Anode rotating seal device of a variable-diameter conical tube inner wall plasma polishing equipment

Abstract

The present application belongs to the technical field of metal material plasma polishing, and particularly relates to an anode rotating sealing device of a variable-diameter conical tube inner wall plasma polishing equipment. The device is composed of a small-end rotating sealing device, a large-end rotating sealing device and a polishing liquid recycling device. In use, the two ends of the variable-diameter conical tube (the machined tubular part is regarded as an anode) are respectively loaded into the small-end rotating sealing device and the large-end rotating sealing device, and a certain section of the variable-diameter conical tube is left with a cylindrical process platform so as to provide driving force for the rotating movement of the variable-diameter conical tube clamped by a numerical control rotary table of a horizontal polishing machining equipment. The small-end rotating sealing device and the large-end rotating sealing device can be fixed relative to a headstock case of the horizontal polishing machining equipment during machining, and the polishing liquid recycling device can be closely arranged at the end face of the large-end rotating sealing device to realize sealing and recycling of the polishing liquid, thereby solving the anode rotating sealing problem of the variable-diameter conical tube, the inner wall polishing process of a deep hole with a special cross section and a large length-diameter ratio.

Description

Technical Field

[0001] This invention belongs to the field of plasma polishing technology for metal materials, and in particular, it relates to an anode rotary sealing device for plasma polishing equipment for the inner wall of a variable-diameter tapered tube. Background Technology

[0002] Currently, high aspect ratio tapered metal tubular parts are mainly used in military and oil extraction fields, such as the rifling of artillery barrels of various calibers and the irregularly shaped helical deep holes of pump stators in oil extraction equipment. These special structures place high demands on the forming precision and surface quality of the inner wall. Due to the unique shape of their inner wall surfaces, traditional mechanical polishing methods are insufficient. While chemical polishing and magnetic abrasive polishing can achieve this, the resulting surface quality is relatively low, and the processes are complex and costly. Therefore, plasma polishing technology is the ideal method for polishing irregularly shaped helical deep holes in high aspect ratio tapered metal tubular parts.

[0003] Plasma polishing technology is a dynamic process involving simultaneous gas discharge and electrochemical reaction. A prerequisite for successful polishing is that the removal rate of the gas discharge must exceed the generation rate of the chemical reaction. Tubular parts are used as the anode, and a shaped electrode, fabricated according to the internal surface structure of the tubular part, serves as the cathode, connected to the positive and negative terminals of a power source, respectively. During processing, the cathode and anode do not directly contact each other, maintaining a certain gap filled with the polishing fluid required for the polishing reaction. To achieve overall polishing of the inner wall surface of the tubular part and obtain good surface quality, the workpiece anode needs to be rotated at a certain speed and possess functions of guiding, sealing, conducting electricity, and insulating. Therefore, to meet the requirements of plasma polishing of the inner wall surface of tubular parts with large length-to-diameter ratios, a reliable and effective anode rotary sealing structure needs to be designed and developed. Summary of the Invention

[0004] The purpose of this invention is to provide an anode rotary sealing device for plasma polishing equipment of variable diameter tapered tubes, which solves the problem of anode rotary sealing in the polishing process of tapered tubes with large length-to-diameter ratios and spiral deep holes with irregular cross-sections.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0006] An anode rotary seal device for plasma polishing of the inner wall of a variable-diameter tapered tube is disclosed. The device consists of three parts arranged sequentially along the same horizontal axis: a small-end rotary seal device, a large-end rotary seal device, and a polishing fluid recovery device. The small-end rotary seal device and the large-end rotary seal device are respectively installed at both ends of the variable-diameter tapered tube, and the polishing fluid recovery device is close to the end face of the large-end rotary seal device. When polishing the inner surface of the variable-diameter tapered tube, the anode rotary seal device is installed on the bed guide rail of the horizontal polishing machine, realizing horizontal movement along the bed guide rail on the guide rail. The tube part being processed realizes rotational movement along the machine tool spindle through the anode rotary seal device.

[0007] The anode rotary sealing device of the plasma polishing equipment for the inner wall of the variable-diameter tapered tube, the small-end rotary sealing device includes: a small-end O-ring, a small-end end cap, bolts and nuts, a small-end deep groove ball bearing, a small-end support, a small-end axial sealing gasket, a small-end insulating sleeve, and a small-end shaft retaining ring. The specific structure is as follows: the larger through holes on both sides of the inner cavity of the small-end support mate with the outer diameter of the small-end deep groove ball bearing to achieve circumferential positioning; one end face of the small-end deep groove ball bearing mates with the inner boss surface of the small-end support to achieve axial unidirectional positioning; the other end face of the small-end deep groove ball bearing contacts the outer boss surface of the small-end end cap, thus performing... Positioning: The small end cap is fastened to both ends of the small end support with bolts and nuts, and shims are added between them to adjust the bearing clearance; the smaller shaft section of the small end insulating sleeve is fitted with the inner diameter of the small end deep groove ball bearing to achieve circumferential positioning; the outer boss surface of the small end insulating sleeve contacts one end face of the small end deep groove ball bearing; a small end shaft retaining ring is installed in the small end shaft retaining ring groove on the other side of the small end deep groove ball bearing, and the two contact to achieve axial positioning; the small end insulating sleeve is installed into the small end support, a small end O-ring is installed in the small end O-ring seal groove, and a small end axial sealing gasket is installed in the small end axial sealing surface of the small end insulating sleeve to achieve sealing.

