Welding positioning device for building steel structure

Abstract

The invention relates to the technical field of steel structure welding, in particular to a building steel structure welding positioning device which comprises a machine table and a plurality of conveying units installed on the machine table. A centering mechanism used for centering a positioning steel structure is further arranged in the middle of the machine table, an expansion frame is fixed to one end of the machine table, and a die fixing mechanism used for installing a base plate is arranged on the expansion frame. Wherein the side edge, close to the expanding frame, of the machine table is further provided with a clamping and pushing mechanism used for positioning a stiffening plate. Through the design of the centering mechanism, the mold fixing mechanism and the clamping and pushing mechanism, the requirement for sequentially and continuously assembling a steel structure of a steel structure column foot, a base plate and the stiffening plate can be met; and the positioning accuracy and convenience of welding machining of the steel structure column foot are improved, and the efficient production requirement of a production line can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of steel structure welding, and in particular to a welding positioning device for building steel structures. Background Art

[0002] The steel column base is an important load-bearing component in a steel structure building, and its quality directly affects the stability and safety of the entire building structure. The steel column base generally includes a steel structure, such as an H-shaped steel, as well as a backing plate and a stiffening plate connected between the steel structure and the backing plate. Each component is formed by welding to form a firm connection.

[0003] In the current production process of steel column bases, the positioning link before welding mainly involves workers using tools such as a tape measure to measure the H-shaped steel, backing plate, and stiffening plate, determine their relative positional relationships, mark the welding positions on the components, and then perform welding operations according to the marked positions.

[0004] However, for the welding method based on manual measurement and positioning, the measurement and marking processes are not only cumbersome and time-consuming, unable to meet the requirements of modern industrial production for high-speed processing, but also prone to measurement errors in the manual measurement method, thus affecting the accuracy of the welding position.

[0005] Therefore, there is an urgent need for an efficient and accurate welding positioning device to improve the production efficiency and quality of steel column bases. Summary of the Invention

[0006] The purpose of the present invention is to solve the disadvantages in the prior art that the manual measurement and positioning process is cumbersome and time-consuming and cannot meet the requirements of modern industrial production for high-speed processing, and to propose a welding positioning device for building steel structures.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] Design a welding positioning device for building steel structures, including:

[0009] A machine table and a plurality of conveying units installed on the machine table;

[0010] In the middle of the machine table, there is also a centering mechanism for centering and positioning the steel structure. An extension frame is fixed at one end of the machine table, and a die positioning mechanism for installing the backing plate is arranged on the extension frame;

[0011] Wherein, a clamping and pushing mechanism for positioning the stiffening plate is also installed on the side of the machine table close to the extension frame.

[0012] Further, the conveying unit includes a mounting seat fixed on the machine table, and a rotating shaft is rotatably connected above the mounting seat;

[0013] A roller shaft is sleeved outside the rotating shaft, and compression springs are movably connected between the two ends of the roller shaft and the two ends of the rotating shaft.

[0014] Furthermore, the centering mechanism includes two longitudinal plate members installed in the middle of the machine table frame. A connecting seat is fixedly connected between the middles of the two longitudinal plate members. Two sliding seats are slidably connected above the two longitudinal plate members. A guiding component is arranged above the sliding seats, and the two sliding seats move synchronously through a synchronizing component.

[0015] Furthermore, the synchronizing component includes a driving plate rotatably connected to the middle of the connecting seat. Both ends of the driving plate and the two sliding seats are connected by pin shafts. A pushing member is also fixedly installed on the side of the longitudinal plate member, and the telescopic end of the pushing member is connected to the side of the sliding seat.

[0016] Furthermore, the guiding component includes a number of guide rollers vertically rotatably installed on the sliding seat. A motor is fixedly installed at the bottom of the sliding seat, and the shaft end of the motor is fixed to the shaft end of one of the guide rollers.

[0017] Furthermore, the die setting mechanism includes a U-shaped plate installed in the expansion frame. A die base is fixedly installed at the front end of the U-shaped plate, and positioning columns adapted to the mounting holes of the backing plate are fixed on the end face of the die base;

[0018] One-word grooves are formed on both bent ends of the U-shaped plate, and the U-shaped plate is connected to the expansion frame through the one-word grooves and fasteners.

