Telescopic device
By introducing a limiting structure into the telescopic device, and using limiting blocks and elastic elements to fill the gap, the problems of large sway and low connection strength between the inner and outer tubes are solved, thereby improving stability and service life.
Patent Information
- Application Number
- CN202423228096.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-26
AI Technical Summary
In existing telescopic devices, there is a gap between the inner and outer tubes, which leads to large swaying, low connection strength, and short service life.
A limiting structure is adopted, including a limiting block and an elastic element. The elastic element fills the gap between the limiting block and the inner wall of the first tube, limiting the relative position of the second tube and the first tube in the radial direction and ensuring stability.
It effectively reduces the shaking between the second and first tubes, improves the connection strength and service life, and has a simple structure that is easy to adjust and use.
Smart Images
Figure CN223653573U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of telescopic devices, in particular to a telescopic device. BACKGROUND
[0002] The telescopic device can adjust the length to meet the use of various situations, for example, the height of a child bed can be adjusted through the telescopic device. In the prior art, the telescopic device is often realized by moving an inner tube in an outer tube to adjust the total length of the two tube segments. However, during the adjustment or use, there will be a gap between the inner tube and the outer tube, and there will be a large amplitude of shaking between the inner tube and the outer tube. The connection strength between the inner tube and the outer tube is low, and the service life is low.
[0003] Therefore, it is necessary to improve the prior art. CONTENT OF THE UTILITY MODEL
[0004] The present application aims to at least solve one of the technical problems in the prior art, and provides a telescopic device.
[0005] According to an aspect of the present application, the present application provides a telescopic device, comprising a pipe assembly and a limiting structure, the pipe assembly comprising a first pipe and a second pipe, one end of the second pipe being slidably connected to the inside of the first pipe; the limiting structure being used to limit the relative position of the second pipe and the first pipe in the radial direction of the first pipe; wherein the limiting structure comprises a limiting block and an elastic piece, the elastic piece being embedded on the side of the limiting block; the limiting block being arranged on the part of the second pipe located in the first pipe, and the elastic piece being pressed between the limiting block and the inner wall of the first pipe.
[0006] In one embodiment, the elastic piece is provided at least two, and the elastic pieces are arranged in the axial direction of the first pipe.
[0007] In one embodiment, a fixing piece is further included, the fixing piece being provided with a connecting hole; the first pipe being fixed to the connecting hole through a fixing structure.
[0008] In one embodiment, the connecting hole is divided into a first hole segment and a second hole segment in the axial direction of the connecting hole, the cross-sectional area of the first hole segment being greater than that of the second hole segment; the first pipe being inserted into the first hole segment to limit the relative position of the first pipe and the first hole segment in the radial direction of the first pipe; the end of the second pipe away from the limiting block being inserted into the second hole segment to limit the relative position of the second pipe and the second hole segment in the radial direction of the second pipe.
[0009] In one embodiment, the inner wall of the second hole section comprises a first limiting surface, the outer wall of the second tube comprises a second limiting surface, the first limiting surface and the second limiting surface are oppositely arranged and cooperatively limit the rotation of the second tube in the second hole section when the second tube is inserted into the second hole section.
[0010] In one embodiment, the connection between the first hole section and the second hole section forms a third limiting surface, and the end of the first tube close to the fixing member abuts against the third limiting surface.
[0011] In one embodiment, the fixing structure comprises a fixing block, a receiving through slot and a fixing through slot, the receiving through slot is arranged in the fixing member and communicates with the connecting hole, the fixing through slot is arranged in the first tube, the receiving through slot and the fixing through slot communicate when the first tube is inserted into the connecting hole, the fixing block is positioned in the receiving through slot by a positioning structure, and the end of the fixing block extends into the fixing through slot to limit the relative position of the first tube and the fixing member.
[0012] In one embodiment, the positioning structure comprises a first through hole, a second through hole and a connecting bolt, the first through hole is arranged in the fixing member, the second through hole is arranged in the fixing block, the first through hole and the second through hole are oppositely arranged and connected by the connecting bolt when the fixing block is inserted into the fixing through slot.
[0013] In one embodiment, a locking structure is arranged between the first tube and the second tube to limit the relative position of the first tube and the second tube in the axial direction of the first tube, the locking structure comprises a first insertion hole, an insertion block and a plurality of second insertion holes, the second insertion holes are arranged in the first tube in the axial direction of the first tube, the second insertion holes are arranged in the second tube or the limiting block, the second tube is driven in the axial direction of the first tube until the first insertion hole and the second insertion hole are oppositely arranged, and the first insertion hole and the second insertion hole are connected by the insertion block.
