Bicycle seat tube convenient to assemble

Abstract

According to the bicycle seat tube convenient to assemble, the positioning structure comprising the first positioning concave-convex teeth and the second positioning concave-convex teeth is arranged between the outer side wall of the sleeve piece and the inner side wall of the mounting hole, so that when a bicycle saddle and the head of the seat tube are assembled, the clamping piece can be clamped by the clamping piece through engagement between the positioning concave-convex teeth; the clamping pieces are prevented from unnecessarily rotating in the mounting holes, a user can firstly adjust the positions of the clamping pieces on the head of the seat tube, then the clamping pieces are locked in the mounting holes and do not rotate through matching of the positioning concave-convex teeth, and then the two clamping pieces are used for clamping and assembling a positioning rod of the bicycle saddle. In addition, the assembled clamping pieces are locked in the mounting holes, the situation that the seat cushion rotates on the seat tube in the riding process is reduced as much as possible, and the safety between the seat tube and the seat cushion in the riding process and the stability of connection are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle accessories, in particular to a bicycle seat tube which is easy to assemble. Background Art

[0002] The bicycle seat post is an important component connecting the frame and the rider's seat. Its design and structure are directly related to the comfort, stability and safety of the bicycle. With the development of the bicycle industry and the advancement of technology, the design and materials of bicycle seat posts are also constantly evolving, from the initial fixed design to the height-adjustable quick-release and pneumatic seat posts. Each innovation aims to improve the comfort and convenience of riding.

[0003] In the traditional bicycle seat tube design, the seat tube is inserted into the seat tube of the bicycle frame through its lower end, and the upper end fixes the rider's seat cushion. In order to fix the seat cushion on the seat tube, the head of the seat tube is usually equipped with a pair of sleeves (also called clamps or fixers). The two sleeves can clamp the seat cushion iron frame on the seat tube to ensure the stability of the seat cushion. However, this design has certain problems in practical application.

[0004] The main problem currently existing is that there is no effective positioning structure between the sleeve and the seat tube head. This lack of positioning design causes the sleeve to easily rotate on the seat tube head when installing or adjusting the seat cushion, making the installation and adjustment of the seat cushion more difficult, especially when the seat cushion angle and position need to be precisely adjusted. This not only increases the complexity of installation and adjustment, but may also affect the stability and safety during riding. For example, if the seat cushion rotates during riding, it may cause the rider to lose balance and increase the risk of accidents.

[0005] The utility model is proposed in view of the deficiencies in the prior art. Utility Model Content

[0006] The present invention aims to solve the technical problem that no effective positioning structure is provided between the sleeve and the seat tube head in the prior art mentioned above.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] A bicycle seat tube that is easy to assemble, comprises a seat tube body and a seat tube head, wherein the seat tube head is provided with a mounting hole, wherein a pair of first and second sets of plates are provided in the mounting hole, wherein first assembly grooves are provided on both sides of the first sets of plates, and second assembly grooves corresponding to the first assembly grooves are provided on both sides of the second sets of plates, respectively; a positioning structure is provided between the outer side wall of the first sets of plates and / or the second sets of plates and the inner side wall of the mounting hole, wherein the positioning structure comprises first positioning concave-convex teeth provided on the outer side wall of the sets of plates and second positioning concave-convex teeth provided on the inner side wall of the mounting hole, wherein the first positioning concave-convex teeth engage with the second positioning concave-convex teeth.

[0009] In the bicycle seat tube that is easy to assemble as described above, the second positioning concave-convex teeth are arranged along the axial direction of the mounting hole, and the length dimension of the first positioning concave-convex teeth is greater than the length dimension of the second positioning concave-convex teeth.

[0010] In the bicycle seat tube that is easy to assemble as described above, the number of the second positioning concave-convex teeth is greater than the number of the first positioning concave-convex teeth.

