Metal pipe inner seam welding machine

Abstract

The invention relates to the technical field of inner seam welding machines, in particular to a metal pipe inner seam welding machine which is characterized in that a lifting table of a lifting device is rotationally connected with a rotating seat assembly; the lifting table is connected with a motor assembly for driving the rotating seat assembly to rotate; the weldment positioning assembly is arranged under the rotating seat assembly; a lower pressing shaft in sliding connection with the bottom rack is fixed to the bottom of the material carrying table. The outer positioning swing assemblies are circumferentially distributed on the outer side of the material carrying table. The turntable is in sliding connection with the lower pressing shaft; a lower sliding ring sleeved outside the lower pressing shaft is fixed on the turntable; a second plunger abutting against the surface of the wedge block is fixed to the lower sliding ring. The rotating disc rotates to drive the outer positioning swing assembly to rotate. A torsional spring is connected between the lower sliding ring and the bottom rack; the bottom of the rotating base assembly is rotationally connected with a pressing plate. According to the invention, the feeding and welding efficiency of the welding machine can be improved, the welding quality is improved, and the equipment cost is reduced by reducing a power device and simplifying the circuit structure.

Description

Technical Field

[0001] The invention relates to the technical field of inner seam welding machines, in particular to an inner seam welding machine for metal pipes. Background Art

[0002] The internal seam welding of metal pipes mainly includes longitudinal seam welding and internal girth welding. When sealing one end of a metal pipe, such as reactors, sealed tanks, metal cans, metal barrels and other products, it is generally completed by internal girth welding; the welding process is: the metal pipe and the matching metal plugging plate are placed in their respective positioning fixtures for positioning and pressing, so as to pre-weld at the outer connection, and the metal pipe and the metal plugging plate are connected and fixed by welding 3-5 points, and then the initially finalized product is transferred to the internal girth welding equipment for positioning, and the welding head of the internal girth welding machine is directly inserted into the inner cavity of the pipe for welding, and the rotating device of the internal girth welding machine drives the welding head to rotate one circle to complete the annular welding of the product connection gap.

[0003] Although the existing welding equipment has a simple structure, it has the following disadvantages: 1. Before each inner ring seam welding, it is necessary to pre-weld and fix it, and then transfer it to the inner ring seam welding machine for welding. Both pre-welding and inner ring seam welding require positioning of the welded parts. This welding method has low feeding and welding efficiency. 2. When the welding head rotates during the circular welding, it is prone to jitter and deviation during the circular rotation due to the lack of support due to the suspension of the welding head, which affects the welding quality. 3. The lifting and lowering of the welding head and the clamping of the weldment of the inner ring seam welding equipment require separate power equipment, which makes the circuit of the control system more complicated, increases the difficulty of debugging, and also increases the cost of the power equipment. Summary of the invention

[0004] Aiming at the defects and shortcomings of the prior art, the present invention provides a metal pipe inner seam welding machine.

[0005] The metal pipe inner seam welding machine described in the present invention comprises a lifting device and a weldment positioning assembly; a rotating seat assembly is rotatably connected to the lifting platform of the lifting device; a welding machine assembly is arranged on the rotating seat assembly; a motor assembly for driving the rotating seat assembly to rotate is connected to the lifting platform; the weldment positioning assembly is arranged directly below the rotating seat assembly; The weldment positioning assembly includes a bottom frame, a loading platform and a turntable rotatably connected to the bottom frame; a lower pressure shaft slidably connected to the bottom frame is fixed to the bottom of the loading platform; at least three external positioning swing assemblies are arranged on the bottom frame; the external positioning swing assemblies are circumferentially distributed on the outside of the loading platform; the turntable is slidably connected to the lower pressure shaft; at least one wedge block is arranged on the shaft body of the lower pressure shaft; a lower sliding ring is fixed on the turntable, and the lower sliding ring is sleeved outside the lower pressure shaft; a second plunger is fixed on the lower sliding ring, which is tightly pressed against the surface of the wedge block; after the turntable rotates, the external positioning swing assembly is driven to rotate; a torsion spring is connected between the lower sliding ring and the bottom frame; and a pressure plate is rotatably connected to the bottom of the rotating seat assembly.

[0006] Further, the external positioning swing assembly includes a swing frame, an upper rotating shaft, a sliding outer cylinder and a lower rotating shaft; the upper rotating shaft and the lower rotating shaft are both fixed on the sliding outer cylinder; the lower rotating shaft is rotatably connected to the bottom frame; The interior of the sliding outer cylinder is slidably connected with an inner sliding rod; the inner sliding rod is rotatably connected to the eccentric position of the turntable; and a blocking plate positioning module for positioning the metal blocking plate is provided on the swing frame.

[0007] Furthermore, the turntable is evenly distributed with a plurality of socket groups; the number of the socket groups is equal to the number of the external positioning swing assemblies; the socket groups are composed of a plurality of pivot insertion holes; the pivot insertion holes of the same socket group are arranged in sequence along the radial direction of the turntable; a sleeve is fixed to the end of the inner slide rod; a pivot is inserted inside the sleeve; the diameter of the pivot, the inner hole diameter of the sleeve, and the diameter of the pivot insertion hole are equal; an upper limit plate is fixed to one end of the pivot; the other end of the pivot passes through the sleeve from top to bottom and is inserted into one of the pivot insertion holes of the socket group; the diameter of the upper limit plate is larger than the inner hole diameter of the sleeve; the upper limit plate is a magnet; a handle is fixed to the top of the upper limit plate.

[0008] Furthermore, a plurality of straight rods are fixed on the turntable; the straight rods are arranged along the circumferential direction of the turntable; and the number of the straight rods is equal to the number of the socket groups.