[0008] The anode rotary sealing device of the plasma polishing equipment for the inner wall of the variable-diameter tapered tube has a stepped cylindrical shape with a larger diameter shaft section in the middle and smaller diameter shaft sections at both ends. The two ends of the larger diameter shaft section of the small-end insulating sleeve are external boss surfaces. The smaller diameter shaft sections on both sides of the external boss surface of the small-end insulating sleeve are provided with small-end shaft end retaining ring grooves. The external boss surface of the small-end insulating sleeve corresponds to the end face of the small-end deep groove ball bearing. The inner cavity of the small-end insulating sleeve is a hollow stepped hole with the inner cavity diameter increasing from left to right. The inner side of the hole with the smaller diameter at the left end is provided with a small-end O-ring sealing ring groove. One end of the tube-like part to be processed is inserted into the larger diameter hole at the right end of the inner cavity of the small-end insulating sleeve, and a small-end axial sealing gasket is installed between the inner boss surface of the small-end insulating sleeve at the right end of the inner cavity of the small-end insulating sleeve and the end face of the tube-like part to be processed. The small-end insulating sleeve is made of plastic.

[0009] The anode rotary sealing device of the plasma polishing equipment for the inner wall of the variable diameter tapered tube has a small end support with a small end flanged cylinder and a small end base combined in an upper and lower structure. The small end flanged cylinder has a stepped hole with a smaller diameter in the middle and a larger diameter at both ends. The end face of the small end deep groove ball bearing corresponds to the inner boss surface of the small end support. Bolt holes are evenly distributed on the flanges at both ends of the small end flanged cylinder. After the small end insulating sleeve is installed into the small end flanged cylinder, small end caps are installed at both ends of the small end flanged cylinder.

[0010] The anode rotary sealing device of the plasma polishing equipment for the inner wall of the variable-diameter tapered tube, the large-end rotary sealing device includes: a large-end end cover, a large-end deep groove ball bearing, a large-end support, a large-end inner axial sealing gasket, a large-end insulating sleeve, a large-end shaft end retaining ring, and a large-end O-ring. The specific structure is as follows: the larger through holes on both sides of the inner cavity of the large-end support mate with the outer diameter of the large-end deep groove ball bearing to achieve circumferential positioning; one end face of the large-end deep groove ball bearing mates with the inner boss surface of the large-end support to achieve axial unidirectional positioning; the other end face of the large-end deep groove ball bearing contacts the outer boss surface of the large-end end cover, thus aligning the large-end deep groove ball bearing... Positioning is performed; the large end cap is fastened to both ends of the large end support by matching bolts and nuts, and shims are added between them to adjust the bearing clearance; the left and middle smaller shaft sections of the large end insulating sleeve are fitted with the inner diameter of the large end deep groove ball bearing to achieve circumferential positioning; the boss surface of the middle section of the large end insulating sleeve contacts one end face of the large end deep groove ball bearing; the other side of the large end deep groove ball bearing screws the large end shaft end retaining ring into the threaded surface of the middle section of the large end insulating sleeve to achieve axial positioning; the large end insulating sleeve is installed into the large end support, and the large end O-ring is installed in the groove of the large end O-ring to achieve circumferential sealing.

[0011] The anode rotary sealing device of the plasma polishing equipment for the inner wall of the variable-diameter tapered tube has a stepped cylindrical shape for the large-end insulating sleeve. The diameter of the shaft sections on both sides of the large-end insulating sleeve with the larger diameter decreases. The right side of the large-end insulating sleeve with the large-end insulating sleeve's ... The second-level end face on the right side of the boss in the middle section of the large-end insulating sleeve is the outer boss face of the large-end insulating sleeve. The third-level outer circular surface on the right side of the boss in the middle section of the large-end insulating sleeve has a groove for the large-end O-ring seal. The inner cavity of the large-end insulating sleeve is a hollow stepped hole, and the inner cavity diameter decreases from left to right. One end of the pipe-like part to be processed is inserted into the larger diameter hole at the left end of the inner cavity of the large-end insulating sleeve. An axial sealing gasket is installed between the inner boss face of the large-end insulating sleeve at the left end of the inner cavity of the large-end insulating sleeve and the end face of the pipe-like part to achieve an axial sealing effect. The large-end insulating sleeve is made of plastic.

[0012] The anode rotary sealing device of the plasma polishing equipment for the inner wall of the variable diameter tapered tube has a large-end support with a large-end flanged cylinder and a large-end base combined in an upper and lower structure. The large-end flanged cylinder has a stepped hole with a smaller diameter in the middle and larger diameters at both ends. The end face of the large-end deep groove ball bearing corresponds to the inner boss surface of the large-end support. Bolt holes are evenly distributed on the flanges at both ends of the large-end flanged cylinder. After the large-end insulating sleeve is installed into the large-end flanged cylinder, large-end end caps are installed at both ends of the large-end flanged cylinder.

