Expansion block type pipe connecting structure and connecting method

Abstract

The invention discloses an expansion block type pipe connecting structure and a connecting method.The expansion block type pipe connecting structure comprises a connector, an expansion block, a jackscrew and a connecting pipe, the position, facing the end face of the connecting pipe, of a connector body is provided with two or more butt joint faces; a fixing plug is arranged on the butt joint face, the tensioning block is installed on the inner side wall of the fixing plug in a matched mode, and the outer contour of the cross section of the tensioning block and the outer contour of the cross section of the fixing plug are matched with the contour of an inner hole of the connecting pipe. A via hole is formed in the outer wall of the end of the connecting pipe, a jackscrew threaded hole is formed in the middle of the fixing plug, the jackscrew penetrates through the via hole to be in threaded connection with the jackscrew threaded hole, and the inner end of the jackscrew abuts against the inner side wall of the tensioning block. The tensioning block is matched with the fixing plug to fix the connecting pipe in a tensioning mode, implementation is easy, and cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of modular furniture frame, in particular to a bulging block type pipe connecting structure and connecting method. BACKGROUND

[0002] Modular furniture is a kind of customized furniture with unique characteristics formed by free combination according to specific needs of customers through modular design. The size and function of modular furniture can be flexibly changed according to the needs of customers, and it is mainly through personalized assembly of standard spare parts to meet the needs of users, which is suitable for various cabinet furniture.

[0003] Among many modular furniture, the Swedish modular furniture brand USM is a representative of top quality and excellent design in the furniture industry, so that the USM modular furniture gradually becomes an outstanding representative of modular furniture. USM applies the concept of architecture, takes spare parts as the core, uses connecting pieces + steel pipes as the structural center of gravity, and adds steel plates, door plates and spare parts to form a complete cabinet. Among them, the chromium-plated ball as a connecting piece has become a symbolic part of USM furniture, and the chromium-plated ball is the key part to realize various customized creations.

[0004] However, the expansion sleeve structure used in cooperation with the chromium-plated ball in the USM furniture accessory is complex, and a long hexagonal wrench is needed to tighten and disassemble from the round pipe. If the round pipe is relatively long, the operation is not very convenient. Moreover, the expansion sleeve structure is complex, usually including a compound sleeve and a tapered rod, which moves axially to expand and complete the fixed connection from the inside of the steel pipe. This complex structure is not conducive to reducing production cost.

[0005] In order to overcome the above problems, a bulging block type pipe connecting structure is needed. SUMMARY

[0006] The purpose of the present application is to provide a bulging block type pipe connecting structure, which uses a bulging block to cooperate with a fixed plug to achieve fixed connection of the pipe, which is easy to realize and has low cost.

[0007] To solve the above technical problems, the technical scheme is as follows: The bulging block type pipe connecting structure comprises a connecting head, a bulging block, a jack and a connecting pipe. The connecting head body is provided with a butt joint surface at the position facing the end face of the connecting pipe, and the number of the butt joint surfaces is two or more. A fixed plug is arranged on the butt joint surface. The bulging block is adaptively installed on the inner side wall of the fixed plug, and the cross section outer contour of the bulging block and the inner hole contour of the connecting pipe are adapted. A through hole is formed on the outer wall of the end part of the connecting pipe, a jack screw thread hole is formed in the middle of the fixed plug, and the jack is threadedly connected to the jack screw thread hole through the through hole, and the inner end head abuts against the inner side wall of the bulging block.

[0008] The applicant has long been engaged in the production and processing of cabinet furniture cabinets, and is currently developing a simplified connection structure to replace the USM module. The structure is simple and easy to implement, and the connection strength is guaranteed.

[0009] Further, the limiting structure is arranged between the fixed plug and the tensioning block to reduce the loosening of the tensioning block during assembly.

