A device for scraping off weld nodules on the inner wall of a steel pipe

Abstract

A device for scraping off weld nodules on the inner wall of a steel pipe comprises a frame, a motor, a transmission mechanism, a steel pipe fixing mechanism, a guide mechanism and a scraping knife bar. The transmission mechanism is provided with a lead screw pair. The lead screw pair, a first knife bar bracket, a guide mechanism, a steel pipe fixing mechanism and a second knife bar bracket are sequentially arranged on the upper part of the frame. The motor is arranged at the lower part of one end of the frame. The motor drives a pull rod through the transmission mechanism, and the pull rod drives the scraping knife bar to move linearly. The scraping knife bar probes into the inner hole of the steel pipe to be processed. The scraping guide rod is provided with a scraping knife. With the movement of the scraping knife bar, the scraping knife cuts off the weld nodules on the inner wall of the steel pipe. The present invention can scrape off weld nodules on the inner wall of the steel pipe with high efficiency, successfully solves the problem of scraping off the inner wall of the steel pipe product, avoids waste caused by weld nodules on the inner wall of the steel pipe, and reduces production costs.

Description

Technical Field

[0001] The invention relates to a steel pipe processing device, in particular to a steel pipe inner wall weld bead downline scraping device. Background Art

[0002] A tube product for automobiles, with a diameter of 45-90mm and a length of 500-1200mm. The main processing process is to form the steel strip on the equipment and then weld it by high-frequency heating. After welding, weld nodules (commonly known as weld scars) higher than the inner and outer surfaces of the steel pipe will be formed at the weld. In order to ensure the quality of the steel pipe, the "weld nodules" on the welds on the inner and outer surfaces of the steel pipe need to be scraped and hung according to the curvature of the inner and outer surfaces of the steel pipe. At present, high-frequency welded pipe production lines are equipped with online scar scraping devices on the inner and outer surfaces of steel pipes, and the weld scars are scraped off before the steel pipe is shaped to ensure smooth online shaping after welding and produce qualified steel pipe products. However, during the production process, it is difficult to avoid unqualified products due to the failure of "scraping scars" to meet the standards due to comprehensive debugging of various parts of the equipment or some individual reasons. Once these unqualified products leave the high-frequency welded pipe production line (steel pipe offline), it is very difficult to repair them. If the weld bead on the outer surface of the steel pipe is "scratched" and unqualified, it can be repaired manually with ordinary tools. If the weld bead on the inner surface of the steel pipe is "scratched" and unqualified, it cannot be repaired with ordinary tools and can only be scrapped, resulting in increased production costs. Summary of the invention

[0003] The purpose of the present invention is to overcome the drawbacks of the prior art and provide a steel pipe inner wall weld nodule scraping device which can effectively remove the weld scar on the inner surface of the steel pipe.

[0004] The problem described in the present invention is achieved by the following technical solution:

[0005] A device for scraping off weld nodules on the inner wall of a steel pipe comprises a frame, a motor, a transmission mechanism, a steel pipe fixing mechanism, a guide mechanism and a scraping knife bar. The transmission mechanism is provided with a lead screw pair. The lead screw pair, a first knife bar bracket, a guide mechanism, a steel pipe fixing mechanism and a second knife bar bracket are sequentially arranged on the upper part of the frame. The motor is arranged at the lower part of one end of the frame. The motor drives a pull rod through the transmission mechanism, and the pull rod drives the scraping knife bar to move linearly. The scraping knife bar probes into the inner hole of the steel pipe to be processed. A scraping knife is provided on the scraping guide rod. As the scraping knife bar moves, the scraping knife cuts off the weld nodules on the inner wall of the steel pipe.

