Method for grinding the inner wall of a seamless steel tube

Abstract

The present application relates to the technical field of seamless steel pipe manufacturing, in particular to a kind of grinding method for the inner wall of seamless steel pipe, which is completed by grinding device, the grinding device includes base, bracket is fixedly installed on the upper end surface of base, vertical slide rail is fixedly installed on the upper end surface of base and located behind bracket, positioning mechanism is arranged on base and vertical slide rail; the positioning mechanism, driving mechanism and limiting mechanism are used in cooperation, the grinding of seamless steel pipe of different sizes is completed by integrated operation model of positioning, adjusting and limiting, three-point synchronous rolling positioning is used to realize uniform and stable grinding of the inner wall of seamless steel pipe, three-point stable support provided by triangular structure is used to realize quick switching and positioning grinding of seamless steel pipe of different sizes, and grinding error is reduced under the accurate alignment of auxiliary positioning mechanism, which significantly improves the smoothness and overall quality of the inner wall of seamless steel pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of seamless steel pipe manufacturing, in particular to a seamless steel pipe inner wall grinding method. BACKGROUND

[0002] The seamless steel pipe is a kind of steel pipe manufactured by hot rolling or cold drawing process, which can provide higher strength and better pressure resistance, compared with the jointed steel pipe, the seamless steel pipe is more superior in aspects of bearing internal and external pressure, temperature change, corrosion resistance and fatigue resistance, etc.In the production of seamless steel pipe, in order to ensure the smoothness of the inner wall of the seamless steel pipe, the inner wall of the seamless steel pipe needs to be ground to reduce the frictional resistance of the fluid flowing in the pipe, thereby improving the conveying efficiency of the seamless steel pipe to the fluid.

[0003] In the process of grinding the inner wall of the seamless steel pipe, the seamless steel pipe is usually placed between the roll columns rolling in the same direction, then the upper end of the seamless steel pipe is extruded and positioned, so that the two roll columns support and drive the seamless steel pipe to rotate, and then the grinding head enters the seamless steel pipe to grind the inner wall.

[0004] But the above process has the following shortcomings: 1, when positioning the seamless steel pipe, no auxiliary locking is implemented between the upper end extrusion and the lower end support, the seamless steel pipe is prone to displacement during rotation, which leads to uneven grinding of the inner wall of the seamless steel pipe, affecting the final surface smoothness, and also causes the vibration of the seamless steel pipe, further affecting the grinding accuracy and surface quality; 2, when positioning the seamless steel pipe, the distance between the roll columns needs to be adjusted manually to adapt to seamless steel pipes of different sizes, and manual adjustment needs a certain operation time, so it will prolong the production efficiency of the inner wall grinding of the seamless steel pipe, and manual adjustment will have errors, which will lead to inaccurate distance between the roll columns, thereby affecting the fixing and rotating grinding effect of the seamless steel pipe. SUMMARY

[0005] In order to solve the above technical problems, the application provides a seamless steel pipe inner wall grinding method, which is completed by a grinding device, and the grinding device comprises a base, a bracket fixedly installed on the upper end surface of the base, a vertical slide rail fixedly installed on the upper end surface of the base and located at the rear of the bracket, and a positioning mechanism arranged on the base and the vertical slide rail; the positioning mechanism comprises an adjusting part arranged on the base, an upper positioning part arranged on the vertical slide rail and used for positioning and adjusting different sizes of seamless steel pipes, a stabilizing part arranged on the upper positioning part, and a grinding part arranged on the base; the adjusting part comprises symmetrically arranged slide channels at the front and rear of the bracket, symmetrically arranged first sliding blocks slidably installed in the slide channels, a bidirectional threaded rod rotatably installed in the slide channel at the rear side and threadedly connected with the corresponding symmetrically arranged first sliding blocks, and a central shaft rotatably installed through bearings and penetrating the first sliding blocks which are opposite to each other, and a first limiting roller fixedly sleeved on the central shaft and located between the first sliding blocks; the upper positioning part comprises a screw rod perpendicular to the bidirectional threaded rod, a second sliding block slidably installed on the front end surface of the vertical slide rail and threadedly connected with the screw rod, and a second limiting roller rotatably installed on the front end surface of the second sliding block through a rotating shaft; the base is provided with a driving mechanism for providing power for the adjusting part; the driving mechanism comprises a matching part arranged on the adjusting part, and a driving part arranged on the base and matched with the matching part; the bracket is provided with a limiting mechanism matched with the positioning mechanism; the limiting mechanism comprises a descending part arranged on the bracket, a supporting part arranged on the descending part, and a limiting part arranged on the descending part and matched with the grinding part; the descending part comprises an electric push rod, and a supporting horizontal plate fixedly installed on the extension end of the electric push rod and located above the second limiting roller; a first rolling plate is fixedly installed on the lower end surface of the supporting horizontal plate and located in front of the second limiting roller; a pressing arc plate is fixedly installed on the supporting rod and in rolling contact with the rotating shaft of the second limiting roller; and the supporting part comprises a second rolling plate located above the first limiting roller.

