A roundness coincidence device for welding of circular tubular steel structures and a working method thereof

Abstract

The invention discloses a roundness coincidence device for welding of circular tubular steel structures and a working method thereof, comprising a roundness coincidence device; the roundness coincidence device comprises a magnetic adsorption device and a top pressure regulating column, the top pressure regulating column is connected to one side of the magnetic adsorption device through a connecting arm, and the top pressure regulating column is vertically connected to the connecting arm; when the magnetic adsorption device is adsorbed on the circumference of a first connecting steel pipe close to a second connecting steel pipe, the axis of the top pressure regulating column extends along the radial direction of the second connecting steel pipe; the top pressure regulating column can be adjusted along its own axial direction relative to the connecting arm, so that the end of the top pressure regulating column can be pressed onto the circumference of the second connecting steel pipe close to the first connecting steel pipe; the magnetic adsorption device and the top pressure regulating column ensure that different circular tubular steel structures have the same roundness after welding, and the method of adsorbing and installing on the circular tubular steel structure by the magnetic adsorption device will not cause damage to the circular tubular steel structure during use, and is also suitable for welding work of circular tubular steel structures of any pipe diameter.

Description

Technical Field

[0001] The invention belongs to the technical field of welding assistance, and more specifically relates to a roundness coincidence device for welding a circular tubular steel structure and a working method thereof. Background Art

[0002] Circular tubular steel structures are often used in span building structures. Therefore, when connecting different pipe sections, it is necessary to ensure that the roundness of the different pipe sections after welding is the same. The traditional method is to install chucks on the two pipe sections, or weld temporary brackets on the pipe sections to ensure that the two pipe sections have the same roundness after welding. However, chucks are not suitable for pipe sections with larger radii. The brackets need to be continuously welded to the surface of the pipe section or cut from the surface of the pipe section as the welding points change. The pipe section is deformed due to excessive local temperature. More seriously, the structure of the pipe section may change and break during use. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a roundness coincidence device for circular tubular steel structure welding and a working method thereof. While ensuring that the roundness of different circular tubular steel structure sections tends to be the same after welding, not only will the circular tubular steel structure not be damaged during use, but the device is also suitable for welding circular tubular steel structures of any diameter.

[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides a roundness overlap device for welding circular tubular steel structures and a working method thereof, comprising a first connecting steel pipe and a second connecting steel pipe, the second connecting steel pipe being coaxially spliced ​​at one end of the first connecting steel pipe, and also comprising a roundness overlap device; the roundness overlap device comprises a magnetic adsorption device and a top pressure adjustment column, the top pressure adjustment column is connected to one side of the magnetic adsorption device through a connecting arm, and the top pressure adjustment column is vertically connected to the connecting arm; when the magnetic adsorption device is adsorbed on the circumferential surface of the first connecting steel pipe close to the second connecting steel pipe, the axis of the top pressure adjustment column extends along the radial direction of the second connecting steel pipe; the top pressure adjustment column can be adjusted along its own axial direction relative to the connecting arm, so that the end of the top pressure adjustment column can be pressed onto the circumferential surface of the second connecting steel pipe close to the first connecting steel pipe.

[0005] Furthermore, one end of the connected arm is connected to the upper end of the magnetic adsorption device, and the other end is fixedly connected to a nut A that cooperates with the top pressure adjusting column; when the lower end of the top pressure adjusting column presses against the circumference of the second connecting steel pipe close to the first connecting steel pipe, the radial adjustment of the top pressure adjusting column relative to the A nut can press the circumference of the second connecting steel pipe down to overlap with the circumference of the first connecting steel pipe.

[0006] Furthermore, the top pressure adjusting column is a threaded column, and an A-threaded top pressure adjusting column is provided on the top pressure adjusting column, which is threadedly matched with the A-nut thread on the connecting arm; when the lower end of the top pressure adjusting column is pressed against the circumferential surface of the second connecting steel pipe close to the first connecting steel pipe, the threaded cooperation between the A-nut and the A-thread can prevent the top pressure adjusting column from moving toward the connecting arm under the action of the second connecting steel pipe.

[0007] Furthermore, a section of the top pressure adjusting column provided with an A thread is a first section of the threaded column, the lower end of the first section of the threaded column is integrally connected with a second section of the threaded column, the second section of the threaded column is provided with a B thread, and the pitch of the B thread is greater than the pitch of the A thread; it also includes an arc-shaped plate, on which a B nut matching the B thread on the top pressure adjusting column is provided, and the B nut thread is matched on the second section of the threaded column; the top pressure adjusting column is adjusted relative to the connecting arm along its own axial direction, so that the lower arc surface of the arc plate is attached to and pressed against the circumferential surface of the second connecting steel pipe, and the relative movement speed between the top pressure adjusting column and the A nut is slower than the relative movement speed between the arc plate and the top pressure adjusting column.

[0008] Furthermore, a guide rod is provided on the side of the arc plate away from the B nut, and a guide hole is opened on the end of the connecting arm away from the magnetic adsorption device, and the guide rod slides in the guide hole; when the B nut on the arc plate is threadedly engaged with the B thread at the lower end of the top pressure adjusting column, the sliding engagement between the guide rod and the guide hole guides the relative movement between the arc plate and the top pressure adjusting column.