[0011] In the bicycle seat tube that is easy to assemble as described above, the length dimensions of the first assembly groove and the second assembly groove are greater than the diameter dimension of the mounting hole, the side wall of the first assembly groove close to the seat tube head is close to or abuts against the side wall of the seat tube head, and the side wall of the second assembly groove close to the seat tube head is close to or abuts against the side wall of the seat tube head.

[0012] A bicycle seat tube that is easy to assemble as described above, wherein the seat tube head includes an upper seat tube head and a lower seat tube head, wherein the lower seat tube head is arranged on the seat tube body, a rotating assembly is provided between one end of the upper seat tube head and the lower seat tube head, wherein the rotating assembly can rotatably connect the upper seat tube head with the lower seat tube head, and a locking assembly is provided between the other end of the upper seat tube head and the lower seat tube head, wherein the locking assembly can lock the upper seat tube head on the lower seat tube head.

[0013] A bicycle seat tube that is easy to assemble as described above, the rotating assembly includes a rotating shaft arranged on the upper seat tube head and a rotating groove arranged on the lower seat tube head, a connecting arm is provided between the rotating shaft and the upper seat tube head, the width dimension of the connecting arm is smaller than the diameter dimension of the rotating shaft, the rotating groove includes a swinging groove and a rotating shaft groove that are connected in sequence from top to bottom, the rotating shaft is rotatably connected in the rotating shaft groove, the connecting arm is located in the swinging groove, and there is a swinging gap between the inner side wall of the swinging groove and the outer side wall of the connecting arm.

[0014] In the bicycle seat tube that is easy to assemble as described above, the connecting arm is located in the middle area of ​​the end portion of the upper seat tube head.

[0015] As described above, a bicycle seat tube that is easy to assemble, the locking assembly includes a first locking hole, a second locking hole and a locking piece, the first locking hole is arranged on the upper seat tube head, the second locking hole is arranged on the lower seat tube head, and the locking piece passes through the second locking hole and is connected to the first locking hole.

[0016] In the bicycle seat tube that is easy to assemble as described above, the locking member is a connecting bolt, the first locking hole is a threaded hole, and the end of the second locking hole facing the seat tube body is a countersunk hole that can accommodate the head of the connecting bolt.

[0017] In the bicycle seat tube that is easy to assemble as described above, the first locking hole is arranged obliquely from bottom to top on the upper seat tube head toward the mounting hole, and the second locking hole is arranged obliquely from bottom to top on the lower seat tube head toward the mounting hole.

[0018] The beneficial effects of the utility model are:

[0019] The utility model discloses a bicycle seat tube which is easy to assemble. By arranging a positioning structure including a first positioning concave-convex tooth and a second positioning concave-convex tooth between the outer side wall of a sleeve and the inner side wall of a mounting hole, when the bicycle seat is assembled with the seat tube head, the clamping piece can prevent the clamping piece from unnecessary rotation in the mounting hole by the engagement between the positioning concave-convex teeth. The user can first adjust the position of the clamping piece on the seat tube head, and then lock the clamping piece in the mounting hole through the cooperation of the positioning concave-convex teeth so that the clamping piece will not rotate. Then, the two clamping pieces are clamped and assembled on the positioning rod of the bicycle seat, thereby simplifying the installation and adjustment of the seat. Moreover, the clamping piece after assembly is locked in the mounting hole, so as to minimize the rotation of the seat on the seat during riding, thereby ensuring the safety between the seat tube and the seat and the stability of the connection during riding.

[0020] The utility model will be further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is one of the structural schematic diagrams of the utility model;

[0022] Figure 2 This is the second structural diagram of the utility model;

[0023] Figure 3 This is one of the exploded schematic diagrams of the utility model;

[0024] Figure 4 This is the second exploded schematic diagram of the utility model;

[0025] Figure 5 It is a top view schematic diagram of the utility model;

[0026] Figure 6 for Figure 5 Schematic cross-sectional view along line AA. DETAILED DESCRIPTION

[0027] The implementation modes of the present utility model are described in detail below in conjunction with the accompanying drawings.

