Support and protection device for pipes during lathe end-face chamfering.

Abstract

This utility model belongs to the field of pipe processing technology, and particularly relates to a support and protection device for pipes undergoing chamfering and beveling on a lathe. It includes a support tube, an inner bushing, and a threaded fastening sleeve. The inner bushing is made of a flexible material. The support tube has a hollow structure, allowing the inner bushing to be housed inside. The threaded fastening sleeve is threaded to both ends of the support tube to restrict axial movement of the inner bushing within the tube. Both the inner bushing and the threaded fastening sleeve have internal holes for the pipe to pass through. In use, the support tube is fixedly connected to the lathe spindle. The flexible inner bushing inside the support tube effectively reduces vibration and impact during processing, creating a stable environment for pipe processing and reducing bending deformation, scratches, etc., thereby lowering the defect rate or scrap rate. The threaded fastening sleeve limits the inner bushing, preventing axial movement and further improving the reliability of the device.

Description

Technical Field

[0001] This utility model belongs to the field of pipe processing technology, and in particular relates to a support and protection device for pipes being chamfered on a lathe. Background Technology

[0002] In the machining process, end-face finishing and chamfering of pipes are fundamental and crucial operations. Titanium alloy pipes, with their high strength, low density, and excellent corrosion resistance, are widely used in high-end fields such as aerospace, chemical, and medical industries.

[0003] However, slender titanium alloy tubes inherently suffer from insufficient rigidity, making them highly susceptible to bending deformation, vibration, and scratches during end-face chamfering. The negative impacts of these problems are significant. They not only severely interfere with machining accuracy, causing dimensional deviations and making it difficult to meet high-precision requirements, but also drastically reduce surface quality, potentially resulting in scratches, pits, and other defects. These issues significantly increase scrap rates, thereby substantially raising production costs and severely limiting the widespread application of these tubes in high-precision machining. Utility Model Content

[0004] To overcome the technical problems of bending deformation, vibration and scratches that easily occur when performing flat-end chamfering turning operations on existing pipes, this utility model provides a support and protection device for pipes in flat-end chamfering processing on a lathe.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A support and protection device for pipes used in lathe end-cutting and chamfering processes includes a support tube, an inner bushing, and a threaded fastening sleeve. The inner bushing is made of a flexible material. The support tube is hollow, allowing the inner bushing to be placed inside. The threaded fastening sleeve is threaded to both ends of the support tube to restrict axial movement of the inner bushing within the support tube. Both the inner bushing and the threaded fastening sleeve have internal holes for the pipe to pass through. In use, the support tube is fixedly connected to the lathe spindle.

[0007] In this application, a flexible inner liner is installed inside the support tube, which can effectively reduce vibration and impact during processing, create a stable environment for pipe processing, and reduce bending deformation, scratches and other issues during pipe processing, thereby reducing the defect rate or scrap rate; the threaded fastening sleeve limits the inner liner to prevent axial movement of the inner liner, further improving the reliability of the device.

[0008] In some embodiments, a fixing component is further included, which is connected to the support tube by a threaded pair, and the fixing component can be fixed on the lathe spindle so that the fixing component can be used to adjust the axial position of the support tube.

[0009] In some embodiments, the fixing component includes an outer tapered sleeve for connecting the support tube and the tapered hole at the right end of the lathe spindle. The outer tapered sleeve is adapted to the size of the tapered hole at the right end of the lathe spindle. The outer tapered sleeve has an internal thread, and the support tube has an external thread.

[0010] In some embodiments, the device further includes an external threaded tapered sleeve for connecting the support tube and the tapered hole at the left end of the lathe spindle. The external tapered sleeve has an external cone that matches the size of the tapered hole at the left end of the lathe spindle, and the inner diameter of the external threaded tapered sleeve matches the outer diameter of the support tube.

[0011] In some embodiments, a positioning threaded sleeve is further included. The positioning threaded sleeve is disposed on the side of the external threaded tapered sleeve away from the external tapered sleeve and is sleeved on the outside of the support tube to abut against and limit the external threaded tapered sleeve. The positioning threaded sleeve has multiple threaded holes in its circumferential direction for the internal hexagonal bolts to pass through and to fix the positioning threaded sleeve at the corresponding position of the support tube.

[0012] In some embodiments, a spacer sleeve is also included, which is sleeved outside the support tube. The spacer sleeve is disposed between the positioning threaded sleeve and the external threaded tapered sleeve to form a distance between the positioning threaded sleeve and the external threaded tapered sleeve, so as to avoid interference between the positioning threaded sleeve and the lathe spindle box.