[0013] The aforementioned anode rotary sealing device for plasma polishing of the inner wall of a variable-diameter tapered tube, and the polishing fluid recovery device, consist of an axial sealing gasket on the outer side of the large end, a polishing fluid recovery tank, a polishing fluid recovery tank support, and a polishing fluid recovery tank clamping structure. The specific structure is as follows: The inner cavity of the polishing fluid recovery tank, closed at one end, is a stepped hole composed of a smaller diameter portion and two larger diameter portions on either side. A groove for an O-ring seal is provided on the surface of the smaller diameter portion. The axial sealing gasket on the outer side of the large end is installed on the inner boss surface on the left side of the smaller diameter portion of the polishing fluid recovery tank. An O-ring seal is installed in the groove for the O-ring seal on the large end. Axial sealing is achieved through tight contact between the left side of the polishing fluid recovery tank and the right end face of the large end insulating sleeve. The polishing fluid recovery tank is installed within the inner cavity of the polishing fluid recovery tank support. A return pipe is installed at the tail of the polishing fluid recovery tank. Bolt holes corresponding to the polishing fluid recovery tank are provided on the polishing fluid recovery tank support. Bolts are installed in these bolt holes to fix the polishing fluid recovery tank. The polishing fluid recovery tank clamping structure corresponds to the closed end of the polishing fluid recovery tank via a pressure plate.

[0014] The design concept of this invention is:

[0015] This invention designs an anode rotary sealing device for plasma polishing of the inner wall of a variable-diameter tapered tube. The device consists of a small-end rotary sealing device, a large-end rotary sealing device, and a polishing fluid recovery device. The small-end and large-end rotary sealing devices are composed of supports, bearings, insulating sleeves, O-rings, axial sealing gaskets, shaft end retaining rings, and end caps. The polishing fluid recovery device consists of a polishing fluid recovery tank, an O-ring, an axial sealing gasket, and a polishing fluid recovery tank clamping structure. Through the coordinated operation of the small-end rotary sealing device, the large-end rotary sealing device, and the polishing fluid recovery device, axial clamping and polishing fluid recovery can be achieved.

[0016] Compared with existing technologies, the anode rotary sealing device of the plasma polishing equipment for the inner wall of the variable diameter tapered tube of this invention has achieved the following beneficial technical effects:

[0017] 1. The anode rotary sealing device of the present invention can realize the rotation of pipes with large length-to-diameter ratio along the axis, and at the same time can achieve axial and circumferential sealing of the anode of the processed pipe parts. This solves the problem of anode rotary sealing tooling design for the polishing process of inner wall of spiral deep hole with large length-to-diameter ratio tapered pipes and irregular cross-section, and provides a reference case for the subsequent processing of such parts.

[0018] 2. The anode rotary sealing device of the present invention has the characteristics of simple structure, reliable performance and convenient assembly, and is especially suitable for the surface finishing technology of tapered pipes with large length-to-diameter ratio and spiral deep hole parts with irregular cross-section. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the anode rotary sealing device in a plasma polishing equipment for the inner wall of a variable-diameter tapered tube.

[0020] Figure 2 This is a schematic diagram of the main structure of the small end of the anode rotary sealing device.

[0021] Figure 3 This is a schematic diagram of the main structure of the large end of the anode rotary sealing device.

[0022] Figure 4 This is a schematic diagram of the small end cap structure of the anode rotary seal device. In the diagram, (a) is the front view and (b) is the AA cross-sectional view in (a).

[0023] Figure 5 This is a schematic diagram of the small end support structure of the anode rotary seal device. In the diagram, (a) is the front view and (b) is the BB cross-sectional view in (a).

[0024] Figure 6 This is a schematic diagram of the axial sealing gasket structure at the small end of the anode rotary sealing device. In the diagram, (a) is the front view and (b) is the CC cross-sectional view in (a).

[0025] Figure 7 This is a schematic diagram of the small-end insulating sleeve structure of the anode rotary sealing device.

[0026] Figure 8 This is a schematic diagram of the large end cap structure of the anode rotary seal device. In the diagram, (a) is the front view and (b) is the DD cross-sectional view in (a).

[0027] Figure 9 This is a schematic diagram of the large end support structure of the anode rotary seal device. In the diagram, (a) is the front view and (b) is the EE cross-sectional view in (a).

[0028] Figure 10 This is a schematic diagram of the axial sealing gasket structure on the inner side of the large end of the anode rotary sealing device. In the diagram, (a) is the front view and (b) is the FF cross-sectional view in (a).

[0029] Figure 11 This is a schematic diagram of the insulating sleeve structure at the large end of the anode rotary sealing device.

[0030] Figure 12This is a schematic diagram of the retaining ring structure at the large end of the anode rotary seal device. (a) is the main view, and (b) is the GG cross-sectional view in (a).

[0031] Figure 13 This is a schematic diagram of the polishing fluid recovery tank structure of the anode rotary seal device. In the diagram, (a) is the front view and (b) is the HH cross-sectional view in (a).

