An automated cutting device for bicycle tube shaft parts

Abstract

The present invention relates to the technical field of automatic turning of bicycle down tubes, and specifically discloses an automatic cutting device for bicycle tube shaft parts, which is used for turning both ends of the down tube to facilitate the welding connection of both ends thereof with the head tube and the bottom bracket shell respectively. The device includes a multi-axis robotic arm and a mounting plate installed at the front end of the multi-axis robotic arm, and further includes a flipping assembly and a mounting base frame. An end turning assembly for turning the end of the down tube is installed inside the mounting base frame. In the turning part of the present invention, the turning sleeve can be conveniently disassembled and replaced, which is convenient for the device to adapt to the turning treatment of different down tube ends, and can adjust the turning sleeve to a suitable size according to different batches of frame models, etc. Moreover, the end turning assembly in the present invention can not only turn the end of the down tube matching the head tube in the vertical state, but also quickly switch to the longitudinally flat state to turn the other end of the down tube matching the bottom bracket shell, and the flexibility of turning processing is high.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic turning of bicycle down tubes, and particularly relates to an automatic cutting device for bicycle tube shaft parts. Background Art

[0002] In 2024, the Chinese bicycle market continued its prosperous development momentum, the cycling craze continued to heat up, and consumer demand tended to be diversified and high-end. Road bikes became the most popular models, with the ownership ratio reaching 78.75%, hitting a record high.

[0003] The development of the bicycle industry has introduced industries such as cutting and welding. A bicycle frame generally consists of a head tube, an upper tube, a down tube, a seat tube, a rear upper fork, a rear lower fork, a seat tube, etc. One end of the down tube is connected to the head tube, and the other end of the down tube is connected to the rear lower fork, seat tube, etc. through a bottom bracket tube. The extension lines of the axis of the head tube and the bottom bracket tube are perpendicular and non-intersecting. In the prior art, most rely on workers to use angle grinding tools to perform angle grinding on both ends of the down tube to facilitate the subsequent alignment welding and assembly of the head tube and the bottom bracket tube. However, manual operation is prone to the situation that the fitting gap is irregular, which will affect the subsequent welding operation, cannot ensure the reliability of welding fixation, and will also affect the aesthetics of the product. Summary of the Invention

[0004] The purpose of the invention is to provide an automatic cutting device for bicycle tube shaft parts to solve the problem in the prior art that relying on workers to use angle grinding tools to perform angle grinding on both ends of the down tube is prone to irregular welds, thereby affecting the welding effect.

[0005] To achieve the above purpose, the invention provides the following technical solutions:

[0006] An automatic cutting device for bicycle tube shaft parts, which is used for turning both ends of the down tube to facilitate the welding connection of both ends with the head tube and the bottom bracket tube respectively. It includes a multi-axis robotic arm and a mounting plate installed at the front end of the multi-axis robotic arm, and also includes a flipping assembly and a mounting base frame. The flipping assembly and the mounting base frame are respectively installed on both sides of the mounting plate. An end turning assembly for turning the end of the down tube is installed inside the mounting base frame. The flipping assembly can drive the mounting base frame and the end turning assembly to perform azimuth flipping to facilitate the end turning assembly to perform separate turning operations on both ends of the down tube.

[0007] Preferably: The mounting base frame includes an annular cover. An attachment disk is fixedly installed inside the annular cover. A support frame connected to the end turning assembly is installed on the side of the attachment disk facing away from the flipping assembly.

[0008] Preferably, the end turning assembly includes a main mounting frame and a side connecting frame. The side connecting frame is fixedly connected to the support frame, and the main mounting frame is fixed on the side of the side connecting frame facing away from the flipping assembly. A boss is installed at one end of the main mounting frame, and a second driving member is installed at the other end of the main mounting frame. A turning member is rotatably arranged between the main mounting frames. The second driving member is arranged to match the turning member, and a secondary rotating member matching the turning member is detachably installed on the boss through a fastening bolt.