[0009] Furthermore, when a plurality of roundness coincidence devices are simultaneously adsorbed on the first connecting steel pipe in a circular array, two adjacent roundness coincidence devices are connected by a detachable arc-shaped connecting bracket, and each top pressure adjusting column is adjusted in the same direction and equidistantly along its own axial direction, so that the lower arc surfaces of each arc-shaped plate connected to each top pressure adjusting column are simultaneously attached to and pressed against the circumferential surface of the second connecting steel pipe. At this time, the circle formed by the connecting lines between the contact points of each magnetic adsorption device and the circumferential surface of the first connecting steel pipe is concentric with the circle formed by the connecting lines between the lower arc-shaped surfaces of each arc-shaped plate. Therefore, when the lower arc-shaped surfaces of each arc-shaped plate connected to each top pressure adjusting column are simultaneously attached to the circumferential surface of the second connecting steel pipe, the cooperation of each magnetic adsorption device, each arc-shaped plate and each arc-shaped connecting bracket can ensure that the axis of the first connecting steel pipe and the axis of the second connecting steel pipe are located on the same straight line.

[0010] Further, a working method of a roundness coincidence device for welding a circular tubular steel structure:

[0011] Step 1: Place the first connecting steel pipe and the second connecting steel pipe on the working platform, and splice them coaxially, and install the magnetic adsorption device on the circumference of the first connecting steel pipe close to the second connecting steel pipe;

[0012] Step 2: Control the top pressure regulating column to continue to adjust along its own axial direction relative to the connecting arm until the lower end of the top pressure regulating column contacts the circumference of the second connecting steel pipe, and weld the overlapping areas of the circumference of the first connecting steel pipe and the circumference of the second connecting steel pipe in sequence along the circumference of the splicing point; the position where the magnetic adsorption device is adsorbed on the first connecting pipe changes as the welding process proceeds;

[0013] Step 3: When the lower end of the top pressure adjustment column contacts the position of the protrusion on the circumference of the second connecting steel pipe, the top pressure adjustment column is controlled to continue to be adjusted along its own axial direction relative to the connecting arm, so that the lower end of the top pressure adjustment column presses the circumference of the position of the protrusion on the second connecting steel pipe downward until it overlaps with the circumference of the first connecting steel pipe;

[0014] Step 4: In the state of step 3, welding is performed on the area where the circumference of the first connecting steel pipe and the circumference of the second connecting steel pipe overlap;

[0015] Step 5: Repeat steps 2 to 4 until a section of the second connecting steel pipe close to the first connecting steel pipe is completely welded to the first connecting steel pipe.

[0016] Further, a working method of a roundness coincidence device for welding a circular tubular steel structure:

[0017] Step 1: Place the first connecting steel pipe and the second connecting steel pipe on the working platform and splice them coaxially, and adsorb and install a plurality of roundness coincidence devices connected with arc plates on the circumference of the first connecting steel pipe close to the second connecting steel pipe;

[0018] Step 2: Connecting an arc-shaped connecting bracket between two adjacent roundness coincidence devices;

[0019] Step 3: Control the top pressure regulating column to continue to adjust along its own axial direction in the same direction and at equal distances relative to the connecting arm until each arc plate presses against the circumferential surface of the second connecting steel pipe;

[0020] Step 4: In the state of step 3, welding the overlapping portion of the circumference of the first connecting steel pipe and the circumference of the second connecting steel pipe;

[0021] Step 5: After completing step 4, first remove each arc-shaped connecting bracket from each roundness coincidence device, and then remove each roundness coincidence device from the first connecting steel pipe;

[0022] Step 6: Adsorb a roundness coincidence device on the circumference of the first connecting steel pipe close to the second connecting steel pipe, and make the lower end of the top pressure regulating column be located above a protrusion on the circumference of the second connecting steel pipe;

[0023] Step 7: In the state of step 6, the top pressure adjusting column is controlled to continue to adjust along its own axial direction relative to the connecting arm, so that the lower end of the top pressure adjusting column presses down the tube wall where the protrusion on the second connecting steel pipe is located until it overlaps with the first connecting steel pipe, and the arc plate moves along the axial direction of the top pressure adjusting column to the upper end of the B thread;

[0024] Step 8: In the state of step 7, after welding a protrusion on the circumference of the second connecting steel pipe to the first connecting steel pipe, the roundness coincidence device is then transferred to the lower end of the top pressure adjustment column and located above the next protrusion on the circumference of the second connecting steel pipe, and the magnetic adsorption device is adsorbed on the circumference of the first connecting steel pipe close to the second connecting steel pipe;

[0025] Step 9: Repeat steps 7 to 8 until the second connecting steel pipe is welded to the first connecting steel pipe.

[0026] Beneficial effects: The roundness coincidence device and working method for circular tubular steel structure welding of the present invention ensure that the roundness of different circular tubular steel structure sections after welding tends to be the same through a magnetic adsorption device and a top pressure adjustment column. The method of adsorbing and installing the circular tubular steel structure through a magnetic adsorption device will not damage the circular tubular steel structure during use, and is also suitable for welding circular tubular steel structures of any diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a roundness coincidence device in the first embodiment of the present invention;

[0028] Figure 2 It is a structural schematic diagram of a roundness coincidence device in a second embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of the coaxial splicing of the first connecting steel pipe and the second connecting steel pipe in the second embodiment of the present invention;

[0030] Figure 4 It is an axial diagram of the coaxial splicing of the first connecting steel pipe and the second connecting steel pipe in the second embodiment of the present invention;

[0031] Figure 5 An axial view of the coaxial splicing of the first connecting steel pipe and the second connecting steel pipe;

