A vertical inner wall polishing device for steel pipes

Abstract

This invention discloses an internal wall polishing device for vertically placed steel pipes, belonging to the technical field of polishing equipment. It includes a placement frame and cross-shaped sanding discs. The placement frame is equipped with a clamping mechanism and a moving frame. The polishing rod includes a connector and several connecting pipes. The connector is connected to the output end of a drive assembly. Two limiting rods are slidably installed inside the connecting pipes, and the two limiting rods are connected by a second elastic element. The connector and connecting pipes, as well as adjacent connecting pipes, are engaged by the limiting rods. The cross-shaped sanding discs are inserted into the connecting pipes. Cross-shaped sanding discs are installed at the connection points between the connector and connecting pipes, and at the connection points between two connecting pipes. Employing a double-sided, multi-station clamping design, it can simultaneously fix 10 parallel vertical steel pipes. Combined with a double-end synchronous feed polishing structure, compared to the traditional single-pipe, single-end polishing mode, the single-batch processing capacity is increased tenfold, and the polishing cycle of a single steel pipe is shortened by more than 50%, fully adapting to the production capacity requirements of large-scale steel pipe processing scenarios.

Description

Technical Field

[0001] This invention relates to the field of polishing equipment technology, and more specifically, to an inner wall polishing device for vertically placed steel pipes. Background Technology

[0002] With the rapid development of precision machinery, hydraulic transmission, new energy fluid transportation, and high-end chemical industries, the market demand for high-precision seamless steel pipes has been increasing year by year. After hot rolling and cold drawing, seamless steel pipes generally have residual defects such as oxide scale, micro-pits, and burrs on their inner walls. These defects need to be reduced through inner wall polishing processes to eliminate the surface roughness and forming defects in order to meet the requirements of downstream applications for media flow efficiency, corrosion resistance, and assembly precision.

[0003] Existing steel pipe inner wall polishing equipment is mostly a single-station design, capable of processing only one steel pipe at a time, and most only support single-end feed polishing, resulting in extremely low processing efficiency and failing to meet the capacity requirements of large-scale mass production. Secondly, the polishing equipment generally uses a fixed installation structure for the cross-shaped sand discs. When a single cross-shaped sand disc is damaged, the adjacent sand discs must be disassembled before the specific cross-shaped sand disc can be replaced, resulting in extremely low maintenance efficiency. Some integrated polishing rods even need to be scrapped and replaced entirely, significantly increasing maintenance costs. Furthermore, the installation spacing of existing sand discs is a fixed value, making it impossible to adjust the sand disc distribution density according to the different steel pipe inner wall roughness requirements and polishing texture process requirements. If process parameters need to be adjusted, only the entire polishing rod with the preset corresponding spacing can be replaced, resulting in high spare parts costs and long process adjustment cycles. In view of this, a vertically placed steel pipe inner wall polishing device is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide an inner wall polishing device for vertically placed steel pipes, which solves at least one of the technical problems mentioned above.

[0005] This invention provides an inner wall polishing device for vertically placed steel pipes, including a placement frame and several cross sand discs, with several clamping mechanisms and several movable frames installed on the placement frame.

[0006] Several drive components are mounted on the mobile frame;

[0007] Several polishing rods, including connectors and several connecting tubes, the connectors are connected to the output end of the drive assembly, two limiting rods are slidably installed in the connecting tubes, the two limiting rods are connected by a second elastic element, the connectors and connecting tubes and two adjacent connecting tubes are snapped together by the limiting rods, cross sanding discs are inserted into the connecting tubes, and cross sanding discs are installed at the connection between the connectors and connecting tubes and at the connection between two connecting tubes.

[0008] The moving frame drives the drive assembly to move, and the drive assembly drives the polishing rod to move and rotate, so that the cross-shaped sanding discs are inserted from both ends of the steel pipe to polish the inner wall of the steel pipe in both directions.

[0009] As a further description of the above technical solution, an adjusting tube is rotatably installed inside the connecting tube, a second ring tooth is installed on the adjusting tube, and two wedges are installed inside the adjusting tube;

[0010] The connecting pipe is fitted with a double-headed ring tooth, the outer diameter of which is adapted to the inner diameter of the connecting pipe. A fixing rod is installed on the double-headed ring tooth, and an adjustment hole is opened on the connecting pipe, through which the fixing rod passes.

