the feeder, the Y-axis servo motor, the Z-axis servo motor, the vacuum pump, the drive motor and the X-axis servo motor respectively.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In the present invention, the whole is mainly composed of a base, a transverse seat, a longitudinal slide, a lifting frame, four arc welding guns, an adjustment mechanism and an electric control part. The transverse mechanism between the base and the transverse seat can drive the four arc welding guns to move along the X-axis direction, the longitudinal mechanism between the main slide and the gantry can drive the four arc welding guns to move along the Y-axis direction, and the lifting mechanism between the main slide and the lifting frame can drive the four arc welding guns to move along the Z-axis direction, so as to realize the three-axis movement and position adjustment operation of the four arc welding guns. When the adjustment mechanism is working, the spacing between the four arc welding guns can be adjusted to meet the use requirements of narrow seam welding of reinforced steel plates of different thicknesses. In addition, the upper The distance sensor, the lower distance sensor and the camera can collect the vertical travel distance data of the four arc welding guns and the image data of the arc welding guns in real time to ensure the automatic and stable operation of the entire welding process. This structure can realize the automated welding operation of the confined space of the steel gate, which is two to four times more efficient than the original manual welding operation. At the same time, the entire welding process only requires the operator to stand in front of the CNC terminal to operate, avoiding the occurrence of safety problems such as head congestion and dizziness, unbalanced limbs and falls, welding smoke inhalation and welding smoke eye smoke during actual welding operations, thereby improving the efficiency, safety and stability of welding operations in confined spaces of steel gates.

[0017] 2. In the present invention, a negative pressure filter box, an air suction pipe, a telescopic inner tube, an exhaust pump, a box cover and activated carbon filter cotton are arranged on the longitudinal sliding table. When the exhaust pump is working, a negative pressure state will be generated inside the negative pressure filter box, and the air above the working area of ​​the arc welding gun can be continuously sucked into the negative pressure filter box through the telescopic inner tube and the exhaust pipe. The activated carbon filter cotton between the negative pressure filter box and the box cover can simultaneously filter and purify the welding smoke. This can guide the filtration and purification of the exhaust gas generated during the welding operation of the arc welding gun, reduce the occurrence of dust-containing exhaust gas polluting the environment and the problem of inhalation by operators, thereby improving the safety and environmental protection of the arc welding equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a working schematic diagram of the arc welding device for the confined space of a steel gate proposed by the present invention; Figure 2 It is a front bottom view schematic diagram of the present invention; Figure 3 It is a schematic diagram of the structure of the gantry and the longitudinal slide platform in the present invention; Figure 4 It is a three-dimensional rear view schematic diagram of the longitudinal sliding platform in the present invention; Figure 5 It is a three-dimensional disassembly schematic diagram of the lifting frame and the arc welding gun in the present invention.

[0019] Legend: 1. Base; 101. Guide column; 2. Horizontal slide seat; 201. Gantry; 202. Longitudinal rack; 203. Inner screw sleeve; 204. Guide sleeve; 3. Longitudinal slide table; 301. Unloading rack; 302. Wire reel; 4. Lifting rack; 401. Lifting rack; 402. Wire feeding hole; 5. Vertical rod; 501. Lower cross slide; 502. Long hole; 6. Arc welding gun; 601. Feeder; 602. Anti-bias slider; 603. Limiting ring; 7. External toothed disc; 701. Arc hole; 8. Upper cross slide ;801, anti-bias slide; 9, Y-axis servo motor; 901, walking gear; 10, Z-axis servo motor; 1001, lifting gear; 11, negative pressure filter box; 1101, suction pipe; 1102, telescopic inner tube; 1103, vacuum pump; 1104, box cover; 1105, activated carbon filter cotton; 12, upper distance sensor; 13, camera; 14, lower distance sensor; 15, drive motor; 1501, transmission gear; 16, CNC terminal; 17, X-axis servo motor; 1701, external screw. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-5 The present invention provides a technical solution: an arc welding device for a confined space of a steel gate, comprising a base 1 and an arc welding gun 6, a transverse sliding seat 2 being movably mounted on the lower end of the base 1 through a transverse movement mechanism, a gantry 201 penetrating the base 1 being fixedly connected to the upper end of the transverse sliding seat 2, a longitudinal sliding platform 3 being movably mounted on the upper end of the gantry 201 through a longitudinal movement mechanism, a material discharge rack 301 being mounted on the left side of the upper end of the longitudinal sliding platform 3, a welding wire reel 302 being detachably mounted on the material discharge rack 301, a lifting frame 4 being movably mounted on the middle part of the longitudinal sliding platform 3 through a lifting mechanism, four arc welding guns 6 distributed in a square shape and with welding heads facing the central axis of the lifting frame 4 are arranged below the lifting frame 4, feeders 601 are installed on the upper ends of the four arc welding guns 6, and an adjustment mechanism for synchronously adjusting the spacing between the four arc welding guns 6 is arranged between the lower end of the lifting frame 4 and the four arc welding guns 6.