[0028] like Figures 1 to 6 As shown, a bicycle seat tube that is easy to assemble in this embodiment includes a seat tube body 1 and a seat tube head 2, wherein the seat tube head 2 is provided with a mounting hole 21, wherein a pair of first and second sets of plates 3 and 4 are provided in the mounting hole 21, wherein the first sets of plates 3 are provided with first assembly grooves 31 on both sides, wherein the second sets of plates 4 are provided with second assembly grooves 41 corresponding to the first assembly grooves 31 on both sides, wherein a positioning structure is provided between the outer side wall of the first sets of plates 3 and / or the second sets of plates 4 and the inner side wall of the mounting hole 21, wherein the positioning structure includes first positioning concave-convex teeth 5 provided on the outer side wall of the sets of plates and second positioning concave-convex teeth 6 provided on the inner side wall of the mounting hole 21, wherein the first positioning concave-convex teeth 5 and the second positioning concave-convex teeth 6 are engaged with each other.

[0029] Specifically, by providing a positioning structure including a first positioning concave-convex tooth 5 and a second positioning concave-convex tooth 6 between the outer wall of the sleeve and the inner wall of the mounting hole, when the bicycle seat and the seat tube head 2 are assembled, the clip can prevent the clip from unnecessary rotation in the mounting hole by the engagement between the positioning concave-convex teeth. The user can first adjust the position of the clip on the seat tube head 2, and then lock the clip in the mounting hole through the cooperation of the positioning concave-convex teeth to prevent it from rotating. Then, the two clips are clamped and assembled on the positioning rod of the bicycle seat, thereby simplifying the installation and adjustment of the seat. Moreover, the assembled clip is locked in the mounting hole to minimize the rotation of the seat on the seat tube during riding, thereby ensuring the safety of the seat tube and the stability of the connection during riding.

[0030] Preferably, both of the two sets of plates are provided with positioning concave-convex teeth, or one set of plates is provided with positioning concave-convex teeth, which can be selected according to actual needs.

[0031] In this embodiment, both sets of plates are provided with positioning concave and convex teeth, which can provide a stable connection performance.

[0032] like Figures 1 to 6 As shown, the second positioning concave-convex teeth 6 of this embodiment are arranged along the axial direction of the mounting hole 21 , and the length dimension of the first positioning concave-convex teeth 5 is greater than the length dimension of the second positioning concave-convex teeth 6 .

[0033] Specifically, such a layout can ensure stable positioning support in the axial direction. The axial concave-convex matching design not only makes the installation process more natural and smooth, but also can effectively resist the displacement caused by vibration or impact when the seat cushion is subjected to up and down forces, thereby ensuring the fixation and stability of the seat cushion during riding.

[0034] Preferably, the length dimension of the first positioning concave-convex tooth 5 is greater than the length dimension of the second positioning concave-convex tooth 6. This design allows for greater tolerance during assembly, allowing the sleeve to be more easily aligned with the positioning structure in the mounting hole. In addition, this size difference also means that the first positioning concave-convex tooth can engage with the second positioning concave-convex tooth over a larger range, further enhancing the stability of the connection. Even if it is subjected to a large impact force during riding, this design can ensure that the sleeve will not be easily dislocated, thereby maintaining the fixed position of the seat cushion and ensuring the safety of the rider.

[0035] like Figures 1 to 6 As shown, the number of the second positioning concave-convex teeth 6 in this embodiment is greater than the number of the first positioning concave-convex teeth 5 .

[0036] Specifically, by setting more second positioning concave-convex teeth 6, more matching options can be provided for the first positioning concave-convex teeth 5, which means that during assembly, the first positioning concave-convex teeth 5 can find matching second positioning concave-convex teeth 6 in more positions, thereby making the assembly process more flexible, reducing the difficulty of assembly, and reducing assembly errors caused by improper alignment.

[0037] Moreover, a larger number of second positioning concave-convex teeth 6 can form an effective engagement with the first positioning concave-convex teeth 5 in a larger range. This multi-point engagement method makes the connection between the seat tube and the seat tube head more stable. Even if it is subject to large vibrations and impacts when riding on complex roads, this design can effectively reduce the relative movement between the seat tube components and maintain the stability of the seat, thereby improving riding comfort and safety.

