Adjustable stainless steel pipe inner and outer wall synchronous precision grinding device

Abstract

This invention relates to the field of steel pipe processing technology, and discloses an adjustable precision grinding device for the synchronous inner and outer walls of stainless steel pipes. The device includes a worktable, an outer circular polishing assembly, an inner circular polishing drive assembly, and a connecting pipe. Multiple grinding units are arranged in a ring at equal intervals on the outer side of the connecting pipe. A support and adjustment mechanism is installed inside the connecting pipe, connected to the grinding units. A transmission mechanism connects the grinding units and the drive shaft of the inner circular polishing drive assembly. The support and adjustment assembly drives each grinding unit to move radially synchronously and maintain stable contact with the inner wall of the pipe. This prevents the feed shaft from increasing the grinding pressure on the inner wall of the pipe due to the gravity of the cantilevered portion. Simultaneously, the grinding units can adsorb dust and particles during rotation, preventing vibration caused by contact between the grinding units and particles, further improving the grinding accuracy of the pipe's interior.

Description

Technical Field

[0001] This invention relates to the field of steel pipe processing technology, and in particular to an adjustable precision grinding device for the inner and outer walls of stainless steel pipes. Background Technology

[0002] Simultaneous grinding of the inner and outer walls of stainless steel pipes is a process that comprehensively treats the surface of the pipe. Its core is to use mechanical means to remove defects such as oxide scale, welding slag, and burrs from the inner and outer walls of the pipe, thereby optimizing the surface condition of the inner and outer walls, improving the corrosion resistance of the pipe wall, and meeting cleanliness requirements.

[0003] The integrated inner and outer circular polishing machine is widely used in the field of simultaneous grinding of the inner and outer walls of stainless steel pipes. By placing the stainless steel pipe to be processed on the drive roller, the drive roller drives the pipe to rotate. The polishing wheels of the outer and inner circular polishing components rotate and come into contact with the surface of the pipe. The polishing components move at a constant speed along the axial direction of the pipe, so as to achieve simultaneous grinding and polishing of the inner and outer walls of the pipe, thereby improving processing efficiency and the consistency of surface treatment.

[0004] However, the equipment has the following problems in actual operation: As the feed shaft of the inner polishing component drives the polishing wheel to gradually extend into the pipe, the cantilever length of the feed shaft gradually increases, which reduces the rigidity of the cantilever portion of the feed shaft. When dealing with long pipes, the cantilever portion of the feed shaft will undergo slight bending deformation under the combined action of its own weight and the weight of the polishing wheel it bears. This deformation will cause an uneven increase in the contact pressure between the polishing wheel and the inner wall of the pipe, ultimately resulting in inconsistent polishing precision of the inner wall of long pipes, affecting the quality stability of the inner wall surface treatment. At the same time, granular waste such as welding slag and burrs generated during the grinding process inside the pipe cannot be discharged in time. When the polishing wheel comes into contact with the particles during high-speed rotation, radial runout will occur, causing wavy defects of varying depths on the inner wall of the pipe, and even directly scratching the pipe wall, thereby further aggravating the deviation in the grinding precision of the pipe and reducing the grinding quality of the inner wall of the stainless steel pipe. Summary of the Invention

[0005] In view of the problems of increased pressure between the polishing wheel and the tube wall and easy radial runout of the polishing wheel caused by excessively long feed axis cantilever in the existing technology, an adjustable precision grinding device for the inner and outer walls of stainless steel tubes is proposed.

[0006] The purpose is to replace the transmission polishing wheel with multiple grinding units. Under the extension of the support and adjustment mechanism, the grinding units are driven to make stable contact with the inner wall of the pipe, maintaining stable grinding pressure. At the same time, the grinding units generate suction when rotating, adsorbing particles and preventing the grinding units from jumping.