[0006] The above-mentioned steel pipe inner wall weld nodule scraping device, the scraping knife bar is provided with a knife bar body, an upper supporting wheel and a tensioning mechanism, the rear end of the knife bar body is provided with a pull rod shaft connected to the pull rod, the front end longitudinal section of the knife bar body is wedge-shaped, two freely rotatable upper supporting wheels are arranged, the two upper supporting wheels are respectively assembled on the front and rear sides of the knife bar body, the two upper supporting wheels protrude from the upper part of the knife bar body, and the upper supporting wheels are provided with an annular groove; the middle part of the knife bar body is provided with a mounting groove for assembling the tensioning mechanism, and the tensioning mechanism includes There are two tensioning rods and two tensioning springs symmetrically arranged on the scraper wheel, and tensioning wheels are respectively installed at the distal ends of the two tensioning rods. The proximal ends of the two tensioning rods are hinged to the knife rod body by a pin shaft, the middle part of each tensioning rod is connected to one end of the tensioning spring, and the other end of the tensioning spring is connected to the knife rod body, and the two tensioning wheels protrude from the lower part of the knife rod body; a scraping knife shaft is provided at the front part of the knife rod body, and a ring-shaped scraping knife is installed on the scraping knife shaft, and a fixing screw is provided on the side of the scraping knife shaft, and the fixing screw touches and presses on the lower side of the scraping knife.

[0007] The above-mentioned device for scraping off weld nodules on the inner wall of a steel pipe has the scraper shaft tilted axially relative to the arbor body, with an inclination angle B1 of 25°-35°. The blade diameter of the scraper matches the inner diameter of the processed steel pipe, and the inclination angle B2 of the scraper blade surface relative to the inner wall of the steel pipe is 15°-25°.

[0008] The above-mentioned steel pipe inner wall weld nodule scraping device, the tensioning mechanism is also provided with two adjusting top screws, each adjusting top screw is screwed to the cutter bar body, and the end of each adjusting top screw touches and presses each tensioning rod respectively.

[0009] The above-mentioned steel pipe inner wall weld nodule scraping device has a work table fixed on the upper part of the frame, an adjustment table is provided on the upper part of the work table, a steel pipe fixing mechanism is installed on the adjustment table, two sets of steel pipe fixing mechanisms are arranged, each steel pipe fixing mechanism includes a steel pipe support and a quick pressing clamp, a V-shaped groove is provided on the steel pipe support, the lower part of the steel pipe support is connected to the supporting frame, the upper part of the supporting frame passes through the fixed table, and the top of the supporting frame is connected to the adjusting table.

[0010] The above-mentioned steel pipe inner wall weld nodule scraping device, the transmission mechanism is provided with a belt drive, the belt drive transmits the motor power to the screw of the screw pair, the nut of the screw pair is threadedly connected to the screw, the bottom of the nut is fixed with a slider, the slider is slidably matched with the slide rail fixed on the frame, and the nut is connected to the pull rod.

[0011] The above-mentioned steel pipe inner wall weld nodule scraping device, the guide mechanism is provided with a guide seat, a guide sleeve, a guide slider and a guide slider adjusting screw, the guide seat is installed on a fixed table, the guide slider is located in the guide seat, the guide slider can slide up and down relative to the guide seat, the guide sleeve is installed in the guide slider, the bottom of the guide slider adjusting screw is connected to the guide slider, the middle part of the guide slider adjusting screw is matched with the guide seat top plate thread, and the upper part of the guide slider adjusting screw is provided with an adjustment handle.

[0012] The above-mentioned steel pipe inner wall weld nodule scraping device has a support frame with a fixed block and a height adjustment screw, the fixed block is connected to the work table, the two sides of the fixed block are slidably matched with the support frame, the upper end of the height adjustment screw is connected to the height adjustment slider, the middle part of the height adjustment screw is threadedly matched with the bottom plate of the support frame, and a height adjustment handle is provided at the bottom of the height adjustment screw.

[0013] The above-mentioned steel pipe inner wall weld nodule scraping device has two sets of steel pipe fixing mechanisms, one set of which is fixed near the guide seat, and the other set is adjustable. A bolt slide groove is provided on the adjustment table, and the bolt passes through the bolt slide groove to fix the steel pipe support of the adjustable steel pipe fixing mechanism.

[0014] The above-mentioned steel pipe inner wall weld nodule scraping device also includes a screw pull rod support frame, which is fixed to the upper part of the frame and supports the pull rod and the screw respectively from top to bottom.