[0010] Further, the limiting structure includes a guide screw, the fixed plug has a guide threaded hole, and the inner side wall of the tensioning block has a guide hole coaxially arranged at the position of the guide threaded hole; the guide screw is threadedly connected in the guide threaded hole and has an inner end head gap-fitted into the guide hole.

[0011] Further, the inner side wall of the tensioning block has a jacking pit coaxially arranged at the position of the jacking screw threaded hole, and the inner end head of the jacking screw is abutted into the jacking pit.

[0012] Further, the connecting pipe is a square pipe, and two through holes are arranged on two adjacent side walls at the end of the connecting pipe.

[0013] Currently, the applicant mainly uses a square pipe form, performs 3D printing, and conducts experimental verification, which shows that good connection strength can be achieved.

[0014] Further, the limiting structure includes a guide groove and a clamping protrusion, two guide grooves are symmetrically arranged on the narrow side wall of the fixed plug, and two clamping protrusions are symmetrically arranged on the inner side of the supporting leg of the tensioning block. The clamping protrusion can slide in the guide groove.

[0015] Further, the width of the clamping protrusion is less than the width of the guide groove.

[0016] Further, the limiting structure includes a guide column and a guide hole, the guide column is vertically arranged on the inner side wall of the fixed plug, and the guide hole is arranged on the inner side wall of the tensioning block and coaxially guided with the guide column.

[0017] Further, it further includes a clamping spring, the outer side wall and one side narrow wall of the fixed plug are provided with an L-shaped first clamping spring slot, and the outer side wall and one side narrow wall of the tensioning block are provided with an L-shaped second clamping spring slot; the clamping spring is hiddenly clamped in the first clamping spring slot and the second clamping spring slot to tightly hold the tensioning block to the fixed plug.

[0018] The present invention also discloses a method for connecting expansion block type pipes, which uses the expansion block type pipe connection structure described in any of the above claims to expand and tighten the connection between the connector and the connecting pipe.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are as follows: This invention relates to an expansion block type pipe connection structure. By employing an expansion block and a fixing plug that are adapted to the inner bore contour of the connecting pipe, a reliable and secure connection between the connecting pipe and the connector can be achieved. The set screw passes through a through hole and is threaded into the threaded hole, with its inner end abutting against the inner wall of the expansion block. This ensures that the outer walls of the expansion block and the fixing plug are pressed against the inner wall of the connecting pipe, while the set screw is locked into the through hole, forming a reliable locking relationship. This expansion block type pipe connection structure uses an expansion block and a fixing plug to tighten and secure the connecting pipe, which is easy to implement and has low cost.

[0020] Furthermore, by adding the guide screw and guide hole, the tensioning block can be prevented from loosening and sliding deeper into the inner hole of the connecting pipe during the connection and assembly process, thus avoiding insecure tensioning. The addition of a tightening pit limits the inner end of the set screw, preventing the tensioning block from swinging around the guide screw during the tightening process. Adding teeth to the outer walls of the fixed plug and tensioning block significantly increases the connection strength between the fixed plug and tensioning block and the inner wall of the connecting pipe, preventing detachment. By setting the guide groove and retaining protrusion, the tensioning block can be installed onto the fixed plug first during assembly, preventing easy detachment, and then the connecting pipe can be installed uniformly, avoiding the need to clamp the tensioning block and fixed plug together with fingers during pipe installation, thus improving assembly efficiency. Compared to using guide screws, directly forming the guide post during die casting eliminates the screw-tightening process during assembly, further improving assembly efficiency. By adding a retaining ring and concealing it in the first and second retaining ring slots, the tensioning block can be temporarily fixed before installation without affecting the tensioning connection. When inserting the end of the connecting pipe, there is no need to use fingers to clamp the tensioning block and the fixed plug combination, which also improves the efficiency of the assembly operation.