[0014] In one embodiment, the first insertion hole is arranged in the limiting block between two adjacent elastic members.
[0015] The application has the advantages that the elastic members fill the gap between the limiting block and the inner wall of the first tube, the relative position of the limiting block and the first tube in the radial direction of the first tube is ensured, the stability of the first tube and the second tube in the radial direction of the first tube is ensured, the shaking between the second tube and the first tube is effectively reduced, the structure is simple, the applicability is strong, and the adjustment and use are convenient. BRIEF DESCRIPTION OF DRAWINGS
[0016] The technical scheme and other beneficial effects of the present application will be apparent from the following detailed description of the specific embodiments of the present application, with reference to the accompanying drawings.
[0017] Figure 1 is a structural schematic view of a pipe assembly and a fixing member provided by an embodiment of the present application.
[0018] Figure 2 is Figure 1 a bottom view.
[0019] Figure 3 is Figure 2 a sectional view at A-A in
[0020] Figure 4 is Figure 3 an enlarged view at B in
[0021] Figure 5 is Figure 3 an enlarged view at C in
[0022] Figure 6 is Figure 3 an enlarged view at D in
[0023] Figure 7 is Figure 1 another perspective three-dimensional schematic view.
[0024] Figure 8 is Figure 7 an enlarged view at E in
[0025] Figure 9 is a structural schematic view of a fixing member.
[0026] In the drawings:
[0027] 10, pipe assembly; 11, first pipe; 12, second pipe; 121, second limiting surface;
[0028] 20, limiting structure; 21, limiting block; 211, annular groove; 22, elastic member;
[0029] 30, fixing member; 31, connecting hole; 311, first hole section; 312, second hole section; 3121, first limiting surface; 313, third limiting surface;
[0030] 40, fixing structure; 41, fixing block; 42, accommodating through slot; 43, fixing through slot;
[0031] 50, positioning structure; 51, first through hole; 52, second through hole;
[0032] 60, locking structure; 61, first plug-in hole; 62, second plug-in hole;
[0033] 70. A snap projection. DETAILED DESCRIPTION
[0034] The technical solutions in the embodiments of the present application will be clearly and completely described in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.
[0035] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can be detachable connection, or integrally connected; can be mechanical connection, or electrical connection or can communicate with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0036] The telescopic device in the present application will be described in detail in connection with the drawings and specific embodiments.
[0037] In the prior art, there is a gap between the two pipes that are sleeved with each other, and there is a large amplitude of shaking between the two pipes, and the connection strength is low.
[0038] In order to solve the above technical problems, the telescopic device provided by the embodiments of the present application includes a pipe assembly and a limiting structure, the pipe assembly includes a first pipe and a second pipe, one end of the second pipe is slidably connected inside the first pipe; the limiting structure is used to limit the relative position of the second pipe and the first pipe in the radial direction of the first pipe; wherein the limiting structure includes a limiting block and an elastic member, the elastic member is embedded on the side of the limiting block; the limiting block is arranged on the part of the second pipe located in the first pipe, and the elastic member is pressed between the limiting block and the inner wall of the first pipe.
[0039] The gap between the limiting block and the inner wall of the first pipe is filled by the elastic member, which ensures the relative position of the limiting block and the first pipe in the radial direction of the first pipe, that is, the stability of the first pipe and the second pipe in the radial direction of the first pipe, effectively reduces the shaking between the second pipe and the first pipe, has simple structure, strong applicability, and convenient adjustment and use. The following will be described in detail.
[0040] Reference is made to Figure 1 , Figure 3 and Figure 4In an embodiment, the telescopic device comprises a pipe assembly 10 and a limiting structure 20, the pipe assembly 10 comprises a first pipe 11 and a second pipe 12, one end of the second pipe 12 is slidably connected inside the first pipe 11; the limiting structure 20 is used to limit the relative position of the second pipe 12 and the first pipe 11 in the radial direction of the first pipe 11; wherein the limiting structure 20 comprises a limiting block 21 and an elastic member 22, the elastic member 22 is embedded on the side of the limiting block 21; the limiting block 21 is arranged at the part of the second pipe 12 inside the first pipe 11, and the elastic member 22 is pressed between the limiting block 21 and the inner wall of the first pipe 11.