[0009] Preferably, the turning member includes a main rotating shaft body rotatably installed in the main mounting frame. A fixed clamping sleeve is fixedly sleeved at one end of the main rotating shaft body close to the second driving member. A turning sleeve is sleeved outside the main rotating shaft body. The flipping assembly can drive the turning sleeve to switch between two states of vertical placement and longitudinal placement, realizing differential turning of both ends of the lower pipe, facilitating the welding and alignment of both ends of the lower pipe with the vertical head tube and the longitudinal middle shaft tube in the vehicle frame respectively. A movable clamping sleeve matching the turning sleeve is movably arranged at the end of the main rotating shaft body facing away from the fixed clamping sleeve, and a locking member connected to the movable clamping sleeve is also arranged at the end of the main rotating shaft body facing away from the fixed clamping sleeve.

[0010] Preferably, a threaded groove is opened at the end of the main rotating shaft body facing away from the fixed clamping sleeve. The locking member includes a locking sleeve. An internal thread that is in threaded cooperation with the threaded groove is arranged on the inner wall of the locking sleeve. At least two connecting vertical rods are evenly installed at the end of the locking sleeve. The ends of the multiple connecting vertical rods facing away from the locking sleeve are fixedly connected to the movable clamping sleeve; and two gripping rods are symmetrically installed outside the locking sleeve.

[0011] Preferably, the secondary rotating member includes a docking platform. A rotating column is rotatably arranged in the docking platform through a bearing, and a resisting rod is fixedly connected to the end of the rotating column; and a resisting groove matching the cross-section of the end of the resisting rod is opened on the end face of the main rotating shaft body facing away from the second driving member. When the secondary rotating member is removed, it is convenient to remove the turning sleeve. When the secondary rotating member is reinstalled, it can provide auxiliary support for the rotational turning of the newly installed turning sleeve.

[0012] Preferably, several strip-shaped protrusions are circumferentially arranged on the outer surface of the middle part of the main rotating shaft body along its axis, and corresponding resisting grooves matching the number of strip-shaped protrusions are opened on the inner wall of the turning sleeve, facilitating the quick installation of turning sleeves with different outer diameters onto the main rotating shaft body.

[0013] Preferably, the second driving member includes a second housing fixed on the end face of the main mounting frame. A second driving motor fixed on the end face of the main mounting frame is arranged inside the second housing. A driving bevel gear is fixed on the output shaft of the second driving motor. A driven bevel gear is fixedly sleeved on the end of the main rotating shaft body extending into the second housing. The driven bevel gear is meshed with the driving bevel gear.

[0014] Preferably, the flipping assembly includes a first driving motor and a first driving member. The first driving member includes a first rotating shaft rotatably installed in the middle of the mounting plate, and it penetrates through both sides of the mounting plate. One end of the first rotating shaft facing away from the multi-axis robotic arm is fixedly connected to the attachment disk, and a driven gear is fixedly sleeved on the end of the first rotating shaft close to the multi-axis robotic arm. A driving gear is installed on the output shaft of the first driving motor, and the driving gear is meshed with the driven gear.

[0015] Preferably, the flipping assembly further includes a first housing, which is fixed on the side of the mounting plate close to the multi-axis robotic arm. The first driving motor and the first driving member are both arranged in the first housing, which plays a role in shielding and protecting the two.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The turning sleeve in the turning part of the present invention can be conveniently disassembled and replaced, which is convenient for the device to adapt to the turning process of different lower tube ends. It can adjust the turning sleeve to a suitable size according to the outer diameter dimensions of the head tube and the middle shaft tube that need to be assembled, such as different batches of frame models, to ensure that the outer diameter of the turning sleeve matches the outer diameters of the head tube and the middle shaft tube. Then, the second driving member drives the turning part to rotate at a high speed, and the turning process of the lower tube end can be quickly realized, which is stable and reliable.

[0018] 2. Regarding the orientation characteristics of the head tube and the middle shaft tube that need to be welded and matched at both ends of the lower tube in the frame, that is, the extension lines of the center lines of the head tube and the middle shaft tube are perpendicular and non-intersecting. With the flipping assembly, the end turning assembly can be rotated by 90 degrees at the appropriate time, so that the end turning assembly can not only turn the end of the lower tube that matches the head tube in the vertical state, but also quickly switch to the longitudinally flat state to turn the other end of the lower tube that matches the middle shaft tube. The practicability of the device is greatly improved, and it is flexible and reliable.