[0032] Figure 6 A is a partial enlarged view. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] As attached Figure 1As shown, a roundness coincidence device for welding a circular tubular steel structure and a working method thereof, comprising a first connecting steel pipe 1 and a second connecting steel pipe 2, wherein the maximum pipe diameters of the first connecting steel pipe 1 and the second connecting steel pipe 2 are the same, and the second connecting steel pipe 2 is coaxially spliced ​​at one end of the first connecting steel pipe 1; further comprising a roundness coincidence device 3, wherein the roundness coincidence device 3 comprises a magnetic adsorption device 4 and a top pressure regulating column 6, wherein the magnetic adsorption device 4 is a permanent magnetic suction cup, wherein the top pressure regulating column 6 is connected to one side of the magnetic adsorption device 4 through a connecting arm 7, and the top pressure regulating column 6 is vertically connected to the connecting arm 7, and a control handle 9 is provided on the side of the magnetic adsorption device 4 away from the top pressure regulating column 6, wherein the control handle 9 controls the magnetic size of the magnetic adsorption device 4, and when the magnetic adsorption device 4 needs to be adsorbed, the magnetic adsorption device 4 is increased by rotating the control handle 9. The magnetism of the magnetic adsorption device 4 is thereby adsorbed on the adsorbed object; when the magnetic adsorption device 4 needs to be moved, the magnetism of the magnetic adsorption device 4 is reduced by rotating the control handle 9, thereby separating the magnetic adsorption device 4 from the adsorbed object; when the magnetic adsorption device 4 is adsorbed on the circumferential surface of the first connecting steel pipe 1 close to the second connecting steel pipe 2, the axis of the top pressure adjusting column 6 extends along the radial direction of the second connecting steel pipe 2; the top pressure adjusting column 6 can be adjusted along its own axial direction relative to the connecting arm 7, and the adjustment of the top pressure adjusting column 6 along its own axial direction close to the axis of the second connecting steel pipe 2 is set as positive adjustment, and the adjustment of the top pressure adjusting column 6 along its own axial direction away from the axis of the second connecting steel pipe 2 is set as reverse adjustment. The positive adjustment of the top pressure adjusting column 6 enables the end of the top pressure adjusting column 6 to be pressed onto the circumferential surface of the second connecting steel pipe 2 close to the first connecting steel pipe 1.

[0035] The strength of the connecting arm 7 is higher than that of the first connecting steel pipe 1 and the second connecting steel pipe 2, and one end of the connecting arm 7 is connected to the upper end of the magnetic adsorption device 4, and the other end is fixedly connected to an A nut 8 that matches the top pressure adjustment column 6, and the top pressure adjustment column 6 can be adjusted along its own axial direction relative to the A nut 8; when the lower end of the top pressure adjustment column 6 is pressed against the circumferential surface of the second connecting steel pipe 2 close to the first connecting steel pipe 1, the magnetic adsorption device 4 is fixedly connected to the first connecting pipe 1, the connecting arm 7 is fixedly connected to the magnetic adsorption device 4, the A nut 8 is fixed to the connecting arm 7, and because the second connecting steel pipe The strength of the tube 2 is lower than that of the connecting arm 7. At this time, if the top pressure adjusting column 6 continues to be adjusted forward, the cooperation between the A nut 8 and the top pressure adjusting column 6 can ensure that when the top tower adjusting column 6 is adjusted forward, the tube wall in contact with the top pressure adjusting column 6 of the second connecting tube 2 will deform before the connecting arm 7; therefore, the radial adjustment of the top pressure adjusting column 6 relative to the A nut 8 can press the protrusion 16 on the circumference of the second connecting steel tube 2 protruding from the circumference contour of the first connecting steel tube 1 down to coincide with the circumference of the first connecting steel tube 1; that is, the lower end of the top pressure adjusting column 6 presses the tube wall of the second connecting steel tube 2 toward the direction close to the axis of the second connecting steel tube 2.

[0036] like Figure 5 As shown, since the roundness of the first connecting steel pipe 1 and the second connecting steel pipe 2 is different, the circumferential contour of the first connecting steel pipe 1 and the circumferential contour of the second connecting steel pipe 2 do not completely overlap in the spliced ​​state, so the top pressure adjustment column 6 and the A nut 8 should be threadedly matched, so that when the top pressure adjustment column 6 is positively adjusted, the lower end of the top pressure adjustment column 6 exerts a greater force on the second connecting steel pipe 2; in this embodiment, the top pressure adjustment column 6 is a threaded column, and the top pressure adjustment column 6 is provided with an A thread 6a, and the top pressure adjustment column 6 is connected to the connecting arm 7 through the A thread 6a The A nut 8 on it is threadedly matched; when the tube wall of the second connecting steel pipe 2 is pressed toward the direction close to the axis of the second connecting steel pipe 2 at the end of the top pressure adjusting column 6, the tube wall of the second connecting steel pipe 2 has an opposite force on the top pressure adjusting column 6, and the threaded match between the A nut 8 and the A thread 6a can prevent the top pressure adjusting column 6 from moving toward the direction close to the connecting arm 7 under the action of the second connecting steel pipe 2; the head end of the top pressure adjusting column 6 is vertically connected to a rotating rod 15, and the worker drives the top pressure adjusting column 6 to rotate around its own axis through the rotating rod 15, so that the A thread 6a on the top pressure adjusting column 6 is threadedly matched with the A nut 8; Figure 6 As shown, the area where the circumference of the second connecting steel pipe 2 does not overlap with the circumference of the first connecting steel pipe 1 is a protrusion 16. When the lower end of the top pressure adjusting column 6 is pressed against the circumference of the second connecting steel pipe 2 close to the first connecting steel pipe 1, the top pressure adjusting column 6 can be radially adjusted relative to the A nut 8 to press the protrusion 16 on the circumference of the second connecting steel pipe 2 down to overlap with the circumference of the first connecting steel pipe 1.

