Inner scar scraping device for longitudinal welded pipe

Abstract

The inner scar scraping device is characterized in that at least one side guide wheel is arranged on each of two sides of a lower guide wheel, an angle is formed between each side guide wheel and the lower guide wheel, a hydraulic cavity is formed in a tool apron, the lower guide wheel and each side guide wheel respectively correspond to a piston, one end of each piston is rotatably provided with the lower guide wheel or the side guide wheel, and the other end of each piston is rotatably provided with the hydraulic cavity; the other end of the piston is slidably connected into the hydraulic cavity, and medium pressure in the hydraulic cavity can push the piston to slide. According to the inner scar scraping device for the longitudinal welded pipe, the peripheries of the upper guide wheel, the lower guide wheel and the side guide wheels are all connected to the inner wall of the welded pipe in a rolling mode, a linear welding seam is located in an avoiding annular groove of the upper guide wheel, so that a cutter can scrape the welding scar under the condition that the upper guide wheel does not make contact with the welding scar, and the upper guide wheel and the lower guide wheel which are symmetrically arranged are axially symmetrical; the distance between the tail ends of the upper guide wheel and the lower guide wheel is equal to the inner diameter of the straight seam steel pipe, and the tool aprons of the upper guide wheel and the lower guide wheel can be prevented from moving in the straight seam steel pipe by arranging the side guide wheels so as to position the relative position of the tool.

Description

Technical Field

[0001] The present invention belongs to the field of production of straight seam welded pipes, and in particular relates to an inner scar scraping device for straight seam welded pipes. Background Art

[0002] During the high-frequency welding process of welded steel pipes, under the action of high-frequency induction, the temperature at the weld will rise instantaneously. The strip edges at the weld reach the solid solution state and then form steel pipes through extrusion and fusion. However, during the extrusion process, pointed burrs are generated inside and outside the weld. The outer burrs and inner burrs of the pipe need to be removed by an outer scar scraping knife and an inner scar scraping knife respectively. The existing inner scar scraping knife seat mainly fixes the relative position of the knife seat inside the welded pipe through an upper guide wheel and a lower guide wheel. When the roundness of the welded pipe is poor and there are residual welding beads and protrusions inside the welded pipe, it will drive the upper guide wheel and the lower guide wheel to move left and right, resulting in the tool deviating from the weld, affecting the scar scraping quality. Moreover, a hydraulic cylinder is provided in the positioning mechanism of the lower guide wheel. A sealing rubber ring is provided on the piston of the hydraulic cylinder. During continuous production, due to the high temperature generated by the high temperature at the weld and the high pressure of the hydraulic cylinder itself, the sealing rubber ring will age rapidly and is extremely easy to damage, resulting in insufficient pressure of the feed hydraulic cylinder. Summary of the Invention

[0003] In view of this, the present invention aims to provide an inner scar scraping device for straight seam welded pipes to solve the problem that when scraping the inner scar of a straight seam welded pipe in the prior art, the inner scar scraping knife seat is only positioned by an upper guide wheel and a lower guide wheel, and the left and right movement of the knife seat cannot be limited, affecting the production quality.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows:

[0005] An inner scar scraping device for straight seam welded pipes includes a knife seat. An upper guide wheel is installed on the upper side of the knife seat, and a lower guide wheel is installed on the lower side of the knife seat. The upper guide wheel and the lower guide wheel are arranged oppositely. A plurality of side guide wheels are arranged around the knife seat, and at least one side guide wheel is arranged on each side of the lower guide wheel. An angle is provided between each side guide wheel and the lower guide wheel. A hydraulic cavity is provided inside the knife seat, and a piston corresponds to the lower guide wheel and each side guide wheel respectively. One end of the piston is rotatably installed with the lower guide wheel or the side guide wheel, and the other end of the piston is slidably connected to the hydraulic cavity. The medium pressure in the hydraulic cavity can push the piston to slide.

[0006] Further, a connecting pipe is installed at one end of the knife seat, and a tool is installed at the other end of the knife seat. A water spray nozzle is provided on the knife seat, and the water spray nozzle faces the tool. One end of the connecting pipe is connected to a water source. A first flow channel, a second flow channel and a third flow channel are provided inside the connecting pipe. A water spray flow channel, a liquid inlet flow channel and a liquid outlet flow channel are respectively provided on the knife seat. The first flow channel is connected to the water spray nozzle through the water spray flow channel, the second flow channel is connected to the inlet end of the hydraulic cavity through the liquid inlet flow channel, and the outlet end of the hydraulic cavity is connected to the third flow channel through the liquid outlet flow channel.

[0007] Further, the end of the tool holder away from the tool is a frustum structure. An avoidance groove is provided on the upper side of the tool holder, an avoidance ring groove is provided on the periphery of the upper guide wheel, and the bottom surface of the avoidance groove is lower than the bottom surface of the avoidance ring groove.

