Convenient steel pipe joint structure without welding connection

Abstract

The invention discloses a welding-free connection convenient steel pipe joint structure, and relates to the technical field of steel pipe joints, the welding-free connection convenient steel pipe joint structure comprises a joint pipe and a connected external steel pipe, two ends of the joint pipe are integrally provided with protruding pipes matched with the internal diameter of the external steel pipe, and the protruding pipes are inserted into the external steel pipe in a penetrating mode. And the joint pipe and the external steel pipe are fixed through the fastening sleeve. According to the convenient steel pipe joint structure without welding connection, through the ingenious mechanical linkage design, the installation efficiency and the operation convenience are remarkably improved. The key point is that the semi-ring sleeve, the clamping shaft and the elastic element cooperate with each other, so that quick connection can be realized without the traditional welding or complex thread fastening process. After the joint pipe is preliminarily butted with the external steel pipe, the rotary table and the eccentric rod can be driven by rotating the rotary knob, the movable block and the clamping shaft are automatically aligned and locked by utilizing the elastic reset characteristic of the spring, and the design avoids the requirements for accurate alignment and strong fixation in traditional installation.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe joints, in particular to a convenient steel pipe joint structure with no welding connection. Background Art

[0002] The convenient steel pipe joint structure with weldless connection is widely used in industrial pipeline systems, construction, mechanical equipment and other fields. Its core function is to replace traditional welding or threaded connection with mechanical connection to improve installation efficiency and reduce maintenance costs. Such joints usually use snaps, bolts, elastic elements or sealing components to achieve fixation and sealing between pipes, which are especially suitable for scenarios that require frequent disassembly or have special requirements for welding processes. In recent years, with the growth of demand for industrial automation and modular assembly, weldless connection technology has gradually become a research hotspot in pipeline engineering, and its design needs to take into account structural stability, sealing performance and ease of operation. However, existing technologies still face many challenges in practical applications, such as the connection process relying on complex tools, the sealing structure is sensitive to changes in working conditions, or there is a lack of adaptive reinforcement mechanism when leakage occurs, resulting in limited system reliability. Currently, common weldless steel pipe joints mostly utilize a single sealing structure, such as a rubber O-ring or metal gasket. Their sealing performance relies on preload and material elasticity, but they are prone to seal failure under complex operating conditions such as dynamic loads, temperature fluctuations, or corrosive media. Furthermore, traditional connection methods often require specialized tools for precise alignment and tightening, making the installation process cumbersome and demanding on operator skill, making them difficult to meet the demands of rapid deployment. Furthermore, existing joints lack active response mechanisms when leaks occur, failing to dynamically enhance sealing performance through structural design or material properties, leading to persistent leakage risks. For example, some joints rely solely on static seals to resist media pressure. Once the seals fail due to wear or aging, they are unable to compensate for gaps, leading to further leakage. Furthermore, while some designs incorporate elastic elements or snap-fit ​​structures, these lack uniform locking force distribution or insufficient reset capability, making them susceptible to loosening over time, further reducing connection reliability. Therefore, there is an urgent need for a weldless connection structure that combines convenient installation with adaptive sealing to address the shortcomings of existing technologies in terms of sealing performance and operational efficiency. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the present invention provides a convenient steel pipe joint structure with weldless connection, which solves the current problems of common weldless steel pipe joints such as a single sealing structure, complex installation, lack of active sealing enhancement mechanism and uneven locking force, which lead to easy failure under complex working conditions, low installation efficiency and poor long-term reliability.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a convenient steel pipe joint structure with no welding connection, comprising a joint pipe and an external steel pipe to be connected, both ends of the joint pipe are integrally formed with a protruding tube that is adapted to the inner diameter of the external steel pipe, the protruding tube is inserted into the external steel pipe, and the joint pipe and the external steel pipe are fixed by a fastening sleeve.

[0005] The locking mechanism is located in the locking cam which is located in the locking cam and is adapted to lock the locking cam and is adapted to lock the locking cam when the locking cam is engaged.