[0041] By pressing the elastic member 22 between the limiting block 21 and the inner wall of the first pipe 11, that is, the elastic member 22 fills the gap between the limiting block 21 and the inner wall of the first pipe 11, the relative position of the limiting block 21 and the first pipe 11 in the radial direction of the first pipe 11 is ensured, that is, the stability of the first pipe 11 and the second pipe 12 in the radial direction of the first pipe 11 is ensured, and the shaking between the second pipe 12 and the first pipe 11 is effectively reduced; the second pipe 12 or the first pipe 11 only needs to overcome the static friction force between the elastic member 22 and the inner wall of the first pipe 11, so as to realize the relative position of the second pipe 12 and the first pipe 11 in the axial direction of the first pipe 11, that is, to adjust the length of the pipe assembly 10 in the axial direction of the first pipe 11, so that the pipe assembly 10 can be applied to the use environment; simple structure, strong applicability, and convenient to adjust and use.
[0042] When the first pipe 11 and the second pipe 12 shake, the first pipe 11 or the second pipe 12 is subjected to an external force in the axial direction of the first pipe 11, which is easy to cause the bending of the first pipe 11 and the second pipe 12, which is not conducive to the improvement of the service life; the embodiment effectively improves the service life of the first pipe 11 and the second pipe 12, and improves the stability during use.
[0043] It should be noted that in the embodiment, the limiting block 21 is arranged at the end of the second pipe 12 inside the first pipe 11; such arrangement can reduce the use length of the second pipe 12; in some embodiments, the limiting block 21 can also be arranged at other parts of the second pipe 12 inside the first pipe 11, not limited thereto.
[0044] In an embodiment, the elastic members 22 are arranged at two positions in the axial direction of the first pipe 11, and the elastic members 22 are embedded in the circumferential side of the limiting block 21, so that the elastic members 22 can be stably connected to the limiting block 21, and the structure is simple. In some embodiments, the circumferential side of the limiting block 21 is provided with an annular groove 211, and the elastic member 22 can be an elastic ring. The relative position between the elastic member 22 and the limiting block 21 is fixed by embedding the elastic ring in the annular groove 211. When the relative position of the second pipe 12 and the first pipe 11 in the axial direction of the first pipe 11 is adjusted, the elastic ring rolls in the annular groove 211, which reduces the friction between the elastic member 22 and the inner wall of the first pipe 11, facilitates the adjustment of the length of the pipe assembly 10 (i.e., the adjustment of the relative position of the second pipe 12 and the first pipe 11 in the axial direction of the first pipe 11, and the same below), reduces the wear of the elastic member 22, and effectively prolongs the service life of the elastic member 22. At the same time, the elastic member 22 can be easily replaced after a long time of use. It should be noted that in some embodiments, the elastic member 22 can also be arranged in three equal numbers. The more the number of elastic members 22, the more stable the second pipe 12 and the first pipe 11. However, as the number of elastic members 22 increases, the total friction between the elastic member 22 and the inner wall of the first pipe 11 also increases. When the length of the pipe assembly 10 is adjusted, a larger force is required to realize the sliding of the second pipe 12 relative to the first pipe 11, which is not conducive to the adjustment operation. Therefore, the specific number of elastic members 22 is selected according to the actual use requirements, and is not limited to this.
[0045] Referring to Figure 5 , Figure 6 and Figure 9 , in an embodiment, the telescopic device further comprises a fixing member 30, and the fixing member 30 is provided with a connecting hole 31. The first pipe 11 is fixed to the connecting hole 31 through the fixing structure 40.
[0046] The first pipe 11 is inserted into the connecting hole 31, which can ensure the relative stability between the first pipe 11 and the fixing member 30. By arranging the fixing member 30 on other components, the installation position of the first pipe 11 and the second pipe 12 can be determined, which is convenient to use.
[0047] It should be noted that the other components used for the installation of the fixing member 30 are different, and the functions of the first pipe 11 and the second pipe 12 are also different. For example, the fixing member 30 is installed on the bed plate of a child bed, and can be used as a support rod for a mosquito net. The length of the pipe assembly 10 is adjusted to realize the height adjustment of the mosquito net to adapt to children of different ages. Or it can be used as a support leg of a child bed to adjust the length of the pipe assembly 10 to realize the height adjustment of the child bed. In some embodiments, it can also be used in other fields, and is not limited to this.
