A telescopic variable diameter bracket assembly and its application

Abstract

The present invention discloses a telescopic variable diameter bracket assembly and its application, comprising an upper hinge seat, a lower hinge seat, a support rod, and a hinge seat spacing adjuster connected between the upper hinge seat and the lower hinge seat for changing the distance between the upper hinge seat and the lower hinge seat. The support rod comprises N upper support rods arranged circumferentially on the upper hinge seat and N lower support rods arranged circumferentially on the lower hinge seat, and one end of each of the N upper support rods is rotatably connected to the upper hinge seat via a first hinge shaft, one end of each of the N lower support rods is rotatably connected to the lower hinge seat via a first hinge shaft, and the other end of each of the N upper support rods is rotatably connected to the other end of each of the N lower support rods via a second hinge shaft. The present invention improves the versatility of special process equipment such as support and positioning tooling and specialized tooling, thereby reducing the cost of special process equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical process equipment, and in particular to a telescopic variable diameter bracket assembly and application thereof. Background Art

[0002] The machinery manufacturing industry involves the production of numerous rotating parts (such as cylinders, gears, flanges, etc.). To ensure the quality and efficiency of these parts, specialized tooling, such as support and positioning tooling and specialized tooling, is typically deployed during mass production. However, due to the wide variety of sizes of rotating parts, a significant amount of specialized tooling is often required to accommodate these varying specifications, increasing the cost of specialized process equipment. Summary of the Invention

[0003] To address the above issues, the present invention proposes a retractable, variable-diameter bracket assembly and its application, aiming to improve the versatility of specialized process equipment such as support and positioning tooling and specialized tooling, thereby reducing the cost of specialized process equipment. The specific technical solution is as follows:

[0004] The cam is connected to the lower hinge seat by a first hinge shaft, and the cam is connected to the lower hinge seat by a second hinge shaft, and the cam is connected to the lower hinge seat by a second hinge shaft.

[0005] As one of the preferred solutions of the hinge seat spacing adjuster in the present invention, the hinge seat spacing adjuster is a basket bolt; the basket bolt includes a ring part and an upper stud and a lower stud respectively integrally connected to the upper and lower ends of the ring part, the upper stud is threadedly connected to the center threaded hole on the upper hinge seat, and the lower stud is threadedly connected to the center threaded hole on the lower hinge seat.

[0006] As the second preferred solution of the hinge seat spacing adjuster in the present invention, the hinge seat spacing adjuster is a cylinder, the cylinder body of the cylinder is fixedly connected to the upper hinge seat, and the piston rod of the cylinder is fixedly connected to the lower hinge seat.

[0007] As the third preferred solution of the hinge seat spacing adjuster in the present invention, the hinge seat spacing adjuster is a servo electric push rod, the base of the servo electric push rod is fixedly connected to the upper hinge seat, and the telescopic rod of the servo electric push rod is fixedly connected to the lower hinge seat.

[0008] Preferably, a pressure sensor is provided on the telescopic rod of the servo electric push rod.

[0009] Preferably, the N upper support rods and the N lower support rods are respectively arranged at even intervals along the circumferential direction.

[0010] More preferably, the number N of the upper support rods and the number N of the lower support rods are 3 to 48 respectively, and the number of the upper support rods and the number of the lower support rods are the same.

[0011] As one of the application cases of the telescopic variable diameter bracket assembly in the present invention, the telescopic variable diameter bracket assembly is used for anti-deformation support during cylinder welding; when in use, the telescopic variable diameter bracket assembly is placed in the inner hole of the cylinder, and by operating the hinge seat spacing adjuster, the end of each support rod close to the second hinge shaft is supported against the inner hole wall of the cylinder.

[0012] As the second application case of the retractable variable diameter bracket assembly in the present invention, a pair of deburring rolling wheels are respectively installed at both ends of the second hinge shaft through bearings. The retractable variable diameter bracket assembly is used to deburr the keyway edge of the spline hole of the workpiece, and the hinge seat spacing adjuster adopts a cylinder; when in use, the retractable variable diameter bracket assembly is placed in the spline hole of the workpiece, and under the action of the cylinder, the pair of rolling wheels at both ends of the second hinge shaft correspondingly contact the keyway edges on both sides of the spline hole, and the retractable variable diameter bracket assembly is moved back and forth as a whole along the central axis of the spline hole, driving a pair of deburring rolling wheels to roll and deburr the keyway edge of the spline hole.