[0006] Preferably, both ends of the semi-ring sleeve are provided with raised blocks, and after the two semi-ring sleeves are combined, the raised blocks on the two semi-ring sleeves are fixed by fastening bolts.

[0007] Preferably, both sides of the opposite ends of the external steel pipe and the joint pipe are provided with clamping holes adapted to the clamping shaft, so that the clamping shaft can be completely inserted into the clamping holes.

[0008] The two half-ring sleeves are fixed by tightening bolts, so that the two half-ring sleeves fix the connection between the joint pipe and the external steel pipe, completing the connection operation of the joint pipe and the external steel pipe.

[0009] Preferably, after the joint pipe and the external steel pipe are connected and the spring is in the reset state, the distance between the joint pipe and the clamping holes on the external steel pipe is greater than the distance between the two clamping shafts. When utilizing the elasticity of the spring 49, the distance between the two clamping shafts 410 is pulled apart to make it equal to the distance between the joint pipe 1 and the clamping hole 6 on the external steel pipe 3. Then the clamping shaft 410 is inserted into the clamping hole 6. After that, the spring 49 is utilized to reset the two clamping shafts 410. The two clamping shafts 410 will pull the joint pipe 1 and the external steel pipe 3 to ensure the sealing and firmness of the connection between the joint pipe 1 and the external steel pipe 3.

[0010] Preferably, the inner wall of the semi-annular sleeve is provided with a layer of rubber sealing gasket, which plays a sealing role to prevent leakage.

[0011] Preferably, the sealing mechanism includes an annular groove 1 arranged on the end face of the joint pipe at the periphery of the raised pipe, the inner wall of the annular groove 1 is provided with a disc spring, and one side of the disc spring is connected to a sealing gasket 1. When the disc spring is in a reset state, the side of the sealing gasket 1 away from the disc spring extends out of the annular groove 1 on the end face of the joint pipe.

[0012] Preferably, the end surface of the sealing gasket 1 away from the disc spring is provided with an annular groove 2, the inner wall of the annular groove 2 is provided with a water-expansion strip, and the sealing gasket 2 is provided on one side of the water-expansion strip. When the water-expansion strip is not expanded, the side of the sealing gasket 2 away from the water-expansion strip is flush with the side of the sealing gasket 1 away from the disc spring.

[0013] Preferably, the inner ring of the first sealing gasket is densely covered with micropores communicating with the second ring groove, and the micropores correspond to the positions of the water-expandable strips.

[0014] Preferably, a slope is provided on the inner lower side of the annular groove 1, and the slope is trumpet-shaped, and its closing end corresponds to the connection between the joint pipe and the external steel pipe.

[0015] In the above technical solution, when the joint pipe and the external steel pipe are installed, under the elasticity of the disc spring, the sealing gasket will press against the end surface of the external steel pipe for a while after the joint pipe and the external steel pipe are installed, thereby playing a sealing role and preventing leakage. When a leak occurs, the water in the pipe will flow out from the gap between the external steel pipe and the raised pipe. When passing the slope, it will flow along the slope into the annular groove 1 on the end face of the joint pipe, and then moisten the water-expanding strip in the annular groove 2 through the micropores. The water-expanding strip will spontaneously expand when it encounters moisture, and during the expansion, it will push the sealing gasket 2 to slide in the annular groove 2 on the end face of the sealing gasket 1, so that the end face of the sealing gasket 2 is tightly fitted to the end face of the external steel pipe, thereby further playing a sealing role and preventing moisture from flowing out.

[0016] Preferably, the sealing gasket 1 and the sealing gasket 2 are both made of stainless steel. Stainless steel has a rust-proof effect and is not prone to deformation and cracking, thereby ensuring the durability of the seal.