[0032] Figure 14 This is a schematic diagram of the axial sealing gasket structure on the outer side of the large end of the anode rotary sealing device. In the diagram, (a) is the front view and (b) is the LL cross-sectional view in (a).

[0033] Figure 15 This is a schematic diagram of the pressing structure of the polishing fluid recovery tank for the anode rotary seal device.

[0034] Figure 16 This is a three-dimensional installation diagram of the anode rotary sealing device in a plasma polishing equipment for the inner wall of a variable-diameter tapered tube.

[0035] Numbering on the map:

[0036] 1. Small end O-ring seal; 2. Small end cap (2.1 Small end cap outer boss surface); 3. Bolt and nut; 4. Small end deep groove ball bearing; 5. Small end support (5.1 Small end support inner boss surface, 5.2 Small end flanged cylinder, 5.3 Small end base); 6. Small end axial sealing gasket; 7. Small end insulating sleeve (7.1 Small end shaft end retaining ring groove, 7.2 Small end O-ring seal groove, 7.3 Small end insulating sleeve outer boss surface, 7... 7.4 Inner boss surface of small end insulating sleeve; 7.5 Outer boss surface of small end insulating sleeve); 8. Variable diameter tapered tube; 9. Small end shaft retaining ring; 10. Large end cover (10.1 Outer boss surface of large end cover); 11. Large end deep groove ball bearing; 12. Large end support (12.1 Inner boss surface of large end support; 12.2 Large end flanged cylinder; 12.3 Large end base); 13. Large end inner axial sealing gasket; 14. Large end insulating sleeve (1 4.1 Inner boss surface of the large-end insulating sleeve; 14.2 Middle boss surface of the large-end insulating sleeve; 14.3 Threaded surface of the middle section of the large-end insulating sleeve; 14.4 Outer boss surface of the large-end insulating sleeve; 14.5 Groove of the large-end O-ring seal; 14.6 Boss of the middle section of the large-end insulating sleeve); 15. Large-end shaft end retaining ring; 16. Axial sealing gasket on the outer side of the large end; 17. Large-end O-ring seal; 18. Polishing fluid recovery tank (18.1 Polishing fluid recovery tank) Left side, 18.2 inner boss surface of the left side of the polishing fluid recovery tank, 18.3 groove of the O-ring seal inside the polishing fluid recovery tank, 18.4 return pipe); 19, polishing fluid recovery tank support (19.1 bolt hole); 20, polishing fluid recovery tank clamping structure (20.1 handwheel, 20.2 screw, 20.3 pressure plate); 21, guide rail surface; I, small end rotary sealing device; II, large end rotary sealing device; III, polishing fluid recovery device. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0038] Example 1

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 and Figure 16As shown in the figure, the present invention proposes an anode rotary sealing device for plasma polishing equipment of inner wall of variable diameter tapered tube. The specific embodiments in the figure are used to describe the anode rotary sealing device for plasma polishing equipment of inner wall of variable diameter tapered tube. Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 2 This is a schematic diagram of the small-end rotary sealing device of the present invention. Figure 3 This is a schematic diagram of the large-end rotary sealing device of the present invention. The device consists of three parts arranged sequentially along the same horizontal axis: a small-end rotary sealing device I, a large-end rotary sealing device II, and a polishing fluid recovery device III. In use, the two ends of the variable-diameter tapered tube 8 (the tube being processed) are respectively inserted into the small-end rotary sealing device I and the large-end rotary sealing device II. A section of the variable-diameter tapered tube 8 has a cylindrical process table surface, allowing the CNC rotary table of the horizontal polishing equipment to clamp the variable-diameter tapered tube 8 and provide driving force for its rotation. The small-end rotary sealing device I and the large-end rotary sealing device II can be fixed relative to the headstock of the horizontal polishing equipment during processing. The polishing fluid recovery device III can be placed close to the end face of the large-end rotary sealing device II to achieve sealing and the recovery and reuse of the polishing fluid.

[0040] The small-end rotary sealing device I includes: a small-end O-ring 1, a small-end end cap 2, bolts and nuts 3, a small-end deep groove ball bearing 4, a small-end support 5, a small-end axial sealing gasket 6, a small-end insulating sleeve 7, and a small-end shaft retaining ring 9. The specific structure is as follows: The larger through holes on both sides of the inner cavity of the small-end support 5 mate with the outer diameter of the small-end deep groove ball bearing 4 to achieve circumferential positioning. One end face of the small-end deep groove ball bearing 4 mates with the inner boss surface 5.1 of the small-end support to achieve axial unidirectional positioning. The other end face of the small-end deep groove ball bearing 4 contacts the outer boss surface 2.1 of the small-end end cap, thus ensuring accurate and reliable positioning of the small-end deep groove ball bearing 4. The small-end end cap 2 is fastened to both ends of the small-end support 5 by bolts and nuts 3, and shims can be added between them to adjust the bearing clearance. The smaller shaft section of the small-end insulating sleeve 7 is fitted with the inner diameter of the small-end deep groove ball bearing 4 to achieve circumferential positioning. The outer boss surface 7.3 of the small-end insulating sleeve contacts one end face of the small-end deep groove ball bearing 4. The small-end shaft retaining ring 9 is installed in the small-end shaft retaining ring groove 7.1 on the other side of the small-end deep groove ball bearing 4, and the two contact to achieve axial positioning. The small-end insulating sleeve 7 is installed into the small-end support 5, thereby achieving smooth rotation. The small-end O-ring 1 is installed in the small-end O-ring groove 7.2, and the small-end axial sealing gasket 6 is installed in the inner boss surface 7.4 of the small-end insulating sleeve to achieve a sealing effect.