[0021] The expansion block tube connection method of the present invention adopts a dual connection method of tensioning block and locking screw to connect the tube to the fixed plug to achieve a reliable connection between the tube and the connector. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of the expansion block tube connection structure of the present invention; Figure 2 This is an exploded three-dimensional structural diagram of Embodiment 1 of the expansion block tube connection structure of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the connector in Example 1; Figure 4 This is a three-dimensional structural diagram of the connector from another angle in Example 1; Figure 5 This is a schematic diagram of the three-dimensional structure of the tensioning block in Example 1; Figure 6 This is a three-dimensional structural diagram of the tensioning block from another angle in Example 1; Figure 7 This is a three-dimensional structural diagram of another form of the connector in Example 1; Figure 8 This is a three-dimensional structural schematic diagram of Embodiment 2 of the expansion block tube connection structure of the present invention; Figure 9 This is an exploded three-dimensional structural diagram of Embodiment 2 of the expansion block tube connection structure of the present invention; Figure 10 This is a three-dimensional structural schematic diagram of Embodiment 3 of the expansion block tube connection structure of the present invention; Figure 11 This is an exploded three-dimensional structural diagram of Embodiment 3 of the expansion block tube connection structure of the present invention; Figure 12 This is a schematic diagram of the three-dimensional structure of the connector in Example 3; Figure 13 This is a three-dimensional structural diagram of the connector from another angle in Example 3.

[0024] Explanation of reference numerals in the attached drawings: 1. Connector; 101. Butt joint surface; 102. Fixed plug; 1021. First tooth surface; 1022. Set screw threaded hole; 1023. Guide threaded hole; 1024. Guide groove; 1025. First snap ring groove; 1026. Guide post; 2. Tensioning block; 201. Second tooth surface; 202. Tensioning pit; 203. Guide hole; 204. Snap ring protrusion; 205. Second snap ring groove; 3. Connecting pipe; 301. Through hole; 4. Snap ring. Detailed Implementation

[0025] The core of this invention is to provide an expansion block type pipe connection structure, which uses an expansion block in conjunction with a fixing plug to fix the connecting pipe through an expansion method. This is easy to implement and has a low cost.

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Refer to the attached diagram. Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of the expansion block tube connection structure of the present invention; Figure 2 This is an exploded three-dimensional structural diagram of Embodiment 1 of the expansion block tube connection structure of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the connector in Example 1; Figure 4 This is a three-dimensional structural diagram of the connector from another angle in Example 1; Figure 5 This is a schematic diagram of the three-dimensional structure of the tensioning block in Example 1; Figure 6 This is a three-dimensional structural diagram of the tensioning block from another angle in Example 1; Figure 7 This is a three-dimensional structural diagram of another form of the connector in Example 1; Figure 8 This is a three-dimensional structural schematic diagram of Embodiment 2 of the expansion block tube connection structure of the present invention; Figure 9 This is an exploded three-dimensional structural diagram of Embodiment 2 of the expansion block tube connection structure of the present invention; Figure 10 This is a three-dimensional structural schematic diagram of Embodiment 3 of the expansion block tube connection structure of the present invention; Figure 11 This is an exploded three-dimensional structural diagram of Embodiment 3 of the expansion block tube connection structure of the present invention; Figure 12 This is a schematic diagram of the three-dimensional structure of the connector in Example 3; Figure 13 This is a three-dimensional structural diagram of the connector from another angle in Example 3.

[0029] Example 1 In the specific implementation of this first embodiment, as follows Figures 1 to 7 As shown, the expansion block type pipe connection structure of the present invention includes a connector 1, a tensioning block 2, a set screw, and a connecting pipe 3. A mating surface 101 is provided on the body of the connector 1 facing the end face of the connecting pipe 3. The outer contour of the mating surface 101 is consistent with the cross-sectional contour of the connecting pipe 3, and there are two or more mating surfaces 101. The number of mating surfaces 101 is consistent with the number of connecting pipes 3 that the connector 1 needs to connect, and is related to the node position of the connector 1 in the space of the modular furniture. For example, Figure 3 and Figure 4 For a connector 1 including two mating surfaces 101, and Figure 7 This is a connector 1 that includes three mating surfaces 101.

