A flat tube butt joint tool and a flat tube precision butt joint method
By designing a flat tube docking fixture, and utilizing components such as slots, clamps, pins, and slide rails, automated and precise docking of flat tubes is achieved, solving the problems of low efficiency and insufficient precision in flat tube docking. It is suitable for flat tubes in confined spaces and various twisted shapes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANGHAI AEROSPACE EQUIPMENTS MANUFACTURER CO LTD
- Filing Date
- 2026-03-02
- Publication Date
- 2026-06-12
AI Technical Summary
Existing technologies for flat tube docking are inefficient and cannot guarantee the horizontal accuracy of docking in one go. They are also complex to operate, require specialized technicians, and cannot meet the needs of high-density tasks.
A flat tube docking fixture was designed, including a flat tube pin seat, a socket seat, a screw and nut pair, and a sliding guide rail seat. Using components such as slots, clamps, pins, and linear slide rails, the fixture achieves precise docking of flat tubes through motor drive, ensuring the horizontality and verticality of the docking.
It enables automated, safe, and reliable precise docking of flat tubes, is suitable for confined spaces, simplifies the operation process, improves docking efficiency, reduces docking difficulty, and is applicable to flat tubes of various twisted shapes.
Smart Images
Figure CN122184784A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to mechanical design and manufacturing, and in particular to an automatic flat tube docking fixture and a method for precise docking of flat tubes. Background Technology
[0002] The flat tube separation device is a commonly used linear separation device on space launch vehicles. Its operation involves using the energy and gas from the explosion of explosive filler to inflate the flat tube from a flat shape to a spherical shape. Because the flat tube is filled with explosives, extremely precise operation is required during installation to ensure accurate docking. Twisting during the manufacturing process can compromise the horizontality of the flat tube, leading to inconsistencies in its horizontal alignment. The horizontality of the docking directly affects the sealing performance of the flat tubes, making docking more demanding and significantly increasing the operational difficulty.
[0003] When connecting flat tubes, it is necessary to ensure that the flat tubes on both sides of the connecting pipeline are on the same horizontal plane. However, due to the limited operating space for the flat tubes in linear devices, existing measuring instruments are too large and their shapes are mismatched, making them unsuitable for flat tube connection. This significantly reduces the efficiency of flat tube connection. Currently, experienced technicians can use tools to clamp the flat tubes on both sides and adjust their horizontal consistency multiple times to ensure the accuracy of the flat tube connection. While this meets the requirements, it is too limiting for high-efficiency work. There is no specific measuring fixture, and operation requires specialized senior technicians, which cannot meet the demands of current high-density tasks. The purpose of this invention is to overcome the shortcomings of existing technologies and provide an automated and easy-to-operate flat tube connection fixture. Summary of the Invention
[0004] To address the aforementioned problems, the present invention aims to provide an automatic flat tube docking fixture and a method for precise flat tube docking, thereby solving the technical problems of low docking efficiency and inability to guarantee docking horizontal accuracy in a single operation in the prior art.
[0005] This invention provides a flat tube butt joint fixture, characterized in that it includes a flat tube pin seat 11, a flat tube insertion hole seat 12, a lead screw and nut pair 2, and a sliding guide seat 71. The flat tube pin seat 11 and the flat tube insertion hole seat 12 are respectively provided with two slots of the same size as the flat tube for positioning the flat tube in the circumferential direction. A flat tube insertion end limiting groove 111 is provided at the edge of the slot in the flat tube pin seat for positioning the first flat tube 61 in the axial direction. A flat tube sleeve end limiting groove 121 is provided at the edge of the slot in the flat tube insertion hole seat for positioning the second flat tube 64 in the axial direction. Flat tube clamp base hinges 41 are respectively provided on the flat tube pin seat 11 and the flat tube insertion hole seat 12. The flat tube clamp 42 is connected to the flat tube clamp base hinge 41 and the flat tube clamp 42 by a pin. One end of the flat tube clamp base hinge 41 is connected to the flat tube clamp base hinge 41, and the other end is connected to the flat tube pin seat 11 and the flat tube insertion hole seat 12 for fastening the flat tube. The flat tube clamp 42 is provided with two slots that are the same size as the flat tube for positioning the flat tube in the radial direction. The flat tube pin seat 11 is provided with a docking seat pin 5, which is inserted into the pin hole of the flat tube insertion seat 12 when the flat tubes are docked to ensure the horizontal and vertical accuracy of the docking. One end of the lead screw nut assembly 2 is fixedly connected to the flat tube pin seat 11, and the other end is fixedly connected to the flat tube insertion hole seat 12. The sliding guide seat 71 is fixedly connected to the flat tube pin seat 11 and the flat tube insertion hole seat 12 respectively, and the linear slide rail 72 is connected to the sliding guide seat 71 at both ends to ensure that the flat tube pin seat 11 and the flat tube insertion hole seat 12 move horizontally in a straight line.
