Fine polishing device for inner wall of nickel-titanium alloy thick pipe

Abstract

The invention discloses a nickel-titanium alloy thick pipe inner wall fine polishing device which is provided with a cylindrical fixed lining capable of being tightly connected to the outer side of a nickel-titanium alloy thick pipe to be polished in a sleeving mode, a sleeve with the bottom closed and a shaft cloth wheel rotating assembly capable of rotating around the axis of the sleeve. The shaft cloth wheel rotating assembly is arranged in the sleeve, the axis of the shaft cloth wheel rotating assembly coincides with the axis of the sleeve, and the maximum rotating diameter of the shaft cloth wheel rotating assembly is equal to the inner diameter of the nickel-titanium alloy thick pipe to be polished. According to the fine polishing device for the inner wall of the thick nickel-titanium alloy pipe, the defects such as scratches, microcracks and pits on the inner wall of the thick nickel-titanium alloy pipe can be effectively removed, the machining efficiency is high, and the smoothness of the surface of a product can be remarkably improved. And meanwhile, through accurate automatic control, the consistency and stability of the polishing process are ensured, and damage to the pipe in the polishing process is effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of metal material processing, in particular to a device for finely polishing the inner wall of a thick nickel-titanium alloy tube. Background Art

[0002] Nickel-titanium alloy, with its excellent superelasticity, shape memory effect, biocompatibility and other properties, has become an indispensable material in many cutting-edge technology fields such as medical devices, aerospace, artificial intelligence, etc. Nickel-titanium alloy thick tube is a commonly used tube in the above fields. The inner diameter of nickel-titanium alloy thick tube is 9mm to 100mm, and the wall thickness is greater than or equal to 0.1mm. Due to its unique functional characteristics, it puts forward extremely high requirements for the processing and manufacturing of the tube.

[0003] In the processing of thick nickel-titanium alloy tubes, despite precise forming and cutting steps, processing marks such as scratches, microcracks and pits will still remain on the inner wall. These defects can increase the flow resistance of the fluid in the tube during use, accelerate the wear of the tube, and even in some sensitive application scenarios, such as biomedical implants, it may have adverse effects on surrounding tissues, thereby threatening the performance and safety of the product.

[0004] Traditional methods of polishing the inner wall of thick nickel-titanium alloy tubes, such as manual grinding and sandblasting, can improve the smoothness of the inner surface of the tube to a certain extent, but their limitations are obvious. Manual grinding is not only inefficient, but also difficult to ensure the uniformity and consistency of the polishing effect; and although sandblasting can improve polishing efficiency, excessive sandblasting can easily damage the surface of the tube, introduce new defects, and affect the overall performance of the tube. In addition, both methods make it difficult to achieve precise control of the polishing depth, limiting the use of such tubes in fields such as biomedicine, aerospace, and artificial intelligence. Summary of the invention

[0005] Based on this, it is necessary to provide a device for fine polishing the inner wall of a nickel-titanium alloy thick tube in response to the above-mentioned technical problems, which can automatically remove defects such as scratches, microcracks and pits on the inner wall of the nickel-titanium alloy thick tube, improve the smoothness, and has high efficiency and is not easy to damage the tube.

[0006] The present invention provides an inner wall fine polishing device for a nickel-titanium alloy thick tube, which is provided with a cylindrical fixed liner that can be tightly sleeved on the outer side of the nickel-titanium alloy thick tube to be polished, a sleeve with a closed bottom, and an axial cloth wheel rotating assembly that can rotate around the axis of the sleeve, the sleeve is sleeved on the outer side of the fixed liner, the axial cloth wheel rotating assembly is arranged inside the sleeve, the axis of the axial cloth wheel rotating assembly coincides with the axis of the sleeve, and the maximum rotation diameter of the axial cloth wheel rotating assembly is equal to the inner diameter of the nickel-titanium alloy thick tube to be polished.