[0017] The present invention provides a convenient steel pipe joint structure with no welding connection, which has the following advantages compared with the prior art: This convenient, weld-free steel pipe fitting significantly improves installation efficiency and ease of use through an ingenious mechanical linkage design. Its core principle lies in the synergistic effect of a semi-circular sleeve, a clamping shaft, and an elastic element, enabling quick connection without the need for traditional welding or complex threaded fastening. Once the fitting pipe is initially connected to the external steel pipe, a knob is turned to activate the turntable and eccentric rod. The spring's elastic return property automatically aligns and locks the movable block and clamping shaft. This design eliminates the need for precise alignment and strong fastening required in traditional installation. The operator simply manually turns the knob to insert the clamping shaft into the clamping hole, significantly reducing installation time and labor costs. Furthermore, the combination of the semi-circular sleeve and the raised block allows for local adjustments without disassembling the entire fitting, further enhancing on-site construction flexibility. Furthermore, the modular design allows the fitting components to be pre-assembled and independently tested, reducing on-site assembly complexity and making it particularly suitable for applications where space is limited or frequent disassembly is required. This convenient installation method not only reduces the need for specialized tools and skills, but also significantly improves engineering efficiency, providing a reliable guarantee for the rapid deployment of large-scale pipeline systems.

[0018] 2. This weldless, convenient steel pipe joint achieves superior sealing performance through a multi-level sealing mechanism and intelligent response design. This design proactively strengthens the seal in the event of a leak, ensuring stable and safe system operation. First, the tight fit of gasket 1 against the end face of the external steel pipe provides the first line of defense. The preload of the elastic material effectively handles pressure fluctuations under normal operating conditions. Second, the introduction of a water-swelling strip enhances the sealing system's dynamic response. When a medium (such as water) within the pipe leaks into the joint gap, the water is guided into the annular groove via a sloped structure, triggering the expansion of the expansive material. The expanded water-swelling strip not only fills the existing sealing gap but also pushes gasket 2 to slide within the annular groove, creating a secondary seal and minimizing the risk of leaks. Furthermore, the close fit of gasket 2 against the end face of the external steel pipe further enhances the seal's tightness, preventing secondary leaks caused by media penetration. This seal enhancement mechanism, based on physical and chemical properties, not only overcomes the limitations of traditional sealing materials under dynamic operating conditions, but also achieves adaptive adjustment of sealing performance through structural design, ensuring that the joint maintains a highly effective seal under varying pressure, temperature, or media conditions. Furthermore, the redundant design of the sealing components, such as the combination of multi-layer gaskets and expansion strips, effectively reduces the risk of single points of failure, providing a higher level of reliability for pipeline systems operating under complex conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the fastening sleeve of the present invention; Figure 3 This is a schematic diagram of the internal structure of the housing seat of the present invention; Figure 4 This is a schematic diagram of the connection structure between the joint pipe and the external steel pipe of the present invention; Figure 5 For the present invention Figure 4 A partial enlarged schematic diagram of the structure at point A in the middle.

[0020] In the figure: 1. Connecting pipe; 2. Raised pipe; 3. External steel pipe; 4. Fastening sleeve; 41. Semi-ring sleeve; 42. Shell seat; 43. Limiting groove; 44. Knob; 45. Turntable; 46. Eccentric rod; 47. Moving block; 48. Guide shaft; 49. Spring; 410. Clamping shaft; 411. Raised block; 412. Fastening bolt; 5. Sealing mechanism; 51. Ring groove 1; 52. Disc spring; 53. Sealing gasket 1; 54. Ring groove 2; 55. Water expansion strip; 56. Sealing gasket 2; 57. Slope; 58. Micropore; 6. Clamping hole. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-Figure 5 , the present invention provides three technical solutions: Example 1 See also Figure 1 In an embodiment of the present invention, a convenient steel pipe joint structure with no welding connection includes a joint pipe 1 and an external steel pipe 3 to be connected. Both ends of the joint pipe 1 are integrally formed with a protruding pipe 2 that is adapted to the inner diameter of the external steel pipe 3. The protruding pipe 2 is inserted into the external steel pipe 3 and fixed to the joint pipe 1 and the external steel pipe 3 by a fastening sleeve 4. The fastening sleeve 4 adopts a double semi-ring nested structure to achieve 360° uniform pressure and avoid the stress concentration problem of traditional unilateral bolt fixing. Its innovation lies in converting the traditional welding process into a purely mechanical snap-on connection, and realizing rapid assembly and disassembly through modular component design.

