An inside core drawing machine for straight seam welded pipe

Abstract

The present application relates to a kind of straight seam welded pipe inner welding core cold-drawing machine, belong to steel pipe welding technical field.Guiding rail is installed on the first half of frame, rail car is installed on guiding rail, chain transmission device is installed on frame, rail car is drivingly connected with chain transmission device, drawing knife rod is installed on rail car, axial limiting plate is vertically installed on the frame of the end of guiding rail, axial limiting plate is provided with the through hole for drawing knife rod to pass, lifting support device and pressing device are installed in the middle and tail of frame;Through lifting support device, pressing device and axial limiting plate, the steel pipe to be processed is fixed, by pushing rail car to drive drawing knife rod to extend into the steel pipe to be processed, through chain transmission device to pull rail car and drawing knife rod, the welding scar is drawn and removed, welding scar is removed by drawing, and the removal effect is good, processing speed is fast, which is beneficial to improve work efficiency, reduce labor intensity, save time and effort.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of steel pipe welding, and particularly relates to a straight seam welded pipe inner welding core cold drawing machine. BACKGROUND

[0002] Welded steel pipe, also known as welded pipe, is a steel pipe made by winding and welding steel plate or strip. Welded steel pipe has simple production process, high production efficiency, various specifications, and low equipment investment, but its strength is generally lower than that of seamless steel pipe. Straight seam welded pipe has simple production process, high production efficiency, and low cost, and thus develops rapidly. In the production process of general welded pipe, a forming machine is used to bend and fold the steel strip. After bending, a high-frequency welding device is used to weld the arc-shaped steel strip. Then, a scar removing device is used to remove the welding scars (welding cores).

[0003] For example, in the application No. CN202120713227.6, the patent name is a high-frequency straight seam welded pipe inner burr removing device. When in use, it needs to be manually held and operated, which is inconvenient to use, has high labor intensity, and has a short length that can be inserted, and the use range is limited. In the application No. CN201410125054.0, the patent name is a straight seam steel pipe inner burr removing mechanism. A plurality of arc-shaped blades are driven by a driving motor to clean. In order to ensure the driving force, the motor has a certain size. The use of the burr removing mechanism is limited by the pipe diameter, and the steel pipe with a small diameter cannot be processed. At the same time, when the welding scar is large, the motor is easy to be stuck, and the cleaning effect is poor.

[0004] According to the related technologies described above, the inventors believe that the following defects exist: the existing straight seam steel pipe inner welding scar removing device is limited by the pipe length or driving force, has poor cleaning effect, low work efficiency, high labor intensity, and is time-consuming and laborious. SUMMARY

[0005] In order to overcome the problems of the existing straight seam steel pipe inner welding scar removing device in the background art, such as being limited by the pipe length or driving force, having poor cleaning effect, low work efficiency, high labor intensity, and being time-consuming and laborious, the present application provides a straight seam welded pipe inner welding core cold drawing machine. The present application fixes the steel pipe to be processed by the lifting support device, the pressing device, and the axial limiting plate. The drawing knife rod is driven to extend into the steel pipe to be processed by the track car. The welding scar is drawn and removed by the chain transmission device. The welding scar is removed by drawing, which has good cleaning effect, fast processing speed, and is beneficial to improve work efficiency, reduce labor intensity, save time and labor.

[0006] In order to achieve the above object, the present application is realized by the following technical scheme: a straight seam welded pipe inner welding core cold drawing machine mainly comprises a rack 1, a guide rail 2, a track vehicle 3, a chain transmission device 4, a drawing knife rod 5, an axial limiting plate 6, a lifting supporting device 7, a pressing device 8, the guide rail 2 is installed on the front half of the rack 1, the track vehicle 3 is installed on the guide rail 2, the chain transmission device 4 is installed on the rack 1, the track vehicle 3 is in transmission connection with the chain transmission device 4, the drawing knife rod 5 is installed on the track vehicle 3, the axial limiting plate 6 is installed upright on the rack 1 at the end of the guide rail 2, a through hole for the drawing knife rod 5 to pass through is formed in the axial limiting plate 6, the lifting supporting device 7 and the pressing device 8 are installed on the middle and tail of the rack 1.