[0009] Furthermore, a second roller is arranged on the swing frame; the blocking plate positioning module includes a first bolt, a first spring, a side pressure block and a fixing seat fixed on the swing frame; a slot hole, a first threaded hole matching the first bolt and a guide groove slidably connected to the side pressure block are respectively arranged on the fixing seat; the first threaded hole and the guide groove are both connected to the slot hole; one end of the side pressure block passes through the guide groove and extends to the outside of the fixing seat; the other end of the side pressure block extends into the slot hole; a second retaining ring is arranged at one end of the side pressure block extending into the slot hole; a round shaft is fixed on the second retaining ring; the first The bolt is threadedly connected to the first threaded hole; the first bolt extends into the slotted hole and is provided with a first retaining ring at one end; the two ends of the first spring are respectively sleeved on the first bolt and the round shaft; the two ends of the first spring are respectively pressed against the second retaining ring and the first retaining ring; the end of the side pressure block extending out of the fixed seat is provided with a positioning inclined surface; the positioning inclined surface is provided between the top surface of the side pressure block and the side surface of the side pressure block; a vertical positioning surface is provided between the bottom surface of the side pressure block and the positioning inclined surface; a groove hole is provided at the bottom of the pressure plate; a laser locator is fixed inside the groove hole.

[0010] Furthermore, the welding machine assembly includes a welding machine body, a cylinder and a horizontal swing arm; one end of the horizontal swing arm is hinged on the outer side wall of the rotating seat assembly, and the other end is fixed to the welding machine body; one end of the cylinder is hinged on the outer side wall of the rotating seat assembly, and the other end is hinged on the rod body of the horizontal swing arm; the horizontal swing arm is in an arc shape.

[0011] Furthermore, the rotating seat assembly includes a connecting cover, a rotating drum, and a sliding shaft slidably connected to the inside of the rotating drum; a plurality of connecting plates are fixed between the connecting cover and the top of the rotating drum; a sliding shaft limiting plate is fixed to one end of the sliding shaft, and the other end passes through the inner hole of the rotating drum from top to bottom and is fixed to the pressing plate; A cavity is provided on the bottom end surface of the rotating drum; an upper limit ring and a lower limit ring are fixed on the sliding shaft; a plurality of through holes connected to the cavity are opened on the side wall of the rotating drum; the through holes are distributed in a circle on the rotating drum; a plurality of the through holes are connected to an inner positioning rod assembly; the inner positioning rod assembly includes a first rocker rod rotatably connected in the through hole; one end of the first rocker rod extends between the upper limit ring and the lower limit ring; a roller bracket is provided on the other end of the first rocker rod; a first roller is rotatably connected to the roller bracket; the connecting cover is connected to the motor assembly.

[0012] Further, a plurality of positioning holes are arranged on the side wall of the sliding shaft; the positioning holes are arranged along the circumferential direction of the sliding shaft; a lower sliding sleeve is fixed on the lower limiting ring; a second threaded hole is arranged on the lower sliding sleeve; a second bolt is threadedly connected to the second threaded hole; the diameter of the second bolt is equal to the diameter of the positioning hole; the end of the second bolt is inserted into one of the positioning holes; a straight slot hole connected to the cavity is opened on the side wall of the rotating drum; A notch is provided at the end of the first swing rod; the roller bracket is rotatably connected to the notch; a second spring is connected between the inner bottom wall of the notch and the roller bracket; a first plunger is fixed to the first swing rod on the side facing the lower limit ring.

[0013] The beneficial effects of the present invention are: 1. When using the present invention, after placing the metal pipe and the metal plugging plate on the loading platform, the metal plugging plate is pressed down by the rotating seat assembly. The action of positioning the welding machine assembly on the metal plugging plate can drive the external positioning swing assembly to automatically align the axes of the metal plugging plate, the pipe, the rotating seat assembly and the loading platform. There is no need for pre-welding and multiple positioning, which improves the efficiency of loading and welding.

[0014] 2. In the present invention, the bottom of the rotating seat assembly connected to the welding machine assembly is directly pressed on the metal plugging plate; the metal plugging plate is pressed up and down and the two ends of the rotating seat assembly are pressed, which enhances the anti-bending effect of the rotating seat assembly, and the rotating seat assembly rotates more stably on the metal plugging plate, thereby improving the welding quality.

