Device and method for polishing inner wall of slender stainless steel pipe

Abstract

The device and method for polishing the inner wall of a slender stainless steel pipe belong to the technical field of polishing the inner wall of a stainless steel pipe, and the purpose is to solve the problems of low polishing efficiency, poor polishing surface quality, uneven wall thickness, long polishing time or inability to polish in the prior art. The device for polishing the inner wall of a slender stainless steel pipe of the present invention comprises: a bracket; a feed pipe, one end of which is connected to one end of the pipe to be polished; a discharge pipe, one end of which is connected to the other end of the pipe to be polished, the pipe to be polished is filled with magnetic abrasive, and polishing liquid is injected into the pipe to be polished through the feed pipe and discharged through the discharge pipe; a polishing transmission unit arranged on the bracket to drive the pipe to be polished to reciprocate along the length direction; and a magnetic polishing unit to drive the magnetic abrasive in the pipe to be polished. The present invention is applicable to the inner wall of all pipe diameters that can be placed with magnetic abrasives, and the pipe diameter is any pipe diameter above 1 mm. The overall structure of the present invention is simple, and the operation is convenient, and the purpose of polishing can be achieved without special training.

Description

Technical Field

[0001] The invention belongs to the technical field of inner wall polishing of slender small-diameter stainless steel pipes, and in particular relates to an inner wall polishing device and method of a slender stainless steel pipe. Background Art

[0002] In the fields of national defense, pharmaceuticals, electronics, petrochemicals, biology, food, etc., the use of slender anti-corrosion steel pipes (small diameter) has gradually become popular. Due to the special structure of this slender anti-corrosion steel pipe, higher requirements are put forward for the rust removal of the inner surface of the steel pipe, the surface accuracy quality, and the size and position tolerance. The natural defects caused by the manufacture of pipe blanks, such as the roughness of the inner and outer wall surfaces, grooves, and oxide layers, the large errors in the wall thickness, roundness, and coaxiality of the round pipe, cannot meet the strict use requirements of various industries. At the same time, due to the small diameter (diameter 1-30mm) and the long length of the round pipe (the longest is 7m), the traditional polishing technology is not only inefficient, but also powerless to polish the inner wall of stainless steel pipes with a diameter of less than 20mm, and cannot effectively remove the oxide layer, improve the surface quality, effectively reduce the wall thickness, and improve the inner and outer roundness and coaxiality. The small-diameter stainless steel pipes used in many industries need to be purchased from abroad, or the second best option is to use stainless steel precision rolled pipes with lower size and surface accuracy instead, resulting in low quality of products used and bearing such pipe fittings, affecting market competitiveness. Summary of the invention

[0003] The purpose of the present invention is to provide a device and method for polishing the inner wall of a slender stainless steel pipe, so as to solve the problems of low polishing efficiency, poor polishing surface quality, uneven wall thickness, long polishing time or failure to polish existing in the prior art.

[0004] To achieve the above-mentioned purpose, the inner wall polishing device of the slender stainless steel tube of the present invention comprises:

[0005] Bracket;

[0006] A feed pipe, one end of which is connected to one end of the tube to be ground;

[0007] A discharge pipe, one end of which is connected to the other end of the tube to be ground, the tube to be ground is filled with magnetic abrasive, polishing liquid is injected into the tube to be ground through the feed pipe, and discharged through the discharge pipe;

[0008] A polishing transmission unit arranged on the bracket and driving the pipe to be polished to reciprocate along the length direction;

[0009] And a magnetic polishing unit for driving the magnetic abrasive in the tube to be polished to move.

[0010] The polishing device further comprises an axis fine-tuning vibration unit, and the axis fine-tuning vibration unit comprises:

[0011] A slide table is arranged on the bracket, the slide table and the pipe to be ground are arranged in parallel, and the slide table and the lower end of the magnetic polishing unit are slidably matched;

[0012] A fine-tuning motor is arranged on the bracket;

[0013] A cam connected to the output shaft of the fine-tuning motor;

[0014] And two cam top blocks are arranged in parallel, the two cam top blocks are fixed at the lower end of the magnetic polishing unit, and the cam is located between the two cam top blocks.

