Gap closing mold for steel pipe production

Abstract

The invention provides a gap closing mold for steel pipe production, and belongs to the technical field of steel pipe production, the gap closing mold comprises a supporting table, a driving assembly, a vertical pressing assembly, a side pressing assembly, a pipe pushing assembly and a welding gun, a semicircular notch is formed in the upper portion of the supporting table, and the vertical pressing assembly is arranged above the semicircular notch; the pressing assembly is arranged on the upper portion of the supporting table and used for pressing a straight steel plate into the semicircular notch so that the straight steel plate can form a U-shaped structure, the side pressing assembly is arranged on the side of the semicircular notch and used for laterally pressing the steel plate of the U-shaped structure so that the steel plate of the U-shaped structure can form a round steel pipe, and the welding gun is fixedly arranged on the upper portion of the supporting table. One end of the pipe pushing assembly extends to the position above the supporting table, and the other end of the pipe pushing assembly extends to the position below the supporting table. Compared with the prior art, welding can be conducted on the gaps of the steel pipe in time after the steel pipe is formed, so that the intermediate transfer procedure is omitted, and the forming quality and the forming efficiency of the steel pipe are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of steel pipe production, and particularly relates to a gap closing die for steel pipe production. BACKGROUND

[0002] At present, steel pipes can be divided into seamless steel pipes and welded steel pipes according to production methods, the production of the seamless steel pipes is mostly carried out by pouring and forming through a pouring die, and the production of the welded steel pipes needs to bend a flat steel plate blank into a steel pipe structure with a gap through a bending die, and then weld the gap of the steel pipe through a welding mechanism.

[0003] In the prior art, when the flat steel plate blank is bent into a steel pipe structure with a gap, the steel pipe needs to be transferred to the position of the welding structure by means of a conveying mechanism or a hoisting mechanism, and the steel pipe is affected by various factors (for example, the steel pipe is subjected to collision and the stress of the steel pipe itself) during the transfer, so that the size of the gap of the steel pipe changes, and thus the size of the welded steel pipe cannot meet the requirements. SUMMARY

[0004] In view of the above problems in the prior art, the technical problem to be solved by the embodiments of the present application is to provide a gap closing die for steel pipe production.

[0005] To solve the above technical problems, the present application provides the following technical scheme:

[0006] A gap closing die for steel pipe production, comprising a supporting table, a driving assembly, a vertical pressing assembly, a side pressing assembly, a pipe pushing assembly and a welding gun,

[0007] A semicircular notch is formed in the upper part of the supporting table,

[0008] The vertical pressing assembly is arranged above the semicircular notch and is used to press the flat steel plate into the semicircular notch, so that the flat steel plate forms a U-shaped structure,

[0009] The side pressing assembly is arranged on the side of the semicircular notch and is used to press the U-shaped steel plate, so that the U-shaped steel plate forms a circular steel pipe,

[0010] The welding gun is fixedly arranged on the upper part of the supporting table,

[0011] One end of the pipe pushing assembly extends above the supporting table, and the other end extends below the supporting table,

[0012] The driving assembly is installed at the bottom of the supporting table and is used to drive the pipe pushing assembly to move, so as to push the circular steel pipe and make the gap of the circular steel pipe move relative to the welding gun.

[0013] As a further improvement of the present application: the upper part of the support table is fixedly provided with a second support plate, and vertical guide rails are fixedly arranged on the side wall of the second support plate,

[0014] The vertical pressing assembly comprises a first hydraulic cylinder and a pressing roller,

[0015] The first hydraulic cylinder is fixedly installed on the side wall of the second support plate, the pressing roller is installed at the output end of the first hydraulic cylinder, the pressing roller is arranged above the semicircular notch and is distributed along the length direction of the semicircular notch, a sliding block is fixedly arranged at the end of the pressing roller, and the sliding block is in sliding cooperation with the guide rail.

[0016] As a further improvement of the present application: the side pressing assembly comprises a pressing block and a second hydraulic cylinder,

[0017] The pressing block is provided in two groups, the two groups of pressing blocks are arranged on the upper part of the support table, the two groups of pressing blocks are respectively located on the opposite sides of the semicircular notch, the opposite sides of the two groups of pressing blocks are respectively provided with arc surfaces matched with the outer circular surface of the pressing roller, and the second hydraulic cylinder is provided in a plurality of groups, and the plurality of second hydraulic cylinders are fixedly installed on the upper part of the support table and used to drive the two groups of pressing blocks to move towards each other.

