Connecting structure of rod piece and connecting structure of pipe

Abstract

The utility model relates to the technical field of mechanical structures, and discloses a connecting structure of a rod piece and a connecting structure of a pipe, the connecting structure of the rod piece comprises a connecting main body, an expansion head and a locking piece, and the connecting main body comprises a main body part and a reducer pipe located at the side part of the main body part; the expansion head is movably arranged in the reducer pipe and can move in the direction close to the main body part so as to increase the diameter of the reducer pipe; the locking piece is movably arranged on the main body part, and a transmission rope is arranged between the expansion head and the locking piece. By controlling the locking piece to move relative to the main body part, the transmission rope can be pulled to drive the expansion head to move in the direction close to the main body part, so that the diameter of the reducer pipe can be increased to be expanded in the rod piece, connection of the rod piece can be achieved without the help of an external tool, and high efficiency and convenience are achieved. In addition, the transmission rope is adopted as a transmission structure to retract and pull the expansion head, the structure is simple, cost is low, and the transmission rope has certain flexibility, saves space and is convenient to retract and release.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical structures, specifically to the connection structure of rods and the connection structure of pipes. Background Art

[0002] Existing rods that are sleeved with each other or telescopic usually adopt screw connections, which not only have a relatively complex structure, but also require external tools for disassembly and installation, which is very inconvenient. Summary of the Utility Model

[0003] In view of this, the utility model provides a connection structure of rods and a connection structure of pipes to solve the problems of the existing rod connection structure being relatively complex in structure and requiring external tools for disassembly and installation, which is very inconvenient.

[0004] In the first aspect, the utility model provides a connection structure of rods, including:

[0005] A connection main body, including a main body part and a reduced-diameter pipe located on the side of the main body part;

[0006] An expansion head, movably arranged in the reduced-diameter pipe, and the expansion head can move towards the direction close to the main body part to increase the diameter of the reduced-diameter pipe;

[0007] A locking member, movably arranged on the main body part, a transmission cable is arranged between the expansion head and the locking member, and the locking member moves relative to the main body part to pull the end of the transmission cable towards the direction close to the main body part, thereby driving the expansion head to move in the same direction.

[0008] Beneficial effects: The expansion head is movably arranged in the reduced-diameter pipe, the transmission cable is arranged between the expansion head and the locking member, the rod is sleeved outside the reduced-diameter pipe. By controlling the movement of the locking member relative to the main body part, the transmission cable can be pulled to drive the expansion head to move towards the direction close to the main body part, so that the diameter of the reduced-diameter pipe can be increased to expand and tighten in the rod, and the connection of the rod can be realized without using external tools, which is very efficient and convenient, and effectively solves the problems of the existing rod connection structure being relatively complex in structure and requiring external tools for disassembly and installation, which is very inconvenient. In addition, the present application uses a transmission cable as the transmission structure to pull and retract the expansion head, which has a simple structure, low cost, and the transmission cable has a certain flexibility, saves space, is convenient for winding and unwinding, so that the expansion head is close to the main body part, thereby enabling the outer diameter of the reduced-diameter pipe to be further increased and improving the fixing effect between the reduced-diameter pipe and the rod.

[0009] In an optional implementation manner, the locking member is rotatably arranged on the main body part, and when the locking member rotates, it drives part of the transmission cable to wind around the locking member to pull the end of the transmission cable towards the direction close to the main body part.

[0010] Beneficial effects: The locking member is rotatably arranged inside the main body part. When the locking member is driven to rotate, it can wind part of the transmission cable, shortening the length of the transmission cable, thereby pulling the expansion head connected to the end of the transmission cable to move towards the main body part, increasing the outer diameter of the variable-diameter pipe, and thus realizing the connection and fixation of the rod and the variable-diameter pipe.

[0011] In an alternative embodiment, a one-way locking mechanism is provided between the locking member and the main body part, and the one-way locking mechanism is used to restrict the reverse rotation of the locking member;

[0012] When the locking member rotates forward, it drives part of the transmission cable to wind around the locking member. When the locking member rotates backward, the transmission cable wound on its surface can be disengaged.

[0013] Beneficial effects: By providing the one-way locking mechanism between the locking member and the main body part, the reverse rotation of the locking member can be effectively restricted, avoiding the disengagement of the transmission cable wound on its surface due to the reverse rotation of the locking member, affecting the fixing effect of the rod, and further improving the stability and reliability of the rod connection.

[0014] In an alternative embodiment, the one-way locking mechanism includes a limiting tooth groove and an elastic ratchet tooth. One of the limiting tooth groove and the elastic ratchet tooth is arranged on the main body part, and the other is arranged on the locking member. The elastic ratchet tooth cooperates with the limiting tooth groove to restrict the reverse rotation of the locking member.

[0015] Beneficial effects: The one-way locking mechanism adopts the structural form of a limiting tooth groove and an elastic ratchet tooth, with a simple structure and good limiting effect.

[0016] In an alternative embodiment, the one-way locking mechanism has a locked state and an unlocked state;

[0017] When the one-way locking mechanism is in the locked state, the elastic ratchet tooth meshes with the limiting tooth groove to restrict the reverse rotation of the locking member; when the one-way locking mechanism is in the unlocked state, the elastic ratchet tooth is separated from the limiting tooth groove, and the locking member can rotate reversely.

[0018] Beneficial effects: When the one-way locking mechanism is in the locked state, the elastic ratchet tooth meshes with the limiting tooth groove, which can restrict the reverse rotation of the locking member, keeping the rod and the variable-diameter pipe in a stable connection state. When the one-way locking mechanism is in the unlocked state, the elastic ratchet tooth is separated from the limiting tooth groove, and the locking member can rotate reversely, thereby being able to release the expansion head and facilitating the disassembly of the rod and the variable-diameter pipe.

[0019] In an alternative embodiment, the locking member can move in a direction perpendicular to the moving direction of the expansion head. The locking member has a first position and a second position. When the locking member is in the first position, the one-way locking mechanism is in the locked state; when the locking member is in the second position, the one-way locking mechanism is in the unlocked state.

[0020] Beneficial effects: By manipulating the locking member to move between the first position and the second position, it is possible to control the switching of the one-way locking mechanism between the locked state and the unlocked state, enabling the engagement or separation of the elastic ratchet teeth and the limiting tooth grooves, which is very convenient and fast.

[0021] In an alternative embodiment, when the locking member is in the first position, the locking member is located within the main body portion, and the elastic ratchet teeth are engaged with the limiting tooth grooves to restrict the reverse rotation of the locking member.

[0022] When the locking member is in the second position, at least a part of the locking member extends out of the main body portion, the elastic ratchet teeth are separated from the limiting tooth grooves, and the locking member can rotate in the reverse direction.

[0023] Beneficial effects: By controlling the locking member to extend or retract into the main body portion, it is possible to control the engagement or separation of the elastic ratchet teeth and the limiting tooth grooves, and the operation is relatively convenient.

[0024] In an alternative embodiment, an installation cavity is provided in the main body portion in a direction perpendicular to the moving direction of the expansion head, and the locking member is slidably arranged in the installation cavity.

[0025] Beneficial effects: The extending direction of the installation cavity is perpendicular to the axial direction of the variable-diameter pipe, and the locking member is slidably arranged in the installation cavity, which is convenient for switching between the first position and the second position.

[0026] In an alternative embodiment, a limiting boss for restricting the displacement of the locking member is provided in the installation cavity. When the locking member is in the first position, the locking member abuts against the limiting boss to prevent the locking member from disengaging from the installation cavity.

[0027] Beneficial effects: Both the upper and lower ends of the installation cavity are provided with openings. Through the limiting boss provided in the installation cavity, when the locking member extends into the main body portion from the opening at one end of the installation cavity to the first position, the limiting boss can abut against the locking member, thereby preventing the locking member from disengaging from the opening at the other end of the main body portion.

[0028] In an alternative embodiment, the locking member is slidably arranged on the main body portion, and when the locking member slides, it pulls the end of the transmission cable to move towards the direction close to the main body portion.

[0029] Beneficial effects: The locking member is slidably arranged within the main body portion. When the locking member is driven to slide within the main body portion, it can make the end of the transmission cable move towards the direction close to the main body portion, thereby pulling the expansion head connected to the end of the transmission cable to move towards the direction close to the main body portion, increasing the outer diameter of the variable-diameter pipe, and realizing the connection and fixation of the rod member and the variable-diameter pipe.

[0030] In an alternative embodiment, the locking member slides in a direction perpendicular to the moving direction of the expansion head. When the locking member slides, the transmission cable drives the expansion head to move towards the direction close to the main body portion to increase the diameter of the variable-diameter pipe.

[0031] Beneficial effect: The locking member slides in a direction perpendicular to the axial direction of the variable-diameter pipe. The transmission cable is connected between the locking member and the expansion head. When the locking member is driven to slide in a direction perpendicular to the moving direction of the expansion head, the transmission cable will pull the expansion head to move towards the main body part, so that the outer diameter of the variable-diameter pipe increases, and it is tightened and fixed in the rod member.

[0032] In an alternative embodiment, a screwing part is provided at the end of the locking member, and the screwing part is used to drive the locking member to rotate.

[0033] Beneficial effect: By providing the screwing part at the end of the locking member, it is convenient for the user to manually rotate the locking member.

[0034] In an alternative embodiment, the connection structure further includes:

[0035] An end cap, which is detachably mounted on the locking member or the main body part, and the end cap is located outside the end of the locking member.

[0036] Beneficial effect: By providing the end cap outside the end of the locking member, the locking member can be blocked, which can not only play a role in dust prevention, preventing dust and other sundries from falling into the main body part or the screwing groove, but also play a role in decorative occlusion, so that the user cannot see the locking member and other structures inside the main body part from the outside, improving the aesthetics.