[0006] The method for grinding the inner wall of the seamless steel pipe by using the grinding device is as follows: first, the seamless steel pipe is placed on the upper ends of the first limiting rollers on the two sides; then, the first motor is started to rotate the bidirectional threaded rod, so that the first limiting rollers on the two sides are close to each other, and the second limiting roller moves in contact with the outer ring wall of the seamless steel pipe by rotating the screw rod through the first bevel gear set; during the movement, the stabilizing part, the second sliding block, the first sliding block and the bidirectional threaded rod form a stable triangular structure; then, the electric push rod is started to drive the supporting horizontal plate to descend until the first rolling plate presses the upper end of the outer ring wall of the seamless steel pipe; at this time, the pressing arc plate presses the upper side of the front end of the rotating shaft of the second limiting roller, and the second rolling plate presses the first limiting roller; then, the driving part and the driving part matching part drive the seamless steel pipe to rotate and the grinding part grinds the inner wall of the seamless steel pipe.

[0007] As a preferred technical scheme of the present application, the adjusting part comprises a slide, a first sliding block, a bidirectional threaded rod, a first motor, a central shaft and a first limiting roller, the upper end surface of the base is provided with a slide symmetrically about the front and back of the bracket, the slide is slidably installed with left and right symmetric first sliding blocks, the slide on the back side is installed with a bidirectional threaded rod through a bearing, the bidirectional threaded rod is threadedly connected with the corresponding left and right symmetric first sliding blocks, the upper surface of the base is fixedly installed with a first motor, the output end of the first motor is fixedly connected with the bidirectional threaded rod, and the central shaft is commonly installed through bearings between the front and back first sliding blocks, and the first limiting roller is fixedly sleeved on the central shaft between the first sliding blocks.

[0008] As a preferred technical scheme of the present application, the adjusting part comprises a slide, a first sliding block, a bidirectional threaded rod, a first motor, a central shaft and a first limiting roller, the upper end surface of the base is provided with a slide symmetrically about the front and back of the bracket, the slide is slidably installed with left and right symmetric first sliding blocks, the slide on the back side is installed with a bidirectional threaded rod through a bearing, the bidirectional threaded rod is threadedly connected with the corresponding left and right symmetric first sliding blocks, the upper surface of the base is fixedly installed with a first motor, the output end of the first motor is fixedly connected with the bidirectional threaded rod, and the central shaft is commonly installed through bearings between the front and back first sliding blocks, and the first limiting roller is fixedly sleeved on the central shaft between the first sliding blocks.

[0009] As a preferred technical scheme of the present application, the adjusting part comprises a slide, a first sliding block, a bidirectional threaded rod, a first motor, a central shaft and a first limiting roller, the upper end surface of the base is provided with a slide symmetrically about the front and back of the bracket, the slide is slidably installed with left and right symmetric first sliding blocks, the slide on the back side is installed with a bidirectional threaded rod through a bearing, the bidirectional threaded rod is threadedly connected with the corresponding left and right symmetric first sliding blocks, the upper surface of the base is fixedly installed with a first motor, the output end of the first motor is fixedly connected with the bidirectional threaded rod, and the central shaft is commonly installed through bearings between the front and back first sliding blocks, and the first limiting roller is fixedly sleeved on the central shaft between the first sliding blocks.

[0010] As a preferred technical scheme of the present application, the adjusting part comprises a slide, a first sliding block, a bidirectional threaded rod, a first motor, a central shaft and a first limiting roller, the upper end surface of the base is provided with a slide symmetrically about the front and back of the bracket, the slide is slidably installed with left and right symmetric first sliding blocks, the slide on the back side is installed with a bidirectional threaded rod through a bearing, the bidirectional threaded rod is threadedly connected with the corresponding left and right symmetric first sliding blocks, the upper surface of the base is fixedly installed with a first motor, the output end of the first motor is fixedly connected with the bidirectional threaded rod, and the central shaft is commonly installed through bearings between the front and back first sliding blocks, and the first limiting roller is fixedly sleeved on the central shaft between the first sliding blocks.