[0018] As a further improvement of the present application: a sliding groove is arranged on the bottom of the semicircular notch along the length direction, a vertical plate is fixedly arranged on the bottom of the support table, a groove is arranged on one end of the semicircular notch on the upper part of the support table, and the width of the groove is greater than the width of the sliding groove,

[0019] The pushing tube assembly comprises a first arc-shaped plate, a second arc-shaped plate and a sliding rod,

[0020] The upper end of the sliding rod extends into the groove, and the lower end of the sliding rod extends from the sliding groove to below the support table, the first arc-shaped plate and the second arc-shaped plate are each provided in two groups, the two groups of second arc-shaped plates are hingedly arranged on the upper end of the sliding rod, the two groups of second arc-shaped plates are connected through a first elastic member, the first elastic member is used to provide elastic tension to the two groups of second arc-shaped plates, and the two groups of first arc-shaped plates are respectively fixedly arranged on the upper end of the two groups of second arc-shaped plates.

[0021] The driving assembly comprises a motor and a lead screw,

[0022] The motor is fixedly installed on the side wall of the vertical plate, one end of the lead screw is connected with the output end of the motor, and the other end of the lead screw penetrates through the sliding rod and is in threaded cooperation with the sliding rod.

[0023] As a further improvement of the present application, the upper part of the support table is fixedly provided with a first support plate, the first support plate is located at the end of the compression roller away from the sliding block, the welding gun is fixedly installed on the inner top wall of the first support plate, and the welding gun is located above the semicircular notch.

[0024] As a further improvement of the present application, a strip-shaped limiting piece is fixedly arranged on the circumferential side wall of the compression roller away from the sliding block, and the strip-shaped limiting piece is distributed along the length direction of the compression roller.

[0025] As a further improvement of the present application, the gap closing die for steel pipe production further comprises an oil supply assembly,

[0026] When the two groups of second arc-shaped plates move along the outer part of the compression roller, the oil supply assembly is used for supplying lubricating oil to the outer wall of the compression roller and the inner wall of the semicircular notch, so as to lubricate the movement of the circular steel pipe.

[0027] As a further improvement of the present application, a through opening is formed in the sliding rod, the two groups of second arc-shaped plates are hollow, a plurality of first through holes are formed in the arc-shaped inner walls of the two groups of second arc-shaped plates, a plurality of second through holes are formed in the arc-shaped outer walls of the two groups of second arc-shaped plates, and a diagonal support plate is fixedly arranged at the bottom of the support table and passes through the through opening from the inside,

[0028] The oil supply assembly comprises a first hose, an oil storage pipe and a piston rod,

[0029] The upper end of the oil storage pipe extends to between the two groups of second arc-shaped plates, and the lower end extends to the inside of the through opening from the top of the sliding rod, the oil storage pipe is fixedly connected with the sliding rod, and the oil storage pipe stores lubricating oil in the inside,

[0030] The first hose is provided in two groups, one end of each group of the first hose is connected with the oil storage pipe, the other end of each group of the first hose is in communication with the inner cavity of one group of the second arc-shaped plate, the upper end of the piston rod extends to the inside of the oil storage pipe from the bottom of the oil storage pipe, and the lower end of the piston rod is in contact with the upper surface of the diagonal support plate.

[0031] As a further improvement of the present application, a ring-shaped stopper is fixedly arranged on the outside of the piston rod,

[0032] The oil supply assembly further comprises a second hose and a second elastic member,

[0033] One end of the second elastic member is connected with the bottom of the oil storage pipe, the other end of the second elastic member is connected with the ring-shaped stopper, the second elastic member is used for providing elastic support for the piston rod, one end of the second hose is in communication with the inside of the oil storage pipe, and the other end of the second hose is connected with an external lubricating oil tank, and the second hose and the inside of the oil storage pipe are both provided with a one-way valve.