[0038] Furthermore, due to the large number of second positioning concave-convex teeth 6, when the user needs to adjust the seat height or angle, the clip can find the matching second positioning concave-convex teeth 6 at different angles through the cooperation between the first positioning concave-convex teeth and the second positioning concave-convex teeth, making it easier to unlock and re-lock the seat without worrying about not finding a suitable positioning point. This design not only makes daily adjustments simpler and faster, but also greatly reduces the complexity of maintaining and replacing seats.

[0039] like Figures 1 to 6As shown, the length dimension of the first assembly groove 31 and the second assembly groove 41 of this embodiment is greater than the diameter dimension of the mounting hole 21, the side wall of the first assembly groove 31 close to the seat tube head 2 is close to or abuts against the side wall of the seat tube head 2, and the side wall of the second assembly groove 41 close to the seat tube head 2 is close to or abuts against the side wall of the seat tube head 2.

[0040] Specifically, by making the length of the first assembly groove 31 and the second assembly groove 41 larger than the diameter of the mounting hole 21, a longer contact surface can be formed between the clip and the bicycle seat. This long-distance contact increases the friction and the connection area, thereby providing better stability during use, and enables the clip to form a positioning assembly on the seat tube head 2 through the first assembly groove 31 and the second assembly groove 41 without excessive positional deviation.

[0041] Preferably, the first assembly groove and the second assembly groove are close to or against the side wall of the seat tube head 2, so that when the clip tends to shift position on the seat tube head 2, the side wall of the first assembly groove or the second assembly groove will be against the side wall of the seat tube head 2 to limit the position of the clip on the seat tube head 2, so that these components are more closely combined during assembly. This nearly seamless combination is not only beautiful, but also increases the firmness and deformation resistance of the overall structure, so that the seat tube can better resist the impact and twisting forces that may be encountered during riding.

[0042] like Figures 1 to 6 As shown, the seat tube head 2 of this embodiment includes an upper seat tube head 22 and a lower seat tube head 23, and the lower seat tube head 23 is arranged on the seat tube body 1. A rotating component is provided between one end of the upper seat tube head 22 and the lower seat tube head 23, and the rotating component can make the upper seat tube head 22 and the lower seat tube head 23 rotatably connected, and a locking component is provided between the other end of the upper seat tube head 22 and the lower seat tube head 23, and the locking component can lock the upper seat tube head 22 on the lower seat tube head 23.

[0043] Specifically, the rotating assembly is located between the upper seat tube head 22 and the lower seat tube head 23, allowing the upper seat tube head 22 to rotate on the lower seat tube head 23. This rotating ability means that the user can adjust the position of the upper seat tube head 22 on the lower seat tube head 23. When the upper seat tube head 22 is unlocked on the lower seat tube head 23 by the locking assembly, the end of the upper seat tube head 22 with the locking assembly can move away from the lower seat tube head 23 so that the first positioning concave-convex teeth 5 and the second positioning concave-convex teeth 6 do not engage with each other, unlocking the clip on the seat tube head 2, thereby adjusting the angle of the seat cushion.

[0044] When the upper seat tube head 22 is locked on the lower seat tube head 23 by the locking assembly, one end of the upper seat tube head 22 having the locking assembly can move downward in the direction close to the lower seat tube head 23, so that the first positioning concave-convex teeth 5 engage with the second positioning concave-convex teeth 6, so that the clip is locked on the seat tube head 2. The user-friendliness of the locking mechanism is usually taken into consideration in the design to ensure that the rider can quickly and easily perform locking and unlocking operations, which not only improves the convenience of adjustment, but also allows the rider to quickly adjust the seat angle under different riding conditions.