[0011] As a further description of the above technical solution, a connecting plate is installed on the fixing rod, the connecting plate is locked to the connecting pipe by fasteners, and a limit strip is fixedly installed on the wedge block.

[0012] As a further description of the above technical solution, a first ring tooth is rotatably installed inside the connecting pipe, a threaded rod is installed on the first ring tooth, an extension block that is screwed to the threaded rod is slidably installed on the connecting pipe, and a limiting rod is engaged with the extension block to assemble two adjacent connecting pipes.

[0013] As a further description of the above technical solution, the double-headed ring tooth is located between the first ring tooth and the second ring tooth, and the three are coaxial.

[0014] As a further description of the above technical solution, the axial length of the adjusting hole is not less than the maximum displacement of the double-headed ring tooth between the first ring tooth and the second ring tooth.

[0015] As a further description of the above technical solution, a limit block and a locking block are fixedly connected to the limit rod;

[0016] The cross-shaped sand disc has a cross groove, and the limiting rod is inserted into the cross groove. The height of the limiting block is less than the height of the locking block.

[0017] As a further description of the above technical solution, it also includes a support wheel installed on the movable frame, a limit wheel slidably installed on the mounting frame of the support wheel, and a first elastic element connected to the limit wheel installed on the mounting frame of the support wheel;

[0018] The drive assembly includes a second motor mounted on a movable frame. The output end of the second motor is connected to a transmission rod, which is rotatably connected to the movable frame on which the second motor is mounted. The transmission rod is placed on a support wheel and is limited by a limiting wheel.

[0019] As a further description of the above technical solution, a reflux trough and a liquid storage tank are installed at the bottom of the placement rack. A pump body is installed in the liquid storage tank. A delivery pipe connected to the pump body is installed on the placement rack. Several spray pipes are connected to the delivery pipe.

[0020] As a further description of the above technical solution, the placement rack is equipped with several telescopic cylinders, the output end of the telescopic cylinders is connected to a pipe cover, the pipe cover is slidably connected to the placement rack, and a guide hole is opened on the pipe cover. The diameter of the guide hole is larger than that of the transmission rod, and the transmission rod passes through the guide hole.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] 1. This invention adopts a double-sided multi-station clamping design, which can simultaneously fix 10 parallel vertical steel pipes. Combined with a double-end synchronous feed polishing structure, compared with the traditional single-pipe single-end polishing mode, the single batch operation capacity is increased by 10 times, and the polishing cycle of a single steel pipe is shortened by more than 50%, which can fully adapt to the production capacity requirements of large-scale steel pipe processing scenarios.

[0023] 2. The polishing rod of this invention adopts a modular and splicable design, which can arbitrarily increase or decrease the number of connecting pipes according to the length of the steel pipe to be processed. At the same time, the adjustable structure of the extension block supports the adjustment of the spacing between adjacent cross sand discs. It can adapt to the processing needs of different lengths, different inner wall roughness requirements and different polishing texture processes without replacing the whole machine parts, and the coverage of the scene is far greater than that of traditional fixed length polishing rods.

[0024] 3. The cross-shaped grinding disc of this invention adopts a tool-free quick-installation structure. The grinding head can be replaced simply by pressing the limiting rod. The connecting pipe at any end can be disassembled. When it is necessary to replace part of the cross-shaped grinding disc, the corresponding cross-shaped grinding disc can be accurately positioned and disassembled, thus eliminating the drawback of the traditional cross-shaped grinding disc requiring overall replacement when it is worn. The disassembly of the connecting pipe is relatively easy, reducing the labor intensity of the operator.

[0025] 4. The polishing fluid of this invention adopts a closed-loop circulation system. Polishing fluid that is not injected into the steel pipe or overflows is automatically returned to the storage tank for reuse after being filtered by the return tank, which greatly reduces the loss of polishing fluid. In conjunction with the pipe cap sealing structure at the end of the steel pipe, it can prevent polishing fluid and metal chips from splashing during high-speed polishing, which keeps the work site dry and clean, and also reduces on-site safety hazards and subsequent cleaning costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a vertically placed steel pipe inner wall polishing device according to a preferred embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram showing the location of the liquid storage tank in a vertically placed steel pipe inner wall polishing device according to a preferred embodiment of the present invention.