[0007] The technical solution of the present invention is an adjustable stainless steel tube inner and outer wall synchronous precision grinding processing device, including a worktable, an outer circle polishing component, an inner circle polishing drive component, and a connecting pipe. The connecting pipe is fixedly connected to one end of the feed shaft of the inner circle polishing drive component. Multiple grinding units are arranged in a ring at equal intervals on the outer side of the connecting pipe. A support adjustment mechanism is provided inside the connecting pipe. The support adjustment mechanism is connected to the grinding unit. A transmission mechanism is connected between the grinding unit and the drive shaft of the inner circle polishing drive component.

[0008] The support adjustment mechanism includes two worm gears disposed in the connecting tube. Multiple worm wheels are meshed with the outer side of the worm gears. Folding arms are fixedly connected to the worm wheels. A connecting seat is connected between two axially arranged folding arms. The grinding unit is connected to the connecting seat.

[0009] The polishing unit includes a fixed cylinder rotatably connected to the connecting seat. Multiple arc-shaped polishing plates are fixedly connected in an annular pattern at equal intervals on the outer wall of the fixed cylinder. Multiple through holes are opened on the tube wall of the fixed cylinder. A bidirectional guide impeller is fixedly connected inside the open end of the fixed cylinder, and a filter cylinder is installed inside the fixed cylinder.

[0010] Furthermore, the support adjustment mechanism also includes a connecting rod, which is rotatably connected inside the connecting tube. The worm gear is fixedly sleeved on the outer wall of the connecting rod. A handwheel is provided on the lower side of the connecting tube. The handwheel shaft movably passes through the connecting tube and is connected to a steering gear at one end of the connecting rod.

[0011] Furthermore, the two axially arranged folding arms are symmetrically configured, with one end of the folding arm hinged to the connecting pipe and the other end of the folding arm hinged to the connecting seat.

[0012] Furthermore, the bidirectional wind guide impeller includes a connecting ring, and multiple blades are fixedly connected to the inner and outer walls of the connecting ring at equal intervals in a ring shape. The blades on the outer wall of the connecting ring are connected to the inner wall of the fixed cylinder, and the blades on the inner and outer walls of the connecting ring are arranged in opposite directions.

[0013] Furthermore, the inner wall of the fixed cylinder is axially and equally spaced with multiple guide rings, the cross-section of the guide rings is triangular, and the outer wall of the guide rings is provided with guide grooves facing the through holes.

[0014] Furthermore, a fixing ring is fixedly connected inside the open end of the filter cylinder, one end of the fixing ring passes through the fixing ring and is fixedly connected to a guide plate, the guide plate has an annular groove on the side facing the filter cylinder, the guide plate is rotatably connected to the fixing cylinder, and the other end of the filter cylinder is rotatably connected to a bidirectional guide impeller.

[0015] Two air guide plates are fixedly connected to the outer wall of the filter cartridge. The air guide plates are bent on one side facing the bidirectional air guide impeller. The other end of the air guide plate is connected and fixed to a fixing ring. The air guide plate has a clearance groove that matches the guide ring. The fixing ring has a notch between the two air guide plates. A counterweight rod is fixedly connected to the bottom of the outer wall of the filter cartridge.

[0016] Furthermore, the transmission mechanism includes a splined shaft, one end of which is fixedly connected to the drive shaft of the inner circle polishing drive assembly. A bushing is movably sleeved on the outer wall of the splined shaft. A transmission gear is fixedly connected to one end of the outer wall of the bushing, and a positioning plate is rotatably connected to the other end of the outer wall of the bushing. The positioning plate is slidably connected to the feed shaft of the inner circle polishing drive assembly. Multiple driven gears are rotatably connected to the positioning plate. The driven gears mesh with the transmission gear. The transmission mechanism also includes multiple connecting shafts. Universal joints are connected to both ends of each connecting shaft. One universal joint is connected to a fixed cylinder, and the other universal joint is connected to a corresponding driven gear.

[0017] Furthermore, an elastic element is sleeved on the outer wall of the spline shaft, and the two ends of the elastic element are respectively connected and fixed to the end of the spline shaft and the side wall of the transmission gear.