[0019] Furthermore, a welding protection mechanism is also provided on the U-shaped plate;

[0020] The welding protection mechanism includes a conductive column passing through the U-shaped plate and the die base. A spring is fixedly connected between the conductive column and the U-shaped plate;

[0021] A conductive sheet is fixedly connected to the back end of the expansion frame through an insulating member, and the conductive sheet is used to connect the grounding pin of the welding machine.

[0022] Furthermore, the clamping and pushing mechanism includes a support rod connected to the side of the machine table. A U-shaped rod is fixedly installed at the far end of the support rod. An upper support rod is rotatably connected to the open side of the U-shaped rod. The U-shaped rod and the upper support rod form an annular structural member. The support rod is connected to the conductive sheet through a wire;

[0023] Pulley clamps are installed on the three bent sections of the U-shaped rod and the upper support rod, and the pulley clamps are used to position the stiffening plate between the steel structure and the backing plate.

[0024] Further, the pulley splint includes a U-shaped clamp, and two rollers are rotatably connected inside the U-shaped clamp. The center line connection of the two rollers is horizontal with the hypotenuse line of the stiffening plate.

[0025] Wherein a jacket is further installed on the outer sides of the U-shaped rod and the upper support rod, and the U-shaped clamp is fixed to the jacket through a rod.

[0026] Further, one side of the top of the U-shaped rod is rotatably connected with an upper support rod. A positioning glass bead is embedded on the end face of the upper support rod, and a bayonet for clamping the telescopic end of the positioning glass bead is provided at the end of the U-shaped rod.

[0027] A welding positioning device for a building steel structure proposed by the present invention has the beneficial effects that: through the design of the centering mechanism, the die-setting mechanism and the clamping and pushing mechanism in the present invention, the sequential continuous assembly of the steel structure, the backing plate and the stiffening plate of the steel column foot can be satisfied, the positioning accuracy and convenience of the welding process of the steel column foot can be improved, and the high-efficiency production requirements of the production line can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a three-dimensional view of the present invention Figure 1 ;

[0029] Figure 2 is a three-dimensional view of the present invention Figure 2 ;

[0030] Figure 3 is a schematic structural view of the conveying unit of the present invention;

[0031] Figure 4 is a schematic structural view of the centering mechanism of the present invention;

[0032] Figure 5 is a schematic structural view of the die-setting mechanism of the present invention;

[0033] Figure 6 is a schematic structural view of the clamping and pushing mechanism of the present invention;

[0034] Figure 7 is a front view of the clamping and pushing mechanism of the present invention;

[0035] Figure 8 is a schematic structural view of the pulley splint of the present invention;

[0036] Figure 9 is a state diagram of the steel structure and the backing plate during positioning of the present invention;

[0037] Figure 10 is a state diagram of the steel structure, the backing plate and the stiffening plate during positioning of the present invention;

[0038] Figure 11Isometric view of the steel structure, backing plate and stiffening plate of the present invention during positioning;

[0039] Figure 12 Is Figure 11 Enlarged structural schematic diagram of area A of;

[0040] Figure 13 Schematic diagram of the hoisting position after welding of the steel structure, backing plate and stiffening plate of the present invention;

[0041] Figure 14 Is Figure 13 Enlarged structural schematic diagram of area B of.

[0042] In the figure: 1, machine table; 2, conveying unit; 21, mounting seat; 22, rotating shaft; 23, roller shaft; 24, compression spring; 3, centering mechanism; 31, longitudinal plate member; 32, connecting seat; 33, sliding seat; 34, guiding component; 341, guide roller; 342, motor; 35, driving plate; 36, pin shaft; 37, pushing member; 4, extension frame; 5, die setting mechanism; 51, U-shaped plate; 52, die seat; 53, positioning column; 54, slotted hole; 6, clamping and pushing mechanism; 61, support rod; 62, U-shaped rod; 63, upper support rod; 64, pulley clamping plate; 641, U-shaped clamp; 642, roller; 643, clamping sleeve; 644, rod member; 645, concave convex; 65, positioning bead; 66, bayonet; 7, welding protection mechanism; 71, conductive column; 72, spring; 73, insulating part; 74, conductive sheet; Ⅰ, steel structure; Ⅱ, backing plate; Ⅲ, stiffening plate. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0044] Refer to Figure 1-14 For an embodiment of the present invention, it discloses a welding positioning device for building steel structures. Refer to Figure 1 、 Figure 2 , specifically, the positioning device includes a machine table 1 and a plurality of conveying units 2 installed on the machine table 1. The plurality of conveying units 2 are used to carry the steel structure Ⅰ and at the same time provide the ability for the steel structure Ⅰ to move linearly;