[0006] The present invention also provides a method for precise docking of flat tubes, which uses the above-mentioned flat tube docking fixture and includes the following steps: When the operator needs to connect the flat tube, the screw nut assembly 2 reverses to drive the flat tube pin seat 11 to move horizontally and linearly away from the flat tube insertion hole seat 12 along the direction of the linear slide rail 72, so that the flat tube clamp 42 on the flat tube pin seat 11 adapts to the second flat tube 64, the flat tube clamp 42 on the flat tube pin seat 12 adapts to the first flat tube 61, and the flat tube insertion end limiting groove 111 adapts to the flat tube insertion end 62. Open the two flat tube clamps 42 on the flat tube pin seat 11 and the flat tube socket seat 12, install the first flat tube 61 to be connected into the flat tube slot on the flat tube pin seat 11, install the second flat tube 64 to be connected into the flat tube slot on the flat tube socket seat 12, and then insert the flat tube clamp 42 into the clamp fixing stud 43 and tighten the clamp fixing nut 44. The forward rotation of the lead screw and nut assembly 2 drives the flat tube pin seat 11 to move horizontally and linearly along the direction of the linear slide rail 72 towards the flat tube insertion hole seat 12, so that the flat tube pin seat 11 moves towards the flat tube insertion hole seat 12 until the mating pin 5 on the flat tube pin seat 11 is inserted into the pin hole of the flat tube insertion hole seat 12, and the first flat tube 61 and the second flat tube 64 are automatically mated.
[0007] This invention is widely used in the installation of flat pipes, is easy to operate, safe and reliable, and can be adapted to the installation of flat pipes in narrow spaces, thus having good practicality.
[0008] This invention proposes a flat tube butt welding fixture, which utilizes the principles of pins, slide rails, and lead screw and nut pairs to design a fixture capable of precisely butt welding flat tubes. The invention uses a motor to drive the lead screw and nut pair, causing the flat tube butt welding seat to move the flat tube along a linear slide rail. During butt welding, the flat tube pin seat can be inserted into the flat tube insertion hole seat without tools, greatly reducing the difficulty of pulling the pipe during butt welding. The flat tube clamp secures the two ends of the flat tube to be connected to the flat tube butt welding seat, ensuring the radial positioning of the flat tube; the flat tube groove on the flat tube butt welding seat ensures circumferential positioning; the limiting grooves at the insertion end and sleeve end of the flat tube ensure axial positioning; and the matching of the pin and insertion hole on the flat tube butt welding seat ensures the horizontality of the butt welding of the flat tube ends, improving the butt welding accuracy and installation quality. When the connector pin is fully inserted into the pin hole, the contact-type pressure sensor on the connector pin touches the bottom of the pin hole. The pressure sensor sends a signal to stop the drive motor, ensuring that the horizontal torque applied to the flat tube by the flat tube tooling during the pipe connection process is not excessive, thus guaranteeing product safety. The limit device of the linear guide rail also ensures the safety of the operator. Furthermore, the entire connection process is achieved via a push-button switch, requiring no specialized technicians or tools, making it convenient and efficient, with excellent practicality and great potential for widespread adoption. Attached Figure Description
[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below.
[0010] Figure 1 The diagram shown is a schematic diagram of the structure of a flat pipe installation using a flat pipe butt joint tooling according to a preferred embodiment of the present invention. Figure 2 The diagram shown is a schematic diagram of the flat pipe butt welding fixture structure of a preferred embodiment of the present invention. Figure 3 The diagram shown is a schematic diagram of the flat tube butt joint tooling pin seat and socket seat according to a preferred embodiment of the present invention. Figure 4 The diagram shown is a schematic diagram of a flat tube connection structure according to a preferred embodiment of the present invention.