[0018] Furthermore, both ends of the connecting seat are rotatably connected to guide wheels, and both ends of the connecting seat are slidably connected to sliders. The sliders are rotatably connected to the fixed cylinder, and the sliders and the connecting seat are connected together by an elastic element two.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The support and adjustment components drive each grinding unit to move radially and synchronously, and make stable contact with the inner wall of the pipe. This avoids the feed shaft from increasing the grinding pressure of the grinding unit on the inner wall of the pipe due to the gravity of the cantilever part, thereby improving the grinding accuracy of the inner wall of the pipe and ensuring the consistency of the pipe surface treatment. At the same time, the grinding unit can adsorb dust and particles when rotating, avoiding the grinding unit from jumping due to contact with particles, and further improving the grinding accuracy of the grinding unit on the inside of the pipe.

[0021] 2. The guide ring can guide the airflow to form a directional flow between the fixed cylinder and the filter cylinder, enhancing the inward suction at the through hole. At the same time, the air guide plate and the guide ring work together to make the through hole of the fixed cylinder facing the side closest to the inner wall of the pipe form a stronger suction, thereby increasing the adsorption effect on the particles attached to the inner wall of the pipe.

[0022] 3. The grinding unit is slidably connected to the connecting seat via a slider, so that the arc-shaped grinding plate forms elastic contact with the inner wall of the pipe. This can effectively buffer the vibration and instantaneous impact during the grinding process, avoid the fluctuation of grinding accuracy caused by rigid contact, reduce the hard wear between the grinding unit and the inner wall of the pipe, reduce the probability of failure, and extend the service life of the equipment. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the connecting pipe and grinding unit structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the support adjustment mechanism of the present invention;

[0026] Figure 4 This is a schematic diagram of the fixed cylinder and arc-shaped grinding plate structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the internal structure of the fixed cylinder of the present invention;

[0028] Figure 6 This is a schematic cross-sectional view of the fixed cylinder and guide ring structure of the present invention;

[0029] Figure 7 This is a disassembled schematic diagram of the filter cartridge structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the filter cartridge and air guide plate structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the transmission mechanism structure of the present invention;

[0032] Figure 10 This is a schematic diagram of the connecting seat and slider structure of the present invention.

[0033] In the picture:

[0034] 1. Outer circle polishing assembly; 2. Inner circle polishing drive assembly; 3. Connecting pipe; 4. Grinding unit; 41. Fixed cylinder; 42. Arc-shaped grinding plate; 43. Through hole; 44. Bidirectional guide impeller; 45. Filter cartridge; 46. Fixed ring; 47. Guide plate; 5. Support adjustment mechanism; 51. Worm gear; 52. Worm wheel; 53. Folding arm; 54. Connecting seat; 55. Connecting rod; 6. Transmission mechanism; 61. Splined shaft; 62. Bushing; 63. Transmission gear; 64. Positioning plate; 65. Driven gear; 66. Coupling; 67. Universal joint; 7. Guide ring; 8. Guide groove; 9. Air guide plate; 10. Counterweight rod; 11. Guide wheel; 12. Slider. Detailed Implementation

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] Example 1

[0037] Reference Figures 1-5 This invention provides a first embodiment of an adjustable precision grinding device for the inner and outer walls of stainless steel tubes, comprising a worktable, an outer circular polishing assembly 1, an inner circular polishing drive assembly 2, and a connecting pipe 3. The connecting pipe 3 is fixedly connected to one end of the feed shaft of the inner circular polishing drive assembly 2. Multiple grinding units 4 are arranged in a ring at equal intervals on the outer side of the connecting pipe 3. A support adjustment mechanism 5 is provided inside the connecting pipe 3, and the support adjustment mechanism 5 is connected to the grinding units 4. A transmission mechanism 6 is connected between the grinding units 4 and the drive shaft of the inner circular polishing drive assembly 2. The support adjustment mechanism 5 includes two components arranged in a ring at equal intervals on the outer side of the connecting pipe 3. The worm 51 inside the connecting pipe 3 has multiple worm wheels 52 meshing with its outer side. Folding arms 53 are fixedly connected to the worm wheels 52. A connecting seat 54 is connected between two axially arranged folding arms 53. The grinding unit 4 is connected to the connecting seat 54. The grinding unit 4 includes a fixed cylinder 41 rotatably connected to the connecting seat 54. Multiple arc-shaped grinding plates 42 are fixedly connected in an annular pattern at equal intervals on the outer wall of the fixed cylinder 41. Multiple through holes 43 are opened on the wall of the fixed cylinder 41. A bidirectional guide impeller 44 is fixedly connected inside the open end of the fixed cylinder 41. A filter cylinder 45 is installed inside the fixed cylinder 41.