[0019] 3. The present invention cooperates with a multi-axis robotic arm to quickly process the lower tubes with ends to be turned on the production line in sequence. The matching setting of the locking part on the moving clamping sleeve and the thread groove at the end of the main rotating shaft body can achieve the purpose of quickly replacing the turning sleeve outside the main rotating shaft body. And the matching setting of the anti-slip groove and the anti-slip rod in the auxiliary rotating part can improve the stability of the replaceable turning sleeve during high-speed rotation work, avoid situations such as breakage and vibration, and improve the reliability of the device operation. Description of the Drawings

[0020] Figure 1 It is a schematic assembly diagram of the upper and lower tubes, head tube, and middle shaft tube of a bicycle in the prior art;

[0021] Figure 2 It is a three-dimensional view of the present invention;

[0022] Figure 3 Side view of the present invention;

[0023] Figure 4 Exploded view of the mounting plate and the flipping assembly of the present invention;

[0024] Figure 5 Schematic diagram of the mounting base frame and the end turning assembly of the present invention;

[0025] Figure 6 Schematic diagram of the end turning assembly of the present invention;

[0026] Figure 7 Exploded view of the turning part of the present invention;

[0027] Figure 8 Exploded view of the main rotating shaft body and the turning sleeve of the present invention.

[0028] In the figure:

[0029] 1. Lower pipe;

[0030] 2. Head pipe;

[0031] 3. Middle shaft pipe;

[0032] 4. Multi-axis robotic arm;

[0033] 5. Mounting plate;

[0034] 6. Flipping assembly; 61. First housing; 62. First driving motor; 63. First driving member; 631. First rotating shaft; 632. Driven gear; 633. Driving gear;

[0035] 7. Mounting base frame; 71. Ring cover; 72. Attachment plate; 73. Support frame;

[0036] 8. End turning assembly; 81. Main mounting frame; 82. Side connecting frame; 83. Boss; 84. Auxiliary rotating member; 841. Docking platform; 842. Rotating column; 843. Latching rod; 85. Turning part; 851. Main rotating shaft body; 8511. Threaded groove; 8512. Latching groove; 8513. Strip-shaped protrusion; 852. Turning sleeve; 8521. Strip-shaped groove; 853. Fixed clamping sleeve; 854. Movable clamping sleeve; 855. Locking member; 8551. Locking sleeve; 8552. Holding rod; 8553. Connecting vertical rod; 8554. Internal thread; 86. Second driving member; 861. Second housing; 862. Second driving motor; 863. Driving bevel gear; 864. Driven bevel gear. Detailed implementation manners