[0015] The present invention is designed to solve the problem of removing weld nodules on the inner surface of offline steel pipe products. The device is driven by a motor, and drives a scraping knife rod through a belt, a screw pair, and a pull rod to penetrate into the interior of the steel pipe for linear motion. The scraping knife rod is provided with an annular knife head, and the annular knife head scrapes and repairs the scraped area in the inner hole of the steel pipe until the product requirements are met. The main features of the present invention are as follows: 1. By replacing the scraper rod, it can meet the scraping needs of various specifications of pipe products; 2. The primary transmission of the device adopts belt transmission, which can protect the scraper rod from damage, and the secondary transmission adopts a combination of a lead screw pair and a linear guide rail to ensure that the speed of the scraper rod is uniform and stable during the scraping process, and the tension change is small, which can control the vibration of the scraping tool and greatly improve the service life of the scraping tool; 3. The scraper rod and the pull rod are connected by a hook, which is convenient for fast hanging and unloading of the knife rod, and can improve production efficiency; 4. The scraper rod adopts an upper and tensioning wheel structure to ensure a smooth scraping process, easy to control the scraping height size, and greatly improve the scraping quality; 5. Adjusting the table setting can meet the processing of steel pipes of different diameters. In summary, the device successfully solves the problem of scraping under the inner wall line of steel pipe products, can avoid waste caused by weld nodules on the inner wall of steel pipes, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a three-dimensional picture of the scar scraping knife bar;

[0019] Figure 3 It is a cross-sectional view of the scar scraping knife bar;

[0020] Figure 4 It is a three-dimensional diagram of the motor and transmission mechanism;

[0021] Figure 5 It is a three-dimensional diagram of the guide mechanism and the steel pipe fixing mechanism;

[0022] Figure 6 It is a structural diagram of the steel pipe fixing mechanism and the supporting frame.

[0023] The numbers in the figure are: 1, frame, 2, motor, 3, belt drive, 4, lead screw, 5, nut, 6, lead screw pull rod support frame, 7, first tool rod bracket, 8, guide mechanism, 8-1, guide sleeve, 8-2, guide seat, 8-3, guide slide block, 8-4, guide slide block adjustment screw, 8-5, adjustment handle, 9, steel pipe fixing mechanism, 9-1, quick pressing clamp, 9-2, steel pipe support, 10, adjustment table, 10-1, bolt slide groove, 11, work table, 12, pull rod, 12 -1. Hook, 13. Scar scraping knife bar, 13-1. Upper supporting wheel, 13-2. Fixing screw, 13-3. Scar scraping knife, 13-4. Pull rod shaft, 13-5. Tensioning wheel, 13-6. Tensioning rod, 13-7. Adjusting top screw, 13-8. Spring, 13-9. Scar scraping knife shaft, 13-10. Knife bar body, 14. Slide rail, 15. Support frame, 15-1. Fixed block, 15-2 Height adjustment screw, 15-3. Height adjustment handle, 16. Steel pipe, 17. Second knife bar bracket. DETAILED DESCRIPTION

[0024] See also Figure 1 , Figure 4 The present invention comprises a frame 1, a motor 2, a transmission mechanism, a steel pipe fixing mechanism 9, a guide mechanism 8, a pull rod 12 and a scar scraping knife bar 13. The transmission mechanism is provided with a belt transmission 3 and a screw pair transmission. The screw pair, the first knife bar bracket 7, the guide mechanism, the steel pipe fixing mechanism, and the second knife bar bracket 17 are arranged in sequence from left to right on the upper part of the frame. The belt transmission transmits the motor power to the screw 4 of the screw pair, the nut 5 of the screw pair is threadedly connected to the screw, the slider is fixed at the bottom of the nut, the slider is slidably matched with the slide rail 14 fixed on the frame, and the nut is connected to the pull rod. The motor drives the pull rod 12 to move linearly through the transmission mechanism, and the hook 12-1 set at the front end of the pull rod is connected and drives the scar scraping knife bar 13 to move linearly, and the scar scraping knife bar probes into the inner hole of the steel pipe 16 to be processed. The scar scraping knife 13-3 is provided on the scar scraping guide rod. With the linear movement of the scar scraping knife bar, the scar scraping knife cuts off the weld nodule on the inner wall of the steel pipe. The two ends of the screw are supported by support frames, among which the support frame at the right end of the screw is a screw tie rod support frame 6, which is fixed to the upper part of the frame, and the upper and lower parts of the screw tie rod support frame respectively support the right end of the screw and the left end of the tie rod to avoid the tie rod bending and sagging due to gravity when the nut moves to the right end.