[0013] In some embodiments, a fastening back cap is also fitted on the positioning threaded sleeve, the fastening back cap and the positioning threaded sleeve are threadedly connected, and the fastening back cap abuts against the spacer sleeve.

[0014] In some embodiments, a retraction cone cap is also included, wherein the external threaded cone sleeve is provided with an external thread, and the retraction cone cap is provided with a corresponding internal thread, so that the external threaded cone sleeve can be smoothly retracted when the retraction cone cap rotates.

[0015] In some embodiments, the inner liner is configured as multiple segments along the axial direction, and in practice, these multiple segments are sequentially arranged inside the support tube.

[0016] In some embodiments, a nylon slotted bushing is also included, which is positioned between the tube and the lathe's three-jaw centering chuck when in use.

[0017] The beneficial effects of this utility model are:

[0018] The support tube is fitted with an inner liner made of flexible material, which can effectively reduce vibration and impact during processing, create a stable environment for pipe processing, and reduce bending deformation, scratches and other issues during pipe processing, thereby reducing the defect rate or scrap rate. The threaded fastening sleeve limits the inner liner and prevents axial movement of the inner liner, further improving the reliability of the device. Attached Figure Description

[0019] Figure 1 A schematic diagram illustrating the application scenario of the support and protection device for pipes undergoing flat-end chamfering on a lathe, as provided by this utility model, when implemented on a CA6150A lathe;

[0020] Figure 2 for Figure 1 A partially enlarged schematic diagram of the left end of the support and protection device used for chamfering pipes on a lathe;

[0021] Figure 3 for Figure 1 A partially enlarged schematic diagram of the support and protection device used for chamfering pipe ends on a lathe;

[0022] Figure 4 for Figure 1 A partially enlarged schematic diagram of the right end of the support and protection device used for chamfering pipes on a lathe.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Support tube; 2. External tapered sleeve; 3. External threaded tapered sleeve; 4. Retracting tapered cap; 5. Positioning threaded sleeve; 6. Fastening cap; 7. Spacer sleeve; 8. Threaded fastening sleeve; 9. Nylon slotted bushing; 10. First protective bushing; 11. Second protective bushing; 12. Third protective bushing; 13. Tube; 14. Three-jaw centering chuck; 15. Lathe spindle; 16. Spindle box; 17. Socket headstock bolt. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0027] like Figures 1-4 As shown, this utility model provides a support and protection device for pipes undergoing flattening and chamfering on a lathe.

[0028] like Figure 1As shown, the application status of the support and protection device for the flat-end chamfering of the tube on the lathe in this embodiment is disclosed when it is implemented on the CA6150A lathe.

[0029] Specifically, the support and protection device for the flat-end chamfering of the pipe on the lathe includes a support tube 1, an inner bushing, and a threaded fastening sleeve 8. The inner bushing is made of a flexible material. The support tube 1 has a hollow structure for the inner bushing to be placed inside the support tube 1. The threaded fastening sleeve 8 is threaded to both ends of the support tube 1 to restrict the axial movement of the inner bushing inside the support tube 1. Both the inner bushing and the threaded fastening sleeve 8 have inner holes for the pipe 13 to pass through.

[0030] The support tube 1 here should be a rigid structure, bearing the entire device component and providing a stable foundation for other components. In this embodiment, the support tube 1 is made of 42GrMo cold-drawn seamless steel pipe, processed after tempering heat treatment, and is the main structure of the device. Its function is to fix and support the entire device, ensuring the stability of the device during turning.

[0031] The inner liner, as an elastic buffer element, is installed inside the support tube 1, which can effectively reduce the vibration and impact generated during processing and create a stable environment for the processing of the tube 13.

[0032] In this embodiment, the inner bushing includes a first protective bushing 10, a second protective bushing 11, and a third protective bushing 12, which are sequentially installed in the inner hole of the support tube 1, forming a clearance fit with the inner hole of the support tube 1 with a single-sided gap of 0.5mm, so as to facilitate the disassembly and replacement of bushings of different specifications as needed. The inner bushing can be made of flexible materials such as rubber or polyurethane, which are soft and elastic, and can effectively prevent the slender tube 13 from rubbing against the inner wall of the support tube 1 during installation and processing, and prevent scratches on the outer diameter surface of the tube 13, thereby reducing the defect rate or scrap rate.

