Steel structure welding equipment and welding method for constructional engineering

Abstract

The invention discloses steel structure welding equipment for constructional engineering and a welding method.The welding equipment comprises a rack, a working platform, a push-pull mechanism, a bearing support, a lifting mechanism, an infrared laser and a center positioning mechanism, a sleeve is connected to the working platform, a pipe clamping piece is connected to the sleeve, and the output end of the push-pull mechanism is connected with the working platform; the output end of the lifting mechanism is connected with a feeding hopper, and the center positioning mechanism is provided with a center mark corresponding to the infrared laser. The welding method comprises the following steps: (a) preparing a tubular column and a steel plate; (b) arranging a steel plate; (c) arranging a tubular column; (d) centering; (e) docking; (f) pouring; and (g) forming. The welding equipment is novel in structure, a welding mode of manually holding a welding gun is replaced, the labor intensity is low, and the welding quality is high; the welding method is simple in process, gradually ordered, low in operation difficulty, free of welding flux splashing, high in safety, easy to control and capable of guaranteeing the welding quality.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structure welding, and in particular relates to steel structure welding equipment and a welding method for construction engineering. Background Art

[0002] Steel structure is a structure made of steel materials and is one of the main types of building structures. Steel columns are commonly used supporting components in steel structures, which are generally welded from a steel plate and two cylinders. During the welding process, the two cylinders are arranged on both sides of the steel plate, and the cylinders and steel plates are supported by pads or support seats so that the two cylinders clamp the steel plate. Then the workers hold the welding gun to weld the joints between the steel plate and the cylinders. There are the following defects: alignment is difficult, and it is difficult to ensure that the two cylinders are arranged concentrically. The central axes of the two cylinders are staggered. In actual application, it is easy to cause uneven force on the two surfaces of the steel plate, causing the steel plate to bend and deform, which in turn affects the overall stability. In addition, manual welding requires high operation and high strength, and there are certain safety hazards. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned technical problems existing in the prior art, and to provide a steel structure welding equipment and a welding method for construction engineering. The welding equipment has a novel structure, replaces the welding method of manual hand-held welding gun, has low labor intensity and high welding quality; the welding method has a simple process, is step-by-step and orderly, has low operation difficulty, has no solder splashing phenomenon, has high safety, is easy to control, and can ensure welding quality.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A steel structure welding equipment for construction engineering, characterized by comprising:

[0006] frame;

[0007] A working platform is slidably connected to the frame, a sleeve is connected to the working platform, a pipe clamp is connected to the sleeve, and the pipe clamp is used to clamp the round pipe column;

[0008] A push-pull mechanism is arranged on the frame, the output end of which is connected to the working platform, and the push-pull mechanism drives the working platform to perform horizontal linear motion;

[0009] A load-bearing bracket is arranged on the frame, and a positioning column is arranged on the load-bearing bracket, and the positioning column corresponds to the positioning concave hole of the steel plate;

[0010] A lifting mechanism is arranged on the frame, the output end of the lifting mechanism is connected to a filling hopper, the lifting mechanism drives the filling hopper to do lifting movement, a filling nozzle is arranged at the bottom of the filling hopper, and the filling nozzle is located above the bearing bracket;

[0011] An infrared laser slidably attached to the frame;

[0012] The central positioning mechanism is used for being installed in a circular tube column, and a central mark corresponding to the infrared laser is arranged on the central positioning mechanism.

[0013] Furthermore, the center positioning mechanism includes an inner plate, a spring, a telescopic tube and an outer foot, the spring and the telescopic tube are arranged between the inner plate and the outer foot, the spring is located in the telescopic tube, and the center mark is arranged at the center of the inner plate. The expansion range of the center positioning mechanism is flexible and adjustable, and can be adapted to round tubes of different diameters, and has strong adaptability.

[0014] Furthermore, the pipe clamp includes a handle screw and a clamping plate, the handle screw is rotatably connected to the clamping plate, the clamping plate is located in a sleeve, and the sleeve is threadedly connected to the handle screw. Rotating the handle screw can drive the clamping plate to rise and fall, change the distance between the upper and lower clamping plates, and can adapt to round pipes of different diameters, with strong adaptability.