[0045] In the middle of the machine table 1, there is also a centering mechanism 3 for centering and positioning the steel structure I. An extension frame 4 is fixed at one end of the machine table 1, and a die positioning mechanism 5 for installing the backing plate II is arranged on the extension frame 4. The backing plate II is positioned by the die positioning mechanism 5. First, the steel structure I is hoisted above the plurality of conveying units 2. After that, when the steel structure I is conveyed forward, its end will touch the backing plate II. After the steel structure I and the backing plate II are in surface contact, the welding work on the backing plate II can be carried out.

[0046] Refer to Figure 10 It should be noted that in this embodiment, the front view of the extension frame 4 is in an L-shaped structure, and a clearance opening is constructed between it and the side of the machine table 1. The design of this clearance opening is to provide a welding space. In this way, during the subsequent welding process, the four sides of the steel structure I, the backing plate II, and the stiffening plate III can be welded at this clearance opening.

[0047] A clamping and pushing mechanism 6 for positioning the stiffening plate III is also installed on the side of the machine table 1 close to the extension frame 4. Similarly, the clamping and pushing mechanism 6 in this embodiment is used to position the stiffening plate III, so as to facilitate subsequent welding between the steel structure I and the backing plate II. In this way, the positioning and welding operation of the entire steel structure foot column can be completed.

[0048] Refer to Figure 3 , in some embodiments, the conveying unit 2 in the present invention includes a mounting seat 21 fixed on the machine table 1. The mounting seat 21 in this embodiment is set as a U-shaped channel steel. A rotating shaft 22 is rotatably connected above the mounting seat 21. Two bearing seats are fixedly installed at the upper end of the mounting seat 21, and both ends of the rotating shaft 22 are connected in the two bearing seats.

[0049] A roller shaft 23 is sleeved outside the rotating shaft 22, and compression springs 24 are movably connected between both ends of the roller shaft 23 and both ends of the rotating shaft 22. It should be noted that in the embodiment of the present invention, the roller shaft 23 and the rotating shaft 22 can slide horizontally. The design purpose of adopting this structure is to provide the purpose of horizontal movement of the steel structure I when centering and positioning the steel structure I subsequently. Of course, in this embodiment, the compression spring 24 is used to maintain the centered position of the roller shaft 23 in the initial state. After the operation is completed, the compression spring 24 provides a push to drive the roller shaft 23 to reset to the middle of the rotating shaft 22.

[0050] Furthermore, in this embodiment, in order to ensure the compression stability of the compression spring 24, two gaskets can also be sleeved outside the rotating shaft 22. The compression spring 24 is placed between the two gaskets. Through the design of the two gaskets, the force stability at both ends of the compression spring 24 can be improved.

[0051] In addition, the mounting base 21 described in this embodiment is fixed above the machine table 1 through fasteners such as bolts, and its position can be adjusted adaptively according to the length of the steel structure I to be positioned. In this embodiment, the conveying unit 2 is preferably configured with three. With the design of three conveying units 2, the stable loading and conveying of the steel structure I can be ensured.

[0052] Referring to Figure 4 , preferably, in the present invention, the centering mechanism 3 includes two longitudinal plate members 31 installed in the middle of the frame of the machine table 1. The longitudinal plate members 31 are fixedly connected to the frame of the machine table 1. A connecting seat 32 is fixedly connected between the middles of the two longitudinal plate members 31. Two sliding seats 33 are slidably connected above the two longitudinal plate members 31. The sliding seats 33 are slidably connected to the longitudinal plate members 31 through a guide rail and slider structure. A guiding component 34 is arranged above the sliding seats 33. The guiding component 34 is used to drive the steel structure I to move horizontally after centering it. Of course, in order to realize the synchronous driving of the two sliding seats 33, in this embodiment, the two sliding seats 33 are synchronously moved through a synchronous component.