[0025] See also Figure 2 , Figure 3The scar scraping knife bar used for installing the scar scraping knife is provided with a knife bar body 13-10, an upper support wheel 13-1 and a tensioning mechanism. The rear end of the knife bar body is provided with a pull rod shaft 13-4 connected to the pull rod hook. The front end longitudinal section of the knife bar body is wedge-shaped to facilitate entry into the steel pipe. Two freely rotatable upper support wheels are provided, and the two upper support wheels are respectively assembled on the front and rear sides of the knife bar body. The two upper support wheels protrude from the upper part of the knife bar body and touch the upper part of the inner wall of the steel pipe. The upper support wheel is provided with an annular groove, and the groove corresponds to the weld nodule. An installation groove for assembling the tensioning mechanism is provided in the middle part of the knife bar body. The tensioning mechanism includes two tensioning rods 13-6 and two tensioning springs 13-8 symmetrically arranged on the wheels. The distal ends of the two tensioning rods are respectively equipped with tensioning wheels 13-5, and the proximal ends of the two tensioning rods are hinged to the knife bar body by a pin shaft. The middle of each tensioning rod is connected to one end of the tensioning spring, and the other end of the tensioning spring is connected to the blade body. Two tensioning wheels protrude from the lower part of the blade body, and the tensioning wheels can rotate freely relative to the tensioning rod. During the scar scraping process, the two tensioning wheels touch and press the lower part of the inner wall of the steel pipe. In order to adapt to steel pipes of different diameters, the tensioning mechanism is also provided with two adjustment screws 13-7, each of which is screwed to the blade body, and the end of each adjustment screw touches and presses each tensioning rod respectively. Rotating the screw can adjust the upper and lower positions of the tensioning wheel to ensure that the tensioning wheel has a certain tensioning force to touch the inner wall of the steel pipe. A scar scraping knife shaft 13-9 is provided at the front of the blade body, and a ring-shaped scar scraping knife 13-3 is installed on the scar scraping knife shaft. A fixing screw 13-2 is provided on the side of the scar scraping knife shaft, and the fixing screw touches and presses the lower side of the scar scraping knife. The scar scraper shaft is tilted relative to the axial direction of the blade body, and the inclination angle B1 is 25°-35°. The blade diameter of the scar scraper matches the inner diameter of the processed steel pipe, and the inclination angle B2 of the blade surface of the scar scraper relative to the inner wall of the steel pipe is 15°-25°.

[0026] See also Figure 1 , Figure 5 , Figure 6, a work surface 11 is fixed on the upper part of the frame, and an adjustment surface 10 is also provided on the upper part of the work surface. The steel pipe fixing mechanism is installed on the adjustment surface, and two sets of steel pipe fixing mechanisms are provided to fix the two positions of the steel pipe respectively. Each steel pipe fixing mechanism includes a steel pipe support 9-2 and a quick pressing clamp 9-1 (commercially available). The steel pipe support is provided with a V-shaped groove for supporting the steel pipe, and the steel pipe is placed on the V-shaped groove and then pressed by the quick pressing clamp. The lower part of the steel pipe support is connected to the support frame 15, the upper part of the support frame passes through the fixed surface, and the top of the support frame is connected to the adjustment surface 10. The support frame is provided with a fixed block 15-1 and a height adjustment screw 15-2, the fixed block is fixedly connected to the work surface, the two sides of the fixed block are slidably matched with the support frame, the upper end of the height adjustment screw is connected to the height adjustment slider, the middle part of the height adjustment screw is threadedly matched with the bottom plate of the support frame, and the bottom of the height adjustment screw is provided with a height adjustment handle 15-3. The support frame and adjustment table are set to adapt to steel pipes of different diameters. When the diameter of the processed steel pipe changes, the height adjustment handle is rotated, and the support frame moves up (down) together with the steel pipe fixing mechanism. After proper adjustment, the position of the support frame is fixed by the top screw (not shown in the figure) set on the side of the frame. In addition, in order to adapt to the change in the length of the steel pipe, one set of the two sets of steel pipe fixing mechanisms close to the guide seat is fixed in position, and the position of the other set is adjustable. A bolt slide 10-1 is provided on the adjustment table, and the bolt passes through the bolt slide to fix the steel pipe support of the adjustable steel pipe fixing mechanism.