[0034] As a further improvement of the present invention: the first elastic element and the second elastic element are springs or metal sheets.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] In this embodiment of the invention, when processing a straight steel plate into a circular steel pipe, the straight steel plate can be placed on the upper part of a support platform, with the semi-circular groove located below the straight steel plate. Then, the vertical pressing component moves down to press the straight steel plate into the semi-circular groove. At this time, the straight steel plate is bent into a U-shaped structure. Then, the side pressing component applies side pressure to the U-shaped steel plate, causing the U-shaped steel plate to bend further, thereby forming a circular steel pipe with a gap. Then, the driving component drives the pushing component to move, and the pushing component pushes the circular steel pipe to move synchronously, so that the gap of the circular steel pipe moves relative to the welding gun. The welding gun is used to weld the gap of the circular steel pipe, thereby completing the closing operation of the circular steel pipe. Compared with the prior art, the gap of the steel pipe can be welded in time after the steel pipe is formed, thereby eliminating the intermediate transfer process and improving the forming quality and forming efficiency of the steel pipe. Attached Figure Description

[0037] Figure 1 A schematic diagram of the structure of a slit-closing mold for steel pipe production. Figure 1 ;

[0038] Figure 2 A schematic diagram of the structure of a slit-closing mold for steel pipe production. Figure 2 ;

[0039] Figure 3 A schematic diagram of the structure of a slit-closing mold for steel pipe production. Figure 3 ;

[0040] Figure 4 for Figure 1 Enlarged view of region A in the middle;

[0041] Figure 5 for Figure 2 Enlarged view of region B in the middle;

[0042] Figure 6 for Figure 2 Enlarged diagram of region C in the middle;

[0043] Figure 7 for Figure 3 Enlarged schematic diagram of region D in the middle;

[0044] In the diagram: 10-Support platform, 101-Semi-circular groove, 102-Upright plate, 103-First support plate, 104-Second support plate, 105-Guide rail, 106-Groove, 107-Slide groove, 108-Diagonal brace, 20-Drive assembly, 201-Motor, 202-Lead screw, 30-Vertical pressure assembly, 301-First hydraulic cylinder, 302-Pressure roller, 303-Slider, 304-Strip-shaped limiting piece, 40-Side pressure assembly. 401-Pressure block, 402-Second hydraulic cylinder, 50-Push tube assembly, 501-First arc plate, 502-Second arc plate, 503-First through hole, 504-Second through hole, 505-First hose, 506-First elastic element, 507-Oil reservoir, 508-Slide rod, 5081-Through port, 509-Second flexible tube, 510-Piston rod, 511-Second elastic element, 512-Annular stop block, 60-Welding torch. Detailed Implementation

[0045] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0046] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0047] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Please see Figure 1 , Figure 2 as well as Figure 3This embodiment provides a gap-closing mold for steel pipe production, including a support platform 10, a drive assembly 20, a vertical pressure assembly 30, a side pressure assembly 40, a tube-pushing assembly 50, and a welding torch 60. The support platform 10 has a semi-circular slot 101 on its upper part. The vertical pressure assembly 30 is disposed above the semi-circular slot 101 and is used to press a straight steel plate into the semi-circular slot 101, so that the straight steel plate forms a U-shaped structure. The side pressure assembly 40 is disposed on the side of the semi-circular slot 101 and is used to side-press the U-shaped steel plate, so that the U-shaped steel plate forms a circular steel pipe. The welding torch 60 is fixedly disposed on the upper part of the support platform 10. One end of the tube-pushing assembly 50 extends above the support platform 10, and the other end extends below the support platform 10. The drive assembly 20 is installed at the bottom of the support platform 10 and is used to drive the tube-pushing assembly 50 to move, thereby pushing the circular steel pipe so that the gap of the circular steel pipe moves relative to the welding torch 60.

[0050] When processing a straight steel plate into a circular steel pipe, the straight steel plate can be placed on the upper part of the support platform 10, so that the semi-circular groove 101 is located below the straight steel plate. Then, the vertical pressing component 30 moves down to press the straight steel plate into the semi-circular groove 101. At this time, the straight steel plate is bent into a U-shaped structure. Then, the side pressing component 40 applies side pressure to the U-shaped steel plate, causing the U-shaped steel plate to bend further, thereby forming a circular steel pipe with a gap. Then, the driving component 20 drives the pusher component 50 to move. The pusher component 50 pushes the circular steel pipe to move synchronously, so that the gap of the circular steel pipe moves relative to the welding torch 60. The welding torch 60 is used to weld the gap of the circular steel pipe, thereby completing the closing operation of the circular steel pipe.