[0033] The inner bushing adopts a multi-segment design, primarily because materials such as rubber and polyurethane are soft and highly elastic, and are prone to deformation during clamping and cutting precision when processed over long lengths. Furthermore, the multi-segment structure facilitates procurement, transportation, and storage, reducing logistical losses; it also facilitates installation, allows for partial replacement of worn sections during maintenance, reducing costs; and the segmented design also disperses stress, accommodates different material requirements, and improves overall performance.

[0034] In use, the support tube 1 is fixedly connected to the lathe spindle 15, the tube 13 passes through the support tube 1, and one end is held by the lathe's three-jaw centering chuck 14.

[0035] In this embodiment, the threaded fastening sleeve 8 is made of nylon and is installed at both ends of the support tube 1 to form a threaded fit.

[0036] In this application, the support tube 1 is provided with an inner liner made of flexible material, which can effectively reduce the vibration and impact generated during processing, create a stable environment for the processing of the tube 13, reduce bending deformation, scratches and other issues during the processing of the tube 13, thereby reducing the defect rate or scrap rate; the threaded fastening sleeve 8 limits the inner liner and prevents the inner liner from moving axially, further improving the reliability of the device.

[0037] In this embodiment, a fixing component is also included. The fixing component and the support tube 1 are connected by a threaded pair, and the fixing component can be fixed in the inner hole of the lathe spindle 15, so that the fixing component can be used to adjust the axial position of the support tube 1 and realize the precise positioning of the device on the lathe spindle 15.

[0038] In this embodiment, the fixing component includes an outer tapered sleeve 2, which is used to connect the support tube 1 and the tapered hole at the right end of the lathe spindle 15. The outer cone of the outer tapered sleeve 2 is adapted to the size of the tapered hole at the right end of the lathe spindle 15. The outer tapered sleeve 2 is provided with an internal thread, and the support tube 1 is provided with an external thread.

[0039] Specifically, the outer taper sleeve 2 here is a Morse taper 6# outer taper sleeve, corresponding to the aforementioned machine tool model. The internal thread is tightly fitted with the external thread on the right end of the support tube 1, used to precisely adjust the axial relative position of the support protection device and the lathe spindle 15; the outer cone forms a taper fit with the Morse taper 6# taper hole on the right end of the lathe spindle 15, ensuring the coaxiality of the support tube 1 and the lathe spindle 15, effectively preventing the support protection device from moving along the X and Y axes and axial movement in the Z axis during turning, thereby ensuring the accuracy and stability of machining.

[0040] In this embodiment, an external threaded tapered sleeve 3 is also included. The external threaded tapered sleeve 3 is used to connect the support tube 1 and the tapered hole at the left end of the lathe spindle 15. The outer cone of the external threaded tapered sleeve 3 is adapted to the size of the tapered hole at the left end of the lathe spindle 15, and the inner hole of the external threaded tapered sleeve 3 is adapted to the outer diameter of the support tube 1.

[0041] Specifically, the external thread tapered sleeve 3 here is a 1:20 external thread tapered sleeve. The inner hole of the 1:20 external thread tapered sleeve is H8 / e7 fitted with the outer diameter of the left end of the support tube 1. The outer cone is taper fitted with the Φ52 (1:20) tapered hole at the left end of the lathe spindle 15, which restricts the rotation of the support protection device along the X and Z axes, and together with the Morse 6# external tapered sleeve, ensures the coaxiality of the device with the lathe spindle 15.

[0042] In this embodiment, a positioning threaded sleeve 5 is also included. The positioning threaded sleeve 5 is disposed on the side of the external threaded tapered sleeve 3 away from the external tapered sleeve 2 and is sleeved on the outside of the support tube 1 to abut against and limit the external threaded tapered sleeve 3. The positioning threaded sleeve 5 has multiple threaded holes in the circumferential direction for the internal hexagon bolts 17 to pass through, and fixes the positioning threaded sleeve 5 at the corresponding position of the support tube 1.

[0043] Specifically, the inner hole of the positioning threaded sleeve 5 and the outer diameter of the left end of the support tube 1 form an H8 / e7 clearance fit. By tightening the three M10 socket head cap bolts evenly distributed on the circumference of the positioning threaded sleeve 5, the positioning threaded sleeve 5 can be fixed in the corresponding position of the support tube 1.