[0008] Further, one side guide wheel is respectively arranged on both sides of the lower guide wheel, and the two side guide wheels are arranged oppositely. The two ends of each side guide wheel and the lower guide wheel are respectively rotatably connected to a mounting seat. An installation groove is provided on the tool holder, and the periphery of the mounting seat is slidably connected into the installation groove. One end of the mounting seat is fixedly connected to one end of the piston;

[0009] Further, a sliding groove is provided on the tool holder, and the side wall of each installation groove is correspondingly provided with a sliding groove. A first sliding table is installed on the outer wall of the mounting seat, and the first sliding table is slidably connected into the sliding groove.

[0010] Further, an end cover is detachably installed on the installation groove, and the lower end of the mounting seat can abut against the upper end of the end cover. A compression spring is arranged at the lower end of the first sliding table, and the lower end of the compression spring abuts against the upper end of the end cover.

[0011] Further, the periphery of each piston is slidably connected into a sliding hole, and a plurality of sliding holes communicate with each other to form a hydraulic cavity. A sealing ring is arranged between the periphery of the piston and the sliding hole.

[0012] Further, one end of the piston is fixedly connected to one end of the mounting seat. A blind hole is provided at the other end of the piston. The outlet end of the liquid inlet flow channel is arranged at the end of the sliding hole away from the mounting seat. The inlet end of the liquid outlet flow channel is located on the side wall of the sliding hole. A first long hole is axially arranged on the side wall of the piston, and the inside of the blind hole communicates with the liquid outlet flow channel through the first long hole.

[0013] Further, an induction rod is arranged on the periphery of the connecting pipe. One section of the connecting pipe is installed with a connecting seat, and the other end of the connecting pipe is installed with a tool holder. The connecting seat includes a first support plate and a second support plate. The first support plate is fixedly installed on an external machine table. A second long hole is provided on the first support plate. A third long hole is provided on the second support plate, and the second long hole and the third long hole are arranged perpendicular to each other. An arc-shaped hole is provided on the first support plate, and the arc-shaped hole is located below the second long hole. Locking bolts are respectively installed in the first long hole and the arc-shaped hole, and the periphery of the locking bolt can be detachably connected into the third long hole. One end of the second support plate is detachably connected to the periphery of the connecting pipe.

[0014] Further, a wrench is arranged on the periphery of the connecting pipe. The wrench can slide on the periphery of the connecting pipe. A first convex platform is arranged on the periphery of the connecting pipe. A first clamping groove is provided on the inner circle of one end of the wrench, and the periphery of the convex platform can be slidably clamped in the first clamping groove.

[0015] Further, the tool is mounted on the tool holder through a fixing component, and the fixing component includes a positioning base. The tool is a hollow cylindrical structure. A limiting hole is provided at one end of the tool holder. The outer periphery of the positioning base is slidably connected into the limiting hole. The outer periphery of the tool is located within the limiting hole, and the lower end of the tool abuts against the upper end of the positioning base;

[0016] Further, an adaptation groove is provided at the upper end of the positioning base. The lower end of the tool is mounted in the adaptation groove. A positioning slide is provided on the outer periphery of the positioning base, and a positioning chute is provided on the side wall of the limiting hole. The outer periphery of the positioning slide is slidably connected into the positioning chute;

[0017] Further, a guiding hole is provided in the middle of the positioning base, and the cross-section of the guiding hole is a trapezoidal structure. The inner diameter of the guiding hole near the tool is the same as the inner diameter of the tool, and the inner diameter of the other end of the guiding hole is smaller than the inner diameter of the tool.

[0018] Further, an internal thread is provided on the inner ring at the end of the limiting hole away from the tool. The outer periphery of the top pin is threadedly connected into the limiting hole, and one end of the top pin abuts against one end of the positioning base. A first through hole is provided in the middle of the top pin, and the first through hole is communicated with the guiding hole.

[0019] Further, the fixing component further includes a pressing plate. A pressing groove is provided on the tool holder. The pressing plate is detachably mounted in the pressing groove, and an arc-shaped cut is provided at one end of the pressing plate. The outer edge of the upper end of the tool abuts against the pressing groove.

[0020] Further, the internal scarring device of the straight seam welded pipe further includes a pressure maintaining component. The outlet end of the third flow channel is connected to the inlet end of the pressure maintaining component through a connecting pipe. The outlet end of the pressure maintaining component is open to the air or externally connected to a device. The pressure maintaining component includes a front sleeve and a rear sleeve. One end of the front sleeve is fixedly connected to one end of the rear sleeve. A feed pipe is provided at the other end of the front sleeve, and a discharge pipe is provided at the other end of the rear sleeve. A blocking plug is provided at the outlet end of the feed pipe. A sliding rod is mounted at one end of the blocking plug, and the sliding rod and the blocking plug are arranged inside the front sleeve. A third support plate is provided inside the front sleeve. A second through hole is provided in the middle of the third support plate. The outer periphery of the sliding rod is slidably connected into the second through hole. A pull bolt is provided at each end of the third support plate. A third through hole is provided on the front sleeve. The outer periphery of each pull bolt is located in a third through hole. A positioning nut is provided on the outer periphery of the pull bolt. The positioning nut is used to fix the relative positions of the pull bolt, the third support plate and the front sleeve, and the positioning nut is located outside the front sleeve. A compression spring is provided on the outer periphery of the sliding rod, and the two ends of the compression spring respectively abut against one end of the blocking plug and one end of the third support plate.