[0023] See also Figure 1-Figure 3In the embodiment of the present invention, the fastening sleeve 4 includes two semi-ring sleeves 41, which are sleeved at the connection between the joint pipe 1 and the external steel pipe 3, and a shell seat 42 is provided in the middle of the outer arc surface of the semi-ring sleeve 41. The shell seat 42 is made of lightweight aluminum alloy and has an internal integrated mechanical transmission mechanism to achieve accurate transmission of the operating torque. The inner arc surface of the semi-ring sleeve 41 is provided with a limiting groove 43 that communicates with the interior of the shell seat 42, and a knob 44 is provided on the side of the shell seat 42 away from the semi-ring sleeve 41. The surface of the knob 44 is anti-slip and frosted, and an operating angle indicator line is provided to reduce the risk of misoperation. One end of the knob 44 is located in the shell seat 42 and is connected to a turntable 45. The side of the turntable 45 away from the knob 44 is symmetrical with its center of circle as the symmetrical point, and is symmetrically hinged with two eccentric rods 46. The eccentric rod 46 adopts high Made of high-strength titanium alloy, it can withstand a maximum axial thrust of 3000N while ensuring lightweight. The other end of the eccentric rod 46 is hinged with a moving block 47. Both ends of the moving block 47 are horizontally slidably interspersed with a guide shaft 48. The guide shaft 48 is treated with ceramic coating and has a friction coefficient of less than 0.15 to ensure smooth sliding of the moving block 47. The other end of the guide shaft 48 is connected to the inner side of the shell seat 42, and the outer sleeve of the guide shaft 48 is provided with a spring 49. The spring 49 adopts a variable stiffness design, providing a preload of 200N in the initial stage and a locking force of up to 800N when fully loaded. The two ends of the spring 49 are respectively connected to one side of the moving block 47 and the inner side of the shell seat 42. One side of the moving block 47 is connected to a card shaft 410 corresponding to the limit slot 43, and the other end of the card shaft 410 slides horizontally and extends out of the limit slot 43.

[0024] See also Figure 2 In the embodiment of the present invention, both ends of the semi-ring sleeve 41 are provided with a protruding block 411. After the two semi-ring sleeves 41 are combined, the protruding blocks 411 on the two semi-ring sleeves 41 are fixed by fastening bolts 412.

[0025] See also Figure 2-Figure 3 In the embodiment of the present invention, both sides of the opposite ends of the external steel pipe 3 and the joint pipe 1 are provided with a clamping hole 6 adapted to the clamping shaft 410, so that the clamping shaft 410 can be fully inserted into the clamping hole 6.

[0026] In this embodiment, when in use, the raised tube 2 at one end of the joint tube 1 is inserted into the external steel tube 3, and then the two half-ring sleeves 41 are put on the connection between the joint tube 1 and the external steel tube 3, and the turntable 45 is driven to rotate by turning the knob 44. Under the elasticity of the spring 49, when the turntable 45 rotates, one end of the eccentric rod 46 pushes the moving block 47 to move on the guide shaft 48, so that the two moving blocks 47 are separated from each other, and then the two clamping shafts 410 are separated from each other, so that one end of the two clamping shafts 410 corresponds to the clamping holes 6 on the joint tube 1 and the external steel tube 3 respectively, and one end of the clamping shaft 410 is respectively Insert it into the clamping hole 6 on the joint pipe 1 and the external steel pipe 3, and release the knob 44 after insertion. At this time, the moving block 47 is no longer pushed by the eccentric rod 46, and the spring 49 will reset the moving block 47. The clamping shaft 410 on the two moving blocks 47 will pull the joint pipe 1 and the external steel pipe 3 toward the middle direction, so that the joint pipe 1 and the external steel pipe 3 are tightly fitted and installed. Then, the raised blocks 411 on the two semi-annular sleeves 41 are fixed by tightening bolts 412, so that the two semi-annular sleeves 41 fix the connection between the joint pipe 1 and the external steel pipe 3, completing the connection operation of the joint pipe 1 and the external steel pipe 3.