[0038] Specifically, when the two worm gears 51 rotate synchronously, they drive the meshing worm wheel 52 to rotate accordingly. The two axially arranged folding arms 53 cooperate with each other under the drive of the worm wheel 52, thereby driving the connecting seat 54 to move radially away from the connecting pipe 3, so that the grinding unit 4 gradually contacts the inner wall of the pipe. At this time, the drive shaft of the inner circle polishing drive assembly 2 drives the grinding unit 4 to rotate through the transmission mechanism 6, and the arc-shaped grinding plate 42 begins to perform grinding and polishing operations on the inner wall of the pipe. At the same time, the rotation of the bidirectional guide impeller 44 causes a directional and rapid airflow in the fixed cylinder 41. When this airflow passes through the through hole 43, it drives the air outside the fixed cylinder 41 to flow into it, thereby adsorbing the dust and particles generated during the grinding process into the filter cylinder 45.

[0039] By precisely limiting the position of the grinding unit 4 through the support and adjustment mechanism 5, the arc-shaped grinding plate 42 can always maintain stable pressure in contact with the inner wall of the pipe. This effectively avoids the problem of increased pressure on the inner wall of the pipe caused by excessive feed shaft cantilever, and improves the grinding accuracy of the inner wall of the pipe, ensuring the consistency of the pipe surface treatment. At the same time, the suction force generated by the rotation of the fixed cylinder 41 can promptly adsorb surrounding dust and particles, preventing the grinding unit 4 from jumping due to contact with particles during rotation.

[0040] Reference Figure 3 The support adjustment mechanism 5 also includes a connecting rod 55, which is rotatably connected inside the connecting tube 3. The worm gear 51 is fixedly sleeved on the outer wall of the connecting rod 55. A handwheel is provided on the lower side of the connecting tube 3. The handwheel shaft is movably inserted into the connecting tube 3 and is connected to a steering gear at one end of the connecting rod 55.

[0041] Specifically, when the handwheel is turned, power is transmitted to the connecting rod 55 via the steering gear, driving the connecting rod 55 to rotate, which in turn drives the two opposing worm gears 51 to rotate synchronously. The worm gears 51 mesh with the worm wheel 52, causing the folding arm 53 to extend, thereby moving the connecting seat 54 away from the connecting tube 3, ultimately achieving contact between the grinding unit 4 and the inner wall of the tube. With the help of the support adjustment mechanism 5, the grinding unit 4 can be precisely controlled to maintain stable contact with the inner wall of the tube at all times.

[0042] The unidirectional transmission between the worm 51 and the worm wheel 52 ensures that the connecting seat 54 remains stable when stopped at any position, preventing displacement and loosening.

[0043] Reference Figure 3 Two folding arms 53 arranged axially are symmetrically arranged. One end of the folding arm 53 is hinged to the connecting pipe 3, and the other end of the folding arm 53 is hinged to the connecting seat 54.

[0044] Specifically, when the two axially arranged worm gears 52 rotate in opposite directions, they will generate a corresponding driving force on the folding arm 53 connected to them. Under the action of this driving force, the two support rods of the folding arm 53 will rotate around the hinge point, causing the entire folding arm 53 to unfold and extend, thereby driving the connecting seat 54 to move smoothly in the radial direction, ensuring that the grinding unit 4 can accurately contact the inner wall of the pipe and maintain stable pressure.

