Rotary grinding and polishing jig for tube shell

Abstract

The utility model relates to the technical field of grinding machining and discloses a tube shell rotating grinding and polishing jig which comprises a supporting structure used for being installed on a rotating shaft and driven by the rotating shaft to rotate around the axis, clamping parts used for installing and positioning a tube shell and a rotating unit used for driving each clamping part to rotate around the axis of the clamping part. The multiple clamping parts are distributed on the periphery of the supporting structure at intervals. Through cooperation among the supporting structure, the clamping parts and the rotating unit, the supporting structure can contain and install a plurality of tube shells at the same time, and when an external rotating shaft drives the supporting structure to rotate, the rotating unit enables the clamping parts to rotate under rotation of the supporting structure; and therefore, the outer grinding disc sequentially grinds the tube shells on the clamping parts, the polishing efficiency is improved, the polishing of the multiple tube shells can be completed without replacing consumables, and the cost is effectively saved.

Description

Technical Field

[0001] The utility model relates to the technical field of grinding processing, in particular to a tube shell rotating grinding and polishing jig. Background Art

[0002] As a tube shell product, the polishing process of the electronic cigarette shell involves multiple steps and processes to ensure its appearance and quality. Polishing is the last step in the processing of the electronic cigarette shell. It is a processing method that uses mechanical, chemical or electrochemical effects to reduce the surface roughness of the electronic cigarette shell to obtain a bright and flat surface, making the surface of the electronic cigarette shell smoother and ensuring that the product contour has no collapsed edges, no vibration lines, coarse wires and other problems, so as to achieve the brightness and contour required by the product and improve the overall aesthetics and texture.

[0003] The polishing of existing electronic cigarette shells usually uses a five-axis machine. The upper machine platform of the five-axis machine is equipped with a product positioning fixture and a motor sandpaper disc. After the product is placed on the fixture, the product positioning fixture drives the product to rotate around the axis, and the motor sandpaper disc polishes the product surface by high-speed rotation. However, the existing product positioning fixture for electronic cigarette shells can only position one electronic cigarette shell at a time, and the installation and removal of the product takes time, resulting in low overall processing efficiency; and the motor sandpaper disc consumes sandpaper and pure water during polishing, and the product is wet polished, resulting in high overall costs. Utility Model Content

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a tube shell rotating grinding and polishing jig to solve the problems of low grinding efficiency and high cost of the existing electronic cigarette shell positioning jig.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a tube shell rotating grinding and polishing jig including a support structure for being installed on a rotating shaft and driven by it to rotate around the axis, a clamping part for installing and positioning the tube shell, and a rotating unit for driving each of the clamping parts to rotate around its own axis. The clamping parts are arranged in multiples and are distributed at intervals on the periphery of the support structure so that multiple tube shells can be installed at the same time, and the support structure is driven to rotate by the rotating shaft so that each tube shell can be polished, thereby reducing the cost of consumables and improving processing efficiency.

[0006] Furthermore, the support structure includes a base plate for installation on a rotating shaft, an intermediate support column installed on the base plate along an axial direction, and a cover plate connected to the intermediate support column. An annular installation space is formed between the base plate, the intermediate support column and the cover plate. The two ends of each clamping portion are respectively rotatably connected to the base plate and the cover plate and are distributed in an annular array around the intermediate support column so as to accommodate and install multiple tube shells at the same time, and at the same time facilitate the external grinding wheel to grind each tube shell in the annular installation space in sequence during the rotation of the support structure.

[0007] Furthermore, each of the clamping parts includes a sleeve rod having one end rotatably connected to the base plate to rotate around the axis and used to be inserted into the tube shell. The sleeve rod has a lower limit portion for supporting the tube shell on one end close to the base plate, and the other end of the sleeve rod is arranged toward the cover plate, thereby facilitating the tubular product to be sleeved on the sleeve rod for installation.

[0008] Furthermore, each of the clamping parts also includes an upper limit portion rotatably connected to the cover plate to rotate around the axis, and the upper limit portion is detachably connected to an end of the sleeve rod close to the cover plate along the axial direction to facilitate the separation of the sleeve rod and the cover plate, thereby facilitating the installation and disassembly of the tube shell and ensuring the rotation of the sleeve rod.

[0009] Furthermore, the upper limit portion has a head portion rotatably connected to the cover plate and a rod portion fixedly connected to the head portion and connected to a sleeve rod key, and the sleeve rod has a key slot for the rod portion to be keyed therein, and through the cooperation between the rod portion and the key slot, a detachable cooperation between the sleeve rod and the upper limit portion is achieved, so as to facilitate the installation and disassembly of the tube shell, and the cooperation between the upper limit portion and the sleeve rod will not affect the rotation of the sleeve rod.