[0027] For further information, see Figure 2-Figure 3 In the embodiment of the present invention, after the joint pipe 1 and the external steel pipe 3 are connected and the spring 49 is in the reset state, the distance between the joint pipe 1 and the clamping hole 6 on the external steel pipe 3 is greater than the distance between the two clamping shafts 410. When utilizing the elasticity of the spring 49, the distance between the two clamping shafts 410 is widened to make it equal to the distance between the joint pipe 1 and the clamping hole 6 on the external steel pipe 3, and then the clamping shafts 410 are inserted into the clamping hole 6. Thereafter, the spring 49 is utilized to reset the two clamping shafts 410, and the two clamping shafts 410 will pull the joint pipe 1 and the external steel pipe 3 to ensure the sealing and firmness of the connection between the joint pipe 1 and the external steel pipe 3.

[0028] For further information, see Figure 2 In the embodiment of the present invention, a layer of rubber sealing gasket is provided on the inner wall of the semi-annular sleeve 41, and the rubber sealing gasket plays a sealing role to prevent leakage.

[0029] The second embodiment differs from the first embodiment in that: See also Figure 1 and Figure 4-Figure 5 In the embodiment of the present invention, the sealing mechanism 5 includes an annular groove 51 provided on the end face of the joint pipe 1 at the periphery of the raised tube 2. A disc spring 52 is provided on the inner wall of the annular groove 51. The disc spring 52 adopts nitrogen spring technology and can maintain a constant elastic coefficient in the temperature range of -40°C to 150°C. A sealing gasket 53 is connected to one side of the disc spring 52. When the disc spring 52 is in the reset state, the sealing gasket 53 extends out of the annular groove 51 on the end face of the joint pipe 1 away from the side of the disc spring 52.

[0030] See also Figure 1 and Figure 4-Figure 5 In the embodiment of the present invention, a second annular groove 54 is provided on the end surface of the sealing gasket 1 53 away from the disc spring 52, and a water-expanding strip 55 is provided on the inner wall of the annular groove 2 54. The water-expanding strip 55 adopts a three-layer composite structure: the surface layer is a fast-seepage hydrophilic layer, the middle layer is an expansion rubber layer, and the bottom layer is a limiting support layer. A second sealing gasket 56 is provided on one side of the water-expanding strip 55. When the water-expanding strip 55 is not expanded, the side of the second sealing gasket 56 away from the water-expanding strip 55 is flush with the side of the sealing gasket 1 53 away from the disc spring 52. This flush design ensures that no initial stress concentration will be generated during installation.

[0031] See also Figure 1 and Figure 4-Figure 5 In the embodiment of the present invention, the inner ring of the sealing gasket 53 is densely covered with micropores 58 that communicate with the ring groove 2 54. The diameter of the micropores 58 is 50-100 μm and they are radially distributed, which can quickly guide the leaked medium to the expansion area. The micropores 58 correspond to the position of the water-expandable strips 55, forming a directional water guide channel to ensure that the medium preferentially contacts the active area of ​​the expansion strips. The expansion rate of the water-expandable strips 55 can reach 0.3 mm / s, and the initial expansion is completed within 5 seconds.

[0032] See also Figure 1 and Figure 4-Figure 5 In the embodiment of the present invention, a slope 57 is provided on the lower inner side of the annular groove 51. The slope 57 is trumpet-shaped, and its closing end corresponds to the connection between the joint pipe 1 and the external steel pipe 3. The slope 57 adopts a gradual slope design with an inlet angle of 15° and an outlet angle of 5°, forming a fluid dynamics diversion effect.