[0045] Reference Figure 5 , Figure 7 The bidirectional guide impeller 44 includes a connecting ring. Multiple blades are fixedly connected to the inner and outer walls of the connecting ring at equal intervals. The blades on the outer wall of the connecting ring are connected to the inner wall of the fixed cylinder 41. The blades on the inner and outer walls of the connecting ring are arranged in opposite directions.

[0046] Specifically, the connecting ring of the bidirectional guide impeller 44 is sized to match the filter cartridge 45. When the fixed cylinder 41 drives the bidirectional guide impeller 44 to rotate, the blades on the outer wall of the connecting ring push outside air through the port of the fixed cylinder 41 into its interior. Due to the blocking effect of the filter cartridge 45, this air flows between the outer walls of the fixed cylinder 41 and the filter cartridge 45, eventually entering the interior of the filter cartridge 45 through its port. Simultaneously, the blades on the inner wall of the connecting ring push the air inside the filter cartridge 45 towards the outside, forming a directional air circulation. During this airflow process, dust and particles generated during grinding are intercepted inside the filter cartridge 45, preventing particle accumulation within the tube.

[0047] The bidirectional airflow impeller 44 efficiently collects dust and particles generated during grinding, preventing them from accumulating inside the pipe and affecting the normal operation of the grinding unit 4. Through directional airflow, it ensures that particles are stably intercepted in the filter cartridge 45, reducing radial runout caused by particles contacting the grinding unit 4, and further ensuring grinding accuracy.

[0048] Example 2

[0049] Reference Figure 5 , Figure 6 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: multiple guide rings 7 are fixedly connected axially at equal intervals on the inner wall of the fixed cylinder 41. The guide rings 7 have a triangular cross-section and a guide groove 8 is provided on the outer wall of the guide rings 7 facing the through hole 43.

[0050] Specifically, the presence of the guide ring 7 effectively prevents air entering the fixed cylinder 41 from escaping outward through the through hole 43, thereby guiding the air to form a stable directional flow between the fixed cylinder 41 and the filter cylinder 45. During the directional air flow, the air in the guide groove 8 moves into the fixed cylinder 41, and this movement creates a continuous inward suction force at the through hole 43. With this suction force, dust and particles on the outside of the fixed cylinder 41 can be successfully adsorbed into the fixed cylinder 41 and then intercepted by the filter cylinder 45.

[0051] Reference Figure 7 , Figure 8A fixing ring 46 is fixedly connected inside the open end of the filter cylinder 45. One end of the fixing ring 46 extends out of the fixing ring 46 and is fixedly connected to a guide plate 47. The guide plate 47 has an annular groove on the side facing the filter cylinder 45. The guide plate 47 is rotatably connected to the fixing cylinder 41. The other end of the filter cylinder 45 is rotatably connected to the bidirectional air guide impeller 44. Two air guide plates 9 are fixedly connected to the outer wall of the filter cylinder 45. The side of the air guide plate 9 facing the bidirectional air guide impeller 44 has a bent structure. The other end of the air guide plate 9 is fixedly connected to the fixing ring 46. The air guide plate 9 has a clearance groove that matches the guide ring 7. The fixing ring 46 has a notch between the two air guide plates 9. A counterweight rod 10 is fixedly connected to the bottom of the outer wall of the filter cylinder 45.