[0015] The polishing device further comprises a straightening unit, wherein the straightening unit comprises two groups arranged symmetrically, each group comprising:

[0016] A straightening frame arranged on the bracket, wherein an arc-shaped groove is arranged on the upper surface of the straightening frame;

[0017] A straightening guide sleeve is arranged in the arc groove on the straightening frame, the straightening guide sleeve and the arc groove axis of the straightening frame are parallel, and the straightening guide sleeve is matched with the pipe to be ground;

[0018] And a pressing block, wherein the lower surface of the pressing block is provided with an arc groove, the arc groove on the lower surface of the pressing block cooperates with the straightening guide sleeve, and the pressing block is threadedly connected with the straightening frame.

[0019] The polishing device also includes a waste liquid filtration recovery box, and the waste liquid filtration recovery box includes:

[0020] A box body disposed at the lower part of the bracket;

[0021] A partition is arranged in the box body, the middle of the partition is opened, and the box body is divided into a filter chamber and a recovery chamber by the partition, the other end of the discharge pipe is connected to the filter chamber, and the feed pipe is connected to the recovery chamber through a water pump;

[0022] A first filter screen disposed on the middle opening of the partition;

[0023] and a second filter screen and a third filter screen arranged in sequence from top to bottom above the filter cavity, wherein the second filter screen and the third filter screen are both located above the first filter screen;

[0024] The mesh number of the first filter is 80-2000 mesh;

[0025] The mesh number of the second filter is 4-60 meshes;

[0026] The mesh number of the third filter is 20-160 meshes.

[0027] The second filter screen and the third filter screen are both arranged to tilt downward from the side in contact with the partition plate to the side opposite to the partition plate.

[0028] The polishing transmission unit comprises:

[0029] Two sets of transmission structures are symmetrically arranged on the bracket, and the tube to be ground is frictionally driven by the transmission structures; the two sets of transmission structures are connected and synchronously driven by a second conveyor belt;

[0030] And a transmission motor is arranged on the bracket, and the transmission motor is connected with any one of the two transmission structures through a first conveyor belt.

[0031] Each group of the transmission structure comprises:

[0032] A transmission frame disposed on the bracket;

[0033] The transmission shafts at both ends are arranged on the transmission frame through bearings, the transmission shafts of the two transmission structures are connected through a second transmission belt, and the transmission shaft of any one transmission structure and the output shaft of the transmission motor are connected through a first transmission belt;

[0034] A transmission wheel coaxially fixedly connected to the transmission shaft, wherein a groove is provided in the middle of the transmission wheel, the pipe to be ground is located in the groove, and the depth of the groove is smaller than the outer diameter of the pipe to be ground;

[0035] and a roller wheel which is arranged parallel to the axis of the transmission wheel, and the pipe to be ground is located between the transmission wheel and the roller wheel.

[0036] The magnetic polishing unit comprises:

[0037] A polishing frame, a cam top block of the axis fine-tuning vibration unit is located on the lower end surface of the polishing frame, and the polishing frame and the slide table of the axis fine-tuning vibration unit are slidably matched;

[0038] A polishing motor disposed on the polishing frame;

[0039] And a rotating magnetic pole coaxially arranged with the polishing motor, the rotating magnetic pole includes a magnetic pole frame arranged on the polishing frame, a rotating shaft rotatably matched with the magnetic pole frame, a magnetic seat with a through hole in the middle at one end of the rotating shaft, and a plurality of magnetic strips located in the magnetic seat; the output shaft of the polishing motor and the other end of the rotating shaft are connected by a third conveyor belt; the circumference of the plurality of magnetic strips is adjusted to be enlarged or reduced by an aperture adjustment device.