[0015] 3. When using the present invention, a single motor assembly is used as a power source for lifting the lifting device, rotating the rotating seat assembly, lifting the welding machine assembly, and positioning and clamping the pipe and metal plug, thereby reducing the setting of the power device, simplifying the circuit structure, and reducing the equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural diagram after the weldment positioning assembly is disassembled in the present invention; Figure 3 It is a structural diagram of the lifting device, the rotating seat assembly connection and the welding machine assembly connection; Figure 4 is a cross-sectional view of the rotating seat assembly; Figure 5 yes Figure 4 A magnified view of section A; Figure 6 is a structural diagram of the inner positioning rod assembly; Figure 7 It is a first-person perspective stereogram of the weldment positioning assembly; Figure 8It is a second-view stereogram of the weldment positioning assembly; Fig. 9 It is a structural diagram of the connection between the turntable, the loading platform and a single external positioning swing component; Fig.10 It is a structural diagram of the connection between the turntable and the loading platform; Fig.11 It is a second-view stereogram of the weldment positioning assembly; Fig.12 It is a structural diagram of the external positioning swing assembly; Fig.13 It is the structural diagram of the blocking plate positioning module; Description of reference numerals: 1. Lifting device; 101. Lifting platform; 2. Rotating seat assembly; 201. Connecting cover; 202, connecting plate; 203, sliding shaft limiting plate; 204, rotating drum; 204a, cavity; 204b, through hole; 204c, straight slot hole; 205, sliding shaft; 205a, pressing plate; 205b, positioning hole; 205c, upper limit ring; 205d, laser locator; 205e, turntable bearing; 3. Inner positioning rod assembly; 301. First plunger; 302. First swing rod; 303, roller bracket; 303a, first roller; 304, second spring; 4. Welding machine assembly; 401. Welding machine body; 402. Cylinder; 403. Horizontal swing arm; 5. External positioning swing assembly; 501. Blocking plate positioning module; 501a. Fixed seat; 501a1. Slot; 501a2, first threaded hole; 501a3, guide groove; 501b, first bolt; 501b1, first retaining ring; 501c, first spring; 501d, side pressure block; 501d1, second retaining ring; 501d2, round shaft; 501d3, positioning inclined plane; 501d4, vertical positioning plane; 502, second roller; 503, swing frame; 504, upper rotating shaft; 505, sliding outer cylinder; 506, lower rotating shaft; 507, inner sliding rod; 508, pivot; 509, sleeve; 5010, upper limit plate; 5011, handle; 6, turntable; 601, straight rod; 601a, pivot insertion hole; 602, lower sliding ring; 603, first fixing plate; 7, bottom frame; 701, bottom sliding sleeve; 702, second fixing plate; 703, bottom plate; 8, motor assembly; 9, torsion spring; 10. Lower limit ring; 1001. Lower sliding sleeve; 1001a. Second threaded hole; 11. Second bolt; 12. Loading platform; 1201. Avoidance groove; 13. Lower pressing shaft; 1301. Wedge block; 1302. Guide block; 14. Second plunger. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] like Figures 1 to 13 As shown, a metal pipe inner seam welding machine described in the present invention includes a lifting device 1 and a weldment positioning assembly; a rotating seat assembly 2 is rotatably connected to the lifting platform 101 of the lifting device 1; a welding machine assembly 4 is arranged on the rotating seat assembly 2; a motor assembly 8 for driving the rotating seat assembly 2 to rotate is connected to the lifting platform 101; the weldment positioning assembly is arranged directly below the rotating seat assembly 2; the motor assembly 8 is composed of a motor and a reduction box; one end of the motor is fixed on the lifting platform 101, and the other end of the motor is fixed to the input of the reduction box. end; the output end of the reduction gearbox is connected to the rotating seat assembly 2; the lifting device 1 is essentially the same as the prior art, so it is not described in detail. The lifting device 1 is composed of a column and a lifting linear module that can drive the lifting platform 101 to do lifting movement; the lifting device 1 can drive the lifting platform 101, the rotating seat assembly 2, the motor assembly 8 and the welding machine assembly 4 to do lifting movement together; the weldment positioning assembly includes a bottom frame 7, a loading platform 12 and a turntable 6 rotatably connected to the bottom frame 7; the bottom of the loading platform 12 is fixed with a sliding connection with the bottom frame 7 The lower pressing shaft 13; at least three external positioning swinging components 5 are arranged on the bottom frame 7; the external positioning swinging components 5 are circumferentially distributed on the outer side of the loading platform 12; the turntable 6 is slidably connected with the lower pressing shaft 13; at least one wedge block 1301 is arranged on the shaft body of the lower pressing shaft 13; a lower sliding ring 602 sleeved outside the lower pressing shaft 13 is fixed on the turntable 6; a second plunger 14 pressed against the surface of the wedge block 1301 is fixed on the lower sliding ring 602; the turntable 6 drives the external positioning swinging components 5 to rotate after the rotation ; A torsion spring 9 is connected between the lower sliding ring 602 and the bottom frame 7; the second plunger 14 is essentially the same as the prior art and is therefore not described in detail. The small ball on the top of the second plunger 14 is pressed against the surface of the wedge block 1301; the elastic force generated by the torsion spring 9 makes the lower sliding ring 602 tend to rotate, which can ensure that the ball of the second plunger 14 is always pressed against the surface of the wedge block 1301; the lower pressure shaft 13 directly passes through the turntable 6 and forms a rotational connection with the turntable 6; the turntable 6 and the lower sliding ring 602 are fixed as a whole by a plurality of first fixing plates 603.

[0019] A bottom plate 703 is provided at the bottom of the bottom frame 7; the bottom plate 703 is fixed to the bottom frame 7 by a second fixing plate 702; a bottom sliding sleeve 701 is fixed on the bottom plate 703; a guide block 1302 is provided on the side wall of the lower pressing shaft 13; a guide straight groove matching the guide block 1302 is provided inside the bottom sliding sleeve 701; the guide block 1302 is inserted into the guide straight groove, so that the lower pressing shaft 13 can only perform lifting movement but cannot rotate; first place the metal plugging plate to be welded on the surface of the loading platform 12, and then stand the pipe on the surface of the metal plugging plate; then the lifting device 1 drives the rotating seat assembly 2 to descend, so that the bottom end of the rotating seat assembly 2 and the welding machine assembly 4 are inserted into the inner cavity of the pipe together; The bottom of the rotating seat assembly 2 is rotatably connected with a pressure plate 205a. During the insertion process, the pressure plate 205a of the rotating seat assembly 2 first directly contacts the metal plugging plate. During the continuous descent of the rotating seat assembly 2, the loading platform 12, the lower pressure shaft 13, the pipe and the metal plugging plate move downward together; the wedge block 1301 squeezes the second plunger 14, so that the turntable 6 and the lower sliding ring 602 rotate relative to the bottom frame 7; after the turntable 6 rotates, it drives all the external positioning swing assemblies 5 to rotate synchronously, and the external positioning swing assemblies 5 are simultaneously pressed on the outer wall of the pipe and the side wall of the metal plugging plate. The external positioning swing assembly 5 synchronously positions and centers the pipe and the metal plugging plate, so that the pipe and the metal plugging plate are coaxially arranged on the loading platform 12.

[0020] As a preferred embodiment of the present invention, the external positioning swing assembly 5 includes a swing frame 503, an upper rotating shaft 504, a sliding outer cylinder 505 and a lower rotating shaft 506; the upper rotating shaft 504 and the lower rotating shaft 506 are both fixed on the sliding outer cylinder 505; the lower rotating shaft 506 is rotatably connected to the bottom frame 7; The inner sliding rod 507 is slidably connected to the inner part of the sliding outer cylinder 505; the inner sliding rod 507 is rotatably connected to the eccentric position of the rotating disk 6; the swing frame 503 is provided with a blocking plate positioning module 501 for positioning the metal blocking plate; the inner sliding rod 507 matches the inner hole of the sliding outer cylinder 505; the sliding outer cylinder 505 is constrained by the lower rotating shaft 506 and can only rotate around the lower rotating shaft 506; After the turntable 6 rotates, it drives the inner slide bar 507 to move. Since one end of the inner slide bar 507 is rotatably connected to the turntable 6, the inner slide bar 507 makes a circular motion around the axis of the turntable 6 at the connection position with the turntable 6; and since the inner slide bar 507 can only make a linear motion in the sliding outer cylinder 505, while the inner slide bar 507 is driven to rotate by the turntable 6, the inner slide bar 507 will slide in the sliding outer cylinder 505, and the swinging energy of the inner slide bar 507 can drive the upper rotating shaft 504 and the swing frame 503 to rotate; in this way, a single turntable 6 can drive multiple swing frames 503 to rotate synchronously, so as to realize the centering of the metal plugging plate and the pipe on the loading platform 12, and use multiple plugging plate positioning modules 501 to simultaneously press against the circumferential surface of the metal plugging plate to position the metal plugging plate.