[0045] like Figures 1 to 6 As shown, the rotating assembly of this embodiment includes a rotating shaft 221 arranged on the upper seat tube head 22 and a rotating groove 231 arranged on the lower seat tube head 23, a connecting arm 222 is provided between the rotating shaft 221 and the upper seat tube head 22, the width dimension of the connecting arm 222 is smaller than the diameter dimension of the rotating shaft 221, the rotating groove 231 includes a swinging groove 2311 and a rotating shaft groove 2312 which are connected in sequence from top to bottom, the rotating shaft 221 is rotatably connected in the rotating shaft groove 2312, the connecting arm 222 is located in the swinging groove 2311, and there is a swinging gap between the inner side wall of the swinging groove 2311 and the outer side wall of the connecting arm 222.

[0046] Specifically, the upper seat tube head 22 is rotated on a specific axis through the rotating shaft 221, and the rotating shaft groove 2312 ensures that the rotating shaft 221 can rotate stably therein, and the connecting arm 222 is located in the swinging groove 2311. The swinging groove 2311 provides a space for the connecting arm 222 to swing, and the swinging groove 2311 limits the rotation range of the upper seat tube head 22 on the lower seat tube head 23 by limiting the swinging angle of the connecting arm 222. The swinging angle of the connecting arm 222 is controlled by physical restriction, thereby indirectly limiting the rotation range of the upper seat tube head 22 on the lower seat tube head 23. This design allows the user to adjust the seat angle within a certain safety and functional range, which not only ensures the flexibility of use, but also ensures the safety and stability during use.

[0047] Preferably, both sides of the rotating groove 231 have openings, and the connecting arm 222 and the rotating shaft 221 can be inserted into the swing groove 2311 and the rotating shaft groove 2312 through the openings, thereby simplifying the assembly method.

[0048] like Figures 1 to 6 As shown, the connecting arm 222 of the present embodiment is located in the middle area on the end of the upper seat tube head 22, which helps to evenly distribute the load and stress between the upper seat tube head and the lower seat tube head. This balanced mechanical layout is beneficial to improving the stability and durability of the entire seat tube assembly during use, especially when adjusting the seat angle or bearing changing stress during riding.

[0049] Preferably, the configuration of the middle area is conducive to improving the bending resistance of the connecting arm 222 when subjected to longitudinal and lateral forces. Such a design ensures the stability of the seat under different riding conditions and reduces the potential risk of fatigue damage caused by stress concentration.

[0050] Preferably, by arranging the connecting arm 222 in the middle area on the end of the upper seat tube head 22, a more convenient operating space can be provided for the user to adjust the seat angle. Whether it is fine-tuning the rotation angle or operating the locking mechanism, the user can do it more conveniently, which improves the user experience. The configuration of the connecting arm 222 in the middle area allows the rotating component to more accurately control the rotation angle and the locking position when adjusting the angle. In addition, the end of the upper seat tube head 22 having the connecting arm 222 can, when rotated to the maximum angle, be able to abut against the partial top surface of the end of the lower seat tube head having the shaft groove 2312, thereby further limiting the rotation of the upper seat tube head 22 on the lower seat tube head and improving the stability of the limit.

[0051] like Figures 1 to 6 As shown, the locking assembly of this embodiment includes a first locking hole 223, a second locking hole 232 and a locking piece 233, wherein the first locking hole 223 is arranged on the upper seat tube head 22, the second locking hole 232 is arranged on the lower seat tube head 23, and the locking piece 233 passes through the second locking hole 232 and is connected to the first locking hole 223.

[0052] When the seat angle needs to be adjusted, the user can first unlock the locking piece 233 and then rotate the end of the upper seat tube head 22 with the first locking hole 223 away from the end of the lower seat tube head 23 with the second locking hole 232. The upper seat tube head 22 and the lower seat tube head 23 gradually move away from each other with a gap, so that the first positioning concave-convex tooth 5 and the second positioning concave-convex tooth 6 do not engage with each other, and the sleeve can rotate in the mounting hole 21 to adjust the angle. Once the ideal angle is reached, the user can first apply force to the clip to engage the first positioning concave-convex tooth 5 with the second positioning concave-convex tooth 6, and then through the cooperation of the locking piece 233 with the first locking hole 223 and the second locking hole 232, the end of the upper seat tube head 22 with the first locking hole 223 is rotated close to the end of the lower seat tube head 23 with the second locking hole 232, so that the first assembly groove 31 and the second assembly groove 41 gradually clamp the positioning rod of the seat cushion. This design not only ensures the stability and safety of the seat during use, but also provides flexibility in adjusting the angle.