[0040] The end of the feed pipe and the end of the discharge pipe are both provided with an inverted cone-shaped sealing rubber plug, and the inverted cone-shaped sealing rubber plug comprises:

[0041] A fixed tube connected to a feed tube or a discharge tube at one end, wherein the outer surface of the other end of the fixed tube is an inverted cone structure, and the side close to the other end is a large-size end;

[0042] And an adjustment seat sleeved on the fixed tube, the adjustment seat includes an adjustment ring and an adjustment cylinder coaxially fixedly connected to the adjustment ring, the adjustment cylinder is located on the side close to the inverted cone structure, and the sum of the outer diameter of the large-size end of the inverted cone structure and the two wall thicknesses of the adjustment cylinder is greater than the inner wall of the tube to be ground.

[0043] The polishing method based on the inner wall polishing device of the slender stainless steel pipe comprises the following steps:

[0044] Step 1: Install the pipe to be ground on the polishing device;

[0045] Step 2: Send the polishing liquid and magnetic abrasive to the rotating magnetic pole of the magnetic polishing unit, connect one end of the tube to be polished to the feed pipe, and the other end to the discharge pipe, and the other end of the feed pipe is connected to the water pump and connected to the recovery chamber of the waste liquid filter recovery box;

[0046] Step 3: Adjust the rotating magnetic poles so that the distance between the inner surface of the circle where the multiple magnetic strips are located and the outer surface of the tube to be ground is 2-50mm;

[0047] Step 4: Turn on the polishing motor to rotate the rotating magnetic pole and adjust the speed of the polishing motor to 50-10000r / min;

[0048] Step 5: Turn on the transmission motor, and the roller and the transmission wheel roll and rotate to move the pipe to be ground axially, so as to straighten the pipe to be ground and polish the inner wall of the entire pipe fitting;

[0049] Step 6: Disassemble the pipe to be ground and complete the polishing.

[0050] The beneficial effects of the present invention are as follows: the inner wall polishing device of the slender stainless steel tube of the present invention realizes the transmission of the tube to be polished through the polishing transmission unit, a mixture of polishing liquid and magnetic abrasive is introduced into the tube to be polished, and the magnetic abrasive is driven to move by the rotational movement of the magnetic polishing unit, thereby realizing the polishing effect; the magnetic abrasive and polishing liquid are mixed into the tube to be polished, which can assist and enhance the polishing effect, and at the same time can eliminate the removed materials on the polishing surface; the magnetic abrasive does not move with the flow of the polishing liquid due to the attraction of the magnetic pole. The polishing of a specific position can be achieved under the control of an external magnetic polishing unit; a straightening unit is also provided during the polishing process, and the straightening unit can be provided to straighten the slightly deformed pipe to be polished during the polishing process, thereby reducing the number of steps, improving efficiency, and ensuring the quality of the pipe to be polished; the axis fine-tuning vibration unit of the present invention can quickly and slightly adjust the axial position of the overall magnetic polishing unit, thereby achieving fine-tuning of the axial position of the magnetic abrasive, and better ensuring the polishing effect. In addition, the present invention also includes a waste liquid filtration recovery box, through which the used polishing liquid can be filtered and then reused, thereby improving the utilization rate of the polishing liquid and reducing costs. The present invention is applicable to the inner walls of all pipe diameters that can accommodate magnetic abrasives, and any pipe diameter above 1 mm is applicable. Small diameter refers to a diameter of 1-300 mm. The present invention has a simple overall structure and is easy to operate, and the purpose of polishing can be achieved without special training. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A perspective view of the inner wall polishing device of an elongated stainless steel tube according to the present invention;

[0052] Figure 2 It is a three-dimensional view of the inner wall polishing device of the slender stainless steel pipe of the present invention from another perspective;

[0053] Figure 3 It is a front view of the inner wall polishing device of the slender stainless steel tube of the present invention;

[0054] Figure 4 It is a schematic structural diagram of a straightening unit and an axis fine-tuning vibration unit in the inner wall polishing device of an elongated stainless steel tube of the present invention;