[0037] In an alternative embodiment, an inclined surface is provided on the outer wall of the expansion head. When the expansion head moves, the inclined surface on the outer wall of the expansion head squeezes the inner wall of the variable-diameter pipe to increase the diameter of the variable-diameter pipe.

[0038] Beneficial effect: By providing the inclined surface on the outer wall of the expansion head, when the expansion head moves towards the main body part under the pull of the transmission cable, the inclined surface on the outer wall of the expansion head can squeeze the inclined surface on the inner wall of the variable-diameter pipe, so that the outer diameter of the variable-diameter pipe increases, and the inclined surface can also play a guiding role.

[0039] In an alternative embodiment, an inclined surface is provided on the inner wall of the variable-diameter pipe, and the expansion head moves to squeeze the inclined surface on the inner wall of the variable-diameter pipe to increase the diameter of the variable-diameter pipe.

[0040] Beneficial effect: By providing the inclined surface on the inner wall of the variable-diameter pipe, when the expansion head moves towards the main body part under the pull of the transmission cable, it can squeeze the inclined surface on the inner wall of the variable-diameter pipe, so that the outer diameter of the variable-diameter pipe increases, and the inclined surface can also play a guiding role.

[0041] In a second aspect, the present invention further provides a connection structure for pipes, which at least includes a first pipe body and a second pipe body, and further includes a connection main body and a locking member;

[0042] The connecting body includes a main body and two reducers arranged on the side of the main body; the two reducers are respectively plugged into the first tube body and the second tube body;

[0043] An expansion head is provided in the reducer, and when the expansion head moves toward the main body, the diameter of the reducer is increased to fix the reducer and the first tube body or the second tube body;

[0044] The locking piece is movably arranged on the main body, and the expansion heads in the two reducers are connected through a transmission device. When the locking piece moves relative to the main body, it drives the transmission device to operate or move, and then drives the expansion head to move toward the main body.

[0045] Beneficial effects: The two reducers located on the side of the main body are respectively inserted into the first tube body and the second tube body, the expansion head has a second end and a first end, the outer diameter of the second end is larger than the outer diameter of the first end, and the second end is located at an end away from the main body, the first ends of the two expansion heads respectively extend into the reducer from the two ends of the two reducers and are connected through a transmission device, when the locking piece moves relative to the main body, it drives the transmission device to operate or move, thereby driving the expansion head to move in the direction close to the main body, the two expansion heads are further squeezed into the reducer, so that the reducer is further tightened, forming a tight fit with the first tube body and the second tube body, thereby realizing the connection and fixation of the first tube body and the second tube body.

[0046] In an optional embodiment, the locking member is rotatably provided on the main body, and when the locking member rotates, it drives the transmission device to move, so that the expansion head moves in a direction close to the main body.

[0047] In an optional embodiment, the transmission device includes a transmission cable, which connects the two expansion heads. The locking member moves to move the expansion head toward the main body.

[0048] Beneficial Effects: The transmission cable is connected to two expansion heads at each end, with a locking member interposed in the middle. When the locking member rotates or slides within the main body, it drives the expansion heads toward the main body, thereby increasing the outer diameter of the reducer and tightening it within the first and second tubes, thereby achieving a secure connection between the first and second tubes. By employing a transmission cable structure, the transmission device not only has a simple structure and low cost, but also occupies little space and is highly flexible, allowing for easy bending.

[0049] In an optional embodiment, the locking member is rotatably provided on the main body, and when the locking member rotates, it drives the transmission rope to partially wrap around the locking member, so that the expansion head moves toward the main body to increase the diameter of the reducer.

[0050] In an alternative embodiment, a notch is provided in the middle of the locking member. One end of the transmission cable is connected to an expansion head, and the other end passes through the notch and is connected to another expansion head. When the locking member rotates, it drives the transmission cable to partially wind around the locking member, thereby simultaneously moving the two expansion heads towards the main body portion to increase the diameter of the variable-diameter tube.

[0051] Advantageous effects: Through the notch provided in the middle of the locking member, the transmission cable is threaded through the notch. In this way, when the locking member rotates, it can wind and tighten the transmission cable, causing the two expansion heads at both ends of the transmission cable to move towards the main body portion, thereby increasing the outer diameters of the two variable-diameter tubes to achieve the connection of the first pipe body and the second pipe body.

[0052] In an alternative embodiment, the transmission device includes:

[0053] A rotating member and a transmission rod; the rotating member is provided on the locking member; one end of the transmission rod is in transmission cooperation with the rotating member, and the other end is fixedly connected to the expansion head;

[0054] The rotation of the locking member drives the rotation of the rotating member, thereby causing the transmission rod to drive the expansion head to move towards the main body portion.

[0055] Advantageous effects: The transmission device adopts a rotating member and a transmission rod in transmission cooperation. When the locking member rotates, it can drive the rotation of the rotating member, and when the rotating member rotates, it can drive the movement of the transmission rod, thereby causing the expansion head connected to the end of the transmission rod to move towards the main body portion, and further increasing the outer diameter of the variable-diameter tube to achieve the connection and fixation of the first pipe body and the second pipe body.

[0056] In an alternative embodiment, the rotating member is a transmission gear fixedly connected to one end of the locking member, and a rack meshing with the transmission gear is provided at one end of the transmission rod facing the transmission gear;

[0057] The relative rotation of the locking member with respect to the main body portion causes the transmission gear to rotate, so as to drive the transmission rod to move towards each other, and at the same time cause the expansion head to move towards the main body portion to increase the diameter of the variable-diameter tube.

[0058] Advantageous effects: The rotating member adopts a transmission gear fixedly provided at one end of the locking member, and the transmission rod adopts a rack meshing with the transmission gear for transmission, which has the advantages of simple structure, stable, precise and efficient transmission.

[0059] In an alternative embodiment, the locking member is slidably provided on the main body portion, and when the locking member slides, it pulls the transmission device to move towards the main body portion.

[0060] Beneficial effects: The locking member is slidably disposed within the main body portion. When the locking member is driven to slide within the main body portion, the end of the transmission cable can be moved in a direction closer to the main body portion, thereby pulling the expansion head connected to the end of the transmission cable in a direction closer to the main body portion, increasing the outer diameter of the variable-diameter tube. The two variable-diameter tubes are respectively tightened within the first tube body and the second tube body, thereby realizing the connection and fixation of the first tube body and the second tube body.

[0061] In an alternative embodiment, the transmission device includes a transmission cable that is respectively connected to the two expansion heads, and the locking member slides to move the two expansion heads simultaneously in a direction closer to the main body portion.

[0062] Beneficial effects: By using a transmission cable to contract the two expansion heads, the structure is simple, the cost is low, space is saved, and the transmission cable has a certain flexibility, saving space and facilitating winding and unwinding, enabling the expansion head to closely abut against the main body portion, thereby further increasing the outer diameter of the variable-diameter tube and improving the fixing effect between the variable-diameter tube and the first tube body and the second tube body.

[0063] In an alternative embodiment, the locking member slides in a direction perpendicular to the moving direction of the expansion head. When the locking member slides, the transmission cable drives the expansion head to move in a direction closer to the main body portion to increase the diameter of the variable-diameter tube.

[0064] Beneficial effects: The locking member slides in a direction perpendicular to the axial direction of the variable-diameter tube. The transmission cable is connected between the locking member and the expansion head. When the locking member is driven to slide in a direction perpendicular to the moving direction of the expansion head, the transmission cable will pull the expansion head in a direction closer to the main body portion, thereby increasing the outer diameters of the two variable-diameter tubes, causing the two variable-diameter tubes to be tightened and fixed within the first tube body and the second tube body, and realizing the connection of the two tube bodies.

[0065] In an alternative embodiment, a one-way locking mechanism is provided between the locking member and the main body portion, and the one-way locking mechanism is used to restrict the reverse rotation of the locking member;

[0066] When the locking member rotates forward, it drives the transmission cable to partially wind around the locking member, and when the locking member rotates in the reverse direction, the transmission cable wound around its surface can be disengaged.

[0067] Beneficial effects: By providing a one-way locking mechanism between the locking member and the main body portion, the reverse rotation of the locking member can be effectively restricted, preventing the transmission cable wound around its surface from disengaging due to the reverse rotation of the locking member, which affects the fixing effect between the two tube bodies and the variable-diameter tube, and further improving the stability and reliability of the connection between the first tube body and the second tube body.

[0068] In an alternative embodiment, the one-way locking mechanism includes a limiting tooth groove and an elastic ratchet tooth. One of the limiting tooth groove and the elastic ratchet tooth is provided on the main body portion, and the other is provided on the locking member. The elastic ratchet tooth cooperates with the limiting tooth groove to restrict the reverse rotation of the locking member.

[0069] In an alternative embodiment, the one-way locking mechanism has a locked state and an unlocked state. When the one-way locking mechanism is in the locked state, the elastic ratchet engages with the limit tooth groove to restrict the reverse rotation of the locking member; when the one-way locking mechanism is in the unlocked state, the elastic ratchet is separated from the limit tooth groove, and the locking member can rotate reversely.

[0070] In an alternative embodiment, the locking member can move in a direction perpendicular to the moving direction of the expansion head. The locking member has a first position and a second position. When the locking member is in the first position, the one-way locking mechanism is in the locked state; when the locking member is in the second position, the one-way locking mechanism is in the unlocked state.

[0071] In an alternative embodiment, when the locking member is in the first position, the locking member is located within the main body portion, and the elastic ratchet engages with the limit tooth groove to restrict the reverse rotation of the locking member;

[0072] When the locking member is in the second position, at least a part of the locking member extends out of the main body portion, the elastic ratchet is separated from the limit tooth groove, and the locking member can rotate reversely.

[0073] In an alternative embodiment, an installation cavity is provided in the main body portion in a direction perpendicular to the moving direction of the expansion head, and the locking member is slidably arranged in the installation cavity.