[0022] Specifically, Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the adjustment mechanism includes a vertical rod 5 installed at the middle of the lower end of the lifting frame 4, a lower cross slide 501 fixed to the lower end of the vertical rod 5 and covering four arc welding guns 6, a long hole 502 opened on four brackets of the lower cross slide 501 and located on the outside of the arc welding gun 6, an outer gear plate 7 rotatably installed on the outside of the vertical rod 5 and located above the lower cross slide 501, an arc hole 701 opened on the outer gear plate 7 at 90 degrees and located on the outside of the arc welding gun 6, and a driving A driving motor 15, a transmission gear 1501 installed at the lower end of the driving motor 15 and meshing with the outer gear disk 7, and an anti-deflection portion arranged between the vertical rod 5 and the upper ends of four arc welding guns 6, wherein the arc welding guns 6 can slide alternately in the long strip holes 502 of the lower cross slide 501 and the arc holes 701 on the outer gear disk 7, thereby realizing the synchronous inward contraction adjustment or outward expansion adjustment of the four arc welding guns 6, so as to be suitable for welding operations between reinforced steel plate groups and gate plates of different thicknesses.

[0023] Among them, the anti-deflection part includes an upper cross slide 8 installed on the upper end of the vertical rod 5, an anti-deflection slider 602 installed on the upper ends of the four arc welding guns 6 and upwardly penetrating the four brackets of the upper cross slide 8, and an anti-deflection slide groove 801 opened on the four brackets of the upper cross slide 8 and used to accommodate the anti-deflection slider 602. The setting of the anti-deflection slider 602 and the anti-deflection slide groove 801 can enable the welding heads of the four arc welding guns 6 to always remain facing the central axis of the lifting frame 4, so that the welding heads of the arc welding guns 6 can stably maintain centered contact with the narrow gap.

[0024] At the same time, two limit rings 603 are installed on each of the four arc welding guns 6, and the two limit rings 603 are respectively abutted against the lower end surface of the lower cross slide 501 and the upper end surface of the outer gear disk 7. The setting of the limit rings 603 can limit the displacement and deflection of the arc welding gun 6 in the Z-axis direction between the lower cross slide 501 and the outer gear disk 7, thereby improving the stability of the arc welding gun 6 in the staggered sliding adjustment between the long hole 502 of the lower cross slide 501 and the arc hole 701 of the outer gear disk 7.

[0025] In addition, the lifting frame 4 is a hollow structure, and the four corners of the lower end of the lifting frame 4 are provided with wire feeding holes 402 facing the upper end of the arc welding gun 6, so that the welding wire on the wire reel 302 can pass through the lifting frame 4 downward to the feeder 601 of the arc welding gun 6, thereby stably supplying the welding wire from the wire reel 302 downward to the arc welding gun 6.

[0026] Specifically, Figure 2As shown, the transverse movement mechanism includes two guide columns 101 installed in parallel at the lower end of the base 1 and vertically passing through the transverse sliding seat 2, a guide sleeve 204 fixed at the front and rear ends of the transverse sliding seat 2 and adapted to the two guide columns 101, an X-axis servo motor 17 installed in the middle of the right end of the base 1, an outer screw 1701 installed at the left end of the X-axis servo motor 17 and passing through the middle of the transverse sliding seat 2, and an inner screw sleeve 203 fixed in the middle of the transverse sliding seat 2 and adapted to the outer screw 1701. When the X-axis servo motor 17 is working, it can drive the outer screw 1701 to rotate forward or reverse. Under the spiral transmission action between the outer screw 1701 and the inner screw sleeve 203, the transverse sliding seat 2 as a whole can stably move along the X-axis direction between the lower end of the base 1 and the two guide columns 101, thereby realizing the displacement adjustment operation of the four arc welding guns 6 in the X-axis direction.