[0013] Preferably, a gantry, a lifting mechanism arranged on the top of the gantry, and a deburring workbench arranged at the middle bottom position of the gantry are also provided. The cylinder body of the cylinder is fixed on the lifting mechanism. When in use, the workpiece is positioned and fixed by a positioning tool arranged on the deburring workbench.

[0014] Preferably, the positioning tool on the deburring workbench is a chuck.

[0015] Preferably, a limit switch for controlling the up and down movement range of the telescopic variable diameter bracket assembly can also be provided on the gantry.

[0016] As the third application case of the retractable variable diameter bracket assembly in the present invention, the retractable variable diameter bracket assembly is used for dotting operations before drilling holes in large flange parts, the hinge seat spacing adjuster adopts a servo electric push rod, and the retractable variable diameter bracket assembly used for dotting operations is also provided with a pair of directional control rods between the upper support rod and the lower support rod, one end of the pair of directional control rods is respectively rotatably connected to the upper support rod and the lower support rod through a third hinge shaft, and the other ends of the pair of directional control rods are rotatably connected through a fourth hinge shaft; a horizontal cross bar is rotatably provided at one end of the second hinge shaft, a hole seat is provided on the fourth hinge shaft, a transverse through hole is provided on the hole seat, and the horizontal cross bar is slidably fitted in the transverse through hole; a dotting assembly is provided on the horizontal cross bar, and the dotting assembly includes an electric engraving pen provided on the horizontal cross bar with the pen tip facing downward.

[0017] Preferably, the electric engraving pen has a built-in lithium battery, and the tip of the electric engraving pen rotates at high speed after being powered on, thereby realizing the dotting operation.

[0018] Preferably, a gantry and a dotting workbench located at the middle bottom of the gantry are also provided, the base of the servo electric push rod is fixed on the lifting mechanism, and when in use, the large flange is positioned and fixed by a positioning tool provided on the dotting workbench; the dotting assembly also includes an automatic dotting opening and closing device provided on the horizontal crossbar, and the automatic dotting opening and closing device includes an engraving pen mounting seat fixed on the horizontal crossbar, a lifting collet arranged in the inner hole of the engraving pen mounting seat and moving in the up and down directions, and a lifting collet is provided between the lifting collet and the An anti-rotation key is provided between the inner holes of the engraving pen mounting seat, an upper retaining ring is provided on the outer circle of the upper end of the lifting cylinder clamp, and a lower retaining shoulder is provided on the outer circle of the lower end of the lifting cylinder clamp. A pressure spring for pressing the lifting cylinder clamp downward is provided between the lower end surface of the engraving pen mounting seat and the lower retaining shoulder of the lifting cylinder clamp. The electric engraving pen is fixed in the lifting cylinder clamp, and a self-resetting opening and closing button is provided on the top of the electric engraving pen. A button baffle for blocking the self-resetting opening and closing button is provided on the horizontal cross bar at an interval above the self-resetting opening and closing button.

[0019] An anti-rotation key is provided between the lifting collet and the inner hole of the engraving pen mounting seat, so that the lifting collet can only be lifted but not rotated.

[0020] Preferably, the lifting mechanism and the servo electric push rod are connected to a dot control system.

[0021] During the dotting operation, the pitch circle diameter of the dotting is adjusted by the servo electric push rod, the large flange is installed on the positioning tooling of the dotting workbench, and then the lifting mechanism is turned on to make the retractable variable diameter bracket assembly move downward as a whole. During the process of the retractable variable diameter bracket assembly moving downward as a whole, the electric engraving pen on the retractable variable diameter bracket group first contacts the plane of the large flange, and then the electric engraving pen overcomes the pressure of the top pressure spring and moves upward until the self-resetting opening and closing button on the top of the electric engraving pen contacts the button baffle and the self-resetting opening and closing button is pressed. The electric engraving pen is powered on to perform the dotting operation on the large flange. After dotting, the retractable variable diameter bracket assembly moves upward as a whole, the electric engraving pen resets downward, and the power is disconnected, and the dotting of the large flange is completed.

[0022] After the large flange is marked, it is moved to the drilling machine and the drilling operation is performed on the flange in equal parts based on the marked position.