[0041] like Figure 5As shown, the small end support 5 adopts a combination structure of small end flanged cylinder 5.2 and small end base 5.3. The small end flanged cylinder 5.2 has a stepped hole with a smaller diameter in the middle and a larger diameter at both ends. The end face of the small end deep groove ball bearing 4 corresponds to the inner boss surface 5.1 of the small end support. Six bolt holes are evenly distributed on each of the flanges at both ends of the small end flanged cylinder 5.2. After the small end insulating sleeve 7 is installed into the small end flanged cylinder 5.2, the small end end caps 2 are installed at both ends of the small end flanged cylinder 5.2 to fix the internal parts.

[0042] like Figure 7 As shown, the small-end insulating sleeve 7 has a stepped cylindrical shape with a larger diameter shaft section in the middle and smaller diameter shaft sections at both ends. The two end faces of the larger diameter shaft section of the small-end insulating sleeve are the small-end insulating sleeve outer boss surface 7.3 and the small-end insulating sleeve outer boss surface 7.5. The smaller diameter shaft sections on both sides of the small-end insulating sleeve outer boss surface 7.3 and the small-end insulating sleeve outer boss surface 7.5 are provided with small-end shaft end retaining ring grooves 7.1. The small-end insulating sleeve outer boss surface 7.3 corresponds to the end face of the small-end deep groove ball bearing 4. The inner cavity of the small-end insulating sleeve 7 is a hollow stepped hole, with the inner cavity diameter increasing from left to right. The inner side of the smaller diameter hole at the left end is provided with a small-end O-ring sealing groove 7.2. One end of the pipe part to be processed is inserted into the larger diameter hole at the right end of the inner cavity of the small-end insulating sleeve 7, and a small-end axial sealing gasket 6 is installed between the small-end insulating sleeve inner boss surface 7.4 at the right end of the inner cavity of the small-end insulating sleeve 7 and the end face of the pipe part to ensure axial sealing effect. The small-end insulating sleeve is made of plastic to achieve insulation effect.

[0043] The large-end rotary sealing device II includes: a large-end end cap 10, a large-end deep groove ball bearing 11, a large-end support 12, a large-end inner axial sealing gasket 13, a large-end insulating sleeve 14, a large-end shaft end retaining ring 15, and a large-end O-ring seal 17. The specific structure is as follows: The larger through holes on both sides of the inner cavity of the large-end support 12 mate with the outer diameter of the large-end deep groove ball bearing 11 to achieve circumferential positioning. One end face of the large-end deep groove ball bearing 11 mates with the inner boss surface 12.1 of the large-end support to achieve axial unidirectional positioning. The other end face of the large-end deep groove ball bearing 11 contacts the outer boss surface 10.1 of the large-end end cap, thus ensuring accurate and reliable positioning of the large-end deep groove ball bearing 11. The large-end end cap 10 is fastened to both ends of the large-end support 12 by matching bolts and nuts. Shims can be added between the two ends to adjust the bearing clearance. The left and middle smaller shaft sections of the large-end insulating sleeve 14 are fitted with the inner diameter of the large-end deep groove ball bearing 11 to achieve circumferential positioning. The boss surface 14.2 of the middle section of the large-end insulating sleeve contacts one end face of the large-end deep groove ball bearing 11. The large-end shaft end retaining ring 15 is screwed into the threaded surface 14.3 of the middle section of the large-end insulating sleeve on the other side of the large-end deep groove ball bearing 11, thereby achieving axial positioning. The large-end insulating sleeve 14 is then installed into the large-end support 12, allowing for smooth rotation. A large-end O-ring 17 is installed in the large-end O-ring groove 14.5 to achieve a circumferential sealing effect.

[0044] like Figure 9 As shown, the large end support 12 adopts an upper and lower combined structure of a large end flanged cylinder 12.2 and a large end base 12.3. The large end flanged cylinder 12.2 has a stepped hole with a smaller diameter in the middle and a larger diameter at both ends. The end face of the large end deep groove ball bearing 11 corresponds to the inner boss surface 12.1 of the large end support. The flanges at both ends of the large end flanged cylinder 12.2 are evenly distributed with eight bolt holes. After the large end insulating sleeve 14 is installed into the large end flanged cylinder 12.2, the large end end caps 10 are installed at both ends of the large end flanged cylinder 12.2 to fix the internal parts.

