Automatic forming machine for flexible bell and spigot of spiral steel pipe

Abstract

The invention relates to the technical field of metal forming, in particular to a spiral steel pipe flexible bell and spigot automatic forming machine which comprises a base, a steel pipe is arranged at the upper end of the base, a limiting rotation structure capable of conducting limiting rotation on the steel pipe is arranged at the upper end of the base, a second air cylinder is fixedly connected to the lower end of the base, and a connecting plate is installed at the output end of the second air cylinder. An elastic sealing structure capable of abutting against the steel pipe is installed on the side surface of the upper end of the connecting plate, a connecting column is fixedly connected to the inner wall of the elastic sealing structure, and a reaming cone is fixedly connected to the end, close to the steel pipe, of the connecting column. And then by changing the position of air suction and air outlet of an air pump, an inserting connection structure and a heat preservation structure are matched with each other, the outer side wall of the steel pipe is heated, and meanwhile scrap iron on the inner wall of the steel pipe can be removed in the process that the steel pipe retreats from the hole rotating cone.

Description

Technical Field

[0001] The invention relates to the technical field of metal forming, in particular to an automatic forming machine for the flexible socket of a spiral steel pipe. Background Art

[0002] Socket and spigot connections have always been the mainstream in pipeline engineering, especially in the fields of cement pipes and cast iron pipes. However, traditional steel pipes have thin walls and are difficult to process socket joints, so they have long relied on welding or flange connections, resulting in high on-site construction costs and low efficiency. To address this problem, cold processing expansion forming technology came into being. The core of this technology is to radially extrude the steel pipe port through a mold to form a socket and spigot with a self-sealing structure.

[0003] A method for maintaining the wall thickness of a steel pipe socket with publication number CN109317570A is characterized in that: in the steel pipe socket processing system of the present invention, a high-frequency heating coil is used for heating, and then a roughing pad is used to roughen the end of the steel pipe, and then the special expanding device of the present invention is used to evenly expand the roughened end of the steel pipe, thereby ensuring that the wall thickness of the end of the steel pipe after expansion is consistent with the rest of the steel pipe, and ensuring the flow rate of the medium in the steel pipe.

[0004] However, in the process of expanding the socket while rotating the steel pipe, a certain amount of iron chips will be generated. If these iron chips slide to the bottom of the pipe, the friction between the expansion cone and the pipe wall will increase during the expansion process, affecting the expansion efficiency and easily causing scratches on the inner wall of the steel pipe. At the same time, in the process of the diameter of the steel pipe being squeezed by the expansion cone and continuously increasing, the outer wall of the steel pipe is more prone to tearing due to its larger diameter than the inner wall, which will ultimately affect the quality of the finished product of the steel pipe socket forming. Summary of the invention

[0005] The purpose of the invention is to provide an automatic forming machine for the flexible socket of a spiral steel pipe to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic forming machine for a spiral steel pipe flexible socket, comprising a base, a steel pipe is arranged at the upper end of the base, a limited rotation structure capable of limiting the rotation of the steel pipe is arranged at the upper end of the base, a cylinder 2 is fixedly connected to the lower end of the base, a connecting plate is installed at the output end of the cylinder 2, and an elastic sealing structure capable of contacting the steel pipe is installed on the side surface of the upper end of the connecting plate; The inner wall of the elastic sealing structure is fixedly connected with a connecting column, an end of the connecting column close to the steel pipe is fixedly connected with a reaming cone, and an end of the connecting column away from the steel pipe is fixedly connected with a connecting block, and the outer wall of the reaming cone is provided with a plurality of air grooves 1, and the inner cavity bottom of each air groove 1 is commonly connected with an air groove 2, and a sewage cavity connected with the air groove 2 is provided inside the connecting column, and a filtering backwashing structure capable of filtering iron filings is arranged inside the sewage cavity; A positioning tube is fixedly connected to one end of the connecting block, and an L-shaped sliding tube is slidably connected to the upper and lower ends of the positioning tube. A piston tube is fixedly installed on the side of each L-shaped sliding tube close to the reaming cone, and an arc-shaped shell is fixedly connected to the end of the piston tube close to the reaming cone. An arc-shaped plate that can slide up and down is arranged inside the arc-shaped shell, and two sets of plug-in structures are arranged at both ends of the arc-shaped plate, and a heat preservation and heating structure is arranged inside the plug-in structure.