[0007] Further, the drawing knife rod 5 comprises a drawing rod 51, an annular knife 52 and an elastic supporting assembly 53, the drawing rod 51 is installed at the end on the track vehicle 3, the annular knife 52 is installed on the top of the front end of the drawing rod 51, and the elastic supporting assembly 53 is installed on the bottom of the front end of the drawing rod 51.

[0008] Further, the elastic supporting assembly 53 comprises a swing rod 54, a supporting wheel 55 and an elastic assembly 56, the swing rod 54 is hinged at the bottom of the drawing rod 51 at the front end, the supporting wheel 55 is installed at the end of the swing rod 54 through a bearing, and the elastic assembly 56 is hinged at the middle of the swing rod 54 and the drawing rod 51 at two ends respectively.

[0009] Further, the bottom of the front end of the drawing rod 51 is provided with a sliding groove 57, an adjusting screw rod 58 is installed in the sliding groove 57 through a bearing, a sliding block 59 is slidably installed in the sliding groove 57, the sliding block 59 is in threaded connection with the adjusting screw rod 58, one end of the elastic assembly 56 is hinged on the sliding block 59, and the end of the adjusting screw rod 58 is provided with a square section for conveniently adjusting force.

[0010] Further, the track vehicle 3 is in transmission connection with the chain transmission device 4 through a hook pulling rod, the hook pulling rod comprises a pulling arm 31, a connecting rod 32, a rotating rod 33, a swing arm 34 and a control rod 35, the pulling arm 31 is hinged at the middle on the front end of the track vehicle 3, the rotating rod 33 is installed on the track vehicle 3 through a bearing, the swing arm 34 is fixedly installed on the rotating rod 33, the connecting rod 32 is hinged at two ends on the end of the pulling arm 31 and the top end of the swing arm 34 respectively, the control rod 35 is installed on the rotating rod 33, and the front end of the pulling arm 31 is provided with a hook 36 which can be inserted into a chain link of a transmission chain of the chain transmission device 4.

[0011] Further, the lifting supporting device 7 comprises a sliding groove 71, a sliding block 72, a screw rod 73 and a supporting roller 74, the sliding groove 71 is installed on the rack 1, the sliding block 72 is slidably and limitingly installed in the sliding groove 71, the screw rod 73 is installed in the sliding groove 71 through a bearing, the sliding block 72 is in threaded connection with the screw rod 73, and the supporting roller 74 is installed on the sliding block 72 through bearings at two ends, and a hand wheel is arranged on the screw rod 73 for conveniently adjusting.

[0012] Further, the support roller 74 is a V-shaped conveying roller.

[0013] Further, the pressing device 8 comprises a support frame 81, a double-threaded rod 82, movable arms 83, and a pressing roller 84, the support frame 81 is installed on the rack 1, the support frame 81 is provided with a guide groove 85, the double-threaded rod 82 is installed in the guide groove 85 through a bearing, the movable arms 83 are top-positioned installed in the guide groove 85, the top ends of the two movable arms 83 are respectively threadedly connected with left-threaded and right-threaded segments of the double-threaded rod 82, one end of the double-threaded rod 82 is provided with an adjusting hand wheel, the pressing roller 84 is installed on the movable arm 83 through a bearing, the lower half of the movable arm 83 is outwardly inclined, the pressing roller 84 is installed on the inner side of the inclined segment of the movable arm 83 through a bearing, and the pressing roller 84 is a concave curved roller.

[0014] Further, the rack 1 at the end of the chain transmission device 4 is provided with a limiting roller 9 for supporting the drawing knife rod 5, the limiting roller 9 is installed on the guide rail 2 through a slidable trolley 91, and the slidable trolley 91 can be fixed on the rack 1 through a pin shaft 92.