[0007] In one embodiment, the height of the fixed liner is equal to the length of the nickel-titanium alloy thick tube to be polished, the fixed liner includes an upper liner and a lower liner, the upper liner is fixedly connected to the top of the lower liner, and the ratio of the height of the upper liner to the height of the lower liner is 1:16-19;

[0008] A plurality of first through holes are evenly arranged in the middle of the side wall of the lower inner liner along the axial direction, each of the first through holes vertically penetrates the side wall of the lower inner liner, a plurality of groups of second through holes are arranged in the radial direction on the side wall of the lower inner liner, the number of the groups being equal to the number of the first through holes, each group of the second through holes includes a plurality of second through holes evenly distributed in the vertical direction, each second through hole radially penetrates the side wall of the lower inner liner, and each first through hole is connected to all the second through holes in a group of the second through holes;

[0009] A groove ring is arranged in the middle of the lower part of the upper inner liner, and each first through hole is communicated with the groove ring;

[0010] The side wall of the upper liner is provided with a first air extraction hole, and the first air extraction hole is communicated with the groove ring;

[0011] The sleeve is axially provided with a second air extraction hole, which is connected with the first air extraction hole;

[0012] An air pump is arranged outside the sleeve, and the air pump is communicated with the second air pumping hole.

[0013] In one embodiment, the inner wall fine polishing device of the thick nickel-titanium alloy tube is further provided with a lifting mechanism, and the lifting mechanism is provided with an upper base plate, a plurality of supporting columns, a lower base plate, a guide rail, an upper lifting block and a lower lifting block;

[0014] The upper base plate and the lower base plate are parallel and aligned vertically and fixedly connected to the upper and lower ends of a plurality of supporting columns, and the guide rail is vertically fixed in the middle of the upper base plate and the lower base plate;

[0015] The upper lifting block and the lower lifting block are both sleeved on the guide rail and can slide up and down along the guide rail;

[0016] A circular groove is arranged on the top of the lower base plate, and two installation keys are arranged horizontally inside the circular groove.

[0017] In one embodiment, the shaft cloth wheel rotating assembly is provided with an upper spiral shaft, a lower spiral shaft, a top blocking piece, a bottom blocking piece and a cloth wheel sleeved on the lower spiral shaft;

[0018] The upper spiral shaft is coaxial with the lower spiral shaft, and the top of the lower spiral shaft is threadedly connected with the bottom of the upper spiral shaft;

[0019] The top plugging piece and the bottom plugging piece are fixedly connected to the two ends of the lower spiral shaft respectively, the top plugging piece and the bottom plugging piece are perpendicular to the axis of the lower spiral shaft, and the distance between the top plugging piece and the bottom plugging piece is equal to the length of the nickel-titanium alloy thick tube to be polished;

[0020] The top blocking piece and the bottom blocking piece are both circular and have the same radius. The top blocking piece is composed of two semicircular plates, which can be detachably assembled on the lower spiral shaft.

[0021] The top end of the lower spiral shaft penetrates the top sealing piece and then extends out, and the bottom end of the lower spiral shaft penetrates the bottom sealing piece and then extends out;

[0022] The shaft radius of the cloth wheel is equal to the radius of the top sealing piece;

[0023] The top of the cloth wheel abuts against the bottom of the top blocking piece, and the bottom abuts against the top of the bottom blocking piece.

[0024] In one embodiment, the inner wall fine polishing device of the nickel-titanium alloy thick tube is further provided with a rotating motor component and a grinding auxiliary component, the rotating motor component is arranged above the grinding auxiliary component, the rotating motor component is fixedly connected to the upper lifting block, the grinding auxiliary component is fixedly connected to the lower lifting block, the rotation axis of the rotating motor component coincides with the axis of the shaft cloth wheel rotating assembly, and the upper spiral shaft of the shaft cloth wheel rotating assembly is fixedly connected to the rotating motor component;

[0025] The grinding auxiliary component is cylindrical, with an inner diameter equal to the inner diameter of the liner and an outer diameter equal to the outer diameter of the sleeve;