[0015] Furthermore, the injection hopper is provided with an outer edge portion, and a pressure rod is provided at the bottom of the outer edge portion. The pressure rod is used to press the steel plate onto the bearing bracket to effectively fix the steel plate and prevent the steel plate from loosening freely and affecting the accurate docking of the steel plate and the circular pipe column.

[0016] Furthermore, a servo motor and a pipe support are provided on the working platform, the sleeve passes through and rotates to connect the pipe support, the servo motor is connected to a transmission gear, a gear ring is provided on the sleeve, and the gear ring is meshed and connected with the transmission gear.

[0017] Furthermore, a slideway is provided on the frame, a fixed bracket is slidably connected in the slideway, the infrared laser is fixed on the fixed bracket, the slideway includes a first slideway and a second slideway, the first slideway is connected to the second slideway, the horizontal center line of the second slideway and the center axis of the sleeve are located in the same plane; when the infrared laser is working, the fixed bracket is located in the second slideway; when the infrared laser is idle, the fixed bracket is located in the first slideway. The position of the fixed bracket is flexible and adjustable, will not affect the installation of the round tube column, and the operation is also simple.

[0018] A welding method for steel structure for construction engineering, characterized by comprising the following steps:

[0019] (a) Prepare a circular tube column and a steel plate: The top and bottom surfaces of the steel plate are both provided with stepped grooves, the stepped grooves include a first groove and a second groove, the first groove is connected to the second groove, the cross-sectional diameter of the first groove is smaller than the cross-sectional diameter of the second groove, the first groove corresponds to the circular tube column, a material injection hole is provided on one side of the steel plate, a material guide channel is provided between the material injection hole and the second groove, and a positioning recessed hole is provided on the other side of the steel plate;

[0020] (b) Installation of steel plates:

[0021] ① Put the positioning concave hole of the steel plate onto the positioning column on the load-bearing bracket to position the steel plate on the load-bearing bracket;

[0022] ② Start the lifting mechanism, which drives the injection hopper down until the pressure rod under the injection hopper presses the steel plate, so that the steel plate is pressed and fixed on the bearing bracket. At this time, the filling nozzle at the bottom of the injection hopper enters the injection hole of the steel plate;

[0023] (c) Placement of the cylindrical column:

[0024] ① Place the round pipe column horizontally into the sleeve on the working platform, and support the round pipe column through the pipe clamp under the sleeve;

[0025] ②Install the center positioning mechanism at the end of the round tube column;

[0026] (d) Alignment:

[0027] ①Slide the fixed brackets on both sides of the rack to the center position;

[0028] ② Turn on the infrared laser on the fixed bracket so that the infrared light emitted by the infrared laser shines on the inner disk of the center positioning mechanism;

[0029] ③ Rotate the pipe clamp at the bottom of the sleeve to drive the round pipe column to rise and fall through the pipe clamp at the bottom, and adjust the height position of the round pipe column in the sleeve until the infrared light emitted by the infrared laser shines on the center mark of the inner disk; ④ Rotate the pipe clamp at the top of the sleeve to make the pipe clamp at the top press against the round pipe column;

[0030] (e) Docking: Start the push-pull mechanism, which drives the working platform forward, and the round tube column follows the working platform forward, so that the round tube column is inserted into the stepped groove of the steel plate until the end surface of the round tube column contacts the bottom surface of the second groove of the stepped groove;

[0031] (f) Pouring:

[0032] ①Pour the molten solder into the filling hopper, and the solder flows out from the filling nozzle and flows into the filling hole of the steel plate, and then flows out through the material guide channel and flows into the second groove, so that the solder fills the second groove;

[0033] ② After the feeding is completed, the lifting mechanism is started again, and the lifting mechanism drives the filling hopper to rise, so that the filling nozzle is separated from the filling hole, and then the filling hole is blocked;

[0034] (g) Molding:

[0035] ① Wait for the solder to cool naturally to room temperature, and after the solder solidifies, a welding ring is formed in the second groove, and the steel plate and the round tube columns on both sides are welded into one, and the steel column is formed;

[0036] ② Rotate the upper clamping fitting in the opposite direction to separate it from the round pipe column, and start the push-pull mechanism again. The push-pull mechanism drives the working platform backward to separate the sleeve from the round pipe column and remove the steel column.