[0007] Preferably, the filtering backwash structure includes a drainage chamber, the inner wall of which is fixedly connected with an L-shaped drainage pipe connected to the second air groove, a filter screen is installed on the inner wall of the drainage chamber away from the L-shaped drainage pipe, and a pumping plate is slidably connected to the inner bottom of the drainage chamber.

[0008] Preferably, a cylindrical cavity connected to the sewage chamber is opened inside the connecting block, and the side of the cylindrical cavity away from the sewage chamber is connected to the positioning tube. The inner bottom of the cylindrical cavity is rotatably connected to an air pump, and the outer wall of the air pump is fixedly connected to two symmetrically arranged arc-shaped grooved tubes, and the air pump is respectively connected to the sewage chamber and the positioning tube, and the inner top of the cylindrical cavity is fixedly connected to a servo motor, and the output end of the servo motor is fixedly connected to the air pump.

[0009] Preferably, the elastic sealing structure includes a positioning ring, which is fixed to the outer wall of the connecting column and connected to the connecting plate. A sealing gasket is slidably connected to the outer wall of the connecting column close to the expansion cone, and a spring is fixed between the sealing gasket and the positioning ring.

[0010] Preferably, two cylinders 1 that are symmetrical up and down are fixedly connected to one side of the positioning ring away from the spring, and the output end of the cylinder 1 is fixedly connected to the L-shaped sliding tube at the corresponding position.

[0011] Preferably, the plug-in structure includes an arc-shaped plate, a movable rod is fixedly connected to the upper end of the arc-shaped plate, and the movable rod is slidably connected to the L-shaped sliding tube, the outer wall of the movable rod is fixedly connected to a two-way piston slidably connected to the piston tube, arc-shaped connecting strip 1 is symmetrically fixedly connected to both sides of the arc-shaped plate, the outer wall of arc-shaped connecting strip 1 is sleeved with arc-shaped strip 1, the end of arc-shaped strip 1 away from the arc-shaped plate is fixedly connected with arc-shaped connecting strip 2, and the outer wall of arc-shaped connecting strip 2 is sleeved with arc-shaped strip 2.

[0012] Preferably, the heat-insulating heating structure includes a heating block, which is respectively installed on the side of the arc-shaped connecting strip 1 and the arc-shaped connecting strip 2 close to the hole-expanding cone. The inner walls of the arc-shaped strip 1 and the arc-shaped strip 2 are provided with a sliding groove, and the side of the sliding groove close to the hole-expanding cone is provided with a heat dissipation groove. The side of the arc-shaped strip 2 away from the hole-expanding cone is fixedly connected with an inclined sliding block, and an inclined sliding cylinder is slidably connected to the outer wall of the inclined sliding block. Two symmetrically arranged protective shells are fixedly connected on both sides of the arc shell, and a positioning column slidably connected to the inclined sliding cylinder is fixedly provided on the cavity top of the protective shell, and a return spring fixedly provided on the outer wall of the positioning column and connected to the protective shell, and the lower end of the return spring is fixedly connected to the inclined sliding cylinder.

[0013] Preferably, a push piece is fixedly connected to the outer wall of the movable rod, a wind-blocking plate is slidably connected to the outer wall of the L-shaped sliding tube, two upper and lower limit plates are fixedly connected to one side of the wind-blocking plate, and the limit plates can interfere with the push piece.