[0033] In this embodiment, when the joint pipe 1 and the external steel pipe 3 are installed, under the elasticity of the disc spring 52, the sealing gasket 1 53 will press against the end surface of the external steel pipe 3 after the joint pipe 1 and the external steel pipe 3 are installed, thereby playing a sealing role and preventing leakage. When leakage occurs, the water in the pipeline will flow out from the gap between the external steel pipe 3 and the raised pipe 2. When passing through the slope 57, it will flow along the slope 57 into the annular groove 1 51 on the end face of the joint pipe 1, and then moisten the water-expandable strip 55 in the annular groove 2 54 through the micropores 58. The water-expandable strip 55 will spontaneously expand when encountering moisture, and during the expansion, it will push the sealing gasket 2 56 to slide in the annular groove 2 54 on the end face of the sealing gasket 1 53, so that the end face of the sealing gasket 2 56 is tightly fitted to the end face of the external steel pipe 3, thereby further playing a sealing role and preventing moisture from flowing out.

[0034] For further information, see Figure 1 and Figure 4-Figure 5In the embodiment of the present invention, both the sealing gasket 1 53 and the sealing gasket 2 56 are made of stainless steel. Stainless steel has the function of preventing rust and is not prone to deformation and cracking, thereby ensuring the durability of the seal.

[0035] Working principle: insert the raised tube 2 at one end of the joint tube 1 into the external steel tube 3, then put the two half-rings 41 into the connection between the joint tube 1 and the external steel tube 3, and drive the turntable 45 to rotate by turning the knob 44. Under the elasticity of the spring 49, when the turntable 45 rotates, one end of the eccentric rod 46 will push the moving block 47 to move on the guide shaft 48, so that the two moving blocks 47 move away from each other, and then the two clamping shafts 410 move away from each other, so that one end of the two clamping shafts 410 corresponds to the clamping holes 6 on the joint tube 1 and the external steel tube 3 respectively, and one end of the clamping shaft 410 is inserted into After inserting the connector pipe 1 and the external steel pipe 3 into the clamping holes 6, the knob 44 is loosened. At this time, the moving block 47 is no longer pushed by the eccentric rod 46, and the spring 49 will reset the moving block 47. The clamping shafts 410 on the two moving blocks 47 will pull the connector pipe 1 and the external steel pipe 3 toward the middle direction, so that the connector pipe 1 and the external steel pipe 3 are tightly fitted together. Then, the raised blocks 411 on the two semi-annular sleeves 41 are fixed by tightening bolts 412, so that the two semi-annular sleeves 41 fix the connection between the connector pipe 1 and the external steel pipe 3, completing the connection operation between the connector pipe 1 and the external steel pipe 3; When installing the joint pipe 1 and the external steel pipe 3, under the elasticity of the disc spring 52, after the joint pipe 1 and the external steel pipe 3 are installed, the sealing gasket 1 53 will press against the end surface of the external steel pipe 3 to play a sealing role and prevent leakage; When leakage occurs, the water in the pipeline will flow out from the gap between the external steel pipe 3 and the raised pipe 2. When passing through the slope 57, it will flow along the slope 57 into the annular groove 1 51 on the end face of the joint pipe 1, and then moisten the water-expandable strip 55 in the annular groove 2 54 through the micropores 58. The water-expandable strip 55 will spontaneously expand when encountering moisture, and during the expansion, it will push the sealing gasket 2 56 to slide in the annular groove 2 54 on the end face of the sealing gasket 1 53, so that the end face of the sealing gasket 2 56 is tightly fitted to the end face of the external steel pipe 3, thereby further playing a sealing role and preventing moisture from flowing out.

[0036] At the same time, the contents not described in detail in this specification belong to the existing technology well known to those skilled in the art.

