A combined machining apparatus for a stopcock valve plug

Abstract

This invention relates to the field of valve processing equipment technology, specifically disclosing a combined processing equipment for a cone valve core of a plug valve. The equipment includes a base, with two bases symmetrically arranged. A cover plate is fixedly connected to the upper surface of each base. It also includes a rough polishing mechanism fixedly mounted on the base and a fine polishing mechanism fixedly mounted on the rough polishing mechanism. After the valve core enters the processing groove, it gradually contacts and is compressed against the elastic telescopic seat at the bottom. This results in a high-pressure state inside the elastic telescopic seat after the valve core is installed, thereby transmitting its internal air pressure to the elastic telescopic rod. This causes the elastic telescopic rod to expand, pushing the clamping plate to converge and cover the top outer surface of the valve core. This achieves automatic alignment of the valve core's central axis after it enters the processing groove, ensuring that the valve core remains vertically positioned during subsequent grinding. This guarantees effective contact between the outer surface of the valve core and the rough polishing plate, thereby improving the grinding effect on the valve core.

Description

Technical Field

[0001] This invention relates to the field of valve processing equipment technology, specifically a combined processing equipment for the conical valve core of a plug valve. Background Technology

[0002] A plug valve is a type of valve that controls fluid flow by rotating a conical or cylindrical valve core. Due to its simple structure, good sealing performance, and rapid opening and closing, it is widely used in pipeline systems in the petroleum, chemical, and municipal water supply industries. The core component of the plug valve—the conical valve core—has its outer conical surface roughness, roundness, and the precision of its fit with the valve body's sealing surface, which directly determines the valve's sealing performance and operating torque. During the machining process of the valve core, after the basic contour is formed through turning and milling, the outer conical surface needs to be ground and polished to remove tool marks, reduce surface roughness, and achieve the designed sealing level.

[0003] For example, application number "CN202320603588.4" discloses a processing equipment for a variable diameter plug valve core, which can filter the fumes generated during the grinding process of the variable diameter plug valve core, preventing pollution of the working environment, reducing the threat to the health of operators, facilitating the cleaning and replacement of the filter screen, and making it more convenient to use. However, existing conical valve core grinding equipment still has the following shortcomings in practical applications: First, traditional processing methods often use open grinding, where metal powder is directly thrown into the air. Long-term inhalation by operators can easily lead to occupational diseases, and aluminum powder, iron powder, etc., pose an explosion hazard at certain concentrations. At the same time, the scattered powder is difficult to collect, resulting in a large cleaning workload, which does not meet the requirements of modern green manufacturing. Second, when clamping the valve core, due to the geometric characteristics of the conical valve core, its central axis is difficult to quickly and accurately coincide with the rotation axis of the grinding tool. If the valve core is tilted or eccentric after installation, the contact pressure between the conical surface and the grinding wheel will be uneven during grinding, leading to localized over-grinding or under-grinding. This directly affects the fit between the valve core and the valve body sealing surface, causing valve leakage. Existing equipment typically relies on manual correction or complex pneumatic chuck centering, which is cumbersome and has unstable centering accuracy. Thirdly, the processing of conical valve cores usually requires rough grinding to remove excess material, followed by fine grinding to achieve the required surface finish. In traditional processes, rough polishing and fine polishing are performed on two separate machines. After rough polishing, the valve core needs to be disassembled, transported, and re-clamped onto the fine polishing machine. This secondary clamping not only extends the production cycle but also easily introduces clamping errors, compromising the positional accuracy established during rough polishing and resulting in steps or vibration marks on the conical surface after fine polishing. Furthermore, the switching between rough and fine polishing relies on manual operation, making automated continuous processing impossible and severely restricting the efficiency and consistency of mass production. In summary, how to achieve closed dust collection, automatic clamping and centering, and integrated continuous rough and fine polishing operations during the grinding process of conical valve cores are technical problems that need to be solved by existing plug valve core processing equipment. Summary of the Invention

[0004] (a) Technical problems to be solved This invention provides a combined processing equipment for the conical valve core of a plug valve, which solves the problems mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a combined processing device for a cone valve core of a plug valve, comprising a base, two bases symmetrically arranged, a cover plate fixedly connected to the upper surface of the two bases, and further comprising: a rough polishing mechanism fixedly mounted on the base; and a fine polishing mechanism fixedly mounted on the rough polishing mechanism; wherein the rough polishing mechanism comprises a slide rod symmetrically and fixedly connected to the base, a top plate fixedly connected to the top outer surface of the slide rod, a mounting plate slidably connected to the middle outer surface of the slide rod, a connecting seat rotatably connected to the bottom surface of the mounting plate, a fixing ring rotatably connected to the bottom outer surface of the connecting seat, and the bottom surface of the fixing ring fixedly inserted into the upper surface of the cover plate, wherein a processing groove is provided on one side of the two bases that are close to each other, and a rough polishing plate is slidably inserted through the inner surface of the processing groove, wherein six rough polishing plates are provided.