[0037] Furthermore, the installation method of the center positioning mechanism in step (c) is: first squeeze the outer foot inward so that the outer foot squeezes the spring, and the expansion range of the center positioning mechanism becomes smaller, and then put it into the end of the circular tube column. After relaxing the outer foot, the outer foot is expanded outward by the rebound force of the spring, and is close to the inner wall of the circular tube column, so that the center positioning mechanism is limited in the circular tube column.

[0038] Furthermore, in step (f), during the process of adding solder, the servo motor on the working platform is started, the servo motor drives the transmission gear to rotate, and the transmission gear drives the gear ring on the sleeve to rotate, so that the sleeve rotates. The rotating sleeve continuously stirs the solder, thereby improving the fluidity of the solder in the second groove, facilitating the solder filling to be dense, and the structural strength of the solder ring after being formed is higher, thereby playing a role in strengthening the connection.

[0039] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0040] 1. Place the steel plate: first put the steel plate on the bearing bracket, which is convenient for positioning and easy to install. The steel plate will not deflect circumferentially and has high stability. Then start the lifting mechanism to drive the injection hopper down, so that the pressure rod presses the steel plate down to prevent the steel plate from moving upward, effectively fix the steel plate, and avoid the steel plate from loosening freely and affecting the accurate connection between the steel plate and the round pipe column.

[0041] 2. Place the round tube column: put the round tube column into the sleeve, rotate the tube clamp at the bottom of the sleeve, drive the round tube column to rise and fall through the tube clamp at the bottom, adjust the height position of the round tube column in the sleeve, make the infrared light emitted by the infrared laser shine on the center mark of the inner disk, the center mark is on the central axis of the round tube column, the infrared light emitted by the infrared laser coincides with the central axis of the round tube column, then the center point of the stepped groove of the steel plate is on the central axis of the round tube column, accurately aligning it, so as to facilitate the subsequent smooth docking of the round tube column and the steel plate.

[0042] 3. Docking of steel plate and round tube column: The push-pull mechanism drives the working platform forward, and the round tube column follows the working platform forward, so that the round tube column is inserted into the stepped groove of the steel plate, replacing manual docking, reducing labor intensity, saving effort and being convenient.

[0043] 4. During the process of pouring solder, the rotating sleeve continuously stirs the solder, which improves the fluidity of the solder and facilitates dense filling of the solder. After the welding ring is formed, the structural strength is higher, which can play a role in strengthening the connection; after the solder solidifies, a welding ring is formed, and the welding ring welds the steel plate and the round tube column on both sides into one body. The steel plate and the round tube column are connected by the welding ring, with a large contact area, high connection strength, and a more stable forming structure, replacing the manual handheld welding method of the welding gun, with low operation requirements, high efficiency and convenience, no solder splashing, and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention will be further described below in conjunction with the accompanying drawings:

[0045] Figure 1 It is a structural schematic diagram of the welding equipment in the present invention;

[0046] Figure 2 for Figure 1 Left view of

[0047] Figure 3 for Figure 1 The main view;

[0048] Figure 4 It is a schematic diagram of the structure of the connection between the sleeve and the branch pipe seat in the present invention;

[0049] Figure 5 It is a schematic diagram of the installation of the steel plate in the present invention;

[0050] Figure 6 It is a structural schematic diagram of the center positioning mechanism in the present invention;

[0051] Figure 7 Schematic diagram of the internal structure of the steel plate in the present invention;

[0052] Figure 8 It is a schematic diagram of the internal structure of the steel column in the present invention.

[0053] In the figure: 1-frame; 2-infrared laser; 3-center positioning mechanism; 4-first bracket; 5-second bracket; 6-guide rod; 7-storage box; 8-bearing bracket; 9-first stroke cylinder; 10-working platform; 11-base; 12-branch seat; 13-sleeve; 14-servo motor; 15-transmission gear; 16-gear ring; 17-second stroke cylinder; 18-filling hopper; 19-filling nozzle; 20-handle screw; 2 1- clamping plate; 22- screw sleeve; 23- round tube column; 24- positioning column; 25- outer edge; 26- pressure rod; 27- steel plate; 28- inner plate; 29- telescopic tube; 30- outer foot; 31- center mark; 32- extension bracket; 33- fixed bracket; 34- first slideway; 35- second slideway; 36- stepped groove; 37- first groove; 38- second groove; 39- injection hole; 40- material guide channel; 41- positioning concave hole. DETAILED DESCRIPTION

[0054] like Figures 1 to 6 As shown, a steel structure welding device for construction engineering in the present invention includes: a frame 1, an infrared laser 2 and a center positioning mechanism 3. The frame 1 is provided with a first bracket 4, a second bracket 5, a guide rod 6, a storage box 7 and a bearing bracket 8. The storage box 7 is used to store the center positioning mechanism 3 to prevent loss and facilitate management.