[0074] In an alternative embodiment, the installation cavity is provided with a limit boss for restricting the displacement of the locking member. When the locking member is in the first position, the locking member abuts against the limit boss to prevent the locking member from disengaging from the installation cavity.

[0075] In an alternative embodiment, the connection structure further includes:

[0076] An end cap, which is detachably installed on the locking member or the main body portion, and the end cap is located outside the end portion of the locking member.

[0077] In an alternative embodiment, the expansion head includes a first end close to the main body portion and a second end far from the main body portion, and the outer diameter of the second end is larger than the outer diameter of the first end.

[0078] Beneficial effects: The outer diameter of the second end of the expansion head far from the main body portion is larger than the outer diameter of the first end close to the main body portion. Thus, when the transmission cable is tightened, the two expansion heads located at both ends thereof can be driven to move towards the direction close to the main body portion, squeezing the variable-diameter tube, so that the diameter of the variable-diameter tube increases, thereby realizing the expansion and tightening of the two variable-diameter tubes and the two pipe bodies, and further realizing the connection of the first pipe body and the second pipe body.

[0079] In an alternative embodiment, a screwing portion is provided at the end of the locking member, and the screwing portion is used to drive the locking member to rotate under drive.

[0080] In an alternative embodiment, there are two expansion heads, and the two expansion heads are symmetrically arranged relative to the locking member. When the locking member moves, it drives the two expansion heads to move simultaneously towards the direction close to the main body part, thereby increasing the diameters of the two variable-diameter tubes to achieve the connection between the first pipe body and the second pipe body.

[0081] Beneficial effects: With the two expansion heads symmetrically arranged relative to the locking member, when the locking member moves, it can drive the two expansion heads to move synchronously, enabling the two variable-diameter tubes and the two pipe bodies to be tightened and fixed synchronously, with a better fixing effect, and avoiding the phenomenon that one side of the variable-diameter tube and the pipe body are already firmly fixed while the other side of the variable-diameter tube and the pipe body are still relatively loose. Description of the Drawings

[0082] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0083] Figure 1 It is a schematic diagram of the connection structure after being connected to the first pipe body and the second pipe body in the embodiment of the present invention;

[0084] Figure 2 It is a partial cross-sectional view of the connection structure after being connected to the first pipe body and the second pipe body in the embodiment of the present invention;

[0085] Figure 3 It is a schematic diagram of the connection structure in the embodiment of the present invention;

[0086] Figure 4 It is Figure 3 a cross-sectional view of;

[0087] Figure 5 It is a schematic diagram of the cooperation between the connection main body and the locking member at the first position in the embodiment of the present invention;

[0088] Figure 6 It is a schematic diagram of the locking member in the embodiment of the present invention;

[0089] Figure 7 It is a schematic diagram of the connection main body in the embodiment of the present invention;

[0090] Figure 8 It is a schematic diagram of the cooperation between the expansion head, the locking member, the end cover, and the transmission cable in the embodiment of the present invention.

[0091] Description of the Reference Numerals:

[0092] 10. Connection structure

[0093] 11. Connection body; 111. Main body part; 1110. Through hole; 1111. Limit tooth groove; 1112. Limit boss; 112. Reducing pipe; 1120. Deformation opening; 1121. Anti-slip rib

[0094] 12. Expansion head

[0095] 13. Locking part; 130. Notch; 131. Elastic ratchet tooth; 132. Screwing groove; 133. Step limit part; 1331. Extended section; 1332. Abutting boss

[0096] 14. End cap

[0097] 15. Transmission cable

[0098] 20. First pipe body; 30. Second pipe body Detailed implementation manner

[0099] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model

[0100] The following combines Figures 1 to 8 , and describes the embodiments of the present utility model

[0101] According to an embodiment of the present utility model, on the one hand, the present utility model provides a connection structure 10 for a rod, including: a connection body 11, an expansion head 12, and a locking part 13. The connection body 11 includes a main body part 111 and a reducing pipe 112 located on the side of the main body part 111. The expansion head 12 is movably arranged in the reducing pipe 112, and the expansion head 12 can move in a direction close to the main body part 111 to increase the diameter of the reducing pipe 112. The locking part 13 is movably arranged on the main body part 111. A transmission cable 15 is arranged between the expansion head 12 and the locking part 13. The locking part 13 moves relative to the main body part 111 to pull the end of the transmission cable 15 to move in a direction close to the main body part 111, thereby driving the expansion head 12 to move in the same direction

[0102] In the above embodiments, the expansion head 12 is movably arranged in the variable-diameter pipe 112, the transmission cable 15 is arranged between the expansion head 12 and the locking member 13, the rod member is sleeved outside the variable-diameter pipe 112, and by controlling the movement of the locking member 13 relative to the main body portion 111, the transmission cable 15 can be pulled to drive the expansion head 12 to move towards the main body portion 111, so that the diameter of the variable-diameter pipe 112 can be increased and tightened in the rod member, and the connection of the rod member can be realized without the aid of external tools, which is very efficient and convenient, effectively solving the problem that the structure of the rod connection structure 10 in the prior art is relatively complex and external tools are required for disassembly and installation, which is very inconvenient. In addition, the present application uses the transmission cable 15 as the transmission structure to pull and retract the expansion head 12, with a simple structure, low cost, and the transmission cable 15 has a certain flexibility, saving space, being convenient for winding and unwinding, enabling the expansion head 12 to closely adjoin the main body portion 111, so that the outer diameter of the variable-diameter pipe 112 can be further increased, improving the fixing effect between the variable-diameter pipe 112 and the rod member.

[0103] Specifically, the transmission cable 15 includes, but is not limited to, flexible members such as steel wires, ropes, chains, ribbons, and cloth strips. The main body portion 111 and the variable-diameter pipe 112 can be integrally formed. The rod member is sleeved outside the variable-diameter pipe 112. The expansion head 12 can move along the axial direction of the variable-diameter pipe 112. The expansion head 12 has a first end close to the main body portion 111 and a second end far from the main body portion 111. The outer diameter of the expansion head 12 gradually increases from the first end to the second end. It is set that the inner diameter of the variable-diameter pipe 112 under normal conditions is d0, the outer diameter of the first end of the expansion head 12 is d1, and the outer diameter of the second end is d2, where d1 < d0 < d2. Thus, when the expansion head 12 moves towards the main body portion 111 under the pull of the transmission cable 15, the diameter of the variable-diameter pipe 112 can be enlarged, enabling the variable-diameter pipe 112 to be tightened in the rod member, realizing the connection between the connection structure 10 and the variable-diameter pipe 112.

[0104] In the embodiments of the present application, the locking member 13 is rotatably arranged on the main body portion 111 or slidably arranged on the main body portion 111. By controlling the rotation or sliding of the locking member 13 in the main body portion 111, the transmission cable 15 can be driven to drive the expansion head 12 to move towards the main body portion 111, realizing the connection and fixation between the variable-diameter pipe 112 and the rod member.

[0105] In the first embodiment of the present application, the locking member 13 is rotatably arranged on the main body portion 111. When the locking member 13 rotates, it drives part of the transmission cable 15 to wind around the locking member 13 to pull the end of the transmission cable 15 to move towards the main body portion 111.

[0106] In the above embodiment, the locking member 13 is rotatably arranged in the main body portion 111. When the locking member 13 is driven to rotate, it can wind part of the transmission cable 15, so that the length of the transmission cable 15 is shortened, thereby pulling the expansion head 12 connected to the end of the transmission cable 15 to move towards the main body portion 111, increasing the outer diameter of the variable-diameter pipe 112, and thus realizing the connection and fixation of the rod member and the variable-diameter pipe 112.

[0107] Specifically, an installation cavity is arranged in the main body portion 111. The locking member 13 is rotatably arranged in this installation cavity. When the locking member 13 is driven by an external force, it can rotate inside the main body portion 111. When the locking member 13 rotates, it will wind and tighten the transmission cable 15, so that the length of the transmission cable 15 is shortened, thereby pulling the expansion head 12 to move towards the main body portion 111 to increase the diameter of the variable-diameter pipe 112, so that the variable-diameter pipe 112 is tightened and fixed in the rod member.

[0108] Further, in some embodiments, a one-way locking mechanism is arranged between the locking member 13 and the main body portion 111. The one-way locking mechanism is used to limit the reverse rotation of the locking member 13; when the locking member 13 rotates forward, it drives part of the transmission cable 15 to wind around the locking member 13, and when the locking member 13 rotates reversely, the transmission cable 15 wound on its surface can be disengaged.

[0109] In the above embodiment, by arranging the one-way locking mechanism between the locking member 13 and the main body portion 111, the reverse rotation of the locking member 13 can be effectively restricted, avoiding the disengagement of the transmission cable 15 wound on its surface due to the reverse rotation of the locking member 13, affecting the fixing effect of the rod member, and further improving the stability and reliability of the connection of the rod member.

[0110] Further, in some embodiments, the one-way locking mechanism includes a limit tooth groove 1111 and an elastic ratchet tooth 131. One of the limit tooth groove 1111 and the elastic ratchet tooth 131 is arranged on the main body portion 111, and the other is arranged on the locking member 13. The elastic ratchet tooth 131 cooperates with the limit tooth groove 1111 to limit the reverse rotation of the locking member 13.

[0111] In the above embodiment, the one-way locking mechanism adopts the structural form of the limit tooth groove 1111 and the elastic ratchet tooth 131, with a simple structure and good limiting effect.

[0112] In one example, the elastic ratchet teeth 131 are provided on the locking member 13, and the limiting tooth grooves 1111 are provided on the main body portion 111. The locking member 13 has a columnar main body. There are multiple elastic ratchet teeth 131, and the multiple elastic ratchet teeth 131 are arranged at intervals along the circumferential direction of the columnar main body, and the multiple elastic ratchet teeth 131 all incline in the clockwise direction or the counterclockwise direction. The number of the limiting tooth grooves 1111 is twice the number of the elastic ratchet teeth 131, and the elastic ratchet teeth 131 are alternately inserted and engaged in the limiting tooth grooves 1111. In the drawings of this embodiment, it is shown in the form that the multiple elastic ratchet teeth 131 all incline in the counterclockwise direction, the number of the elastic ratchet teeth 131 is three, and the number of the limiting tooth grooves 1111 is six.