[0051] Please see Figure 1 In one embodiment, a second support plate 104 is fixedly installed on the upper part of the support platform 10, and vertically distributed guide rails 105 are fixedly installed on the side wall of the second support plate 104. The vertical pressing assembly 30 includes a first hydraulic cylinder 301 and a pressure roller 302. The first hydraulic cylinder 301 is fixedly installed on the side wall of the second support plate 104, and the pressure roller 302 is installed at the output end of the first hydraulic cylinder 301. The pressure roller 302 is arranged above the semi-circular groove 101 and distributed along the length direction of the semi-circular groove 101. A slider 303 is fixedly installed at the end of the pressure roller 302, and the slider 303 slides with the guide rail 105.

[0052] After the flat steel plate is placed on the support platform 10 and the semi-circular groove 101 is located below the flat steel plate, the first hydraulic cylinder 301 drives the pressure roller 302 to move down. The pressure roller 302 acts on the upper surface of the flat steel plate, thereby driving the flat steel plate to bend and deform into the semi-circular groove 101. When the pressure roller 302 moves down and enters the semi-circular groove 101, the flat steel plate is pressed into a U-shaped structure.

[0053] Please see Figure 1 In one embodiment, the side pressure assembly 40 includes a pressure block 401 and a second hydraulic cylinder 402. The pressure block 401 is provided in two sets, and the two sets of pressure blocks 401 are disposed on the upper part of the support platform 10. The two sets of pressure blocks 401 are respectively located on opposite sides of the semi-circular groove 101. Each side of the two sets of pressure blocks 401 has an arc-shaped surface adapted to the outer circular surface of the pressure roller 302. The second hydraulic cylinder 402 is provided in several sets, and several second hydraulic cylinders 402 are fixedly installed on the upper part of the support platform 10 for driving the two sets of pressure blocks 401 to move towards each other.

[0054] When the pressure roller 302 presses the flat steel plate into the semi-circular groove 101 to form a U-shaped structure, several second hydraulic cylinders 402 drive two sets of pressure blocks 401 to move towards each other. The arc-shaped surfaces on the side walls of the two sets of pressure blocks 401 act on the two vertical side walls of the U-shaped steel plate, thereby driving the vertical side walls to bend further and fit against the outer circular surface of the pressure roller 302. At this time, the U-shaped steel plate is pressed into a circular steel tube with gaps, and the circular steel tube covers the outside of the pressure roller 302.

[0055] Please see Figure 3 , Figure 4 , Figure 5 as well as Figure 7 In one embodiment, a groove 107 is formed along the length direction at the bottom of the semi-circular slot 101, and a vertical plate 102 is fixedly provided at the bottom of the support platform 10. A groove 106 is formed at one end of the semi-circular slot 101 on the upper part of the support platform 10. The width of the groove 106 is greater than the width of the groove 107. The push tube assembly 50 includes a first arc plate 501, a second arc plate 502, and a slide rod 508. The upper end of the slide rod 508 extends into the groove 106, and the lower end extends from the groove 107 to below the support platform 10. Both the first arc plate 501 and the second arc plate 502 are provided with two... The two sets of second arc-shaped plates 502 are hinged to the upper end of the slide rod 508. The two sets of second arc-shaped plates 502 are connected by a first elastic element 506, which provides elastic tension to the two sets of second arc-shaped plates 502. The two sets of first arc-shaped plates 501 are respectively fixedly installed on the upper end of the two sets of second arc-shaped plates 502. The drive assembly 20 includes a motor 201 and a lead screw 202. The motor 201 is fixedly installed on the side wall of the upright plate 102. One end of the lead screw 202 is connected to the output end of the motor 201, and the other end passes through the slide rod 508 and is threadedly engaged with the slide rod 508.