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] Referring to Figures 1-5 As shown, the present invention provides an automatic cutting device for bicycle tube shaft parts, which is used for turning both ends of the down tube 1 to facilitate the welding connection of both ends to the head tube 2 and the bottom bracket shell 3 respectively. During welding and assembly, one end of the down tube 1 is connected to the head tube 2, and the other end of the down tube 1 is connected to the rear lower fork, the seat tube, etc. through the bottom bracket shell 3. It should be noted that the extension lines of the axis of the head tube 2 and the bottom bracket shell 3 are perpendicular and non-intersecting. The device includes a multi-axis robotic arm 4 and a mounting plate 5 installed at the front end of the multi-axis robotic arm 4, and further includes a flipping assembly 6 and a mounting base frame 7. The flipping assembly 6 and the mounting base frame 7 are respectively installed on both sides of the mounting plate 5. An end turning assembly 8 for turning the end of the down tube 1 is installed inside the mounting base frame 7. The flipping assembly 6 can drive the mounting base frame 7 and the end turning assembly 8 to perform azimuth flipping, facilitating the end turning assembly 8 to perform separate turning operations on both ends of the down tube 1. Specifically, aiming at the azimuth characteristics of the head tube 2 and the bottom bracket shell 3 that need to be welded and matched at both ends of the down tube 1 in the frame, that is, the characteristic that the extension lines of the axis of the head tube 2 and the bottom bracket shell 3 are perpendicular and non-intersecting, in cooperation with the flipping assembly 6, the end turning assembly 8 can be rotated by 90 degrees at an appropriate time, so that the end turning assembly 8 can not only be in a vertical state to turn the end of the down tube 1 matching the head tube 2, but also quickly switch to a longitudinally flat state to turn the other end of the down tube 1 matching the bottom bracket shell 3; the mounting base frame 7 includes an annular cover 71, an attachment disk 72 is fixedly installed inside the annular cover 71, and a support frame 73 connected to the end turning assembly 8 is installed on the side of the attachment disk 72 facing away from the flipping assembly 6; the end turning assembly 8 includes a main mounting frame 81 and a side connection frame 82, the side connection frame 82 is fixedly connected to the support frame 73, and the main mounting frame 81 is fixed on the side of the side connection frame 82 facing away from the flipping assembly 6; a boss 83 is installed at one end of the main mounting frame 81, a second driving member 86 is installed at the other end of the main mounting frame 81, a turning member 85 is rotatably arranged between the main mounting frames 81, the second driving member 86 is matched with the turning member 85, the second driving member 86 provides power for the high-speed rotation of the turning member 85, and an auxiliary rotating member 84 matching the turning member 85 is detachably installed on the boss 83 through a fastening bolt. The auxiliary rotating member 84 can provide support for the high-speed rotating turning member 85 to prevent the turning member 85 from breaking off, vibrating, etc.

[0039] In a further embodiment, referring to Figures 6-8, the turning part 85 includes a main rotating shaft body 851 rotatably installed in the main mounting frame 81. A fixed clamping sleeve 853 is fixedly sleeved at one end of the main rotating shaft body 851 close to the second driving part 86. A turning sleeve 852 is sleeved outside the main rotating shaft body 851. The flipping assembly 6 can drive the turning sleeve 852 to switch between two states of vertical placement and longitudinal placement, realizing differential turning of both ends of the lower tube 1, facilitating the welding and alignment of both ends of the lower tube 1 with the vertical head tube 2 and the longitudinal middle shaft tube 3 in the vehicle frame respectively. At one end of the main rotating shaft body 851 opposite to the fixed clamping sleeve 853, a movable clamping sleeve 854 matching the turning sleeve 852 is movably arranged. Anti-slip rubber rings are fixed on the opposite end faces of the fixed clamping sleeve 853 and the movable clamping sleeve 854 through epoxy resin adhesives, improving the tightening and fixing ability of the two to the turning sleeve 852. And a locking part 855 connected to the movable clamping sleeve 854 is also arranged at one end of the main rotating shaft body 851 opposite to the fixed clamping sleeve 853; a threaded groove 8511 is opened at one end of the main rotating shaft body 851 opposite to the fixed clamping sleeve 853. The locking part 855 includes a locking sleeve 8551. An internal thread 8554 threadedly matched with the threaded groove 8511 is arranged on the inner wall of the locking sleeve 8551. At least two connecting vertical rods 8553 are evenly installed at the end of the locking sleeve 8551. One ends of the multiple connecting vertical rods 8553 opposite to the locking sleeve 8551 are fixedly connected to the movable clamping sleeve 854; and two holding rods 8552 are symmetrically installed outside the locking sleeve 8551; each time a new-sized turning sleeve 852 is replaced, that is, the outer diameter of the turning sleeve 852 is different, the corresponding turning range of the end of the lower tube 1 is also different, ensuring that the device can adapt to the turning processing before the assembly of the head tube 2 and the middle shaft tube 3 with different outer diameters. Specifically, when replacing the turning sleeve 852, the auxiliary rotating part 84 is removed from the boss 83, hold the two holding rods 8552 by hand, rotate to remove the movable clamping sleeve 854, then take out the turning sleeve 852 upward, then put on a new turning sleeve 852, hold the two holding rods 8552 by hand, put on the locking sleeve 8551 again, and rotate the locking sleeve 8551 in the reverse direction to make the movable clamping sleeve 854 press down tightly on the turning sleeve 852, and the replacement operation of the turning sleeve 852 can be realized.