[0021] Compared with the prior art, the internal scarring device of the straight seam welded pipe of the present invention has the following beneficial effects:

[0022] (1)For the inner scar scraping device of the straight seam welded pipe described in the present invention, the peripheries of the upper guide wheel, the lower guide wheel, and the side guide wheel are all rollingly connected to the inner wall of the welded pipe. The straight weld seam is located in the avoidance ring groove of the upper guide wheel, so that the tool can scrape the weld scar without the upper guide wheel contacting the weld scar. The symmetrically arranged upper guide wheel and lower guide wheel are axially symmetric, and the end distance between the upper guide wheel and the lower guide wheel is the same as the inner diameter of the straight seam steel pipe. By setting the side guide wheel, it is possible to prevent the tool holders of the upper guide wheel and the lower guide wheel from moving within the straight seam steel pipe, so as to position the relative position of the tool. The side guide wheel and the lower guide wheel are co-pressed through the hydraulic cavity. When the end of the side guide wheel or the lower guide wheel presses on protrusions such as weld beads, the side guide wheel or the lower guide wheel can retract, forming an avoidance structure for the hard protrusions, so as to avoid scratching the welded pipe caused by hard contact and improve the service life of the side guide wheel or the lower guide wheel. When the side guide wheel or the lower guide wheel retracts and avoids, the other side guide wheels or lower guide wheels connected to the hydraulic cavity can press against the inner wall of the welded pipe without interference, without affecting the positioning of the tool holder.

[0023] (2)For the inner scar scraping device of the straight seam welded pipe described in the present invention, the water source is connected to the water spray nozzle through the first flow channel and the water spray flow channel, and then sprays onto the tool to cool the tool head, preventing the tool from overheating during the scar scraping operation and reducing the service life. The water source flows into the hydraulic cavity through the second flow channel and the liquid inlet flow channel to maintain the pressure of the hydraulic cavity, which is used to push out the lower guide wheel and the side guide wheel through the piston. The water in the hydraulic cavity flows out through the liquid outlet flow channel and the third flow channel, realizing the water circulation under the pressure maintaining state in the hydraulic cavity, so as to cool the tool holder and the piston, ensure the working condition of the piston, and improve the service life of the piston.

[0024] (3)For the inner scar scraping device of the straight seam welded pipe described in the present invention, the bottom surface of the avoidance groove is lower than the bottom surface of the avoidance ring groove, and the straight seam weld scar of the welded pipe will be lower than the inner wall of the pipe body. By setting the avoidance groove and the frustum structure, the weld scar can be avoided, preventing the weld scar from rubbing against the tool holder and causing irregular movement of the tool holder.

[0025] (4)For the inner scar scraping device of the straight seam welded pipe described in the present invention, a sealing ring is arranged between the periphery of the piston and the sliding hole. The sealing ring is used to ensure the seal between the periphery of the piston and the sliding hole. In order to prevent the sealing ring from being damaged by heat, a blind hole is provided at one end of the piston, and the pressure maintaining water body can flow through the blind hole to cool the piston wall and improve the service life of the sealing ring. A first long hole is provided on the side wall of the piston, which can ensure that when the piston slides in the sliding hole, the blind hole can still be connected to the inlet end of the liquid outlet flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0027] Figure 1Schematic diagram of the structure of the internal scarring device for the straight seam welded pipe according to the embodiment of the present invention;

[0028] Figure 2 Bottom view schematic diagram of the side guide wheel and the lower guide wheel installed on the tool holder according to the embodiment of the present invention;

[0029] Figure 3 Side view schematic diagram of the upper guide wheel, the side guide wheel and the lower guide wheel installed on the tool holder according to the embodiment of the present invention;

[0030] Figure 4 Front view schematic diagram of the upper guide wheel, the side guide wheel and the lower guide wheel installed on the tool holder according to the embodiment of the present invention;

[0031] Figure 5 First perspective structure schematic diagram of the upper guide wheel, the side guide wheel and the lower guide wheel installed on the tool holder according to the embodiment of the present invention;

[0032] Figure 6 Second perspective structure schematic diagram of the upper guide wheel, the side guide wheel and the lower guide wheel installed on the tool holder according to the embodiment of the present invention;

[0033] Figure 7 Schematic diagram of the structure of the connecting seat according to the embodiment of the present invention;

[0034] Figure 8 Schematic diagram of the structure of the mounting seat according to the embodiment of the present invention;

[0035] Figure 9 Cross-sectional schematic diagram of the mounting seat installed on the tool holder according to the embodiment of the present invention;

[0036] Figure 10 Schematic diagram of the structure of the mounting groove on the tool holder according to the embodiment of the present invention;

[0037] Figure 11 Cross-sectional schematic diagram of the fixing component on the tool holder according to the embodiment of the present invention;

[0038] Figure 12 Schematic diagram of the structure of the limiting hole on the tool holder according to the embodiment of the present invention;