[0028] Figure 3 A preferred embodiment of the present invention discloses a vertically placed steel pipe inner wall polishing device. Figure 1 Enlarged view of point A in the middle;

[0029] Figure 4 A preferred embodiment of the present invention discloses a vertically placed steel pipe inner wall polishing device. Figure 1 Enlarged view at point B in the middle;

[0030] Figure 5 This is a schematic diagram of the pipe cover connection structure of an inner wall polishing device for vertically placed steel pipes, as disclosed in a preferred embodiment of the present invention.

[0031] Figure 6 This is a schematic diagram of the cross-shaped sanding disc installation position of a vertically placed steel pipe inner wall polishing device according to a preferred embodiment of the present invention.

[0032] Figure 7 This is a partial cross-sectional view of an inner wall polishing device for vertically placed steel pipes, as disclosed in a preferred embodiment of the present invention.

[0033] Figure 8 This is a schematic diagram of the connector structure of a vertically placed steel pipe inner wall polishing device according to a preferred embodiment of the present invention.

[0034] Figure 9 This is a schematic diagram of the connecting pipe connection structure of a vertically placed steel pipe inner wall polishing device according to a preferred embodiment of the present invention.

[0035] Figure 10 This is a schematic diagram of the ring tooth position of an inner wall polishing device for vertically placed steel pipes, as disclosed in a preferred embodiment of the present invention.

[0036] Figure 11 This is a schematic diagram of the wedge block installation position of an inner wall polishing device for vertically placed steel pipes, disclosed in a preferred embodiment of the present invention.

[0037] Figure 12 This is a schematic diagram of the fixing rod position of a vertically placed steel pipe inner wall polishing device according to a preferred embodiment of the present invention.

[0038] Figure 13 This is a schematic diagram of the cross-shaped sand disc structure of a vertically placed steel pipe inner wall polishing device disclosed in a preferred embodiment of the present invention.

[0039] Figure 14 This is a schematic diagram of the cross-shaped sanding disc engagement of a vertically placed steel pipe inner wall polishing device, as disclosed in a preferred embodiment of the present invention.

[0040] Explanation of the numbers in the diagram: 1. Placement frame; 11. Clamping mechanism; 12. Return channel; 13. Liquid storage tank; 14. Pump body; 15. Delivery pipe; 16. Spray pipe; 2. Moving frame; 21. Moving plate; 22. Rack; 23. First motor; 24. Gear; 3. Support wheel; 31. Limiting wheel; 32. First elastic element; 4. Telescopic cylinder; 41. Pipe cap; 42. Guide rod; 43. Guide hole; 5. Drive assembly; 51. Second motor; 52. Transmission rod; 6. Polishing rod; 61. Connector; 62. Connecting pipe; 63. First guide groove; 64. First limiting groove; 65. Guide post; 66. Limiting rod; 67. Second elastic element; 68. Limiting block; 69. Locking block; 610. Adjusting tube; 611. First ring tooth; 612. Second ring tooth; 613. Wedge block; 614. Limiting strip; 615. Double-headed ring tooth; 616. Fixing rod; 617. Adjusting hole; 618. Locking bolt; 619. Threaded rod; 620. Extension block; 621. Second guide groove; 622. Second limiting groove; 7. Cross sand disc; 71. Cross groove. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Reference Figures 1 to 14 This embodiment discloses an internal wall polishing device for vertically placed steel pipes, including a placement frame 1. Several clamping mechanisms 11 are installed on the placement frame 1. Each clamping mechanism 11 includes a cylinder and a clamping block installed at the cylinder's output end. The cylinder drives the clamping block to clamp and fix the placed steel pipes. In this embodiment, through the clamping mechanisms 11, the placement frame 1 can simultaneously clamp 5 steel pipes on one side, and a total of 10 steel pipes on both sides. The steel pipes on the same side are parallel to each other after clamping and are arranged vertically, enabling simultaneous polishing of multiple sets of steel pipes and improving polishing efficiency. A return trough 12 and a liquid storage tank 13 are installed at the bottom of the placement frame 1. A pump body 14 is installed inside the liquid storage tank 13. A delivery pipe 15 connected to the pump body 14 is installed on the placement frame 1, and several spray pipes 16 are connected to the delivery pipe 15. Pump body 14 transports polishing liquid in storage tank 13 through delivery pipe 15. Polishing liquid flows out from spray pipe 16 into the steel pipe to be processed to assist polishing. Polishing liquid that does not enter the steel pipe or overflows from the steel pipe falls into return tank 12. After being filtered by filter screen, it re-enters storage tank 13 to realize the recycling of polishing liquid.