[0055] A working platform 10 is slidably connected between the guide rods 6, and a base 11 and a branch pipe seat 12 are provided on the working platform 10. A sleeve 13 is rotatably connected to the branch pipe seat 12. A servo motor 14 is provided on the base 11, and the servo motor 14 is connected to a transmission gear 15. A gear ring 16 is provided on the sleeve 13, and the gear ring 16 is meshed with the transmission gear 15.

[0056] The first bracket 4 is provided with a push-pull mechanism, which adopts a first stroke cylinder 9. The output end of the first stroke cylinder 9 is connected to a working platform 10. The push-pull mechanism drives the working platform 10 to perform horizontal linear motion.

[0057] The second bracket 5 is provided with a lifting mechanism, which adopts a second stroke cylinder 17. The output end of the second stroke cylinder 17 is connected to a filling hopper 18. A filling nozzle 19 is provided at the bottom of the filling hopper 18. The filling nozzle 19 is located above the supporting bracket 8. The lifting mechanism drives the filling hopper 18 to perform lifting movements.

[0058] The sleeve 13 is connected with a pipe clamp, which includes a handle screw 20 and a clamp 21. The handle screw 20 is rotatably connected to the clamp 21. The clamp 21 is located in the sleeve 13. The sleeve 13 is provided with a screw sleeve 22, which is threadedly connected to the handle screw 20. Rotating the handle screw 20 can drive the clamp 21 to rise and fall, change the distance between the upper and lower clamps 21, and can adapt to round pipe columns 23 of different diameters, with strong adaptability.

[0059] Both ends of the clamping plate 21 are bent, which increases the contact area with the circular tube column 23, thereby improving the clamping effect.

[0060] A positioning column 24 is disposed on the supporting bracket 8 , and the cross-sectional shape of the positioning column 24 is a rectangle.

[0061] The material injection hopper 18 is provided with an outer edge portion 25 , and a pressure rod 26 is provided at the bottom of the outer edge portion 25 .

[0062] The center positioning mechanism 3 includes an inner plate 28, a spring, a telescopic tube 29 and an outer foot 30. The spring and the telescopic tube 29 are arranged between the inner plate 28 and the outer foot 30. The spring is located in the telescopic tube 29 to protect the spring. A center mark 31 corresponding to the infrared laser 2 is arranged at the center of the inner plate 28. The expansion range of the center positioning mechanism 3 is flexible and adjustable, and can be adapted to circular tubes 23 of different diameters, and has strong adaptability.

[0063] An extension bracket 32 ​​is provided on both sides of the frame 1, and a slide is provided on the extension bracket 32. A fixed bracket 33 is slidably connected in the slide. The infrared laser 2 is fixed on the fixed bracket 33. The slide includes a first slide 34 and a second slide 35. The first slide 34 is connected to the second slide 35. The horizontal center line of the second slide 35 is in the same plane as the central axis of the sleeve 13.

[0064] When the infrared laser 2 is working, the fixed bracket 33 is located in the second slide 35; when the infrared laser 2 is idle, the fixed bracket 33 is located in the first slide 34. The position of the fixed bracket 33 is flexibly adjustable, will not affect the installation of the circular tube column 23, and is easy to operate.

[0065] A welding method for a steel structure for construction engineering comprises the following steps:

[0066] (a) Prepare the round tube column 23 and the steel plate 27: Figure 7 As shown, the top and bottom surfaces of the steel plate 27 are provided with stepped grooves 36, and the stepped grooves 36 include a first groove 37 and a second groove 38. The first groove 37 is connected to the second groove 38, and the cross-sectional diameter of the first groove 37 is smaller than the cross-sectional diameter of the second groove 38. The first groove 37 and the circular tube column 23 are clearance-fitted. An injection hole 39 is provided on one side of the steel plate 27, and a material guide channel 40 is provided between the injection hole 39 and the second groove 38. A positioning recessed hole 41 is provided on the other side of the steel plate 27, and the positioning column 24 corresponds to the positioning recessed hole 41.