[0014] Preferably, the limited rotation structure includes an active roller 2, which is installed at the upper end of the base and contacts the lower end of the steel pipe. Two groups of cylinders 3 are symmetrically installed on the upper end of the base, and the output end of each group of cylinders 3 is commonly connected to a positioning rod. An active roller 1 that contacts the steel pipe is rotatably connected between the two positioning rods. A motor 2 is fixedly connected to the outer wall of the positioning rod, and the output end of the motor 2 is fixedly connected to the active roller 1. A motor 1 is fixedly connected to the upper end of the base, and the output end of the motor 1 is connected to the active roller 2 through a crawler transmission. Two driven rollers are symmetrically contacted on both sides of the steel pipe, and both ends of each driven roller are rotatably connected to an L-shaped electric slide rod, and the lower end of the L-shaped electric slide rod is slidably connected to the base.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The steel pipe is driven to rotate by the active rollers 2 and 1, so that the force exerted on the steel pipe during the expansion of the socket is more uniform, and then the air pump is used to suck air from the outside of the expansion cone, and the heat is discharged to the surface of the steel pipe through the arc shell, while the heating block is continuously exposed from the cavity of the sliding groove, and the outer surface of the steel pipe can be further heated while preheating the heating block. Then, when the expansion of the steel pipe is completed and the expansion cone is withdrawn from the steel pipe cavity, the air pump will change the direction of air intake and air discharge, so as to backwash the filter screen, and at the same time, the inner wall of the steel pipe is cleaned by jetting air through the air groove 1 during the movement of the expansion cone, and at the same time, the elastic reset of the reset spring during the process of sucking air into the arc shell enables the plug-in structure to impact the outer surface of the steel pipe, thereby knocking down the iron filings on the inner wall of the steel pipe, further improving the cleaning effect of the inner wall of the steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further explained below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention from another angle; Figure 3 It is a schematic structural diagram of the hole expansion cone of the present invention; Figure 4 It is a schematic diagram of a three-dimensional cross-sectional structure of a connecting column of the present invention; Figure 5 It is a partial cross-sectional structural schematic diagram of the movable rod of the present invention; Figure 6 It is a schematic diagram of the planar cross-sectional structure of the arc-shaped shell of the present invention; Figure 7It is a structural schematic diagram of the curved plate of the present invention; Figure 8 For the present invention Figure 6 A partial enlarged view of the middle A; Fig. 9 is a schematic top view of the servo motor of the present invention; Fig.10 It is a three-dimensional exploded view of the air-blocking plate of the present invention.

[0017] Description of reference numerals: 1. Expansion cone; 2. Connecting column; 3. Connecting block; 4. Positioning ring; 5. Sealing pad; 6. Spring; 7. Steel pipe; 8. Positioning tube; 9. L-shaped sliding tube; 10. Piston tube; 11. Arc shell; 12. Movable rod; 13. Bidirectional piston; 14. Arc plate; 15. Arc connecting strip 1; 151. Arc connecting strip 2; 16. Arc strip 1; 161. Arc strip 2; 17. Heating block; 18. Sliding groove; 19. Heat dissipation groove; 20. Inclined slider; 21. Inclined slide cylinder; 22. Positioning column; 23. Return spring; 24. Protection Shell; 25, push piece; 26, limit plate; 27, air shut-off plate; 28, air slot one; 29, air slot two; 30, sewage chamber; 31, L-shaped sewage pipe; 32, extraction plate; 33, cylindrical chamber; 34, arc-shaped notch pipe; 35, servo motor; 36, air pump; 37, cylinder one; 38, filter screen; 39, cylinder two; 40, connecting plate; 41, base; 42, positioning rod; 43, motor one; 44, active roller one; 45, active roller two; 46, cylinder three; 47, motor two; 48, driven roller; 49, L-shaped electric slide rod. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 10 The present invention provides a technical solution: an automatic forming machine for a spiral steel pipe flexible socket, comprising a base 41, a steel pipe 7 is arranged at the upper end of the base 41, a limited rotation structure capable of limiting the rotation of the steel pipe 7 is arranged at the upper end of the base 41, a cylinder 2 39 is fixedly connected to the lower end of the base 41, a connecting plate 40 is installed at the output end of the cylinder 2 39, and an elastic sealing structure capable of contacting the steel pipe 7 is installed on the side surface of the upper end of the connecting plate 40; The inner wall of the elastic sealing structure is fixedly connected with a connecting column 2, and the end of the connecting column 2 close to the steel pipe 7 is fixedly connected with a reaming cone 1, and the end of the connecting column 2 away from the steel pipe 7 is fixedly connected with a connecting block 3. The outer wall of the reaming cone 1 is provided with a plurality of air grooves 28, and the inner cavity bottom of each air groove 28 is commonly connected with an air groove 29. The interior of the connecting column 2 is provided with a sewage cavity 30 connected with the air groove 29, and the interior of the sewage cavity 30 is provided with a filtering backwashing structure capable of filtering iron filings; A positioning tube 8 is fixedly connected to one end of the connecting block 3, and an L-shaped sliding tube 9 is slidably connected to the upper and lower ends of the positioning tube 8. A piston tube 10 is fixedly installed on the side of each L-shaped sliding tube 9 close to the reaming cone 1, and an arc shell 11 is fixedly connected to the end of the piston tube 10 close to the reaming cone 1. An arc plate 14 that can slide up and down is arranged inside the arc shell 11, and two groups of plug-in structures are arranged at both ends of the arc plate 14, and a heat preservation and heating structure is arranged inside the plug-in structure, wherein the position of the arc shell 11 is relatively forward relative to the position of the reaming cone 1, and the arc shell 11 and the reaming cone 1 are synchronously movable, so that during the movement of the reaming cone 1, the hole expansion of the steel pipe 7 will not conflict with the arc shell 11 due to the increase in the outer diameter of the steel pipe 7.