[0044] Furthermore, it also includes a spacer sleeve 7 sleeved outside the support tube 1. The spacer sleeve 7 is positioned between the positioning threaded sleeve 5 and the external threaded tapered sleeve 3 to form a distance between the positioning threaded sleeve 5 and the external threaded tapered sleeve 3, so as to avoid interference between the positioning threaded sleeve 5 and the lathe spindle box 16.

[0045] Specifically, the spacer sleeve 7 and the support tube 1 are fitted with an outer diameter of H8 / e7 to precisely limit the distance between the positioning threaded sleeve 5 and the left end of the lathe spindle 15, so as to prevent the positioning threaded sleeve 5 from contacting the gearbox protective cover of the spindle box 16 and prevent accidents from occurring.

[0046] In this embodiment, a fastening cap 6 is also fitted onto the positioning threaded sleeve 5. The fastening cap 6 and the positioning threaded sleeve 5 are threadedly connected, and the fastening cap 6 abuts against the spacer sleeve 7. Rotating the fastening cap 6 clockwise can push the spacer sleeve 7 and the external threaded tapered sleeve 3 to move along the positive Z-axis, thereby fixing the entire device and restricting the movement of the device in the Z-axis direction.

[0047] In this embodiment, a tapered sleeve 4 is also included. The external threaded tapered sleeve 3 is provided with an external thread, and the tapered sleeve 4 is provided with an internal thread, so that the external tapered sleeve can be smoothly withdrawn when the tapered sleeve 4 rotates.

[0048] Specifically, rotating the adjusting tapered back cap 4 clockwise allows the external threaded tapered sleeve 3 to smoothly exit the Φ52 (1:20) tapered hole along the -Z axis direction, facilitating the disassembly of the device.

[0049] In this embodiment, a nylon slotted bushing 9 is also included, which is located between the tube 13 and the three-jaw centering chuck 14 of the lathe when in use.

[0050] Specifically, the nylon slotted bushing 9 is made of nylon, a relatively soft material. It is clamped onto the three-jaw centering chuck 14 on the right end of the lathe spindle box 16, forming a clearance fit with the tube 13. When clamped, the inner and outer diameters of the slotted bushing contract, effectively clamping the outer cylindrical surface of the tube 13. This prevents tube wall deformation and clamping marks, avoiding the scrapping of the tube 13 and further ensuring processing quality.

[0051] The specific installation and usage process is as follows.

[0052] 1. Preparation

[0053] Carefully inspect all components, including support tube 1, Morse taper 6 external tapered sleeve, and 1:20 external thread tapered sleeve, to ensure they are free from damage and impurities. Also, prepare the necessary installation tools, such as an Allen wrench.

[0054] 2. Install the threaded fastening sleeve 8 and the inner bushing.

[0055] Install a threaded fastening sleeve 8 on the right end of the support tube 1 and tighten it to form a stable threaded connection with the support tube 1.

[0056] The first protective bushing 10, the second protective bushing 11 and the third protective bushing 12 are sequentially installed into the inner hole of the support tube 1 to ensure that the gap on one side is 0.5mm.

[0057] Install and tighten the threaded fastening sleeve 8 at the left end of the support tube 1 to achieve axial positioning of the protective bushing.

[0058] 3. Install support tube 1 and Morse code 6 outer cone sleeve.

[0059] First, insert the support tube 1 into the spindle hole.

[0060] Engage the internal thread of the Morse taper sleeve 6# with the external thread on the right end of the support tube 1 to initially adjust the axial position.

[0061] The outer cone of the Morse 6# outer tapered sleeve is precisely aligned with the Morse 6# tapered hole on the right end of the lathe spindle 15 to ensure a tight fit. This makes the support tube 1 initially axially coaxial with the lathe spindle 15, effectively preventing displacement of the device in the X and Y axes and axial movement in the Z axis.

[0062] 4. Install the 1:20 external thread tapered sleeve and the retractable tapered cap.

[0063] According to the H8 / e7 standard, the inner hole of the 1:20 external thread tapered sleeve is fitted with the outer diameter of the left end of the support tube 1 so that its outer cone is fitted with the tapered hole of the left end of the lathe spindle 15 at the Φ52 (1:20) taper.

[0064] Install the tapered back cap 4 to mate with the 1:20 external thread tapered sleeve for subsequent disassembly.

[0065] 5. Install the spacer sleeve 7

[0066] The spacer sleeve 7 is fitted into the left end of the support tube 1 according to the H8 / e7 configuration, thereby limiting the distance between the positioning threaded sleeve 5 and the left end of the lathe spindle 15, preventing the positioning threaded sleeve 5 from contacting the protective cover of the gearbox of the spindle box 16, and ensuring the safe operation of the device.