[0030] A fixed plug 102 is integrally provided on each mating surface 101. The tensioning block 2 is adapted to be installed on the inner side wall of the fixed plug 102, and the outer contour of their cross-sections is adapted to the inner contour of the connecting pipe 3. A through hole 301 is provided on the outer wall of the end of the connecting pipe 3. A set screw threaded hole 1022 is provided in the middle of the fixed plug 102. The set screw passes through the through hole 301 and is threaded to the set screw threaded hole 1022, and its inner end abuts against the inner side wall of the tensioning block 2.

[0031] By employing a combination of a tensioning block 2 and a fixing plug 102 that adapts to the inner bore contour of the connecting pipe 3, the connecting pipe 3 and the connector 1 can be reliably and securely connected. After the set screw passes through the through hole 301, it is threaded into the set screw threaded hole 1022, with its inner end abutting against the inner wall of the tensioning block 2. This ensures that the outer walls of the tensioning block 2 and the fixing plug 102 are pressed against the inner wall of the connecting pipe 3, while the set screw is locked into the through hole 301, forming a reliable locking relationship. This invention's expansion block type pipe connection structure, using a tensioning block in conjunction with a fixing plug for tensioning and fixing the connecting pipe, is easy to implement and has low cost.

[0032] In one specific implementation of this embodiment, such as Figures 1 to 7 As shown, the expansion block type tube connection structure in this embodiment also includes a limiting structure, which is set between the fixed plug 102 and the tensioning block 2 to reduce the possibility of the tensioning block 2 becoming loose during assembly.

[0033] Specifically, such as Figures 1 to 7 As shown, the limiting structure includes a guide screw, a guide threaded hole 1023 is provided on the fixing plug 102, and a guide hole 203 is coaxially provided on the inner side wall of the tensioning block 2 at the position of the guide threaded hole 1023. The guide hole 203 is a blind hole, and the guide screw is threaded into the guide threaded hole 1023 with its inner end head inserted into the guide hole 203 with clearance fit.

[0034] Specifically, such as Figure 3 and Figure 7 As shown, the guide thread hole 1023 is a countersunk hole, and the bolt head of the guide screw is completely recessed into the countersunk hole.

[0035] By adding the guide screw and guide hole 203, it is possible to prevent the tensioning block 2 from loosening and sliding into the inner hole of the connecting pipe 3 during the connection and assembly process, thus avoiding unreliable tensioning.

[0036] In one specific implementation of this embodiment, such as Figure 2 and Figure 6 As shown, a tightening pit 202 is coaxially formed on the inner side wall of the tensioning block 2 at the position of the set screw threaded hole 1022. The tightening pit 202 is a conical pit, and the inner end of the set screw is pressed against the tightening pit 202.

[0037] By adding a tightening pit 202 to limit the inner end of the set screw, the tensioning block 2 is prevented from swinging around the guide screw during the tightening process of the set screw.

[0038] In one specific implementation of this embodiment, such as Figure 1 and Figure 2 As shown, the connecting pipe 3 is a square tube, and two through holes 301 are provided on two adjacent side walls at the ends of the connecting pipe 3. During the assembly of the modular furniture frame, the square tube connecting pipe 3 is set at a 45-degree angle.

[0039] Obviously, the connecting pipe 3 can also be a round pipe or other regular prism pipe, and the corresponding fixing plug 102 and tensioning block 2 can be set in a split manner. Similar simple replacement methods all fall within the protection scope of this invention.

[0040] Specifically, such as Figures 2 to 5 and Figure 7 As shown, the outer walls of the fixed plug 102 and the tensioning block 2 are respectively configured as the first tooth surface 1021 and the second tooth surface 201. The direction of the tooth crest line is set along the side length direction of the connecting tube 3.