[0011] In the diagram: 11: Flat tube pin seat, 111: Flat tube insertion end limiting groove, 12: Flat tube insertion hole seat, 121: Flat tube sleeve end limiting groove, 2: Screw nut pair, 3: Drive motor, 31: Push button switch, 41: Flat tube clamp base hinge, 42: Flat tube clamp, 43: Clamp fixing stud, 44: Clamp fixing nut, 5: Connecting seat pin, 51: Connecting seat pin hole, 61: Flat tube 1, 62: Flat tube insertion end, 63: Flat tube sleeve end, 64: Flat tube 2, 71: Sliding guide rail seat, 72: Linear slide rail, 8: Contact type pressure sensor. Detailed Implementation
[0012] To make the technical problems solved by the present invention, the technical methods adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise ratios, and are only used for the purpose of conveniently and clearly assisting in illustrating the embodiments of the present invention.
[0013] This invention discloses an automatic docking fixture for flat tubes and a method for precise docking of flat tubes.
[0014] Figure 1 The diagram shown is a structural schematic of a preferred embodiment of the present invention, illustrating the installation of a flat pipe using a flat pipe butt joint fixture. Figure 1 The assembly process of the flat pipe assembly tooling according to a preferred embodiment of the present invention is shown. Figure 2 This is a schematic diagram of the flat pipe butt joint tooling of the present invention. Figure 2 The structure of the flat tube butt joint tooling of the present invention is shown. Figure 3 The diagram shown is a schematic diagram of the flat tube butt joint tooling pin seat and socket seat according to a preferred embodiment of the present invention. Figure 3 The invention illustrates a preferred embodiment of a flat tube mating tooling pin holder and socket holder. For example... Figures 1-3 As shown, the flat tube docking fixture of the present invention includes a flat tube pin seat 11 and a flat tube insertion hole seat 12. Both the flat tube pin seat 11 and the flat tube insertion hole seat 12 are provided with two slots of the same size as the flat tube for positioning the flat tube in the circumferential direction; the edge of the slot in the flat tube pin seat 11 has a flat tube insertion end limiting groove 111 for positioning the first flat tube 61 in the axial direction; the edge of the slot in the flat tube insertion hole seat 12 has a flat tube sleeve end limiting groove 121 for positioning the second flat tube 64 in the axial direction.
[0015] The flat tube butt fitting also includes a flat tube clamp base hinge 41, which is connected to the flat tube pin seat 11 and the flat tube insertion hole seat 12 respectively. A flat tube clamp 42 is connected to the flat tube clamp base hinge 41 via a pin. One end of the flat tube clamp 42 is connected to the flat tube clamp base hinge 41, and the other end is connected to the clamp fixing studs 43 on the flat tube pin seat 11 and the flat tube insertion hole seat 12 via clamp fixing nuts 44, for fastening the flat tube. The flat tube clamp 42 has two slots of the same size as the flat tube for radial positioning of the flat tube. A 1mm thick rubber pad is provided on the slots to protect the smoothness of the flat tube surface.
[0016] The clamp fixing stud 43 is connected to the flat tube pin seat 11 and the flat tube insertion hole seat 12, and can be inserted into the fixing hole of the flat tube clamp 42. The clamp fixing nut 44 is connected to the clamp fixing stud 43 to tighten the flat tube clamp 42, ensuring that the first flat tube 61 and the second flat tube 64 are fixed on the flat tube pin seat 11 and the flat tube insertion hole seat 12 for positioning of the flat tube in the radial direction.
[0017] The mating pin 5 is connected to the flat tube pin seat 11. During flat tube mating, the mating pin 5 on the flat tube pin seat 11 is inserted into the pin hole of the flat tube insertion seat 12 to ensure the horizontal and vertical accuracy of the flat tube mating. When the mating pin 5 is fully inserted into the pin hole, the contact pressure sensor on the mating pin 5 touches the bottom of the pin hole, and the contact pressure sensor sends a signal to stop the drive motor 3 from rotating.