[0055] Figure 5 It is a schematic structural diagram of a polishing transmission unit and a magnetic polishing unit in the polishing device for the inner wall of an elongated stainless steel tube of the present invention;

[0056] Figure 6 It is a schematic structural diagram of a magnetic polishing unit in the inner wall polishing device of an elongated stainless steel tube of the present invention;

[0057] Figure 7 It is a schematic diagram of the structure of the inverted cone-shaped sealing rubber plug in the inner wall polishing device of the slender stainless steel tube of the present invention;

[0058] Figure 8It is an exploded view of the structure of the inverted cone-shaped sealing rubber plug in the inner wall polishing device of the slender stainless steel tube of the present invention;

[0059] Fig. 9 It is a schematic diagram of the structure of the waste liquid filtering and recovery box in the slender stainless steel tube inner wall polishing device of the present invention;

[0060] Among them: 1. bracket, 2. feed pipe, 3. pipe to be ground, 4. discharge pipe, 5. polishing transmission unit, 501. transmission motor, 502. first conveyor belt, 503. second conveyor belt, 504. transmission frame, 505. transmission shaft, 506. transmission wheel, 507. roller, 6. magnetic polishing unit, 601. polishing frame, 602. polishing motor, 603. rotating magnetic pole, 604. magnetic pole frame, 605. rotating shaft, 606. magnetic seat, 607. magnetic strip, 608. third conveyor belt, 7. axis fine-tuning vibration unit, 701. fine-tuning motor , 702, cam, 703, cam top block, 704, slide, 8, straightening unit, 801, straightening frame, 802, straightening guide sleeve, 803, pressing block, 9, waste liquid filter recovery box, 901, box body, 902, partition, 903, first filter screen, 904, filter chamber, 905, recovery chamber, 906, second filter screen, 907, third filter screen, 10, water pump, 11, inverted cone sealing plug, 1101, fixed tube, 1102, inverted cone structure, 1103, adjustment seat, 1104, adjustment ring, 1105, adjustment cylinder. DETAILED DESCRIPTION

[0061] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0062] See attached Figure 1 -Attached Fig. 9 The inner wall polishing device of the slender stainless steel tube of the present invention comprises:

[0063] Bracket 1;

[0064] A feed pipe 2, one end of which is connected to one end of the tube to be ground 3;

[0065] A discharge pipe 4, one end of which is connected to the other end of the tube to be ground 3, the tube to be ground 3 is filled with magnetic abrasive, polishing liquid is injected into the tube to be ground 3 through the feed pipe 2, and discharged through the discharge pipe 4;

[0066] A polishing transmission unit 5 disposed on the bracket 1 and driving the pipe to be polished 3 to reciprocate along the length direction;

[0067] And a magnetic polishing unit 6 for driving the magnetic abrasive in the tube 3 to be polished.

[0068] The polishing device further comprises an axis fine-tuning vibration unit 7, and the axis fine-tuning vibration unit 7 comprises:

[0069] A slide 704 is arranged on the bracket 1, the slide 704 and the pipe to be polished 3 are arranged in parallel, and the slide 704 and the lower end of the magnetic polishing unit 6 are slidably matched;

[0070] A fine-tuning motor 701 is arranged on the bracket 1;

[0071] A cam 702 connected to the output shaft of the fine-tuning motor 701;

[0072] And two parallel cam top blocks 703, the two cam top blocks 703 are fixed at the lower end of the magnetic polishing unit 6, and the cam 702 is located between the two cam top blocks 703. When the cam 702 rotates at a high speed, the top end of the cam 702 acts on the opposite arc surfaces of the two cam top blocks 703 by mutual friction, and the cam 702 contacts the two cam top blocks 703 respectively. Through the rotation of the cam 702 and the contact with the cam top blocks 703, the reciprocating vibration of the magnetic polishing unit 6 along the length direction of the tube 3 to be polished is realized.