[0010] Furthermore, the rotating unit is defined as a transmission unit that synchronously drives each clamping part to rotate as the supporting structure rotates; the transmission unit includes a first gear that is coaxially and rotatably connected to the intermediate supporting column and a plurality of second gears that are rotatably connected to the cover plate and are respectively coaxially connected to each upper limit portion, and each second gear is meshed with the first gear so that the sleeve rod and the second gear can rotate coaxially and synchronously; the transmission unit also includes a locking portion for locking the first gear when the supporting structure rotates, so that the supporting structure rotates relative to the first gear and each second gear rotates in the same direction as the supporting structure around the periphery of the first gear, so that when the rotating shaft drives the supporting structure to rotate, each second gear is frictionally meshed with the first gear to achieve transmission and rotate each sleeve rod.

[0011] Furthermore, a through hole is axially penetrated on the cover plate and is opposite to the first gear. The locking portion has a locking end that can pass through the through hole and lock the first gear, so as to limit the rotation of the first gear when the rotating shaft drives the supporting structure to rotate, thereby making the second gear that rotates around the first gear with the supporting structure frictionally engage with the first gear to achieve self-rotation.

[0012] Furthermore, the locking end includes a downward pressing arc block bent around the axis of the first gear, and a positioning groove is axially opened on the first gear for the downward pressing arc block to pass through and limit the rotation of the downward pressing arc block. The rotation of the first gear is limited by simple insertion to ensure the rotation of the second gear.

[0013] Furthermore, the intermediate support column has a lifting portion, which extends in a radial direction to form a plurality of connecting arms, each of which is detachably connected to the cover plate, and the first gear is rotatably connected to the lifting portion, thereby ensuring that the first gear can cooperate with the downward-pressing arc block while the intermediate support column and the cover plate are connected.

[0014] Furthermore, the support structure also includes positioning columns with two ends respectively inserted into the bottom plate and the cover plate along the axial direction to improve the stability between the cover plate and the bottom plate.

[0015] The tube shell rotary grinding and polishing jig of the utility model has at least the following beneficial effects: through the cooperation between the supporting structure, the clamping part and the rotating unit, a plurality of tube shells can be accommodated and installed on the supporting structure at the same time, and when the external rotating shaft drives the supporting structure to rotate, the rotating unit causes each clamping part to rotate under the rotation of the supporting structure, so that the external grinding wheel grinds the tube shells on each clamping part in turn, which not only improves the polishing efficiency, but also the polishing of multiple tube shells can be completed without replacing consumables, effectively reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the utility model from another angle;

[0019] Figure 3 This is a schematic diagram of the structure of the locking part of the utility model when locking the first gear;

[0020] Figure 4 It is an exploded view of the utility model;

[0021] Figure 5 It is an exploded view of the utility model from another angle;

[0022] Figure 6 It is an exploded view of the clamping part of the utility model.

[0023] The meanings of the symbols in the accompanying drawings are:

[0024] Support structure-1; bottom plate-11; middle support column-12; lifting part-121; connecting arm-122; boss-123; cover plate-13; through hole-131; positioning column-14; first sunken groove-15; second sunken groove-16; clamping part-2; sleeve rod-21; lower limit part-211; keyway-212; upper limit part-22; head-221; rod-222; bearing-23; rotating unit-3; first gear-31; positioning through groove-311; second gear-32; locking part-33; pressing block-331; downward pressing arc block-332. DETAILED DESCRIPTION

[0025] The utility model will be further described below in conjunction with the accompanying drawings.

[0026] like Figures 1 to 6 As shown, the tube shell rotary grinding and polishing jig of the utility model includes a support structure 1, a clamping part 2 and a rotating unit 3. The support structure 1 is used to be installed on an external rotating shaft and driven by the rotating shaft to rotate around the axis of the support structure 1. The clamping part 2 is installed on the support structure 1 and is used to install and position the tube shell-like structure product (hereinafter referred to as "tube shell"). The rotating unit 3 is used to drive the clamping part 2 to rotate around the axis of the clamping part 2 itself when the support structure 1 rotates, so that the tube shell installed on the clamping part 2 can be polished by the external grinding disc while rotating with the rotation of the support structure 1, so as to ensure that the surface of the tube shell is flat and smooth. It should be noted that the tube shell refers to a product with a tubular structure that is hollow inside and penetrates at both ends along the axial direction, such as an electronic cigarette shell.