[0053] like Figures 1 to 6 As shown, the locking member 233 of this embodiment is a connecting bolt, the first locking hole 223 is a threaded hole, and the end of the second locking hole 232 facing the seat tube body 1 is a countersunk hole capable of accommodating the head of the connecting bolt.

[0054] Specifically, the connecting bolt 233 is a standard mechanical fastener, one end of which is a bolt head and the other end is a screw with external threads. This design allows the connecting bolt to pass through the second locking hole 232 and to be screwed into the first locking hole 223 (threaded hole) to achieve stable locking.

[0055] By screwing into the threaded hole (first locking hole 223) on the upper seat tube head 22, the connecting bolt 233 firmly connects the upper seat tube head and the lower seat tube head 23 together. This connection method is not only highly stable, but also because it is threaded fastening, it can also adjust the fastening force as needed, thereby adjusting the connection tightness between the two parts.

[0056] The first locking hole 223 is designed as a threaded hole, and its inner wall has an internal thread matching the connecting bolt 233. This design allows the connecting bolt to be screwed in and tightened. By tightening or loosening the connecting bolt and the first locking hole 223, the upper seat tube head 22 can be rotated on the lower seat tube head 23.

[0057] The second locking hole 232 is located on the lower seat tube head 23, and the extension portion thereof toward one end of the seat tube body 1 is designed as a countersunk hole, which can accommodate the head of the connecting bolt 233. This design allows the bolt head to be partially or completely embedded in the lower seat tube head, thereby not causing inconvenience or discomfort to the user when riding. The existence of the countersunk hole not only provides an embedding space for the head of the connecting bolt, maintaining a neat appearance, but also increases the stability of the connection. When the connecting bolt head is embedded in the countersunk hole, its contact area with the lower seat tube head 23 is increased, thereby enhancing the stability of the entire connection structure.

[0058] like Figures 1 to 6 As shown, the first locking hole 223 of this embodiment is inclinedly arranged on the upper seat tube head 22 from bottom to top toward the mounting hole 21, and the second locking hole 232 is inclinedly arranged on the lower seat tube head 23 from bottom to top toward the mounting hole 21.

[0059] With such a design, when the connecting bolt is tightened with the first locking hole 223, the end of the upper seat tube head 22 having the first locking hole 223 gradually rotates close to the end of the lower seat tube head 23 having the second locking hole 232, so that the upper seat tube head 22 and the lower seat tube head 23 clamp the clip and the positioning rod on the seat cushion.

[0060] When the connecting bolt and the first locking hole 223 are loosened, the end of the upper seat tube head 22 with the first locking hole 223 gradually rotates away from the end of the lower seat tube head 23 with the second locking hole 232, so that the upper seat tube head 22 and the lower seat tube head 23 loosen the clamping piece, which has the advantages of simple structure and easy operation.

[0061] As described above, multiple implementation methods are provided in combination with specific contents, and the specific implementation of this application is not limited to these descriptions. Any similarity or similarity with the method, structure, etc. of this application, or any technical deduction or replacement made on the premise of the concept of this application, shall be deemed to be within the scope of protection of this application.