[0040] In this embodiment, the turning sleeve 852 in the turning part 85 can be conveniently disassembled and replaced, facilitating the device to adapt to the turning treatment of different ends of the lower tube 1. According to different batches of vehicle frame models, etc., the outer diameter size of the head tube 2 and the middle shaft tube 3 to be assembled can be compared, and the turning sleeve 852 can be adjusted to a suitable size to ensure that the outer diameter of the turning sleeve 852 is adapted to the outer diameters of the head tube 2 and the middle shaft tube 3.

[0041] In a further embodiment, refer to Figure 5 and Figure 6, the auxiliary rotating part 84 includes a docking platform 841. A rotating column 842 is rotatably arranged in the docking platform 841 through a bearing. A clamping rod 843 is fixedly connected to the end of the rotating column 842. And a clamping groove 8512 matching the cross-section of the end of the clamping rod 843 is formed on the end face of the main rotating shaft body 851 facing away from the second driving part 86. When the auxiliary rotating part 84 is removed, it is convenient to remove the turning sleeve 852. When the auxiliary rotating part 84 is reinstalled, it can assist in supporting the rotation turning of the newly installed turning sleeve 852. Specifically, the cross-section of the clamping rod 843 is a rhombus structure. Correspondingly, the cross-section of the clamping groove 8512 is also designed as a rhombus structure. When the clamping rod 843 is clamped with the clamping groove 8512, it can avoid the occurrence of shaking and vibration during the rotation of the main rotating shaft body 851. And the rotating column 842 connected to the clamping rod 843 is rotatably arranged in the docking platform 841, which can ensure that the main rotating shaft body 851 can only rotate and cannot move up and down, that is, it can only rotate radially and cannot displace axially.

[0042] In this embodiment, the matching setting of the clamping groove 8512 and the clamping rod 843 in the auxiliary rotating part 84 can improve the stability of the replaceable turning sleeve 852 during high-speed rotation work, avoid the occurrence of situations such as breaking off and shaking, and improve the reliability of the device operation.

[0043] In a further embodiment, referring to Figure 8 , several strip-shaped protrusions 8513 are circumferentially arranged on the outer surface of the middle part of the main rotating shaft body 851 along its axis. And corresponding clamping grooves 8512 matching the number of the strip-shaped protrusions 8513 are formed on the inner wall of the turning sleeve 852, which is convenient for quickly installing turning sleeves 852 with different outer diameters onto the main rotating shaft body 851.

[0044] In this embodiment, the matching setting of the strip-shaped protrusions 8513 and the strip-shaped grooves 8521 can facilitate the quick sleeving of turning sleeves 852 with different sizes onto the outside of the main rotating shaft body 851, and can avoid the self-rotation of the turning sleeve 852 when the main rotating shaft body 851 rotates at high speed later, realizing the firm locking of the turning sleeve 852 and the main rotating shaft body 851.

[0045] In a further embodiment, referring to Figure 6 , the second driving part 86 includes a second housing 861 fixed on the end face of the main mounting frame 81. Several heat dissipation narrow slits can be arranged on the side surface of the second housing 861 to provide the possibility for heat dissipation of the second driving motor 862. A second driving motor 862 fixed on the end face of the main mounting frame 81 is arranged in the second housing 861. A driving bevel gear 863 is fixed on the output shaft of the second driving motor 862. A driven bevel gear 864 is fixedly sleeved on the outer end of the main rotating shaft body 851 extending into the second housing 861. The driven bevel gear 864 is meshed and connected with the driving bevel gear 863.

[0046] In this embodiment, starting the second drive motor 862 can drive the rotation of the active bevel gear 863 connected thereto. The rotation of the active bevel gear 863 can meshingly drive the rotation of the driven bevel gear 864. The rotation of the driven bevel gear 864 can drive the rotation of the main rotating shaft body 851 inserted therein. The rotation of the main rotating shaft body 851 drives the rotation of the turning sleeve 852, and thus the purpose of turning the end of the lower pipe 1 can be achieved.