[0073] The polishing device further comprises a straightening unit 8, wherein the straightening unit 8 comprises two symmetrically arranged groups, each group comprising:

[0074] A straightening frame 801 disposed on the bracket 1, wherein an arc groove is disposed on the upper surface of the straightening frame 801;

[0075] A straightening guide sleeve 802 is disposed in the arc groove on the straightening frame 801, wherein the straightening guide sleeve 802 and the arc groove axis of the straightening frame 801 are parallel, and the straightening guide sleeve 802 cooperates with the pipe to be ground 3;

[0076] And a pressing block 803, wherein an arc groove is arranged on the lower surface of the pressing block 803, the arc groove on the lower surface of the pressing block 803 cooperates with the straightening guide sleeve 802, and the pressing block 803 is threadedly connected with the straightening frame 801.

[0077] The polishing device further includes a waste liquid filtering and recovery box 9, and the waste liquid filtering and recovery box 9 includes:

[0078] A box 901 disposed at the lower part of the bracket 1;

[0079] A partition 902 is disposed in the box body 901, and a hole is opened in the middle of the partition 902. The box body 901 is divided into a filter chamber 904 and a recovery chamber 905 by the partition 902. The other end of the discharge pipe 4 is connected to the filter chamber 904, and the feed pipe 2 is connected to the recovery chamber 905 through the water pump 10;

[0080] A first filter screen 903 disposed on the middle opening of the partition plate 902;

[0081] and a second filter screen 906 and a third filter screen 907 which are sequentially arranged above the filter cavity 904 from top to bottom, wherein the second filter screen 906 and the third filter screen 907 are both located above the first filter screen 903;

[0082] The mesh number of the first filter 903 is 80-2000 mesh, and it is mainly used for filtering the polishing liquid after the liquid level rises. The mesh numbers of the three filters are designed and used in a stepped manner to ensure the recycling of the polishing liquid.

[0083] The mesh number of the second filter 906 is 4-60, and it mainly filters out foreign particles, larger foreign objects, etc.

[0084] The mesh number of the third filter screen 907 is 20-160 meshes, and it mainly filters out magnetic materials and other small particles.

[0085] The second filter screen 906 and the third filter screen 907 are both arranged to be tilted downward from the side in contact with the partition plate 902 to the side opposite to the partition plate 902 .

[0086] During use, the polishing liquid discharged through the discharge pipe 4 is filtered through the second filter screen 906 and the third filter screen 907, and larger particle impurities and magnetic abrasives are filtered out in turn. After filtering, it is precipitated at the bottom of the filter chamber 904, and the tiny particles in the liquid are precipitated at the bottom. The upper liquid enters the recovery chamber 905 through the first filter screen 903.

[0087] The polishing transmission unit 5 comprises:

[0088] Two sets of transmission structures are symmetrically arranged on the bracket 1, and the tube 3 to be ground is frictionally driven by the transmission structures; the two sets of transmission structures are connected and synchronously driven by a second conveyor belt 503;

[0089] And a transmission motor 501 is arranged on the bracket 1, and the transmission motor 501 is connected to any one of the two transmission structures through a first conveyor belt 502.

[0090] Each group of the transmission structure comprises:

[0091] A transmission frame 504 disposed on the bracket 1;

[0092] The transmission shaft 505 at both ends is arranged on the transmission frame 504 through bearings, the transmission shafts 505 of the two transmission structures are connected through the second transmission belt 503, and the transmission shaft 505 of any one transmission structure is connected to the output shaft of the transmission motor 501 through the first transmission belt;

[0093] A transmission wheel 506 coaxially fixedly connected to the transmission shaft 505, wherein a groove is provided in the middle of the transmission wheel 506, wherein the tube to be ground 3 is located in the groove, and the depth of the groove is less than the outer diameter of the tube to be ground 3; the groove may be a V-shaped groove or an arc-shaped groove;

[0094] And a roller 507 is arranged parallel to the axis of the driving wheel 506 , and the pipe 3 to be ground is located between the driving wheel 506 and the roller 507 .