[0056] When the first hydraulic cylinder 301 drives the pressure roller 302 downward, the pressure roller 302 can act on the outer arc surface of the two sets of first arc plates 501, thereby pushing the two sets of second arc plates 502 to rotate relative to the slide rod 508. At this time, the two sets of second arc plates 502 move away from each other and open up. The first elastic element 506 is stretched by force. As the pressure roller 302 continues to move downward, the pressure roller 302 enters between the two sets of open second arc plates 502. Then, the first elastic element 506 pulls the two sets of second arc plates 502, causing the two sets of second arc plates 502 to rotate in the opposite direction relative to the slide rod 508. At this time, the two sets of second arc plates 502 approach each other and close and clamp the outside of the pressure roller 302. At the same time, the pressure roller 302 presses the flat steel plate into the semi-circular groove 101, so that the flat steel plate forms a U-shaped structure. Then the second hydraulic cylinder 301 moves downward. The pressure cylinder 402 drives the pressure block 401 to move. The arc surface of the pressure block 401 presses the vertical wall of the U-shaped steel plate onto the outer circular surface of the pressure roller 302, thereby forming a circular steel tube from the U-shaped steel plate. Then, the second hydraulic cylinder 402 drives the pressure block 401 to return. The motor 201 drives the lead screw 202 to rotate. When the lead screw 202 rotates, it drives the slide rod 508 to slide along the inside of the slide groove 107 through the threaded engagement with the slide rod 508. At the same time, the slide rod 508 drives the two sets of second arc plates 502 to move along the outside of the pressure roller 302. The two sets of second arc plates 502 enter the semi-circular groove 101 from the inside of the groove 106 and act on one end of the circular steel tube, thereby pushing the circular steel tube to move synchronously along the outside of the pressure roller 302, so as to push the circular steel tube away from the end of the pressure roller 302 away from the slider 303.

[0057] Please see Figure 1 In one embodiment, a first support plate 103 is fixedly disposed on the upper part of the support platform 10. The first support plate 103 is located at the end of the pressure roller 302 away from the slider 303. The welding gun 60 is fixedly installed on the inner top wall of the first support plate 103. The welding gun 60 is located above the semi-circular groove 101.

[0058] When the two sets of second arc plates 502 push the circular steel pipe to move along the outside of the pressure roller 302, the circular steel pipe gradually moves out from the end of the pressure roller 302 away from the slider 303. At this time, the gap of the circular steel pipe moves relative to the welding gun 60. The welding gun 60 is used to weld the gap of the circular steel pipe to achieve automatic closure of the circular steel pipe.

[0059] When the two sets of second arc-shaped plates 502 push the circular steel pipe to move along the outside of the pressure roller 302, the circular steel pipe lacks positioning during movement. Therefore, it easily rotates relative to the pressure roller 302 during the movement, causing the gap to deviate from the welding torch 60. This prevents the welding torch 60 from accurately welding the gap of the circular steel pipe, thus affecting the closure effect of the steel pipe. Based on this, please refer to... Figure 6In one embodiment, a strip-shaped limiting piece 304 is fixedly provided on the circumferential sidewall of the pressure roller 302 away from the slider 303, and the strip-shaped limiting piece 304 is distributed along the length direction of the pressure roller 302.

[0060] After the vertical wall of the U-shaped steel plate is pressed onto the outer circular surface of the pressure roller 302 by the arc surface of the pressure block 401, the strip-shaped limiting piece 304 acts within the gap of the circular steel pipe. When the two sets of second arc plates 502 push the circular steel pipe to move along the outside of the pressure roller 302, the strip-shaped limiting piece 304 moves along the gap of the circular steel pipe to provide guidance and positioning for the movement of the circular steel pipe, thereby preventing the circular steel pipe from rotating and ensuring that the welding torch 60 can accurately weld along the gap of the circular steel pipe.

[0061] After the U-shaped steel plate is pressed into a circular steel pipe, the circular steel pipe is sandwiched outside the pressure roller 302. When passing through, the outer wall of the circular steel pipe contacts the inner wall of the semi-circular groove 101. Therefore, when the two sets of second arc plates 502 push the circular steel pipe, the inner and outer walls of the circular steel pipe are affected by the double friction of the pressure roller 302 and the semi-circular groove 101, resulting in a large resistance to movement of the circular steel pipe. This hinders the movement of the semi-circular steel pipe, thus preventing the welding torch 60 from stably and continuously welding the gap of the circular steel pipe. Based on this, in one embodiment, the gap closing mold for steel pipe production also includes an oil supply component. When the two sets of second arc plates 502 move along the outside of the pressure roller 302, the oil supply component is used to supply lubricating oil to the outer wall of the pressure roller 302 and the inner wall of the semi-circular groove 101 to lubricate the movement of the circular steel pipe. This allows the two sets of second arc plates 502 to smoothly push the circular steel pipe, enabling the welding torch 60 to stably and continuously weld the gap of the circular steel pipe.