[0015] Further, the guide groove 85 is provided with a guide support rod 86 for avoiding the double-threaded rod 82 from being bent under force.

[0016] The beneficial effects of the present application are as follows:

[0017] The present application fixes the steel pipe to be machined through the lifting support device, the pressing device, and the axial limiting plate, drives the drawing knife rod to extend into the steel pipe to be machined through the trolley, and pulls the trolley and the drawing knife rod through the chain transmission device to draw and remove the welding scar, so that the welding scar is removed in the drawing mode, the removal effect is good, the machining speed is fast, the work efficiency is improved, the labor intensity is reduced, and time and labor are saved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a main shaft perspective view of the present application.

[0019] Figure 2 is a rear shaft perspective view of the present application.

[0020] Figure 3 is Figure 2 is a partial enlarged view of position A in FIG.

[0021] Figure 4 is Figure 2 is a partial enlarged view of position B in FIG.

[0022] Figure 5 is a structure schematic view of the lifting support device and the pressing device of the present application.

[0023] Figure 6 is a front end of the drawing knife bar of the present application, a front view.

[0024] Figure 7 is a front end of the drawing knife bar of the present application, a front view.

[0025] Figure 8 is a front end of the drawing knife bar of the present application, a front view.

[0026] Figure 9 is a front end of the drawing knife bar of the present application, a front view. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and beneficial effects of the present application more clear, the preferred embodiments of the present application will be described in detail below with reference to the drawings, so as to facilitate the understanding of the skilled in the art.

[0028] The application discloses a straight seam welded pipe inner welding core cold-drawing machine, which mainly comprises a rack 1, a guide rail 2, a track vehicle 3, a chain transmission device 4, a drawing knife bar 5, an axial limiting plate 6, a lifting supporting device 7 and a pressing device 8. The guide rail 2 is installed on the front half of the rack 1, the track vehicle 3 is installed on the guide rail 2, the chain transmission device 4 is installed on the rack 1, the track vehicle 3 is in transmission connection with the chain transmission device 4, the drawing knife bar 5 is installed on the track vehicle 3, the axial limiting plate 6 is installed upright on the rack 1 at the end of the guide rail 2, a through hole is formed in the axial limiting plate 6 and used for the drawing knife bar 5 to pass through, the lifting supporting device 7 and the pressing device 8 are installed on the middle and tail of the rack 1, a steel pipe to be processed is first placed on the lifting supporting device 7, the drawing knife bar is pushed into the steel pipe to be processed by the track vehicle, the height of the steel pipe to be processed is adjusted by the lifting supporting device, the top (welding seam) of the steel pipe to be processed is matched with the drawing knife bar, so that the welding scar can be drawn and removed, and the steel pipe to be processed is fixed by the pressing device and the axial limiting plate; the track vehicle and the drawing knife bar are pulled by the chain transmission device, and the welding scar is drawn and removed. The welding scar is removed by drawing, the removal effect is good, the processing speed is fast, the working efficiency is improved, the labor intensity is reduced, and time and labor are saved.

[0029] The drawing knife bar 5 comprises a pulling rod 51, an annular knife 52 and an elastic supporting assembly 53. The pulling rod 51 is installed at the end of the track vehicle 3, the annular knife 52 is installed at the top of the front end of the pulling rod 51, and the elastic supporting assembly 53 is installed at the bottom of the front end of the pulling rod 51 and supported on the inner wall of the steel pipe, so that the drawing knife bar 5 is prevented from being withdrawn due to the overlength of the pulling rod 51, the annular knife 52 is effectively ensured to be attached to the inner wall of the steel pipe, and the removal effect of the welding scar is ensured.