[0039] Figure 13 Schematic diagram of the structure of the tool adapted to the positioning base according to the embodiment of the present invention;

[0040] Figure 14 Exploded structure schematic diagram of the fixing component on the tool holder according to the embodiment of the present invention;

[0041] Figure 15 Schematic diagram of the structure of the pressure maintaining component according to the embodiment of the present invention;

[0042] Figure 16Schematic cross-sectional view of the pressure-holding assembly according to an embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 1 - tool holder; 11 - upper guide wheel; 12 - lower guide wheel; 13 - side guide wheel; 14 - piston; 141 - sealing ring; 142 - blind hole; 143 - first long hole; 15 - water spray nozzle; 16 - water spray channel; 17 - liquid inlet channel; 18 - liquid outlet channel; 19 - avoidance groove; 110 - mounting groove; 111 - sliding hole; 112 - first boss; 113 - crimping groove; 114 - limiting hole; 2 - connecting pipe; 3 - tool; 4 - mounting seat; 41 - first sliding table; 42 - end cover; 43 - compression spring; 5 - induction rod; 6 - connecting seat; 61 - first support plate; 62 - second support plate; 63 - second long hole; 64 - third long hole; 65 - arc-shaped hole; 66 - locking bolt; 67 - wrench; 7 - fixing assembly; 71 - positioning base; 72 - fitting groove; 73 - positioning sliding table; 74 - guiding hole; 75 - top pin; 76 - crimping plate; 8 - pressure-holding assembly; 81 - front sleeve; 82 - rear sleeve; 83 - feed pipe; 84 - discharge pipe; 85 - plug; 86 - sliding rod; 87 - third support plate; 88 - pull bolt; 89 - compression spring. Detailed implementation manners

[0045] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0047] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0048] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0049] As Figures 1 - 16 shown, the inner scarring device of the straight seam welded pipe includes a tool holder 1. An upper guide wheel 11 is installed on the upper side of the tool holder 1, and a lower guide wheel 12 is installed on the lower side of the tool holder 1. The upper guide wheel 11 and the lower guide wheel 12 are arranged oppositely. A plurality of side guide wheels 13 are arranged around the tool holder 1, and at least one side guide wheel 13 is arranged on each side of the lower guide wheel 12. An angle is provided between each side guide wheel 13 and the lower guide wheel 12. A hydraulic cavity is provided inside the tool holder 1, and a piston 14 corresponds to the lower guide wheel 12 and each side guide wheel 13 respectively. One end of the piston 14 is rotatably installed on the lower guide wheel 12 or the side guide wheel 13, and the other end of the piston 14 is slidably connected to the hydraulic cavity. The pressure of the medium in the hydraulic cavity can push the piston 14 to slide. The outer peripheries of the upper guide wheel 11, the lower guide wheel 12, and the side guide wheels 13 are all rollingly connected to the inner wall of the welded pipe. The straight weld seam is located in the avoidance ring groove of the upper guide wheel 11, so that the tool 3 can scrape the weld scar without the upper guide wheel 11 contacting the weld scar. The symmetrically arranged upper guide wheel 11 and lower guide wheel 12 are axially symmetric, and the end distance between the upper guide wheel 11 and the lower guide wheel 12 is the same as the inner diameter of the straight seam steel pipe. By providing the side guide wheels 13, it is possible to prevent the tool holder 1 of the upper guide wheel 11 and the lower guide wheel 12 from moving around in the straight seam steel pipe, so as to locate the relative position of the tool 3. The side guide wheels 13 and the lower guide wheel 12 are co-pressed by the hydraulic cavity. When the end of the side guide wheel 13 or the lower guide wheel 12 presses on a convex object such as a weld tumor, the side guide wheel 13 or the lower guide wheel 12 can retract, forming an avoidance structure for the hard convexity, so as to avoid scratching the welded pipe caused by hard contact and improve the service life of the side guide wheel 13 or the lower guide wheel 12. When the side guide wheel 13 or the lower guide wheel 12 retracts and avoids, the other side guide wheels 13 or lower guide wheels 12 connected to the hydraulic cavity can press against the inner wall of the welded pipe without interference, without affecting the positioning of the tool holder 1.

[0050] One end of the tool holder 1 is installed with a connecting pipe 2, and the other end of the tool holder 1 is installed with a tool 3. A water spray nozzle 15 is provided on the tool holder 1, and the water spray nozzle 15 faces the tool 3. One end of the connecting pipe 2 is connected to a water source. The connecting pipe 2 is provided with a first flow channel, a second flow channel and a third flow channel. The tool holder 1 is respectively provided with a water spray flow channel 16, a liquid inlet flow channel 17 and a liquid outlet flow channel 18. The first flow channel is communicated to the water spray nozzle 15 through the water spray flow channel 16. The second flow channel is communicated to the inlet end of the hydraulic chamber through the liquid inlet flow channel 17. The outlet end of the hydraulic chamber is communicated to the third flow channel through the liquid outlet flow channel 18. The water source is connected to the connecting pipe 2 through a pressurization pumping station of the prior art. The water source is communicated to the water spray nozzle 15 through the first flow channel and the water spray flow channel 16, and then sprayed onto the tool 3 to cool the head of the tool 3, preventing the tool 3 from overheating during the scarring operation and reducing the service life. The water source flows into the hydraulic chamber through the second flow channel and the liquid inlet flow channel 17 to maintain pressure in the hydraulic chamber, which is used to eject the lower guide wheel 12 and the side guide wheel 13 through the piston 14. The water body in the hydraulic chamber flows out through the liquid outlet flow channel 18 and the third flow channel, realizing the water circulation under the pressure-maintaining state in the hydraulic chamber, so as to cool the tool holder 1 and the piston 14, ensure the working conditions of the piston 14, and improve the service life of the piston 14.