[0018] The flat tube docking fixture also includes a lead screw and nut assembly 2, one end of which is fixedly connected to the flat tube pin seat 11, and the other end is fixedly connected to the flat tube insertion hole seat 12. The lead screw and nut assembly 2 is equipped with a drive motor 3. The drive motor 3 has a push-button switch 31 that can control the motor to rotate forward, reverse, and stop.
[0019] The flat tube docking fixture also includes a sliding guide rail seat 71 and a linear slide rail 72. The sliding guide rail seat 71 is fixedly connected to the flat tube pin seat 11 and the flat tube insertion hole seat 12, respectively. The linear slide rail 72 is connected to the sliding guide rail seats 71 at both ends to ensure that the flat tube pin seat 11 and the flat tube insertion hole seat 12 move horizontally in a straight line. The linear slide rail 72 is equipped with a limit device to ensure product safety.
[0020] The flat tube docking fixture also includes a flat tube insertion end 62 and a flat tube sleeve end 63. By accurately and reliably inserting the flat tube insertion end 62 into the bottom of the flat tube sleeve end 63, the pipes of the first flat tube 61 and the second flat tube 64 are accurately docked, the inner cavity is tightly connected, and the sealing performance is good.
[0021] Figure 4 The diagram shown is a schematic diagram of a flat tube connection structure according to a preferred embodiment of the present invention. Figure 4 The diagram shows a cross-sectional view of the flat pipe butt joint inserted horizontally into the sleeve end of the flat pipe, indicating that the flat pipes are properly joined. Figure 4 As shown, during the flat tube docking process, it is necessary to ensure that the horizontality of the lumens on both sides of the flat tube is consistent when the first flat tube 61 and the second flat tube 64 are docked.
[0022] refer to Figures 1-4 The method for precise docking of flat tubes according to the present invention includes: when the operator needs to dock flat tubes, pressing the reverse button 31 drives the motor 3 to reverse the screw nut pair 2 to drive the flat tube pin seat 11 to move horizontally and linearly away from the flat tube insertion hole seat 12 along the direction of the linear slide rail 72, so that the flat tube clamp 42 on the flat tube pin seat 11 is aligned with the second flat tube 64, the flat tube clamp 42 on the flat tube pin seat 12 is aligned with the first flat tube 61, and the flat tube insertion end limiting groove 111 is aligned with the flat tube insertion end 62. When the flat tube sleeve end limiting groove 121 is aligned with the flat tube sleeve end 63, the button switch 31 is pressed to turn off the motor 3, thus achieving precise insertion of the flat tube insertion end 62 into the bottom of the flat tube sleeve end 63, so as to ensure precise docking of the flat tubes 61 and 62, tight connection of the inner cavity of the pipes, and good sealing performance.
[0023] Open the two flat pipe clamps 42 on the flat pipe pin seat 11 and the flat pipe insertion hole seat 12, and install the first flat pipe 61 to be connected into the flat pipe groove on the flat pipe pin seat 11 to ensure the circumferential positioning of the first flat pipe 61; the flat pipe insertion end 62 is installed in the flat pipe insertion end limiting groove 111, and the first flat pipe 61 and the flat pipe insertion end 62 are a whole pipe. The second flat pipe 64 and the flat pipe sleeve end 63 are a whole pipe. When the flat pipe insertion end 62 is inserted into the bottom of the flat pipe sleeve end 63, it indicates that the pipe connection is complete. The flat tube insertion end 62 is aligned with the flat tube insertion end limiting groove 111 to ensure the completion of the axial installation of the first flat tube 61 and the axial positioning of the first flat tube 61; the second flat tube 64 to be connected is installed in the flat tube slot of the flat tube insertion hole seat 12 to ensure the circumferential positioning of the second flat tube 64; the flat tube sleeve end 63 is installed in the flat tube sleeve end limiting groove 121 to ensure the axial positioning of the second flat tube 64.
[0024] Then, insert the flat tube clamp 42 into the clamp fixing stud 43 and tighten the clamp fixing nut 44 to ensure the radial positioning of the first flat tube 61 and the second flat tube 64. This allows the first flat tube 61 and the flat tube pin seat 11 and the second flat tube 64 and the flat tube insertion hole seat 12 to be fixed on the flat tube docking base with consistent horizontality.