[0037] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A convenient steel pipe joint structure with no welding connection, comprising a joint pipe (1) and an external steel pipe (3) to be connected, characterized in that: Both ends of the joint pipe (1) are integrally formed with raised pipes (2) that match the inner diameter of the external steel pipe (3); the raised pipes (2) are inserted into the external steel pipe (3), and the joint pipe (1) and the external steel pipe (3) are fixed by a fastening sleeve (4); The fastening sleeve (4) comprises two semi-annular sleeves (41), the two semi-annular sleeves (41) are sleeved at the connection between the joint pipe (1) and the external steel pipe (3), and a shell seat (42) is provided in the middle of the outer arc surface of the semi-annular sleeve (41), and a limiting groove (43) communicating with the inside of the shell seat (42) is provided on the inner arc surface of the semi-annular sleeve (41), and a knob (44) is provided on the side of the shell seat (42) away from the semi-annular sleeve (41) for rotation. One end of the knob (44) is located in the shell seat (42) and is connected to a turntable (45). The turntable (45) is symmetrical with its center point on the side away from the knob (44). Two eccentric rods (46) are connected, and the other end of the eccentric rod (46) is hinged with a moving block (47). One side of both ends of the moving block (47) is laterally slidably inserted with a guide shaft (48). The other end of the guide shaft (48) is connected to the inner side of the shell seat (42), and the outer sleeve of the guide shaft (48) is provided with a spring (49). The two ends of the spring (49) are respectively connected to one side of the moving block (47) and the inner side of the shell seat (42). One side of the moving block (47) is connected to a clamping shaft (410) corresponding to the limiting groove (43), and the other end of the clamping shaft (410) slides laterally and extends out of the limiting groove (43).

2. The convenient steel pipe joint structure with no welding connection according to claim 1, characterized in that: Both ends of the semi-annular sleeve (41) are provided with raised blocks (411). After the two semi-annular sleeves (41) are combined, the raised blocks (411) on the two semi-annular sleeves (41) are fixed by fastening bolts (412).

3. The convenient steel pipe joint structure with no welding connection according to claim 1, characterized in that: Clamping holes (6) adapted to the clamping shaft (410) are provided on both sides of the opposite ends of the external steel pipe (3) and the joint pipe (1), so that the clamping shaft (410) can be completely inserted into the clamping hole (6).

4. The convenient steel pipe joint structure with no welding connection according to claim 1, characterized in that: After the joint pipe (1) and the external steel pipe (3) are connected, and the spring (49) is in a reset state, the distance between the clamping holes (6) on the joint pipe (1) and the external steel pipe (3) is greater than the distance between the two clamping shafts (410).

5. The convenient steel pipe joint structure with no welding connection according to claim 1, characterized in that: The inner wall of the semi-annular sleeve (41) is provided with a layer of rubber sealing gasket.

6. The convenient steel pipe joint structure with no welding connection according to claim 1, characterized in that: The sealing mechanism (5) comprises an annular groove (51) provided on the end face of the joint tube (1) and located at the periphery of the raised tube (2); a disc spring (52) is provided on the inner wall of the annular groove (51); a sealing gasket (53) is connected to one side of the disc spring (52); and when the disc spring (52) is in a reset state, the sealing gasket (53) extends out of the annular groove (51) on the end face of the joint tube (1) on the side away from the disc spring (52).

7. The convenient steel pipe joint structure with no welding connection according to claim 6, characterized in that: The end surface of the sealing gasket 1 (53) away from the disc spring (52) is provided with an annular groove 2 (54), the inner wall of the annular groove 2 (54) is provided with a water-expanding strip (55), and a sealing gasket 2 (56) is provided on one side of the water-expanding strip (55). When the water-expanding strip (55) is not expanded, the side of the sealing gasket 2 (56) away from the water-expanding strip (55) is flush with the side of the sealing gasket 1 (53) away from the disc spring (52).

8. The convenient steel pipe joint structure with no welding connection according to claim 7, characterized in that: The inner ring of the sealing gasket 1 (53) is densely covered with micropores (58) communicating with the annular groove 2 (54), and the micropores (58) correspond to the positions of the water-expanding strips (55).

9. The convenient steel pipe joint structure with no welding connection according to claim 6, characterized in that: A slope (57) is provided on the inner lower side of the annular groove (51). The slope (57) is trumpet-shaped, and its closing end corresponds to the connection between the joint pipe (1) and the external steel pipe (3).

10. The convenient steel pipe joint structure with no welding connection according to claim 7, characterized in that: The sealing gasket 1 (53) and the sealing gasket 2 (56) are both made of stainless steel.

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