[0027] See also Figure 1 , Figure 5 The guide mechanism 8 is used to guide the movement of the cutter bar to ensure complete scar removal at the left end of the steel pipe. The guide mechanism is provided with a guide seat 8-2, a guide sleeve 8-1, a guide slider 8-3 and a guide slider adjustment screw 8-4. The guide seat is installed on a fixed table, the guide slider is located in the guide seat, the guide slider can slide up and down relative to the guide seat, the guide sleeve is installed in the guide slider, the bottom of the guide slider adjustment screw is connected to the guide slider, the middle of the guide slider adjustment screw is threaded with the guide seat top plate, and the upper part of the guide slider adjustment screw is provided with an adjustment handle 8-5. When processing steel pipes of different specifications, the upper and lower positions of the guide sleeve can be adjusted by rotating the adjustment handle so that the position of the guide sleeve corresponds to that of the steel pipe.

[0028] When the present invention is working, the steel pipe is first placed in the V-groove of the two steel pipe fixing mechanisms, and the left end of the steel pipe is close to the right end face of the guide sleeve to achieve the purpose of axial positioning. Note that the weld bead in the steel pipe should be placed upward, and the steel pipe is pressed by the quick pressing clamp; the motor rotates, drives the nut through the transmission mechanism, and the nut drives the pull rod to move right until the pull rod extends out of the right end of the steel pipe, and the motor stops; the pull rod and the scraping knife rod are connected, and the motor rotates in the opposite direction, drives the nut through the transmission mechanism, the nut drives the pull rod, and the pull rod drives the scraping knife rod to move left until the scraping knife is completely moved out of the left end of the steel pipe. The leftward movement process of the scraping knife rod realizes the scraping operation of the scraping knife on the weld bead nodule on the inner wall of the steel pipe; after the scraping is completed, the scraping knife rod moves right to reset, the pull rod is disengaged from the scraping knife rod, and the pull rod moves left to return to the initial position, and a working cycle is completed.