[0023] The beneficial effects of the present invention are:

[0024] First, the telescopic variable diameter bracket assembly and its application of the present invention can realize the adjustable diameter of the telescopic variable diameter bracket assembly through the hinge seat spacing adjuster, and can be used in the support and positioning tooling and professional tooling of rotating parts of different specifications, thereby greatly reducing the cost of special process equipment.

[0025] Second, the present invention provides a telescopic variable diameter bracket assembly and its application. By arranging a pair of rolling wheels on the telescopic variable diameter bracket assembly, the keyway edges of the spline inner hole on the workpiece are deburred, and the burrs on the edges of all keyways on the spline inner hole can be removed at the same time, thereby greatly improving the efficiency of deburring the keyway edges on the spline inner hole.

[0026] Third, the present invention relates to a telescopic variable diameter bracket assembly and its application. By installing a dotting assembly on the telescopic variable diameter bracket assembly, it is possible to perform dotting of equally divided holes with different pitch diameters, thereby improving the accuracy of subsequent drilling. Furthermore, multiple dotting locations can be dotted simultaneously, resulting in highly efficient dotting operations. Furthermore, the pitch diameter of the dotted holes can be adjusted to suit flange specifications using a servo electric actuator, providing excellent versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a telescopic variable diameter bracket assembly of the present invention;

[0028] Figure 2 yes Figure 1 One of the partial enlarged views;

[0029] Figure 3 yes Figure 1 The second partial enlarged view;

[0030] Figure 4 This is one of the application cases of a telescopic variable diameter bracket assembly of the present invention (used for anti-deformation support during cylinder welding);

[0031] Figure 5 This is the second application case of the telescopic variable diameter bracket assembly of the present invention (used for deburring the keyway edge of the spline hole of a workpiece);

[0032] Figure 6 yes Figure 5 Schematic diagram of the deburring rolling wheel part (top view);

[0033] Figure 7 This is the third application case of a retractable variable diameter bracket assembly of the present invention (used for marking work before drilling holes in large flanges);

[0034] Figure 8 yes Figure 7 A partial enlarged view of .

[0035] In the figure: 1. Telescopic variable diameter bracket assembly, 2. Upper hinge seat, 3. Lower hinge seat, 4. Upper support rod, 5. Lower support rod, 6. First hinge shaft, 7. Second hinge shaft, 8. Turnbuckle bolt, 9. Ring member, 10. Upper stud, 11. Lower stud, 12. Cylinder, 13. Servo electric push rod, 14. Pressure sensor, 15. Cylinder, 16. Deburring roller, 17. Lifting mechanism, 18. Spline hole, 19. Keyway, 20. Gantry, 21. Deburring workbench, 2 2. Positioning fixture, 23. Piston rod, 24. Large flange, 25. Directional control lever, 26. Third hinge, 27. Fourth hinge, 28. Horizontal crossbar, 29. Dotting assembly, 30. Electric engraving pen, 31. Dotting workbench, 32. Engraving pen mounting seat, 33. Lifting collet, 34. Pressing spring, 35. Self-resetting opening and closing button, 36. Button baffle, 37. Upper retaining ring, 38. Lower shoulder, 39. Telescopic rod, 40. Hole seat, 41. Bearing, 42. Workpiece DETAILED DESCRIPTION

[0036] The following embodiments are further described in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0037] Example 1:

[0038] like Figures 1 to 8The figure shows an embodiment of a telescopic variable diameter bracket assembly of the present invention, comprising an upper hinge seat 2, a lower hinge seat 3, a support rod, and a hinge seat spacing adjuster connected between the upper hinge seat 2 and the lower hinge seat 3 for changing the distance between the upper hinge seat 2 and the lower hinge seat 3, the support rod comprising N upper support rods 4 arranged circumferentially at intervals on the upper hinge seat 2 and N lower support rods 5 arranged circumferentially at intervals on the lower hinge seat 3, and one end of the N upper support rods 4 is rotatably connected to the upper hinge seat 2 through a first hinge shaft 6, one end of the N lower support rods 5 is rotatably connected to the lower hinge seat 3 through a first hinge shaft 6, and the other end of the N upper support rods 4 is rotatably connected to the other end of the N lower support rods 5 through a second hinge shaft 7.

[0039] As one of the preferred solutions for the hinge seat spacing adjuster in this embodiment, the hinge seat spacing adjuster is a basket bolt 8; the basket bolt 8 includes a ring part 9 and an upper stud 10 and a lower stud 11 respectively integrally connected to the upper and lower ends of the ring part 9, the upper stud 10 is threadedly connected to the center threaded hole on the upper hinge seat 2, and the lower stud 11 is threadedly connected to the center threaded hole on the lower hinge seat 3.