[0027] In this embodiment, the support structure 1 includes a base plate 11 for installation on the rotating shaft, an intermediate support column 12 installed on the base plate 11 along the axial direction, and a cover plate 13 connected to the intermediate support column 12. The base plate 11, the intermediate support column 12 and the cover plate 13 are connected in sequence from bottom to top along the vertical direction and arranged coaxially. In actual use, the cover plate 13 is used to be coaxially connected with the external rotating shaft to be able to drive the entire support structure 1 to rotate around the axis. It should be noted that the rotating shaft is the rotating shaft inside the machine platform on the five-axis machine equipment. There is a motor sandpaper grinding disc inside the machine platform and is located on the side of the support structure 1, so that after the tube shell is installed on the support structure 1, the grinding disc can grind the tube shell.

[0028] In the content defined in this embodiment, the bottom plate 11 and the cover plate 13 are both cylindrical plate-like structures, and the intermediate support column 12 is a cylindrical rod-like structure with a diameter smaller than the diameters of the bottom plate 11 and the cover plate 13, so that the periphery of the bottom plate 11, the intermediate support column 12 and the cover plate 13 is surrounded by an annular installation space that is radially open outward, and the clamping part 2 is arranged in the annular installation space, so that the grinding wheel can grind and polish the tube shell on the clamping part 2 in the annular installation space. In order to facilitate the installation of the tube shell on the clamping part 2 in the annular installation space, the cover plate 13 is detachably connected to the intermediate support column 12. Preferably, the cover plate 13 is detachably connected to the intermediate support column 12 along the axial direction of the intermediate support column 12, so that the cover plate 13 can be disassembled along the axial direction toward the side away from the bottom plate 11, so as not to hinder the setting of the clamping part 2. In order to improve the stability between the intermediate support column 12 and the cover plate 13 and the bottom plate 11, and prevent the cover plate 13 from tilting relative to the intermediate support column 12, the support structure 1 also includes a positioning column 14 with two ends respectively inserted in the bottom plate 11 and the cover plate 13 along the axial direction, and the positioning column 14 is provided in multiple and spaced apart in the annular installation space. A first positioning groove adapted to the bottom end of the positioning column 14 is provided on the top surface of the bottom plate 11 at the position corresponding to each positioning column 14, and the bottom end of each positioning column 14 is respectively inserted in each first positioning groove. The positioning column 14 can also be fixedly connected to the bottom plate 11. A second positioning groove for the top end of the positioning column 14 to pass through is provided on the cover plate 13 at the position corresponding to each first positioning groove, and the top end of each positioning column 14 is respectively inserted in each second positioning groove, so as to play a supporting role between the cover plate 13 and the bottom plate 11 to a certain extent and improve stability. The top of the positioning column 14 has a tapered guide end that gradually narrows toward the cover plate 13, so that the guide end can be quickly inserted into the second positioning groove. The cooperation of multiple positioning columns 14 can achieve the purpose of rapid positioning and alignment when the cover plate 13 is installed on the intermediate support column 12. It should be noted that the positioning column 14 is located near the intermediate support column 12 relative to the clamping part 2 to avoid the positioning column 14 affecting the polishing of the tube shell on the clamping part 2 by the grinding disc.

[0029] In this embodiment, the clamping parts 2 are arranged in a plurality and are distributed in a circular array around the middle support column 12 in the circular installation space, so that the clamping parts 2 are spaced apart on the outward circle of the support structure 1, and the two ends of each clamping part 2 are rotatably connected to the base plate 11 and the cover plate 13, so that each clamping part 2 can rotate with the base plate 11 and can rotate independently at the same time, so that after the tube shell is installed on the clamping part 2, each clamping part 2 can be driven to rotate around its own axis through the rotating unit 3.