[0041] By adding teeth to the outer walls of the fixed plug 102 and the tensioning block 2, the connection strength between the fixed plug 102 and the tensioning block 2 and the inner wall of the connecting pipe 3 can be significantly increased, thus preventing them from falling off.

[0042] The working principle of the expansion block type pipe connection structure in this embodiment is as follows: During installation, first, the guide screw is threaded into the guide thread hole 1023, and the bolt head of the guide screw is recessed into the countersunk hole. The tensioning blocks 2 are stacked face-to-face on the inner wall of the fixing plug 102, ensuring that the guide hole 203 fits onto the protruding part of the guide screw. The tensioning block 2 and the fixing plug 102 assembly are clamped together with fingers, ensuring their inner walls are pressed tightly. The end of the connecting pipe 3 is then fitted onto the tensioning block 2 and the fixing plug 102 assembly, ensuring that the through hole 301 and the set screw thread hole 1022 are aligned. The set screw is installed, passing through the through hole 301 and threaded into the set screw thread hole 1022, with the inner end of the set screw abutting against the tightening pit 202 on the inner wall of the tensioning block 2. The set screw is then tightened further using a wrench. The set screw expands the tension block 2 and the fixing plug 102, so that the first tooth surface 1021 and the second tooth surface 201 are respectively clamped into the inner wall of the connecting tube 3, increasing the connection strength.

[0043] Example 2 Based on the above embodiment 1, the specific form of the limiting structure is improved to form this embodiment.

[0044] like Figure 8 and Figure 9As shown, the limiting structure includes guide grooves 1024 and locking protrusions 204. The two guide grooves 1024 are symmetrically arranged along their length on the narrow sidewall of the fixing plug 102. The two locking protrusions 204 are symmetrically arranged along their length on the inner side of the narrow sidewall, near the support leg of the tensioning block 2. The locking protrusions 204 can slide within the guide grooves 1024. The fit clearance between the guide grooves 1024 and the locking protrusions 204 is small, preventing them from easily slipping off.

[0045] Specifically, such as Figure 8 and Figure 9 As shown, the width of the protruding strip 204 is smaller than the width of the guide groove 1024, which means that the tensioning block 2 can approach and move away from the fixed plug 102 within a certain margin.

[0046] By setting the guide groove 1024 and the locking protrusion 204, the tensioning block 2 can be installed onto the fixed plug 102 first during the assembly process, and it will not easily fall off. Then the connecting pipe 3 is installed uniformly, avoiding the need to clamp the tensioning block 2 and the fixed plug 102 with fingers during the installation of the connecting pipe 3, thus improving the assembly efficiency.

[0047] Example 3 Based on the above embodiment 1, the specific form of the limiting structure is further improved to form this embodiment.

[0048] In the specific implementation of this first embodiment, as follows Figures 10 to 13 As shown, the limiting structure includes a guide post 1026 and a guide hole 203. The guide post 1026 is vertically disposed on the inner sidewall of the fixed plug 102 and is integrally formed. The guide hole 203 is formed on the inner sidewall of the tensioning block 2 and is coaxially guided and engaged with the guide post 1026.

[0049] Specifically, connector 1 is die-cast from aluminum alloy or stainless steel, and guide post 1026 is integrally formed during the casting process.

[0050] Compared to using guide screws, the guide post 1026 is formed directly during the die casting process, which eliminates the screw tightening process during assembly and improves assembly efficiency.

[0051] In one specific implementation of this embodiment, such as Figures 10 to 13 As shown, the expansion block type tube connection structure in this embodiment also includes a retaining ring 4. An L-shaped first retaining ring groove 1025 is formed on the outer wall and one narrow wall of the fixed plug 102, and an L-shaped second retaining ring groove 205 is formed on the outer wall and one narrow wall of the tensioning block 2. The first retaining ring groove 1025 and the second retaining ring groove 205 are aligned. The retaining ring 4 is concealed and snapped into the first retaining ring groove 1025 and the second retaining ring groove 205 to hold the tensioning block 2 tightly onto the fixed plug 102.