[0006] According to one embodiment of the present invention, the top of the connecting seat is disposed through the mounting plate, a transmission belt is rotatably connected to the outer surface of the top of the connecting seat, a drive wheel is rotatably connected to the upper edge of the mounting plate, one end of the transmission belt away from the connecting seat is rotatably connected to the outer surface of the drive wheel, a motor is fixedly connected to the lower edge of the mounting plate, and the drive wheel is rotatably connected to the output end of the motor, wherein a hydraulic device is externally connected to the upper surface of the mounting plate.

[0007] According to one embodiment of the present invention, a bottom ring is fixedly connected to the inner bottom surface of the two bases, a chip removal groove is provided through the upper surface of the bottom ring, an elastic telescopic seat is fixedly connected to the inner surface of the bottom ring, and a No. 1 air pipe is connected through the outer surfaces of both sides of the elastic telescopic seat.

[0008] According to one embodiment of the present invention, a mounting ring is fixedly embedded through the upper surface of the middle part of the cover plate, and an elastic telescopic rod is fixedly connected through the mounting ring. The elastic telescopic rod is also fixedly embedded inside the cover plate, and six elastic telescopic rods are arranged at fixed intervals around the mounting ring. A connecting pipe is fixedly connected between the six elastic telescopic rods. A clamp is fixedly connected to the output end of the elastic telescopic rod. The clamp is set to be arc-shaped. A second air pipe is fixedly connected to the outer end of the elastic telescopic rod, wherein the second air pipe is connected to the first air pipe through a flexible tube.

[0009] According to one embodiment of the present invention, the fine polishing mechanism includes a sealing tube, which is fixedly embedded in the upper surface of the two bases. The sealing tube is tapered, and the outer end of the coarse polishing plate does not contact the inner surface of the sealing tube. The bottom surface of the coarse polishing plate slides against the upper surface of the bottom ring, and the interior of the coarse polishing plate is hollow, while both ends of the coarse polishing plate are open.

[0010] According to one embodiment of the present invention, the connecting seat is configured to be elastically telescopic, the elasticity of the connecting seat is greater than that of the elastic telescopic seat, a connecting block is fixedly connected to the lower surface of the cover plate, the connecting block is disposed at the top of the cavity between the base and the sealing tube, six connecting blocks are provided, and a connecting ring is fixedly connected between the six connecting blocks, and a rotating wheel is rotatably connected to the outer surface of the connecting ring at a fixed interval.

[0011] According to one embodiment of the present invention, a limiting groove is formed through the top side surface of the coarse polishing plate, the connecting ring is arranged transversely through the limiting groove, the rotating wheel is arranged inside the coarse polishing plate, and the top of the rotating wheel is rotatably connected to the top inner surface of the coarse polishing plate.

[0012] According to one embodiment of the present invention, a fine polishing plate is rotatably connected to the bottom of the rotating wheel, and the fine polishing plate is slidably connected to the inner surface of the coarse polishing plate, wherein the fine polishing plate and the coarse polishing plate are offset from each other.

[0013] According to one embodiment of the present invention, an elastic telescopic plate is fixedly connected to the outer end of the polishing plate, the outer end of the elastic telescopic plate is fixedly connected to the inner surface of the sealing tube, and the internal cavity of the elastic telescopic plate communicates with the internal cavity of the connecting seat.