[0043] Reference Figure 1 and Figure 4A plurality of movable frames 2 are mounted on a placement rack 1, with movable frames 2 distributed on both sides of the placement rack 1. Each movable frame 2 includes a movable plate 21. The movable plates 21 are arranged in parallel and slidably mounted on the placement rack 1. A plurality of racks 22 are fixedly mounted on the placement rack 1. A first motor 23 is fixedly mounted on each movable plate 21. A gear 24 is fixedly connected to the output end of the first motor 23, and the gear 24 meshes with the racks 22 for transmission. The output end of the first motor 23 drives the gear 24 to rotate, and through meshing with the racks 22, it drives the movable plates 21 to slide on the placement rack 1, thereby adjusting the position of the movable plates 21.

[0044] Reference Figure 3 The polishing device also includes several support wheels 3, which are mounted on the movable plate 21. A limit wheel 31 is slidably mounted on the mounting bracket of the support wheel 3. The limit wheel 31 is located directly above the support wheel 3. A first elastic element 32 is mounted on the mounting bracket of the support wheel 3. The first elastic element 32 is used to drive the limit wheel 31 to move towards the support wheel 3.

[0045] Reference Figure 3 and Figure 5 Several telescopic cylinders 4 are installed on the placement frame 1. The output end of the telescopic cylinder 4 is connected to a pipe cap 41. The pipe cap 41 is slidably connected to the placement frame 1 through a guide rod 42. The pipe cap 41 has a guide hole 43, which is coaxial with the clamped steel pipe. Each clamped steel pipe has a pipe cap 41 at both ends. After the steel pipe is clamped, the output end of the telescopic cylinder 4 drives the pipe cap 41 to press against the end of the steel pipe, thereby preventing the polishing liquid inside the steel pipe from flowing out quickly and preventing the polishing liquid from splashing during high-speed polishing, thus keeping the work area clean.

[0046] Reference Figure 1 , Figure 4 and Figure 5The polishing device also includes several drive components 5. Each drive component 5 includes a second motor 51 fixedly mounted on a movable plate 21. The output end of the second motor 51 is connected to a transmission rod 52. The transmission rod 52 is rotatably connected to the movable plate 21 on which the second motor 51 is mounted. The transmission rod 52 is placed on a support wheel 3 of equal height and is limited by a limiting wheel 31. When the movable frame 2 with the support wheel 3 is mounted moves, it can adjust the support position of the support wheel 3 on the transmission rod 52, reduce the risk of bending when the transmission rod 52 rotates, and improve the stability of the transmission rod 52 when rotating. The transmission rod 52 passes through a guide hole 43, and the diameter of the guide hole 43 is larger than that of the transmission rod 52. After the steel pipe is clamped and fixed, and the pipe cap 41 abuts against the end of the steel pipe, the liquid outlet end of the spray pipe 16 is aligned with the guide hole 43 of the pipe cap 41. When the polishing liquid is sprayed out from the spray pipe 16, it can enter the steel pipe through the guide hole 43 for auxiliary polishing, thereby improving the polishing effect of the inner wall of the steel pipe. A polishing rod 6 is installed at the end of the transmission rod 52. Each steel pipe has a drive assembly 5 and a polishing rod 6 at both ends. The moving frame 2 drives the drive assembly 5 and the polishing rod 6 to be inserted into the steel pipe from both ends at the same time, so as to realize the double-end synchronous polishing operation and improve the polishing efficiency.

[0047] Reference Figure 3 , Figures 6 to 14 The polishing rod 6 includes a connector 61 and several connecting tubes 62. The connector 61 is fixedly installed at the end of the transmission rod 52, such as by screwing, snapping, or limiting pin connection, which enables the connector 61 to be disassembled. The connector 61 has a first guide groove 63 and a first limiting groove 64, which are connected. A guide post 65 is fixedly installed inside the connecting tube 62. Two limiting rods 66 are slidably installed on the guide post 65. A second elastic element 67 is fitted on the guide post 65. The second elastic element 67 is used to push the two limiting rods 66 to move in opposite directions, so that the limiting rods 66 abut against the inner wall of the connecting tube 62. A limiting block 68 and a locking block 69 are fixedly connected to the limiting rods 66. When the limiting block 68 is snapped into the first limiting groove 64 from the first guide groove 63, the connecting tube 62 and the connector 61 are snapped and fixed. After snapping, the locking block 69 is located in the first guide groove 63.