[0067] (b) Installing the steel plate 27:

[0068] ① Put the positioning concave hole 41 of the steel plate 27 into the positioning column 24 on the bearing bracket 8, so that the steel plate 27 can be quickly positioned on the bearing bracket 8. The positioning is convenient and the operation is simple. The steel plate 27 will not deflect circumferentially. The bearing bracket 8 provides support for the steel plate 27, which is stable and reliable.

[0069] ② Start the lifting mechanism, which drives the injection hopper 18 to descend until the pressure rod 26 under the injection hopper 18 presses the steel plate 27, so that the steel plate 27 is pressed and fixed on the supporting bracket 8 to prevent the steel plate 27 from moving upward, thereby effectively fixing the steel plate 27 and preventing the steel plate 27 from loosening freely and affecting the accurate connection between the steel plate 27 and the circular tube column 23.

[0070] At this time, the filling nozzle 19 at the bottom of the filling hopper 18 enters the filling hole 39 of the steel plate 27. The steel plate 27 is pressed and fixed, and the filling nozzle 19 is extended into the filling hole 39, without step-by-step operation, and it is efficient and convenient.

[0071] (c) Installing the cylindrical column 23:

[0072] ① Place the round tube column 23 horizontally into the sleeve 13 on the working platform 10, and support the round tube column 23 through the clamping plate 21 under the sleeve 13;

[0073] ② Install the center positioning mechanism 3 at the end of the circular tube column 23, specifically: first squeeze the outer foot 30 inwards, so that the outer foot 30 squeezes the spring, the expansion range of the center positioning mechanism 3 becomes smaller, and then put it into the end of the circular tube column 23, and after the outer foot 30 is relaxed, the outer foot 30 is subjected to the rebound force of the spring and expands outwards, close to the inner wall of the circular tube column 23, so that the center positioning mechanism 3 is limited in the circular tube column 23. The outer feet 30 in multiple directions are in close contact with the inner wall of the circular tube column 23 at the same time, and there is a large friction force, which limits the free movement of the center positioning mechanism 3 and has high installation stability.

[0074] (d) Alignment:

[0075] ① Slide the fixed brackets 33 on both sides of the rack 1 from the first slide 34 to the second slide 35, so that the fixed brackets 33 reach the centering position, and the infrared rays emitted by the infrared laser 2 and the center point of the stepped groove 36 are preset to be in the same plane.

[0076] ② Turn on the infrared laser 2 on the fixed bracket 33 so that the infrared light emitted by the infrared laser 2 is irradiated on the inner disk 28 of the center positioning mechanism 3.

[0077] ③ Rotate the pipe clamp under the sleeve 13 to drive the round pipe column 23 to rise and fall through the clamping plate 21 below, and adjust the height position of the round pipe column 23 in the sleeve 13 until the infrared light emitted by the infrared laser 2 irradiates the center mark 31 of the inner disk 28.

[0078] The center mark 31 is located on the central axis of the circular tube column 23. The infrared rays emitted by the infrared laser 2 coincide with the central axis of the circular tube column 23. The center point of the stepped groove 36 is located on the central axis of the circular tube column 23, which is precisely aligned, thereby facilitating the subsequent smooth docking of the circular tube column 23 and the steel plate 27.

[0079] ④ Rotate the pipe clamp above the sleeve 13 so that the upper clamping plate 21 abuts against the circular tube column 23, clamping and fixing the circular tube column 23 to prevent the circular tube column 23 from moving freely.

[0080] (e) Docking: Start the push-pull mechanism, which drives the working platform 10 forward, and the round tube column 23 follows the working platform 10 forward, so that the round tube column 23 is inserted into the stepped groove 36 of the steel plate 27 until the end surface of the round tube column 23 contacts the bottom surface of the second groove 38 of the stepped groove 36. This replaces manual docking, reduces labor intensity, saves effort and is convenient.