[0113] Further, in some embodiments, the one-way locking mechanism has a locking state and an unlocking state; when the one-way locking mechanism is in the locking state, the elastic ratchet teeth 131 are engaged with the limiting tooth grooves 1111 to restrict the reverse rotation of the locking member 13; when the one-way locking mechanism is in the unlocking state, the elastic ratchet teeth 131 are separated from the limiting tooth grooves 1111, and the locking member 13 can rotate reversely.

[0114] In the above embodiment, when the one-way locking mechanism is in the locking state, the elastic ratchet teeth 131 are engaged with the limiting tooth grooves 1111, which can restrict the reverse rotation of the locking member 13, so that the rod member and the reduced-diameter pipe 112 maintain a stable connection state. When the one-way locking mechanism is in the unlocking state, the elastic ratchet teeth 131 are separated from the limiting tooth grooves 1111, and the locking member 13 can rotate reversely, so that the expansion head 12 can be released, facilitating the disassembly of the rod member and the reduced-diameter pipe 112.

[0115] Further, in some embodiments, the locking member 13 can move in a direction perpendicular to the moving direction of the expansion head 12. The locking member 13 has a first position and a second position. When the locking member 13 is in the first position, the one-way locking mechanism is in the locking state; when the locking member 13 is in the second position, the one-way locking mechanism is in the unlocking state.

[0116] In the above embodiment, by controlling the locking member 13 to move between the first position and the second position, the switching of the one-way locking mechanism between the locking state and the unlocking state can be realized, so that the elastic ratchet teeth 131 are engaged with or separated from the limiting tooth grooves 1111, which is very convenient and fast.

[0117] Specifically, a cylindrical installation cavity is provided in the main body portion 111. The columnar main body of the locking member 13 is located in the cylindrical installation cavity, and the two are coaxially arranged. The locking member 13 can move along the axial direction of the cylindrical installation cavity to switch between the first position and the second position. The reduced-diameter pipe 112 is fixedly arranged on the side of the main body portion 111. The axial direction of the reduced-diameter pipe 112 is perpendicular to the axial direction of the cylindrical installation cavity. A through hole 1110 through which the transmission cable 15 can pass is provided on the side wall of the main body portion 111.

[0118] Further, in some embodiments, when the locking member 13 is in the first position, the locking member 13 is located within the main body portion 111, and the elastic ratchet teeth 131 are engaged with the limiting tooth grooves 1111 to restrict the reverse rotation of the locking member 13; when the locking member 13 is in the second position, at least a part of the locking member 13 extends out of the main body portion 111, and the elastic ratchet teeth 131 and the limiting tooth grooves 1111 are offset in the axial direction of the installation cavity to achieve separation, and at this time the locking member 13 can rotate reversely.

[0119] In the above embodiments, by controlling the locking member 13 to extend or retract into the main body portion 111, the engagement or separation of the elastic ratchet teeth 131 and the limiting tooth grooves 1111 can be achieved, and the operation is relatively convenient.

[0120] Specifically, at least one end of the cylindrical installation cavity is open, and the locking member 13 can extend into or out of the main body portion 111 from this opening. Preferably, in this embodiment, both ends of the cylindrical installation cavity are open, and the user can push the locking member 13 from one opening so that it extends out from the other opening, and the operation is more convenient.

[0121] Further, in some embodiments, an installation cavity is provided in the main body portion 111 in a direction perpendicular to the moving direction of the expansion head 12, and the locking member 13 is slidably arranged in the installation cavity.

[0122] In the above embodiments, the extending direction of the installation cavity is perpendicular to the axial direction of the variable diameter pipe 112, and the locking member 13 is slidably arranged in this installation cavity, which is convenient for switching between the first position and the second position.

[0123] Further, in some embodiments, a limiting boss 1112 for restricting the displacement of the locking member 13 is provided in the installation cavity. When the locking member 13 is in the first position, the locking member 13 abuts against the limiting boss 1112 to prevent the locking member 13 from coming out of the installation cavity.

[0124] In the above embodiments, openings are provided at both the upper and lower ends of the installation cavity. Through the limiting boss 1112 provided in the installation cavity, when the locking member 13 extends into the main body portion 111 from the opening at one end of the installation cavity to the first position, the limiting boss 1112 can abut against the locking member 13, thereby preventing the locking member 13 from coming out of the opening at the other end of the main body portion 111.

[0125] Specifically, the installation cavity is cylindrical. One end thereof is an open end through which the locking member 13 can extend in and out, and the other end is a closed end provided with a limiting boss 1112. The limiting boss 1112 is annular and fixedly arranged on the inner circumference of the installation cavity. A stepped limiting portion 133 is arranged at one end of the columnar main body of the locking member 13 close to the limiting boss 1112. The stepped limiting portion 133 includes an extending section 1331 that can pass through the center of the annular limiting boss 1112 and an abutting boss 1332 located on the outer circumference of the extending section 1331. The abutting boss 1332 is annular, and its outer diameter is greater than the inner diameter of the limiting boss 1112 and less than the inner diameter of the installation cavity. The outer diameter of the extending section 1331 is less than the inner diameter of the abutting boss 1332. When the locking member 13 is in the first position, the extending section 1331 extends out from the central hole of the limiting boss 1112, and the limiting boss 1112 abuts against the abutting boss 1332.

[0126] Furthermore, the limiting tooth grooves 1111 are arranged on the inner circumference of the open end of the main body portion 111. The inner circumference of the open end of the main body portion 111 is provided with ribs at intervals, and the gaps between adjacent ribs form the limiting tooth grooves 1111.

[0127] In the second embodiment of the present application, the locking member 13 is slidably arranged on the main body portion 111. When the locking member 13 slides, it pulls the end of the transmission cable 15 to move in the direction close to the main body portion 111.

[0128] In the above embodiment, the locking member 13 is slidably arranged in the main body portion 111. When the locking member 13 is driven to slide in the main body portion 111, it can make the end of the transmission cable 15 move in the direction close to the main body portion 111, thereby pulling the expansion head 12 connected to the end of the transmission cable 15 to move in the direction close to the main body portion 111, increasing the outer diameter of the variable-diameter pipe 112, and realizing the connection and fixation between the rod and the variable-diameter pipe 112.

[0129] Specifically, the locking member 13 slides in a direction perpendicular to the moving direction of the expansion head 12. When the locking member 13 slides, the transmission cable 15 drives the expansion head 12 to move in the direction close to the main body portion 111 to increase the diameter of the variable-diameter pipe 112.

[0130] In the above embodiment, the locking member 13 slides in a direction perpendicular to the axial direction of the variable-diameter pipe 112. The transmission cable 15 is connected between the locking member 13 and the expansion head 12. When the locking member 13 is driven to slide in a direction perpendicular to the moving direction of the expansion head 12, the transmission cable 15 will pull the expansion head 12 to move in the direction close to the main body portion 111, thereby increasing the outer diameter of the variable-diameter pipe 112 and making it expand and fix in the rod.

[0131] Specifically, a cylindrical installation cavity for the sliding of the locking member 13 is provided inside the main body portion 111. The locking member 13 slides along the axial direction of the cylindrical installation cavity. The reducing pipe 112 is fixedly arranged on the side portion of the main body portion 111, and the axial direction of the reducing pipe 112 is perpendicular to the axial direction of the cylindrical installation cavity. A through hole 1110 for the transmission cable 15 to pass through is provided on the side wall of the main body portion 111. The locking member 13 has a connection position and a release position in the cylindrical installation cavity. When the locking member 13 is in the release position, the transmission cable 15 is in a horizontal taut state. When the locking member 13 slides from the release position to the connection position, the transmission cable 15 forms a certain bending angle, approximately in the shape of "Γ", and at this time, the end of the transmission cable 15 is closer to the main body portion 111, pulling the expansion head 12 to move towards the direction close to the main body portion 111, so as to increase the outer diameter of the reducing pipe 112 and make it expand and fix in the rod member.

[0132] In some embodiments, a screwing portion is provided at the end of the locking member 13, and the screwing portion is used to drive the locking member 13 to rotate.

[0133] In the above embodiments, by providing the screwing portion at the end of the locking member 13, it is convenient for the user to manually rotate the locking member 13.

[0134] Specifically, the screwing portion is provided on the end wall of the locking member 13. Optionally, the screwing portion adopts a gripping rib or a screwing groove 132. When the screwing portion adopts a gripping rib, the user can pinch the gripping rib to rotate the locking member 13; when the screwing portion adopts a screwing groove 132, the user can use a screwdriver to rotate the locking member 13. In the drawings of this embodiment, the screwing portion is embodied in the form of a screwing groove 132.

[0135] In some embodiments, the connection structure 10 further includes an end cap 14, and the end cap 14 is detachably installed on the locking member 13 or the main body portion 111, and the end cap 14 is located outside the end of the locking member 13.

[0136] In the above embodiments, by providing the end cap 14 outside the end of the locking member 13, the locking member 13 can be blocked, which can not only play a role in dust prevention, preventing dust and other sundries from falling into the main body portion 111 or the screwing groove 132, but also play a role in decorative occlusion, so that the user cannot see the internal structure of the locking member 13 and the like in the main body portion 111 from the outside, improving the aesthetics.