[0048] Reference Figures 9 to 12 An adjusting tube 610 and a first ring tooth 611 are rotatably installed inside the connecting tube 62. A second ring tooth 612 is fixedly connected to the adjusting tube 610. The first ring tooth 611, the second ring tooth 612, and the connecting tube 62 are coaxial. Two wedges 613 are fixedly installed inside the adjusting tube 610. The adjusting tube 610 drives the wedges 613 to press... Figure 11When rotated counterclockwise from a mid-range angle, the wedge 613 can push the two limiting rods 66 towards the center of the connecting pipe 62 and compress the second elastic element 67, thereby adjusting the distance between the two limiting rods 66; when the two limiting rods 66 are fully extended, the clockwise rotation of the wedge 613 will be restricted by the limiting rods 66 and cannot be rotated; a limiting strip 614 is fixedly installed on the wedge 613, and when the tail end of the wedge 613 rotates to the locking position abutting against the side of the limiting rod 66, such as Figure 11 In the middle position, the limiting strip 614 will limit the radial movement of the limiting rod 66. At this time, the two limiting rods 66 cannot reduce the distance between them, ensuring that the connector 61 and the connecting tube 62 are stable after being inserted.

[0049] Reference Figure 9 , Figure 10 and Figure 12 A double-headed ring tooth 615 is fitted inside the connecting pipe 62. The outer diameter of the double-headed ring tooth 615 is adapted to the inner diameter of the connecting pipe 62. The double-headed ring tooth 615 is located between the first ring tooth 611 and the second ring tooth 612, and all three are coaxial. A fixing rod 616 is fixedly installed on the double-headed ring tooth 615. An adjustment hole 617 is provided on the connecting pipe 62. The axial length of the adjustment hole 617 is not less than the movable displacement of the double-headed ring tooth 615 between the first ring tooth 611 and the second ring tooth 612. The fixing rod 616 passes through the adjustment hole 617. When the double-headed ring tooth 615 moves axially, it can engage with the first ring tooth 611 or the second ring tooth 612. When the ring tooth 612 engages, if the fixing rod 616 moves to the leftmost side of the adjusting hole 617, the double-headed ring tooth 615 engages with the first ring tooth 611. When the fixing rod 616 moves to the rightmost side of the adjusting hole 617, the double-headed ring tooth 615 engages with the second ring tooth 612. When the fixing rod 616 moves to the middle of the adjusting hole 617, the double-headed ring tooth 615 is in an idle state and does not engage with either the first ring tooth 611 or the second ring tooth 612. When the double-headed ring tooth 615 is rotated circumferentially by the fixing rod 616, the first ring tooth 611 or the second ring tooth 612 that engages with the double-headed ring tooth 615 can rotate accordingly.

[0050] A connecting plate is fixedly installed on the fixing rod 616, and a locking bolt 618 is screwed onto the connecting plate. When the wedge block 613 is located at... Figure 11 When in position, the fixed rod 616 moves to Figure 11 When the adjustment hole 617 is in position, the double-headed ring tooth 615 and the second ring tooth 612 are engaged. The locking bolt 618 is locked into the connecting pipe 62 to fix the double-headed ring tooth 615. At this time, the limiting rod 66 is limited by the limiting strip 614 and cannot move centripetally, thus ensuring the stability of the connection between the connecting pipe 62 and the connector 61 during the polishing operation.

[0051] Reference Figure 9A threaded rod 619 is fixedly installed on the first ring tooth 611. An extension block 620 is slidably installed on the end of the connecting pipe 62 away from the limiting rod 66. The extension block 620 is threadedly connected to the threaded rod 619. The extension block 620 has a second guide groove 621 and a second limiting groove 622, which are connected. When the limiting block 68 on one connecting pipe 62 is engaged with the second limiting groove 622 corresponding to the second guide groove 621 of the other connecting pipe 62, the two connecting pipes 62 are spliced. The extension block 620 has two adjustment modes. In mode one, the polishing rod 6 is in the disassembled state, and the extension length of the extension block 620 is controlled by manually turning the threaded rod 619 with a tool. In mode two, the double-headed ring tooth 615 is controlled to engage with the first ring tooth 611. By controlling the rotation of the double-headed ring tooth 615, the threaded rod 619 is rotated, thereby adjusting the extension length of the extension block 620 when the two connecting pipes 62 are assembled.