[0021] Since the axial position of the lower rotating shaft 506 is unchanged relative to the bottom frame 7, and the distance between the connection point between the inner sliding rod 507 and the turntable 6 and the axial center of the lower rotating shaft 506 is constantly changing during the rotation of the turntable 6, it is necessary to utilize the telescopic structure formed by the sliding connection between the inner sliding rod 507 and the sliding outer cylinder 505 to adapt to the change in the distance between the aforementioned connection point and the axial center of the lower rotating shaft 506; adopting this planar swinging method, the swing frame 503 can have a larger swing amplitude after the turntable 6 rotates a small amplitude, thereby reducing the sliding stroke of the lower pressure shaft 13 and improving the clamping efficiency.

[0022] As a preferred embodiment of the present invention, a plurality of jack groups are evenly distributed on the turntable 6; the number of the jack groups is equal to the number of the external positioning swing components 5; the jack groups are composed of a plurality of pivot insertion holes 601a; the pivot insertion holes 601a of the same jack group are arranged in sequence along the radial direction of the turntable 6; a sleeve 509 is fixed to the end of the inner slide bar 507; a pivot 508 is inserted into the interior of the sleeve 509; the diameter of the pivot 508, the inner hole diameter of the sleeve 509, and the diameter of the pivot insertion hole 601a are equal; an upper limit plate 5010 is fixed to one end of the pivot 508; the other end of the pivot 508 passes through the sleeve 509 from top to bottom and is inserted into one of the pivot insertion holes 601a of the jack group; the diameter of the upper limit plate 5010 is larger than the inner hole diameter of the sleeve 509; the upper limit plate 5010 is a magnet; a handle 5011 is fixed to the top of the upper limit plate 5010; The pivot 508 is a round shaft with a smooth and wear-resistant surface, so that the pivot 508 can slide smoothly in the sleeve 509 and the pivot insertion hole 601a; a plurality of jack groups form a coaxially arranged hole group on the rotating disk 6; When designing the position of the pivot insertion hole 601a on the turntable 6, pipes of different specifications are placed on the loading platform 12 so that the pipes are coaxial with the lower pressing shaft 13, and then the loading platform 12 is pressed down to position so that the blocking plate positioning module 501 is aligned with the metal blocking plate, and then each swing frame 503 is closely attached to the outer surface of the pipe, and then the corresponding pivot insertion hole 601a is opened at the position of the sleeve 509 facing the turntable 6; When the diameter of the pipe is different, the position of the sleeve 509 facing the turntable 6 is different, and these positions will be arranged along the radial direction of the turntable 6; the corresponding specification metal plugging plate is marked with a numerical value on the corresponding pivot insertion hole 601a. ​​After the above settings, according to the processing requirements of different pipe diameters, the pivot 508 can be pulled out from the original pivot insertion hole 601a and inserted into another pivot insertion hole 601a of the jack group, and the distance from the pivot 508 to the axis of the turntable 6 can be changed to adjust the swing amplitude of the pivot 508 to match the clamping and positioning of pipes of different diameters; the pivot 508 adopts a plug-in connection, relying on its own gravity and the magnetic adsorption force to connect to the surface of the turntable 6, so that the pivot 508 is not easy to loosen from the pivot insertion hole 601a.

[0023] As a preferred embodiment of the present invention, a plurality of straight rods 601 are fixed on the turntable 6, and the straight rods 601 are arranged along the circumferential direction of the turntable 6; the number of the straight rods 601 is equal to the number of the socket groups; when the straight rods 601 are set, the same socket group is set on the same straight rod 601 while meeting the stiffness requirements of the straight rods 601; the various pivot insertion holes 601a on the same socket group are processed on a straight rod 601 to reduce the difficulty of processing and positioning the pivot insertion holes 601a.

[0024] As a preferred embodiment of the present invention, a second roller 502 is provided on the swing frame 503; the second roller 502 is used as a positioning member pressed against the surface of the pipe, and any position of the surface of the second roller 502 can be tangent to the outer surface of the pipe, and the distance from the axis of the upper rotating shaft 504 to the axis of the second roller 502 is always constant, which can ensure the positioning accuracy of the second roller 502; a plurality of avoidance grooves 1201 are provided on the side wall of the loading platform 12, which are used for the side pressure block 501d to extend into the space when positioning the metal plugging plate; the plugging plate positioning module 501 includes a first bolt 501b, a first spring 501c, a side pressure block 501d and a first spring 501c fixed to the swing frame 5 03 on the fixing seat 501a; the fixing seat 501a is respectively provided with a slot hole 501a1, a first threaded hole 501a2 matching the first bolt 501b and a guide groove 501a3 slidably connected to the side pressure block 501d; the first threaded hole 501a2 and the guide groove 501a3 are both connected to the slot hole 501a1; one end of the side pressure block 501d passes through the guide groove 501a3 and extends to the outside of the fixing seat 501a; the other end of the side pressure block 501d extends into the slot hole 501a1; the end of the side pressure block 501d extending into the slot hole 501a1 is provided with a second retaining ring 501d1; A round shaft 501d2 is fixed on the second retaining ring 501d1; the first bolt 501b is threadedly connected to the first threaded hole 501a2; the first bolt 501b is inserted into the slotted hole 501a1 and is provided with a first retaining ring 501b1 at one end; the two ends of the first spring 501c are respectively sleeved on the first bolt 501b and the round shaft 501d2; the two ends of the first spring 501c are respectively pressed against the second retaining ring 501d1 and the first retaining ring 501b1; the end of the side pressure block 501d extending out of the fixed seat 501a is provided with a positioning inclined surface 501d3; the positioning inclined surface 501d3 is provided on the side pressure block 50 1d and the side surface of the side pressure block 501d; a vertical positioning surface 501d4 is arranged between the bottom surface of the side pressure block 501d and the positioning inclined surface 501d3; a groove hole is arranged at the bottom of the pressure plate 205a; a laser locator 205d is fixed inside the groove hole; the surface of the second roller 502 is provided with a coating, which is used to reduce the friction between the pipe and the wheel body of the second roller 502 (so that the friction force of the second roller 502 on the side wall of the pipe in the vertical direction can be ignored) to ensure smooth sliding of the pipe in the vertical direction; after being clamped by the second roller 502, the pipe can still be tightly attached to the surface of the metal blocking plate due to its own gravity.