[0045] like Figure 11As shown, the large-end insulating sleeve 14 has a stepped cylindrical shape. The diameter of the shaft sections with larger diameters decreases on both sides of the large-end insulating sleeve middle section boss 14.6. The right side shaft section of the large-end insulating sleeve middle section boss 14.6 has a stepped structure with the diameter gradually decreasing in three stages. The two end faces of the large-end insulating sleeve middle section boss 14.6 are the large-end insulating sleeve middle section boss surfaces 14.2, which correspond to the end faces of the large-end deep groove ball bearing 11. The first-stage outer circular surface on the right side of the large-end insulating sleeve middle section boss 14.6 is the large-end insulating sleeve middle section threaded surface 14.3. The second-stage end face on the right side of the large-end insulating sleeve middle section boss 14.6 is the large-end insulating sleeve outer boss surface 14.4. The third-stage outer circular surface on the right side of the large-end insulating sleeve middle section boss 14.6 has a large-end O-ring sealing ring groove 14.5. The inner cavity of the large-end insulating sleeve 14 is a hollow stepped hole, with the inner cavity diameter decreasing from left to right. One end of the tubular part to be processed is inserted into the larger diameter hole at the left end of the inner cavity of the large-end insulating sleeve 14, and an inner axial sealing gasket 13 is installed between the inner boss surface 14.1 of the large-end insulating sleeve 14 and the end face of the tubular part to ensure axial sealing. The large-end insulating sleeve 14 is made of plastic to provide insulation.

[0046] The polishing fluid recovery device III consists of an outer axial sealing gasket 16 at the large end, a polishing fluid recovery tank 18, a polishing fluid recovery tank support 19, and a polishing fluid recovery tank clamping structure 20. The specific structure is as follows: The inner cavity of the polishing fluid recovery tank 18, which is closed at one end, is a stepped hole consisting of a smaller diameter portion and two larger diameter portions on both sides. The surface of the smaller diameter portion is provided with an O-ring groove 18.3 for the polishing fluid recovery tank. The outer axial sealing gasket 16 at the large end can be installed in the inner boss surface 18.2 on the left side of the smaller diameter portion of the polishing fluid recovery tank. The O-ring 17 at the large end can be installed in the O-ring groove 18.3. Axial sealing is achieved by the close contact between the left side surface 18.1 of the polishing fluid recovery tank and the right end face of the large end insulating sleeve 14. The polishing slurry recovery tank 18 is installed inside the polishing slurry recovery tank support 19. The polishing slurry recovery tank 18 is equipped with a return pipe 18.4 at its tail end to allow the polishing slurry to flow out. The polishing slurry recovery tank support 19 has bolt holes 19.1 corresponding to the polishing slurry recovery tank 18. The polishing slurry recovery tank 18 can be fixed by installing bolts in the bolt holes 19.1. The polishing slurry recovery tank clamping structure 20 corresponds to the closed end of the polishing slurry recovery tank 18 through the pressure plate 20.3.

[0047] like Figure 15 As shown, the polishing liquid recovery tank clamping structure 20 is equipped with a handwheel 20.1, a screw 20.2, and a pressure plate 20.3. The handwheel 20.1 is installed at one end of the horizontal screw 20.2, and the pressure plate 20.3 is installed vertically at the other end of the screw 20.2.

[0048] Example 2

[0049] The installation scheme of this invention is as follows:

[0050] like Figure 1 , Figure 2 As shown, during the installation of the small-end rotary sealing device I, first install the small-end deep groove ball bearing 4 into the left side of the small-end support 5, and then tighten the corresponding small-end end cover 2 and small-end support 5 together with bolts and nuts 3. A small-end O-ring seal 1 is installed inside the small-end insulating sleeve 7. The smaller shaft section of the small-end insulating sleeve 7 matches the inner diameter of the small-end deep groove ball bearing 4 to achieve circumferential positioning. The outer boss surface 7.3 of the small-end insulating sleeve contacts the end face of the small-end deep groove ball bearing 4. A small-end shaft retaining ring 9 is installed in the small-end shaft end retaining ring groove 7.1 of the smaller shaft section of the small-end insulating sleeve 7, and the two contact to achieve axial positioning. Then, install the small-end deep groove ball bearing 4, the small-end shaft retaining ring 9, the small-end end cover 2, and the bolts and nuts 3 sequentially into the right side of the inner cavity of the small-end support 5.

[0051] like Figure 1 , Figure 3 As shown, during the installation of the large-end rotary sealing device II, first install the large-end deep groove ball bearing 11 into the right side of the large-end support 12, and then tighten the corresponding large-end end cap 10 and large-end support 12 together with bolts and nuts 3. The middle smaller shaft section of the large-end insulating sleeve 14 is fitted with the inner diameter of the large-end deep groove ball bearing 11 to achieve circumferential positioning. The boss surface 14.2 of the middle section of the large-end insulating sleeve contacts one end face of the large-end deep groove ball bearing 11. The large-end shaft end retaining ring 15 is screwed into the threaded surface 14.3 of the middle section of the large-end insulating sleeve on the other side of the large-end deep groove ball bearing 11, thereby achieving axial positioning. Then, install the large-end deep groove ball bearing 11, the large-end shaft retaining ring 15, the large-end end cap 10, and the bolts and nuts 3 into the left side of the inner cavity of the large-end support 12 in sequence.