[0014] When the outer surface of the conical valve core needs to be ground, the top of the valve core can be fixedly connected to the bottom center of the connecting seat. Then, the external hydraulic equipment is driven to push the mounting plate down along the slide rod. After the mounting plate has moved down, the connecting seat, carrying the valve core, enters the machining groove between the two bases. Then, the motor is started. After the motor starts, it will drive the transmission belt to rotate through the drive wheel, thereby driving the connecting seat to rotate on the bottom surface of the mounting plate. This causes the valve core in the machining groove to rotate. When the valve core enters the machining groove, it will fit against the inner end of the coarse polishing plate. At this time, as the valve core rotates, relative friction occurs between the valve core and the coarse polishing plate, thus grinding the outer surface of the valve core. After the valve core enters the machining groove, the fixing ring is fixedly inserted into the upper surface of the cover plate. At this time, the upper surface of the cover plate is sealed by the fixing ring, and the two bases are sealed by the sealing tube.

[0015] (III) Beneficial Effects This invention provides a combined processing device for the conical valve core of a plug valve. It has the following beneficial effects: (I) The combined processing equipment for the cone valve core of the plug valve has a processing groove that is connected to the outside only through the chip removal groove on the bottom ring. This allows for control of the metal powder during the grinding process, avoiding the safety hazards caused by the metal powder generated during the grinding process being thrown into the air. At the same time, the metal powder is automatically collected by gravity through the chip removal groove, which greatly reduces the difficulty of cleaning after processing.

[0016] (II) This combined processing equipment for the conical valve core of the plug valve gradually contacts and squeezes the elastic telescopic seat at the bottom after the valve core enters the processing groove. This results in the elastic telescopic seat being in a high-pressure state after the valve core is installed, which in turn transmits the internal air pressure to the elastic telescopic rod, causing the elastic telescopic rod to expand. This pushes the clamping plate to gather and cover the top outer surface of the valve core, so that the valve core automatically matches its central axis after entering the processing groove. This ensures that the valve core is always set vertically during subsequent grinding, which guarantees effective contact between the outer surface of the valve core and the coarse polishing plate, thereby improving the grinding effect of the valve core.

[0017] (III) This combined processing equipment for the conical valve core of the plug valve can continue to drive the hydraulic equipment to press down the mounting plate after rough polishing. At this time, the valve core cannot move further down, and the connecting seat begins to be squeezed and contracted, thereby transmitting its internal air pressure to the elastic telescopic plate, causing the elastic telescopic plate to expand. This pushes the fine polishing plate close to the outer surface of the valve core. As the fine polishing plate moves, it drives the rotating wheel on its top to rotate, thereby driving the rough polishing plate to move outward. Finally, the inner end of the fine polishing plate is attached to the outer surface of the valve core, while the rough polishing plate automatically disengages from the valve core. This allows for a quick switch between polishing methods after rough polishing, greatly improving the applicability of this equipment and avoiding the need for two separate machines for rough and fine polishing of the valve core. It also greatly improves the production efficiency of enterprises. After polishing, the motor can be turned off, and the valve core stops rotating. The valve core can be quickly removed by pulling the mounting plate up with the hydraulic equipment, and the next valve core to be polished can be quickly switched, greatly improving the working continuity of this equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the mounting plate of the present invention; Figure 3 This is a schematic diagram of the mounting ring structure of the present invention; Figure 4 This is a schematic diagram of the structure of the elastic telescopic rod of the present invention; Figure 5 This is a schematic diagram of the structure of the sealing tube of the present invention; Figure 6 This is a schematic diagram of the structure of the coarse polishing plate of the present invention; Figure 7 This is a schematic diagram of the structure of the bottom ring of the present invention; Figure 8 This is a schematic diagram of the structure of the polishing plate of the present invention.

[0019] In the diagram: 1. Base; 2. Cover plate; 3. Rough polishing mechanism; 31. Slide rod; 32. Top plate; 33. Mounting plate; 34. Connecting seat; 35. Fixing ring; 36. Processing groove; 37. Rough polishing plate; 38. Transmission belt; 39. Drive wheel; 310. Motor; 311. Bottom ring; 312. Chip removal groove; 313. Elastic telescopic seat; 314. No. 1 air pipe; 315. Mounting ring; 316. Elastic telescopic rod; 317. Connecting pipe; 318. Clamping plate; 319. No. 2 air pipe; 4. Fine polishing mechanism; 41. Sealing pipe; 42. Connecting block; 43. Connecting ring; 44. Rotating wheel; 45. Limiting groove; 46. Fine polishing plate; 47. Elastic telescopic plate. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] First embodiment: as follows Figures 1 to 8 As shown, the present invention provides a technical solution: a combined processing device for a cone valve core of a plug valve, comprising a base 1, two bases 1 symmetrically arranged, a cover plate 2 fixedly connected to the upper surface of the two bases 1, and further comprising: The roughing mechanism 3 is fixedly installed on the base 1; Fine polishing mechanism 4 is fixedly installed on rough polishing mechanism 3; The coarse polishing mechanism 3 includes a slide rod 31, which is symmetrically and fixedly connected to the base 1. A top plate 32 is fixedly connected to the top outer surface of the slide rod 31. A mounting plate 33 is slidably connected to the middle outer surface of the slide rod 31. A connecting seat 34 is rotatably connected to the bottom surface of the mounting plate 33. A fixing ring 35 is rotatably connected to the bottom outer surface of the connecting seat 34. The bottom surface of the fixing ring 35 is fixedly inserted into the upper surface of the cover plate 2. A processing groove 36 is opened on one side of the two bases 1 that are close to each other. A coarse polishing plate 37 is slidably inserted through the inner surface of the processing groove 36. Six coarse polishing plates 37 are provided.