[0052] Reference Figure 13 and Figure 14 The polishing device also includes several cross-shaped sanding discs 7. Each cross-shaped sanding disc 7 has a cross-shaped groove 71. A limiting rod 66 engages with the cross-shaped groove 71. When the distance between the two limiting rods 66 decreases, the cross-shaped sanding disc 7 can be inserted into the limiting rod 66 through the cross-shaped groove 71 and pass over the locking block 69. When the two limiting rods 66 elastically return to their original position, the locking block 69 can limit and fix the cross-shaped sanding disc 7 to the end of the connecting pipe 62, ensuring the stability of the cross-shaped sanding disc 7. It should be noted that the height of the limiting block 68 is less than the height of the locking block 69. During the process of the limiting block 68 being inserted into the limiting groove, the locking block 69 never disengages from the cross-shaped sanding disc 7, thus ensuring the stability of the cross-shaped sanding disc 7 installation process and reducing the installation difficulty. The connecting pipe 62, by engaging with the extension block 620, can increase or decrease the number of cross-shaped sanding discs 7 installed. By adjusting the extension length of the extension block 620, the distance between two adjacent cross-shaped sanding discs 7 can be controlled to meet different polishing process requirements.

[0053] Working principle: The steel pipes to be polished are arranged on the workstation of the placement frame 1. The cylinder pushes the clamping block to move, clamping 5 parallel steel pipes on one side at the same time, and a total of 10 steel pipes can be fixed on both sides. All steel pipes are kept in a vertical and coaxial state. This stage, through the multi-station parallel design, lays the foundation for subsequent batch polishing, directly increasing the working capacity by 10 times compared with the traditional single-pipe polishing mode.

[0054] After clamping, the telescopic cylinder 4 drives the pipe cover 41 to slide along the guide rod 42 until it abuts against both ends of the steel pipe, thereby sealing the ends of the steel pipe and preventing the polishing liquid from splashing and overflowing during the polishing process.

[0055] As the pipe cap 41 moves toward the end of the steel pipe, the moving frame 2 synchronously adjusts the positions of the drive assembly 5 and the polishing rod 6: the first motor 23 drives the gear 24 to rotate, and through meshing with the rack 22 fixed on the placement frame 1, it drives the moving plate 21 to slide along the placement frame 1. The support wheel 3 and the limiting wheel 31 mounted on the moving plate 21 jointly support the transmission rod 52, and the first elastic element 32 pushes the limiting wheel 31 to press the transmission rod 52, thereby achieving radial limiting of the transmission rod 52. By adjusting the positions of multiple sets of moving frames 2, the distribution of support points of the support wheel 3 on the transmission rod 52 can be changed, which greatly reduces the risk of bending deformation when the long transmission rod 52 rotates at high speed and improves rotational stability.

[0056] A polishing rod 6 is pre-installed at the front end of the transmission rod 52. The axis of the polishing rod 6 is coaxial with the axis of the steel pipe, the pipe cover 41, and the guide hole 43. The moving frame 2 drives the drive assembly 5 to feed as a whole, so that the polishing rod 6 is inserted into the inside of the steel pipe through the guide hole 43. Polishing rods 6 are inserted simultaneously at both ends of each steel pipe to achieve double-end counter-polishing and improve polishing efficiency.

[0057] Before the polishing operation begins, the pump 14 in the storage tank 13 is started, and the polishing liquid is delivered to the spray pipes 16 at each station through the delivery pipe 15. The outlet end of the spray pipe 16 is aligned with the guide hole 43 of the pipe cover 41. The polishing liquid is injected into the steel pipe under pressure, which cools and lubricates the polishing area on the one hand, and washes away the metal debris generated during polishing on the other hand, so as to prevent the debris from scratching the polished surface.

[0058] Polishing fluid that does not enter the steel pipe or overflows from the end of the steel pipe falls naturally into the return tank 12 at the bottom of the placement rack 1. After being filtered by the filter screen to remove impurities, it flows back to the storage tank 13, realizing the closed-loop recycling of polishing fluid, reducing consumable costs while keeping the work site dry and clean.