[0137] Specifically, there are two end caps 14, and the two end caps 14 are located outside the two ends of the locking member 13. The end caps 14 can be installed on the locking member 13 and the main body portion 111 by interference fit and / or embedding installation. Optionally, the two end caps 14 are interference-fitted at both ends of the locking member 13. A plug-in groove is provided on the side of the end cap 14 facing the locking member 13. The plug-in groove is a groove and its inner diameter is slightly smaller than the outer diameter of both ends of the locking member 13. An installation groove for accommodating the end cap 14 is provided in the main body portion 111. After the locking member 13 is installed into the main body portion 111, the two end caps 14 are interference-fitted at both ends of the locking member 13 through the plug-in groove and are embedded in the accommodating groove of the main body portion 111. The outer walls of the two end caps 14 are flush with the end walls at both ends of the main body portion 111, further improving the aesthetics.

[0138] In some embodiments, a slope is provided on the outer wall of the expansion head 12. When the expansion head 12 moves, the slope on the outer wall of the expansion head 12 squeezes the inner wall of the diameter-changing tube 112 to increase the diameter of the diameter-changing tube 112. By providing the slope on the outer wall of the expansion head 12, when the expansion head 12 moves in the direction close to the main body portion 111 under the pulling of the transmission cable 15, the slope on the outer wall of the expansion head 12 can squeeze the slope on the inner wall of the diameter-changing tube 112, so that the outer diameter of the diameter-changing tube 112 increases, and the slope can also play a guiding role.

[0139] In some alternative embodiments, a slope is provided on the inner wall of the diameter-changing tube 112. The expansion head 12 moves to squeeze the slope on the inner wall of the diameter-changing tube 112 to increase the diameter of the diameter-changing tube 112. By providing the slope on the inner wall of the diameter-changing tube 112, when the expansion head 12 moves in the direction close to the main body portion 111 under the pulling of the transmission cable 15, it can squeeze the slope on the inner wall of the diameter-changing tube 112, so that the outer diameter of the diameter-changing tube 112 increases, and the slope can also play a guiding role.

[0140] In some embodiments, the diameter-changing tube 112 is provided with a deformation opening 1120. By providing the deformation opening 1120 on the diameter-changing tube 112, the diameter-changing tube 112 can be more easily deformed when being squeezed and tightened inside the rod member.

[0141] In some embodiments, a number of anti-slip ridges 1121 are provided on the outer peripheral wall of the diameter-changing tube 112. By providing the anti-slip ridges 1121 on the outer wall of the diameter-changing tube 112, the friction between the diameter-changing tube 112 and the rod member can be increased, and the stability and reliability of the connection between the diameter-changing tube 112 and the rod member can be further improved.

[0142] According to an embodiment of the present utility model, on the other hand, a connection structure 10 of a pipe is provided, which at least includes a first pipe body 20 and a second pipe body 30, and further includes a connection main body 11 and a locking member 13; the connection main body 11 includes a main body portion 111 and two reduced-diameter pipes 112 arranged on the side portion of the main body portion 111; the two reduced-diameter pipes 112 are respectively inserted into the first pipe body 20 and the second pipe body 30; an expansion head 12 is arranged in the reduced-diameter pipe 112, and when the expansion head 12 moves towards the direction close to the main body portion 111, the diameter of the reduced-diameter pipe 112 is increased to fix the reduced-diameter pipe 112 and the first pipe body 20 or the second pipe body 30; the locking member 13 is movably arranged on the main body portion 111, and the expansion heads 12 in the two reduced-diameter pipes 112 are connected through a transmission device, and when the locking member 13 moves relative to the main body portion 111, the transmission device is driven to operate or move, and further drives the expansion head 12 to move towards the direction close to the main body portion 111.

[0143] In the above embodiment, the two reduced-diameter pipes 112 located on the side portion of the main body portion 111 are respectively inserted into the first pipe body 20 and the second pipe body 30. The expansion head 12 has a large-diameter end and a small-diameter end, the outer diameter of the large-diameter end is greater than the outer diameter of the small-diameter end, and the large-diameter end is located at the end far from the main body portion 111. The small-diameter ends of the two expansion heads 12 extend into the reduced-diameter pipes 112 from the two ends of the two reduced-diameter pipes 112 respectively and are connected through a transmission device. When the locking member 13 moves relative to the main body portion 111, the transmission device is driven to operate or move, so that the expansion head 12 can be driven to move towards the direction close to the main body portion 111. The two expansion heads 12 are further squeezed into the reduced-diameter pipes 112, so that the reduced-diameter pipes 112 are further tightened, and form a tight fit with the first pipe body 20 and the second pipe body 30, realizing the connection and fixation of the first pipe body 20 and the second pipe body 30.

[0144] Specifically, the two reduced-diameter pipes 112 are arranged at a set angle, or the two reduced-diameter pipes 112 are arranged on the opposite sides of the main body portion 111 and the two are located on the same straight line. Preferably, in this embodiment, the two reduced-diameter pipes 112 are arranged on the opposite sides of the main body portion 111. The transmission device can adopt a transmission cable 15 or a lead screw structure or a rack and pinion structure.

[0145] In some embodiments, the locking member 13 is rotatably arranged on the main body portion 111, and when the locking member 13 rotates, the transmission device is driven to move, so that the expansion head 12 moves towards the direction close to the main body portion 111.

[0146] In some embodiments, the transmission device includes a transmission cable 15, the transmission cable 15 connects the two expansion heads 12, and the locking member 13 moves to make the expansion head 12 move towards the direction close to the main body portion 111.

[0147] In the above embodiments, both ends of the transmission cable 15 are respectively connected to two expansion heads 12, and the middle part is penetrated and cooperated with the locking member 13. When the locking member 13 rotates or slides within the main body portion 111, it can drive the expansion head 12 to move towards the direction close to the main body portion 111, so that the outer diameter of the variable-diameter pipe 112 increases and it is tightened and fixed within the first pipe body 20 and the second pipe body 30, realizing the connection and fixation of the first pipe body 20 and the second pipe body 30. By adopting the structural form of the transmission cable 15, the transmission device not only has a simple structure, low cost, but also occupies a small space and has high flexibility, and can be bent arbitrarily.

[0148] Optionally, the transmission cable 15 includes, but is not limited to, flexible members such as steel wires, ropes, chains, silk ribbons, cloth strips, etc.

[0149] In some embodiments, the locking member 13 is rotatably arranged in the main body portion 111. When the locking member 13 rotates, it drives a part of the transmission cable 15 to wind around the locking member 13, so that the expansion head 12 moves towards the direction close to the main body portion 111 to increase the diameter of the variable-diameter pipe 112.

[0150] In the above embodiments, the locking member 13 is rotatably arranged within the main body portion 111. When the locking member 13 is driven to rotate, it can wind a part of the transmission cable 15, shortening the length of the transmission cable 15, thereby pulling the expansion head 12 connected to the end of the transmission cable 15 towards the direction close to the main body portion 111, increasing the outer diameter of the variable-diameter pipe 112, and thus realizing the connection and fixation of the first pipe body 20 and the second pipe body 30.

[0151] Specifically, an installation cavity is provided within the main body portion 111, and the locking member 13 is rotatably arranged in this installation cavity. When the locking member 13 is driven by an external force, it can rotate inside the main body portion 111. When the locking member 13 rotates, it will wind and tighten the transmission cable 15, shortening the length of the transmission cable 15, thereby pulling the expansion head 12 towards the direction close to the main body portion 111 to increase the diameter of the variable-diameter pipe 112, so that the variable-diameter pipe 112 is tightened and fixed in the first pipe body 20 and the second pipe body 30.

[0152] In some embodiments, a notch 130 is provided in the middle of the locking member 13. One end of the transmission cable 15 is connected to one expansion head 12, and the other end passes through the notch 130 and is connected to the other expansion head 12. When the locking member 13 rotates, it drives a part of the transmission cable 15 to wind around the locking member 13, thereby simultaneously moving both expansion heads 12 towards the direction close to the main body portion 111 to increase the diameter of the variable-diameter pipe 112.

[0153] In the above embodiments, through the notch 130 provided in the middle of the locking member 13, the transmission cable 15 is threaded through the notch 130. In this way, when the locking member 13 rotates, it can wind and tighten the transmission cable 15, causing the two expansion heads 12 at both ends of the transmission cable 15 to move towards the main body portion 111, thereby increasing the outer diameters of the two variable-diameter pipes 112 to achieve the connection of the first pipe body 20 and the second pipe body 30.

[0154] Optionally, at least one end of the notch 130 penetrates through the end of the locking member 13. With such a design, the transmission cable 15 can be loaded or removed from the penetrating end of the notch 130, which is more convenient and faster. Preferably, the end of the notch 130 away from the screwing portion penetrates through the end wall of the locking member 13, and the transmission cable 15 can be limited in the notch 130 or taken out from the penetrating end of the notch 130 by disassembling and assembling the end cap 14.

[0155] In some embodiments, the transmission device includes a rotating member and a transmission rod; the rotating member is arranged on the locking member 13; one end of the transmission rod is in transmission cooperation with the rotating member, and the other end is fixedly connected to the expansion head 12; when the locking member 13 rotates, it drives the rotating member to rotate, so that the transmission rod drives the expansion head 12 to move towards the main body portion 111.

[0156] In the above embodiments, by adopting a rotating member and a transmission rod in transmission cooperation in the transmission device, when the locking member 13 rotates, it can drive the rotating member to rotate, and when the rotating member rotates, it can drive the transmission rod to move, so that the expansion head 12 connected to the end of the transmission rod moves towards the main body portion 111, thereby increasing the outer diameter of the variable-diameter pipe 112 and realizing the connection and fixation of the first pipe body 20 and the second pipe body 30.

[0157] In some embodiments, the rotating member is a transmission gear fixedly connected to one end of the locking member 13, and a rack meshing with the transmission gear is arranged at one end of the transmission rod facing the transmission gear; when the locking member 13 rotates relative to the main body portion 111, the transmission gear rotates to drive the transmission rod to move towards each other, and at the same time, the expansion head 12 moves towards the main body portion 111 to increase the diameter of the variable-diameter pipe 112.