[0022] The top of the connecting seat 34 is provided through the mounting plate 33. A transmission belt 38 is rotatably connected to the top outer surface of the connecting seat 34. A drive wheel 39 is rotatably connected through the upper edge of the mounting plate 33. The end of the transmission belt 38 away from the connecting seat 34 is rotatably connected to the outer surface of the drive wheel 39. A motor 310 is fixedly connected to the lower edge of the mounting plate 33. The drive wheel 39 is rotatably connected to the output end of the motor 310. A hydraulic device is externally connected to the upper surface of the mounting plate 33.

[0023] Bottom rings 311 are fixedly connected to the inner bottom surfaces of the two bases 1. A chip removal groove 312 is provided through the upper surface of the bottom rings 311. An elastic telescopic seat 313 is fixedly connected to the inner surface of the bottom rings 311. A No. 1 air pipe 314 is connected through the outer surfaces of both sides of the elastic telescopic seat 313.

[0024] An installation ring 315 is fixedly embedded through the upper surface of the middle part of the cover plate 2. An elastic telescopic rod 316 is fixedly connected through the installation ring 315. The elastic telescopic rod 316 is also fixedly embedded inside the cover plate 2. Six elastic telescopic rods 316 are arranged at fixed intervals around the installation ring 315. A connecting pipe 317 is fixedly connected between the six elastic telescopic rods 316. A clamping plate 318 is fixedly connected to the output end of the elastic telescopic rod 316. The clamping plate 318 is set in an arc shape. A second air pipe 319 is fixedly connected to the outer end of the elastic telescopic rod 316. The second air pipe 319 is connected to the first air pipe 314 through a flexible tube.

[0025] Second embodiment: as follows Figures 1 to 8 As shown, the fine polishing mechanism 4 includes a sealing tube 41, which is fixedly embedded on the upper surface of the two bases 1. The sealing tube 41 is tapered. The outer end of the coarse polishing plate 37 does not contact the inner surface of the sealing tube 41. The bottom surface of the coarse polishing plate 37 slides against the upper surface of the bottom ring 311. The interior of the coarse polishing plate 37 is hollow, and both ends of the coarse polishing plate 37 are open.

[0026] The connecting seat 34 is configured to be elastically telescopic, and the elasticity of the connecting seat 34 is greater than that of the elastic telescopic seat 313. The lower surface of the cover plate 2 is fixedly connected to the connecting block 42. The connecting block 42 is located at the top of the cavity between the base 1 and the sealing tube 41. There are six connecting blocks 42, and the six connecting blocks 42 are fixedly connected to each other by a connecting ring 43. The outer surface of the connecting ring 43 is rotatably connected to a rotating wheel 44 at a fixed interval.

[0027] A limiting groove 45 is formed through the top side surface of the coarse polishing plate 37. A connecting ring 43 is set across the limiting groove 45. A rotating wheel 44 is set inside the coarse polishing plate 37, and the top of the rotating wheel 44 is rotatably connected to the top inner surface of the coarse polishing plate 37.

[0028] A fine polishing plate 46 is rotatably connected to the bottom of the rotating wheel 44. The fine polishing plate 46 is slidably connected to the inner surface of the coarse polishing plate 37, wherein the fine polishing plate 46 and the coarse polishing plate 37 are offset from each other.