[0053] Referring to Figure 4 , on the basis of the above embodiment, in this embodiment, the synchronous component includes a driving plate 35 rotatably connected to the middle of the connecting seat 32. Both ends of the driving plate 35 are connected to the two sliding seats 33 through pin shafts 36. Of course, both ends of the pin shaft 36 are rotatably connected to the driving plate 35 and the sliding seats 33. A pushing member 37 is also fixedly installed on the side of the longitudinal plate member 31. The telescopic end of the pushing member 37 is connected to the side of the sliding seat 33. Preferably, the pushing member 37 described in this embodiment is set as a hydraulic cylinder.

[0054] Referring to Figure 4 , further, in the present invention, the guiding component 34 includes a plurality of guide rollers 341 vertically rotatably arranged on the sliding seats 33. A motor 342 is fixedly installed at the bottom of the sliding seats 33. The shaft end of the motor 342 is fixed to the shaft end of one of the guide rollers 341. The motor 342 is arranged to drive one of the guide rollers 341 to rotate, so as to achieve the driving of the front-back movement of the steel structure I.

[0055] In the specific operation process, first, the steel structure I is hoisted onto the plurality of conveying units 2. The pushing member 37 drives one of the sliding seats 33 to move and approach the steel structure I. Since the two sliding seats 33 are kept in synchronous movement through the driving plate 35 and the pin shafts 36, the other sliding seat 33 also makes a synchronous approaching movement.

[0056] When the two sliding seats 33 continue to move towards each other, a number of guide rollers 341 on their tops will abut against both sides of the steel structure I and drive the steel structure I to be centered and positioned at the central axis position of the machine table 1. At this time, since the guide rollers 341 are tightly clamped on the outside of the steel structure I, when the lateral movement control of the steel structure I is required, the motor 342 can be used to drive the corresponding guide rollers 341 to rotate, and the lateral movement control of the steel structure I can be completed.

[0057] Referring to Figure 5 , in some embodiments, the die setting mechanism 5 described in the present invention includes a U-shaped plate 51 installed in the expansion frame 4. A die base 52 is fixedly installed at the front end of the U-shaped plate 51, and a positioning column 53 adapted to the mounting holes of the second backing plate is fixed on the end face of the die base 52;

[0058] Those skilled in the art know that since four mounting holes are reserved at the four corners of the end face of the second backing plate to facilitate connection with the connecting columns on the foundation, the present invention uses this structural feature to realize the positioning connection of the second backing plate;

[0059] Specifically, in this embodiment, by adopting the design of the die base 52 configured with the positioning column 53, the second backing plate can be directly inserted on the four positioning columns 53 of the die base 52 during the positioning process, so that the second backing plate can be quickly positioned. In addition, the die base 52 described in this embodiment can be fixed on the U-shaped plate 51 by bolts. Therefore, for different types of the second backing plates, the corresponding die base 52 can be replaced.

[0060] Referring to Figure 5 , in addition, considering that the central positions of the steel structures I with different heights are different, the height position of the die base 52 also needs to be adjusted. Specifically, in this embodiment, one-word slots 54 are opened on both bent ends of the U-shaped plate 51. The U-shaped plate 51 is connected to the expansion frame 4 through the one-word slots 54 and fasteners. Of course, the fasteners described in this embodiment can be set as bolts, and the bolts are slidably connected to the one-word slots 54. When locked, the height position of the U-shaped plate 51 can be locked and fixed to maintain the alignment between the second backing plate and the steel structure I after installation.

[0061] Referring to Figure 2 、 Figure 5 , on the basis of the above embodiments, the present invention further includes a welding protection mechanism 7 provided on the U-shaped plate 51;

[0062] The welding protection mechanism 7 includes a conductive column 71 passing through the U-shaped plate 51 and the die base 52, and a spring 72 is fixedly connected between the conductive column 71 and the U-shaped plate 51;

[0063] A conductive sheet 74 is fixedly connected to the back end of the expansion frame 4 through an insulating member 73. The conductive sheet 74 is used to connect the grounding pin of the welding machine. Specifically, in this embodiment, the insulating member 73 is an insulating gasket. Of course, this insulating gasket is connected between the expansion frame 4 and the conductive sheet 74. The specific method can be fixed by plastic bolts to ensure the insulation between the conductive sheet 74 and the expansion frame 4.