[0052] By adding a retaining ring 4 and concealing it in the first retaining ring groove 1025 and the second retaining ring groove 205, the tensioning block 2 can be temporarily fixed before installation without affecting the tensioning connection. When inserting the end of the connecting tube 3, it is no longer necessary to use fingers to clamp the tensioning block 2 and the fixing plug 102 combination, which also improves the efficiency of the assembly operation.

[0053] The working principle of the expansion block type pipe connection structure in this embodiment is as follows: During installation, firstly, place the expansion blocks 2 face-to-face on the inner wall of the fixed plug 102, ensuring that the guide hole 203 fits into the guide post 1026 and that the first snap ring groove 1025 and the second snap ring groove 205 are aligned. Use your fingers to clamp the expansion blocks 2 and the fixed plug 102 assembly, keeping their inner walls close together. Pinch the snap ring 4 and insert it into the first snap ring groove 1025 and the second snap ring groove 205, thus securing the expansion blocks 2 onto the fixed plug 102. This completes the temporary fixation of the expansion blocks 2 on all mating surfaces 101. Then, attach the end of the connecting pipe 3 to the expansion blocks 2 and the fixed plug 102 assembly, ensuring that the through hole 301 and the set screw threaded hole 1022 are aligned. Install the set screw, which passes through the through hole 301 and is threaded into the set screw threaded hole 1022. The inner end of the set screw abuts against the tightening pit 202 on the inner wall of the expansion blocks 2. Use a wrench to continue tightening the set screw. The set screw expands the tension block 2 and the fixing plug 102, so that the first tooth surface 1021 and the second tooth surface 201 are respectively clamped into the inner wall of the connecting tube 3, increasing the connection strength.

[0054] In summary, the expansion block type pipe connection structure of the present invention, by employing a combination of a tensioning block 2 adapted to the inner bore contour of the connecting pipe 3 and a fixing plug 102, can reliably and securely connect the connecting pipe 3 and the connector 1. After the set screw passes through the through hole 301 and is threaded into the set screw threaded hole 1022, with its inner end abutting against the inner wall of the tensioning block 2, the outer walls of the tensioning block 2 and the fixing plug 102 can be pressed against the inner bore wall of the connecting pipe 3, while the set screw is locked into the through hole 301, forming a reliable locking relationship. The expansion block type pipe connection structure of the present invention, using a tensioning block in conjunction with a fixing plug to tighten and fix the connecting pipe, is easy to implement and has low cost. Furthermore, by adding the guide screw and guide hole 203, it is possible to prevent the tensioning block 2 from loosening and sliding deeper into the inner bore of the connecting pipe 3 during the connection and assembly process, thus avoiding unreliable tightening. By adding a tightening pit 202 to limit the inner end of the set screw, the tensioning block 2 is prevented from swinging around the guide screw during the tightening process. Adding teeth to the outer walls of the fixed plug 102 and the tensioning block 2 significantly increases the connection strength between the fixed plug 102 and the tensioning block 2 and the inner wall of the connecting pipe 3, preventing detachment. By setting the guide groove 1024 and the retaining protrusion 204, the tensioning block 2 can be installed onto the fixed plug 102 first during assembly, preventing easy detachment, and then the connecting pipe 3 can be installed uniformly. This avoids the need to clamp the tensioning block 2 and the fixed plug 102 with fingers during the installation of the connecting pipe 3, improving assembly efficiency. Compared to using guide screws, directly die-casting the guide post 1026 eliminates the screw-tightening process during assembly, further improving assembly efficiency. By adding a retaining ring 4 and concealing it in the first retaining ring groove 1025 and the second retaining ring groove 205, the tensioning block 2 can be temporarily fixed before installation without affecting the tensioning connection. When inserting the end of the connecting tube 3, it is no longer necessary to use fingers to clamp the tensioning block 2 and the fixing plug 102 combination, which also improves the efficiency of the assembly operation.