[0026] A circular protrusion is arranged at the bottom of the rotating motor component, a columnar assembly cavity having a radius equal to that of the circular protrusion is arranged at the top of the grinding auxiliary component, and the circular protrusion is assembled in the assembly cavity;

[0027] The bottom of the grinding auxiliary component abuts against the top of the sleeve;

[0028] A rotating hole is provided at the inner center of the bottom of the sleeve, and the bottom end of the lower spiral shaft of the shaft cloth wheel rotating assembly is inserted into the rotating hole;

[0029] The axial radius of the circular groove is equal to the axial radius of the sleeve. Two installation grooves which can be matched with two installation keys respectively are arranged on the outer side of the bottom of the sleeve. The sleeve is inserted into the circular groove.

[0030] In one embodiment, a support ring is disposed inside the sleeve, the outer wall of the support ring is fixedly connected to the inner wall of the sleeve, the inner diameter of the support ring is equal to the inner diameter of the thick nickel-titanium alloy tube to be polished, and the distance from the bottom of the support ring to the inner side of the bottom of the sleeve is greater than the height of the fixed liner;

[0031] The top of the fixed liner abuts against the bottom of the grinding auxiliary member, and the bottom abuts against the top of the support ring.

[0032] The beneficial effects of the present invention are as follows: the shaft cloth wheel rotating assembly of the present invention is fitted with the inner wall of the nickel-titanium alloy thick tube to be polished, the cloth wheel is a flexible assembly, and the clearance shaft cloth wheel rotating assembly rotates to achieve fine polishing of the inner wall of the tube, which can completely remove the inner wall scratches, microcracks and pits of the nickel-titanium alloy thick tube, improve the finish, and the equipment can realize automatic operation and improve production efficiency. In addition, the nickel-titanium alloy thick tube can be tightly attached to and fixed to the inner lining, which can avoid damage such as extrusion to the outer wall of the tube during the polishing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the inner wall fine polishing device of the nickel-titanium alloy thick tube provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of a cross-sectional structure of the inner wall fine polishing device of the nickel-titanium alloy thick tube provided in an embodiment of the present invention along the axis of the first sleeve;

[0035] Figure 3 It is a schematic diagram of the structure of a fixed liner provided in an embodiment of the present invention;

[0036] Figure 4 This is one of the schematic cross-sectional structure diagrams of the fixed liner provided in an embodiment of the present invention along the plane where the axis is located;

[0037] Figure 5 It is a structural schematic diagram of a lifting mechanism provided in an embodiment of the present invention;

[0038] Figure 6 It is a schematic structural diagram of the shaft cloth wheel rotating assembly provided in an embodiment of the present invention;

[0039] Figure 7 This is one of the structural schematic diagrams of the sleeve provided in an embodiment of the present invention;

[0040] Figure 8 This is a schematic diagram of the structure of the sleeve provided in an embodiment of the present invention from another angle.

[0041] Explanation of the reference numerals: 200, fixed lining; 210, sleeve; 211, support ring; 212, rotating hole; 213, mounting groove; rotating hole 220, shaft cloth wheel rotating assembly; 230, rotating motor component; 240, grinding auxiliary component; 300, lifting mechanism; 310, upper base plate; 320, supporting column; 330, lower base plate; 340, guide rail; 350, upper lifting block; 360, lower lifting block; 370, circular groove; 380, mounting key; 400, upper lining; 410, lower lining; 420, first through hole; 430, second through hole; 440, groove ring; 450, first exhaust hole; 460, second exhaust hole; 500, upper spiral shaft; 510, lower spiral shaft; 520, top sealing piece; 530, bottom sealing piece; 540, cloth wheel. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0043] It should be noted that in the description of the present invention, “upper”, “lower”, “top”, “bottom”, orientation or position relationship is based on the attached Figure 1 Regarding the orientation or positional relationship shown, it should be understood that these orientation terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] In one embodiment, Figure 1 and Figure 2 As shown, the inner wall fine polishing device of the nickel-titanium alloy thick tube of this embodiment is provided with a cylindrical fixed liner 200 which can be tightly sleeved on the outer side of the nickel-titanium alloy thick tube to be polished, a sleeve 210 with a closed bottom and an axial cloth wheel rotating assembly 220 which can rotate around the axis of the sleeve 210, the sleeve 210 is sleeved on the outer side of the fixed liner 200, the axial cloth wheel rotating assembly 220 is arranged inside the sleeve 210, the axis of the axial cloth wheel rotating assembly 220 coincides with the axis of the sleeve 210, and the maximum rotation diameter of the axial cloth wheel rotating assembly 220 is equal to the inner diameter of the nickel-titanium alloy thick tube to be polished.