[0025] The second retaining ring 501d1 and the first retaining ring 501b1 are used to limit the first spring 501c, and the first retaining ring 501b1 is used to limit the side pressure block 501d to prevent the side pressure block 501d from loosening from the fixing seat 501a; The laser locator 205d is essentially the same as the prior art, so it will not be described in detail. The laser locator 205d can emit an annular light spot, which is coaxially arranged with the loading platform 12. The diameter of the light spot of the laser locator 205d can be adjusted according to demand. When adjusting the diameter of the light spot, the diameter of the light spot is 4 to 8 cm larger than the diameter of the metal plug required for welding. When placing the metal plug loading material, it is only necessary for the entire metal plug to fall inside the light spot. The laser locator 205d is used for the rough positioning of the metal plug loading material. The subsequent positioning of the metal plug is achieved by the side pressure block 501d, which reduces the accuracy requirements of the metal plug loading material and improves the loading efficiency.

[0026] When the pipe, the metal plugging plate and the loading platform 12 are pressed down synchronously, the pipe will first contact with the second roller 502. In this state, the length of the positioning bevel 501d3 is set according to the height of the downward pressure shaft 13 required to press down; at the last moment of positioning the pipe and the metal plugging plate, the horizontal height of the metal plugging plate will be between the second roller 502 and the side pressure block 501d, but will not contact the side pressure block 501d; therefore, the second roller 502 will first contact with the offset side of the pipe; as the loading platform 12 continues to press down, the positioning bevel 501d3 will be squeezed, and the elastic force of the first spring 501c will be overcome to compress the side pressure block 501d inward, until the circular shaft 501d2 is pressed against the first bolt 501b; therefore, the bottom edge of the metal plugging plate will first contact with the positioning bevel 501d3; When the loading platform 12 is pressed to the specified position, the vertical positioning surface 501d4 contacts the side surface of the metal plugging plate and does not contact the pipe. The vertical positioning surfaces 501d4 on the multiple external positioning swing components 5 are respectively pressed against the metal plugging plate on the loading platform 12 to achieve the center positioning of the metal plugging plate. In this structure, the swing frame 503 is fixedly connected to the plugging plate positioning module 501, and the plugging plate positioning module 501 swings together with the swing frame 503; the automatic positioning of the pipe and the metal plugging plate is achieved synchronously, thereby improving the positioning efficiency; The side pressure block 501d is pre-extended by a certain amount using the first spring 501c. When the positioning inclined surface 501d3 contacts the metal plugging plate, the positioning inclined surface 501d3 is used to pre-position the metal plugging plate. In this way, when the metal plugging plate is placed on the loading platform 12, it can be roughly positioned using a laser without precise pre-positioning. Because the metal plugging plate can be centered within a certain offset range through the guidance of the positioning inclined surface 501d3, and finally pressed by each vertical positioning surface 501d4.

[0027] When the side pressure block 501d is finally positioned, it needs to rely on the first bolt 501b to support the positioning; By rotating the first bolt 501b, the final insertion position of the side pressure block 501d can be adjusted, and the axial position of the metal plugging plate can be fine-tuned to ensure that the metal plugging plate is coaxial with the cylinder, thereby improving the welding quality of the product.

[0028] As a preferred embodiment of the present invention, the welding machine assembly 4 includes a welding machine body 401, a cylinder 402 and a horizontal swing rod 403; one end of the horizontal swing rod 403 is hinged to the outer side wall of the rotating seat assembly 2; the welding machine body 401 is fixed to the other end of the horizontal swing rod 403; one end of the cylinder 402 is hinged to the outer side wall of the rotating seat assembly 2; the other end of the cylinder 402 is hinged to the rod body of the horizontal swing rod 403; the horizontal swing rod 403 is in an arc shape; The welding machine body 401 can weld the weldment, which has no essential difference with the prior art, so it is not described in detail; the horizontal swing arm 403 can only swing horizontally on the rotating seat assembly 2; the extension and retraction of the cylinder 402 can control the swing angle of the horizontal swing arm 403, and the cylinder 402 is shortened, and the distance between the axis of the welding machine body 401 and the rotating seat assembly 2 is reduced; conversely, the cylinder 402 is extended, and the distance between the axis of the welding machine body 401 and the rotating seat assembly 2 is increased. The welding radius of the welding machine body 401 can be adjusted by the cylinder 402 to adapt to the welding of pipes of different diameters.