[0025] At this time, pressing the docking button switch 31 causes the motor 3 to rotate forward and the lead screw nut pair 2 to rotate forward, driving the flat tube pin seat 11 to move horizontally and linearly along the direction of the linear slide rail 72 towards the flat tube insertion hole seat 12, so that the flat tube pin seat 11 moves towards the flat tube insertion hole seat 12 until the docking pin 5 on the flat tube pin seat 11 is inserted into the pin hole of the flat tube insertion hole seat 12.
[0026] When the mating seat pin 5 is fully inserted into the pin hole, the contact pressure sensor on the mating seat pin 5 touches the bottom of the pin hole, and the contact pressure sensor sends a signal to stop the drive motor 3 from rotating. This achieves the automatic docking of the first flat tube 61 and the second flat tube 64 with the flat tube insert end 62 inserted horizontally into the flat tube sleeve end 63, and the horizontal alignment of the two sides of the docked flat tube.
[0027] This process can also correct the horizontality of flat tubes that are uneven or twisted. After the connection is completed, unscrew the clamp fixing nut 44 on the clamp fixing stud 43, loosen the flat tube clamp 42, and then remove the flat tube pin seat 11 and flat tube insertion hole seat 12 to dismantle the flat tube connection fixture. When the flat tube connection is completed, press the reverse button to reset the flat tube connection fixture to its initial state.
[0028] Currently, the process of flat tube docking is complex and lacks specific measuring tools, requiring specialized senior technicians to operate it, which cannot meet the current high-density task requirements.
[0029] The first major breakthrough of this invention is the use of two slots, each matching the size of the flat tube, on both the flat tube pin seat and the flat tube insertion seat to ensure the circumferential positioning of the flat tube. A flat tube insertion end limiting groove is located at the edge of the slot in the flat tube pin seat for axial positioning; a flat tube sleeve end limiting groove is located at the edge of the slot in the flat tube insertion seat for axial positioning; and two slots, matching the size of the flat tube, are provided on the flat tube clamp for radial positioning. Fixing the flat tube to the docking platform allows for the application of various twisted flat tubes, ensuring the horizontality of the flat tube. Furthermore, a 1mm thick rubber pad is provided on the slots of the flat tube clamp to protect the smoothness of the flat tube surface.
[0030] The second major breakthrough of this invention is the use of a linear guide rail and a lead screw and nut assembly to ensure that the flat tube butt welding fixture moves in a straight line during the butt welding process. Pins on both sides ensure the horizontal and vertical accuracy of the flat tube butt welding, achieving precise butt welding of the cavities on both sides of the flat tube. It also provides a horizontal correction function for the flat tube. The linear guide rail limiting device and contact pressure sensor of this invention ensure uniform external force on the flat tube, guaranteeing the safety of personnel and products. This invention overcomes the shortcomings of existing technologies. The operation is simple and comfortable via buttons, convenient, safe, and reliable. It can adapt to the installation of flat tubes in confined spaces, and the horizontality can be adjusted according to different shapes of flat tubes. It can effectively achieve precise butt welding of flat tubes, demonstrating good practicality and potential for widespread application.
[0031] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.
Claims
1. A flat pipe butt welding fixture, characterized in that, It includes a flat tube pin seat (11), a flat tube insertion hole seat (12), a screw nut pair (2), and a sliding guide seat (71). The flat tube pin seat (11) and the flat tube insertion hole seat (12) are respectively provided with two slots that are the same size as the flat tube, which are used for positioning the flat tube in the circumferential direction. There is a flat tube insertion end limiting groove (111) at the edge of the slot of the flat tube pin seat, which is used for positioning the first flat tube (61) in the axial direction. There is a flat tube sleeve end limiting groove (121) at the edge of the slot of the flat tube insertion hole seat, which is used for positioning the second flat tube (64) in the axial direction. Flat tube pin seat (11) and flat tube insertion hole seat (12) are respectively provided with flat tube clamp base hinge (41). Flat tube clamp (42) is connected to flat tube clamp base hinge (41) and flat tube clamp (42) by a pin. One end of flat tube clamp base hinge (41) is connected to flat tube clamp base hinge (41), and the other end is connected to flat tube pin seat (11) and flat tube insertion hole seat (12) for fastening flat tube. Flat tube clamp (42) is provided with two slots that are the same size as flat tube for positioning flat tube in the radial direction. The flat tube pin seat (11) is provided with a docking pin (5), which is inserted into the pin hole of the flat tube insertion seat (12) when the flat tubes are docked to ensure the horizontal and vertical accuracy of the docking. One end of the lead screw nut assembly (2) is fixedly connected to the flat tube pin seat (11), and the other end is fixedly connected to the flat tube insertion hole seat (12). The sliding guide seat (71) is fixedly connected to the flat tube pin seat (11) and the flat tube socket seat (12) respectively. The linear slide rail (72) is connected to the sliding guide seat (71) at both ends to ensure that the flat tube pin seat (11) and the flat tube socket seat (12) move horizontally in a straight line.