[0040] As the second preferred solution of the hinge seat spacing adjuster in this embodiment, the hinge seat spacing adjuster is a cylinder 12, the cylinder body of the cylinder 12 is fixedly connected to the upper hinge seat 2, and the piston rod 23 of the cylinder 12 is fixedly connected to the lower hinge seat 3.

[0041] As the third preferred solution of the hinge seat spacing adjuster in this embodiment, the hinge seat spacing adjuster is a servo electric push rod 13, the base of the servo electric push rod 13 is fixedly connected to the upper hinge seat 2, and the telescopic rod 39 of the servo electric push rod 13 is fixedly connected to the lower hinge seat 3.

[0042] Preferably, a pressure sensor 14 is provided on the telescopic rod 39 of the servo electric push rod 13 .

[0043] Preferably, the N upper support rods 4 and the N lower support rods 5 are respectively arranged at even intervals along the circumferential direction.

[0044] More preferably, the number N of the upper support rods 4 and the number N of the lower support rods 5 are 3 to 48, and the number of the upper support rods 4 and the number of the lower support rods 5 are the same.

[0045] Example 2:

[0046] As one of the application cases of the telescopic variable diameter bracket assembly in this embodiment, the telescopic variable diameter bracket assembly 1 is used for anti-deformation support during welding of the cylinder 15; when in use, the telescopic variable diameter bracket assembly 1 is placed in the inner hole of the cylinder 15, and by operating the hinge seat spacing adjuster, the end of each support rod close to the second hinge shaft 7 is pressed against the inner hole wall of the cylinder 15.

[0047] Example 3:

[0048] As the second application case of the retractable variable diameter bracket assembly in this embodiment, a pair of deburring rolling wheels 16 are respectively installed at both ends of the second hinge shaft 7 through bearings 41. The retractable variable diameter bracket assembly 1 is used to deburr the edge of the keyway 19 of the spline hole 18 of the workpiece 42, and the hinge seat spacing adjuster adopts a cylinder 12; when in use, the retractable variable diameter bracket assembly 1 is placed in the spline hole 18 of the workpiece 42, and under the action of the cylinder 12, the pair of rolling wheels 16 at both ends of the second hinge shaft 7 correspondingly contact the edges on both sides of the keyway 19 of the spline hole 18, and the retractable variable diameter bracket assembly 1 moves back and forth as a whole along the central axis of the spline hole 18, driving a pair of deburring rolling wheels 16 to roll and deburr the edge of the keyway 19 of the spline hole 18.

[0049] Preferably, a gantry 20, a lifting mechanism 17 arranged on the top of the gantry 20, and a deburring workbench 21 arranged at the middle bottom position of the gantry 20 are also provided. The cylinder body of the cylinder 12 is fixed on the lifting mechanism 17. When in use, the workpiece 42 is positioned and fixed by the positioning tool 22 arranged on the deburring workbench 21.

[0050] Preferably, the positioning tool 22 on the deburring workbench 21 is a chuck.

[0051] Preferably, a limit switch (not shown in the figure) for controlling the up and down movement range of the telescopic variable diameter bracket assembly 1 can also be provided on the gantry 20 .

[0052] Example 4:

[0053] As the third application case of the retractable variable diameter bracket assembly in this embodiment, the retractable variable diameter bracket assembly 1 is used for the dotting operation before drilling a large flange part 24. The hinge seat spacing adjuster adopts a servo electric push rod 13, and the retractable variable diameter bracket assembly 1 used for the dotting operation is also provided with a pair of directional control rods 25 between the upper support rod 4 and the lower support rod 5. One end of the pair of directional control rods 25 is rotatably connected to the upper support rod 4 and the lower support rod 5 through a third hinge shaft 26, and the other ends of the pair of directional control rods 25 are rotatably connected through a fourth hinge shaft 27; a horizontal cross bar 28 is rotatably provided at one end of the second hinge shaft 7, and a hole seat 40 is provided on the fourth hinge shaft 27, and a transverse through hole is provided on the hole seat 40, and the horizontal cross bar 28 is slidably fitted in the transverse through hole; a dotting assembly 29 is provided on the horizontal cross bar 28, and the dotting assembly 29 includes an electric engraving pen 30 arranged on the horizontal cross bar 28 and with the pen tip facing downward.