[0095] The magnetic polishing unit 6 comprises:

[0096] The polishing frame 601, the cam top block 703 of the axis fine-tuning vibration unit 7 is located at the lower end surface of the polishing frame 601, and the polishing frame 601 and the slide table 704 of the axis fine-tuning vibration unit 7 are slidably matched;

[0097] A polishing motor 602 disposed on the polishing frame 601;

[0098] And a rotating magnetic pole 603 coaxially arranged with the polishing motor 602, the rotating magnetic pole 603 includes a magnetic pole frame 604 arranged on the polishing frame 601, a rotating shaft 605 rotatably matched with the magnetic pole frame 604, a magnetic base 606 with a through hole in the middle at one end of the rotating shaft 605, and a plurality of magnetic strips 607 located in the magnetic base 606; the output shaft of the polishing motor 602 and the other end of the rotating shaft 605 are connected by a third conveyor belt 608; the circumference of the plurality of magnetic strips 607 is enlarged or reduced by an aperture adjustment device to adapt to pipes 3 to be polished with different diameters; the aperture adjustment device and the magnetic base 606 as a whole adopt the structural form of a four-jaw chuck, and the magnetic strips 607 are located on the claws of the four-jaw chuck.

[0099] The ends of the feed pipe 2 and the discharge pipe 4 are both provided with an inverted cone-shaped sealing rubber plug 11, and the inverted cone-shaped sealing rubber plug 11 includes:

[0100] A fixed tube 1101 connected to the feed tube 2 or the discharge tube 4 at one end, the outer surface of the other end of the fixed tube 1101 is an inverted cone structure 1102, and the side close to the other end is a large size end;

[0101] And an adjustment seat 1103 sleeved on the fixed tube 1101, the adjustment seat 1103 includes an adjustment ring 1104 and an adjustment cylinder 1105 coaxially fixedly connected to the adjustment ring 1104, the adjustment cylinder 1105 is located close to the side of the inverted cone structure 1102, and the sum of the outer diameter of the large-size end of the inverted cone structure 1102 and the wall thickness of the adjustment cylinder 1105 is greater than the inner wall of the tube 3 to be ground.

[0102] When in use, one end of the fixed tube 1101 is fixed on the feed tube 2 or the discharge tube 4, and the other end of the fixed tube 1101 is inserted into the tube to be ground 3, and the adjusting seat 1103 is slid along the fixed tube 1101 toward the tube to be ground 3 and pushed into the gap between the fixed tube 1101 and the tube to be ground 3. Since the other end of the fixed tube 1101 is an inverted cone structure 1102, the pushing and squeezing action of the adjusting seat 1103 realizes a sealed and fixed connection. The larger the adjusting seat 1103 is pushed in, the more secure the sealing and fixing is.

[0103] The polishing method based on the inner wall polishing device of the slender stainless steel pipe comprises the following steps:

[0104] Step 1: Install the pipe to be ground 3 on the polishing device;

[0105] Step 2: Send the polishing liquid and magnetic abrasive to the rotating magnetic pole 603 of the magnetic polishing unit 6, connect one end of the tube to be polished 3 to the feed pipe 2, and the other end to the discharge pipe 4, the other end of the feed pipe 2 is connected to the water pump 10, and connected to the recovery chamber 905 of the waste liquid filter recovery box 9;

[0106] Step 3: Adjust the rotating magnetic pole 603 so that the distance between the inner surface of the circle where the multiple magnetic strips 607 are located and the outer surface of the tube 3 to be ground is 2-50 mm;

[0107] Step 4: Turn on the polishing motor 602 to rotate the rotating magnetic pole 603, and adjust the speed of the polishing motor 602 to 50-10000 r / min;

[0108] Step 5: Turn on the transmission motor 501, and the roller 507 and the transmission wheel 506 roll and rotate to move the pipe 3 to be ground in the axial direction, so as to achieve straightening of the pipe 3 to be ground and polishing of the inner wall of the entire pipe;

[0109] Step 6: Disassemble the pipe to be ground 3 and complete the polishing.