[0052] Specifically, dust and particles between the fixed cylinder 41 and the filter cylinder 45 move with the air. Guided by the annular groove of the guide plate 47, these dust and particles can enter the filter cylinder 45 more smoothly. The counterweight rod 10 keeps the filter cylinder 45 stationary, ensuring stable filtration. The two air guide plates 9 are Y-shaped, with their larger openings facing the bidirectional air guide impeller 44. This design accelerates airflow when entering between the two air guide plates 9, thereby enhancing the suction of the corresponding through-hole 43. The fixed ring 46 is connected to the two air guide plates 9, and the cross-sectional area of ​​the fixed ring 46 is larger than the annular area between the fixed ring 46 and the filter cylinder 45. This allows most of the suction in the filter cylinder 45 to act between the two air guide plates 9 through the fixed ring 46, further increasing the suction of the corresponding through-hole 43, allowing the through-hole 43 to adsorb particles more efficiently.

[0053] Understandably, the particles generated by grinding are relatively light and will rotate synchronously with the inner wall of the pipe. Under the action of the counterweight rod 10, the gap between the two air guide plates 9 is always facing the nearest inner wall of the pipe, thereby reducing the loss of suction. When the corresponding through hole 43 is close to the inner wall of the pipe, the particles can be effectively adsorbed into the fixed cylinder 41.

[0054] By adsorbing the dust and particles generated during grinding, the shaking of the grinding unit 4 during rotation is prevented, ensuring stable contact pressure between the grinding unit 4 and the inner wall of the pipe. This also prevents grinding damage to the inner wall of the pipe when the grinding unit 4 comes into contact with particles, and saves subsequent cleaning work on the inner wall of the pipe. The rest of the structure is the same as that in Embodiment 1.

[0055] Example 3

[0056] Reference Figure 2 , Figure 9This is the third embodiment of the present invention, which differs from the second embodiment in that: the transmission mechanism 6 includes a spline shaft 61, one end of which is fixedly connected to the drive shaft of the inner circle polishing drive assembly 2, a bushing 62 is movably sleeved on the outer wall of the spline shaft 61, a transmission gear 63 is fixedly connected to one end of the outer wall of the bushing 62, and a positioning plate 64 is rotatably connected to the other end of the outer wall of the bushing 62. The positioning plate 64 is slidably connected to the feed shaft of the inner circle polishing drive assembly 2, and a plurality of driven gears 65 are rotatably connected to the positioning plate 64. The driven gears 65 are meshed with the transmission gears 63. The transmission mechanism 6 also includes a plurality of connecting shafts 66, both ends of which are connected to universal joints 67. One universal joint 67 is connected to the fixed cylinder 41, and the other universal joint 67 is connected to the corresponding driven gear 65.

[0057] Specifically, the sliding fit structure between the spline shaft 61 and the bushing 62 provides flexible adaptability for the radial movement of the grinding unit 4. When the grinding unit 4 moves radially, the connecting shaft 66, through the adaptive angle adjustment of the universal joints 67 at both ends, can always maintain a stable rotational connection with the grinding unit 4 and the drive shaft, ensuring the continuous smooth flow of power transmission. When the drive shaft of the inner circle polishing drive assembly 2 starts to rotate, it will drive the spline shaft 61 to rotate synchronously, which in turn drives the transmission gear 63 to rotate through the bushing 62. Since the transmission gear 63 and the driven gear 65 mesh with each other, the rotation of the transmission gear 63 will drive the driven gear 65 to rotate together. The power of the driven gear 65 is then transmitted to the connecting shaft 66 through the universal joint 67, and finally the connecting shaft 66 drives the grinding unit 4 to achieve stable rotation, ensuring the smooth progress of the grinding operation.

[0058] Reference Figure 9 An elastic element is sleeved on the outer wall of the spline shaft 61, and the two ends of the elastic element are respectively connected and fixed to the end of the spline shaft 61 and the side wall of the transmission gear 63.

[0059] Specifically, when the support adjustment mechanism 5 is in a contracted state, the elastic element 1 is in a stretched state. When the support adjustment mechanism 5 is extended, the contraction of the elastic element 1 causes the bushing 62 to move towards the connecting pipe 3 side, so that the transmission mechanism 6 as a whole can make adaptive adjustments more promptly.