[0051] One end of the tool holder 1 away from the tool 3 is a frustum structure. An avoidance groove 19 is provided on the upper side of the tool holder 1. An avoidance ring groove is provided on the periphery of the upper guide wheel 11. The bottom surface of the avoidance groove 19 is lower than the bottom surface of the avoidance ring groove. The straight seam weld scar of the welded pipe will be lower than the inner wall of the pipe body. By providing the avoidance groove 19 and the frustum structure, the weld scar can be avoided, preventing the weld scar from rubbing against the tool holder 1, so as to avoid irregular movement of the tool holder 1.

[0052] As Figure 2 As shown, a side guide wheel 13 is respectively arranged on both sides of the lower guide wheel 12, and the two side guide wheels 13 are arranged oppositely. Both ends of each side guide wheel 13 and the lower guide wheel 12 are respectively rotatably connected to a mounting seat 4. An installation groove 110 is provided on the tool holder 1. The periphery of the mounting seat 4 is slidably connected to the installation groove 110. One end of the mounting seat 4 is fixedly connected to one end of the piston 14. A sliding groove is provided on the tool holder 1, and sliding grooves are respectively provided on the side walls of each installation groove 110. A first sliding table 41 is installed on the outer wall of the mounting seat 4, and the first sliding table 41 is slidably connected to the sliding groove. Through the cooperation of the first sliding table 41 and the sliding groove, the sliding track of the mounting seat 4 in the installation groove 110 can be limited, so as to eject the lower guide wheel 12 or the side guide wheel 13 and abut against the inner wall of the welded pipe when the piston 14 is pressurized.

[0053] As Figure 8As shown, an end cover 42 is detachably installed on the installation groove 110, and the lower end of the installation base 4 can abut against the upper end of the end cover 42. A compression spring 43 is arranged at the lower end of the first sliding table 41, and the lower end of the compression spring 43 abuts against the upper end of the end cover 42. The end cover 42 is arranged on the tool holder 1. An exposure hole for the guide wheel to protrude is arranged in the middle of the end cover 42. The end cover 42 can also be used to limit the extreme position of the installation base 4 to prevent the installation base 4 from slipping out of the installation groove 110. In this embodiment, the periphery of each piston 14 is slidably connected to a sliding hole 111, and a plurality of sliding holes 111 communicate with each other to form a hydraulic cavity. A sealing ring 141 is arranged between the periphery of the piston 14 and the sliding hole 111. The sealing ring 141 is used to ensure the seal between the periphery of the piston 14 and the sliding hole 111. And in order to prevent the sealing ring 141 from being damaged by heat, such as Figure 9 As shown, one end of the piston 14 is fixedly connected to one end of the installation base 4. A blind hole 142 is arranged at the other end of the piston 14. The outlet end of the liquid inlet channel 17 is arranged at the end of the sliding hole 111 away from the installation base 4. The inlet end of the liquid outlet channel 18 is located on the side wall of the sliding hole 111. A first long hole 143 is arranged along the axial direction on the side wall of the piston 14. The inside of the blind hole 142 communicates with the liquid outlet channel 18 through the first long hole 143. The water body for pressure maintaining can flow in the blind hole 142 to cool the wall of the piston 14 and improve the service life of the sealing ring 141. And arranging the first long hole 143 on the side wall of the piston 14 can ensure that when the piston 14 slides in the sliding hole 111, the blind hole 142 can still communicate with the inlet end of the liquid outlet channel 18.