[0011] As a preferred technical scheme of the present application, the adjusting part comprises a slide, a first sliding block, a bidirectional threaded rod, a first motor, a central shaft and a first limiting roller, the upper end surface of the base is provided with a slide symmetrically about the front and back of the bracket, the slide is slidably installed with left and right symmetric first sliding blocks, the slide on the back side is installed with a bidirectional threaded rod through a bearing, the bidirectional threaded rod is threadedly connected with the corresponding left and right symmetric first sliding blocks, the upper surface of the base is fixedly installed with a first motor, the output end of the first motor is fixedly connected with the bidirectional threaded rod, and the central shaft is commonly installed through bearings between the front and back first sliding blocks, and the first limiting roller is fixedly sleeved on the central shaft between the first sliding blocks.

[0012] As a preferred technical scheme of the present application, the matching part comprises an L-shaped support plate and a spline sleeve, the spline shaft is slidably installed with left-right symmetrical spline sleeves, the spline sleeve is installed with the L-shaped support plate through a bearing, the rear end of the central shaft rod penetrates through the horizontal longitudinal section of the L-shaped support plate and is connected with the bearing of the L-shaped support plate, and the spline sleeve is drivingly connected with the corresponding central shaft rod through the second bevel gear set.

[0013] As a preferred technical scheme of the present application, the descending part comprises an electric push rod, a support transverse plate, a first rolling plate and a pressing arc plate, the L-shaped support is fixedly installed at the upper end with the electric push rod, the telescopic end of the electric push rod is fixedly installed with the support transverse plate above the second limiting roller, the lower end surface of the support transverse plate is fixedly installed with the first rolling plate through the support rod, the first rolling plate is located in front of the second limiting roller, and the support rod is fixedly installed with the pressing arc plate in rolling contact with the rotating shaft on the second limiting roller.

[0014] As a preferred technical scheme of the present application, the support part comprises a sliding cylinder, an L-shaped sliding rod, a telescopic sleeve and a second rolling plate, the sliding cylinder is fixedly and penetratively installed at the front and rear ends of the support transverse plate, the axis of the sliding cylinder extends from left to right, the L-shaped sliding rod is slidably installed at the left and right ends of the sliding cylinder, the telescopic sleeve is slidably installed at the vertical section of the L-shaped sliding rod, the lower end of the telescopic sleeve is fixedly installed with the second rolling plate above the first limiting roller, the lower end surfaces of the first rolling plate, the pressing arc plate and the second rolling plate are all distributed with a plurality of rolling balls in an array manner, and the telescopic sleeve is provided with a bolt for adjusting the distance between the second rolling plate and the support transverse plate.

[0015] As a preferred technical scheme of the present application, the limiting part comprises a first arc-shaped supporting block, an L-shaped connecting rod and a second arc-shaped supporting block, the first arc-shaped supporting block is fixedly installed on the upper end surface of the base and located at the rear end of the electric sliding rail, the upper end arc surface of the first arc-shaped supporting block is in contact with the outer ring wall of the extending rod, the front end of the support transverse plate is fixedly installed with the second arc-shaped supporting block above the first arc-shaped supporting block through the L-shaped connecting rod, and the mutually close arc surfaces of the second arc-shaped supporting block and the first arc-shaped supporting block are both distributed with a plurality of rolling balls in an array manner.

[0016] Compared with the prior art, the present application has the following advantages: 1. The positioning mechanism, the driving mechanism and the limiting mechanism are used in cooperation, the integrated operation model of positioning, adjustment and limiting is adopted to complete the grinding of seamless steel pipes of different sizes, three-point synchronous rolling positioning is adopted to realize uniform and stable grinding of the inner wall of the seamless steel pipe, three-point stable support provided by the triangular structure is used to realize quick switching and positioning grinding of seamless steel pipes of different sizes, and under the accurate positioning of the auxiliary positioning mechanism, the grinding error is reduced, and the smoothness and overall quality of the inner wall of the seamless steel pipe are significantly improved.

[0017] 2、The positioning mechanism is arranged, three-point synchronous rolling positioning is implemented to the outer ring wall of the seamless steel pipe before the grinding, uniform support points can be provided for the seamless steel pipe, the pressure generated in the grinding process can be better dispersed, the grinding of the inner wall of the seamless steel pipe is ensured to be uniform, the stability and accuracy of the seamless steel pipe in the grinding process are ensured, and then the smoothness and quality of the inner wall surface of the seamless steel pipe are improved.

[0018] 3、The positioning mechanism and the driving mechanism are used in cooperation, the seamless steel pipes with different sizes can be positioned and ground, different specifications of seamless steel pipes can be ground through quick switching, the device adjustment time is shortened, and therefore the flexibility and adaptability of the device are improved.