[0037] A working method of a roundness coincidence device for welding a circular tubular steel structure:

[0038] Step 1: Place the first connecting steel pipe 1 and the second connecting steel pipe 2 on the working platform and splice them coaxially, and adsorb and install the magnetic adsorption device 4 on the circumferential surface of the first connecting steel pipe 1 close to the second connecting steel pipe 2; at this time, the axis of the top pressure adjusting column 6 extends along the radial direction of the second connecting steel pipe 2.

[0039] Step 2: Control the top pressure regulating column 6 to continue to adjust along its own axial direction relative to the connecting arm 7 until the lower end of the top pressure regulating column 6 contacts the circumference of the second connecting steel pipe 2, and weld the overlapping areas of the circumference of the first connecting steel pipe 1 and the circumference of the second connecting steel pipe 2 in sequence along a circle of the joint; the position of the magnetic adsorption device 4 adsorbed on the first connecting pipe 1 changes as the welding process proceeds; the lower end of the top pressure regulating column 6 contacts all positions of the circumference of the second connecting pipe 2 close to one end of the first connecting pipe 1 in sequence as the welding process proceeds; when welding, the worker first selects a welding point in the overlapping area of ​​the circumference of the first connecting steel pipe 1 and the circumference of the second connecting steel pipe 2 for spot welding, and marks the welding point as the starting welding point. The worker starts from the starting welding point and welds in sequence along a circle of the joint of the first connecting steel pipe 1 and the second connecting steel pipe 2.

[0040] Step three: When the lower end of the top pressure adjusting column 6 contacts the position of the protrusion 16 on the circumference of the second connecting steel pipe 2, the top pressure adjusting column 6 is controlled to continue to adjust along its own axial direction relative to the connecting arm 7, so that the lower end of the top pressure adjusting column 6 presses down the circumference of the second connecting steel pipe 2 where the protrusion 16 is located until it overlaps with the circumference of the first connecting steel pipe 1.

[0041] Step 4: In the state of step 3, the area where the circumference of the first connecting steel pipe 1 and the circumference of the second connecting steel pipe 2 overlap is welded.

[0042] Step 5: Repeat steps 2 to 4 until a section of the second connecting steel pipe 2 close to the first connecting steel pipe 1 is completely welded to the first connecting steel pipe 1 .

[0043] The above content is the first embodiment of the present invention. In the first embodiment, the coaxiality of the first connecting steel pipe 1 and the second connecting steel pipe 2 is completely controlled manually by the welding worker. Therefore, the overlap degree between the axis of the first connecting steel pipe 1 and the axis of the second connecting steel pipe 2 is low, resulting in too many protrusions 16 on the circumferential surface of the second connecting steel pipe 2 that need to be coincident in roundness by the circularity coincidence device 3. In the first embodiment, the welding starts from a certain point at the contact point of the first connecting steel pipe 1 and the second connecting steel pipe 2, and the spot welding is carried out successively along the circumference of the contact point. Therefore, during the welding process, the tube wall at the protrusion 16 on the circumferential surface of the second connecting steel pipe 2 is pressed against the first connecting steel pipe by the circularity coincidence device 3. 1, the degree of deviation between the axis of the first connecting steel pipe 1 and the axis of the second connecting steel pipe 2 may be further aggravated, and finally result in that when the last welding point on the circumference of the second connecting steel pipe 2 needs to be welded, the deviation between the contour of the protrusion 16 on the circumference of the second connecting steel pipe 2 at the location of the last few welding points and the circumference contour of the first connecting steel pipe 1 is too large. At this time, if the protrusion 16 on the circumference of the second connecting steel pipe 2 at the location of the last few welding points is forcibly pressed down through the roundness overlap device 3 until it overlaps with the circumference contour of the first connecting steel pipe 1, the contact point on the circumference of the second connecting steel pipe 2 with the lower end of the top pressure adjusting column 6 may cause the second connecting steel pipe 2 to break due to excessive load.

[0044] In order to avoid the above-mentioned problems, it is first necessary to ensure that the axis of the first connecting steel pipe 1 and the axis of the second connecting steel pipe 2 are basically in the same straight line before welding, and on the basis that the axis of the first connecting steel pipe 1 and the axis of the second connecting steel pipe 2 are in the same straight line, first weld the welding points in the overlapping area of ​​the circumferential contour of the first connecting steel pipe 1 and the circumferential contour of the second connecting steel pipe 2. At this time, the deviation between the protrusions 16 on the circumference of the second connecting steel pipe 2 and the circumference of the first connecting steel pipe 1 is only the protrusion height of each protrusion 16 itself. Therefore, the problem of excessive deviation between the contour of the protrusion 16 on the circumference of the second connecting steel pipe 2 and the circumferential contour of the first connecting steel pipe 1 in the first embodiment will not occur. On this basis, the position of the protrusions 16 on the circumference of the second connecting steel pipe 2 is pressed by the pressing adjusting column 6 to overlap the circumference of the first connecting steel pipe 1 and welded, thereby proposing a second embodiment of the present invention.