Claims

1. A device for scraping off weld nodules on the inner wall of a steel pipe, characterized in that: The machine comprises a frame (1), a motor (2), a transmission mechanism, a steel pipe fixing mechanism (9), a guide mechanism (8) and a scraping knife bar (13), wherein the transmission mechanism is provided with a lead screw pair, the lead screw pair, a first knife bar bracket (7), a guide mechanism, a steel pipe fixing mechanism and a second knife bar bracket (17) are arranged in sequence on the upper part of the frame, the motor is arranged at the lower part of one end of the frame, the motor drives a pull rod (12) through the transmission mechanism, and the pull rod drives the scraping knife bar to move linearly, the scraping knife bar probes into the inner hole of the steel pipe (16) to be processed, a scraping knife (13-3) is arranged on the scraping knife bar, a hook (12-1) arranged at the front end of the pull rod is connected to and drives the scraping knife bar (13) to move linearly, and the scraping knife cuts off the weld nodule on the inner wall of the steel pipe as the scraping knife bar moves; The scar scraping knife bar is provided with a knife bar body (13-10), an upper support wheel (13-1) and a tensioning mechanism. The rear end of the knife bar body is provided with a pull rod shaft (13-4) connected to the pull rod. The front end longitudinal section of the knife bar body is wedge-shaped. Two upper support wheels that can rotate freely are arranged. The two upper support wheels are respectively assembled on the front and rear sides of the knife bar body. The two upper support wheels protrude from the upper part of the knife bar body. The upper support wheels are provided with an annular groove. The middle part of the knife bar body is provided with a mounting groove for assembling the tensioning mechanism. The tensioning mechanism includes two tensioning rods (13-6) symmetrically arranged on the wheels. ) and two tensioning springs (13-8), the distal ends of the two tensioning rods are respectively provided with tensioning wheels (13-5), the proximal ends of the two tensioning rods are hinged to the knife bar body by a pin shaft, the middle part of each tensioning rod is connected to one end of the tensioning spring, the other end of the tensioning spring is connected to the knife bar body, and the two tensioning wheels protrude from the lower part of the knife bar body; a scar scraping knife shaft (13-9) is provided at the front part of the knife bar body, an annular scar scraping knife (13-3) is installed on the scar scraping knife shaft, a fixing screw (13-2) is provided beside the scar scraping knife shaft, and the fixing screw contacts and presses the lower side of the scar scraping knife; The scar scraping knife shaft is tilted relative to the axial direction of the knife rod body, and the inclination angle B1 is 25°-35°. The blade diameter of the scar scraping knife matches the inner diameter of the processed steel pipe, and the inclination angle B2 of the blade surface of the scar scraping knife relative to the inner wall of the steel pipe is 15°-25°; The tensioning mechanism is also provided with two adjusting top screws (13-7), each adjusting top screw is screw-connected to the knife bar body, and the end of each adjusting top screw contacts and presses each tensioning rod respectively; A work surface (11) is fixed on the upper part of the frame, an adjustment surface (10) is arranged on the upper part of the work surface, a steel pipe fixing mechanism is installed on the adjustment surface, two sets of steel pipe fixing mechanisms are arranged, each steel pipe fixing mechanism comprises a steel pipe support (9-2) and a quick pressing clamp (9-1), a V-shaped groove is arranged on the steel pipe support, the lower part of the steel pipe support is connected to a support frame (15), the upper part of the support frame passes through the work surface (11), and the top of the support frame is connected to the adjustment surface (10); The guide mechanism (8) is provided with a guide seat (8-2), a guide sleeve (8-1), a guide slider (8-3) and a guide slider adjustment screw (8-4); the guide seat is installed on the work surface (11); the guide slider is located in the guide seat; the guide slider can slide up and down relative to the guide seat; the guide sleeve is installed in the guide slider; the bottom of the guide slider adjustment screw is connected to the guide slider; the middle of the guide slider adjustment screw is threadedly matched with the guide seat top plate; the upper part of the guide slider adjustment screw is provided with an adjustment handle (8-5); the guide mechanism (8) is used to guide the movement of the cutter rod to ensure complete scar removal at the left end of the steel pipe; when processing steel pipes of different specifications, the adjustment handle can be rotated to adjust the upper and lower positions of the guide sleeve so that the positions of the guide sleeve and the steel pipe correspond; the left end of the steel pipe is close to the right end face of the guide sleeve (8-1) to achieve the purpose of axial positioning; The support frame is provided with a fixed block (15-1) and a height adjustment screw rod (15-2), the fixed block is connected to the work table, the two sides of the fixed block are slidably matched with the support frame, the upper end of the height adjustment screw rod is connected to the height adjustment slider, the middle part of the height adjustment screw rod is threadedly matched with the bottom plate of the support frame, and the bottom of the height adjustment screw rod is provided with a height adjustment handle (15-3).

2. The device for scraping off weld nodules on the inner wall of a steel pipe according to claim 1, characterized in that: The transmission mechanism is provided with a belt drive (3), which transmits the power of the motor to the lead screw (4) of the lead screw pair. The nut (5) of the lead screw pair is threadedly connected to the lead screw. A slider is fixed at the bottom of the nut. The slider is slidably matched with a slide rail (14) fixed on the frame, and the nut is connected to the pull rod.

3. The device for scraping off weld nodules on the inner wall of a steel pipe according to claim 1, characterized in that: Of the two sets of steel pipe fixing mechanisms, one set close to the guide seat is fixed in position, and the other set is adjustable in position. A bolt slide groove (10-1) is provided on the adjustment table, and bolts pass through the bolt slide groove to fix the steel pipe support of the adjustable steel pipe fixing mechanism.

4. The device for scraping off weld nodules on the inner wall of a steel pipe according to claim 1, characterized in that: It also includes a screw rod support frame (6), which is fixed to the upper part of the frame and supports the rod and the screw at the upper and lower parts respectively.

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