[0060] Reference Figure 10 Both ends of the connecting seat 54 are rotatably connected to guide wheels 11, and both ends of the connecting seat 54 are slidably connected to sliders 12. The sliders 12 are rotatably connected to the fixed cylinder 41, and the sliders 12 and the connecting seat 54 are connected together by an elastic element 2.

[0061] Specifically, when the connecting seat 54 moves radially, the guide wheels 11 at both ends of it first contact the inner wall of the pipe, providing initial positioning and support. Simultaneously, since the sliders 12 at both ends of the connecting seat 54 are rotatably connected to the fixed cylinder 41, and an elastic element 2 connects the sliders 12 and the connecting seat 54, the grinding unit 4 can slide within a certain range on the connecting seat 54 via the sliders 12 under the elastic action of the elastic element 2. This sliding characteristic allows the grinding unit 4 to form elastic contact with the inner wall of the pipe, rather than a rigid collision. This elastic contact effectively buffers vibrations or instantaneous impacts that may occur during grinding, avoiding fluctuations in grinding accuracy caused by rigid contact. It also reduces hard wear between the grinding unit 4 and the inner wall of the pipe, lowering the probability of grinding unit failure and extending its service life. The remaining structure is the same as in Embodiment 2.

[0062] Based on embodiments 1-3, the working principle of this invention is as follows: The stainless steel pipe to be polished is placed between the two drive rollers on the worktable. The inner circle polishing drive assembly 2 drives the polishing assembly 4 to move to the inner wall port of the pipe. When the handwheel is turned, the connecting rod 55 drives the worm gear 51 to rotate. The worm gear 51 drives the worm wheel 52 to extend the folding arm 53, which drives the connecting seat 54 to move radially. The guide wheel 11 first contacts and positions itself against the inner wall of the pipe. Then, the polishing unit 4 elastically contacts the inner wall under the action of the elastic element 2. The outer circle polishing assembly 1 starts to move and polish the outer wall of the pipe. The drive shaft of the inner circle polishing drive assembly 2 drives the polishing unit 4 to rotate via the spline shaft 61, bushing 62, transmission gear 63, driven gear 65, connecting shaft 66 and universal joint 67. The arc-shaped polishing plate 42 polishes the inner wall of the pipe. At the same time, the fixed cylinder 41 drives the bidirectional guide impeller 44 to rotate. With the help of the guide ring 7 and the guide plate 9, the through hole 43 generates suction, which adsorbs dust particles into the filter cylinder 45.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An adjustable precision grinding device for the inner and outer walls of stainless steel pipes, comprising a worktable, an outer circular polishing assembly (1), and an inner circular polishing drive assembly (2), characterized in that, It also includes a connecting pipe (3), which is fixedly connected to one end of the feed shaft of the inner circle polishing drive assembly (2). Multiple grinding units (4) are arranged in a ring at equal intervals on the outside of the connecting pipe (3). A support adjustment mechanism (5) is provided inside the connecting pipe (3). The support adjustment mechanism (5) is connected to the grinding unit (4). A transmission mechanism (6) is connected between the grinding unit (4) and the drive shaft of the inner circle polishing drive assembly (2). The support adjustment mechanism (5) includes two worms (51) disposed in the connecting tube (3). Multiple worm wheels (52) are meshed on the outside of the worms (51). Folding arms (53) are fixedly connected to the worm wheels (52). A connecting seat (54) is connected between the two axially arranged folding arms (53). The grinding unit (4) is connected to the connecting seat (54). The polishing unit (4) includes a fixed cylinder (41) rotatably connected to the connecting seat (54). Multiple arc-shaped polishing plates (42) are fixedly connected to the outer wall of the fixed cylinder (41) at equal intervals in a ring. Multiple through holes (43) are opened on the wall of the fixed cylinder (41). A bidirectional guide impeller (44) is fixedly connected inside the open end of the fixed cylinder (41). A filter cylinder (45) is installed inside the fixed cylinder (41). Multiple guide rings (7) are fixedly connected to the inner wall of the fixed cylinder (41) at equal intervals in an axial direction. The guide rings (7) have a triangular cross-section, and guide grooves (8) are opened on the outer wall of the guide rings (7) facing the through holes (43). A fixed ring (46) is fixedly connected inside the open end of the filter cylinder (45). One end of the fixed ring (46) passes through… A fixed ring (46) is fixedly connected to a guide plate (47). The guide plate (47) has an annular groove on the side facing the filter cylinder (45). The guide plate (47) is rotatably connected to the fixed cylinder (41). The other end of the filter cylinder (45) is rotatably connected to a bidirectional air guide impeller (44). Two air guide plates (9) are fixedly connected to the outer wall of the filter cylinder (45). The air guide plate (9) has a bent structure on the side facing the bidirectional air guide impeller (44). The other end of the air guide plate (9) is fixedly connected to the fixed ring (46). A clearance groove adapted to the guide ring (7) is opened on the air guide plate (9). The fixed ring (46) has a notch between the two air guide plates (9). A counterweight rod (10) is fixedly connected to the bottom of the outer wall of the filter cylinder (45).