[0158] In the above embodiments, the rotating member adopts a transmission gear fixedly arranged at one end of the locking member 13, and the transmission rod adopts a rack meshing with the transmission gear, which has the advantages of simple structure, stable, precise and efficient transmission.

[0159] In some embodiments, the locking member 13 is slidably arranged on the main body portion 111, and when the locking member 13 slides, it pulls the transmission device to move towards the main body portion 111.

[0160] In the above embodiments, the locking member 13 is slidably disposed within the main body portion 111. When the locking member 13 is driven to slide within the main body portion 111, the end of the transmission cable 15 can be moved towards the direction close to the main body portion 111, thereby pulling the expansion head 12 connected to the end of the transmission cable 15 towards the direction close to the main body portion 111, causing the outer diameter of the variable-diameter tube 112 to increase. The two variable-diameter tubes 112 are respectively tightened within the first tube body 20 and the second tube body 30, thereby realizing the connection and fixation of the first tube body 20 and the second tube body 30.

[0161] In some embodiments, the transmission device includes a transmission cable 15. The transmission cable 15 is respectively connected to the two expansion heads 12. The locking member 13 slides to move the two expansion heads 12 simultaneously towards the direction close to the main body portion 111.

[0162] In the above embodiments, by using the transmission cable 15 to contract the two expansion heads 12, the structure is simple, the cost is low, space is saved, and the transmission cable 15 has a certain flexibility, saving space and facilitating winding and unwinding, enabling the expansion head 12 to closely adjoin the main body portion 111, thereby enabling the outer diameter of the variable-diameter tube 112 to further increase and improving the fixing effect of the variable-diameter tube 112 with the first tube body and the second tube body.

[0163] Specifically, one end of the transmission cable 15 is connected to one expansion head 12, and the other end passes through the main body portion 111 and the locking member 13 and is connected to the other expansion head 12. The transmission cable 15 includes, but is not limited to, flexible members such as steel wires, ropes, chains, silk ribbons, and cloth strips.

[0164] In some embodiments, the locking member 13 slides in a direction perpendicular to the moving direction of the expansion head 12. When the locking member 13 slides, the transmission cable 15 drives the expansion head 12 to move towards the direction close to the main body portion 111 to increase the diameter of the variable-diameter tube 112.

[0165] In the above embodiments, the locking member 13 slides in a direction perpendicular to the axial direction of the variable-diameter tube 112. The transmission cable 15 is connected between the locking member 13 and the expansion head 12. When the locking member 13 is driven to slide in a direction perpendicular to the moving direction of the expansion head 12, the transmission cable 15 will pull the expansion head 12 towards the direction close to the main body portion 111, thereby causing the outer diameters of the two variable-diameter tubes 112 to increase, enabling the two variable-diameter tubes 112 to be tightened and fixed within the first tube body 20 and the second tube body 30, and realizing the connection of the two tube bodies.

[0166] Specifically, a cylindrical installation cavity for the sliding of the locking member 13 is provided inside the main body portion 111. The locking member 13 slides along the axial direction of the cylindrical installation cavity. The variable-diameter pipes 112 are fixedly arranged on both sides of the main body portion 111, and the axial direction of the variable-diameter pipes 112 is perpendicular to the axial direction of the cylindrical installation cavity. Through holes 1110 for the transmission cable 15 to pass through are correspondingly provided on both sides of the main body portion 111. The locking member 13 has a connection position and a release position in the cylindrical installation cavity. When the locking member 13 is in the release position, the transmission cable 15 is in a horizontal taut state. When the locking member 13 slides from the release position to the connection position, the transmission cable 15 forms a certain bending angle, approximately in a V shape. At this time, the two end portions of the transmission cable 15 are closer to the main body portion 111, and can pull the two expansion heads 12 to move towards the direction close to the main body portion 111, so that the outer diameters of the two variable-diameter pipes 112 increase, thereby realizing the connection between the first pipe body 20 and the second pipe body 30.

[0167] In some embodiments, a one-way locking mechanism is provided between the locking member 13 and the main body portion 111. The one-way locking mechanism is used to limit the reverse rotation of the locking member 13; when the locking member 13 rotates forward, it drives the transmission cable 15 to partially wind around the locking member 13, and when the locking member 13 rotates reversely, the transmission cable 15 wound on its surface can be disengaged.

[0168] In the above embodiments, by providing the one-way locking mechanism between the locking member 13 and the main body portion 111, the reverse rotation of the locking member 13 can be effectively limited, and the situation that the transmission cable 15 wound on its surface is disengaged due to the reverse rotation of the locking member 13, which affects the fixing effect between the two pipe bodies and the variable-diameter pipes 112, can be avoided, and the stability and reliability of the connection between the first pipe body 20 and the second pipe body 30 are further improved.

[0169] In some embodiments, the one-way locking mechanism includes a limiting tooth groove 1111 and an elastic ratchet tooth 131. One of the limiting tooth groove 1111 and the elastic ratchet tooth 131 is provided on the main body portion 111, and the other is provided on the locking member 13. The elastic ratchet tooth 131 cooperates with the limiting tooth groove 1111 to limit the reverse rotation of the locking member 13.

[0170] In the above embodiments, the one-way locking mechanism adopts the structural form of the limiting tooth groove 1111 and the elastic ratchet tooth 131, with a simple structure and good limiting effect.

[0171] In one example, the elastic ratchet teeth 131 are provided on the locking member 13, and the limiting tooth grooves 1111 are provided on the main body portion 111. The locking member 13 has a columnar main body. There are multiple elastic ratchet teeth 131, and the multiple elastic ratchet teeth 131 are arranged at intervals along the circumferential direction of the columnar main body, and the multiple elastic ratchet teeth 131 are all inclined in the clockwise direction or the counterclockwise direction. The number of the limiting tooth grooves 1111 is twice the number of the elastic ratchet teeth 131, and the elastic ratchet teeth 131 are alternately inserted and engaged in the limiting tooth grooves 1111. In the drawings of this embodiment, it is shown in a form that multiple elastic ratchet teeth 131 are all inclined in the counterclockwise direction, the number of the elastic ratchet teeth 131 is three, and the number of the limiting tooth grooves 1111 is six.

[0172] In some embodiments, the one-way locking mechanism has a locked state and an unlocked state. When the one-way locking mechanism is in the locked state, the elastic ratchet teeth 131 are engaged with the limiting tooth grooves 1111 to restrict the reverse rotation of the locking member 13; when the one-way locking mechanism is in the unlocked state, the elastic ratchet teeth 131 are separated from the limiting tooth grooves 1111, and the locking member 13 can rotate in the reverse direction.

[0173] In the above embodiment, when the one-way locking mechanism is in the locked state, the elastic ratchet teeth 131 are engaged with the limiting tooth grooves 1111, which can restrict the reverse rotation of the locking member 13, so that the first pipe body 20 and the second pipe body 30 are kept in a stable connection state with the reducing pipe 112. When the one-way locking mechanism is in the unlocked state, the elastic ratchet teeth 131 are separated from the limiting tooth grooves 1111, and the locking member 13 can rotate in the reverse direction, so that the expansion head 12 can be released, facilitating the disassembly of the first pipe body 20 and the second pipe body 30.

[0174] In some embodiments, the locking member 13 can move in a direction perpendicular to the moving direction of the expansion head 12. The locking member 13 has a first position and a second position. When the locking member 13 is in the first position, the one-way locking mechanism is in the locked state. When the locking member 13 is in the second position, the one-way locking mechanism is in the unlocked state.

[0175] In the above embodiment, by controlling the locking member 13 to move between the first position and the second position, the switching of the one-way locking mechanism between the locked state and the unlocked state can be realized, so that the elastic ratchet teeth 131 are engaged with or separated from the limiting tooth grooves 1111, which is very convenient and fast.

[0176] Specifically, a cylindrical installation cavity is provided in the main body portion 111. The columnar main body of the locking member 13 is located in the cylindrical installation cavity, and the two are coaxially arranged. The locking member 13 can move along the axial direction of the cylindrical installation cavity to switch between the first position and the second position. The reducing pipes 112 are fixedly arranged on both sides of the main body portion 111. The axial direction of the reducing pipes 112 is perpendicular to the axial direction of the cylindrical installation cavity. A through hole 1110 through which the transmission cable 15 can pass is provided on the side wall of the main body portion 111.

[0177] In some embodiments, when the locking member 13 is in the first position, the locking member 13 is located within the main body portion 111, and the elastic ratchet teeth 131 are engaged with the limiting tooth grooves 1111 to restrict the reverse rotation of the locking member 13; when the locking member 13 is in the second position, the locking member 13 at least partially extends out of the main body portion 111, the elastic ratchet teeth 131 are separated from the limiting tooth grooves 1111, and the locking member 13 can rotate in the reverse direction.

[0178] In the above embodiments, by controlling the locking member 13 to extend into or out of the main body portion 111, the engagement or separation of the elastic ratchet teeth 131 and the limiting tooth grooves 1111 can be achieved, and the operation is relatively convenient.

[0179] Specifically, at least one end of the cylindrical installation cavity is provided with an opening, and the locking member 13 can extend into or out of the main body portion 111 from this opening. Preferably, in this embodiment, both ends of the cylindrical installation cavity are provided with openings, and the user can push the locking member 13 from one opening so that it extends out from the other opening, and the operation is more convenient.

[0180] In some embodiments, an installation cavity is provided in the main body portion 111 in a direction perpendicular to the moving direction of the expansion head 12, and the locking member 13 is slidably arranged in the installation cavity.

[0181] In the above embodiments, the extending direction of the installation cavity is perpendicular to the axial direction of the variable diameter pipe 112, and the locking member 13 is slidably arranged in this installation cavity, which is convenient for switching between the first position and the second position.