[0020] Among them, the filtering backwash structure includes a sewage chamber 30, the inner wall of which is fixedly connected with an L-shaped sewage pipe 31 connected with the air groove 29, a filter screen 38 is installed on the inner wall of the sewage chamber 30 away from the L-shaped sewage pipe 31, and a pumping plate 32 is slidably connected to the inner bottom of the sewage chamber 30.

[0021] Among them, a cylindrical cavity 33 connected to the sewage chamber 30 is opened inside the connecting block 3, and the side of the cylindrical cavity 33 away from the sewage chamber 30 is connected to the positioning tube 8. The inner bottom of the cylindrical cavity 33 is rotatably connected to an air pump 36, and the outer wall of the air pump 36 is fixedly connected to two symmetrically arranged arc-shaped grooved tubes 34, and the air pump 36 is respectively connected to the sewage chamber 30 and the positioning tube 8, and the inner top of the cylindrical cavity 33 is fixedly connected to a servo motor 35, and the output end of the servo motor 35 is fixedly connected to the air pump 36.

[0022] Specifically, refer to Figure 3When the expansion cone 1 gradually squeezes the inner wall of the steel pipe 7 through the conical structure to expand the socket, the limit rotation structure will also drive the steel pipe 7 to rotate, so that the force on the steel pipe 7 is more uniform when the socket is expanded. At the same time, the friction between the inner wall of the steel pipe 7 and the expansion cone 1 generates heat, which can reduce the tearing of the pipeline when the socket is expanded. At this time, a certain amount of iron filings and heat will be generated during the expansion process. The iron filings generated at this time will slide down along the inclined surface of the cone head of the expansion cone 1. At this time, the air pump 36 will start, and the air will be pumped through the air groove 1 28 and the air groove 2 29. The inside of the steel pipe 7 is sucked, and then discharged to the bottom of the inner cavity of the sewage chamber 30 through the L-shaped sewage pipe 31. After that, the hot air will be sucked into the inside of the positioning pipe 8 by the air pump 36 through the filter screen 38. The positioning pipe 8 is transmitted to the inside of the arc shell 11 through the L-shaped sliding pipe 9 and the piston tube 10, and then sprayed from the inside of the arc shell 11 to the outer surface of the steel pipe 7, thereby heating the outer surface of the steel pipe 7, further preventing the steel pipe 7 from being torn when the steel pipe 7 is expanded. At the same time, the filter screen 38 filters the iron filings. Figure 8 The end of the arc-shaped slotted tube 34 away from the air pump 36 is slightly arc-shaped and can fit tightly with the cylindrical inner wall of the cylindrical cavity 33, so that the air inlet and outlet of the air pump 36 are connected to the sewage cavity 30 and the positioning tube 8 respectively, and when the hole expansion of the steel pipe 7 is completed, the servo motor 35 will drive the air pump 36 to rotate 180 degrees. At this time, the positions of the air outlet and the air inlet of the air pump 36 will be swapped. At this time, starting the air pump 36 will blow air into the sewage cavity 30, and the filter screen 38 can be backwashed at this time to blow out the iron filings on the surface of the filter screen 38, and the iron filings can be extracted by pulling out the extraction plate 32. When the air pump 36 blows air into the sewage cavity 30, the gas will also be blown out from the slot of the air groove 1 28 through the air groove 2 29, so that the inner wall of the steel pipe 7 is blown to remove the iron filings in the process of the reaming cone 1 withdrawing from the hole of the steel pipe 7.