[0081] The connection between the first groove 37 and the circular tube column 23 is sealed to prevent the subsequently added solder from flowing out of the gap.

[0082] (f) Pouring:

[0083] ①Pour the molten solder into the injection hopper 18, the solder flows out from the injection nozzle 19 and flows into the injection hole 39 of the steel plate 27, then flows out through the guide channel 40 and flows into the second groove 38, so that the solder fills the second groove 38, and wipes off the solder overflowing from the steel plate 27, which is the solder generated by the melting of the brazing wire. The solder filling is easy and easy to operate.

[0084] The servo motor 14 is started, and the servo motor 14 drives the transmission gear 15 to rotate, and the transmission gear 15 drives the ring gear 16 on the sleeve 13 to rotate, so that the sleeve 13 rotates.

[0085] The rotating sleeve 13 continuously stirs the solder, thereby improving the fluidity of the solder in the second groove 38, facilitating the dense filling of the solder, and making the structural strength of the solder ring higher after being formed, thereby playing a role in strengthening the connection.

[0086] ② After the feeding is completed, the lifting mechanism is started again, and the lifting mechanism drives the injection hopper 18 to rise, so that the filling nozzle 19 is separated from the injection hole 39, and then the injection hole 39 is blocked.

[0087] (g) Molding:

[0088] ① Wait for the solder to cool naturally to room temperature, and after the solder solidifies, a welding ring is formed in the second groove 38, and the steel plate 27 and the round tube columns 23 on both sides are welded into one body, and the steel column is formed, such as Figure 8 The steel plate 27 and the round tube column 23 are connected by a welding ring, which has a large contact area, high connection strength, and a more stable structure. It replaces the manual welding method of a handheld welding gun, has low operation requirements, is efficient and convenient, has no solder splashing, and is highly safe.

[0089] ② Rotate the upper clamping piece in the opposite direction to separate the upper clamping plate 21 from the round tube column 23, and start the push-pull mechanism again. The push-pull mechanism drives the working platform 10 to retreat, so that the sleeve 13 is separated from the round tube column 23, and the steel column is removed.

[0090] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A steel structure welding equipment for construction engineering, characterized in that: include: frame; A working platform slidably connected to the frame, the working platform is connected to a sleeve, the sleeve is connected to a pipe clamp, and the pipe clamp is used to clamp a round pipe column; A push-pull mechanism is arranged on the frame, the output end of the push-pull mechanism is connected to the working platform, and the push-pull mechanism drives the working platform to perform horizontal linear motion; A load-bearing bracket arranged on the frame, wherein the load-bearing bracket is provided with a positioning column, and the positioning column corresponds to the positioning concave hole of the steel plate; A lifting mechanism is arranged on the frame, the output end of the lifting mechanism is connected to a filling hopper, the lifting mechanism drives the filling hopper to do lifting movement, a filling nozzle is arranged at the bottom of the filling hopper, and the filling nozzle is located above the supporting bracket; an infrared laser slidably connected to the frame; A center positioning mechanism is used to be installed in a circular tube column, and the center positioning mechanism is provided with a center mark corresponding to the infrared laser.

2. The steel structure welding equipment for construction engineering according to claim 1 is characterized in that: The center positioning mechanism includes an inner disk, a spring, a telescopic tube and an outer foot. The spring and the telescopic tube are both arranged between the inner disk and the outer foot. The spring is located in the telescopic tube. The center mark is arranged at the center of the inner disk.

3. The steel structure welding equipment for construction engineering according to claim 1 is characterized in that: The pipe clamping member comprises a handle screw and a clamping plate, the handle screw is rotatably connected to the clamping plate, the clamping plate is located in the sleeve, and the sleeve is threadedly connected to the handle screw.

4. The steel structure welding equipment for construction engineering according to claim 1 is characterized in that: The injection hopper is provided with an outer edge portion, and a pressure rod is provided at the bottom of the outer edge portion. The pressure rod is used to press the steel plate onto the bearing bracket.

5. The steel structure welding equipment for construction engineering according to claim 1 is characterized by: The working platform is provided with a servo motor and a pipe support seat, the sleeve passes through and is rotatably connected to the pipe support seat, the servo motor is connected to a transmission gear, the sleeve is provided with a gear ring, and the gear ring is meshed and connected with the transmission gear.