[0045] The shaft cloth wheel rotating assembly 220 can rotate in the fixed liner 200, and polish the inner wall of the nickel-titanium alloy thick tube in combination with the polishing liquid. The polishing particles contained in the polishing liquid have a smaller particle size. The shaft cloth wheel rotating assembly 220 plus the polishing liquid can further polish the inner wall of the nickel-titanium alloy thick tube, remove scratches, and improve the surface smoothness of the inner wall.

[0046] In addition, the fixed liner 200 can be tightly sleeved on the outside of the thick nickel-titanium alloy tube to be polished, thereby avoiding damage to the outer wall of the tube during the polishing process.

[0047] In one embodiment, Figure 3 and Figure 4 As shown, the height of the fixed liner 200 is equal to the length of the nickel-titanium alloy thick tube to be polished, and the fixed liner 200 includes an upper liner 400 and a lower liner 410. The upper liner 400 is fixedly connected to the top of the lower liner 410, and the height ratio of the upper liner 400 to the lower liner 410 is 1:16-19.

[0048] In this embodiment, the height ratio of the upper liner 400 to the lower liner 410 is specifically 1: 19. The first liner 100 and the fixed liner 200 are both made of acid-resistant polymer materials.

[0049] A plurality of first through holes 420 are evenly arranged along the axial direction in the middle portion of the side wall of the lower lining 410, and each first through hole 420 vertically penetrates the side wall of the lower lining 410. A plurality of groups of second through holes 430 equal in number to the first through holes 420 are arranged along the radial direction on the side wall of the lower lining 410, and each group of second through holes 430 includes a plurality of second through holes 430 evenly distributed along the vertical direction, and each second through hole 430 radially penetrates the side wall of the lower lining 410, and each first through hole 420 is connected to all the second through holes 430 in a group of second through holes 430.

[0050] Specifically, the diameters of the first through hole 420 and the second through hole 430 are both 0.5-5 mm.

[0051] A groove ring 440 is provided in the middle of the bottom of the upper liner 400, and each first through hole 420 is connected to the groove ring 440; a first air extraction hole 450 is provided on the side wall of the upper liner 400, and the first air extraction hole 450 is connected to the groove ring 440. A second air extraction hole 460 is axially provided on the sleeve 210, and the second air extraction hole 460 is connected to the first air extraction hole 450; an air extraction pump is provided on the outer side of the sleeve 210, and the air extraction pump is connected to the second air extraction hole 460.

[0052] In the present embodiment, the first through hole 420, the second through hole 430, the groove ring 440, the first air pumping hole 450, the second air pumping hole 460 and the air pump are all connected to form an air pumping passage. When the air pump is turned on, the nickel-titanium alloy thick tube can be tightly fitted to the inner wall surface of the first lining 100 or the fixed lining 200, thereby avoiding damage to the outer wall of the tube during the polishing process.

[0053] In one embodiment, if Figure 5 As shown, the inner wall fine polishing device of the nickel-titanium alloy thick tube is also provided with a lifting mechanism 300, and the lifting mechanism 300 is provided with an upper base plate 310, a plurality of supporting columns 320, a lower base plate 330, a guide rail 340, an upper lifting block 350 and a lower lifting block 360.