[0047] In a further embodiment, referring to Figure 4 , the flipping assembly 6 includes a first drive motor 62 and a first drive member 63. The first drive member 63 includes a first rotating shaft 631 rotatably installed in the middle of the mounting plate 5, and it is arranged through both sides of the mounting plate 5. The end of the first rotating shaft 631 facing away from the multi-axis robotic arm 4 is fixedly connected to the attachment disk 72. A driven gear 632 is fixedly sleeved on the end of the first rotating shaft 631 close to the multi-axis robotic arm 4. A driving gear 633 is installed on the output shaft of the first drive motor 62. The driving gear 633 is meshingly connected to the driven gear 632. When the first drive motor 62 is started, it drives the driving gear 633 to rotate. The rotation of the driving gear 633 can drive the rotation of the driven gear 632. The rotation of the driven gear 632 can drive the rotation of the first rotating shaft 631. The rotation of the first rotating shaft 631 can drive the rotation of the mounting base 7, and thus the purpose of driving and rotating the end turning assembly 8 is achieved. The flipping assembly 6 further includes a first housing 61. The first housing 61 is fixed on the side of the mounting plate 5 close to the multi-axis robotic arm 4. The first drive motor 62 and the first drive member 63 are both arranged in the first housing 61, which plays a role of shielding and protecting the two. [[ID=A]] [[ID=B]]

[0048] In this embodiment, by starting the first drive motor 62, it drives the driving gear 633 to rotate. The rotation of the driving gear 633 can drive the rotation of the driven gear 632. The rotation of the driven gear 632 can drive the rotation of the first rotating shaft 631. The rotation of the first rotating shaft 631 can drive the rotation of the mounting base 7, and thus the purpose of driving and rotating the end turning assembly 8 is achieved. Specifically, when the turning member 85 in the end turning assembly 8 is vertically arranged, cooperating with the turning sleeve 852 of the required size, it can quickly process the end of the lower pipe 1 that needs to be butt-welded to the head pipe 2. After the end turning assembly 8 is turned by ninety degrees with the help of the flipping assembly 6, when the turning member 85 in the end turning assembly 8 is placed longitudinally flat, cooperating with the turning sleeve 852 of the required size, it can quickly process the end of the lower pipe 1 that needs to be butt-welded to the middle shaft pipe 3. The flexibility of the device in use is greatly improved, and the processing efficiency can also be significantly improved.

[0049] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automated cutting device for bicycle tube shaft parts, which is used for turning both ends of the down tube (1) to facilitate the welding connection of both ends thereof to the head tube (2) and the bottom bracket shell (3) respectively, comprising a multi-axis robotic arm (4) and a mounting plate (5) installed at the front end of the multi-axis robotic arm (4), characterized in that, It further includes a flipping component (6) and a mounting base frame (7). The flipping component (6) and the mounting base frame (7) are respectively installed on both sides of the mounting plate (5). An end turning component (8) for turning the end of the lower pipe (1) is installed in the mounting base frame (7). The flipping component (6) can drive the mounting base frame (7) and the end turning component (8) to flip in orientation, facilitating the end turning component (8) to perform turning operations on both ends of the lower pipe (1) respectively; The mounting base frame (7) includes an annular cover (71). An attachment disk (72) is fixedly installed inside the annular cover (71). A support frame (73) connected to the end turning component (8) is installed on the side of the attachment disk (72) facing away from the flipping component (6); The end turning component (8) includes a main mounting frame (81) and a side connection frame (82). The side connection frame (82) is fixedly connected to the support frame (73). The main mounting frame (81) is fixed on the side of the side connection frame (82) facing away from the flipping component (6). A boss (83) is installed at one end of the main mounting frame (81). A second driving member (86) is installed at the other end of the main mounting frame (81). A turning member (85) is rotatably arranged between the main mounting frames (81). The second driving member (86) is arranged in a matching manner with the turning member (85). And a secondary rotating member (84) matching the turning member (85) is detachably installed on the boss (83) through a fastening bolt; The turning member (85) includes a main rotating shaft body (851) rotatably installed in the main mounting frame (81). A fixed clamping sleeve (853) is fixedly sleeved at one end of the main rotating shaft body (851) close to the second driving member (86). A turning sleeve (852) is sleeved outside the main rotating shaft body (851). The flipping component (6) can drive the turning sleeve (852) to switch between two states of vertical placement and longitudinal placement, realizing differential turning of both ends of the lower pipe (1), facilitating the welding and alignment of both ends of the lower pipe (1) with the vertical head tube (2) and the longitudinal bottom bracket shell (3) in the vehicle frame respectively. A moving clamping sleeve (854) matching the turning sleeve (852) is movably arranged at one end of the main rotating shaft body (851) facing away from the fixed clamping sleeve (853). And a locking member (855) connected to the moving clamping sleeve (854) is also arranged at one end of the main rotating shaft body (851) facing away from the fixed clamping sleeve (853); The secondary rotating member (84) includes a docking platform (841). A rotating column (842) is rotatably arranged inside the docking platform (841) through a bearing. A resisting rod (843) is fixedly connected to the end of the rotating column (842). And a resisting groove (8512) matching the cross-section of the end of the resisting rod (843) is formed on the end face of the main rotating shaft body (851) facing away from the second driving member (86). Removing the secondary rotating member (84) can facilitate the removal of the turning sleeve (852). Reinstalling the secondary rotating member (84) can provide auxiliary support for the rotational turning of the newly installed turning sleeve (852).