[0048] In some embodiments, the clamping protrusion 70 can also be arranged on the inner wall of the connecting hole 31, so as to ensure the stability of the first pipe 11 in the connecting hole 31.
[0049] Referring to Figure 6 In an embodiment, the connecting hole 31 is divided into a first hole section 311 and a second hole section 312 along the axial direction of the connecting hole 31, the cross-sectional area of the first hole section 311 is greater than that of the second hole section 312; the first pipe 11 is inserted into the first hole section 311 to define the relative position of the first pipe 11 and the first hole section 311 in the radial direction of the first pipe 11; the second pipe 12 is inserted into the second hole section 312 from the end of the second pipe 12 away from the limiting block 21 to define the relative position of the second pipe 12 and the second hole section 312 in the radial direction of the second pipe 12.
[0050] The first pipe 11 is inserted into the first hole section 311 and is radially limited by the inner wall of the first hole section 311 to prevent the first pipe 11 from shaking relative to the fixing member 30, so as to ensure the stability of the first pipe 11 after the fixing member 30 is installed, and also improve the stability of the second pipe 12; meanwhile, in the embodiment, the second pipe 12 is inserted into the second hole section 312 and is limited by the second hole section 312 to ensure the stability of the end of the second pipe 12 away from the limiting block 21, when the second pipe 12 moves relative to the first pipe 11 along the axial direction of the second pipe 12, the end of the second pipe 12 is limited by the limiting structure 20 and the other end is limited by the second hole section 312, so as to ensure that the second pipe 12 does not move relative to the first pipe 11 in the radial direction of the second pipe 12, that is, the second pipe 12 does not shake relative to the first pipe 11, thereby effectively improving the stability of the second pipe 12 and increasing the structural strength of the pipe assembly 10.
[0051] It should be noted that, in the embodiment, the first pipe 11 and the second pipe 12 are circular pipes, and in some embodiments, they can also be pipes of other forms, such as square pipes, and the like, without being limited thereto.
[0052] Referring to Figure 2 , Figure 7 and Figure 8 In an embodiment, the inner wall of the second hole section 312 includes a first limiting surface 3121, and the outer wall of the second pipe 12 includes a second limiting surface 121, when the second pipe 12 is inserted into the second hole section 312, the first limiting surface 3121 and the second limiting surface 121 are arranged opposite to each other and cooperate to limit the rotation of the second pipe 12 in the second hole section 312.
[0053] By arranging the first limiting surface 3121 and the second limiting surface 121 opposite to each other, the second pipe 12 cannot rotate in the second hole section 312, thereby further improving the stability of the second pipe 12, and the second pipe 12 can only move in the axial direction thereof to adjust the length of the pipe assembly 10, so that the structure is simple and convenient to use.
[0054] In the embodiment, the first limiting surface 3121 and the second limiting surface 121 are provided in one. In some embodiments, the first limiting surface 3121 and the second limiting surface 121 can also be provided in two, three or the like, and are not limited to this.
[0055] Referring to Figure 6 In an embodiment, the third limiting surface 313 is formed at the joint of the first hole section 311 and the second hole section 312, and the end of the first pipe 11 close to the fixing member 30 abuts against the third limiting surface 313.
[0056] The end of the first pipe 11 abuts against the third limiting surface 313, and whether the first pipe 11 is inserted in place can be determined by whether the first pipe 11 abuts against the third limiting surface 313. Such a setting can ensure that the first pipe 11 is installed in place, and facilitates the fixing operation of the fixing structure 40 on the first pipe 11.
[0057] In addition, in some embodiments, when the second pipe 12 moves along the first hole section 311 towards the second hole section 312, the force of the elastic member 22 on the inner wall of the first pipe 11 can press the first pipe 11 against the third limiting surface 313, effectively improving the stability of the first pipe 11 during the length adjustment of the pipe assembly 10.
[0058] Referring to Figure 5 and Figure 9 In an embodiment, the fixing structure 40 includes a fixing block 41, a containing through slot 42 and a fixing through slot 43. The containing through slot 42 is arranged in the fixing member 30 and communicates with the connecting hole 31. The fixing through slot 43 is arranged in the first pipe 11, and the containing through slot 42 communicates with the fixing through slot 43 when the first pipe 11 is inserted into the connecting hole 31. The fixing block 41 is positioned in the containing through slot 42 by the positioning structure 50, and the end of the fixing block 41 extends into the fixing through slot 43 to limit the relative position of the first pipe 11 and the fixing member 30.