[0054] The upper base plate 310 and the lower base plate 330 are parallel and aligned with each other and fixedly connected to the upper and lower ends of the plurality of support columns 320, and the guide rail 340 is vertically fixed between the upper base plate 310 and the lower base plate 330. The upper lifting block 350 and the lower lifting block 360 are both sleeved on the guide rail 340 and can slide up and down along the guide rail 340. A circular groove 370 is provided on the top of the lower base plate 330, and two installation keys 380 are horizontally provided inside the circular groove 370. The depth of the circular groove 370 is half the thickness of the lower base plate 330.

[0055] Specifically, the upper base plate 310 and the lower base plate 330 of the lifting mechanism 300 of this embodiment are both rectangular metal plates, which are arranged horizontally; the lifting mechanism 300 has four supporting columns 320, which are respectively connected at the four corners of the upper base plate 310 and the lower base plate 330, and the four supporting columns 320 are perpendicular to the upper base plate 310 and the lower base plate 330. The guide rail 340 is two sliding columns, each of which is arranged between the two supporting columns 320, and the sliding column is perpendicular to the upper base plate 310 and the lower base plate 330. The upper lifting block 350 and the lower lifting block 360 both include a fixed ring and fixed ears located on both sides of the fixed ring and slidably connected to the two sliding columns. The upper lifting block 350 and the lower lifting block 360 can slide up and down along the guide rail 340.

[0056] In this embodiment, the lower lifting block 360 and the upper lifting block 350 can be moved up and down at a certain speed by motor control, and the specific motor type and structure are not limited.

[0057] In one embodiment, Figure 6 As shown, the shaft cloth wheel rotating assembly 220 is provided with an upper spiral shaft 500, a lower spiral shaft 510, a top blocking piece 520, a bottom blocking piece 530 and a cloth wheel 540 sleeved on the lower spiral shaft 510. The upper spiral shaft 500 is coaxial with the lower spiral shaft 510, and the top of the lower spiral shaft 510 is threadedly connected to the bottom of the upper spiral shaft 500.

[0058] The top blocking piece 520 and the bottom blocking piece 530 are fixedly connected to the two ends of the lower spiral shaft 510 respectively, and the top blocking piece 520 and the bottom blocking piece 530 are perpendicular to the axis of the lower spiral shaft 510, and the distance between the top blocking piece 520 and the bottom blocking piece 530 is equal to the length of the nickel-titanium alloy thick tube to be polished;

[0059] The top blocking piece 520 and the bottom blocking piece 530 are both circular and have the same radius, so the top blocking piece 520 and the bottom blocking piece 530 can block the space between the first liner 100 or the fixed liner 200 during polishing to prevent the grinding medium or polishing liquid from spilling out. The top blocking piece 520 is composed of two semicircular plates, and the two semicircular plates can be detachably assembled on the lower spiral shaft 510. The top blocking piece 520 is composed of two semicircular plates, which facilitates the disassembly and assembly of the top blocking piece 520.

[0060] In this embodiment, the shaft cloth wheel rotating assembly 220 is also provided with fasteners for fixing the two semicircular plates, and the semicircular plates are fastened after the two semicircular plates are assembled to the lower spiral shaft 510.

[0061] The top end of the lower spiral shaft 510 extends out after penetrating the top blocking piece 520, and the bottom end of the lower spiral shaft 510 extends out after penetrating the bottom blocking piece 530. The top end extending part of the lower spiral shaft 510 is connected to the upper spiral shaft 500, and the bottom end extending part is connected to the lifting mechanism 300.

[0062] The shaft radius of the cloth wheel 540 is equal to the radius of the top blocking piece 520; the top of the cloth wheel 540 abuts against the bottom of the top blocking piece 520, and the bottom abuts against the top of the bottom blocking piece 530. A fastening bolt sleeved on the lower spiral shaft 510 is also provided on the top blocking piece 520 of the shaft cloth wheel rotating assembly 220.

[0063] The cloth wheel 540 is a cored sponge / cloth grinding wheel, the core of which is a through-hole metal structure. The cloth wheel 540 can absorb polishing liquid.