[0030] In the content defined in this embodiment, each clamping part 2 includes a sleeve rod 21 with one end rotatably connected to the bottom plate 11 to rotate around the axis and an upper limit portion 22 rotatably connected to the cover plate 13 to rotate around the axis. The sleeve rod 21 is used to be inserted into the tube shell, and the other end of the tube shell is arranged toward the cover plate 13, so that the tube shell is located in the annular installation space when installed on the sleeve rod 21; the upper limit portion 22 is detachably connected to one end of the sleeve rod 21 close to the cover plate 13 in the axial direction, so that when the cover plate 13 is removed, the upper limit portion 22 can be removed together with the cover plate 13 in the axial direction, so as to facilitate the installation or removal of the tube shell on the sleeve rod 21. The sleeve rod 21 is a cylindrical rod-shaped structure, and has a lower limit portion 211 on one end of the sleeve rod 21 close to the bottom plate 11 for supporting the tube shell to limit the tube shell from continuing to move downward. The lower limit portion 211 is formed by the outer periphery of the bottom end of the sleeve rod 21 protruding in the axial direction. In order to realize the rotational cooperation between the bottom end of the sleeve rod 21 and the bottom plate 11, a plurality of first sunken grooves 15 corresponding to the sleeve rod 21 and distributed in a circular array are provided on the bottom plate 11, and a bearing 23 is fixedly installed in each first sunken groove 15. The bottom end of the sleeve rod 21 is fixedly connected to the inner ring of the corresponding bearing 23, so that the sleeve rod 21 can rotate relative to the bottom plate 11. In order to facilitate the rapid sleeve installation of the tube shell on the sleeve rod 21, the sleeve rod 21 is tapered and gradually narrowed at one end close to the cover plate 13. The upper limit portion 22 has a head portion 221 rotatably connected to the cover plate 13 and a rod portion 222 fixedly connected to the head portion 221 and keyed to the sleeve rod 21. A plurality of second sunken grooves 16 corresponding to each head portion 221 and distributed in a circular array are provided on the cover plate 13. Each second sunken groove 16 is distributed in a mirror image with each first sunken groove 15, and a bearing 23 is also fixedly connected in each second sunken groove 16. The head portion 221 is fixedly connected to the bearing 23 in the corresponding second sunken groove 16 so that the head portion 221 can rotate relative to the cover plate 13. The head 221 may be a cylindrical structure, and the head 221 is coaxial with the sleeve rod 21 when the rod 222 is keyed to the sleeve rod 21. In order to prevent the tube shell from jumping during the grinding process, the distance between the head 221 and the lower limit portion 211 may be equal to the length of the tube shell, so that after the tube shell is sleeved on the sleeve rod 21 and supported on the lower limit portion 211, the head 221 can press down the tube shell after the rod 222 is keyed to the sleeve rod 21. The sleeve rod 21 has a key slot 212 for the rod 222 to be keyed therein. The shape of the key slot 212 is adapted to the shape of the rod 222 and can be a polygonal column, so that after the rod 222 is inserted into the key slot 212, the upper limit portion 22 can rotate synchronously with the sleeve rod 21. At the same time, the key connection method is relatively simple and convenient to install and disassemble.

[0031] In this embodiment, the rotating unit 3 is defined as a transmission unit that synchronously drives the rotation of each clamping part 2 as the supporting structure 1 rotates, so that when the base plate 11 rotates driven by the rotating shaft, the transmission unit causes each clamping part 2 to rotate synchronously and in the same direction, so that the tube shell on each clamping part 2 can pass through the grinding wheel, and the grinding wheel can grind and polish each position of the tube shell through rotation.