[0045] In the second embodiment, if Figure 2As shown, a section of the threaded column with A thread 6a on the top pressure regulating column 6 is the first section of the threaded column, the lower end of the first section of the threaded column is integrally connected with the second section of the threaded column, and the second section of the threaded column is provided with B thread 6b, and the pitch of the B thread 6b is greater than the pitch of the A thread 6a; the second section of the threaded column of the top pressure regulating column 6 is movably connected with an arc plate 12, and the lower arc surface of the arc plate 12 has the same radius as the circumference of the second connecting steel pipe 2. The top pressure regulating column 6 is adjusted along its own axial direction relative to the connecting arm 7, so that the lower arc surface of the arc plate 12 can fit and press against the second connecting steel pipe 2 On the circumferential surface of the arc plate 12, a B nut 13 is provided which cooperates with the B thread 6b on the top pressure adjusting column 6. The B nut 13 is threadedly engaged with the second section threaded column. The threaded engagement of the B thread 6b and the B nut 13 enables the arc plate 12 to move relative to the top pressure adjusting column 6 along the axial direction of the top pressure adjusting column 6. Since the pitch of the B thread 6b is greater than the pitch of the A thread 6a, when the top pressure adjusting column 6 is adjusted relative to the connecting arm 7 along its own axial direction, the movement speed of the top pressure adjusting column 6 relative to the A nut 8 is slower than the movement speed of the arc plate 12 relative to the top pressure adjusting column 6.

[0046] A guide rod 11 is provided on the side of the arc plate 12 away from the B nut 13, and the guide rod 11 guides the relative movement between the arc plate 12 and the top pressure adjustment column 6; when the top pressure adjustment column 6 is adjusted along its own axial direction relative to the connecting arm 7, the guide rod 11 can prevent the arc plate 12 from rotating with the rotation of the top pressure adjustment column 6, thereby ensuring that when the top pressure adjustment column 6 is adjusted along its own axial direction relative to the connecting arm 7, the B nut 13 can effectively threadably cooperate with the B thread 6b on the top pressure adjustment column 6, thereby allowing the arc plate 12 to move along the axial direction of the top pressure adjustment column 6.

[0047] During the process of positive adjustment of the top pressure regulating column 6 relative to the connecting arm 7, since the A nut 8 is fixed on the connecting arm 7, the lower end of the top pressure regulating column 6 will move away from the connecting arm 7 and the A nut 8 along its own axial direction; since the arc plate 12 cannot rotate with the rotation of the top pressure regulating column 6 under the action of the guide rod 11, the lower end of the top pressure regulating column 6 will also move away from the B nut 13 along its own axial direction, but since the guide tube 11 is only slidably fitted in the guide hole 10, the threaded fit between the B nut 13 and the top pressure regulating column 6 can make the arc plate 12 synchronously approach the connecting arm 7 along the axial direction of the top pressure regulating column 6; during the process of reverse adjustment of the top pressure regulating column 6 relative to the connecting arm 7, since the A nut 8 is fixed on the connecting arm 7, the lower end of the top pressure regulating column 6 will It approaches the connecting arm 7 and the A nut 8 along its own axial direction; since the arc plate 12 cannot rotate with the rotation of the top pressure adjusting column 6 under the action of the guide rod 11, the lower end of the top pressure adjusting column 6 will also approach the B nut 13 along its own axial direction, but since the guide tube 11 is only slidably fitted in the guide hole 10, the threaded fit between the B nut 13 and the top pressure adjusting column 6 can make the arc plate 12 synchronously move away from the connecting arm 7 along the axial direction of the top pressure adjusting column 6 until the lower arc surface of the arc plate 12 is pressed against the circumferential surface of the second connecting steel pipe 2; therefore, when the arc plate 12 needs to be clamped on the circumferential surface of the second connecting steel pipe 2, the top pressure adjusting column 6 is controlled to be reversely adjusted relative to the connecting arm 7, and when welding is required, the top pressure adjusting column 6 is controlled to be forwardly adjusted relative to the connecting arm 7.

[0048] A guide hole 10 is provided at one end of the connecting arm 7 away from the magnetic adsorption device 4. When the B nut 13 on the arc plate 12 is threadedly engaged with the B thread 6b at the lower end of the top pressure adjusting column 6, the guide rod 11 slides relative to the guide hole 10; when the lower arc surface of the arc plate 12 is pressed against the circumferential surface of the second connecting steel pipe 2, the upper end of the second guide tube 11 passes through the guide hole 10 and is located above the connecting arm 7; an observation port is provided on the arc plate 12. When the top pressure adjusting column 6 is controlled to be positively adjusted relative to the connecting arm 7, the arc plate 12 moves along the axial direction of the top pressure adjusting column 6 to the upper end of the B thread 6b, and the worker can observe the situation at the welding point from the observation port, thereby avoiding the arc plate 12 blocking the field of vision during welding.