[0055] This invention also discloses a method for connecting a tube using an expansion block, which utilizes the expansion block connection structure in any of the above embodiments to expand and tighten the connector 1 and the connecting tube 3. Simultaneously, the set screw connected from the side reliably locks the connector 1 and the connecting tube 3 in place.

[0056] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0057] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A type of expansion block pipe connection structure, characterized in that: The device includes a connector (1), a tensioning block (2), a set screw, and a connecting tube (3). The connector (1) has a mating surface (101) facing the end face of the connecting tube (3), and there are two or more mating surfaces (101). A fixing plug (102) is provided on the mating surface (101). The tensioning block (2) is adapted to be installed on the inner side wall of the fixing plug (102), and the outer contour of the cross-section of the two is adapted to the inner contour of the connecting tube (3). A through hole (301) is opened on the outer wall of the end of the connecting tube (3). A set screw threaded hole (1022) is opened in the middle of the fixing plug (102). The set screw passes through the through hole (301) and is threaded to the set screw threaded hole (1022), and its inner end abuts against the inner side wall of the tensioning block (2).

2. The expansion block type pipe connection structure according to claim 1, characterized in that: It also includes a limiting structure, which is disposed between the fixed plug (102) and the tensioning block (2) to reduce the possibility of the tensioning block (2) becoming loose during assembly.

3. The expansion block type pipe connection structure according to claim 2, characterized in that: The limiting structure includes a guide screw, the fixed plug (102) has a guide thread hole (1023), and the inner sidewall of the tensioning block (2) has a guide hole (203) coaxially formed at the position of the guide thread hole (1023); the guide screw is threaded in the guide thread hole (1023) and the inner end head is inserted into the guide hole (203) with clearance fit.

4. The expansion block type pipe connection structure according to claim 1, characterized in that: The inner sidewall of the tensioning block (2) is coaxially provided with a tightening pit (202) at the position of the threaded hole (1022) of the set screw, and the inner end of the set screw is pressed against the tightening pit (202).

5. The expansion block type pipe connection structure according to claim 1, characterized in that: The connecting pipe (3) is a square tube, and the two through holes (301) are provided on two adjacent side walls at the ends of the connecting pipe (3).

6. The expansion block type pipe connection structure according to claim 2, characterized in that: The limiting structure includes guide grooves (1024) and locking protrusions (204). The two guide grooves (1024) are symmetrically arranged along the length of the narrow sidewall of the fixed plug (102), and the two locking protrusions (204) are symmetrically arranged along the length of the inner side of the support leg of the tensioning block (2). The locking protrusions (204) can slide within the guide grooves (1024).

7. The expansion block type pipe connection structure according to claim 6, characterized in that, The width of the card protrusion (204) is smaller than the width of the guide groove (1024).

8. The expansion block type pipe connection structure according to claim 2, characterized in that: The limiting structure includes a guide post (1026) and a guide hole (203). The guide post (1026) is vertically disposed on the inner wall of the fixed plug (102), and the guide hole (203) is opened on the inner wall of the tensioning block (2) and is coaxially guided and cooperated with the guide post (1026).

9. The expansion block type pipe connection structure according to claim 8, characterized in that, It also includes a retaining ring (4), and an L-shaped first retaining ring groove (1025) is provided on the outer side wall and one side narrow wall of the fixed plug (102), and an L-shaped second retaining ring groove (205) is provided on the outer side wall and one side narrow wall of the tensioning block (2); the retaining ring (4) is hiddenly engaged with the first retaining ring groove (1025) and the second retaining ring groove (205) to hold the tensioning block (2) tightly to the fixed plug (102).

10. A method for connecting expansion block type pipes, characterized in that, The connector (1) and the connecting pipe (3) are stretched and tightened using the expansion block pipe connection structure according to any one of claims 1 to 9.

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