Claims

1. A bicycle seat tube that is easy to assemble, characterized in that: The invention comprises a seat tube body (1) and a seat tube head (2), wherein the seat tube head (2) is provided with a mounting hole (21), wherein a pair of first sets of plates (3) and second sets of plates (4) are arranged opposite to each other in the mounting hole (21), wherein both sides of the first sets of plates (3) are provided with first assembly grooves (31), and both sides of the second sets of plates (4) are provided with second assembly grooves (41) respectively corresponding to the first assembly grooves (31), and a positioning structure is provided between the outer side wall of the first sets of plates (3) and / or the second sets of plates (4) and the inner side wall of the mounting hole (21), wherein the positioning structure comprises first positioning concave-convex teeth (5) arranged on the outer side wall of the sets of plates and second positioning concave-convex teeth (6) arranged on the inner side wall of the mounting hole (21), wherein the first positioning concave-convex teeth (5) and the second positioning concave-convex teeth (6) are engaged with each other.

2. A bicycle seat tube that is easy to assemble according to claim 1, characterized in that: The second positioning concave-convex teeth (6) are arranged along the axial direction of the mounting hole (21), and the length dimension of the first positioning concave-convex teeth (5) is greater than the length dimension of the second positioning concave-convex teeth (6).

3. The bicycle seat tube that is easy to assemble according to claim 1, characterized in that: The number of the second positioning concave-convex teeth (6) is greater than the number of the first positioning concave-convex teeth (5).

4. The bicycle seat tube that is easy to assemble according to claim 1, characterized in that: The length dimensions of the first assembly groove (31) and the second assembly groove (41) are greater than the diameter dimension of the mounting hole (21); the first assembly groove (31) is close to or abuts against the side wall of the seat tube head (2) near the side wall of the seat tube head (2); and the second assembly groove (41) is close to or abuts against the side wall of the seat tube head (2) near the side wall of the seat tube head (2).

5. The bicycle seat tube that is easy to assemble according to claim 1, characterized in that: The seat tube head (2) comprises an upper seat tube head (22) and a lower seat tube head (23); the lower seat tube head (23) is arranged on the seat tube body (1); a rotating assembly is arranged between one end of the upper seat tube head (22) and the lower seat tube head (23); the rotating assembly can rotatably connect the upper seat tube head (22) and the lower seat tube head (23); a locking assembly is arranged between the other end of the upper seat tube head (22) and the lower seat tube head (23); the locking assembly can lock the upper seat tube head (22) on the lower seat tube head (23).

6. The bicycle seat tube that is easy to assemble according to claim 5, characterized in that: The rotating assembly comprises a rotating shaft (221) arranged on the upper tube head (22) and a rotating groove (231) arranged on the lower tube head (23); a connecting arm (222) is arranged between the rotating shaft (221) and the upper tube head (22); the width dimension of the connecting arm (222) is smaller than the diameter dimension of the rotating shaft (221); the rotating groove (231) comprises a swinging groove (2311) and a rotating shaft groove (2312) which are connected in sequence from top to bottom; the rotating shaft (221) is rotatably connected in the rotating shaft groove (2312); the connecting arm (222) is located in the swinging groove (2311); and a swinging gap is provided between the inner side wall of the swinging groove (2311) and the outer side wall of the connecting arm (222).

7. The bicycle seat tube that is easy to assemble according to claim 6, characterized in that: The connecting arm (222) is located in the middle area of ​​the end of the upper seat tube head (22).

8. The bicycle seat tube that is easy to assemble according to claim 5, characterized in that: The locking assembly comprises a first locking hole (223), a second locking hole (232) and a locking member (233); the first locking hole (223) is arranged on the upper seat tube head (22); the second locking hole (232) is arranged on the lower seat tube head (23); and the locking member (233) passes through the second locking hole (232) and is connected to the first locking hole (223).

9. The bicycle seat tube that is easy to assemble according to claim 8, characterized in that: The locking piece (233) is a connecting bolt, the first locking hole (223) is a threaded hole, and the end of the second locking hole (232) facing the seat tube body (1) is a countersunk hole capable of accommodating the head of the connecting bolt.

10. The bicycle seat tube that is easy to assemble according to claim 8, characterized in that: The first locking hole (223) is arranged on the upper seat tube head (22) in an inclined manner from bottom to top towards the mounting hole (21), and the second locking hole (232) is arranged on the lower seat tube head (23) in an inclined manner from bottom to top towards the mounting hole (21).

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