[0027] Specifically, Figure 1 and Figure 3 As shown, the longitudinal movement mechanism includes a Y-axis servo motor 9 installed in the middle of the front side of the upper end of the longitudinal slide 3, a traveling gear 901 installed at the lower end of the Y-axis servo motor 9, and a longitudinal movement rack 202 installed on the inner side of the horizontal end of the gantry 201 and meshing with the traveling gear 901. When the Y-axis servo motor 9 is working, it can drive the traveling gear 901 to rotate. Under the meshing transmission action between the traveling gear 901 and the longitudinal movement rack 202, the longitudinal slide 3 as a whole can move along the Y-axis direction on the gantry 201, thereby realizing the displacement adjustment operation of the four arc welding guns 6 in the Y-axis direction.

[0028] Specifically, Figure 1 , Figure 3 and Figure 4 As shown, the lifting mechanism includes a Z-axis servo motor 10 installed on the rear side of the upper end of the longitudinal slide 3, a lifting gear 1001 installed on the left end of the Z-axis servo motor 10 and located on the rear side of the lifting frame 4, and a lifting rack 401 fixed to the rear end of the lifting frame 4 and meshing with the lifting gear 1001. When the Z-axis servo motor 10 is working, it can drive the lifting gear 1001 to rotate. Under the meshing transmission action between the lifting gear 1001 and the lifting rack 401, the lifting frame 4 as a whole can move along the Z-axis direction on the longitudinal slide 3, thereby realizing the displacement adjustment operation of the four arc welding guns 6 in the Z-axis direction.

[0029] Specifically, Figure 1 , Figure 3 and Figure 4As shown, a negative pressure filter box 11 is installed in the middle of the right side of the upper end of the vertical slide 3, and an air intake pipe 1101 penetrating the vertical slide 3 is installed at the lower end of the negative pressure filter box 11. A telescopic inner tube 1102 facing the arc welding gun 6 is movably installed at the lower end of the air intake pipe 1101. The telescopic inner tube 1102 can be vertically slid and adjusted under the air intake pipe 1101 according to the actual working conditions to adjust the height of the negative pressure suction of welding smoke. The left end of the negative pressure filter box 11 is connected to the upper end of the negative pressure filter box 11. A vacuum pump 1103 and a box cover 1104 are installed on the right end of the negative pressure filter box 11 through a threaded connection. An activated carbon filter cotton 1105 is detachably installed between the box cover 1104 and the middle part of the negative pressure filter box 11. After the box cover 1104 is unscrewed from the right end of the negative pressure filter box 11, the filtered solid impurities and the contaminated activated carbon filter cotton 1105 can be taken out from the negative pressure filter box 11, thereby realizing the discharge of solid impurities and the cleaning or replacement of the activated carbon filter cotton 1105.

[0030] Specifically, Figure 1-Figure 5 As shown, a numerical control terminal 16 is installed on the left side of the front end of the base 1, an upper distance sensor 12 with a collection end vertically distributed downward is installed between the front end and the right end corner of the longitudinal slide 3, a camera 13 with a collection end vertically distributed downward is installed in the middle of the lower end of the lower cross slide 501, and a lower distance sensor 14 with a collection end vertically distributed downward is installed at the lower end of the lower cross slide 501 in front of the camera 13, and the output ends of the upper distance sensor 12, the camera 13 and the lower distance sensor 14 are respectively electrically connected to the input end of the numerical control terminal 16, and the output ends of the numerical control terminal 16 are respectively connected to the arc welding gun 6, the feeder 601, and the Y The input ends of the Y-axis servo motor 9, the Z-axis servo motor 10, the vacuum pump 1103, the drive motor 15 and the X-axis servo motor 17 are electrically connected, and the CNC terminal 16 can receive the operator's working parameter settings and the distance data and image data of the upper distance sensor 12, the lower distance sensor 14 and the camera 13 in real time, and automatically or manually control the arc welding gun 6, the feeder 601, the Y-axis servo motor 9, the Z-axis servo motor 10, the vacuum pump 1103, the drive motor 15 and the X-axis servo motor 17 to perform corresponding work, so as to realize the automated welding operation of the steel gate or the active filtering and purification of the exhaust gas.