[0032] In the content defined in this embodiment, the transmission unit includes a first gear 31 that is coaxially and rotatably connected to the intermediate support column 12, a plurality of second gears 32 that are rotatably connected to the cover plate 13 and are respectively coaxially connected to each upper limit portion 22, and a locking portion 33 for locking the first gear 31 when the support structure 1 rotates. Each second gear 32 is distributed in a ring array relative to the first gear 31 and is meshed with the first gear 31. The locking portion 33 is used to limit the rotation of the first gear 31 when the base plate 11, the intermediate support column 12, the cover plate 13 and the clamping portion 2 of the support structure 1 rotate, so that the second gear 32 rotates through frictional engagement with the first gear 31 when rotating with the support structure 1, thereby driving the upper limit portion 22 and the sleeve rod 21 connected thereto to rotate, so that the support structure 1 rotates relative to the first gear 31, and each second gear 32 rotates in the same direction as the support structure 1 around the periphery of the first gear 31. The first gear 31 is mounted on the top of the middle support column 12 and coaxially distributed with the middle support column 12. The diameter of the first gear 31 is larger than the diameter of the second gear 32 so as to be able to mesh with each second gear 32. In order to enable the locking portion 33 to lock the first gear 31 without affecting the rotation of the support structure 1, a through hole 131 is axially penetrated on the cover plate 13 and is directly opposite to the first gear 31. The through hole 131 is coaxial with the cover plate 13 to be concentric. Due to the setting of the through hole 131, the top of the middle support column 12 cannot be directly connected to the center of the cover plate 13. In this way, the cover plate 13 is only supported by the positioning column 14 and has poor stability. For this reason, a lifting portion 121 is provided on the middle support column 12, and the middle portion of the lifting portion 121 is fixedly connected to the middle support column 12. A plurality of connecting arms 122 are formed on the lifting portion 121 extending from the middle along the radial direction. Each connecting arm 122 is radially distributed relative to the middle portion of the lifting portion 121, and one end of each connecting arm 122 away from the middle portion of the lifting portion 121 can be detachably connected to the cover plate 13, so that each connecting arm 122 can provide support and limitation between the middle support column 12, the cover plate 13 and the bottom plate 11, so that the cover plate 13 is connected to the middle support column 12 and can rotate therewith. Specifically, a boss 123 is convexly provided upwardly on one end of each connecting arm 122 away from the middle of the lifting portion 121, and a through slot is concavely provided on the cover plate 13 for inserting the boss 123 therein, so as to facilitate the installation and removal of the cover plate 13 and the intermediate support column 12. A bearing 23 is fixedly installed at the middle position of the lifting portion 121, and the first gear 31 is fixedly connected to the inner ring of the bearing 23 and rotates relative to the intermediate support column 12 and the lifting portion 121. In this way, the locking portion 33 can directly cooperate with the first gear 31 through the through hole 131.In the content defined in this embodiment, the locking part 33 has a pressing block 331 for connecting with the machine cylinder. The pressing block 331 is a sheet-like structure, and has a connecting hole in the middle of the pressing block 331, and has a screw hole on the pressing block 331, so that the pressing block 331 is connected to the machine cylinder, and the pressing block 331 is driven by the machine cylinder to move in the vertical direction relative to the first gear 31. The bottom of the pressing block 331 has a locking end that can pass through the through hole 131 and lock the first gear 31. The locking end may include an arc-shaped downward pressing arc block 332 formed by bending and extending around the axis of the first gear 31. The downward pressing arc block 332 is formed by protruding downward from the pressing block 331 and is preferably provided in at least two. Each downward pressing arc block 332 is distributed in a ring array around the center of the first gear 31. On the first gear 31, a positioning slot 311 is provided at the position corresponding to each downward pressing arc block 332, which penetrates in the axial direction. When the pressing block 331 is driven by the machine cylinder to move toward the first gear 31 to approach the first gear 31, each downward pressing arc block 332 is inserted into the corresponding positioning slot 311, so that the pressing block 331 is used to lock the first gear 31 and prevent the first gear 31 from rotating. In order to prevent the machine cylinder from driving the pressing block 331 to over-press and affect the cooperation with the middle support column 12, the width of the pressing block 331 is larger than the connection hole and cannot pass through the connection hole, and the cover plate 13 itself can be used to limit the moving distance of the pressing block 331.

[0033] In another embodiment, the tube shell rotary grinding and polishing jig also includes a support structure 1, a clamping part 2 and a rotating unit 3. The support structure 1 includes a bottom plate 11, two connecting rods and a top plate. The bottom plate 11 and the top plate are strip-shaped structures and are arranged parallel to each other. The two connecting rods are respectively arranged at the bottom plate 11 and the two ends of the bottom plate 11, and one end of the two connecting rods is fixedly connected to the bottom plate 11, and the other ends of the two connecting rods can be detachably connected to the top plate for disassembly. The clamping parts 2 are arranged in multiple numbers and are spaced apart between the bottom plate 11 and the top plate along the length direction of the bottom plate 11, and the two ends of each clamping part 2 are rotatably connected to the bottom plate 11 and the top plate. The structure of the clamping part 2 is consistent with the above-mentioned embodiment and will not be repeated here. The rotating unit 3 includes a connecting shaft coaxially fixedly connected to one of the clamping parts 2, a transmission wheel fixedly mounted on each clamping part 2, and a transmission belt transmitted and wound around each transmission wheel. The connecting shaft is located above the top plate and coaxially fixedly connected to the external rotating shaft, so that when the rotating shaft rotates, it can drive each clamping part 2 to rotate synchronously and drive the tube shell to rotate. In order to ensure that each tube shell can be polished, the grinding wheel can be located on the side of each clamping part 2 and can move back and forth along the length direction of the bottom plate 11, so that multiple tube shells can be installed at the same time and multiple tube shells can be polished without replacing the grinding wheel consumables.