6. The steel structure welding equipment for construction engineering according to claim 1, characterized in that: The frame is provided with a slideway, a fixed bracket is slidably connected in the slideway, the infrared laser is fixed on the fixed bracket, the slideway includes a first slideway and a second slideway, the first slideway is connected to the second slideway, and the horizontal center line of the second slideway and the center axis of the sleeve are located in the same plane; When the infrared laser is working, the fixing bracket is located in the second slideway; When the infrared laser is idle, the fixing bracket is located in the first slideway.

7. A welding method for steel structure for construction engineering, characterized in that The steps include: (a) preparing a circular tube column and a steel plate: the top and bottom surfaces of the steel plate are both provided with stepped grooves, the stepped grooves comprising a first groove and a second groove, the first groove being connected to the second groove, the cross-sectional diameter of the first groove being smaller than the cross-sectional diameter of the second groove, the first groove corresponding to the circular tube column, a material injection hole being provided on one side of the steel plate, a material guide channel being provided between the material injection hole and the second groove, and a positioning recessed hole being provided on the other side of the steel plate; (b) Installation of steel plates: ① Put the positioning concave hole of the steel plate onto the positioning column on the load-bearing bracket to position the steel plate on the load-bearing bracket; ② Start the lifting mechanism, which drives the injection hopper down until the pressure rod under the injection hopper presses the steel plate, so that the steel plate is pressed and fixed on the bearing bracket. At this time, the filling nozzle at the bottom of the injection hopper enters the injection hole of the steel plate; (c) Placement of the cylindrical column: ① Place the round pipe column horizontally into the sleeve on the working platform, and support the round pipe column through the pipe clamp under the sleeve; ②Install the center positioning mechanism at the end of the round tube column; (d) Alignment: ①Slide the fixed brackets on both sides of the rack to the center position; ② Turn on the infrared laser on the fixed bracket so that the infrared light emitted by the infrared laser shines on the inner disk of the center positioning mechanism; ③ Turn the pipe clamp under the sleeve to drive the round pipe column up and down through the pipe clamp below, and adjust the height position of the round pipe column in the sleeve until the infrared light emitted by the infrared laser shines on the center mark of the inner disk; ④ Rotate the pipe clamp above the sleeve so that the pipe clamp above is against the round pipe column; (e) Docking: Start the push-pull mechanism, which drives the working platform forward, and the round tube column follows the working platform forward, so that the round tube column is inserted into the stepped groove of the steel plate until the end surface of the round tube column contacts the bottom surface of the second groove of the stepped groove; (f) Pouring: ①Pour the molten solder into the filling hopper, and the solder flows out from the filling nozzle and flows into the filling hole of the steel plate, and then flows out through the material guide channel and flows into the second groove, so that the solder fills the second groove; ② After the feeding is completed, the lifting mechanism is started again, and the lifting mechanism drives the filling hopper to rise, so that the filling nozzle is separated from the filling hole, and then the filling hole is blocked; (g) Molding: ① Wait for the solder to cool naturally to room temperature, and after the solder solidifies, a welding ring is formed in the second groove, and the steel plate and the round tube columns on both sides are welded into one, and the steel column is formed; ② Rotate the upper pipe clamp in the opposite direction to separate it from the round pipe column, start the push-pull mechanism again, and the push-pull mechanism will drive the working platform backward to separate the sleeve from the round pipe column and remove the steel column.

8. A welding method for steel structure for construction engineering according to claim 7, characterized in that: The installation method of the center positioning mechanism in step (c) is: first squeeze the outer foot inward so that the outer foot squeezes the spring, and the expansion range of the center positioning mechanism becomes smaller, and then put it into the end of the circular tube column. After relaxing the outer foot, the outer foot is expanded outward by the rebound force of the spring and fits tightly against the inner wall of the circular tube column, so that the center positioning mechanism is limited in the circular tube column.

9. A welding method for steel structure for construction engineering according to claim 7, characterized in that: In step (f), during the process of adding solder, the servo motor on the working platform is started, the servo motor drives the transmission gear to rotate, and the transmission gear drives the gear ring on the sleeve to rotate, so that the sleeve rotates.

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