[0182] In some embodiments, the installation cavity is provided with a limiting boss 1112 for restricting the displacement of the locking member 13. When the locking member 13 is in the first position, the locking member 13 abuts against the limiting boss 1112 to prevent the locking member 13 from disengaging from the installation cavity.

[0183] In the above embodiments, openings are provided at both the upper and lower ends of the installation cavity. Through the limiting boss 1112 provided in the installation cavity, when the locking member 13 extends from the opening at one end of the installation cavity into the first position within the main body portion 111, the limiting boss 1112 can abut against the locking member 13, thereby preventing the locking member 13 from disengaging from the opening at the other end of the main body portion 111.

[0184] Specifically, the installation cavity is cylindrical. One end of it is an open end through which the locking member 13 can extend in and out, and the other end is a closed end provided with a limiting boss 1112. The limiting boss 1112 is annular and fixedly arranged on the inner circumference of the installation cavity. A stepped limiting portion 133 is arranged at one end of the columnar body of the locking member 13 close to the limiting boss 1112. The stepped limiting portion 133 includes an extending section 1331 that can pass through the center of the annular limiting boss 1112 and an abutting boss 1332 located on the outer circumference of the extending section 1331. The abutting boss 1332 is annular and its outer diameter is greater than the inner diameter of the limiting boss 1112 and less than the inner diameter of the installation cavity. The outer diameter of the extending section 1331 is less than the inner diameter of the abutting boss 1332. When the locking member 13 is in the first position, the extending section 1331 extends out from the central hole of the limiting boss 1112, and the limiting boss 1112 abuts against the abutting boss 1332.

[0185] Further, the limiting tooth grooves 1111 are arranged on the inner circumference of the open end of the main body portion 111. The inner circumference of the open end of the main body portion 111 is provided with protruding ribs at intervals, and the gaps between adjacent protruding ribs form the limiting tooth grooves 1111.

[0186] In some embodiments, the connection structure 10 further includes an end cap 14. The end cap 14 is detachably installed on the locking member 13 or the main body portion 111, and the end cap 14 is located outside the end of the locking member 13.

[0187] In the above embodiments, by providing the end cap 14 outside the end of the locking member 13, the locking member 13 can be blocked, which can not only play a role in dust prevention, preventing dust and other sundries from falling into the main body portion 111 or the screwing groove 132, but also play a role in decorative shielding, so that the user cannot see the internal structure such as the locking member 13 of the main body portion 111 from the outside, improving the aesthetics.

[0188] Specifically, there are two end caps 14. The two end caps 14 are located outside the two end portions of the locking member 13. The end cap 14 can be installed on the locking member 13 and the main body portion 111 by means of interference fit and / or embedding installation. Optionally, the two end caps 14 are interference-fitted at both ends of the locking member 13. A plug-in groove is arranged on the side of the end cap 14 facing the locking member 13. The plug-in groove is a groove and its inner diameter is slightly smaller than the outer diameter of both ends of the locking member 13. An installation groove for accommodating the end cap 14 is arranged in the main body portion 111. After the locking member 13 is installed into the main body portion 111, the two end caps 14 are interference-fitted at both ends of the locking member 13 through the plug-in groove and are embedded in the accommodating groove of the main body portion 111. The outer walls of the two end caps 14 are flush with the end walls at both ends of the main body portion 111, further improving the aesthetics.

[0189] In some embodiments, the expansion head 12 includes a first end close to the main body portion 111 and a second end far from the main body portion 111. The outer diameter of the second end is greater than the outer diameter of the first end.

[0190] In the above embodiments, the outer diameter of the second end of the expansion head 12 away from the main body portion 111 is greater than the outer diameter of the first end close to the main body portion 111. Thus, when the transmission cable 15 is tightened, the two expansion heads 12 located at both ends thereof can be driven to move towards the direction close to the main body portion 111, squeezing the variable-diameter tube 112, so that the diameter of the variable-diameter tube 112 increases, thereby realizing the expansion and tightening of the two variable-diameter tubes 112 and the two tubes, and further realizing the connection between the first tube 20 and the second tube 30.

[0191] In some embodiments, a screwing portion is provided at the end of the locking member 13, and the screwing portion is used to drive the locking member 13 to rotate when driven.

[0192] In the above embodiments, by means of the screwing portion provided at the end of the locking member 13, it is convenient for the user to manually rotate the locking member 13.

[0193] Specifically, the screwing portion is provided on the end wall of the locking member 13. Optionally, the screwing portion adopts a gripping rib or a screwing groove 132. When the screwing portion adopts a gripping rib, the user can pinch the gripping rib with the hand to rotate the locking member 13; when the screwing portion adopts the screwing groove 132, the user can use a screwdriver to rotate the locking member 13. In the drawings of this embodiment, the screwing portion is embodied in the form of the screwing groove 132.

[0194] In some embodiments, there are two expansion heads 12, and the two expansion heads 12 are symmetrically arranged relative to the locking member 13. When the locking member 13 moves, the two expansion heads 12 are driven to move towards the direction close to the main body portion 111 at the same time, thereby increasing the diameters of the two variable-diameter tubes 112 to realize the connection between the first tube 20 and the second tube 30.

[0195] In the above embodiments, through the two expansion heads 12 symmetrically arranged relative to the locking member 13, when the locking member 1 is moving, the two expansion heads 12 can be driven to move synchronously, so that the two variable-diameter tubes 112 and the two tubes are synchronously expanded and tightened and fixed, and the fixing effect is better, avoiding the phenomenon that one side of the variable-diameter tube 112 is firmly fixed to the tube while the other side of the variable-diameter tube 112 is still relatively loose from the tube.

[0196] The pipe connection structure 10 provided in this embodiment is used to connect two pipe bodies. Specifically, the connection structure 10 is used to connect the first pipe body 20 and the second pipe body 30. The connection structure 10 includes a connection main body 11 and a locking member 13. The connection main body 11 includes a main body portion 111 and two reduced-diameter pipes 112 located on both sides of the main body portion 111. The first pipe body 20 and the second pipe body 30 are respectively sleeved on the two ends of the two reduced-diameter pipes 112. Expansion heads 12 are distributed in the two reduced-diameter pipes 112. Each expansion head 12 has a large end and a small end. The small ends of the two expansion heads 12 respectively extend into the reduced-diameter pipes 112 from the two ends of the reduced-diameter pipes 112 and are connected by a transmission cable 15. When the locking member 13 is rotated or the locking member 13 is axially moved along the main body portion 111, the transmission cable 15 can be tightened, driving the two expansion heads 12 to further squeeze into the reduced-diameter pipes 112, so that the reduced-diameter pipes 112 are further expanded and tightened, forming a tight fit with the first pipe body 20 and the second pipe body 30, realizing the connection and fixation of the first pipe body 20 and the second pipe body 30. The structure is simple, the connection is stable and reliable, and it is convenient to disassemble and assemble, effectively solving the problems of the existing pipe connection structure 10, such as complex structure, unstable connection, and inconvenient disassembly.

[0197] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A connecting structure for a rod member, characterized in that, Comprising: A connecting body (11), including a main body portion (111) and a reduced-diameter pipe (112) located on the side of the main body portion (111); An expansion head (12), movably arranged in the reduced-diameter pipe (112), and the expansion head (12) can move in a direction close to the main body portion (111) to increase the diameter of the reduced-diameter pipe (112); A locking member (13), movably arranged on the main body portion (111), a transmission cable (15) is arranged between the expansion head (12) and the locking member (13), and the locking member (13) moves relative to the main body portion (111) to pull the end of the transmission cable (15) to move in a direction close to the main body portion (111), thereby driving the expansion head (12) to move in the same direction.

2. The connecting structure of the rod according to claim 1, characterized in that, The locking member (13) is rotatably arranged on the main body portion (111), and when the locking member (13) rotates, it drives the transmission cable (15) to partially wind around the locking member (13) to pull the end of the transmission cable (15) to move in a direction close to the main body portion (111).

3. The connecting structure of the rod according to claim 2, characterized in that A one-way locking mechanism is arranged between the locking member (13) and the main body portion (111), and the one-way locking mechanism is used to limit the reverse rotation of the locking member (13); When the locking member (13) rotates forward, it drives the transmission cable (15) to partially wind around the locking member (13), and when the locking member (13) rotates backward, the transmission cable (15) wound on its surface can be disengaged.

4. The connecting structure of the rod according to claim 3, characterized in that, The one-way locking mechanism includes a limiting tooth groove (1111) and an elastic ratchet tooth (131), one of the limiting tooth groove (1111) and the elastic ratchet tooth (131) is arranged on the main body portion (111), and the other is arranged on the locking member (13), and the elastic ratchet tooth (131) cooperates with the limiting tooth groove (1111) to limit the reverse rotation of the locking member (13).

5. The connecting structure of the rod according to claim 4, characterized in that The one-way locking mechanism has a locked state and an unlocked state; When the one-way locking mechanism is in the locked state, the elastic ratchet tooth (131) meshes with the limiting tooth groove (1111) to limit the reverse rotation of the locking member (13); when the one-way locking mechanism is in the unlocked state, the elastic ratchet tooth (131) is separated from the limiting tooth groove (1111), and the locking member (13) can rotate backward.

6. The connecting structure of the rod according to claim 5, characterized in that, The locking member (13) can move in a direction perpendicular to the moving direction of the expansion head (12), the locking member (13) has a first position and a second position, when the locking member (13) is in the first position, the one-way locking mechanism is in the locked state; when the locking member (13) is in the second position, the one-way locking mechanism is in the unlocked state.

7. The connecting structure of the rod according to claim 6, characterized in that, When the locking member (13) is in the first position, the locking member (13) is located inside the main body portion (111), and the elastic ratchet tooth (131) meshes with the limiting tooth groove (1111) to limit the reverse rotation of the locking member (13); When the locking member (13) is in the second position, the locking member (13) at least partially protrudes from the main body portion (111), the elastic ratchet teeth (131) are separated from the limit tooth grooves (1111), and the locking member (13) can rotate reversely.