[0049] like Figure 3 and 4As shown, a plurality of roundness coincidence devices 3 are arranged in a circular array and adsorbed on the first connecting steel pipe 1 at the same time, and two adjacent roundness coincidence devices 3 are connected by a detachable arc-shaped connecting bracket 14, and the two ends of each arc-shaped connecting bracket 14 are detachably connected to the side of two adjacent magnetic adsorption devices 4 close to each other. At this time, each arc-shaped connecting bracket 14 and each magnetic adsorption device 4 together constitute a circular ring coaxial with the first connecting steel pipe 1; each top pressure adjusting column 6 is adjusted in the same direction and equidistantly along its own axial direction, so that the lower arc surface of each arc plate 12 connected to each top pressure adjusting column 6 is simultaneously attached and pressed against the circumferential surface of the second connecting steel pipe 2, so that each arc plate 12 clamps the second connecting steel pipe 2 together. At this time, since each top pressure adjusting column 6 is adjusted in the same direction and equidistantly along its own axial direction, each arc plate 12 and its corresponding magnetic adsorption device The relative distances between the positions 4 are equal, so the circle formed by the lines between the contact points of the magnetic adsorption part 4 and the circumferential surface of the first connecting steel pipe 1 is concentric with the circle formed by the lines between the lower arc surfaces of each arc plate 12, and since the circle formed by the lines between the contact points of the magnetic adsorption part 4 of each of the roundness coincidence devices 3 and the circumferential surface of the first connecting steel pipe 1 is coaxial with the first connecting steel pipe 1, and the circle formed by the lines between the lower arc surfaces of each arc plate 12 is coaxial with the second connecting steel pipe 2, in this state, the axis of the first connecting steel pipe 1 and the axis of the second connecting steel pipe 2 are on the same straight line. It can be determined that when the lower arc surfaces of each arc plate 12 connected to each top pressure adjusting column 6 are simultaneously attached to the circumferential surface of the second connecting steel pipe 2, the cooperation of each of the magnetic adsorption devices 4, each top pressure adjusting column, each arc plate 12 and each arc connecting bracket 14 can ensure that the axis of the first connecting steel pipe 1 and the axis of the second connecting steel pipe 2 are on the same straight line.

[0050] A working method of a roundness coincidence device for welding a circular tubular steel structure,

[0051] Step 1: Place the first connecting steel pipe 1 and the second connecting steel pipe 2 on the working platform and splice them coaxially. A plurality of roundness coincidence devices 3 connected with arc plates 12 are adsorbed and installed on the circumference of the first connecting steel pipe 1 close to the second connecting steel pipe 2; at this time, the axis of each top pressure regulating column 6 extends along the radial direction of the second connecting steel pipe 2;

[0052] Step 2: Connect the arc-shaped connecting bracket 14 between two adjacent roundness coincidence devices 3 ; thereby each arc-shaped connecting bracket 14 and the magnetic adsorption device 4 of each roundness coincidence device 3 together form a circular ring coaxial with the first connecting steel pipe 1 .

[0053] Step three: control the top pressure regulating column 6 to continue to adjust in the same direction and equidistantly along its own axial direction relative to the connecting arm 7 until each arc plate 12 presses on the circumference of the second connecting steel pipe 2 at the same time; that is, rotate the rotating rod 15 connected to the upper end of each of the top pressure regulating columns 6 in the forward direction to make the top pressure regulating column 6 reversely adjusted relative to the connecting arm 7, so that the lower contour surface of the arc plate 12 on the arc plate 12 is fitted together with the circumference of the second connecting steel pipe 2, and the rotating rod 5 at the upper end of each top pressure regulating column 6 rotates the same number of times; thereby ensuring that the axis of the second connecting steel pipe 2 and the axis of the first connecting steel pipe 1 are in the same straight line under the joint action of each arc plate 12, each magnetic adsorption device 4 and each arc connecting bracket 14.

[0054] Step 4: Under the condition of step 3, weld the overlapping parts of the circumference of the first connecting steel pipe 1 and the circumference of the second connecting steel pipe 2; although there is a difference in the roundness of the first connecting steel pipe 1 and the second connecting steel pipe 2, when the first connecting steel pipe 1 and the second connecting steel pipe 2 are coaxial, most of the circumferences of the first connecting steel pipe 1 and the second connecting steel pipe 2 overlap together; after welding these overlapping areas, the second connecting steel pipe 2 is equivalent to a coaxial fixed connection to one side of the first connecting steel pipe 1.

[0055] Step 5: After completing step 4, first remove each arc-shaped connecting bracket 14 from each roundness coincidence device 3, and then remove each roundness coincidence device 3 from the first connecting steel pipe 1; since most areas of the circumference of the first connecting steel pipe 1 and the circumference of the second connecting steel pipe 2 have been welded together in step 4, after removing each arc-shaped connecting bracket 14 and each roundness coincidence device 3, the first connecting steel pipe 1 and the second connecting steel pipe 2 will not be separated;

[0056] Step 6: Adsorb a roundness coincidence device 3 on the circumference of the first connecting steel pipe 1 close to the second connecting steel pipe 2, and make the lower end of the top pressure regulating column 6 be located above a protrusion 16 on the circumference of the second connecting steel pipe 2;

[0057] Step 7: In the state of step 6, the top pressure regulating column 6 is controlled to continue to be adjusted along its own axial direction relative to the connecting arm 7, so that the lower end of the top pressure regulating column 6 presses down the tube wall where the protrusion 16 on the second connecting steel pipe 2 is located until it overlaps with the tube wall of the first connecting steel pipe 1, and the arc plate 12 moves along the axial direction of the top pressure regulating column 6 to the upper end of the B thread 6b; at this time, the arc plate 12 is located in the upper half of the top pressure regulating column 6, so it will not affect the subsequent welding;

[0058] Step 8: In the state of step 7, a protrusion 16 on the circumference of the second connecting steel pipe 2 is welded to the first connecting steel pipe 1, and then the roundness coincidence device 3 is transferred to the lower end of the top pressure adjustment column 6 and is located above the next protrusion 16 on the circumference of the second connecting steel pipe 2, and the magnetic adsorption device 4 is adsorbed on the circumference of the first connecting steel pipe 1 close to the second connecting steel pipe 2;

[0059] Step nine: Repeat steps seven to eight until the second connecting steel pipe 2 is welded to the first connecting steel pipe 1; then check the connection between the first connecting steel pipe 1 and the second connecting steel pipe 2. If there is no protrusion 16 on the circumferential surface of the first connecting steel pipe 1 that protrudes beyond the circumferential surface of the second connecting steel pipe 2, it means that the welding work has been completed; if there is a protrusion 16 on the circumferential surface of the first connecting steel pipe 1 that protrudes beyond the circumferential surface of the second connecting steel pipe 2, subsequent steps ten to thirteen are required.