[0030] The elastic support assembly 53 comprises a swing lever 54, a support wheel 55 and an elastic assembly 56, the front end of the swing lever 54 is hinged to the bottom of the pull rod 51, the support wheel 55 is installed at the end of the swing lever 54 through a bearing, the two ends of the elastic assembly 56 are hinged to the middle of the swing lever 54 and the pull rod 51 respectively, the support wheel 55 is in contact with the inner wall of the steel pipe, which avoids scratching the inner wall of the steel pipe and reduces the friction at the same time, the elastic assembly 56 supports the swing lever 54, which ensures a certain supporting force and a certain activity, facilitates the extension of the drawing blade rod 5 into the steel pipe, and is suitable for processing steel pipes with a certain range of diameters.

[0031] The front end of the pull rod 51 is provided with a sliding groove 57, an adjusting screw rod 58 is installed in the sliding groove 57 through a bearing, a sliding block 59 is slidably installed in the sliding groove 57, the sliding block 59 is threadedly connected with the adjusting screw rod 58, one end of the elastic assembly 56 is hinged to the sliding block 59, the end of the adjusting screw rod 58 is provided with a square section for convenient force adjustment, the angle of the elastic assembly 56 is changed by adjusting the adjusting screw rod 58, and then the included angle between the swing lever 54 and the pull rod 51 is changed, and the applicable range is increased.

[0032] The rail car 3 and the chain transmission device 4 are connected through a hook pull rod, the hook pull rod comprises a pull arm 31, a connecting rod 32, a rotating rod 33, a swing arm 34 and a control rod 35, the middle of the pull arm 31 is hinged to the front end of the rail car 3, the rotating rod 33 is installed on the rail car 3 through a bearing, the swing arm 34 is fixedly installed on the rotating rod 33, the two ends of the connecting rod 32 are hinged to the end of the pull arm 31 and the top end of the swing arm 34 respectively, the control rod 35 is installed on the rotating rod 33, the front end of the pull arm 31 is provided with a hook 36 which can be inserted into the chain link of the chain transmission device 4, the rotating rod 33 and the swing arm 34 are rotated by operating the control rod 35, the end of the pull arm 31 is pulled up or pressed down through the connecting rod 32, the hook 36 at the front end of the pull arm 31 is hooked into or separated from the chain link of the chain transmission device 4 through the hinging action of the pull arm 31, the connection and disconnection of the transmission are realized, the operation is facilitated, the movement of the rail car 3 is more flexible, and the working efficiency is improved.

[0033] The lifting support device 7 comprises a sliding groove 71, a sliding block 72, a screw rod 73 and a support roller 74, the sliding groove 71 is installed on the rack 1, the sliding block 72 is slidably and limitingly installed in the sliding groove 71, the screw rod 73 is installed in the sliding groove 71 through a bearing, the sliding block 72 is threadedly connected with the screw rod 73, the two ends of the support roller 74 are installed on the sliding block 72 through bearings, a hand wheel is arranged on the screw rod 73 for convenient adjustment, the height of the support roller 74 is changed by operating the hand wheel, and then the top (welding seam) of the steel pipe with different diameters is matched with the height of the drawing blade rod, and the welding scar removal effect is ensured. The support roller 74 is a V-shaped conveying roller, which has a positioning effect on the steel pipe.

[0034] The pressing device 8 comprises a support frame 81, a double-threaded rod 82, movable arms 83, and a compression roller 84. The support frame 81 is installed on the frame 1, and a guide groove 85 is arranged on the support frame 81. The double-threaded rod 82 is installed in the guide groove 85 through a bearing. The movable arms 83 are top-positioned and installed in the guide groove 85. The top ends of the two movable arms 83 are respectively threadedly connected with left-threaded and right-threaded segments of the double-threaded rod 82. An adjusting hand wheel is installed at one end of the double-threaded rod 82. The compression roller 84 is installed on the movable arms 83 through a bearing. The lower half of the movable arms 83 is outwardly inclined. The compression roller 84 is installed on the inner side of the inclined segment of the movable arms 83 through a bearing. The compression roller 84 is a concave curved roller. By operating the adjusting hand wheel, the double-threaded rod 82 simultaneously drives the two movable arms 83 to move towards or away from each other, so as to facilitate adjustment and improve the adjustment efficiency. The compression roller 84 is pressed on the left upper and right upper positions of the steel pipe, so as to ensure firm fixation and avoid swinging of the steel pipe.