[0064] Since one pin of the welding machine needs to be grounded during operation to form a current loop on the workpiece during welding. In this embodiment, considering the protection of welding operations, the provided conductive sheet 74 is used to connect the grounding pin of the welding machine. Since the conductive sheet 74 and the expansion frame 4 are insulated by the insulating member 73, in the initial connection state, even if the welding electrode of the welding machine touches the steel structure I or the backing plate II, a current loop cannot be formed.

[0065] Refer to Figure 9 , until when the steel structure I is transported forward and touches the backing plate II. At this time, the steel structure I will push the backing plate II to move backward by a certain distance. During the movement of the backing plate II, it will push the conductive column 71 to move backward. When the conductive column 71 moves backward, it will contact the conductive sheet 74. At this time, the grounding pin of the welding machine will be electrically connected to the steel structure I or the backing plate II. When the welding electrode touches the steel structure I or the backing plate II, a current loop is formed, and thus the welding operation can be realized.

[0066] With this design method, when the steel structure I does not touch the backing plate II, the welding machine cannot form a current loop. Therefore, even if the welding torch accidentally touches, no welding action will occur, which greatly ensures the stability and safety of welding.

[0067] Refer to Figure 6 , Figure 7 , in a further embodiment, the clamping and pushing mechanism 6 in the present invention includes a support rod 61 connected to the side of the machine table 1. A U-shaped rod 62 is fixedly installed at the distal end of the support rod 61. The open side of the U-shaped rod 62 is rotatably connected to an upper support rod 63. The U-shaped rod 62 and the upper support rod 63 form an annular structural member. The support rod 61 is connected to the conductive sheet 74 through a wire. Of course, the overall formed by the U-shaped rod 62 and the upper support rod 63 in the present invention can also be replaced. Different annular structural members can be replaced according to the steel structure I of different sizes.

[0068] Among them, pulley clamps 64 are installed on the three bent sections of the U-shaped rod 62 and the upper support rod 63. The pulley clamps 64 are used to position the stiffening plate III between the steel structure I and the backing plate II. It should be noted that in the state where the stiffening plate III is not installed, the pulley clamps 64 do not contact the steel structure I. Therefore, the electrical connection between the support rod 61 and the conductive sheet 74 will not affect the protection ability of the welding protection mechanism 7.

[0069] Referring to Figure 8 , on the basis of the above embodiments, in the present invention, the pulley clamp 64 includes a U-shaped clamp 641, and two rollers 642 are rotatably connected inside the U-shaped clamp 641. The center line connecting the centers of the two rollers 642 is horizontal with the hypotenuse line of the stiffening plate III;

[0070] A jacket 643 is also installed on the outer sides of the U-shaped rod 62 and the upper support rod 63. The U-shaped clamp 641 is fixed to the jacket 643 through a rod 644. In this embodiment, the jacket 643 is composed of two semi-circular rings, and the two semi-circular rings can be connected and fixed through locking parts such as bolts.

[0071] It should be noted that the support rod 61, the U-shaped clamp 641, and the rod 644 in the present invention are all set as conductive parts such as iron parts. During the welding of the welding backing plate II, the user can also install and position multiple stiffening plates III. Specifically, by inserting the stiffening plate III inside each U-shaped clamp 641 and having one side abutted against the side wall of the steel structure I, continuous loading is performed to complete the installation and positioning of multiple stiffening plates III to be welded. In addition, the opening width of the U-shaped clamp 641 in this embodiment is adapted to the stiffening plate III to ensure the clamping stability of the stiffening plate III. Referring to Figure 8 , at least one concave protrusion 645 can also be provided in the middle of the U-shaped clamp 641. Through the elastic clamping force of the concave protrusion 645 on the stiffening plate III, the clamping and fitting stability of the stiffening plate III can be further improved, and at the same time, the conduction stability of the entire circuit is ensured;