[0059] The second motor 51 starts, driving the transmission rod 52 to rotate at high speed, which in turn drives the front polishing rod 6 and the cross-shaped abrasive disc 7 to rotate synchronously. The moving frame 2 feeds continuously at a uniform speed, ensuring that the rotating cross-shaped abrasive disc 7 makes full contact with the inner wall of the steel pipe, thereby reducing the roughness of the inner wall through the grinding action of the abrasive grains. When both polishing rods 6 operate simultaneously, the feed speed and rotation parameters at both ends can be adjusted to achieve uniform polishing of the entire length of the inner wall of the steel pipe, avoiding defects such as over-polishing at the ends or insufficient polishing in the middle.

[0060] During the polishing process, the cap 41 remains in contact with the end of the steel pipe, effectively blocking the high-speed rotating polishing liquid and debris from splashing. At the same time, the gap between the guide hole 43 and the transmission rod 52 allows the polishing liquid to flow smoothly into the steel pipe, ensuring cooling and rinsing effects.

[0061] The polishing rod 6 adopts a modular design that allows for easy assembly. Its length and the number of grinding heads can be flexibly adjusted according to the length of the steel pipe and the requirements of the polishing process. The adjustment mechanism is as follows:

[0062] The connector 61 is fixed to the end of the transmission rod 52. The limiting rod 66 of the connecting tube 62 is inserted along the first guide groove 63, so that the limiting block 68 is locked into the first limiting groove 64, thereby realizing the quick fixing of the connecting tube 62 and the connector 61 and preventing the connecting tube 62 from axially coming out. At this time, the locking block 69 is located in the first guide groove 63.

[0063] Connecting pipe 62 splicing: The limiting rod 66 of the previous connecting pipe 62 is inserted into the second guide groove 621 of the extension block 620 of the next connecting pipe 62. After it is locked into the second limiting groove 622, multiple connecting pipes 62 can be spliced ​​in series. The number of connecting pipes 62 can be increased arbitrarily according to the length of the steel pipe.

[0064] When it is necessary to adjust the spacing between adjacent cross-shaped sanding discs 7, push the fixing rod 616 to engage the double-headed ring tooth 615 with the first ring tooth 611. Rotate the fixing rod 616 to rotate the first ring tooth 611 and the threaded rod 619, driving the extension block 620 to slide axially, thereby adjusting the spacing. When the spacing of the cross-shaped sanding discs 7 is adjusted to a larger extent, after a single adjustment, move the fixing rod 616 to the middle of the adjustment hole 617. At this time, the double-headed ring tooth 615 is separated from the first ring tooth 611 and the second ring tooth 612. Then, rotate the fixing rod 616 in the opposite direction to the reset state, and then push the fixing rod 616 to engage the double-headed ring tooth 615 with the first ring tooth 611. Repeating the above actions can achieve a longer displacement adjustment of the extension block 620, meeting the process requirements of different polishing textures. After the adjustment is completed, the fixing rod 616 is reset to the original position. Figure 12 In the middle position, the double-headed ring tooth 615 engages with the second ring tooth 612. After the locking bolt 618 of the locking rod 616 is tightened, the limiting strip 614 on the wedge block 613 restricts the radial movement of the limiting rod 66, further ensuring the stability of the splicing structure during high-speed rotation.

[0065] Installation of cross sanding disc 7: Press the limiting rod 66 to reduce the gap, insert the cross groove 71 of the cross sanding disc 7 into the limiting rod 66, and release the limiting rod 66 after passing the locking block 69. The second elastic element 67 pushes the limiting rod 66 to reset, and the locking block 69 fixes the cross sanding disc 7 axially. The grinding head can be quickly replaced without additional tools.

[0066] After the polishing operation is completed, the second motor 51 stops rotating, the moving frame 2 drives the polishing rod 6 to be pulled out of the steel pipe, the telescopic cylinder 4 drives the pipe cover 41 to reset and disengage from the end of the steel pipe, and the cylinder of the clamping mechanism 11 retracts to release the steel pipe, thus completing the unloading of the finished product.