8. The connecting structure of the rod according to claim 7, characterized in that, The main body portion (111) is provided with an installation cavity in a direction perpendicular to the moving direction of the expansion head (12), and the locking member (13) is slidably arranged in the installation cavity.

9. The connecting structure of the rod according to claim 8, characterized in that, The installation cavity is provided with a limit boss (1112) for restricting the displacement of the locking member (13). When the locking member (13) is in the first position, the locking member (13) abuts against the limit boss (1112) to prevent the locking member (13) from disengaging from the installation cavity.

10. The connecting structure of the rod according to claim 1, characterized in that, The locking member (13) is slidably arranged on the main body portion (111). When the locking member (13) slides, it pulls the end of the transmission cable (15) to move towards the direction close to the main body portion (111).

11. The connecting structure of the rod according to claim 10, characterized in that, The locking member (13) slides in a direction perpendicular to the moving direction of the expansion head (12). When the locking member (13) slides, the transmission cable (15) drives the expansion head (12) to move towards the direction close to the main body portion (111) to increase the diameter of the variable-diameter pipe (112).

12. The connecting structure of the rod according to any one of claims 1 to 11, characterized in that, A screwing portion is arranged at the end of the locking member (13), and the screwing portion is used to drive the locking member (13) to rotate when being driven.

13. The connecting structure of the rod according to any one of claims 1 to 11, characterized in that, The connection structure (10) further includes: An end cover (14), the end cover (14) is detachably installed on the locking member (13) or the main body portion (111), and the end cover (14) is located outside the end of the locking member (13).

14. The connecting structure of the rod according to any one of claims 1 to 11, characterized in that, The outer wall of the expansion head (12) is provided with an inclined surface. When the expansion head (12) moves, the inclined surface on the outer wall of the expansion head (12) squeezes the inner wall of the variable-diameter pipe (112) to increase the diameter of the variable-diameter pipe (112); And / or, the inner wall of the variable-diameter pipe (112) is provided with an inclined surface, and the expansion head (12) moves to squeeze the inclined surface on the inner wall of the variable-diameter pipe (112) to increase the diameter of the variable-diameter pipe (112).

15. A connecting structure of pipes, at least including a first pipe body (20) and a second pipe body (30), characterized in that, It further includes a connection main body (11) and a locking member (13); The connection main body (11) includes a main body portion (111) and two variable-diameter pipes (112) arranged on the side portion of the main body portion (111); the two variable-diameter pipes (112) are respectively inserted into the first pipe body (20) and the second pipe body (30); An expansion head (12) is arranged in the variable-diameter pipe (112). When the expansion head (12) moves towards the direction close to the main body portion (111), it increases the diameter of the variable-diameter pipe (112) to fix the variable-diameter pipe (112) with the first pipe body (20) or the second pipe body (30); The locking member (13) is movably arranged on the main body portion (111). The expansion heads (12) in the two reduced-diameter pipes (112) are connected by a transmission device. When the locking member (13) moves relative to the main body portion (111), it drives the transmission device to operate or move, thereby driving the expansion heads (12) to move towards the main body portion (111).

16. The connection structure (10) of a pipe according to claim 15, characterized in that, The locking member (13) is rotatably arranged on the main body portion (111). When the locking member (13) rotates, it drives the transmission device to move, so that the expansion heads (12) move towards the main body portion (111).

17. The connection structure (10) of the pipe according to claim 16, characterized in that, The transmission device includes a transmission cable (15). The transmission cable (15) connects two expansion heads (12). The locking member (13) moves, so that the expansion heads (12) move towards the main body portion (111).

18. The connection structure of the pipe according to claim 17, characterized in that, The locking member (13) is rotatably arranged on the main body portion (111). When the locking member (13) rotates, it drives the transmission cable (15) to partially wind around the locking member (13), so that the expansion heads (12) move towards the main body portion (111) to increase the diameter of the reduced-diameter pipe (112).

19. The connection structure of the pipe according to claim 18, wherein, A notch (130) is provided in the middle of the locking member (13). One end of the transmission cable (15) is connected to one expansion head (12), and the other end passes through the notch (130) and is connected to the other expansion head (12). When the locking member (13) rotates, it drives the transmission cable (15) to partially wind around the locking member (13), thereby simultaneously causing the two expansion heads (12) to move towards the main body portion (111) to increase the diameter of the reduced-diameter pipe (112).

20. The connection structure of the pipe according to claim 18, characterized in that, The transmission device includes: a rotating member and a transmission rod; the rotating member is arranged on the locking member (13); one end of the transmission rod is in transmission cooperation with the rotating member, and the other end is fixedly connected to the expansion head (12); When the locking member (13) rotates, it drives the rotating member to rotate, so that the transmission rod drives the expansion head (12) to move towards the main body portion (111).

21. The connection structure of the pipe according to claim 20, characterized in that, The rotating member is a transmission gear fixedly connected to one end of the locking member (13). A rack meshing with the transmission gear is arranged at one end of the transmission rod facing the transmission gear; When the locking member (13) rotates relative to the main body portion (111), it causes the transmission gear to rotate, so as to drive the transmission rods to move towards each other, and at the same time cause the expansion heads (12) to move towards the main body portion (111) to increase the diameter of the reduced-diameter pipe (112).

22. The connection structure of the pipe according to claim 15, characterized in that, The locking member (13) is slidably arranged on the main body portion (111). When the locking member (13) slides, it pulls the transmission device to move towards the main body portion (111).

23. The connection structure of the pipe according to claim 22, characterized in that, The transmission device includes a transmission cable (15). The transmission cable (15) is respectively connected to two expansion heads (12). The locking member (13) slides so that the two expansion heads (12) move towards the main body portion (111) simultaneously.

24. The connection structure of the pipe according to claim 23, characterized in that, The locking member (13) slides in a direction perpendicular to the moving direction of the expansion head (12). When the locking member (13) slides, the transmission cable (15) drives the expansion head (12) to move toward the main body (111), thereby increasing the diameter of the reducer (112).

25. The connecting structure of the pipe according to any one of claims 17 to 21, characterized in that, A one-way locking mechanism is provided between the locking member (13) and the main body (111), and the one-way locking mechanism is used to limit the reverse rotation of the locking member (13); When the locking member (13) rotates in the forward direction, the transmission rope (15) is driven to be partially wound around the locking member (13); when the locking member (13) rotates in the reverse direction, the transmission rope (15) wound around the surface of the locking member (13) can be disengaged.

26. The connection structure of the pipe according to claim 25, characterized in that, The one-way locking mechanism comprises a limiting tooth groove (1111) and an elastic ratchet (131), one of the limiting tooth groove (1111) and the elastic ratchet (131) being arranged on the main body (111), and the other being arranged on the locking member (13), and the elastic ratchet (131) cooperating with the limiting tooth groove (1111) to limit the reverse rotation of the locking member (13).

27. The connection structure of the pipe according to claim 26, characterized in that, The one-way locking mechanism has a locked state and an unlocked state. When the one-way locking mechanism is in the locked state, the elastic ratchet (131) engages with the limiting tooth groove (1111) to limit the locking member (13) from rotating in the reverse direction. When the one-way locking mechanism is in the unlocked state, the elastic ratchet (131) separates from the limiting tooth groove (1111) and the locking member (13) can rotate in the reverse direction.

28. The connection structure of the pipe according to claim 27, characterized in that, The locking member (13) is capable of moving in a direction perpendicular to the moving direction of the expansion head (12), and the locking member (13) has a first position and a second position. When the locking member (13) is in the first position, the one-way locking mechanism is in a locked state, and when the locking member (13) is in the second position, the one-way locking mechanism is in an unlocked state.

29. The connecting structure of the pipe according to claim 28, characterized in that, When the locking member (13) is in the first position, the locking member (13) is located in the main body (111), and the elastic ratchet (131) is engaged with the limiting tooth groove (1111), thereby limiting the reverse rotation of the locking member (13); When the locking member (13) is in the second position, the locking member (13) at least partially extends out of the main body (111), the elastic ratchet (131) is separated from the limiting tooth groove (1111), and the locking member (13) can rotate in the opposite direction.

30. The connection structure of the pipe according to claim 29, characterized in that, The main body (111) is provided with a mounting cavity in a direction perpendicular to the moving direction of the expansion head (12), and the locking member (13) is slidably arranged in the mounting cavity.

31. The connection structure of the pipe according to claim 30, wherein, The mounting cavity is provided with a limiting boss (1112) for limiting the displacement of the locking member (13); when the locking member (13) is in the first position, the locking member (13) abuts against the limiting boss (1112) to prevent the locking member (13) from falling out of the mounting cavity.

32. The connecting structure of the pipe according to any one of claims 15 to 24, 26 to 31, characterized in that, The connecting structure (10) further comprises: An end cap (14), the end cap (14) is detachably mounted on the locking member (13) or the main body portion (111), and the end cap (14) is located outside the end of the locking member (13).

33. The connection structure of the pipe according to any one of claims 15 to 24, 26 to 31, characterized in that, The expansion head (12) includes a first end close to the main body portion (111) and a second end far from the main body portion (111), and the outer diameter of the second end is greater than the outer diameter of the first end.

34. The connection structure of the pipe according to any one of claims 15 to 20 and 26 to 31, characterized in that, A screwing portion is provided on the end of the locking member (13), and the screwing portion is used to drive the locking member (13) to rotate when driven.

35. The connecting structure of the pipe according to any one of claims 15 to 24, 26 to 31, characterized in that, There are two expansion heads (12), and the two expansion heads (12) are symmetrically arranged relative to the locking member (13). When the locking member (13) moves, it drives the two expansion heads (12) to move simultaneously in the direction close to the main body portion (111), so as to increase the diameters of the two variable-diameter tubes (112) to realize the connection of the first pipe body (20) and the second pipe body (30).

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