[0029] An elastic telescopic plate 47 is fixedly connected to the outer end of the polishing plate 46. The outer end of the elastic telescopic plate 47 is fixedly connected to the inner surface of the sealing tube 41. The internal cavity of the elastic telescopic plate 47 is connected to the internal cavity of the connecting seat 34.

[0030] During operation, when the outer surface of the conical valve core needs to be ground, the top of the valve core is fixedly connected to the bottom center of the connecting seat 34. Then, the external hydraulic equipment is driven to press the mounting plate 33 down along the slide rod 31. After the mounting plate 33 has moved down, the connecting seat 34, carrying the valve core, enters the machining groove 36 between the two bases 1. Then, the motor 310 is started. After the motor 310 starts, it drives the transmission belt 38 to rotate through the drive wheel 39, thereby causing the connecting seat 34 to rotate on the bottom surface of the mounting plate 33. This causes the valve core in the machining groove 36 to rotate. When the valve core enters the machining groove 36, it will be in contact with the inner end of the coarse polishing plate 37. At this time, as the valve core rotates, relative friction occurs between the valve core and the coarse polishing plate 37, thus grinding the outer surface of the valve core. After the valve core enters the machining groove 36 during grinding, the fixing ring 35 is fixedly inserted into the upper surface of the cover plate 2. At this time, the upper surface of the cover plate 2 is sealed by the fixing ring 35, and the two bases 1 are sealed by the sealing tube 41. The machining groove 36 is only connected to the outside through the chip discharge groove 312 on the bottom ring 311, which realizes the control of metal powder during grinding and avoids the safety hazards caused by metal powder generated during grinding being thrown into the air. At the same time, the metal powder is automatically collected by falling through the chip discharge groove 312 by gravity, which greatly reduces the cleaning difficulty after processing. After the valve core enters the machining groove 36, it will gradually come into contact with and be squeezed by the elastic telescopic seat 313 at the bottom, thereby making the valve core installed. After completion, the interior of the elastic telescopic seat 313 is under high pressure, thereby transmitting its internal air pressure to the elastic telescopic rod 316, causing the elastic telescopic rod 316 to expand. This pushes the clamping plate 318 to converge and cover the top outer surface of the valve core, achieving automatic alignment with its central axis after the valve core enters the machining groove 36. This ensures that the valve core remains vertically positioned during subsequent grinding, guaranteeing effective contact between the outer surface of the valve core and the coarse polishing plate 37, thus improving the grinding effect on the valve core. After coarse polishing, the hydraulic equipment can continue to press down the mounting plate 33. At this point, the valve core cannot move further down, causing the connecting seat 34 to begin to be squeezed and contracted. This transmits its internal air pressure to the elastic telescopic plate 47, causing the elastic telescopic plate 47 to expand, thereby pushing the fine polishing plate 318 to converge and cover the top outer surface of the valve core. The polishing plate 46 is close to the outer surface of the valve core. As the fine polishing plate 46 moves, it drives the rotating wheel 44 on top of it to rotate, which in turn drives the coarse polishing plate 37 to move outward. Finally, the inner end of the fine polishing plate 46 is in contact with the outer surface of the valve core, while the coarse polishing plate 37 automatically disengages from the valve core. This allows for a quick switch between polishing methods after coarse polishing, greatly improving the applicability of the equipment and avoiding the need for two separate machines for polishing valve cores, as is the traditional method. It also significantly improves the production efficiency of enterprises. After polishing is completed, the motor 310 can be turned off. At this time, the valve core stops rotating, and the valve core can be quickly removed by pulling the mounting plate 33 upward with hydraulic equipment. The next valve core to be polished can also be quickly switched, greatly improving the continuity of the equipment's operation.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A combined machining apparatus for a stopcock valve cone, comprising a base (1), characterized in that: Two bases (1) are symmetrically arranged, and a cover plate (2) is fixedly connected to the upper surface of the two bases (1). The bases also include: A coarse polishing mechanism (3) is fixedly installed on a base (1); Fine polishing mechanism (4), which is fixedly installed on rough polishing mechanism (3); The rough polishing mechanism (3) includes a slide rod (31), which is symmetrically and fixedly connected to the base (1). A top plate (32) is fixedly connected to the top outer surface of the slide rod (31), and a mounting plate (33) is slidably connected to the middle outer surface of the slide rod (31). A connecting seat (34) is rotatably connected to the bottom surface of the mounting plate (33), and a fixing ring (35) is rotatably connected to the bottom outer surface of the connecting seat (34). The bottom surface of the fixing ring (35) is fixedly inserted into the upper surface of the cover plate (2). A processing groove (36) is opened on one side of the two bases (1) that are close to each other. A rough polishing plate (37) is slidably inserted through the inner surface of the processing groove (36), and six rough polishing plates (37) are provided.