[0029] As a preferred embodiment of the present invention, the rotating seat assembly 2 includes a connecting cover 201, a rotating drum 204, and a sliding shaft 205 slidably connected to the inside of the rotating drum 204; a plurality of connecting plates 202 are fixed between the connecting cover 201 and the top of the rotating drum 204; a sliding shaft limiting plate 203 is fixed to one end of the sliding shaft 205; the other end of the sliding shaft 205 passes through the inner hole of the rotating drum 204 from top to bottom and is fixed to the pressing plate 205a; The bottom end surface of the rotating drum 204 is provided with a cavity 204a; an upper limit ring 205c and a lower limit ring 10 are fixed on the sliding shaft 205; a plurality of through holes 204b connected to the cavity 204a are opened on the side wall of the rotating drum 204; the through holes 204b are distributed in a circumference on the rotating drum 204; the through holes are connected with an inner positioning rod assembly 3; the inner positioning rod assembly 3 includes a first swing rod 302 rotatably connected to the through hole 204b; one end of the first swing rod 302 extends between the upper limit ring 205c and the lower limit ring 10; the other end of the first swing rod 302 is provided with a roller bracket 303; the roller bracket 303 is rotatably connected with a first roller 303a; the connecting cover 201 is connected to the motor assembly 8; A turntable bearing 205e is provided on the top surface of the pressing plate 205a at a position facing the rotating drum 204; when the rotating drum 204 is fitted on the turntable bearing 205e, the turntable bearing 205e enables the pressing plate 205a to form a rotational connection with the rotating drum 204, thereby reducing the friction between the rotating drum 204 and the pressing plate 205a when the rotating drum 204 rotates; When the pressure plate 205a on the sliding shaft 205 is not subjected to pressure, the sliding shaft 205 extends downward due to its own gravity; the upper limit ring 205c pushes the end of the first swing rod 302 that extends into the cavity 204a to move downward, so that the end of the first swing rod 302 that extends into the cavity 204a is turned upward and folded on the rotating drum 204; the sliding shaft limiting plate 203 is limited at the top of the rotating drum 204, so that the sliding shaft 205 will not be loosened from the rotating drum 204; during the descending process of the rotating drum 204, the pressure plate 205a first contacts and presses against the metal blocking plate on the loading platform 12, and then the pressure plate 205a is pushed to one side of the rotating drum 204, and the sliding shaft 205 moves relative to the rotating drum 204. The lower limit ring 10 slides upward, and the end of the first swing rod 302 extending into the cavity 204a is pushed upward, so that the end of the first swing rod 302 with the first roller 303a turns downward, and after the pressure plate 205a is attached to the bottom end surface of the rotating cylinder 204, the first swing rod 302 is fully opened, and the first roller 303a is pressed against the inner wall of the pipe; in this structure, when the external positioning swing assembly 5 is used to position the pipe, the pressure plate 205a is pressed to open the first swing rod 302, so as to realize the centering positioning of the rotating cylinder 204, which can improve the coaxiality of the rotating cylinder 204 and the pipe, and enhance the rigidity of the rotating cylinder 204, so that the welding track of the welding machine assembly 4 is more accurate; When the drum 204 descends, the first swing arm 302 opens. After the first swing arm 302 is lifted, the sliding shaft 205 descends due to its own gravity, pushing the first swing arm 302 to fold and retract; the first swing arm 302 forms a rolling connection with the inner wall of the pipe through the first roller 303a, reducing the wear of the inner wall of the pipe.

[0030] As a preferred embodiment of the present invention, a plurality of positioning holes 205b are provided on the side wall of the sliding shaft 205; the positioning holes 205b are arranged along the circumferential direction of the sliding shaft 205; a lower sliding sleeve 1001 is fixed on the lower limiting ring 10; a second threaded hole 1001a is provided on the lower sliding sleeve 1001; a second bolt 11 is threadedly connected to the second threaded hole 1001a; the diameter of the second bolt 11 is equal to the diameter of the positioning hole 205b; the end of the second bolt 11 is inserted into one of the positioning holes 205b; a straight slot hole 204c connected to the cavity 204a is provided on the side wall of the rotating cylinder 204; The end of the first swing rod 302 is provided with a notch; the roller bracket 303 is rotatably connected to the notch; a second spring 304 is connected between the inner bottom wall of the notch and the roller bracket 303; a first plunger 301 is fixed to the first swing rod 302 on the side facing the lower limit ring 10; The second bolt 11 is inserted into different positioning holes 205b, so as to adjust the height of the lower limit ring 10 on the sliding shaft 205; the higher the height of the lower limit ring 10 is, the earlier it contacts the first plunger 301 when the sliding shaft 205 slides upward, and the greater the angle at which the first swing rod 302 is pushed to flip; when the pressure plate 205a is pressed against the rotating drum 204, the flip angle of the first swing rod 302 is adjusted according to the different inner diameters of the pipe, so that the wheel body of the first roller 303a can be pressed against the inner wall of the pipe; the roller bracket 303 is hinged to the first swing rod 302, and the second spring 304 is used to automatically reset the first roller 303a after it is released, so as to prevent the roller bracket 303 from being pressed at an excessively large tilt angle and being unable to reset, thereby affecting the next positioning work of the first roller 303a; the straight slot hole 204c is used for a wrench to extend into to loosen and tighten the second bolt 11, and the second bolt 11 is a hexagon socket bolt.

[0031] The workflow of the present invention is: Initial state: the lifting device 1 resets the rotating seat assembly 2 on the lifting platform 101 so that the metal pipe can be placed between the rotating seat assembly 2 and the external positioning swing assembly 5; the welding machine body 401 of the welding machine assembly 4 is folded by the cylinder 402 so that the welding machine body 401 is close to the axis of the rotating seat assembly 2; Step 1: Loading: First, place the metal plugging plate on the surface of the loading platform 12, ensuring that the metal plugging plate as a whole is placed within the annular light spot emitted by the laser locator 205d; then pass the metal pipe through the space surrounded by the multiple second rollers 502 and place it on the metal plugging plate; Step 2: Positioning: The lifting device 1 lowers the rotating seat assembly 2 on the lifting platform 101, and the rotating seat assembly 2, the inner positioning rod assembly 3 and the welding machine assembly 4 are inserted into the inner cavity of the metal pipe; when the sliding shaft 205 and the rotating drum 204 are inserted together, the pressing plate 205a squeezes the metal blocking plate, pushing the loading platform 12 to move downward, and the sliding shaft 205 starts to move upward relative to the rotating drum 204; When the slide shaft 205 moves a certain distance, the lower limit ring 10 starts to squeeze the first plunger 301, causing the first swing rod 302 to flip outward, and the plurality of first rollers 303a are pressed against the inner side of the metal pipe, so that the slide shaft 205 stops sliding in the drum 204; the metal pipe, the slide shaft 205 and the loading platform 12 are in a coaxial state; The lifting platform 101 continues to move downward, and the pressure plate 205a continues to press the loading platform 12 downward. The lower pressure shaft 13 fixed at the bottom of the loading platform 12 is simultaneously under pressure, and the wedge block 1301 on the lower pressure shaft 13 pushes the second plunger 14, so that the turntable 6 rotates around the lower pressure shaft 13; the straight rod 601 drives one end of the inner slide rod 507 to move, so that the upper rotating shaft 504, the swing frame 503, the second roller 502 and the blocking plate positioning module 501 rotate around the bottom frame 7 together, so that the second roller 502 and the blocking plate positioning module 501 swing inward together; during the swinging process of the second roller 502 and the blocking plate positioning module 501, the metal pipe and the metal blocking plate are synchronously positioned, so that the metal pipe, the metal blocking plate, the loading platform 12 and the rotating drum 204 are coaxial, and the positioning is completed; Step 3: Welding: The cylinder 402 drives the horizontal swing rod 403 to flip the welding machine body 401 outward, the welding radius of the welding machine body 401 increases, and the motor assembly 8 drives the rotating drum 204 to rotate through the connecting cover 201, thereby driving the welding machine body 401 to rotate, and completing the annular gap welding between the metal pipe and the metal blocking plate; Step 4: Unloading: After welding is completed, the cylinder 402 drives the horizontal swing arm 403 to fold the welding machine body 401, and the lifting device 1 drives the rotating seat assembly 2 on the lifting platform 101 to rise. The pressure plate 205a removes the pressure of the metal plugging plate on the loading platform 12, and the torsion spring 9 drives the second plunger 14 to slide on the surface of the wedge block 1301. The turntable 6 rotates in the opposite direction, and the second roller 502 and the side pressure block 501d release the clamping of the metal pipe and the metal plugging plate. The rotating seat assembly 2 is retracted from the inner cavity of the metal pipe as a whole, and the welded product is taken out.