2. The adjustable stainless steel pipe inner and outer wall synchronous precision grinding device according to claim 1, characterized in that, The support adjustment mechanism (5) also includes a connecting rod (55), which is rotatably connected to the connecting tube (3). The worm gear (51) is fixedly sleeved on the outer wall of the connecting rod (55). A handwheel is provided on the lower side of the connecting tube (3). The handwheel shaft is movably inserted into the connecting tube (3) and connected to a steering gear at one end of the connecting rod (55).

3. The adjustable stainless steel pipe inner and outer wall synchronous precision grinding device according to claim 1, characterized in that, The two folding arms (53) arranged axially are symmetrically arranged. One end of the folding arm (53) is hinged to the connecting pipe (3), and the other end of the folding arm (53) is hinged to the connecting seat (54).

4. The adjustable stainless steel pipe inner and outer wall synchronous precision grinding device according to claim 1, characterized in that, The bidirectional wind guide impeller (44) includes a connecting ring. The inner and outer walls of the connecting ring are fixedly connected with multiple blades at equal intervals in an annular shape. The blades on the outer wall of the connecting ring are connected to the inner wall of the fixed cylinder (41). The blades on the inner and outer walls of the connecting ring are arranged in opposite directions.

5. The adjustable stainless steel pipe inner and outer wall synchronous precision grinding device according to claim 1, characterized in that, The transmission mechanism (6) includes a spline shaft (61), one end of which is fixedly connected to the drive shaft of the inner circle polishing drive assembly (2). A bushing (62) is movably sleeved on the outer wall of the spline shaft (61). A transmission gear (63) is fixedly connected to one end of the outer wall of the bushing (62). A positioning plate (64) is rotatably connected to the other end of the outer wall of the bushing (62). The positioning plate (64) is slidably connected to the feed shaft of the inner circle polishing drive assembly (2). Multiple driven gears (65) are rotatably connected to the positioning plate (64). The driven gears (65) mesh with the transmission gears (63). The transmission mechanism (6) also includes multiple connecting shafts (66). Universal joints (67) are connected to both ends of the connecting shafts (66). One of the universal joints (67) is connected to the fixed cylinder (41), and the other universal joint (67) is connected to the corresponding driven gear (65).

6. The adjustable stainless steel pipe inner and outer wall synchronous precision grinding device according to claim 5, characterized in that, The outer wall of the spline shaft (61) is fitted with an elastic element, and the two ends of the elastic element are respectively connected and fixed to the end of the spline shaft (61) and the side wall of the transmission gear (63).

7. The adjustable stainless steel pipe inner and outer wall synchronous precision grinding device according to claim 1, characterized in that, Both ends of the connecting seat (54) are rotatably connected to guide wheels (11), and both ends of the connecting seat (54) are slidably connected to sliders (12). The sliders (12) are rotatably connected to the fixed cylinder (41), and the sliders (12) and the connecting seat (54) are connected together by an elastic element.

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