[0067] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A polishing device for the inner wall of a vertically placed steel pipe, characterized in that: It includes a placement rack (1) and several cross sand discs (7). Several clamping mechanisms (11) and several movable racks (2) are installed on the placement rack (1). Several drive components (5) are mounted on the mobile frame (2); Several polishing rods (6) include a connector (61) and several connecting tubes (62). The connector (61) is connected to the output end of the drive assembly (5). Two limiting rods (66) are slidably installed inside the connecting tubes (62). The two limiting rods (66) are connected by a second elastic element (67). The connector (61) and the connecting tube (62) and two adjacent connecting tubes (62) are snapped together by the limiting rods (66). A cross sanding disc (7) is inserted into the connecting tube (62). A cross sanding disc (7) is installed at the connection between the connector (61) and the connecting tube (62) and at the connection between two connecting tubes (62). An adjusting pipe (610) is rotatably installed inside the connecting pipe (62). A second ring tooth (612) is installed on the adjusting pipe (610), and two wedges (613) are installed inside the adjusting pipe (610). The connecting pipe (62) is fitted with a double-headed ring tooth (615), the outer diameter of the double-headed ring tooth (615) is adapted to the inner diameter of the connecting pipe (62), a fixing rod (616) is installed on the double-headed ring tooth (615), and an adjustment hole (617) is opened on the connecting pipe (62), and the fixing rod (616) passes through the adjustment hole (617). The connecting pipe (62) is rotatably installed with a first ring tooth (611), and a threaded rod (619) is installed on the first ring tooth (611). An extension block (620) that is screwed to the threaded rod (619) is slidably installed on the connecting pipe (62). A limiting rod (66) is engaged with the extension block (620) to assemble two adjacent connecting pipes (62). A limiting block (68) and a locking block (69) are fixedly connected to the limiting rod (66). The cross sand disc (7) has a cross groove (71) and the limiting rod (66) is inserted into the cross groove (71). The height of the limiting block (68) is less than the height of the locking block (69). The moving frame (2) drives the drive assembly (5) to move, and the drive assembly (5) drives the polishing rod (6) to move and rotate, so that the cross sand disc (7) is inserted from both ends of the steel pipe to polish the inner wall of the steel pipe in both directions.

2. The internal wall polishing device for vertically placed steel pipes according to claim 1, characterized in that: A connecting plate is installed on the fixing rod (616), and the connecting plate is locked to the connecting pipe (62) by fasteners. A limit strip (614) is fixedly installed on the wedge (613).

3. The inner wall polishing device for vertically placed steel pipes according to claim 1, characterized in that: The double-headed ring tooth (615) is located between the first ring tooth (611) and the second ring tooth (612), and the three are coaxial.

4. The inner wall polishing device for vertically placed steel pipes according to claim 1, characterized in that: The axial length of the adjustment hole (617) is not less than the maximum displacement of the double-headed ring tooth (615) between the first ring tooth (611) and the second ring tooth (612).

5. A vertically mounted steel pipe inner wall polishing device according to any one of claims 1-4, characterized in that: The polishing device also includes a support wheel (3) mounted on a movable frame (2), a limit wheel (31) slidably mounted on the mounting frame of the support wheel (3), and a first elastic element (32) connected to the limit wheel (31) mounted on the mounting frame of the support wheel (3). The drive assembly (5) includes a second motor (51) mounted on a movable frame (2). The output end of the second motor (51) is connected to a transmission rod (52). The transmission rod (52) is rotatably connected to the movable frame (2) on which the second motor (51) is mounted. The transmission rod (52) is placed on a support wheel (3) and is limited by a limiting wheel (31).

6. The inner wall polishing device for vertically placed steel pipes according to claim 5, characterized in that: The bottom of the placement rack (1) is equipped with a return trough (12) and a liquid storage tank (13). A pump body (14) is installed in the liquid storage tank (13). A delivery pipe (15) connected to the pump body (14) is installed on the placement rack (1). Several spray pipes (16) are connected to the delivery pipe (15).

7. The inner wall polishing device for vertically placed steel pipes according to claim 6, characterized in that: The placement rack (1) is equipped with several telescopic cylinders (4). The output end of the telescopic cylinder (4) is connected to a pipe cover (41). The pipe cover (41) is slidably connected to the placement rack (1). A guide hole (43) is opened on the pipe cover (41). The diameter of the guide hole (43) is larger than that of the transmission rod (52). The transmission rod (52) passes through the guide hole (43).

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