[0032] The beneficial effects of the present invention are: 1. After placing the metal pipe and metal plugging plate on the loading platform, the metal plugging plate is pressed down by the rotating seat assembly. The positioning action of the welding machine assembly on the metal plugging plate can drive the external positioning swing assembly to automatically align the axes of the metal plugging plate, pipe, rotating seat assembly and loading platform. There is no need for pre-welding and multiple positioning, which improves the loading and welding efficiency.

[0033] 2. The bottom of the rotating seat assembly connected to the welding machine assembly is directly pressed on the metal plugging plate; the metal plugging plate is pressed up and down and the two ends of the rotating seat assembly are pressed, which enhances the anti-bending effect of the rotating seat assembly, and the rotating seat assembly rotates more stably on the metal plugging plate, thereby improving the welding quality.

[0034] 3. Using a single motor assembly as the power source for lifting the lifting device, rotating the rotating seat assembly, lifting the welding machine assembly, and positioning and clamping the pipe and metal plugging plate reduces the setting of the power device, simplifies the circuit structure, and reduces the equipment cost.

[0035] 4. After pulling out the pivot from the original pivot insertion hole, insert it into another pivot insertion hole of the socket group, change the distance from the pivot to the axis of the turntable, and adjust the swing amplitude of the pivot, so as to match the clamping and positioning of pipes of different diameters, expand the scope of product processing, and improve the efficiency of equipment use.

[0036] 5. The swing frame is fixedly connected to the plugging plate positioning module. The swing of the swing frame drives the synchronous swing of the plugging plate positioning module, so that the synchronous and automatic positioning of the pipe and the metal plugging plate can be completed in one swing, thereby improving the positioning efficiency.

[0037] 6. The pre-positioning of the metal plugging plate by the positioning inclined surface and the annular aperture emitted by the laser greatly reduce the difficulty of positioning the metal plugging plate during material feeding.

[0038] 7. When the external positioning swing assembly is used to position the pipe, the pressure plate opens the first swing arm after being compressed to achieve the center positioning of the rotating drum, which can improve the coaxiality between the rotating drum and the pipe, and enhance the rigidity of the rotating drum, making the welding trajectory of the welding machine assembly more accurate.

[0039] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A metal pipe inner seam welding machine, comprising a lifting device (1) and a weldment positioning assembly; a lifting platform (101) of the lifting device (1) is rotatably connected to a rotating seat assembly (2); a welding machine assembly (4) is arranged on the rotating seat assembly (2); a motor assembly (8) for driving the rotating seat assembly (2) to rotate is connected to the lifting platform (101); the weldment positioning assembly is arranged directly below the rotating seat assembly (2); Features: The weldment positioning assembly comprises a bottom frame (7), a loading platform (12) and a turntable (6) rotatably connected to the bottom frame (7); a lower pressure shaft (13) slidably connected to the bottom frame (7) is fixed at the bottom of the loading platform (12); at least three external positioning swing assemblies (5) are arranged on the bottom frame (7); the external positioning swing assemblies (5) are circumferentially distributed on the outside of the loading platform (12); the turntable (6) is slidably connected to the lower pressure shaft (13); at least one outer positioning swing assembly (5) is arranged on the shaft body of the lower pressure shaft (13); a wedge-shaped block (1301); a lower sliding ring (602) is fixed on the rotating disk (6), and the lower sliding ring (602) is sleeved on the outside of the lower pressure shaft (13); a second plunger (14) is fixed on the lower sliding ring (602) and is pressed against the surface of the wedge-shaped block (1301); the rotating disk (6) drives the external positioning swing assembly (5) to rotate after the rotating disk (6) rotates; a torsion spring (9) is connected between the lower sliding ring (602) and the bottom frame (7); and a pressure plate (205a) is rotatably connected to the bottom of the rotating seat assembly (2).

2. A metal pipe inner seam welding machine according to claim 1, characterized in that: The external positioning swing assembly (5) comprises a swing frame (503), an upper rotating shaft (504), a sliding outer cylinder (505) and a lower rotating shaft (506); the upper rotating shaft (504) and the lower rotating shaft (506) are both fixed on the sliding outer cylinder (505); the lower rotating shaft (506) is rotatably connected to the bottom frame (7); The interior of the sliding outer cylinder (505) is slidably connected to an inner sliding rod (507); the inner sliding rod (507) is rotatably connected to an eccentric position of the turntable (6); and a blocking plate positioning module (501) for positioning a metal blocking plate is provided on the swing frame (503).

3. A metal pipe inner seam welding machine according to claim 2, characterized in that: The rotating disk (6) is evenly distributed with a plurality of socket groups; the number of the socket groups is equal to the number of the external positioning swing components (5); the socket groups are composed of a plurality of pivot insertion holes (601a); the pivot insertion holes (601a) of the same socket group are arranged in sequence along the radial direction of the rotating disk (6); a sleeve (509) is fixed to the end of the inner sliding rod (507); a pivot (508) is inserted into the interior of the sleeve (509); the diameter of the pivot (508) and the inner diameter of the sleeve (509) are equal to the diameter of the pivot (508) and the inner diameter of the sleeve (509). The diameter of the hole is equal to the diameter of the pivot insertion hole (601a); an upper limit plate (5010) is fixed to one end of the pivot (508); the other end of the pivot (508) passes through the sleeve (509) from top to bottom and is inserted into one of the pivot insertion holes (601a) of the socket group; the diameter of the upper limit plate (5010) is larger than the inner hole diameter of the sleeve (509); the upper limit plate (5010) is a magnet; and a handle (5011) is fixed to the top of the upper limit plate (5010).