[0054] In order to realize the high-frequency welding of the welded pipe, an induction rod 5 is arranged on the periphery of the connecting pipe 2. The induction rod 5 is a carbon rod or other materials that can induce current in the prior art. The high-frequency welding of the welded pipe is the prior art and will not be elaborated here. Such as Figure 1 and Figure 7As shown, one end of the connecting pipe 2 is installed with a connecting seat 6, and the other end of the connecting pipe 2 is installed with a tool holder 1. The connecting seat 6 includes a first support plate 61 and a second support plate 62. The first support plate 61 is fixedly installed on the external machine platform. A second long hole 63 is provided on the first support plate 61, and a third long hole 64 is provided on the second support plate 62. The second long hole 63 and the third long hole 64 are arranged perpendicular to each other. An arc-shaped hole 65 is provided on the first support plate 61, and the arc-shaped hole 65 is located below the second long hole 63. Locking bolts 66 are respectively installed in the first long hole 143 and the arc-shaped hole 65, and the periphery of the locking bolt 66 can be detachably connected to the third long hole 64. One end of the second support plate 62 is detachably connected to the periphery of the connecting pipe 2. By sliding the locking bolt 66 in the third long hole 64, the relative height between the first support plate 61 and the second support plate 62 can be adjusted. By adjusting the position of the locking bolt 66 in the second long hole 63, the relative left-right position between the second support plate 62 and the first support plate 61 can be adjusted. By adjusting the locking bolt 66 located in the arc-shaped hole 65, the swing angle between the first support plate 61 and the second support plate 62 can be adjusted. The adjustment of the relative positions of the above-mentioned first support plate 61 and second support plate 62 can be reflected in the adjustment of the relative position of the tool holder 1 in the welded pipe, so that the tool 3 on the tool holder 1 can meet various working conditions and is convenient to adjust. At the same time, a wrench 67 is arranged on the periphery of the connecting pipe 2, and the wrench 67 can slide on the periphery of the connecting pipe 2. A first boss 112 is arranged on the periphery of the connecting pipe 2. A first card slot is provided on the inner ring of one end of the wrench 67. The periphery of the boss can be slidably clamped in the first card slot. The staff can swing the wrench 67 to realize the relative rotation of the tool holder 1 in the welded pipe, so as to realize the adjustment of the tool 3 relative to the weld scar position.

[0055] The cutting tool 3 is installed on the tool holder 1 through the fixing component 7, and the fixing component 7 includes a positioning base 71. The cutting tool 3 is a hollow cylindrical structure. One end of the tool holder 1 is provided with a limiting hole 114. The outer periphery of the positioning base 71 is slidably connected into the limiting hole 114. The outer periphery of the cutting tool 3 is located within the limiting hole 114, and the lower end of the cutting tool 3 abuts against the upper end of the positioning base 71. The upper end of the positioning base 71 is provided with an adaptation groove 72, and the lower end of the cutting tool 3 is installed in the adaptation groove 72. The outer periphery of the positioning base 71 is provided with a positioning slide 73, and the side wall of the limiting hole 114 is provided with a positioning chute. The outer periphery of the positioning slide 73 is slidably connected into the positioning chute. The middle part of the positioning base 71 is provided with a guiding hole 74, and the cross-section of the guiding hole 74 is a trapezoidal structure. The inner diameter of the end of the guiding hole 74 close to the cutting tool 3 is the same as the inner diameter of the cutting tool 3, and the inner diameter of the other end of the guiding hole 74 is smaller than the inner diameter of the cutting tool 3. The inner ring of the end of the limiting hole 114 far from the cutting tool 3 is provided with an internal thread. The outer periphery of the top pin 75 is threadedly connected into the limiting hole 114, and one end of the top pin 75 abuts against one end of the positioning base 71. A first through hole is provided in the middle of the top pin 75, and the first through hole is communicated with the guiding hole 74. The positioning base 71 can lift the relative position of the cutting tool 3 on the tool holder 1 for the installation and maintenance of the cutting tool 3, and the height of the cutting tool 3 ejected relative to the tool holder 1 can be adjusted through the top pin 75 to adjust the cutting height. The guiding hole 74 is arranged in the positioning base 71 to export the waste of the scar scraping.

[0056] As Figures 11 - 14 shown, the fixing component 7 further includes a crimping plate 76. A crimping groove 113 is provided on the tool seat of the cutting tool 3. The crimping plate 76 is detachably installed in the crimping groove 113, and an arc-shaped cut is provided at one end of the crimping plate 76. The outer edge of the upper end of the cutting tool 3 abuts against the crimping groove 113. The positioning base 71 can position the lower end of the cutting tool 3. To improve the installation stability of the cutting tool 3, the crimping plate 76 is used to crimp the upper end of the cutting tool 3 to ensure the installation strength of the connection structure.