2. A combination machine for machining a plug valve cone as defined in claim 1, wherein: The top of the connecting seat (34) is provided through the mounting plate (33). A transmission belt (38) is rotatably connected to the top outer surface of the connecting seat (34). A drive wheel (39) is rotatably connected to the upper edge of the mounting plate (33). One end of the transmission belt (38) away from the connecting seat (34) is rotatably connected to the outer surface of the drive wheel (39). A motor (310) is fixedly connected to the lower edge of the mounting plate (33). The drive wheel (39) is rotatably connected to the output end of the motor (310). A hydraulic device is externally connected to the upper surface of the mounting plate (33).

3. A combination machining apparatus for a plug valve taper spool as defined in claim 2, wherein: Bottom inner surfaces of the two bases (1) are fixedly connected to bottom rings (311), and chip removal grooves (312) are opened through the upper surface of the bottom rings (311). Elastic telescopic seats (313) are fixedly connected to the inner surface of the bottom rings (311), and No. 1 air pipes (314) are connected through the outer surfaces of both sides of the elastic telescopic seats (313).

4. A combination machining apparatus for a plug valve taper spool as defined in claim 3, wherein: An installation ring (315) is fixedly embedded through the upper surface of the middle part of the cover plate (2). An elastic telescopic rod (316) is fixedly connected through the installation ring (315). The elastic telescopic rod (316) is also fixedly embedded inside the cover plate (2). Six elastic telescopic rods (316) are arranged at fixed intervals around the installation ring (315). A connecting pipe (317) is fixedly connected between the six elastic telescopic rods (316). A clamp (318) is fixedly connected to the output end of the elastic telescopic rod (316). The clamp (318) is set in an arc shape. A second air pipe (319) is fixedly connected to the outer end of the elastic telescopic rod (316). The second air pipe (319) is connected to the first air pipe (314) through a flexible tube.

5. A combination machining apparatus for a plug valve taper spool as defined in claim 4 wherein: The fine polishing mechanism (4) includes a sealing tube (41), which is fixedly embedded on the upper surface of the two bases (1). The sealing tube (41) is tapered. The outer end of the coarse polishing plate (37) does not contact the inner surface of the sealing tube (41). The bottom surface of the coarse polishing plate (37) slides against the upper surface of the bottom ring (311). The interior of the coarse polishing plate (37) is hollow, and both ends of the coarse polishing plate (37) are open.

6. A combination machining apparatus for a plug valve taper spool as defined in claim 5 wherein: The connecting seat (34) is configured to be elastically telescopic. The elasticity of the connecting seat (34) is greater than that of the elastic telescopic seat (313). A connecting block (42) is fixedly connected to the lower surface of the cover plate (2). The connecting block (42) is located at the top of the cavity between the base (1) and the sealing tube (41). There are six connecting blocks (42). A connecting ring (43) is fixedly connected between the six connecting blocks (42). A rotating wheel (44) is rotatably connected to the outer surface of the connecting ring (43) at a fixed interval.

7. A combination machining apparatus for a plug valve taper spool as defined in claim 6 wherein: A limiting groove (45) is provided through the top side surface of the coarse polishing plate (37), the connecting ring (43) is provided across the limiting groove (45), the rotating wheel (44) is provided inside the coarse polishing plate (37), and the top of the rotating wheel (44) is rotatably connected to the top inner surface of the coarse polishing plate (37).

8. A combination machining apparatus for a plug valve taper spool as defined in claim 7, wherein: The bottom of the rotating wheel (44) is rotatably connected to a fine polishing plate (46), which is slidably connected to the inner surface of the coarse polishing plate (37), wherein the fine polishing plate (46) and the coarse polishing plate (37) are misaligned.

9. A combination machining apparatus for a plug valve taper spool as defined in claim 8, wherein: The outer end of the polishing plate (46) is fixedly connected to an elastic telescopic plate (47), the outer end of the elastic telescopic plate (47) is fixedly connected to the inner surface of the sealing tube (41), and the inner cavity of the elastic telescopic plate (47) is connected to the inner cavity of the connecting seat (34).

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