[0035] A limiting roller 9 for supporting the drawing knife rod 5 is installed at the end of the chain transmission device 4 on the frame 1. The limiting roller 9 is installed on the guide rail 2 through a slidable trolley 91. The slidable trolley 91 is fixed on the frame 1 through a pin shaft 92. The limiting roller 9 supports the drawing knife rod 5, so as to avoid affecting the balance of the track trolley 3 due to the excessive length of the drawing knife rod 5.

[0036] A guide support rod 86 is installed in the guide groove 85 to avoid bending of the double-threaded rod 82 under stress.

[0037] Working process:

[0038] First, the steel pipe to be processed is hoisted and placed on the lifting support device 7 for pre-positioning; by operating the joystick 35, the rotating rod 33 and the swing arm 34 are rotated, the end of the pull arm 31 is pressed down through the connecting rod 32, the pull arm 31 swings under the action of the hinge, the hook 36 at the front end of the pull arm 31 is separated from the transmission chain link of the chain transmission device 4, and the rail car is pushed to extend the drawing knife rod into the steel pipe to be processed; by operating the hand wheel to change the height of the supporting roller 74, the height of the steel pipe to be processed is adjusted by the lifting support device, so that the top of the steel pipe to be processed (welding seam) matches the drawing knife rod, ensuring that the welding scar can be drawn and removed; by operating the adjusting hand wheel, the double-threaded rod 82 simultaneously drives the two movable arms 83 to move towards each other, the pressure roller 84 is pressed on the upper left and upper right positions of the steel pipe, ensuring firm fixation and avoiding swinging of the steel pipe, the steel pipe to be processed is fixed and limited by the pressing device and the axial limiting plate, the steel pipe is supported by the axial limiting plate 6 to avoid axial movement of the steel pipe during drawing; by adjusting the adjusting screw 58 to change the angle of the elastic assembly 56, the included angle between the swing rod 54 and the pull rod 51 is changed, so that the elastic assembly 56 is in a compressed state, and the supporting wheel 55 is supported on the inner wall of the steel pipe; by operating the joystick 35, the rotating rod 33 and the swing arm 34 are rotated, the end of the pull arm 31 is pulled (lifted) through the connecting rod 32, the pull arm 31 swings under the action of the hinge, the hook 36 at the front end of the pull arm 31 is hung in the transmission chain link of the chain transmission device 4, and the rail car and the drawing knife rod are pulled by the chain transmission device to draw and remove the welding scar; the welding scar is removed by drawing, which has good removal effect, fast processing speed, is conducive to improving work efficiency, reducing labor intensity, saving time and effort.

[0039] Finally, it should be pointed out that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and detail without departing from the scope defined by the claims of the present application.

Claims

1. A cold drawing machine for the inner core of a straight seam welded pipe, characterized in that: The cold drawing machine for the inner core of the straight seam welded pipe includes a frame (1), a guide rail (2), a railcar (3), a chain drive device (4), a drawing bar (5), an axial limiting plate (6), a lifting support device (7), and a clamping device (8). The guide rail (2) is installed on the front half of the frame (1), the railcar (3) is installed on the guide rail (2), the chain drive device (4) is installed on the frame (1), the railcar (3) is connected to the chain drive device (4), the drawing bar (5) is installed on the railcar (3), the axial limiting plate (6) is installed upright on the frame (1) at the end of the guide rail (2), and the axial limiting plate (6) has a through hole for the drawing bar (5) to pass through. The lifting support device (7) and the clamping device (8) are installed in the middle and tail of the frame (1). The lifting support device (7) includes a slide groove (71), a slider (72), a lead screw (73), and a support roller (74). The slide groove (71) is installed on the frame (1). The slider (72) is slidably and limitedly installed in the slide groove (71). The lead screw (73) is installed in the slide groove (71) through a bearing. The slider (72) and the lead screw (73) are threadedly connected. The two ends of the support roller (74) are installed on the slider (72) through bearings. The lead screw (73) is provided with a handwheel for easy adjustment. The pressing device (8) includes a support frame (81), a double threaded rod (82), a movable arm (83), and a pressure roller (84). The support frame (81) is mounted on the frame (1). The support frame (81) is provided with a guide groove (85). The double threaded rod (82) is mounted in the guide groove (85) through a bearing. The top end of the movable arm (83) is limited and mounted in the guide groove (85). The top ends of the two movable arms (83) are respectively threaded to the left-hand thread section and the right-hand thread section of the double threaded rod (82). An adjusting handwheel is installed at one end of the double threaded rod (82). The pressure roller (84) is mounted on the movable arm (83) through a bearing. The lower half of the movable arm (83) is inclined outward. The pressure roller (84) is mounted on the inner side of the inclined section of the movable arm (83) through a bearing. The pressure roller (84) is a concave curved surface pressure roller.