[0023] Among them, the elastic sealing structure includes a positioning ring 4, which is fixed on the outer wall of the connecting column 2 and connected to the connecting plate 40. A sealing gasket 5 is slidingly connected on the outer wall of the connecting column 2 close to the expanding cone 1, and a spring 6 is fixed between the sealing gasket 5 and the positioning ring 4.

[0024] Specifically, when the reaming cone 1 is expanding the hole on the inner wall of the steel pipe 7, the reaming cone 1 will continue to advance in the direction of the steel pipe 7. At this time, the sealing gasket 5 will contact the outer surface of the spring 6. As the reaming cone 1 is advanced, the sealing gasket 5 will continue to move. At the same time, the spring 6 is compressed, causing the sealing gasket 5 to come into contact with the pipe mouth of the steel pipe 7, thereby sealing one end of the steel pipe 7 and reducing heat loss.

[0025] Among them, two upper and lower symmetrical cylinders 37 are fixedly connected to the side of the positioning ring 4 away from the spring 6, and the output end of the cylinder 37 is fixedly connected to the L-shaped sliding tube 9 at the corresponding position. When the expansion cone 1 has completed the expansion of the socket of the steel pipe 7 and the arc shell 11 needs to be withdrawn from the outer wall of the steel pipe 7, the cylinder 37 can be used to push the L-shaped sliding tube 9 to move away from the connecting column 2, and the arc shell 11 will also move at the same time, so that when the expansion cone 1 is retracted, the arc shell 11 will not contact the outer wall of the expanded steel pipe 7.

[0026] Among them, the plug-in structure includes an arc-shaped plate 14, the upper end of the arc-shaped plate 14 is fixedly connected with a movable rod 12, and the movable rod 12 is slidably connected to the L-shaped sliding tube 9, the outer wall of the movable rod 12 is fixedly connected with a two-way piston 13 slidably connected to the piston tube 10, and the two sides of the arc-shaped plate 14 are symmetrically fixed with an arc-shaped connecting strip 15, and the outer wall of the arc-shaped connecting strip 15 is sleeved with an arc-shaped strip 16, and the end of the arc-shaped strip 16 away from the arc-shaped plate 14 is fixedly connected with an arc-shaped connecting strip 2 151, and the outer wall of the arc-shaped connecting strip 2 151 is sleeved with an arc-shaped strip 2 161.

[0027] The heat preservation and heating structure comprises a heating block (17), which is respectively installed on one side of the arc connecting strip 1 (15) and the arc connecting strip 2 (151) close to the reaming cone (1). The inner walls of the arc strip 16 and the arc strip 2 161 are both provided with a sliding groove 18, and the side of the sliding groove 18 close to the reaming cone 1 is provided with a heat dissipation groove 19. The side of the arc strip 2 161 away from the reaming cone 1 is fixedly connected with an inclined sliding block 20, and an inclined sliding cylinder 21 is slidably connected to the outer wall of the inclined sliding block 20. Two symmetrically arranged protective shells 24 are fixedly connected to the two sides of the arc shell 11, and the cavity top of the protective shell 24 is fixedly connected with a positioning column 22 slidably connected to the inclined sliding cylinder 21. The outer wall of the positioning column 22 is sleeved with a return spring 23 fixedly connected to the protective shell 24, and the lower end of the return spring 23 is fixedly connected to the inclined sliding cylinder 21.

[0028] Among them, a push piece 25 is fixedly connected to the outer wall of the movable rod 12, and a wind blocking plate 27 is slidably connected to the outer wall of the L-shaped sliding tube 9. One side of the wind blocking plate 27 is fixedly connected to two upper and lower distributed limit plates 26, and the limit plates 26 can interfere with the push piece 25.