[0019] 4、The positioning mechanism and the limiting mechanism are used in cooperation, the triangular structure is used to provide stable support for three-point positioning, the stability of the seamless steel pipe during the grinding is ensured through the cooperation of the two, the positioning of the auxiliary positioning mechanism is ensured after the positioning is completed, the seamless steel pipe can be accurately centered during the grinding, the error in the grinding process is reduced, and the quality of the inner wall grinding of the seamless steel pipe is further improved. DETAILED DESCRIPTION

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the working of the application.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the working of the application.

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the working of the application. Figure 2 It is a schematic diagram of the three-dimensional structure of the working of the application.

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the working of the application.

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the working of the application.

[0025] In the figure: 1, base; 2, L-shaped support; 3, vertical sliding rail; 4, positioning mechanism; 41, adjusting part; 411, sliding channel; 412, first sliding block; 413, two-way threaded rod; 414, first motor; 415, central shaft; 416, first limiting roller; 42, upper positioning part; 421, screw rod; 422, second sliding block; 423, positioning rod; 424, second limiting roller; 43, stabilizing part; 431, supporting telescopic rod; 44, grinding part; 441, electric sliding rail; 442, moving sliding seat; 443, second motor; 444, extending rod; 445, grinding head; 5, driving mechanism; 51, matching part; 511, L-shaped support plate; 512, spline sleeve; 52, driving part; 521, spline shaft; 522, third motor; 6, limiting mechanism; 61, descending part; 611, electric push rod; 612, supporting cross plate; 613, first rolling plate; 614, pressing arc plate; 62, supporting part; 621, sliding cylinder; 622, L-shaped sliding rod; 623, telescopic sleeve; 624, second rolling plate; 63, limiting part; 631, first arc-shaped support block; 632, L-shaped connecting rod; 633, second arc-shaped support block. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0027] Please refer to Figure 1 and Figure 2 A seamless steel pipe inner wall grinding method is completed by a grinding device. The grinding device comprises a base 1. An L-shaped support 2 is fixedly installed on the upper end surface of the base 1. A vertical sliding rail 3 is fixedly installed on the upper end surface of the base 1 and located behind the L-shaped support 2. A positioning mechanism 4 for implementing three-point synchronous rolling positioning on the outer ring wall of a seamless steel pipe is arranged on the base 1 and the vertical sliding rail 3. The positioning mechanism 4 comprises an adjusting part 41 arranged on the base 1. An upper positioning part 42 for adjusting and positioning the adjusting part 41 and the upper positioning part 42 of the seamless steel pipe of different sizes is arranged on the vertical sliding rail 3. The upper positioning part 42 is provided with a stabilizing part 43 for positioning the adjusting part 41 and the upper positioning part 42 in a triangular support mode. A grinding part 44 for grinding the inner wall of the seamless steel pipe is arranged on the base 1.

[0028] Please refer to Figure 1 and Figure 2 A driving mechanism 5 for providing power for the adjusting part 41 is arranged on the base 1. The driving mechanism 5 comprises a matching part 51 arranged on the adjusting part 41. A driving part 52 matched with the matching part 51 is further arranged on the base 1.

[0029] Please refer to Figure 1 , the bracket 2 is provided with a limiting mechanism 6 matched with the positioning mechanism 4; the limiting mechanism 6 includes a descending part 61 provided on the bracket 2 and used for stably pressing the upper positioning part 42 on the upper end of the seamless steel pipe, the descending part 61 is provided with a supporting part 62 used for providing the descending part 61 with rolling support matched with the adjusting part 41, and the descending part 61 is further provided with a limiting part 63 used for matching the grinding part 44.

[0030] Please refer to Figure 1 , Figure 2 and Figure 4 , the adjusting part 41 includes a sliding groove 411, a first sliding block 412, a bidirectional screw rod 413, a first motor 414, a central shaft 415 and a first limiting roller 416, the upper end surface of the base 1 is provided with the sliding groove 411 symmetrical about the front and back of the bracket 2, the first sliding block 412 symmetrical about the left and right is slidably installed in the sliding groove 411, the bidirectional screw rod 413 threadedly connected with the corresponding first sliding block 412 symmetrical about the left and right is installed in the sliding groove 411 on the rear side through a bearing, the bidirectional screw rod 413 is provided with two thread segments with opposite thread directions, the first sliding blocks 412 symmetrically arranged in the sliding groove 411 are respectively threadedly connected with the two thread segments, the first motor 414 with the output end fixedly connected with the bidirectional screw rod 413 is fixedly installed on the base 1, the central shaft 415 is commonly installed through the bearings and penetrates between the first sliding blocks 412 which are opposite to each other in front and back, and the first limiting roller 416 located between the first sliding blocks 412 is fixedly sleeved on the central shaft 415.