Claims

1. Slender stainless steel pipe inner wall polishing device, including: Bracket (1); It is characterized by further comprising: A feed pipe (2), one end of which is connected to one end of the tube to be ground (3); a discharge pipe (4), one end of which is connected to the other end of the tube to be ground (3); the tube to be ground (3) is filled with magnetic abrasive, polishing liquid is injected into the tube to be ground (3) through the feed pipe (2), and discharged through the discharge pipe (4); A polishing transmission unit (5) disposed on the support (1) and driving the tube to be polished (3) to reciprocate along the length direction; and a magnetic polishing unit (6) for driving the magnetic abrasive in the tube to be polished (3); The polishing device further comprises an axis fine-tuning vibration unit (7), wherein the axis fine-tuning vibration unit (7) comprises: A slide table (704) is arranged on the bracket (1), the slide table (704) and the tube to be polished (3) are arranged in parallel, and the slide table (704) and the lower end of the magnetic polishing unit (6) are slidably matched; A fine-tuning motor (701) is arranged on the bracket (1); A cam (702) connected to the output shaft of the fine-tuning motor (701); and two cam top blocks (703) arranged in parallel, the two cam top blocks (703) being fixed to the lower end of the magnetic polishing unit (6), and the cam (702) being located between the two cam top blocks (703); The polishing device further comprises a straightening unit (8), wherein the straightening unit (8) comprises two groups arranged symmetrically, each group comprising: A straightening frame (801) arranged on the bracket (1), wherein an arc-shaped groove is arranged on the upper surface of the straightening frame (801); A straightening guide sleeve (802) is arranged in the arc groove on the straightening frame (801), the straightening guide sleeve (802) and the arc groove axis of the straightening frame (801) are parallel, and the straightening guide sleeve (802) cooperates with the pipe to be ground (3); and a pressing block (803), wherein the lower surface of the pressing block (803) is provided with an arc groove, the arc groove on the lower surface of the pressing block (803) cooperates with the straightening guide sleeve (802), and the pressing block (803) and the straightening frame (801) are threadedly connected.

2. The device for polishing the inner wall of an elongated stainless steel tube according to claim 1, characterized in that: The polishing device further comprises a waste liquid filtering and recovery box (9), wherein the waste liquid filtering and recovery box (9) comprises: A box body (901) arranged at the bottom of the bracket (1); a partition (902) disposed in the box body (901), the partition (902) having a hole in the middle, the box body (901) being divided into a filtering chamber (904) and a recovery chamber (905) by the partition (902), the other end of the discharge pipe (4) being connected to the filtering chamber (904), and the feed pipe (2) being connected to the recovery chamber (905) via a water pump (10); A first filter screen (903) disposed on the middle opening of the partition (902); and a second filter screen (906) and a third filter screen (907) which are arranged in sequence from top to bottom above the filter cavity (904), wherein the second filter screen (906) and the third filter screen (907) are both located above the first filter screen (903); The mesh number of the first filter (903) is 80-2000 mesh; The mesh number of the second filter (906) is 4-60 meshes; The mesh number of the third filter (907) is between 20 and 160.

3. The device for polishing the inner wall of an elongated stainless steel tube according to claim 2, characterized in that: The second filter screen (906) and the third filter screen (907) are both arranged to tilt downward from the side in contact with the partition plate (902) to the side opposite to the partition plate (902).

4. The device for polishing the inner wall of an elongated stainless steel tube according to claim 2, characterized in that: The polishing transmission unit (5) comprises: Two sets of transmission structures are symmetrically arranged on the support (1), and the tube to be ground (3) is frictionally driven by the transmission structures; the two sets of transmission structures are connected and synchronously driven by a second conveyor belt (503); And a transmission motor (501) arranged on the bracket (1), wherein the transmission motor (501) is connected to any one of the two transmission structures via a first conveyor belt (502).