[0029] Specifically, refer to Figure 7When the arc-shaped connecting strip 15 and the arc-shaped connecting strip 2 151 are not fully inserted into the cavity of the sliding groove 18, the heating block 17 will not overlap with the heat exhaust groove 19. At this time, the side of the heating block 17 will be blocked by the sliding groove 18, thereby storing the temperature of the heating block 17, so that the heating block 17 can be preheated quickly. When the air pump 36 blows air to the piston tube 10, the two-way piston 13 will be pushed to slide downward, and the arc plate 14 will also slide downward. During the sliding process of the arc plate 14, the arc-shaped connecting strip 15 and the arc-shaped connecting strip 2 will be pushed. 151 are fully inserted into the cavity of the sliding groove 18, at this time, the circular shape formed by the arc plate 14, the arc strip 1 16 and the arc strip 2 161 will be reduced, so that it can better fit with the outer wall of the steel pipe 7 that has not been expanded. At the same time, the heating block 17 overlaps with the heat exhaust groove 19, so that the heat stored in the heating block 17 is released to the outer surface of the steel pipe 7, thereby improving the heating effect on the outer wall of the steel pipe 7. When the two-way piston 13 passes through the lower notch of the piston tube 10, the hot gas will be discharged, and the outer wall of the steel pipe 7 will be heated again together; When the reaming cone 1 retreats and moves away from the steel pipe 7, the air pump 36 exchanges the positions of the air inlet and the air outlet, which starts to suck air into the piston tube 10. The two-way piston 13 inside the piston tube 10 is driven to slide upward by the suction, and the push piece 25 also slides with it. At the same time, the return spring 23 is compressed. When the push piece 25 contacts the upper limit plate 26 and pushes it to slide upward, the air blocking plate 27 will slide upward, so that the blockage of the L-shaped sliding tube 9 by the air blocking plate 27 is opened, and the suction force generated inside the piston tube 10 will not be able to drive the two-way piston 13 to continue to slide upward. At this time, the elastic restoring force of the return spring 23 will drive the arc plate 14, arc strip 1 16 and arc strip 2 16 1 rapidly descends and approaches the position of the steel pipe 7, thereby impacting the surface of the steel pipe 7, so that the iron filings inside the steel pipe 7 are loosened by the impact, which is convenient for the air groove 1 28 to blow them off. At the same time, since the diameter of the steel pipe 7 is enlarged at this time, the arc-shaped connecting strip 15 and the arc-shaped connecting strip 2 151 cannot be fully inserted into the corresponding arc-shaped strip 1 16 and the arc-shaped strip 2 161, so that the heating block 17 will not overlap with the heat exhaust groove 19, thereby protecting the heating block 17. The arc-shaped plate 14, the arc-shaped strip 1 16 and the arc-shaped strip 2 161 move toward the direction of the steel pipe 7 while approaching each other, so that the outer surface of the steel pipe 7 can be contacted more evenly, thereby preventing the outer surface of the steel pipe 7 from being damaged.

[0030] Among them, the limited rotation structure includes an active roller 2 45, which is installed at the upper end of the base 41 and conflicts with the lower end of the steel pipe 7. Two groups of cylinders 3 46 are symmetrically installed on the upper end of the base 41, and the output end of each group of cylinders 3 46 is commonly connected to a positioning rod 42, and an active roller 1 44 that conflicts with the steel pipe 7 is rotatably connected between the two positioning rods 42. A motor 2 47 is fixedly connected to the outer wall of the positioning rod 42, and the output end of the motor 2 47 is fixedly connected to the active roller 1 44. A motor 1 43 is fixedly connected to the upper end of the base 41, and the output end of the motor 1 43 is connected to the active roller 2 45 through a crawler transmission. Two driven rollers 48 are symmetrically conflicted on both sides of the steel pipe 7, and both ends of each driven roller 48 are rotatably connected to an L-shaped electric slide rod 49, and the lower end of the L-shaped electric slide rod 49 is slidably connected to the base 41.