[0031] Please refer to Figure 1 and Figure 4 , the upper positioning part 42 includes a screw rod 421, a second sliding block 422, a positioning rod 423 and a second limiting roller 424, the screw rod 421 perpendicular to the bidirectional screw rod 413 is rotatably installed on the front end surface of the vertical sliding rail 3 through a bearing seat, the second sliding block 422 threadedly connected with the screw rod 421 is slidably installed on the front end surface of the vertical sliding rail 3, the positioning rod 423 slidably penetrating the second sliding block 422 is fixedly installed on the front end surface of the vertical sliding rail 3, the bidirectional screw rod 413 and the screw rod 421 are drivingly connected through the first bevel gear set, and the second limiting roller 424 is rotatably installed on the front end surface of the second sliding block 422 through a rotating shaft.

[0032] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4The stabilizing part 43 comprises a supporting telescopic rod 431, the second sliding block 422 is symmetrically hinged with the supporting telescopic rod 431 at the left and right ends, one end of the supporting telescopic rod 431 away from the second sliding block 422 is hinged with the corresponding first sliding block 412, and a stable triangular structure is formed between the second sliding block 422, the supporting telescopic rods 431 at the left and right sides thereof, the corresponding first sliding blocks 412 at the left and right sides, and the bidirectional threaded rod 413.

[0033] In particular, when the inner wall of the seamless steel pipe needs to be polished, the seamless steel pipe to be polished is first placed on the upper end of the first limiting roller 416 on both sides, so that the two support the seamless steel pipe, and then the first motor 414 is started to rotate the bidirectional threaded rod 413, so that the first sliding block 412 on both sides with the corresponding first limiting roller 416 moves closer to each other.

[0034] At the same time, the bidirectional threaded rod 413 rotates the screw rod 421 through the first bevel gear set, and under the cooperation of the positioning rod 423 limiting the sliding direction, the second sliding block 422 with the second limiting roller 424 is lowered, and the second limiting roller 424 moves synchronously with the first limiting roller 416 on both sides, and the supporting telescopic rod 431 synchronously adapts to rotation and telescoping, when the second limiting roller 424 contacts the upper end of the outer ring wall of the seamless steel pipe, the positioning of the second limiting roller 424 and the first limiting roller 416 on both sides to the seamless steel pipe is completed at this time, so as to implement three-point synchronous rolling positioning on the outer ring wall of the seamless steel pipe, provide uniform support points for the seamless steel pipe, ensure uniform polishing of the inner wall of the seamless steel pipe, and can polish the seamless steel pipe of different sizes, improve the flexibility and adaptability of the production line.

[0035] At the same time, the second limiting roller 424 and the first limiting roller 416 on both sides roll and position the seamless steel pipe, and the second sliding block 422, the supporting telescopic rods 431 at the left and right sides thereof, the corresponding first sliding blocks 412 at the left and right sides, and the bidirectional threaded rod 413 still form a stable triangular structure, so as to provide stable support for three-point positioning, so that the seamless steel pipe is not easy to tilt or deform during polishing, thereby ensuring the stability of the seamless steel pipe during polishing.

[0036] Please refer to Figure 1 , Figure 2 and Figure 5 , the descending part 61 comprises an electric push rod 611, a supporting horizontal plate 612, a first rolling plate 613 and a pressing arc plate 614, the electric push rod 611 is fixedly installed on the upper end of the H-shaped support 2, the telescopic end of the electric push rod 611 is fixedly installed with the supporting horizontal plate 612 above the second limiting roller 424, the first rolling plate 613 is fixedly installed on the lower end surface of the supporting horizontal plate 612 through the supporting rod, the first rolling plate 613 is located in front of the second limiting roller 424, and the supporting rod is fixedly installed with the pressing arc plate 614 in rolling contact with the rotating shaft on the second limiting roller 424.

[0037] Please refer to Figure 1 , Figure 2 and Figure 5 , the support part 62 includes a sliding cylinder 621, an L-shaped slide rod 622, a telescopic sleeve 623 and a second rolling plate 624, the sliding cylinder 621 is fixed and penetrates the front and rear ends of the support transverse plate 612, the axis of the sliding cylinder 621 extends from left to right, the L-shaped slide rod 622 is symmetrically and slidingly installed at the left and right ends of the sliding cylinder 621, the telescopic sleeve 623 is slidingly installed on the vertical section of the L-shaped slide rod 622, the second rolling plate 624 is fixedly installed at the lower end of the telescopic sleeve 623 and located above the first limiting roller 416, a plurality of balls (not shown in the figure) are arranged in an array on the lower end surface of the first rolling plate 613, the pressing arc plate 614 and the second rolling plate 624, and a bolt is arranged on the telescopic sleeve 623 for adjusting the distance between the second rolling plate 624 and the support transverse plate 612.