[0067] 6. Install the positioning threaded sleeve 5 and the fastening back cap 6.

[0068] First, screw the fastening cap 6 into the positioning threaded sleeve 5, then install the positioning threaded sleeve 5 into the left end of the support tube 1 and press it against the spacer sleeve 7.

[0069] Tighten the three M10 socket head cap bolts evenly distributed on the positioning threaded sleeve 5 clockwise with an Allen wrench to fix it in the corresponding position on the support tube 1.

[0070] By rotating the fastening cap 6 clockwise, the spacer sleeve 7 and the 1:20 external thread tapered sleeve are pushed to move along the positive Z-axis, restricting movement in the Z-axis direction and further stabilizing the device.

[0071] 7. Inspection and debugging

[0072] A thorough inspection was conducted to ensure that all components were installed correctly and connected securely, and that the taper holes at both ends of the machine tool spindle were in close contact with the Morse taper sleeve #6 and the 1:20 external thread taper sleeve.

[0073] Conduct a simple trial run to observe the stability of the device and the fit of the components. Check that the coaxiality between the outer diameter Φ50 of the left end support tube 1 of the spindle and the spindle is less than 0.1mm to prevent the device from bending due to centrifugal force during machining, which could lead to a safety accident.

[0074] 8. Install titanium tubing

[0075] Insert the Φ14mm×2×2250mm titanium tube into the Φ15 inner hole of the inner bushing from the left end of the device, so that the right end extends into the chuck.

[0076] 9. Install nylon slotted bushings.

[0077] Install the nylon slotted bushing 9 on the outer diameter of the titanium tube, push in the right end three-jaw centering chuck 14, so that the left end of its step is in close contact with the end face of the three jaws, and adjust the titanium tube to the appropriate processing position.

[0078] Then rotate the three-jaw chuck clockwise to clamp the nylon slotted bushing 9, thereby reliably clamping the titanium tube.

[0079] 10. Overall Inspection and Testing

[0080] Double-check the installation and connection of each component.

[0081] Select a low speed of 100-120 rpm for trial operation, observe the stability of the device, and check the coaxiality of the outer circle Φ50 of the left end support tube 1 of the lathe spindle 15 with the lathe spindle 15.

[0082] Then gradually increase the speed to 800 rpm - 1000 rpm. If it runs normally, the entire installation process is complete.

[0083] The support and protection device for pipes undergoing flat-end chamfering on a lathe, as disclosed in this embodiment, has at least the following advantages.

[0084] Significantly Improved Machining Stability and Precision: This invention achieves high-precision positioning and stable installation of the device on the lathe spindle 15, greatly reducing vibration and displacement caused by device shaking during turning. The inner bushing further absorbs and buffers machining vibration and impact, creating a stable machining environment for the slender titanium alloy tube 13. Actual tests show that when machining the slender titanium alloy tube 13 using this device, the vibration frequency of the tube 13 is reduced to 10Hz-20Hz, the machining accuracy error is reduced by more than 60% compared to traditional devices, the length is precisely controlled within ±0.2mm, and the surface roughness is significantly reduced from Ra6.3μm to Ra1.6μm, effectively improving the product machining quality.

[0085] The scrap rate has been significantly reduced: the application of the inner liner and the nylon slotted bushing 9 fundamentally solves the problem of easy scratching and deformation during the processing of the pipe 13. In the applicant's production practice, after using this device, the scrap rate of the slender titanium alloy pipe 13 has been reduced from the original 25% to below 5%, significantly improving the product qualification rate, reducing production costs, and bringing considerable economic benefits to the enterprise.

[0086] Enhanced adaptability: The inner liner and nylon slotted bushing are adjustable, allowing the device to flexibly adapt to the processing of slender titanium alloy pipes 13 with diameters ranging from 4mm to 20mm and lengths from 1000mm to 2500mm. Testing shows that replacing different specifications of accessories and completing debugging takes an average of only 5 minutes, greatly improving the equipment's versatility and practicality, and reducing the cost for companies to frequently change equipment when processing different specifications of pipes 13.

[0087] Easy Installation and Maintenance: The device's design, including the retractable cone back cap 4, makes installation and disassembly simple and quick. Workers can complete the installation and disassembly without the need for complex tools and equipment, effectively shortening equipment commissioning and maintenance time, improving production efficiency, and reducing labor intensity. Furthermore, the standardized design of each component facilitates replacement and repair, further reducing equipment maintenance costs.