[0052] like Figure 1 , Figure 13 , Figure 14 , Figure 15 As shown, during the installation of the polishing slurry recovery device III, the polishing slurry recovery tank 18 is installed on the polishing slurry recovery tank support 19. The position of the polishing slurry recovery tank 18 is adjusted and fixed by adjusting the bolts on the polishing slurry recovery tank support 19. The axial compression and sealing of the anode rotary sealing device are achieved by the spiral movement of the rightmost polishing slurry recovery tank pressing structure 20.

[0053] Example 3

[0054] like Figure 1 , Figure 2 , Figure 3 and Figure 16As shown, when the device of the present invention performs spiral deep hole polishing with irregular cross-section, the small end rotary sealing device I, the large end rotary sealing device II, and the polishing liquid recovery device III of the anode rotary sealing device are respectively matched with the guide rail surface 21 of the horizontal polishing equipment (such as a horizontal plasma polishing machine). They can slide or be relatively fixed on the guide rail surface 21. The variable diameter tapered tube 8 (the tube part to be processed) is rotated along the machine tool spindle by the CNC rotary table of the equipment and connected to the positive terminal of the power supply through the conductive busbar. The polishing electrode is connected to the negative terminal of the power supply of the horizontal polishing equipment through the conductive busbar and external wires. The machine tool headstock drives the entire polishing electrode to make a feed motion along the inner hole of the variable diameter tapered tube 8 (the tube part to be processed) according to the spiral lead.

[0055] The polishing slurry is fed into the horizontal polishing equipment by a high-pressure pump set. It enters through the polishing electrode and fills the entire interior of the variable-diameter tapered tube 8 (the tube part being processed). Then it enters the polishing slurry recovery tank 18 and finally returns to the polishing slurry storage device through the return pipe 18.4 at the tail of the polishing slurry recovery tank 18.

[0056] Finally, 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 the foregoing embodiments. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An anode rotary sealing device for plasma polishing of the inner wall of a variable-diameter tapered tube, characterized in that, The device consists of three parts arranged sequentially along the same horizontal axis: a small-end rotary sealing device, a large-end rotary sealing device, and a polishing fluid recovery device. The small-end rotary sealing device and the large-end rotary sealing device are respectively installed at both ends of the variable-diameter tapered tube, and the polishing fluid recovery device is close to the end face of the large-end rotary sealing device. When polishing the inner surface of the variable-diameter tapered tube, the anode rotary sealing device is installed on the bed guide rail of the horizontal polishing equipment, and horizontal movement along the bed guide rail is realized on the guide rail. The variable-diameter tapered tube realizes rotational movement along the machine tool spindle through the anode rotary sealing device. The small-end rotary sealing device includes: a small-end O-ring, a small-end end cap, bolts and nuts, a small-end deep groove ball bearing, a small-end support, a small-end axial sealing gasket, a small-end insulating sleeve, and a small-end shaft retaining ring. The larger through holes on both sides of the inner cavity of the small-end support mate with the outer diameter of the small-end deep groove ball bearing for circumferential positioning. One end face of the small-end deep groove ball bearing mates with the inner boss surface of the small-end support for axial unidirectional positioning. The other end face of the small-end deep groove ball bearing contacts the outer boss surface of the small-end end cap for positioning. The small-end end cap is fastened to both ends of the small-end support by bolts and nuts, with shims added between them to adjust bearing clearance. The smaller shaft section of the small-end insulating sleeve... The inner diameter of the small-end deep groove ball bearing is matched to achieve circumferential positioning. The outer boss surface of the small-end insulating sleeve contacts one end face of the small-end deep groove ball bearing. The small-end shaft retaining ring is installed in the groove of the small-end shaft retaining ring on the other side of the small-end deep groove ball bearing. The two contact to achieve axial positioning. The small-end insulating sleeve is installed in the small-end support. The small-end O-ring is installed in the groove of the small-end O-ring seal. The small-end axial sealing gasket is installed in the inner boss surface of the small-end insulating sleeve to achieve sealing. One end of the reducing tapered tube is inserted into the larger diameter hole at the right end of the inner cavity of the small-end insulating sleeve. The small-end axial sealing gasket is installed between the inner boss surface of the small-end insulating sleeve and the end face of the reducing tapered tube at the right end of the inner cavity of the small-end insulating sleeve. The large-end rotary sealing device includes: a large-end end cover, a large-end deep groove ball bearing, a large-end support, a large-end inner axial sealing gasket, a large-end insulating sleeve, a large-end shaft end retaining ring, and a large-end O-ring. The larger through holes on both sides of the inner cavity of the large-end support mate with the outer diameter of the large-end deep groove ball bearing for circumferential positioning. One end face of the large-end deep groove ball bearing mates with the inner boss surface of the large-end support for axial unidirectional positioning. The other end face of the large-end deep groove ball bearing contacts the outer boss surface of the large-end end cover for positioning. The large-end end cover is fastened to both ends of the large-end support by matching bolts and nuts, with shims added between them to adjust bearing clearance. The left side of the large-end insulating sleeve is smaller. The shaft section and the smaller intermediate shaft section are fitted with the inner diameter of the large-end deep groove ball bearing to achieve circumferential positioning. The boss surface of the middle section of the large-end insulating sleeve contacts one end face of the large-end deep groove ball bearing. The other side of the large-end deep groove ball bearing is used to screw the large-end shaft end retaining ring into the threaded surface of the middle section of the large-end insulating sleeve to achieve axial positioning. The large-end insulating sleeve is installed in the large-end support, and the large-end O-ring is installed in the groove of the large-end O-ring to achieve circumferential sealing. One end of the reducing tapered tube is inserted into the larger diameter hole at the left end of the inner cavity of the large-end insulating sleeve, and an inner axial sealing gasket is installed between the boss surface of the large-end insulating sleeve and the end face of the reducing tapered tube at the left end of the inner cavity of the large-end insulating sleeve to achieve axial sealing.