4. The metal pipe inner seam welding machine according to claim 3, characterized in that: A plurality of straight rods (601) are fixed on the rotating disk (6); the straight rods (601) are arranged along the circumferential direction of the rotating disk (6); and the number of the straight rods (601) is equal to the number of the socket groups.

5. The metal pipe inner seam welding machine according to claim 2, characterized in that: The swing frame (503) is provided with a second roller (502); the blocking plate positioning module (501) comprises a first bolt (501b), a first spring (501c), a side pressure block (501d) and a fixing seat (501a) fixed on the swing frame (503); the fixing seat (501a) is respectively provided with a slot hole (501a1), a first threaded hole (501a2) matching the first bolt (501b) and a guide slot (501a3) slidably connected to the side pressure block (501d). ; The first threaded hole (501a2) and the guide groove (501a3) are both connected to the slot hole (501a1); one end of the side pressure block (501d) passes through the guide groove (501a3) and extends to the outside of the fixed seat (501a); the other end of the side pressure block (501d) extends into the slot hole (501a1); a second retaining ring (501d1) is provided at one end of the side pressure block (501d) extending into the slot hole (501a1); a round shaft is fixed on the second retaining ring (501d1) (501d2); the first bolt (501b) is threadedly connected to the first threaded hole (501a2); the first bolt (501b) is extended into the slot hole (501a1) and one end is provided with a first retaining ring (501b1); the two ends of the first spring (501c) are respectively sleeved on the first bolt (501b) and the round shaft (501d2); the two ends of the first spring (501c) are respectively pressed against the second retaining ring (501d1) and the first retaining ring (501b1); the A positioning bevel (501d3) is provided at one end of the side pressure block (501d) extending out of the fixing seat (501a); the positioning bevel (501d3) is provided between the top surface of the side pressure block (501d) and the side surface of the side pressure block (501d); a vertical positioning surface (501d4) is provided between the bottom surface of the side pressure block (501d) and the positioning bevel (501d3); a groove hole is provided at the bottom of the pressure plate (205a); and a laser locator (205d) is fixed inside the groove hole.

6. The metal pipe inner seam welding machine according to claim 1, characterized in that: The welding machine assembly (4) comprises a welding machine body (401), a cylinder (402) and a horizontal swing arm (403); one end of the horizontal swing arm (403) is hinged on the outer side wall of the rotating seat assembly (2), and the other end is fixed to the welding machine body (401); one end of the cylinder (402) is hinged on the outer side wall of the rotating seat assembly (2), and the other end is hinged on the rod body of the horizontal swing arm (403); the horizontal swing arm (403) is in an arc shape.

7. The metal pipe inner seam welding machine according to claim 1, characterized in that: The rotating seat assembly (2) comprises a connecting cover (201), a rotating drum (204), and a sliding shaft (205) slidably connected to the interior of the rotating drum (204); a plurality of connecting plates (202) are fixed between the connecting cover (201) and the top of the rotating drum (204); a sliding shaft limiting plate (203) is fixed to one end of the sliding shaft (205), and the other end passes through the inner hole of the rotating drum (204) from top to bottom and is then fixed to the pressing plate (205a); The bottom end surface of the rotating drum (204) is provided with a cavity (204a); an upper limit ring (205c) and a lower limit ring (10) are fixed on the sliding shaft (205); a plurality of through holes (204b) connected to the cavity (204a) are opened on the side wall of the rotating drum (204); the through holes (204b) are distributed in a circular pattern on the rotating drum (204); the plurality of through holes (204b) are all connected to an inner positioning rod assembly (3); the inner positioning rod assembly (3) is provided with a plurality of through holes (204c) and a lower positioning ring (10) is fixed on the sliding shaft (205); a plurality of through holes (204b) are provided on the side wall of the rotating drum (204); the through holes (204b) are distributed in a circular pattern on the rotating drum (204); the plurality of through holes (204b) are all connected to an inner positioning rod assembly (3); the inner positioning rod assembly (3) is provided with a plurality of through holes (204c) and a lower positioning ring (10) is fixed on the sliding shaft (205); the inner positioning rod assembly (3) is provided with a plurality of through holes (204b ... provided on the sliding shaft (205); the inner positioning rod assembly (3) is provided with a plurality of through holes (204b) and a lower positioning ring (10) is provided on the sliding shaft (205); the inner positioning rod assembly (3 The positioning rod assembly (3) comprises a first swing rod (302) rotatably connected in the through hole (204b); one end of the first swing rod (302) extends between the upper positioning ring (205c) and the lower positioning ring (10); a roller bracket (303) is provided at the other end of the first swing rod (302); a first roller (303a) is rotatably connected to the roller bracket (303); and the connection cover (201) is connected to the motor assembly (8).

8. The metal pipe inner seam welding machine according to claim 7, characterized in that: A plurality of positioning holes (205b) are provided on the side wall of the sliding shaft (205); the positioning holes (205b) are arranged along the circumferential direction of the sliding shaft (205); a lower sliding sleeve (1001) is fixed on the lower limiting ring (10); a second threaded hole (1001a) is provided on the lower sliding sleeve (1001); a second bolt (11) is threadedly connected to the second threaded hole (1001a); the diameter of the second bolt (11) is equal to the diameter of the positioning hole (205b); the end of the second bolt (11) is inserted into one of the positioning holes (205b); a straight slot hole (204c) connected to the cavity (204a) is provided on the side wall of the rotating drum (204); A notch is provided at the end of the first swing rod (302); the roller bracket (303) is rotatably connected to the notch; a second spring (304) is connected between the inner bottom wall of the notch and the roller bracket (303); and a first plunger (301) is fixed to the side of the first swing rod (302) facing the lower limit ring (10).

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