[0059] The fixing block 41 can move in the containing through slot 42. After the fixing block 41 moves to the desired position, the fixing block 41 is positioned in the containing through slot 42 by the positioning structure 50. At this time, the end of the fixing block 41 extends into the fixing through slot 43, that is, the end of the fixing block 41 is inserted into the fixing through slot 43. Through the cooperation of the fixing block 41 and the fixing through slot 43, the position of the first pipe 11 relative to the fixing member 30 can be limited, and the stability of the first pipe 11 in the connecting hole 31 can be ensured. The first pipe 11 cannot rotate or move along the axial direction of the first pipe 11 relative to the connecting hole 31, and the structure is simple.
[0060] In some embodiments, the part of the fixing block 41 inserted into the fixing through slot 43 abuts against the second limiting surface 121, which can further ensure the stability of the second pipe 12 when moving along the axial direction thereof.
[0061] Referring to Figure 4 and Figure 9 In an embodiment, the positioning structure 50 comprises a first through hole 51, a second through hole 52, and a connecting bolt (not shown), the first through hole 51 is arranged on the fixing member 30, the second through hole 52 is arranged on the fixing block 41, when the fixing block 41 is inserted into the fixing through slot 43, the first through hole 51 and the second through hole 52 are arranged oppositely and are connected by the connecting bolt.
[0062] The first through hole 51 and the second through hole 52 are connected by the connecting bolt, the structure is simple, and the connecting operation is convenient; in actual assembly, whether the end of the fixing block 41 enters into the fixing through slot 43 can be judged by observing whether the first through hole 51 and the second through hole 52 are aligned; the installation of the fixing block 41 after assembly can be ensured, and the limitation of the fixing block 41 to the position of the first pipe 11 can be ensured.
[0063] Referring to Figure 1 , Figure 3 and Figure 4 In an embodiment, a locking structure 60 is arranged between the first pipe 11 and the second pipe 12 to limit the relative position of the first pipe 11 and the second pipe 12 in the axial direction of the first pipe 11; the locking structure 60 comprises a first insertion hole 61, an insertion block (not shown), and a plurality of second insertion holes 62, the second insertion holes 62 are arranged on the first pipe 11 in the axial direction of the first pipe 11, and the second insertion holes 62 are arranged on the limiting block 21; in some embodiments, the second insertion holes 62 can also be arranged on the second pipe 12; the second pipe 12 is driven in the axial direction of the second pipe 12 until the first insertion hole 61 and the second insertion hole 62 are opposite, and the first insertion hole 61 and the second insertion hole 62 are connected by the insertion block.
[0064] The second pipe 12 is adjusted (driven in the axial direction of the second pipe 12) so that the first insertion hole 61 and the second insertion hole 62 are opposite, the insertion block is inserted into the first insertion hole 61 and the second insertion hole 62, and the relative position between the first pipe 11 and the second pipe 12 is realized, and the structure is simple.
[0065] In some embodiments, the second pipe 12 cannot rotate relative to the connecting hole 31 under the action of the second limiting surface 121 and the first limiting surface 3121, the first insertion hole 61 and the second insertion hole 62 are arranged oppositely (the insertion block is inserted into the first insertion hole 61 and the second insertion hole 62), at this time, the first pipe 11 also cannot rotate relative to the second pipe 12, that is, the first pipe 11 cannot rotate relative to the connecting hole 31 (the first hole section 311), and such an arrangement can limit the relative arrangement of the accommodating through slot 42 and the fixing through slot 43, can facilitate the insertion of the fixing block 41 into the fixing through slot 43, and improve the assembly efficiency.
[0066] Referring to Figure 4In an embodiment, the first plug hole 61 is arranged between the limiting blocks 21 between two adjacent elastic members 22.
[0067] The first plug hole 61 is arranged between the two elastic members 22, that is, the plug-in position of the plug-in block on the second pipe 12 is defined, and the elastic members 22 on both sides can offset the shaking of the plug-in block in use, thereby ensuring the stability of the end of the second pipe 12 (the limiting block 21) and realizing the stability between the second pipe 12 and the first pipe 11.
[0068] On the other hand, the present application also relates to a children's bed comprising the telescopic device of any one of the preceding embodiments.