[0031] Working principle: First, the cylinder 3 46 drives the active roller 1 44 to be lifted, and then the worker first transports the steel pipe 7 to between the active roller 2 45 and the active roller 1 44 through the cart, and then the L-shaped electric slide bar 49 limits the steel pipe 7, and then the active roller 1 44 drops again and clamps the steel pipe 7 between the active roller 2 45 and the active roller 1 44, and then the worker can start the cylinder 2 39 to push the expansion cone 1 to perform extrusion expansion on the steel pipe 7, and at the same time, the active roller 2 45 and the active roller 1 44 drive the steel pipe 7 to rotate, so that the steel pipe 7 is subjected to more uniform force when the socket is expanded, and then during the expansion process, the air pump 36 can be started to suck air from the outside of the expansion cone 1, and the heat is discharged to the steel pipe 7 through the arc shell 11. , and at the same time, the heating block 17 is continuously exposed from the cavity of the sliding groove 18. While preheating the heating block 17, the outer surface of the steel pipe 7 can be further heated. Then, when the hole expansion of the steel pipe 7 is completed and the hole expansion cone 1 withdraws from the cavity of the steel pipe 7, the air pump 36 will change the direction of air intake and air outlet, thereby backwashing the filter screen 38. At the same time, during the movement of the hole expansion cone 1, the inner wall of the steel pipe 7 is cleaned by jetting through the air groove 28. At the same time, during the process of air inhalation into the arc shell 11, the elastic reset of the reset spring 23 enables the plug-in structure to impact the outer surface of the steel pipe 7, thereby knocking down the iron filings on the inner wall of the steel pipe 7, further improving the cleaning effect of the inner wall of the steel pipe 7.

[0032] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic forming machine for a flexible socket of a spiral steel pipe, comprising a base (41), characterized in that: A steel pipe (7) is arranged at the upper end of the base (41); a limited rotation structure capable of limiting the rotation of the steel pipe (7) is arranged at the upper end of the base (41); a second cylinder (39) is fixedly connected to the lower end of the base (41); a connecting plate (40) is installed at the output end of the second cylinder (39); and an elastic sealing structure capable of contacting the steel pipe (7) is installed on the side surface of the upper end of the connecting plate (40); The inner wall of the elastic sealing structure is fixedly connected to a connecting column (2), one end of the connecting column (2) close to the steel pipe (7) is fixedly connected to a reaming cone (1), and one end of the connecting column (2) away from the steel pipe (7) is fixedly connected to a connecting block (3), the outer wall of the reaming cone (1) is provided with a plurality of air grooves (28), the inner cavity bottom of each air groove (28) is commonly connected to an air groove (29), a sewage discharge cavity (30) connected to the air groove (29) is provided inside the connecting column (2), and a filtering backwashing structure capable of filtering iron filings is provided inside the sewage discharge cavity (30); A positioning tube (8) is fixedly connected to one end of the connection block (3), and the upper and lower ends of the positioning tube (8) are slidably connected to L-shaped sliding tubes (9). A piston tube (10) is fixedly installed on one side of each L-shaped sliding tube (9) close to the expansion cone (1), and an arc-shaped shell (11) is fixedly connected to one end of the piston tube (10) close to the expansion cone (1). An arc-shaped plate (14) capable of sliding up and down is arranged inside the arc-shaped shell (11), and two groups of plug-in structures are arranged at both ends of the arc-shaped plate (14), and a heat preservation and heating structure is arranged inside the plug-in structure.

2. According to claim 1, a spiral steel pipe flexible socket automatic forming machine is characterized by: The filtering backwashing structure comprises a sewage discharge chamber (30), an inner side wall of the sewage discharge chamber (30) being fixedly connected to an L-shaped sewage discharge pipe (31) communicating with the second air groove (29), a filter screen (38) being installed on the inner side wall of the sewage discharge chamber (30) away from the L-shaped sewage discharge pipe (31), and a pumping plate (32) being slidably connected to the inner bottom of the sewage discharge chamber (30).

3. According to claim 2, a spiral steel pipe flexible socket automatic forming machine is characterized by: A cylindrical cavity (33) communicating with the sewage discharge cavity (30) is provided inside the connection block (3); a side of the cylindrical cavity (33) away from the sewage discharge cavity (30) is communicated with the positioning tube (8); an air pump (36) is rotatably connected to the inner cavity bottom of the cylindrical cavity (33); two symmetrically arranged arc-shaped notched tubes (34) are fixedly connected to the outer wall of the air pump (36); the air pump (36) is respectively communicated with the sewage discharge cavity (30) and the positioning tube (8); a servo motor (35) is fixedly connected to the inner cavity top of the cylindrical cavity (33); and an output end of the servo motor (35) is fixedly connected to the air pump (36).