[0038] In specific work, after the positioning of the seamless steel pipe is completed, the electric push rod 611 is started to drive the telescopic end to lower the support transverse plate 612, and when the first rolling plate 613 is pressed on the outer ring wall of the seamless steel pipe, the operation of the electric push rod 611 is stopped, at this time, the pressing arc plate 614 exerts a downward extrusion force on the front end of the rotating shaft of the second limiting roller 424, so that the second limiting roller 424 more stably extrudes the seamless steel pipe on the first limiting roller 416 below, at the same time, the second rolling plate 624 is in rolling contact with the first limiting roller 416, at this time, the second rolling plate 624 cooperates with the first limiting roller 416 to provide support for the support transverse plate 612, so that after the positioning is completed, the positioning of the auxiliary positioning mechanism 4 is assisted by downward extrusion, so as to ensure that the seamless steel pipe can be accurately centered during the grinding, reduce the error in the grinding process, further improve the quality of the grinding of the inner wall of the seamless steel pipe, and the pressing actions of the pressing arc plate 614 and the second rolling plate 624 also limit the rotating shaft of the second limiting roller 424 and the first limiting roller 416 respectively, and the bolt arranged on the telescopic sleeve 623 is used for adjusting the distance between the second rolling plate 624 and the support transverse plate 612.

[0039] Please refer to Figure 1 , Figure 2 and Figure 4 , the driving part 52 includes a spline shaft 521 and a third motor 522, the spline shaft 521 is rotatably installed on the upper end surface of the base 1 and located behind the rear slide 411 through a bearing seat, and the third motor 522 is fixedly installed on the upper end surface of the base 1 and the output end thereof is fixedly connected with the spline shaft 521.

[0040] Please refer to Figure 1 , Figure 2 and Figure 4The matching part 51 comprises an L-shaped support plate 511 and a spline sleeve 512. The spline sleeves 512 symmetrically arranged on the left and right of the spline shaft 521 are slidably installed on the spline shaft 521. The L-shaped support plate 511 is installed on the spline sleeves 512 through bearings. The rear end of the central shaft 415 penetrates the horizontal longitudinal section of the L-shaped support plate 511 and is connected with the L-shaped support plate 511 through bearings. The spline sleeves 512 are connected with the corresponding central shaft 415 through the second bevel gear set.

[0041] In specific work, after the positioning of the seamless steel pipe is completed, the third motor 522 is started to drive the spline shaft 521 to rotate, and the spline shaft 521 drives the spline sleeves 512 on the left and right sides to rotate synchronously. The spline sleeves 512 drive the first limiting rollers 416 on the left and right sides to rotate synchronously through the second bevel gear set, so that the seamless steel pipe rotates in the rotating direction of the first limiting rollers 416, and cooperates with the grinding part 44 to perform grinding operation on the inner wall of the seamless steel pipe. In the process of horizontal movement of the first limiting roller 416, the first limiting roller 416 drives the spline sleeves 512 to slide on the spline shaft 521 through the L-shaped support plate 511.

[0042] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the grinding part 44 comprises an electric sliding rail 441, a moving sliding seat 442, a second motor 443, an extension rod 444 and a grinding head 445. The electric sliding rail 441 is fixedly installed on the front side of the front sliding way 411 on the upper end surface of the base 1. The moving sliding seat 442 is fixedly installed on the moving end of the electric sliding rail 441. The second motor 443 is fixedly installed on the upper end of the moving sliding seat 442. The extension rod 444 is installed on the rear end surface of the moving sliding seat 442 through bearings. The extension rod 444 is connected with the second motor 443 through the first gear set. The grinding head 445 is fixedly installed on the rear end of the extension rod 444.

[0043] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 , the limiting part 63 comprises a first arc-shaped support block 631, an L-shaped connecting rod 632 and a second arc-shaped support block 633. The first arc-shaped support block 631 is fixedly installed on the rear end of the electric sliding rail 441 on the upper end surface of the base 1. The upper end arc surface of the first arc-shaped support block 631 is in contact with the outer ring wall of the extension rod 444. The second arc-shaped support block 633 is fixedly installed on the front end of the support horizontal plate 612 through the L-shaped connecting rod 632 and is located directly above the first arc-shaped support block 631. The mutually close arc surfaces of the second arc-shaped support block 633 and the first arc-shaped support block 631 are both arranged with a plurality of balls in an array.