5. The device for polishing the inner wall of an elongated stainless steel tube according to claim 4, characterized in that: Each group of the transmission structure comprises: A transmission frame (504) disposed on the support (1); A transmission shaft (505) is arranged on the transmission frame (504) at both ends via bearings, the transmission shafts (505) of the two transmission structures are connected via a second transmission belt (503), and the transmission shaft (505) of any one transmission structure and the output shaft of the transmission motor (501) are connected via a first transmission belt; a transmission wheel (506) coaxially fixedly connected to the transmission shaft (505), the transmission wheel (506) having a groove in the middle, the tube to be ground (3) being located in the groove, and the depth of the groove being smaller than the outer diameter of the tube to be ground (3); and a roller (507) arranged parallel to the axis of the driving wheel (506), wherein the pipe to be ground (3) is located between the driving wheel (506) and the roller (507).

6. The device for polishing the inner wall of an elongated stainless steel tube according to claim 5, characterized in that: The magnetic polishing unit (6) comprises: A polishing frame (601), a cam top block (703) of an axis fine-tuning vibration unit (7) is located on the lower end surface of the polishing frame (601), and the polishing frame (601) and the slide table (704) of the axis fine-tuning vibration unit (7) are slidably matched; A polishing motor (602) disposed on the polishing frame (601); and a rotating magnetic pole (603) coaxially arranged with the polishing motor (602), the rotating magnetic pole (603) comprising a magnetic pole frame (604) arranged on the polishing frame (601), a rotating shaft (605) rotatably matched with the magnetic pole frame (604), a magnetic seat (606) with a through hole in the middle at one end of the rotating shaft (605), and a plurality of magnetic strips (607) located in the magnetic seat (606); the output shaft of the polishing motor (602) and the other end of the rotating shaft (605) are connected via a third conveyor belt (608); and the circumference of the plurality of magnetic strips (607) is enlarged or reduced by adjusting the aperture adjustment device.

7. The device for polishing the inner wall of an elongated stainless steel tube according to any one of claims 1 to 3, characterized in that: The end of the feed pipe (2) and the end of the discharge pipe (4) are both provided with an inverted cone-shaped sealing rubber plug (11), and the inverted cone-shaped sealing rubber plug (11) comprises: A fixed tube (1101) connected at one end to a feed tube (2) or a discharge tube (4), wherein the outer surface of the other end of the fixed tube (1101) is an inverted cone structure (1102), and the side close to the other end is a large-sized end; and an adjustment seat (1103) sleeved on the fixed tube (1101), the adjustment seat (1103) comprising an adjustment ring (1104) and an adjustment cylinder (1105) coaxially fixedly connected to the adjustment ring (1104), the adjustment cylinder (1105) being located on a side close to the inverted cone structure (1102), the sum of the outer diameter of the large-size end of the inverted cone structure (1102) and the wall thickness of the adjustment cylinder (1105) being greater than the inner wall of the tube to be ground (3).

8. The polishing method of the inner wall polishing device of the elongated stainless steel tube according to claim 6, characterized in that: The following steps are involved: Step 1: installing the pipe to be ground (3) on a polishing device; Step 2: Send the polishing liquid and magnetic abrasive to the rotating magnetic pole (603) of the magnetic polishing unit (6), connect one end of the tube to be polished (3) to the feed pipe (2), and the other end to the discharge pipe (4), and connect the other end of the feed pipe (2) to the water pump (10) and connect it to the recovery chamber (905) of the waste liquid filter recovery box (9); Step 3: Adjust the rotating magnetic pole (603) so that the distance between the inner surface of the circle where the plurality of magnetic strips (607) are located and the outer surface of the tube to be ground (3) is 2-50 mm; Step 4: Turn on the polishing motor (602) to rotate the rotating magnetic pole (603), and adjust the speed of the polishing motor (602) to 50-10000 r / min; Step 5: Turn on the transmission motor (501), and the roller (507) and the transmission wheel (506) roll and rotate to move the pipe (3) to be ground in the axial direction, so as to achieve straightening of the pipe (3) to be ground and polishing of the inner wall of the entire pipe; Step 6: Disassemble the pipe to be ground (3) and complete the polishing.

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