[0031] Working principle: During the preparation, the gate plate and the reinforcing steel plate group after preliminary assembly are placed in the center of the base 1. The operator can operate the CNC terminal 16 to control the drive motor 15 to move clockwise or counterclockwise according to the thickness of the reinforcing steel plate. Under the meshing transmission between the transmission gear 1501 and the outer gear plate 7, the outer gear plate 7 can rotate in the opposite direction on the vertical rod 5. Under the combined limiting action of the limiting retaining ring 603, the anti-bias slider 602 and the anti-bias slide groove 801, the four arc welding guns 6 can be moved downward. The four arc welding guns 6 are staggered and slide in the long holes 502 of the cross slide 501 and the arc holes 701 on the outer gear disk 7, thereby driving the four arc welding guns 6 to move toward the middle or spread outward. When the welding heads of the four arc welding guns 6 can all contact the joints of the reinforced steel plate groups, the wire reel 302 containing the welding wire can be placed on the unloading rack 301, and the four groups of welding wires are inserted downward into the feeder 601 of the arc welding gun 6 through the wire feeding holes 402 on the lifting rack 4, thereby completing the early debugging work of the four arc welding guns 6.

[0032] The operator can set the travel distance of the X-axis servo motor 17 through the CNC terminal 16 according to the spacing of the longitudinally distributed steel plates of the reinforcing steel plate group. The operator can set the travel distance of the Y-axis servo motor 9 through the CNC terminal 16 according to the spacing of the transversely distributed steel plates of the reinforcing steel plate group. Finally, the height data of the reinforcing steel plate group is input into the CNC terminal 16, and the welding travel paths of the four arc welding guns 6 can be set.

[0033] During actual welding operation, the operator can operate the CNC terminal 16 to adjust the four arc welding guns 6 to the corners of the gate plate and the reinforcing steel plate group as the starting point of the welding process. The welding walking path can be set to S-shaped walking or spiral inward walking; when performing welding operations between the outer periphery of the gate plate and the lateral side of the reinforcing steel plate group and the upper end face of the gate plate and the lower end face of the reinforcing steel plate group, the two arc welding guns 6 at the corresponding positions can be set to walk along the narrow gap. When performing welding operations at the joints of the reinforced steel plate group, the four arc welding guns 6 can be set to walk synchronously along the gap. The upper distance sensor 12 can collect the vertical height data between the lower end of the longitudinal slide 3 and the upper end of the gate plate in real time, and the lower distance sensor 14 can collect the vertical height data between the lower cross slide 501 and the reinforcing steel plate in real time. The vertical height data between the longitudinal plates of the reinforced steel plate group or the upper ends of the gate plates, and the camera 13 can collect the welding walking tracks and welding work graphic data between the four arc welding guns 6 and the reinforced steel plate group and the gate plates in real time. The above-collected working height data and working image data of the arc welding gun 6 can be transmitted to the CNC terminal 16 in real time. The CNC terminal 16 can display the welding work data on the display screen for the operator to understand the working status of the arc welding device. At the same time, the CNC terminal 16 can automatically control the arc welding gun 6, the feeder 601, the Y-axis servo motor 9, the Z-axis servo motor 10 and the X-axis servo motor 17 according to the program settings, so as to realize the automatic walking welding processing of the gate plate and the reinforced steel plate group.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An arc welding device for a confined space of a steel gate, comprising a base (1) and an arc welding gun (6), characterized in that: A transverse sliding seat (2) is movably mounted on the lower end of the base (1) via a transverse movement mechanism, a gantry (201) that penetrates the base (1) is fixedly connected to the upper end of the transverse sliding seat (2), a longitudinal sliding platform (3) is movably mounted on the upper end of the gantry (201) via a longitudinal movement mechanism, a material placing rack (301) is mounted on the left side of the upper end of the longitudinal sliding platform (3), a welding wire reel (302) is detachably mounted on the material placing rack (301), a lifting frame (4) is movably mounted on the middle part of the longitudinal sliding platform (3) via a lifting mechanism, four arc welding guns (6) distributed in a square shape and with welding heads facing the central axis of the lifting frame (4) are arranged below the lifting frame (4), feeders (601) are mounted on the upper ends of the four arc welding guns (6), and an adjustment mechanism for synchronously adjusting the spacing between the four arc welding guns (6) is arranged between the lower end of the lifting frame (4) and the four arc welding guns (6).

2. The arc welding device for confined space of steel gate according to claim 1, characterized in that: The adjustment mechanism comprises a vertical rod (5) mounted at the middle of the lower end of the lifting frame (4), a lower cross slide (501) fixed at the lower end of the vertical rod (5) and covering four arc welding guns (6), a long hole (502) opened on four brackets of the lower cross slide (501) and located outside the arc welding gun (6), an outer gear disk (7) rotatably mounted outside the vertical rod (5) and located above the lower cross slide (501), an arc hole (701) opened at 90 degrees on the outer gear disk (7) and located outside the arc welding gun (6), a driving motor (15) mounted at the front end of the vertical rod (5), a transmission gear (1501) mounted at the lower end of the driving motor (15) and meshing with the outer gear disk (7), and an anti-deflection portion arranged between the vertical rod (5) and the upper ends of the four arc welding guns (6).