[0054] Preferably, the electric engraving pen 30 has a built-in lithium battery. After being powered on, the pen tip of the electric engraving pen 30 rotates at a high speed, thereby achieving dotting operations.

[0055] Preferably, a gantry 20 and a dotting workbench 31 located at the middle bottom of the gantry 20 are also provided. The base of the servo electric push rod 13 is fixed on the lifting mechanism 17. When in use, the large flange 24 is positioned and fixed by a positioning tool 22 provided on the dotting workbench 31; the dotting assembly 29 also includes an automatic dotting opening and closing device provided on the horizontal cross bar 28, and the automatic dotting opening and closing device includes an engraving pen mounting seat 32 fixed on the horizontal cross bar 28, and a lifting collet 33 provided in the inner hole of the engraving pen mounting seat 32 and movable in the up and down directions. 2, an anti-rotation key (not shown in the figure) is provided between the inner holes, an upper retaining ring 37 is provided on the outer circle of the upper end of the lifting collet 33, and a lower retaining shoulder 38 is provided on the outer circle of the lower end of the lifting collet 33. A pressing spring 34 for pressing the lifting collet 33 downward is provided between the lower end surface of the engraving pen mounting seat 32 and the lower retaining shoulder 38 of the lifting collet 33. The electric engraving pen 30 is fixed in the lifting collet 33. A self-resetting opening and closing button 35 is provided on the top of the electric engraving pen 30. A button baffle 36 for blocking the self-resetting opening and closing button 35 is provided on the horizontal cross bar 28 at a distance above the self-resetting opening and closing button 35.

[0056] An anti-rotation key is provided between the lifting collet 33 and the inner hole of the engraving pen mounting seat 32 so that the lifting collet 33 can only be lifted but cannot be rotated.

[0057] Preferably, the lifting mechanism 17 and the servo electric push rod 13 are connected to a dotting control system.

[0058] During the dotting operation, the pitch circle diameter of the dotting is adjusted by the servo electric push rod 13, the large flange 24 is installed on the positioning tooling of the dotting workbench 31, and then the lifting mechanism 17 is turned on to make the retractable variable diameter bracket assembly 1 move downward as a whole. During the process of the retractable variable diameter bracket assembly 1 moving downward as a whole, the electric engraving pen 30 on the retractable variable diameter bracket assembly 1 first contacts the plane of the large flange 24, and then the electric engraving pen 30 overcomes the pressure of the top pressure spring 34 and moves upward until the self-resetting opening and closing button 35 on the top of the electric engraving pen 30 contacts the button baffle 36 and the self-resetting opening and closing button 35 is pressed. The electric engraving pen 30 is powered on to perform the dotting operation on the large flange 24. After dotting, the retractable variable diameter bracket assembly 1 moves upward as a whole, the electric engraving pen 30 resets downward, and the power is disconnected, and the dotting of the large flange 24 is completed.