[0072] Referring to Figure 10 、 Figure 11 , when the steel structure I and the backing plate II are welded, at this time, the guide roller 341 can be driven to reverse by the motor 342, so as to pull the steel structure I and the welded backing plate II to move backward. Referring to Figure 12 , until the backing plate II abuts against several stiffening plates III. Since the stiffening plate III and the rollers 642 inside the U-shaped clamp 641 adopt an inclined surface matching method, under the abutment of the backing plate II, the stiffening plate III will closely fit between the steel structure I and the corner of the backing plate II to complete the welding position positioning of the stiffening plate III.

[0073] As described above, when pad II and conductive column 71 are separated, conductive column 71 will be separated from conductive sheet 74 under the push of spring 72. At this time, the grounding pin of the welding machine cannot be turned on. In order to realize the subsequent welding of pad II, in this embodiment, the support rod 61 is connected to the conductive sheet 74 through a wire. When the steel structure I carries pad II and collides with stiffening plate III, a current path is formed between steel structure I, pad II, stiffening plate III, U-shaped clip 641, U-shaped rod 62, support rod 61 and conductive sheet 74. When the welding rod is spot welded at the connection of stiffening plate III, current conduction can be realized.

[0074] Reference Figure 7 It should be noted that, in this embodiment, the top side of the U-shaped rod 62 is rotatably connected to an upper support rod 63, a positioning glass bead 65 is embedded on the end surface of the upper support rod 63, and the end of the U-shaped rod 62 is provided with a bayonet 66 that is engaged with the telescopic end of the positioning glass bead 65.

[0075] That is, when the positioning stiffening plate III is installed, the upper support rod 63 is fixed on the U-shaped rod 62 by the cooperation of the positioning glass beads 65 and the bayonet 66. Since the steel structure I, the pad II and the stiffening plate III need to be hoisted and transferred after being welded into a complete steel structure column foot, in order to avoid the upper support rod 63 interfering with the hoisting of the entire steel structure column foot, in this embodiment, the upper support rod 63 is designed to be rotatably connected;

[0076] Reference Figure 13 , Figure 14 After the specific welding is completed, the steel structure column foot can be connected to the lifting equipment, and the telescopic end of the positioning glass bead 65 can be pressed to disengage it from the bayonet 66. At this time, the entire upper support rod 63 can be freely flipped to deviate from the upper side of the steel structure column foot. After that, the steel structure column foot can be freely hoisted, and then the upper support rod 63 can be reset to continue positioning and welding the various groups of components of the next group of steel structure column feet.

[0077] It can be seen that the steel structure foot column of the present invention needs to perform three moving actions during the overall welding, that is, the steel structure I first moves forward to contact and weld with the pad II, and then the steel structure I cooperates with the pad II to move backward to contact and weld with the stiffening plate III. Finally, after the welding is completed, the steel structure foot column moves forward a small distance to ensure that the stiffening plate III and the U-shaped clamp 641 are separated, thereby ensuring the reliability of the lifting and transfer.

[0078] In summary, the designs of the centering mechanism 3, the molding mechanism 5 and the clamping and pushing mechanism 6 in the present invention can meet the sequential assembly of the steel structure I, the pad II and the stiffening plate III of the steel structure column foot, improve the positioning accuracy and convenience of the welding processing of the steel structure column foot, and meet the efficient production needs of the production line.

[0079] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A welding positioning device for a building steel structure, characterized in that, Including: A machine platform (1) and a plurality of conveying units (2) installed on the machine platform (1); In the middle of the machine platform (1), there is also a centering mechanism (3) for centering and positioning the steel structure (Ⅰ). An extension frame (4) is fixed at one end of the machine platform (1), and a die setting mechanism (5) for installing the backing plate (Ⅱ) is arranged on the extension frame (4); Wherein, a clamping and pushing mechanism (6) for positioning the stiffening plate (Ⅲ) is also installed on the side of the machine platform (1) close to the extension frame (4).