[0060] Step 10: In the state of step 9, the magnetic adsorption device 4 is adsorbed on the circumference of the second connecting steel pipe 2 close to the first connecting steel pipe 1, and the lower end of the top pressure adjustment column 6 is located above a protrusion 16 on the circumference of the first connecting steel pipe 1;

[0061] Step 11: In the state of step 10, the top pressure regulating column 6 is controlled to continue to be adjusted forwardly along its own axial direction relative to the connecting arm 7, so that the lower end of the top pressure regulating column 6 presses down the tube wall where the protrusion 16 on the first connecting steel tube 1 is located until it overlaps with the tube wall of the second connecting steel tube 2; at this time, the arc plate 12 is located in the upper half of the top pressure regulating column 6, so it will not affect the subsequent welding;

[0062] Step 12: In the state of step 11, a protrusion 16 on the circumference of the first connecting steel pipe 1 is welded to the second connecting steel pipe 2, and then the roundness coincidence device 3 is transferred to the lower end of the top pressure adjustment column 6 and is located above the next protrusion 16 on the circumference of the first connecting steel pipe 1, and the magnetic adsorption device 4 is adsorbed on the circumference of the second connecting steel pipe 2 close to the first connecting steel pipe 1;

[0063] Step 13: Repeat steps 10 to 12 until the protrusions 16 on the circumferential surface of the first connecting steel pipe 1 are completely welded to the second connecting steel pipe 2, thereby completing the welding process.

[0064] The above are preferred embodiments of the present invention. It should be pointed out that a person skilled in the art may make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A roundness coincidence device for welding a circular tubular steel structure, characterized in that: The invention comprises a first connecting steel pipe (1) and a second connecting steel pipe (2), wherein the second connecting steel pipe (2) is coaxially spliced ​​at one end of the first connecting steel pipe (1), and further comprises a roundness coincidence device (3); the roundness coincidence device (3) comprises a magnetic adsorption device (4) and a top pressure adjustment column (6), wherein the top pressure adjustment column (6) is connected to one side of the magnetic adsorption device (4) via a connecting arm (7), and the top pressure adjustment column (6) is vertically connected to the connecting arm (7); when the magnetic adsorption device (4) is adsorbed on the circumferential surface of the first connecting steel pipe (1) close to the second connecting steel pipe (2), the axis of the top pressure adjustment column (6) extends along the radial direction of the second connecting steel pipe (2); the top pressure adjustment column (6) can be adjusted along its own axial direction relative to the connecting arm (7), so that the end of the top pressure adjustment column (6) can be pressed onto the circumferential surface of the second connecting steel pipe (2) close to the first connecting steel pipe (1).

2. The roundness coincidence device for welding a circular tubular steel structure according to claim 1, characterized in that: One end of the connecting arm (7) is connected to the upper end of the magnetic adsorption device (4), and the other end is fixedly connected to an A nut (8) that matches the top pressure adjustment column (6); when the lower end of the top pressure adjustment column (6) is pressed against the circumference of the second connecting steel pipe (2) close to the first connecting steel pipe (1), the radial adjustment of the top pressure adjustment column (6) relative to the A nut (8) can press the circumference of the second connecting steel pipe (2) down to overlap with the circumference of the first connecting steel pipe (1).

3. The roundness coincidence device for welding a circular tubular steel structure according to claim 2, characterized in that: The top pressure adjustment column (6) is a threaded column, and an A thread (6a) is provided on the top pressure adjustment column (6). The top pressure adjustment column is threadedly matched with an A nut (8) on the connecting arm (7) through the A thread (6a); when the lower end of the top pressure adjustment column (6) is pressed against the circumferential surface of the second connecting steel pipe (2) close to the first connecting steel pipe (1), the threaded match between the A nut (8) and the A thread (6a) can prevent the top pressure adjustment column (6) from moving in a direction close to the connecting arm (7) under the action of the second connecting steel pipe (2).

4. The roundness coincidence device for welding a circular tubular steel structure according to claim 3, characterized in that: The section of the top pressure regulating column (6) provided with the A thread (6a) is the first section of the threaded column, the lower end of the first section of the threaded column is integrally connected with the second section of the threaded column, the second section of the threaded column is provided with the B thread (6b), the pitch of the B thread (6b) is greater than the pitch of the A thread (6a); it also includes an arc plate (12), the arc plate (12) is provided with a B nut (13) matched with the B thread (6b) on the top pressure regulating column (6), the B nut (13) is threadedly matched on the second section of the threaded column; the top pressure regulating column (6) is adjusted along its own axial direction relative to the connecting arm (7), so that the lower arc surface of the arc plate (12) is attached to and pressed against the circumferential surface of the second connecting steel pipe (2), and the relative movement speed between the top pressure regulating column (6) and the A nut (8) is slower than the relative movement speed between the arc plate (12) and the top pressure regulating column (6).