[0059] After the large flange 24 is dotted, the large flange 24 is moved to a drilling machine, and drilling operations are performed on the flange to form equally divided holes based on the dotted positions.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A telescopic variable diameter bracket assembly, characterized in that: The hinge assembly comprises an upper hinge seat, a lower hinge seat, a support rod, and a hinge seat spacing adjuster connected between the upper hinge seat and the lower hinge seat for changing the distance between the upper hinge seat and the lower hinge seat, the support rod comprising N upper support rods arranged on the upper hinge seat along the circumferential direction and N lower support rods arranged on the lower hinge seat along the circumferential direction, and one end of the N upper support rods is rotatably connected to the upper hinge seat through a first hinge shaft, one end of the N lower support rods is rotatably connected to the lower hinge seat through a first hinge shaft, and the other end of the N upper support rods is rotatably connected to the other end of the N lower support rods through a second hinge shaft respectively; The retractable variable diameter bracket assembly is used for anti-deformation support during cylinder welding, or for deburring the keyway edge of the spline hole of the workpiece, or for dotting operations before drilling large flange parts; and when the retractable variable diameter bracket assembly is used for dotting operations before drilling large flange parts, the hinge seat spacing adjuster adopts a servo electric push rod, and the retractable variable diameter bracket assembly used for dotting operations is also provided with a pair of directional control rods between the upper support rod and the lower support rod, one end of the pair of directional control rods is respectively rotatably connected to the upper support rod and the lower support rod through a third hinge shaft, and the other ends of the pair of directional control rods are rotatably connected through a fourth hinge shaft; a horizontal cross bar is rotatably provided at one end of the second hinge shaft, a hole seat is provided on the fourth hinge shaft, a transverse through hole is provided on the hole seat, and the horizontal cross bar slides in the transverse through hole; a dotting assembly is provided on the horizontal cross bar, and the dotting assembly includes an electric engraving pen arranged on the horizontal cross bar and with the pen tip facing downward; a gantry and a gantry located on the gantry are also provided. The dotting workbench is at the bottom middle of the frame, the base of the servo electric push rod is fixed on the lifting mechanism, and when in use, the large flange is positioned and fixed by the positioning tool set on the dotting workbench; the dotting assembly also includes an automatic dotting opening and closing device arranged on the horizontal cross bar, and the automatic dotting opening and closing device includes an engraving pen mounting seat fixed on the horizontal cross bar, and a lifting cylinder clamp arranged in the inner hole of the engraving pen mounting seat and movable along the up and down directions, an anti-rotation key is provided between the lifting cylinder clamp and the inner hole of the engraving pen mounting seat, an upper retaining ring is provided on the upper end outer circle of the lifting cylinder clamp, a lower stop shoulder is provided on the lower end outer circle of the lifting cylinder clamp, and a pressure spring for pressing the lifting cylinder clamp downward is provided between the lower end surface of the engraving pen mounting seat and the lower stop shoulder of the lifting cylinder clamp, the electric engraving pen is fixed in the lifting cylinder clamp, and a self-resetting opening and closing button is provided on the top of the electric engraving pen, and a button baffle for blocking the self-resetting opening and closing button is provided at intervals above the self-resetting opening and closing button on the horizontal cross bar.

2. The telescopic variable diameter bracket assembly according to claim 1, characterized in that: The hinge seat spacing adjuster is a basket bolt; the basket bolt includes a ring part and an upper stud and a lower stud respectively integrally connected to the upper and lower ends of the ring part, the upper stud is threadedly connected to the center threaded hole on the upper hinge seat, and the lower stud is threadedly connected to the center threaded hole on the lower hinge seat.

3. The telescopic variable diameter bracket assembly according to claim 1, characterized in that: The hinge seat spacing adjuster is a cylinder, the cylinder body of the cylinder is fixedly connected to the upper hinge seat, and the piston rod of the cylinder is fixedly connected to the lower hinge seat.

4. The telescopic variable diameter bracket assembly according to claim 1, characterized in that: The hinge seat spacing adjuster is a servo electric push rod, the base of the servo electric push rod is fixedly connected to the upper hinge seat, and the telescopic rod of the servo electric push rod is fixedly connected to the lower hinge seat.

5. The telescopic variable diameter bracket assembly according to claim 4, characterized in that: A pressure sensor is provided on the telescopic rod of the servo electric push rod.

6. The telescopic variable diameter bracket assembly according to claim 1, characterized in that: The N upper support rods and the N lower support rods are respectively arranged at even intervals along the circumferential direction.

7. The telescopic variable diameter bracket assembly according to any one of claims 1 to 6, characterized in that: When the telescopic variable diameter bracket assembly is used for anti-deformation support during cylinder welding, the telescopic variable diameter bracket assembly is placed in the inner hole of the cylinder. By operating the hinge seat spacing adjuster, the end of each support rod close to the second hinge shaft is pressed against the inner hole wall of the cylinder.

8. The telescopic variable diameter bracket assembly according to any one of claims 3 or 4, characterized in that: When the retractable variable diameter bracket assembly is used to deburr the keyway edge of the spline hole of the workpiece, a pair of deburring rolling wheels are respectively installed at both ends of the second hinge shaft through bearings, and the hinge seat spacing adjuster adopts a cylinder; when in use, the retractable variable diameter bracket assembly is placed in the spline hole of the workpiece, and under the action of the cylinder, the pair of rolling wheels at both ends of the second hinge shaft correspondingly contact the keyway edges on both sides of the spline hole, and the retractable variable diameter bracket assembly is moved back and forth as a whole along the central axis of the spline hole, thereby driving the pair of deburring rolling wheels to roll and deburr the keyway edge of the spline hole.

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