[0088] Reduced Equipment Procurement Investment: This utility model adopts a modular and standardized design, possessing high compatibility and significantly reducing enterprise equipment procurement investment. Its core components have a high degree of standardization, meeting the processing needs of various specifications of slender titanium alloy tubes 13. Enterprises do not need to purchase dedicated processing equipment for different specifications of products; diversified production can be achieved simply by quickly changing parts, greatly reducing the number of equipment purchases and lowering capital occupation. Simultaneously, the device structure balances durability and ease of maintenance; standardized components have a long service life, reducing procurement costs caused by frequent replacements due to equipment wear and tear, effectively saving enterprises significant equipment purchase funds, optimizing resource allocation, and improving capital utilization efficiency.

[0089] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A supporting and protecting device for pipe head chamfering in a lathe, characterized in that, It includes a support tube (1), an inner liner and a threaded fastening sleeve (8), the inner liner being made of a flexible material; The support tube (1) is a hollow structure, which allows the inner liner to be placed inside the support tube (1). The threaded fastening sleeve (8) is threaded to both ends of the support tube (1) to restrict the axial movement of the inner liner inside the support tube (1). Both the inner bushing and the threaded fastening sleeve (8) have inner holes for the pipe (13) to pass through; When in use, the support tube (1) is fixedly connected to the lathe spindle (15).

2. The support protection device for pipe head chamfering in a lathe according to claim 1, wherein It also includes a fixing component, which is connected to the support tube (1) by a threaded pair, and the fixing component can be fixed on the lathe spindle (15) so that the fixing component can be used to adjust the axial position of the support tube (1).

3. The support protection device for pipe head chamfering in a lathe according to claim 2, wherein The fixing assembly includes an outer tapered sleeve (2), which is used to connect the support tube (1) and the tapered hole at the right end of the lathe spindle (15). The outer cone of the outer tapered sleeve (2) is adapted to the size of the tapered hole at the right end of the lathe spindle (15). The outer tapered sleeve (2) has an internal thread, and the support tube (1) has an external thread.

4. The support protection device for pipe head chamfering in a lathe according to claim 3, wherein It also includes an external threaded tapered sleeve (3), which is used to connect the support tube (1) and the tapered hole at the left end of the lathe spindle (15). The external tapered sleeve (3) and the tapered hole at the left end of the lathe spindle (15) are matched in size. The inner hole of the external threaded tapered sleeve (3) is matched in size with the outer diameter of the support tube (1).

5. The support protection device for pipe head chamfering in a lathe according to claim 4, wherein It also includes a positioning threaded sleeve (5), which is located on the side of the external threaded tapered sleeve (3) away from the external tapered sleeve (2) and is sleeved on the outside of the support tube (1) to abut against the limiting external threaded tapered sleeve (3). The positioning threaded sleeve (5) has multiple threaded holes on its circumference for the internal hex bolt (17) to pass through, and the positioning threaded sleeve (5) is fixed at the corresponding position of the support tube (1).

6. The support protection device for pipe head chamfering in a lathe according to claim 5, wherein It also includes a spacer sleeve (7) fitted outside the support tube (1). The spacer sleeve (7) is set between the positioning threaded sleeve (5) and the external threaded tapered sleeve (3) to form a distance between the positioning threaded sleeve (5) and the external threaded tapered sleeve (3) to avoid interference between the positioning threaded sleeve (5) and the lathe spindle box (16).

7. The support protection device for pipe head chamfering in a lathe according to claim 6, wherein The positioning threaded sleeve (5) is also fitted with a fastening back cap (6), which is threadedly connected to the positioning threaded sleeve (5), and the fastening back cap (6) abuts against the spacer sleeve (7).

8. The support protection device for pipe head chamfering in a lathe according to claim 4, wherein It also includes a tapered back cap (4), an external thread on the external threaded tapered sleeve (3), and an internal thread on the tapered back cap (4), so that the external threaded sleeve can be smoothly withdrawn when the tapered back cap (4) rotates.

9. The support protection device for pipe head chamfering in a lathe according to claim 1, wherein The inner liner is divided into multiple sections along the axial direction, and in practice, the multiple sections are sequentially arranged inside the support tube (1).

10. The support and protection device for pipe end chamfering on a lathe as described in any one of claims 1-9, characterized in that, It also includes a nylon slotted bushing (9), which is positioned between the tube (13) and the lathe's three-jaw centering chuck (14) during use.

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