[0034] The working method of one embodiment of the tube shell rotating grinding and polishing jig of the utility model is as follows: first, remove the cover plate 13 upward along the axial direction to make the rod portion 222 of the upper limit portion 22 disengage from the key groove 212 and the protruding column 123 of the connecting arm 122 disengage from the through groove, then put the tube shell to be polished on each sleeve rod 21, then make the rod portion 222 key connected in the key groove 212 and the protruding column 123 inserted in the through groove to complete the assembly of the cover plate 13, and move the pressing block 331 downward by the machine cylinder until the arc is pressed down. After the block 332 is inserted into the positioning groove 311 and locks the first gear 31, polishing wax is brushed on the periphery of the product to increase the polishing and grinding force. Then the base plate 11 is installed on the rotating shaft of the machine so that the annular installation space contacts the grinding wheel (polishing soft cloth wheel). The rotating shaft rotates slowly, and the grinding wheel rotates quickly to polish each tube shell in turn until a round of polishing is completed. After the machine cylinder is lifted to drive the pressing block 331 away from the first gear 31, the cover plate 13 is removed and the tube shell is disassembled, and the polishing process is completed.

Claims

1. A tube shell rotary grinding and polishing fixture, characterized in that: include: A supporting structure, used to be mounted on the rotating shaft and driven by the rotating shaft to rotate around the axis; A clamping part, used for installing and positioning the tube shell, wherein the clamping parts are provided in plurality and are distributed at intervals around the outer periphery of the supporting structure; and The rotating unit is used to drive each of the clamping parts to rotate around its own axis.

2. The tube housing rotary grinding and polishing jig according to claim 1, characterized in that: The support structure includes a base plate for installation on a rotating shaft, an intermediate support column installed on the base plate along an axial direction, and a cover plate connected to the intermediate support column. An annular installation space is formed between the base plate, the intermediate support column and the cover plate. The two ends of each clamping part are respectively rotatably connected to the base plate and the cover plate and are distributed in an annular array around the intermediate support column.

3. The tube housing rotary grinding and polishing jig according to claim 2, characterized in that: Each of the clamping parts includes a sleeve rod with one end rotatably connected to the bottom plate to rotate around the axis and used to pass through the tube shell. The sleeve rod has a lower limit portion for supporting the tube shell on one end close to the bottom plate, and the other end of the sleeve rod is arranged toward the cover plate.

4. The tube housing rotary grinding and polishing jig according to claim 3, characterized in that: Each of the clamping parts also includes an upper limit portion rotatably connected to the cover plate to rotate around the axis, and the upper limit portion is detachably connected to an end of the sleeve rod close to the cover plate along the axial direction.

5. The tube housing rotary grinding and polishing jig according to claim 4, characterized in that: The upper limit portion comprises a head portion rotatably connected to the cover plate and a rod portion fixedly connected to the head portion and connected to a sleeve rod key, wherein the sleeve rod has a keyway for the rod portion to be keyed therein.

6. The tube housing rotary grinding and polishing jig according to claim 4, characterized in that: The rotating unit is defined as a transmission unit that synchronously transmits the rotation of each of the clamping parts as the supporting structure rotates; The transmission unit comprises a first gear coaxially and rotatably connected to the middle support column and a plurality of second gears rotatably connected to the cover plate and coaxially connected to each upper limit portion, each of the second gears meshing with the first gear; The transmission unit further includes a locking portion for locking the first gear when the support structure rotates, so that the support structure rotates relative to the first gear and each of the second gears rotates in the same direction as the support structure around the first gear.

7. The tube housing rotary grinding and polishing jig according to claim 6, characterized in that: A through hole is axially formed on the cover plate and faces the first gear. The locking portion has a locking end that can pass through the through hole and lock the first gear.

8. The tube housing rotary grinding and polishing jig according to claim 7, characterized in that: The locking end comprises a downward pressing arc block bent around the axis of the first gear, and a positioning groove is axially provided on the first gear for the downward pressing arc block to pass through and limit the rotation of the downward pressing arc block.

9. The tube housing rotary grinding and polishing jig according to claim 6, characterized in that: The intermediate support column is provided with a lifting portion, and the lifting portion is extended in a radial direction to form a plurality of connecting arms, each of the connecting arms is detachably connected to the cover plate, and the first gear is rotatably connected to the lifting portion.

10. The tube housing rotary grinding and polishing jig according to claim 2, characterized in that: The support structure also includes positioning columns with two ends respectively inserted into the bottom plate and the cover plate along the axial direction.

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