3. The arc welding device for the confined space of a steel gate according to claim 2, characterized in that: The anti-deflection portion comprises an upper cross slide (8) mounted on the upper end of the vertical rod (5), an anti-deflection slide block (602) mounted on the upper ends of four arc welding guns (6) and penetrating upward through four brackets of the upper cross slide (8), and an anti-deflection slide groove (801) provided on the four brackets of the upper cross slide (8) and used to accommodate the anti-deflection slide block (602).

4. The arc welding device for the confined space of a steel gate according to claim 2, characterized in that: Two limit retaining rings (603) are installed on each of the four arc welding guns (6), and the two limit retaining rings (603) are respectively in contact with the lower end surface of the lower cross slide (501) and the upper end surface of the outer gear disc (7).

5. The arc welding device for confined space of steel gate according to claim 2, characterized in that: The lifting frame (4) is a hollow structure, and wire holes (402) facing the upper end of the arc welding gun (6) are provided at four corners of the lower end of the lifting frame (4).

6. The arc welding device for confined space of steel gate according to claim 1, characterized in that: The transverse movement mechanism comprises two guide columns (101) installed in parallel at the lower end of the base (1) and vertically passing through the transverse slide seat (2), a guide sleeve (204) fixed at the front and rear ends of the transverse slide seat (2) and adapted to the two guide columns (101), an X-axis servo motor (17) installed at the middle of the right end of the base (1), an external screw (1701) installed at the left end of the X-axis servo motor (17) and passing through the middle of the transverse slide seat (2), and an internal screw sleeve (203) fixed at the middle of the transverse slide seat (2) and adapted to the external screw (1701).

7. The arc welding device for confined space of steel gate according to claim 1, characterized in that: The longitudinal movement mechanism comprises a Y-axis servo motor (9) mounted on the middle of the front upper end of the longitudinal slide (3), a travel gear (901) mounted on the lower end of the Y-axis servo motor (9), and a longitudinal movement rack (202) mounted on the inner side of the horizontal end of the gantry (201) and meshing with the travel gear (901).

8. The arc welding device for confined space of steel gate according to claim 1, characterized in that: The lifting mechanism comprises a Z-axis servo motor (10) mounted on the rear side of the upper end of the longitudinal slide (3), a lifting gear (1001) mounted on the left end of the Z-axis servo motor (10) and located on the rear side of the lifting frame (4), and a lifting rack (401) fixed to the rear end of the lifting frame (4) and meshing with the lifting gear (1001).

9. The arc welding device for confined space of steel gate according to claim 1, characterized in that: A negative pressure filter box (11) is installed in the middle of the right side of the upper end of the longitudinal slide (3), and an air intake pipe (1101) penetrating the longitudinal slide (3) is installed at the lower end of the negative pressure filter box (11), and a telescopic inner tube (1102) facing the arc welding gun (6) is movably installed at the lower end of the air intake pipe (1101). An air pump (1103) connected to the upper end of the negative pressure filter box (11) is installed at the left end of the negative pressure filter box (11), and a box cover (1104) is installed at the right end of the negative pressure filter box (11) by screwing, and an activated carbon filter cotton (1105) is detachably installed between the box cover (1104) and the middle part of the negative pressure filter box (11).

10. The arc welding device for confined space of steel gate according to claim 2, characterized in that: A numerical control terminal (16) is installed on the left side of the front end of the base (1); an upper distance sensor (12) with a collection end vertically distributed downward is installed between the front end and the right end corner of the longitudinal slide (3); a camera (13) with a collection end vertically distributed downward is installed in the middle of the lower end of the lower cross slide (501); a lower distance sensor (14) with a collection end vertically distributed downward is installed at the lower end of the lower cross slide (501) and located in front of the camera (13); the output ends of the upper distance sensor (12), the camera (13) and the lower distance sensor (14) are respectively electrically connected to the input end of the numerical control terminal (16); and the output end of the numerical control terminal (16) is respectively electrically connected to the input ends of the arc welding gun (6), the feeder (601), the Y-axis servo motor (9), the Z-axis servo motor (10), the vacuum pump (1103), the drive motor (15) and the X-axis servo motor (17).

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