[0057] As Figures 15 - 16As shown in the figure, the internal scar scraping device of the straight seam welded pipe further includes a pressure maintaining component 8. The outlet end of the third flow channel is connected to the inlet end of the pressure maintaining component 8 through a connecting pipe. The outlet end of the pressure maintaining component 8 is open to the air or externally connected to a device (open to the air means directly released to the natural environment). The pressure maintaining component 8 is used to ensure the medium pressure in the hydraulic cavity and does not prevent the medium flow in the hydraulic cavity. The pressure maintaining component 8 includes a front sleeve 81 and a rear sleeve 82. One end of the front sleeve 81 is fixedly connected to one end of the rear sleeve 82. The other end of the front sleeve 81 is provided with a feed pipe 83. The other end of the rear sleeve 82 is provided with a discharge pipe 84. A plug 85 is arranged at the outlet end of the feed pipe 83. One end of the plug 85 is installed with a slide rod 86. The slide rod 86 and the plug 85 are arranged inside the front sleeve 81. A third support plate 87 is arranged inside the front sleeve 81. A second through hole is provided in the middle of the third support plate 87. The outer periphery of the slide rod 86 is slidably connected to the second through hole. Two bolts 88 are respectively arranged at both ends of the third support plate 87. There are third through holes on the front sleeve 81. The outer periphery of each bolt 88 is located in a third through hole. A positioning nut is arranged on the outer periphery of the bolt 88. The positioning nut is used to fix the relative positions of the bolt 88, the third support plate 87 and the front sleeve 81. The positioning nut is located outside the front sleeve 81. A compression spring 89 is arranged on the outer periphery of the slide rod 86. The two ends of the compression spring 89 respectively abut against one end of the plug 85 and one end of the third support plate 87. During implementation, the third support plate 87 can position the relative position of the front sleeve 81 through the bolt 88. The compression spring 89 is used to press the plug 85. The medium in the hydraulic cavity overcomes the elasticity of the compression spring 89 and pushes the plug 85 and the slide rod 86 to slide axially, so as to open the outlet end of the feed pipe 83 and release the medium into the front sleeve 81, the rear sleeve 82 and the discharge pipe 84. By tightening the positioning nut, the elastic force of the compression spring 43 pressing the plug 85 can be adjusted, so as to adjust the pressure maintaining pressure in the hydraulic cavity. During implementation, a pressure sensor of the prior art can be arranged on the connecting pipe to detect the pressure maintaining in the hydraulic cavity.

[0058] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Inner scar scraping device for straight seam welded pipe, characterized in that: It includes a tool holder (1). An upper guide wheel (11) is installed on the upper side of the tool holder (1), and a lower guide wheel (12) is installed on the lower side of the tool holder (1). The upper guide wheel (11) and the lower guide wheel (12) are arranged oppositely. A plurality of side guide wheels (13) are arranged around the tool holder (1), and at least one side guide wheel (13) is arranged on each side of the lower guide wheel (12). An angle is provided between each side guide wheel (13) and the lower guide wheel (12). A hydraulic cavity is provided in the tool holder (1), and a piston (14) corresponds to the lower guide wheel (12) and each side guide wheel (13) respectively. One end of the piston (14) is rotatably installed on the lower guide wheel (12) or the side guide wheel (13), and the other end of the piston (14) is slidably connected to the hydraulic cavity. The medium pressure in the hydraulic cavity can push the piston (14) to slide.

2. The internal scar scraping device for straight seam welded pipes according to claim 1, characterized in that: A connecting pipe (2) is installed at one end of the tool holder (1), and a tool (3) is installed at the other end of the tool holder (1). A water spray nozzle (15) is provided on the tool holder (1), and the water spray nozzle (15) faces the tool (3). One end of the connecting pipe (2) is connected to a water source. A first flow channel, a second flow channel and a third flow channel are provided in the connecting pipe (2). A water spray flow channel (16), a liquid inlet flow channel (17) and a liquid outlet flow channel (18) are respectively provided on the tool holder (1). The first flow channel is communicated to the water spray nozzle (15) through the water spray flow channel (16), the second flow channel is communicated to the inlet end of the hydraulic cavity through the liquid inlet flow channel (17), and the outlet end of the hydraulic cavity is communicated to the third flow channel through the liquid outlet flow channel (18).

3. The internal scar scraping device for straight seam welded pipes according to claim 2, characterized in that: One end of the tool holder (1) away from the tool (3) is a frustum structure. An avoidance groove (19) is provided on the upper side of the tool holder (1). An avoidance ring groove is provided on the periphery of the upper guide wheel (11), and the bottom surface of the avoidance groove (19) is lower than the bottom surface of the avoidance ring groove.

4. The internal scar scraping device for the longitudinally welded pipe according to claim 2, characterized in that: One side guide wheel (13) is respectively arranged on each side of the lower guide wheel (12), and the two side guide wheels (13) are arranged oppositely. The two ends of each side guide wheel (13) and the lower guide wheel (12) are respectively rotatably connected to a mounting seat (4). A mounting groove (110) is provided on the tool holder (1), and the periphery of the mounting seat (4) is slidably connected to the mounting groove (110). One end of the mounting seat (4) is fixedly connected to one end of the piston (14); A sliding groove is provided on the tool holder (1), and sliding grooves are correspondingly provided on the side walls of each mounting groove (110). A first sliding table (41) is installed on the outer wall of the mounting seat (4), and the first sliding table (41) is slidably connected to the sliding groove. An end cover (42) is detachably installed on the mounting groove (110), and the lower end of the mounting seat (4) can abut against the upper end of the end cover (42). A compression spring (43) is provided at the lower end of the first sliding table (41), and the lower end of the compression spring (43) abuts against the upper end of the end cover (42).

5. The internal scar scraping device for straight seam welded pipes according to claim 4, characterized in that: The periphery of each piston (14) is slidably connected to a sliding hole (111), and a plurality of sliding holes (111) communicate with each other to form a hydraulic cavity. A sealing ring (141) is provided between the periphery of the piston (14) and the sliding hole (111); Further, one end of the piston (14) is fixedly connected to one end of the mounting base (4). A blind hole (142) is provided at the other end of the piston (14). The outlet end of the liquid inlet channel (17) is arranged at the end of the sliding hole (111) away from the mounting base (4). The inlet end of the liquid outlet channel (18) is located on the side wall of the sliding hole (111). A first long hole (143) is axially provided on the side wall of the piston (14). The inside of the blind hole (142) is communicated to the liquid outlet channel (18) through the first long hole (143).