4. According to claim 1, a spiral steel pipe flexible socket automatic forming machine is characterized by: The elastic sealing structure comprises a positioning ring (4), the positioning ring (4) being fixedly connected to the outer wall of the connecting column (2), and the positioning ring (4) being connected to the connecting plate (40), a sealing gasket (5) being slidably connected to the outer wall of the connecting column (2) close to the expansion cone (1), and a spring (6) being fixedly connected between the sealing gasket (5) and the positioning ring (4).

5. An automatic forming machine for flexible sockets of spiral steel pipes according to claim 4, characterized in that: Two cylinders (37) symmetrically arranged in an upper and lower direction are fixedly connected to one side of the positioning ring (4) away from the spring (6), and the output end of the cylinder (37) is fixedly connected to an L-shaped sliding tube (9) at a corresponding position.

6. An automatic forming machine for flexible sockets of spiral steel pipes according to claim 1, characterized in that: The plug-in structure comprises an arc-shaped plate (14), the upper end of which is fixedly connected to a movable rod (12), and the movable rod (12) is slidably connected to an L-shaped sliding tube (9), the outer wall of the movable rod (12) is fixedly connected to a bidirectional piston (13) slidably connected to a piston tube (10), arc-shaped connecting strips (15) are symmetrically fixedly connected to both sides of the arc-shaped plate (14), an arc-shaped connecting strip (16) is sleeved on the outer wall of the arc-shaped connecting strip (15), an arc-shaped connecting strip (151) is fixedly connected to one end of the arc-shaped connecting strip (16) away from the arc-shaped plate (14), and an arc-shaped connecting strip (161) is sleeved on the outer wall of the arc-shaped connecting strip (151).

7. An automatic forming machine for flexible sockets of spiral steel pipes according to claim 6, characterized in that: The heat preservation and heating structure comprises a heating block (17), the heating block (17) being respectively mounted on one side of the arc-shaped connecting strip (15) and the arc-shaped connecting strip (151) close to the hole expansion cone (1), the inner side walls of the arc-shaped connecting strip (16) and the arc-shaped connecting strip (161) are both provided with a sliding groove (18), the side of the sliding groove (18) close to the hole expansion cone (1) is provided with a heat dissipation groove (19), and the side of the arc-shaped connecting strip (161) away from the hole expansion cone (1) is fixedly connected with an inclined The slider (20) is slidably connected to an inclined slide cylinder (21) on the outer side wall of the inclined slider (20), two symmetrically arranged protective shells (24) are fixedly connected to the two sides of the arc-shaped shell (11), a positioning column (22) slidably connected to the inclined slide cylinder (21) is fixedly connected to the cavity top of the protective shell (24), and a return spring (23) fixedly connected to the protective shell (24) is sleeved on the outer side wall of the positioning column (22), and the lower end of the return spring (23) is fixedly connected to the inclined slide cylinder (21).

8. An automatic forming machine for flexible sockets of spiral steel pipes according to claim 6, characterized in that: A push piece (25) is fixedly connected to the outer wall of the movable rod (12), and a wind-blocking plate (27) is slidably connected to the outer wall of the L-shaped sliding tube (9). Two upper and lower limit plates (26) are fixedly connected to one side of the wind-blocking plate (27), and the limit plates (26) can be in contact with the push piece (25).

9. An automatic forming machine for flexible sockets of spiral steel pipes according to claim 1, characterized in that: The limited rotation structure comprises an active roller 2 (45), which is mounted on the upper end of the base (41) and contacts the lower end of the steel pipe (7). Two groups of cylinders 3 (46) are symmetrically mounted on the upper end of the base (41). The output end of each group of cylinders 3 (46) is commonly connected to a positioning rod (42). An active roller 1 (44) that contacts the steel pipe (7) is rotatably connected between the two positioning rods (42). A motor 2 is fixedly connected to the outer wall of the positioning rod (42). (47), and the output end of the second motor (47) is fixedly connected to the active roller one (44), the upper end of the base (41) is fixedly connected to the motor one (43), and the output end of the motor one (43) is connected to the active roller two (45) through a crawler transmission, and two driven rollers (48) are symmetrically abutted on both sides of the steel pipe (7), and both ends of each driven roller (48) are rotatably connected to an L-shaped electric slide rod (49), and the lower end of the L-shaped electric slide rod (49) is slidably connected to the base (41).

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