[0064] In one embodiment, the shaft cloth wheel rotating assembly 220 is further provided with a rotating motor component 230 and a grinding auxiliary component 240, the rotating motor component 230 is arranged above the grinding auxiliary component 240, the rotating motor component 230 is fixedly connected to the upper lifting block 350, the grinding auxiliary component 240 is fixedly connected to the lower lifting block 360, the rotation axis of the rotating motor component coincides with the axis of the shaft cloth wheel rotating assembly 220, and the upper spiral shaft 500 of the shaft cloth wheel rotating assembly 220 is fixedly connected to the rotating motor component 230. The cloth wheel 540 can be controlled to rotate by the rotating motor component 230.

[0065] The grinding auxiliary component 240 is cylindrical, with an inner diameter equal to that of the inner liner and an outer diameter equal to that of the sleeve 210; a circular protrusion is provided at the bottom of the rotating motor component 230, and a columnar assembly cavity with a radius equal to that of the circular protrusion is provided at the top of the grinding auxiliary component 240, and the circular protrusion is assembled in the assembly cavity. The grinding auxiliary component 240 and the rotating motor component 230 are sealed and assembled through the circular protrusion and the assembly cavity to prevent the polishing liquid from spilling.

[0066] like Figure 7 and Figure 8As shown, the bottom of the grinding auxiliary component 240 abuts against the top of the sleeve 210; a rotating hole is provided at the inner center of the bottom of the sleeve 210, and the bottom end of the lower spiral shaft 510 of the shaft cloth wheel rotating assembly 220 is inserted into the rotating hole; the axial radius of the circular groove 370 is equal to the axial radius of the sleeve 210, and two mounting grooves 112 which can be matched with two mounting keys 380 are provided on the outer side of the bottom of the sleeve 210, and the sleeve 210 is inserted into the circular groove 370; a support ring 211 is provided inside the sleeve 210, and the outer wall of the support ring 211 is fixedly connected to the inner wall of the sleeve 210, and the inner diameter of the support ring 211 is equal to the inner diameter of the nickel-titanium alloy thick tube to be polished, and the distance from the bottom of the support ring 211 to the inner side of the bottom of the sleeve 210 is greater than the height of the fixed liner 200; the top of the fixed liner 200 abuts against the bottom of the grinding auxiliary component 240, and the bottom abuts against the top of the support ring 211.

[0067] Specifically, the space below the support ring 211 inside the sleeve 210 is used to store the polishing liquid.

[0068] In a specific embodiment, the use method of the inner wall fine polishing device of the nickel-titanium alloy thick tube of the present invention is described by taking a nickel-titanium alloy thick tube to be polished with an inner diameter of 20 mm, an outer diameter of 21 mm, and a tube length of 1000 mm as an example. When used, the nickel-titanium alloy thick tube is first cleaned and dried. The specific use method includes the following steps:

[0069] (1) Move the upper lifting block 350 and the lower lifting block 360 to lift the rotating motor component 230 and the grinding auxiliary component 240 upward until the bottom of the cloth wheel 540 is flush with the bottom of the grinding auxiliary component 240 and the distance between the grinding auxiliary component 240 and the sleeve 210 is greater than 1000 mm;

[0070] (2) Fill the sleeve 210 with a polishing liquid of volume V, V = π × (R1 2 -R2 2 )×(H1+H2), wherein R1 is the outer radius of the lower liner 410, R2 is the inner hole radius of the lower liner 410, H1 is the height of the lower liner 410, and H2 is the height of the upper liner 400.

[0071] (3) placing the nickel-titanium alloy thick tube to be polished into the fixed liner 200, and starting the vacuum pump to ensure that the nickel-titanium alloy thick tube to be polished is adsorbed onto the inner wall of the fixed liner 200;

[0072] (4) Move the upper lifting block 350 and the lower lifting block 360 until the bottom end of the lower spiral shaft 510 of the shaft cloth wheel rotating assembly 220 is inserted into the rotating hole, and the bottom of the grinding auxiliary component contacts the top of the sleeve 210. At this time, the cloth wheel 540 is completely immersed in the polishing liquid;