6. The internal scar scraping device for the longitudinally welded pipe according to claim 2, characterized in that: One section of the connecting pipe (2) is mounted on the connecting seat (6), and the other end of the connecting pipe (2) is mounted on the tool holder (1). The connecting seat (6) includes a first support plate (61) and a second support plate (62). The first support plate (61) is fixedly mounted on the external machine table. A second long hole (63) is provided on the first support plate (61). A third long hole (64) is provided on the second support plate (62). The second long hole (63) and the third long hole (64) are arranged perpendicular to each other. An arc-shaped hole (65) is provided on the first support plate (61). The arc-shaped hole (65) is located below the second long hole (63). Locking bolts (66) are respectively mounted in the first long hole (143) and the arc-shaped hole (65). The periphery of the locking bolt (66) can be detachably connected to the inside of the third long hole (64). One end of the second support plate (62) is detachably connected to the periphery of the connecting pipe (2).

7. The internal scar scraping device for the longitudinally welded pipe according to claim 6, characterized in that: A wrench (67) is arranged on the periphery of the connecting pipe (2). The wrench (67) can slide on the periphery of the connecting pipe (2). A first boss (112) is arranged on the periphery of the connecting pipe (2). A first clamping groove is provided on the inner circle of one end of the wrench (67). The periphery of the boss can be slidably clamped in the first clamping groove.

8. The internal scar scraping device for straight seam welded pipes according to claim 1, characterized in that: The tool (3) is mounted on the tool holder (1) through a fixing component (7). The fixing component (7) includes a positioning base (71). The tool (3) is a hollow cylindrical structure. A limiting hole (114) is provided at one end of the tool holder (1). The periphery of the positioning base (71) is slidably connected to the inside of the limiting hole (114). The periphery of the tool (3) is located inside the limiting hole (114). The lower end of the tool (3) abuts against the upper end of the positioning base (71). An adaptation groove (72) is provided at the upper end of the positioning base (71). The lower end of the tool (3) is mounted in the adaptation groove (72). A positioning sliding table (73) is arranged on the periphery of the positioning base (71). A positioning sliding groove is provided on the side wall of the limiting hole (114). The periphery of the positioning sliding table (73) is slidably connected to the inside of the positioning sliding groove. A guiding hole (74) is provided in the middle of the positioning base (71). The cross-section of the guiding hole (74) is a trapezoidal structure. The inner diameter of the end of the guiding hole (74) close to the tool (3) is the same as the inner diameter of the tool (3). The inner diameter of the other end of the guiding hole (74) is smaller than the inner diameter of the tool (3).

9. The internal scar scraping device for the longitudinally welded pipe according to claim 8, characterized in that: Internal threads are provided on the inner circle of the end of the limiting hole (114) away from the tool (3). The periphery of the top pin (75) is threadedly connected to the inside of the limiting hole (114). One end of the top pin (75) abuts against one end of the positioning base (71). A first through hole is provided in the middle of the top pin (75). The first through hole is communicated with the guiding hole (74). The fixing component (7) further includes a crimping plate (76). A crimping groove (113) is provided on the tool (3) seat. The crimping plate (76) is detachably installed in the crimping groove (113). An arc-shaped cut is provided at one end of the crimping plate (76). The outer edge of the upper end of the tool (3) abuts against the inside of the crimping groove (113).

10. The internal scar scraping device for the longitudinally welded pipe according to claim 2, characterized in that: It further includes a pressure-holding component (8). The outlet end of the third flow channel is connected to the inlet end of the pressure-holding component (8) through a connecting pipe. The outlet end of the pressure-holding component (8) is open to the air or externally connected to a device. The pressure-holding component (8) includes a front sleeve (81) and a rear sleeve (82). One end of the front sleeve (81) is fixedly connected to one end of the rear sleeve (82). A feed pipe (83) is provided at the other end of the front sleeve (81). A discharge pipe (84) is provided at the other end of the rear sleeve (82). A plug (85) is provided at the outlet end of the feed pipe (83). A slide rod (86) is installed at one end of the plug (85). The slide rod (86) and the plug (85) are arranged inside the front sleeve (81). A third support plate (87) is arranged inside the front sleeve (81). A second through hole is provided in the middle of the third support plate (87). The periphery of the slide rod (86) is slidably connected to the second through hole. A bolt (88) is provided at each end of the third support plate (87). A third through hole is provided on the front sleeve (81). The periphery of each bolt (88) is located in a third through hole. A positioning nut is provided on the periphery of the bolt (88). The positioning nut is used to fix the relative positions of the bolt (88), the third support plate (87) and the front sleeve (81). The positioning nut is located outside the front sleeve (81). A compression spring (89) is provided on the periphery of the slide rod (86). The two ends of the compression spring (89) respectively abut against one end of the plug (85) and one end of the third support plate (87).

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