[0069] The technical scheme provided by the embodiments of the present application aims to fill the gap between the limiting block 21 and the inner wall of the first pipe 11 by the elastic member 22, thereby ensuring the relative position of the limiting block 21 and the first pipe 11 in the radial direction of the first pipe 11, that is, ensuring the stability of the first pipe 11 and the second pipe 12 in the radial direction of the first pipe 11, effectively reducing the shaking between the second pipe and the first pipe 11, and the structure is simple, has strong applicability, and is convenient to adjust and use.
[0070] In various embodiments of the present application, the terms or descriptions of different embodiments are consistent and can be mutually referenced if there is no special description and logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship. In the present application, "at least one" means one or more, and "multiple" means two or more.
[0071] It can be understood that the various numbers involved in the embodiments of the present application are only for convenient differentiation, and do not limit the scope of the embodiments of the present application. The size of the serial number of the above processes does not mean the execution order, and the execution order of the processes should be determined according to its function and inherent logic.
[0072] The telescopic device provided by the embodiments of the present application is described in detail above, and the principles and implementation modes of the present application are described by applying specific examples; the above embodiment description is only used to help understand the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as limiting the present application.
Claims
1. A telescoping device, characterized by, The extension device comprises a pipe assembly, a limiting structure, and a fixing structure. The pipe assembly comprises a first pipe and a second pipe, one end of the second pipe being slidably connected to the inside of the first pipe. The limiting structure is used to limit the relative position of the second pipe and the first pipe in the radial direction of the first pipe. The limiting structure comprises a limiting block and an elastic member, the elastic member being embedded in the circumferential side of the limiting block. The limiting block is arranged on the part of the second pipe located in the first pipe, and the elastic member is pressed between the limiting block and the inner wall of the first pipe.
2. The extension device according to claim 1, wherein the elastic member is arranged in the axial direction of the first pipe.
3. The extension device according to claim 1, further comprising a fixing member provided with a connecting hole, and the first pipe is fixed to the connecting hole through a fixing structure.
4. The extension device according to claim 3, wherein the connecting hole is divided into a first hole section and a second hole section in the axial direction of the connecting hole, and the cross-sectional area of the first hole section is larger than that of the second hole section. The first pipe is inserted into the first hole section to limit the relative position of the first pipe and the first hole section in the radial direction of the first pipe, and the end of the second pipe away from the limiting block is inserted into the second hole section to limit the relative position of the second pipe and the second hole section in the radial direction of the second pipe.
5. The extension device according to claim 4, wherein the inner wall of the second hole section comprises a first limiting surface, and the outer wall of the second pipe comprises a second limiting surface, the first limiting surface and the second limiting surface being oppositely arranged and cooperatively limiting the rotation of the second pipe in the second hole section when the second pipe is inserted into the second hole section.
6. The extension device according to claim 4, wherein the connection between the first hole section and the second hole section forms a third limiting surface, and the end of the first pipe close to the fixing member abuts against the third limiting surface.
7. The extension device according to claim 3, wherein the fixing structure comprises a fixing block, a receiving slot, and a fixing slot, the receiving slot is arranged in the fixing member and communicates with the connecting hole, and the fixing slot is arranged in the first pipe, the receiving slot and the fixing slot being communicated when the first pipe is inserted into the connecting hole. The end of the fixing block extends into the fixing slot through a positioning structure to limit the relative position of the first pipe and the fixing member.
8. The extension device according to claim 7, wherein the positioning structure comprises a first through hole, a second through hole, and a connecting bolt, the first through hole is arranged in the fixing member, and the second through hole is arranged in the fixing block, the first through hole and the second through hole being oppositely arranged and connecting the first through hole and the second through hole through the connecting bolt when the fixing block is inserted into the fixing slot.
9. The extension device according to claim 1, A locking structure is arranged between the first pipe and the second pipe to define the relative position of the first pipe and the second pipe in the axial direction of the first pipe; The locking structure comprises a first insertion hole, an insertion block, and a plurality of second insertion holes arranged in the axial direction of the first pipe, the second insertion holes being arranged on the second pipe or the limiting block; The second pipe is driven in the axial direction of the first pipe until the first insertion hole and the second insertion hole are opposite, and the first insertion hole and the second insertion hole are connected by the insertion block.
10. The telescopic device of claim 9, wherein The first insertion hole is arranged on the limiting block between two adjacent elastic members.