[0073] (5) Start the rotating motor component 130, control the speed of the spiral blade 540 to 15 rpm, and continue to rotate for 3 minutes to allow the cloth wheel 540 to completely absorb the polishing liquid;

[0074] (6) Move the upper lifting block 350 until the bottom end of the cloth wheel 540 is flush with the bottom end of the fixed liner 200;

[0075] (7) Adjust the rotation speed of the rotating motor component 130 to 150 rpm and continue rotating for 5 minutes; adjust the rotation speed of the rotating motor component 130 to 15 rpm, move the upper lifting block 350, and after the lower end of the cloth wheel 540 is flush with the lower end of the grinding auxiliary component 240 (the upper lifting block is not closed here), move the lower lifting block 360 until the distance between the cloth wheel 540 and the grinding auxiliary component 240 is greater than 1000 mm away from the sleeve 210.

[0076] The above method can effectively remove scratches on the inner wall of the nickel-titanium alloy thick tube, improve the smoothness of the inner wall, and realize automatic polishing with high efficiency.

[0077] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A device for finely polishing the inner wall of a thick nickel-titanium alloy tube, characterized in that: A cylindrical fixed liner (200) which can be tightly sleeved on the outside of a thick nickel-titanium alloy tube to be polished, a sleeve (210) with a closed bottom, and an axial cloth wheel rotating assembly (220) which can rotate around the axis of the sleeve (210) are provided; The sleeve (210) is sleeved on the outside of the fixed liner (200), the shaft-closing wheel rotating assembly (220) is arranged inside the sleeve (210), the axis of the shaft-closing wheel rotating assembly (220) coincides with the axis of the sleeve (210), and the maximum rotation diameter of the shaft-closing wheel rotating assembly (220) is equal to the inner diameter of the nickel-titanium alloy thick tube to be polished.

2. The inner wall fine polishing device of the nickel-titanium alloy thick tube according to claim 1 is characterized in that: The height of the fixed liner (200) is equal to the length of the nickel-titanium alloy thick tube to be polished, the fixed liner (200) comprises an upper liner (400) and a lower liner (410), the upper liner (400) is fixedly connected to the top of the lower liner (410), and the height ratio of the upper liner (400) to the lower liner (410) is 1:16-19; A plurality of first through holes (420) are evenly arranged in the middle of the side wall of the lower liner (410) along the axial direction, each first through hole (420) vertically penetrates the side wall of the lower liner (410), and a plurality of groups of second through holes (430) are arranged in the radial direction on the side wall of the lower liner (410), the number of which is equal to the number of the first through holes (420), each group of second through holes (430) includes a plurality of second through holes (430) evenly distributed in the vertical direction, each second through hole (430) radially penetrates the side wall of the lower liner (410), and each first through hole (420) is connected to all the second through holes (430) in a group of second through holes (430); A groove ring (440) is provided in the middle of the bottom of the upper liner (400), and each first through hole (420) is connected to the groove ring (440); The side wall of the upper liner (400) is provided with a first air extraction hole (450), and the first air extraction hole (450) is communicated with the groove ring (440); The sleeve (210) is axially provided with a second air extraction hole (460), and the second air extraction hole (460) is communicated with the first air extraction hole (450); An air pump is disposed outside the sleeve (210), and the air pump is connected to the second air pumping hole (460).

3. The inner wall fine polishing device of the nickel-titanium alloy thick tube according to claim 2 is characterized in that: The inner wall fine polishing device of the thick nickel-titanium alloy tube is also provided with a lifting mechanism (300), and the lifting mechanism (300) is provided with an upper base plate (310), a plurality of supporting columns (320), a lower base plate (330), a guide rail (340), an upper lifting block (350) and a lower lifting block (360); The upper base plate (310) and the lower base plate (330) are parallel and aligned vertically and fixedly connected to the upper and lower ends of the plurality of support columns (320), and the guide rail (340) is vertically fixed between the upper base plate (310) and the lower base plate (330); The upper lifting block (350) and the lower lifting block (360) are both sleeved on the guide rail (340) and can slide up and down along the guide rail (340); A circular groove (370) is arranged at the top of the lower base plate (330), and two installation keys (380) are arranged horizontally inside the circular groove (370).