2. The automatic cutting device for bicycle tube shaft parts according to claim 1, wherein: One end of the main rotating shaft body (851) facing away from the fixed clamping sleeve (853) is provided with a threaded groove (8511). The locking member (855) includes a locking sleeve (8551). The inner wall of the locking sleeve (8551) is provided with an internal thread (8554) that is in threaded cooperation with the threaded groove (8511). At least two connecting vertical rods (8553) are evenly installed at the end of the locking sleeve (8551). One end of the plurality of connecting vertical rods (8553) facing away from the locking sleeve (8551) is fixedly connected to the movable clamping sleeve (854); and two gripping rods (8552) are symmetrically installed outside the locking sleeve (8551).

3. An automated cutting device for bicycle tube shaft parts according to claim 1, characterized in that: A plurality of strip-shaped protrusions (8513) are circumferentially arranged on the outer surface of the middle part of the main rotating shaft body (851) along its axis line. And corresponding anti-slotted grooves (8512) matching the number of the strip-shaped protrusions (8513) are formed on the inner wall of the turning sleeve (852), which facilitates the quick installation of turning sleeves (852) with different outer diameters onto the main rotating shaft body (851).

4. An automated cutting device for bicycle tube shaft parts according to claim 1, characterized in that: The second driving member (86) includes a second housing (861) fixed on the end face of the main mounting frame (81). A second driving motor (862) fixed on the end face of the main mounting frame (81) is arranged inside the second housing (861). A driving bevel gear (863) is fixed on the output shaft of the second driving motor (862). A driven bevel gear (864) is fixedly sleeved outside one end of the main rotating shaft body (851) extending into the second housing (861). A meshing connection is arranged between the driven bevel gear (864) and the driving bevel gear (863).

5. An automated cutting device for bicycle tube shaft parts according to any one of claims 2-4, characterized in that: The flipping assembly (6) includes a first driving motor (62) and a first driving member (63). The first driving member (63) includes a first rotating shaft (631) rotatably installed in the middle of the mounting plate (5), and it penetrates through both sides of the mounting plate (5). One end of the first rotating shaft (631) facing away from the multi-axis robotic arm (4) is fixedly connected to the attachment disc (72). A driven gear (632) is fixedly sleeved on one end of the first rotating shaft (631) close to the multi-axis robotic arm (4). A driving gear (633) is installed on the output shaft of the first driving motor (62). A meshing connection is arranged between the driving gear (633) and the driven gear (632).

6. An automated cutting device for bicycle tube shaft parts according to claim 5, characterized in that: The flipping assembly (6) further includes a first housing (61). The first housing (61) is fixed on one side of the mounting plate (5) close to the multi-axis robotic arm (4). The first driving motor (62) and the first driving member (63) are both arranged in the first housing (61), which plays a role in shielding and protecting the two of them.

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