2. The welding positioning device for a building steel structure according to claim 1, wherein: The conveying unit (2) includes a mounting seat (21) fixed on the machine platform (1), and a rotating shaft (22) is rotatably connected above the mounting seat (21); Wherein, a roller shaft (23) is sleeved outside the rotating shaft (22), and compression springs (24) are movably connected between the two ends of the roller shaft (23) and the two ends of the rotating shaft (22).

3. The welding positioning device for a building steel structure according to claim 1, wherein: The centering mechanism (3) includes two longitudinal plate members (31) installed in the middle of the frame of the machine platform (1). A connecting seat (32) is fixedly connected between the middles of the two longitudinal plate members (31). Two sliding seats (33) are slidably connected above the two longitudinal plate members (31). A guiding component (34) is arranged above the sliding seats (33), and the two sliding seats (33) move synchronously through a synchronous component.

4. The welding positioning device for a building steel structure according to claim 3 is characterized in that: The synchronous component includes a driving plate (35) rotatably connected to the middle of the connecting seat (32). Both ends of the driving plate (35) are connected to the two sliding seats (33) through pin shafts (36). A pushing member (37) is also fixedly installed on the side of the longitudinal plate member (31), and the telescopic end of the pushing member (37) is connected to the side of the sliding seat (33).

5. The welding positioning device for a building steel structure according to claim 3, characterized in that: The guiding component (34) includes a plurality of guide rollers (341) vertically rotatably installed on the sliding seat (33). A motor (342) is fixedly installed at the bottom of the sliding seat (33), and the shaft end of the motor (342) is fixed to the shaft end of one of the guide rollers (341).

6. The welding positioning device for a building steel structure according to claim 1, wherein: The die setting mechanism (5) includes a U-shaped plate (51) installed in the extension frame (4). A die base (52) is fixedly installed at the front end of the U-shaped plate (51), and a positioning column (53) adapted to the mounting holes of the backing plate (Ⅱ) is fixed on the end face of the die base (52); One-word grooves (54) are opened on both bent ends of the U-shaped plate (51), and the U-shaped plate (51) is connected to the extension frame (4) through the one-word grooves (54) and fasteners.

7. A welding positioning device for a building steel structure according to claim 6, characterized in that: It also includes a welding protection mechanism (7) arranged on the U-shaped plate (51); The welding protection mechanism (7) includes a conductive column (71) passing through the U-shaped plate (51) and the die base (52), and a spring (72) is fixedly connected between the conductive column (71) and the U-shaped plate (51); A conductive sheet (74) is fixedly connected to the back end of the extension frame (4) through an insulating member (73), and the conductive sheet (74) is used to connect the grounding pin of the welding machine.

8. The welding positioning device for a building steel structure according to claim 7, wherein: The clamping and pushing mechanism (6) includes a support rod (61) connected to the side of the machine table (1). A U-shaped rod (62) is fixedly installed at the distal end of the support rod (61). An upper support rod (63) is rotatably connected to the open side of the U-shaped rod (62). The U-shaped rod (62) and the upper support rod (63) form an annular structural member. The support rod (61) is connected to a conductive sheet (74) through a wire. Among them, pulley clamps (64) are installed on the three bent sections of the U-shaped rod (62) and the upper support rod (63). The pulley clamps (64) are used to position the stiffening plate (Ⅲ) between the steel structure (Ⅰ) and the backing plate (Ⅱ).

9. The welding positioning device for a building steel structure according to claim 8, characterized in that: The pulley clamp (64) includes a U-shaped clamp (641). Two rollers (642) are rotatably connected inside the U-shaped clamp (641). The center line connecting the centers of the two rollers (642) is horizontal with the hypotenuse line of the stiffening plate (Ⅲ). Among them, clamping sleeves (643) are further installed on the outer sides of the U-shaped rod (62) and the upper support rod (63). The U-shaped clamp (641) is fixed to the clamping sleeve (643) through a rod (644).

10. A welding positioning device for a building steel structure according to claim 8, characterized in that: An upper support rod (63) is rotatably connected to one side of the top of the U-shaped rod (62). A positioning glass bead (65) is embedded in the end face of the upper support rod (63). A bayonet (66) for engaging with the telescopic end of the positioning glass bead (65) is provided at the end of the U-shaped rod (62).

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