2. The flat pipe butt welding fixture according to claim 1, characterized in that, The flat tube clamp (42) is connected to the clamp fixing stud (43) on the flat tube pin seat (11) and the flat tube insertion hole seat (12) by the clamp fixing nut (44).
3. The flat pipe butt welding fixture according to claim 1, characterized in that, The linear slide rail (72) is equipped with a limit device.
4. The flat pipe butt welding fixture according to claim 1, characterized in that, The slot is equipped with a rubber pad to protect the smoothness of the flat tube surface.
5. The flat pipe butt welding fixture according to claim 1, characterized in that, The lead screw nut assembly (2) is equipped with a drive motor (3). When the mating seat pin (5) is fully inserted into the pin hole, the contact pressure sensor (8) on the mating seat pin (5) touches the bottom of the pin hole, and the contact pressure sensor (8) sends a signal to stop the drive motor (3) from rotating.
6. The flat pipe butt welding fixture according to claim 2, characterized in that, The clamp fixing stud (43) is connected to the flat tube pin seat (11) and the flat tube insertion hole seat (12) and is inserted into the fixing hole of the flat tube clamp (42); the clamp fixing nut (44) is connected to the clamp fixing stud (43) to tighten the flat tube clamp (42) and ensure that the first flat tube (61) and the second flat tube (64) are fixed on the flat tube pin seat (11) and the flat tube insertion hole seat (12) for positioning of the flat tube in the radial direction.
7. The flat pipe butt welding fixture according to claim 5, characterized in that, The drive motor (3) has a push-button switch (31) that can control the motor to rotate forward, reverse, and stop.
8. The flat pipe butt welding fixture according to claim 1, characterized in that, It also includes a flat tube insertion end (62) and a flat tube sleeve end (63). The first flat tube (61) and the flat tube insertion end (62) are an integral pipeline, and the second flat tube (64) and the flat tube sleeve end (63) are an integral pipeline. By inserting the flat tube insertion end (62) into the bottom of the flat tube sleeve end (63), the pipelines of the first flat tube (61) and the second flat tube (64) are accurately connected.
9. A method for precise docking of flat tubes, characterized in that, The flat tube butt welding fixture used in any one of claims 1 to 8 includes the following steps: When the operator needs to connect the flat tube, the screw nut pair (2) reverses and drives the flat tube pin seat (11) to move horizontally and linearly away from the flat tube insertion hole seat (12) along the direction of the linear slide rail (72), so that the flat tube clamp (42) on the flat tube pin seat (11) is installed and aligned with the second flat tube (64), the flat tube clamp (42) on the flat tube pin seat (12) is installed and aligned with the first flat tube (61), and the flat tube insertion end limiting groove (111) is installed and aligned with the flat tube insertion end (62); Open the two flat pipe clamps (42) on the flat pipe pin seat (11) and the flat pipe socket seat (12), install the first flat pipe (61) to be connected into the flat pipe groove on the flat pipe pin seat (11), install the second flat pipe (64) to be connected into the flat pipe groove on the flat pipe socket seat (12), and then insert the flat pipe clamp (42) into the clamp fixing stud (43) and tighten the clamp fixing nut (44). The screw nut assembly (2) rotates forward, driving the flat tube pin seat (11) to move horizontally and linearly along the direction of the linear slide rail (72) towards the flat tube insertion hole seat (12), so that the flat tube pin seat (11) moves towards the flat tube insertion hole seat (12) until the mating pin (5) on the flat tube pin seat (11) is inserted into the pin hole of the flat tube insertion hole seat (12), and the first flat tube (61) and the second flat tube (64) automatically mate.