2. The anode rotary sealing device for plasma polishing of the inner wall of a variable-diameter tapered tube according to claim 1, characterized in that, The small-end insulating sleeve is a stepped cylinder with a larger diameter shaft section in the middle and smaller diameter shaft sections at both ends. The two ends of the larger diameter shaft section in the middle are the outer boss surfaces of the small-end insulating sleeve. The smaller diameter shaft sections on both sides of the outer boss surface of the small-end insulating sleeve are provided with small-end shaft end retaining ring grooves. The outer boss surface of the small-end insulating sleeve corresponds to the end face of the small-end deep groove ball bearing. The inner cavity of the small-end insulating sleeve is a hollow stepped hole, with the inner cavity diameter increasing from left to right. The inner side of the hole with the smaller diameter at the left end is provided with a small-end O-ring sealing ring groove. The small-end insulating sleeve is made of plastic.

3. The anode rotary sealing device for plasma polishing of the inner wall of a variable-diameter tapered tube according to claim 1, characterized in that, The small end support adopts a combination structure of a small end flanged cylinder and a small end base. The small end flanged cylinder has a stepped hole with a smaller diameter in the middle and a larger diameter at both ends. The end face of the small end deep groove ball bearing corresponds to the inner boss surface of the small end support. Bolt holes are evenly distributed on the flanges at both ends of the small end flanged cylinder. After the small end insulating sleeve is installed into the small end flanged cylinder, small end caps are installed at both ends of the small end flanged cylinder.

4. The anode rotary sealing device for plasma polishing of the inner wall of a variable-diameter tapered tube according to claim 1, characterized in that, The large-end insulating sleeve has a stepped cylindrical shape. The diameter of the shaft sections with larger diameter decreases on both sides of the boss in the middle section of the large-end insulating sleeve. The right side of the boss in the middle section of the large-end insulating sleeve has a stepped structure with the diameter gradually decreasing in three stages. The two end faces of the boss in the middle section of the large-end insulating sleeve are the boss surface, which corresponds to the end face of the large-end deep groove ball bearing. The first-stage outer circular surface on the right side of the boss in the middle section of the large-end insulating sleeve is the threaded surface, the second-stage end face on the right side is the outer boss surface, and the third-stage outer circular surface on the right side has a groove for the large-end O-ring seal. The inner cavity of the large-end insulating sleeve is a hollow stepped hole, with the inner cavity diameter decreasing from left to right. The large-end insulating sleeve is made of plastic.

5. The anode rotary sealing device for plasma polishing of the inner wall of a variable-diameter tapered tube according to claim 1, characterized in that, The large end support adopts a combination structure of a large end flanged cylinder and a large end base. The large end flanged cylinder has a stepped hole with a smaller diameter in the middle and a larger diameter at both ends. The end face of the large end deep groove ball bearing corresponds to the inner boss surface of the large end support. Bolt holes are evenly distributed on the flanges at both ends of the large end flanged cylinder. After the large end insulating sleeve is installed into the large end flanged cylinder, large end caps are installed at both ends of the large end flanged cylinder.

6. The anode rotary sealing device for plasma polishing of the inner wall of a variable-diameter tapered tube according to claim 1, characterized in that, The polishing slurry recovery device consists of an axial sealing gasket on the outer side of the large end, a polishing slurry recovery tank, a polishing slurry recovery tank support, and a polishing slurry recovery tank clamping structure. The inner cavity of the polishing slurry recovery tank, which is closed at one end, is a stepped hole consisting of a smaller diameter section and two larger diameter sections on both sides. The surface of the smaller diameter section has a groove for an O-ring seal inside the polishing slurry recovery tank. The axial sealing gasket on the outer side of the large end is installed in the inner boss surface on the left side of the smaller diameter section of the polishing slurry recovery tank. The O-ring seal on the large end is installed in the groove for the O-ring seal inside the polishing slurry recovery tank. Axial sealing is achieved by the tight contact between the left side of the polishing slurry recovery tank and the right end face of the large end insulating sleeve. The polishing slurry recovery tank is installed in the inner cavity of the polishing slurry recovery tank support. A return pipe is installed at the tail of the polishing slurry recovery tank. Bolt holes corresponding to the polishing slurry recovery tank are opened on the polishing slurry recovery tank support. The polishing slurry recovery tank is fixed by bolts installed in the bolt holes. The polishing slurry recovery tank clamping structure corresponds to the closed end of the polishing slurry recovery tank through a pressure plate.

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