[0062] Please see Figure 5 as well as Figure 7In one embodiment, the slide rod 508 has a through-hole 5081, the two sets of second arc-shaped plates 502 are hollow inside, the inner arc-shaped walls of the two sets of second arc-shaped plates 502 have a plurality of first through holes 503, and the outer arc-shaped walls of the two sets of second arc-shaped plates 502 have a plurality of second through holes 504. A diagonal brace 108 is fixedly installed at the bottom of the support platform 10, and the diagonal brace 108 passes through the through-hole 5081. The oil supply assembly includes a first hose 505, an oil storage pipe 507, and a piston rod 510. The upper end of the oil storage pipe 507 extends to... Between the two sets of second arc-shaped plates 502, the lower end extends from the top of the slide rod 508 to the inside of the through-hole 5081. The oil storage pipe 507 is fixedly connected to the slide rod 508. The oil storage pipe 507 stores lubricating oil. There are two sets of first hoses 505. One end of each set of first hoses 505 is connected to the oil storage pipe 507, and the other end is connected to the inner cavity of one set of second arc-shaped plates 502 respectively. The upper end of the piston rod 510 extends from the bottom of the oil storage pipe 507 to the inside of the oil storage pipe 507, and the lower end contacts the upper surface of the inclined support plate 108.

[0063] When the motor 201 drives the lead screw 202 to rotate, thereby causing the slide rod 508 to slide along the inside of the slide groove 107, the oil storage pipe 507 and the piston rod 510 move synchronously. When the piston rod 510 moves, its lower end slides along the upper surface of the inclined support plate 108. The inclined support plate 108 pushes the piston rod 510, causing the piston rod 510 to move into the oil storage pipe 507, thereby pressing the lubricating oil inside the oil storage pipe 507 into the inner cavity of the two sets of second arc-shaped plates 502 through the two sets of first hoses 505 respectively. Then, the lubricating oil is pumped through the first through hole 503 on the arc-shaped inner wall of the two sets of second arc-shaped plates 502 and the second through hole 503 on the arc-shaped outer wall of the two sets of second arc-shaped plates 502. The lubricating oil pressed out through the through hole 504 and through the first through hole 503 acts on the outer wall of the pressure roller 302, and the lubricating oil pressed out through the second through hole 504 acts on the inner wall of the semi-circular groove 101. Thus, oil is supplied to the outer wall of the pressure roller 302 and the inner wall of the semi-circular groove 101. In this way, the oil-supplied outer wall of the pressure roller 302 and the inner wall of the semi-circular groove 101 can be used to lubricate the movement of the circular steel pipe along the outside of the pressure roller 302 and the inside of the semi-circular groove 101 after the flat steel plate is pressed into a circular steel pipe. This allows the gap of the circular steel pipe to move smoothly relative to the welding gun 60, and achieves accurate welding closure of the gap of the circular steel pipe.

[0064] Please see Figure 7In one embodiment, an annular stop 512 is fixedly provided on the outside of the piston rod 510. The oil supply assembly also includes a second hose 509 and a second elastic element 511. One end of the second elastic element 511 is connected to the bottom of the oil reservoir 507, and the other end is connected to the annular stop 512, which is used to provide elastic support for the piston rod 510. One end of the second hose 509 is connected to the inside of the oil reservoir 507, and the other end is connected to an external lubricating oil tank (not shown in the figure). Both the second hose 509 and the oil reservoir 507 are provided with a one-way valve (not shown in the figure).

[0065] When the lower end of the piston rod 510 slides along the upper surface of the inclined support plate 108 and moves into the oil storage pipe 507, the second elastic element 511 is compressed, the one-way valve inside the oil storage pipe 507 opens, and the one-way valve inside the second hose 509 closes. The piston rod 510 presses the lubricating oil inside the oil storage pipe 507 into the inner cavity of the two sets of second arc plates 502 through the two sets of first hoses 505, realizing the oil supply operation of the outer wall of the pressure roller 302 and the inner wall of the semi-circular groove 101. When the two sets of second arc plates 502 push the circular steel pipe away from the outside of the pressure roller 302, and the welding gun 60 finishes welding the gap of the circular steel pipe, the motor 201 drives the lead screw 202 to rotate in the opposite direction, thereby driving the slide rod 508 to slide in the opposite direction along the inside of the slide groove 107. The slide rod 508 drives the two sets of second arc plates 502, the oil storage pipe 507 and the piston rod 510 to move in the opposite direction synchronously. When the piston rod 510 moves, its lower end slides in the opposite direction along the upper surface of the inclined support plate 108. The second elastic element 511 pushes the piston rod 510, causing it to move downward relative to the oil storage pipe 507. At this time, the one-way valve inside the oil storage pipe 507 is closed, and the one-way valve inside the second hose 509 is opened. The piston rod 510 draws the lubricating oil from the external lubricating oil tank into the oil storage pipe 507 through the second hose 509, thus achieving automatic replenishment of lubricating oil. When the two sets of second arc-shaped plates 502 move in opposite directions into the groove 106, the first hydraulic cylinder 301 drives the pressure roller 302 to move upward. The pressure roller 302 drives the two sets of second arc-shaped plates 502 to move away from each other again until the pressure roller 302 moves out from the inside of the two sets of second arc-shaped plates 502. Then, the first elastic element 506 pulls the two sets of second arc-shaped plates 502 again, causing them to move closer to each other again.