[0044] Specifically, after the auxiliary positioning of the seamless steel pipe is completed, the second motor 443 is started to rotate the extension rod 444 through the first gear set, thereby rotating the polishing head 445, then the electric sliding rail 441 is started to move the moving slide 442 towards the inside of the seamless steel pipe, so that the polishing head 445 continuously moves towards the rear end of the seamless steel pipe through rotation, and the polishing head 445 continuously grinds the lower side of the inner wall of the seamless steel pipe, and cooperates with the rotation of the seamless steel pipe to change the position of the inner wall of the seamless steel pipe, thereby completing the grinding of the inner wall of the seamless steel pipe.

[0045] During the descent of the support horizontal plate 612, the second arc-shaped support block 633 is in contact with the upper end of the first arc-shaped support block 631 through the L-shaped connecting rod 632, so that the second arc-shaped support block 633 is combined with the first arc-shaped support block 631 to provide additional rolling support for the extension rod 444, thereby avoiding shaking of the extension rod 444 during rotation.

[0046] After the grinding is completed, the electric push rod 611 is started in reverse to lift the support horizontal plate 612 away from the seamless steel pipe, then the first motor 414 is started in reverse to move the second limiting roller 424 and the first limiting rollers 416 on both sides away from the seamless steel pipe, at this time the seamless steel pipe with completed grinding can be taken out.

[0047] Please refer to Figures 1-5 The above grinding device grinds the inner wall of the seamless steel pipe by the following method: when it is necessary to grind the inner wall of the seamless steel pipe, first, the seamless steel pipe to be ground is placed on the upper end of the first limiting rollers 416 on both sides, the three-point synchronous rolling positioning is performed on the outer ring wall of the seamless steel pipe by cooperation of the adjusting part 41 and the upper positioning part 42, the stable part 43 provides triangular stable support for the three-point synchronous rolling positioning, then the electric push rod 611 is started to press the positioning of the auxiliary positioning mechanism 4 downward through the limiting mechanism 6.

[0048] Then the third motor 522 is started to synchronously rotate the first limiting rollers 416 on both sides through the driving mechanism 5, thereby rotating the seamless steel pipe in the rotation direction of the first limiting rollers 416, then the second motor 443 is started to rotate the polishing head 445, then the electric sliding rail 441 is started to move the moving slide 442 towards the inside of the seamless steel pipe, so that the polishing head 445 continuously moves towards the rear end of the seamless steel pipe through rotation, and the polishing head 445 continuously grinds the lower side of the inner wall of the seamless steel pipe, and cooperates with the rotation of the seamless steel pipe to change the position of the inner wall of the seamless steel pipe, thereby completing the grinding of the inner wall of the seamless steel pipe.

[0049] After the grinding is completed, the electric push rod 611 is started in reverse to lift the support horizontal plate 612 away from the seamless steel pipe, then the first motor 414 is started in reverse to move the second limiting roller 424 and the first limiting rollers 416 on both sides away from the seamless steel pipe, at this time the seamless steel pipe with completed grinding can be taken out.