5. The roundness coincidence device for welding a circular tubular steel structure according to claim 4, characterized in that: A guide rod (11) is provided on the side of the arc plate (12) away from the B nut (13), and a guide hole (10) is provided on the end of the connecting arm (7) away from the magnetic adsorption device (4), and the guide rod (11) is slidably fitted in the guide hole (10); when the B nut (13) on the arc plate (12) is threadedly fitted with the B thread (6b) at the lower end of the top pressure adjustment column (6), the sliding fit between the guide rod (11) and the guide hole (10) guides the relative movement between the arc plate (12) and the top pressure adjustment column (6).

6. The roundness coincidence device for welding a circular tubular steel structure according to claim 4, characterized in that: A plurality of roundness coincidence devices (3) are arranged in a circular array and adsorbed on the first connecting steel pipe (1) at the same time. Two adjacent roundness coincidence devices (3) are connected via a detachable arc-shaped connecting bracket (14). Each of the top pressure regulating columns (6) is adjusted in the same direction and at equal distances along its own axial direction, so that the lower arc surfaces of the arc-shaped plates (12) connected to each of the top pressure regulating columns (6) are simultaneously attached to and pressed against the circumferential surface of the second connecting steel pipe (2). At this time, each of the magnetic adsorption devices (4) and the first The circle formed by the connecting lines between the contact points on the circumference of a connecting steel pipe (1) is concentric with the circle formed by the connecting lines between the lower arc surfaces of each arc plate (12). Therefore, when the lower arc surfaces of each arc plate (12) connected to each top pressure regulating column (6) are simultaneously attached to the circumference of the second connecting steel pipe (2), the cooperation of each magnetic adsorption device (4), each arc plate (12) and each arc connecting bracket (14) can ensure that the axis of the first connecting steel pipe (1) and the axis of the second connecting steel pipe (2) are located on the same straight line.

7. The working method of the roundness coincidence device for circular tubular steel structure welding according to claim 3 is characterized in that: Step 1: placing the first connecting steel pipe (1) and the second connecting steel pipe (2) on a working platform, splicing them coaxially, and installing the magnetic adsorption device (4) on the circumference of the first connecting steel pipe (1) close to the second connecting steel pipe (2); Step 2: Control the top pressure regulating column (6) to continue to adjust along its own axial direction relative to the connecting arm (7) until the lower end of the top pressure regulating column (6) contacts the circumference of the second connecting steel pipe (2), and weld the overlapping areas of the circumference of the first connecting steel pipe (1) and the circumference of the second connecting steel pipe (2) in sequence along the circumference of the joint; the position of the magnetic adsorption device (4) adsorbed on the first connecting pipe (1) changes as the welding process proceeds; Step 3: When the lower end of the top pressure regulating column (6) contacts the position of the protrusion (16) on the circumference of the second connecting steel pipe (2), the top pressure regulating column (6) is controlled to continue to be adjusted along its own axial direction relative to the connecting arm (7), so that the lower end of the top pressure regulating column (6) presses the circumference of the position of the protrusion (16) on the second connecting steel pipe (2) downward until it overlaps with the circumference of the first connecting steel pipe (1); Step 4: In the state of step 3, welding is performed on the area where the circumference of the first connecting steel pipe (1) and the circumference of the second connecting steel pipe (2) overlap; Step 5: Repeat steps 2 to 4 until a section of the second connecting steel pipe (2) close to the first connecting steel pipe (1) is completely welded to the first connecting steel pipe (1).

8. The working method of the roundness coincidence device for circular tubular steel structure welding according to claim 6, characterized in that: Step 1: placing the first connecting steel pipe (1) and the second connecting steel pipe (2) on a working platform and splicing them coaxially, and adsorbing and installing a plurality of roundness coincidence devices (3) connected with arc plates (12) on the circumference of the first connecting steel pipe (1) close to the second connecting steel pipe (2); Step 2: connecting an arc-shaped connecting bracket (14) between two adjacent roundness coincidence devices (3); Step 3: Control the top pressure adjustment column (6) to continue to adjust along its own axial direction in the same direction and at equal distances relative to the connecting arm (7) until each arc plate (12) presses against the circumferential surface of the second connecting steel pipe (2); Step 4: In the state of step 3, welding the overlapping portion of the circumference of the first connecting steel pipe (1) and the circumference of the second connecting steel pipe (2); Step 5: After completing step 4, first remove each arc-shaped connecting bracket (14) from each roundness overlap device (3), and then remove each roundness overlap device (3) from the first connecting steel pipe (1); Step 6: adsorb a roundness coincidence device (3) on the circumference of the first connecting steel pipe (1) close to the second connecting steel pipe (2), and make the lower end of the top pressure regulating column (6) be located above a protrusion (16) on the circumference of the second connecting steel pipe (2); Step 7: In the state of step 6, the top pressure regulating column (6) is controlled to continue to be adjusted along its own axial direction relative to the connecting arm (7), so that the lower end of the top pressure regulating column (6) presses down the tube wall where the protrusion (16) on the second connecting steel tube (2) is located until it overlaps with the tube wall of the first connecting steel tube (1), and the arc plate (12) moves along the axial direction of the top pressure regulating column (6) to the upper end of the B thread (6b); Step 8: In the state of step 7, after welding a protrusion (16) on the circumferential surface of the second connecting steel pipe (2) to the first connecting steel pipe (1), the roundness coincidence device (3) is then transferred to the lower end of the top pressure adjustment column (6) so as to be located above the next protrusion (16) on the circumferential surface of the second connecting steel pipe (2), and the magnetic adsorption device (4) is adsorbed on the circumferential surface of the first connecting steel pipe (1) close to the second connecting steel pipe (2); Step 9: Repeat steps 7 to 8 until the second connecting steel pipe (2) is welded to the first connecting steel pipe (1).

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