[0066] In one embodiment, the first elastic element 506 and the second elastic element 511 can be springs or metal sheets, and there is no limitation here.

[0067] In this embodiment of the invention, when processing a straight steel plate into a circular steel pipe, the straight steel plate can be placed on the upper part of the support platform 10, so that the semi-circular groove 101 is located below the straight steel plate. Then, the vertical pressing component 30 moves down to press the straight steel plate into the semi-circular groove 101. At this time, the straight steel plate is bent into a U-shaped structure. Then, the side pressing component 40 applies side pressure to the U-shaped steel plate, causing the U-shaped steel plate to bend further, thereby forming a circular steel pipe with a gap. Then, the driving component 20 drives the pusher component 50 to move. The pusher component 50 pushes the circular steel pipe to move synchronously, so that the gap of the circular steel pipe moves relative to the welding gun 60. The welding gun 60 is used to weld the gap of the circular steel pipe, thereby completing the closing operation of the circular steel pipe. Compared with the prior art, the gap of the steel pipe can be welded in time after the steel pipe is formed, thereby eliminating the intermediate transfer process and improving the forming quality and forming efficiency of the steel pipe.

[0068] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A slit-closing mold for steel pipe production, characterized in that, It includes a support platform (10), a drive assembly (20), a vertical pressure assembly (30), a side pressure assembly (40), a push tube assembly (50), and a welding torch (60). The upper part of the support platform (10) is provided with a semi-circular groove (101). The vertical pressing component (30) is disposed above the semi-circular slot (101) and is used to press the straight steel plate into the semi-circular slot (101) so that the straight steel plate forms a U-shaped structure. The side-pressing component (40) is located on the side of the semi-circular slot (101) and is used to apply side pressure to the U-shaped steel plate, so that the U-shaped steel plate forms a circular steel tube. The welding torch (60) is fixedly mounted on the upper part of the support platform (10). One end of the push tube assembly (50) extends above the support platform (10), and the other end extends below the support platform (10). The drive assembly (20) is installed at the bottom of the support platform (10) to drive the pusher assembly (50) to move, thereby pushing the circular steel pipe so that the gap of the circular steel pipe moves relative to the welding torch (60).

2. The slit closing mold for steel pipe production according to claim 1, characterized in that, The support platform (10) is fixedly provided with a second support plate (104) on its upper part, and vertically distributed guide rails (105) are fixedly provided on the side wall of the second support plate (104). The vertical pressure assembly (30) includes a first hydraulic cylinder (301) and a pressure roller (302). The first hydraulic cylinder (301) is fixedly installed on the side wall of the second support plate (104). The pressure roller (302) is installed at the output end of the first hydraulic cylinder (301). The pressure roller (302) is arranged above the semi-circular groove (101) and distributed along the length direction of the semi-circular groove (101). A slider (303) is fixedly provided at the end of the pressure roller (302). The slider (303) slides with the guide rail (105).

3. The slit closing mold for steel pipe production according to claim 2, characterized in that, The side pressure assembly (40) includes a pressure block (401) and a second hydraulic cylinder (402). The pressure block (401) is provided in two sets. The two sets of pressure blocks (401) are set on the upper part of the support platform (10). The two sets of pressure blocks (401) are respectively located on opposite sides of the semi-circular groove (101). The opposite side of the two sets of pressure blocks (401) is provided with an arc-shaped surface that matches the outer circle surface of the pressure roller (302). The second hydraulic cylinder (402) is provided in several sets. Several second hydraulic cylinders (402) are fixedly installed on the upper part of the support platform (10) to drive the two sets of pressure blocks (401) to move towards each other.