[0050] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous changes, modifications, substitutions and variations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A method for grinding the inner wall of a seamless steel tube, which is performed by means of a grinding device comprising a base, characterized in that: A U-shaped bracket is fixedly installed on the upper surface of the base, and a vertical slide rail located behind the U-shaped bracket is fixedly installed on the upper surface of the base. A positioning mechanism is provided on both the base and the vertical slide rail. The positioning mechanism includes an adjustment part set on the base, an upper fixing part set on the vertical slide rail for positioning and adjusting seamless steel pipes of different sizes, a stabilizing part set on the upper fixing part, and a grinding part set on the base. The adjustment section includes symmetrical slides about the front and rear of the U-shaped bracket. The first sliders symmetrically mounted on the left and right are slidably installed in the slides. The double-threaded rods that are threadedly connected to the corresponding first sliders symmetrically mounted on the left and right are installed in the slide on the rear side through bearings. A central shaft is installed through the first sliders that are directly opposite each other at the front and rear through bearings. A first limiting roller located between the first sliders is fixedly sleeved on the central shaft. The upper fixed part includes a screw perpendicular to the bidirectional threaded rod, and a second slider that is threadedly connected to the screw is slidably installed on the front end face of the vertical slide rail. The bidirectional threaded rod and the screw are connected by a first bevel gear set. A second limit roller is rotatably installed on the front end face of the second slider through a rotating shaft. The base is provided with a drive mechanism that provides power to the adjustment part; the drive mechanism includes a mating part provided on the adjustment part, and the base is also provided with a drive part that mates with the mating part; The U-shaped bracket is provided with a limiting mechanism that cooperates with the positioning mechanism; the limiting mechanism includes a descending part provided on the U-shaped bracket, a supporting part provided on the descending part, and a limiting part for cooperating with the grinding part on the descending part. The descending part includes an electric push rod, and a support plate located above the second limiting roller is fixedly installed at the telescopic end of the electric push rod. A first rolling plate located in front of the second limiting roller is fixedly installed on the lower end face of the support plate through a support rod. A pressing arc plate that rolls in contact with the rotating shaft on the second limiting roller is fixedly installed on the support rod. The support part includes a second rolling plate located above the first limiting roller. The stabilizing part includes support telescopic rods that are symmetrically hinged at the left and right ends of the second slider. The end of the support telescopic rod away from the second slider is hinged to the corresponding first slider. The second slider, the support telescopic rods on its left and right sides, the corresponding left and right first sliders, and the bidirectional threaded rod form a stable triangular structure. The method for grinding the inner wall of the seamless steel pipe by the grinding device is as follows: after the seamless steel pipe is placed on the upper ends of the first limiting rollers on both sides, the first motor drives the bidirectional threaded rod to rotate, so that the first limiting rollers on both sides are close to each other, meanwhile, the bidirectional threaded rod rotates the screw rod through the first bevel gear set, so that the second limiting roller moves synchronously with the first limiting roller to contact the outer ring wall of the seamless steel pipe, then the electric push rod drives the supporting horizontal plate to descend until the first rolling plate abuts against the upper end of the outer ring wall of the seamless steel pipe, at this time, the abutting arc plate abuts against the upper side of the front end of the rotating shaft of the second limiting roller, the second rolling plate abuts against the first limiting roller, then the driving part and the matching part are matched to rotate the seamless steel pipe and grind the inner wall of the seamless steel pipe by the grinding part.

2. A method of inner wall dressing of a seamless steel pipe according to claim 1, characterized in that: The slide is arranged on the upper end surface of the base, and the first motor fixedly connected with the bidirectional threaded rod is fixedly installed on the base.

3. The method of claim 1, wherein: The screw rod is rotatably installed on the front end surface of the vertical slide rail through the bearing seat, and the positioning rod fixedly installed on the front end surface of the vertical slide rail slides through the second sliding block.

4. The method of claim 1 wherein: The moving end of the electric slide rail is fixedly installed with the moving sliding seat, the second motor is fixedly installed on the upper end of the moving sliding seat, the extension rod is installed on the rear end surface of the moving sliding seat through the bearing, the extension rod and the second motor are transmissionally connected through the first gear set, and the polishing head is fixedly installed on the rear end of the extension rod.

5. The method of claim 1 wherein: The driving part includes the spline shaft and the third motor, the spline shaft is rotatably installed on the rear side of the slide through the bearing seat, and the third motor fixedly connected with the spline shaft is fixedly installed on the upper end surface of the base.

6. The method of claim 5, wherein: The matching part includes the L-shaped supporting plate and the spline sleeve, the spline sleeve is symmetrically installed on the spline shaft, the L-shaped supporting plate is installed on the spline sleeve through the bearing, the rear end of the central shaft rod penetrates the horizontal longitudinal section of the L-shaped supporting plate and is connected with the bearing of the L-shaped supporting plate, and the spline sleeve and the corresponding central shaft rod are transmissionally connected through the second bevel gear set.

7. The method of claim 1 wherein: The electric push rod is fixedly installed on the upper end of the L-shaped support.

8. The method of claim 1 wherein: The lower end surfaces of the first rolling plate, the abutting arc plate and the second rolling plate are distributed with a plurality of balls in an array mode, and the expansion sleeve is provided with the bolt for adjusting the distance between the second rolling plate and the supporting horizontal plate.

9. The method of claim 4 wherein: The limiting part includes the first arc supporting block, the L-shaped connecting rod and the second arc supporting block, the first arc supporting block is fixedly installed on the rear end of the electric slide rail on the upper end surface of the base, the upper end arc surface of the first arc supporting block is in contact with the outer ring wall of the extension rod, the second arc supporting block is fixedly installed on the front end of the supporting horizontal plate through the L-shaped connecting rod and is located directly above the first arc supporting block, and the arc surfaces of the second arc supporting block and the first arc supporting block, which are close to each other, are distributed with a plurality of balls in an array mode.

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