4. The inner wall fine polishing device of the nickel-titanium alloy thick tube according to claim 3 is characterized in that: The shaft cloth wheel rotating assembly (220) is provided with an upper spiral shaft (500), a lower spiral shaft (510), a top blocking piece (520), a bottom blocking piece (530), and a cloth wheel (540) sleeved on the lower spiral shaft (510); The upper spiral shaft (500) and the lower spiral shaft (510) are coaxial, and the top of the lower spiral shaft (510) is threadedly connected to the bottom of the upper spiral shaft (500); The top blocking piece (520) and the bottom blocking piece (530) are respectively fixedly connected to the two ends of the lower spiral shaft (510), and the top blocking piece (520) and the bottom blocking piece (530) are both perpendicular to the axis of the lower spiral shaft (510), and the distance between the top blocking piece (520) and the bottom blocking piece (530) is equal to the length of the nickel-titanium alloy thick tube to be polished; The top blocking piece (520) and the bottom blocking piece (530) are both circular and have the same radius. The top blocking piece (520) is composed of two semicircular plates, and the two semicircular plates are detachably assembled on the lower spiral shaft (510); The top end of the lower spiral shaft (510) penetrates the top sealing piece (520) and then extends out, and the bottom end of the lower spiral shaft (510) penetrates the bottom sealing piece (530) and then extends out; The axial radius of the cloth wheel (540) is equal to the radius of the top sealing piece (520); The top of the cloth wheel (540) abuts against the bottom of the top sealing piece (520), and the bottom abuts against the top of the bottom sealing piece (530).

5. The inner wall fine polishing device of the nickel-titanium alloy thick tube according to claim 4 is characterized in that: The inner wall fine polishing device of the thick nickel-titanium alloy tube is also provided with a rotating motor component (230) and a grinding auxiliary component (240); the rotating motor component (230) is arranged above the grinding auxiliary component (240); the rotating motor component (230) is fixedly connected to an upper lifting block (350); the grinding auxiliary component (240) is fixedly connected to a lower lifting block (360); the rotation axis of the rotating motor component coincides with the axis of the shaft cloth wheel rotating assembly (220); and the upper spiral shaft (500) of the shaft cloth wheel rotating assembly (220) is fixedly connected to the rotating motor component (230); The grinding auxiliary component (240) is cylindrical, with an inner diameter equal to the inner diameter of the liner and an outer diameter equal to the outer diameter of the sleeve (210); The bottom of the rotating motor component (230) is provided with a circular protrusion, the top of the grinding auxiliary component (240) is provided with a columnar assembly cavity with a radius equal to the radius of the circular protrusion, and the circular protrusion is assembled in the assembly cavity; The bottom of the grinding auxiliary component (240) abuts against the top of the sleeve (210); A rotation hole is provided at the inner center of the bottom of the sleeve (210), and the bottom end of the lower spiral shaft (510) of the shaft cloth wheel rotating assembly (220) is inserted into the rotation hole; The axial radius of the circular groove (370) is equal to the axial radius of the sleeve (210), and two installation grooves (112) that can be matched with two installation keys (380) are arranged on the outer side of the bottom of the sleeve (210), and the sleeve (210) is inserted into the circular groove (370).

6. The inner wall fine polishing device of the nickel-titanium alloy thick tube according to claim 5, characterized in that: A support ring (211) is arranged inside the sleeve (210), the outer wall of the support ring (211) is fixedly connected to the inner wall of the sleeve (210), the inner diameter of the support ring (211) is equal to the inner diameter of the nickel-titanium alloy thick tube to be polished, and the distance from the bottom of the support ring (211) to the inner side of the bottom of the sleeve (210) is greater than the height of the fixed liner (200); The top of the fixed liner (200) abuts against the bottom of the grinding auxiliary component (240), and the bottom abuts against the top of the support ring (211).

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