2. The cold drawing machine for the inner core of a straight seam welded pipe as described in claim 1, characterized in that: The pull bar (5) includes a pull rod (51), a ring cutter (52), and an elastic support assembly (53). The end of the pull rod (51) is mounted on the railcar (3), the ring cutter (52) is mounted on the top of the front end of the pull rod (51), and the elastic support assembly (53) is mounted on the bottom of the front end of the pull rod (51).

3. The cold drawing machine for the inner core of a straight seam welded pipe as described in claim 2, characterized in that: The elastic support assembly (53) includes a swing rod (54), a support wheel (55), and an elastic component (56). The front end of the swing rod (54) is hinged to the bottom of the pull rod (51), the support wheel (55) is mounted on the end of the swing rod (54) through a bearing, and the two ends of the elastic component (56) are respectively hinged to the middle of the swing rod (54) and the pull rod (51).

4. The cold drawing machine for the inner core of a straight seam welded pipe as described in claim 3, characterized in that: The pull rod (51) has a groove (57) at the bottom of its front end. An adjusting screw (58) is installed in the groove (57) through a bearing. A sliding block (59) is slidably installed in the groove (57). The sliding block (59) is threadedly connected to the adjusting screw (58). One end of the elastic component (56) is hinged to the sliding block (59). The end of the adjusting screw (58) has a square section for easy force adjustment.

5. A cold drawing machine for the inner core of a straight seam welded pipe as described in any one of claims 1-3, characterized in that: The railcar (3) and the chain drive device (4) are connected by a hook rod. The hook rod includes a pull arm (31), a connecting rod (32), a rotating rod (33), a swing arm (34), and a control lever (35). The middle of the pull arm (31) is hinged to the front end of the railcar (3). The rotating rod (33) is mounted on the railcar (3) through a bearing. The swing arm (34) is fixedly mounted on the rotating rod (33). The two ends of the connecting rod (32) are respectively hinged to the end of the pull arm (31) and the top of the swing arm (34). The control lever (35) is mounted on the rotating rod (33). The front end of the pull arm (31) is provided with a hook (36) that can be inserted into the chain link of the chain drive device (4).

6. A cold drawing machine for the inner core of a straight seam welded pipe as described in any one of claims 1-3, characterized in that: The support roller (74) is a V-shaped conveyor roller.

7. A cold drawing machine for the inner core of a straight seam welded pipe as described in any one of claims 1-3, characterized in that: The chain drive device (4) has a limiting roller (9) that supports the pulling knife bar (5) installed on the frame (1) at the end. The limiting roller (9) is installed on the guide rail (2) by a sliding trolley (91). The sliding trolley (91) can be fixed on the frame (1) by a pin (92).

8. The cold drawing machine for the inner core of a straight seam welded pipe as described in claim 7, characterized in that: The guide groove (85) is equipped with a guide support rod (86) to prevent the double threaded rod (82) from bending under force.

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