4. A slit-closing mold for steel pipe production according to claim 2, characterized in that, The bottom of the semi-circular slot (101) is provided with a sliding groove (107) along its length. The bottom of the support platform (10) is fixedly provided with a vertical plate (102). The upper part of the support platform (10) is provided with a groove (106) at one end of the semi-circular slot (101). The width of the groove (106) is greater than the width of the sliding groove (107). The push tube assembly (50) includes a first arc plate (501), a second arc plate (502), and a slide rod (508). The upper end of the slide rod (508) extends into the groove (106), and the lower end extends from the slide groove (107) to below the support platform (10). Two sets of the first arc-shaped plate (501) and the second arc-shaped plate (502) are provided. The two sets of the second arc-shaped plates (502) are hinged to the upper end of the slide rod (508). The two sets of the second arc-shaped plates (502) are connected by a first elastic element (506), which provides elastic tension to the two sets of the second arc-shaped plates (502). The two sets of the first arc-shaped plates (501) are respectively fixedly installed on the upper ends of the two sets of the second arc-shaped plates (502). The drive assembly (20) includes a motor (201) and a lead screw (202). The motor (201) is fixedly installed on the side wall of the upright plate (102). One end of the lead screw (202) is connected to the output end of the motor (201), and the other end passes through the slide rod (508) and is threadedly engaged with the slide rod (508).

5. A slit closing mold for steel pipe production according to claim 2, characterized in that, The support platform (10) is fixedly provided with a first support plate (103) on the upper part. The first support plate (103) is located at the end of the pressure roller (302) away from the slider (303). The welding gun (60) is fixedly installed on the inner top wall of the first support plate (103). The welding gun (60) is located above the semi-circular groove (101).

6. A slit closing mold for steel pipe production according to claim 2, characterized in that, A strip-shaped limiting piece (304) is fixedly provided on the circumferential side wall of the pressure roller (302) away from the slider (303), and the strip-shaped limiting piece (304) is distributed along the length direction of the pressure roller (302).

7. A slit closing mold for steel pipe production according to claim 4, characterized in that, The slit-closing mold for steel pipe production also includes an oil supply component. As the two sets of second arc plates (502) move along the outside of the pressure roller (302), the oil supply assembly supplies lubricating oil to the outer wall of the pressure roller (302) and the inner wall of the semi-circular groove (101) to lubricate the movement of the circular steel pipe.

8. A slit closing mold for steel pipe production according to claim 7, characterized in that, The slide bar (508) has an opening (5081), the two sets of second arc-shaped plates (502) are hollow inside, the inner arc-shaped walls of the two sets of second arc-shaped plates (502) have several first through holes (503), and the outer arc-shaped walls of the two sets of second arc-shaped plates (502) have several second through holes (504). The bottom of the support platform (10) is fixedly provided with a diagonal brace (108), which passes through the opening (5081). The oil supply assembly includes a first hose (505), an oil reservoir (507), and a piston rod (510). The upper end of the oil storage pipe (507) extends between the two sets of the second arc-shaped plates (502), and the lower end extends from the top of the slide rod (508) into the interior of the through-hole (5081). The oil storage pipe (507) is fixedly connected to the slide rod (508), and the oil storage pipe (507) stores lubricating oil inside. The first hose (505) is provided in two sets. One end of the two sets of first hoses (505) is connected to the oil storage pipe (507), and the other end is connected to the inner cavity of the second arc plate (502) respectively. The upper end of the piston rod (510) extends from the bottom of the oil storage pipe (507) to the inside of the oil storage pipe (507), and the lower end contacts the upper surface of the inclined support plate (108).

9. A slit closing mold for steel pipe production according to claim 8, characterized in that, An annular stop (512) is fixedly installed on the outside of the piston rod (510). The oil supply assembly also includes a second hose (509) and a second elastic element (511). One end of the second elastic element (511) is connected to the bottom of the oil storage pipe (507), and the other end is connected to the annular stop block (512) to provide elastic support for the piston rod (510). One end of the second hose (509) is connected to the inside of the oil storage pipe (507), and the other end is connected to the external lubricating oil tank. Both the second hose (509) and the inside of the oil storage pipe (507) are equipped with one-way valves.

10. A slit-closing mold for steel pipe production according to claim 9, characterized in that, The first elastic element (506) and the second elastic element (511) are springs or metal sheets.

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