Steel structure connecting device and method based on three-stage fixing

Abstract

The invention discloses a steel structure connecting device and method based on three-stage fixing. The device comprises a steel pipe, a connector, a connecting assembly and a sliding sleeve. The connecting assembly comprises a connecting shaft and a conical head; a limiting groove is formed among the steel pipe, the connecting shaft and the conical head; a circular groove is formed in the steel pipe; a connecting groove and a blocking piece are arranged in the connector; a plurality of first wedge-shaped blocks are arranged outside the steel pipe; a second wedge-shaped block matched with the first wedge-shaped block is arranged on the inner cavity wall of the connector; a stop block and an arc-shaped groove are arranged on the outer surface of the connector; clamping balls are arranged in the arc-shaped grooves; the sliding sleeve comprises a protruding block and a sliding ring. A steel pipe is inserted into the connector, a first wedge-shaped block and a second wedge-shaped block are clamped, a sliding sleeve moves to enable a protruding block to press a clamping ball into a circular groove, a blocking piece abuts against the interior of a limiting groove, and third-time fixing of the steel pipe is achieved; the problems that in steel structure connection, the welding process is complex, efficiency is low, deformation is prone to occurring, bolt connection centering difficulty is large, and the fatigue life is short can be effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel structure connection, and more specifically, relates to a steel structure connection device and method based on three-level fixation. Background Art

[0002] With the continuous development of water conservancy projects, steel structures are increasingly being used in permanent and temporary hydraulic structures due to their advantages, including high strength, light weight, high degree of industrialization, and aesthetic appearance. However, currently, steel structures are primarily connected using welding and bolting, which presents challenges such as difficulty in construction, low efficiency, and easy deformation.

[0003] Welding requires high worker skill and is complex. The weld quality is difficult to guarantee and can easily lead to stress concentration and residual stress, which can cause deformation. For example, high temperatures during welding can cause the material to become brittle, compromising the safety of the structure. Welded joints are also sensitive to cracks, and once they appear, they can rapidly expand and cause structural failure. Furthermore, welding is time-consuming and costly, and can create residual stresses that can compromise the long-term performance of the structure.

[0004] Bolted connections, on the other hand, present challenges such as excessive bolt usage, difficulty aligning bolt holes, and low connection efficiency. Traditional bolted connections also present certain safety risks, with numerous hazardous factors present during construction. For example, high-strength bolts are easy to install and quick to use, accelerating construction progress while ensuring quality. However, they have limited load-bearing capacity and require regular maintenance. Furthermore, for extending closed-section steel members, traditional flange bolt connections employ a torque-based construction method, which can lead to bolt loosening under fatigue loads and results in a low fatigue life.

[0005] To sum up, the existing steel structure connection technology has many shortcomings, and there is an urgent need for a new steel structure connector and its use method to solve the problems existing in the existing technology, such as unstable steel structure connection, complex welding process, and low bolt connection efficiency, thereby improving the connection efficiency and stability of steel columns and reducing construction risks. Summary of the Invention

[0006] To address the above-mentioned deficiencies or improvements in the prior art, the present invention provides a three-stage steel structure connection device. The device achieves axial fixation of the steel pipe by engaging a first wedge-shaped block on the outside of the steel pipe with a second wedge-shaped block inside the connector. After the sleeve slides, a locking ball, under the action of a second spring, presses into the circular groove of the steel pipe, achieving radial fixation. Furthermore, the blocking member's locking head presses against the retaining groove, achieving three-stage fixation of the steel pipe, completing a stable connection between the two steel pipes. This three-stage fixation mechanism (axial fixation, radial fixation, and positional fixation) ensures the stability of the steel pipe connection, effectively solving the problems of complex welding processes, low efficiency, and easy deformation, as well as the difficulty of centering bolt connections and low fatigue life in existing steel structure connection technologies. The present invention completely eliminates traditional welding processes through mechanical connection, reducing construction difficulty and risks, simplifying the operation process, and improving connection efficiency and reliability. The sliding and reset design of the sleeve allows the device to be disassembled and reused multiple times, further reducing construction costs. Furthermore, the coordination between the blocking member and the locking ball ensures the connection's robustness and fatigue resistance, providing an efficient, safe, and reliable connection solution for steel structure projects.

[0007] In order to achieve the above-mentioned object, one aspect of the present invention provides a steel structure connection device based on three-level fixation, comprising two steel pipes, a connector provided between the ends of the two steel pipes, a connection assembly provided on the steel pipes near one end where the connector is located, and two sliding sleeves provided on the connector in parallel and spaced sliding manner; wherein,

[0008] The connecting assembly includes a connecting shaft with a diameter smaller than that of the steel pipe and a conical head provided on the connecting shaft; a limiting groove is formed between the steel pipe, the connecting shaft and the conical head; and a circular groove is provided on the outer surface of the steel pipe along the circumferential direction;

[0009] The two ends of the connector are respectively provided with a connecting groove and a blocking member that match the connecting assembly; the blocking member will deform under the pressure of a strong external force and return to its original shape when the external force disappears; the outer surface of the steel pipe is provided with a plurality of first wedge blocks evenly spaced along the circumference; the inner cavity wall of the connector is provided with a second wedge block that can be compressed into the wall and matches the first wedge block; the outer surface of the connector is provided with a protruding blocking block and a plurality of arc grooves along the circumference; the arc grooves are provided with a blocking ball inside;

[0010] The sliding sleeve includes a protruding block arranged along the circumference of the connector and a slip ring provided on the protruding block; the sliding sleeve can slide under the blocking action of the block and press the ball into the interior of the circular groove through the protruding block;

[0011] When the steel pipe is inserted into the connector, the first wedge block outside the steel pipe engages with the second wedge block, the locking ball is pressed into the inside of the circular groove, and the blocking member presses against the inside of the limiting groove, thereby achieving three-time fixation of the steel pipe.

[0012] Furthermore, the circular groove is located between the circumference where the plurality of first wedge-shaped blocks are located and the connecting assembly.

[0013] Furthermore, the arc-shaped groove and the stopper are located in different planes;

[0014] The thickness of the stopper is adapted to the distance between the slip ring and the outer surface of the connector.

[0015] Furthermore, the arc-shaped groove is narrower on a side close to the inner cavity of the connector and wider on a side away from the inner cavity of the connector; and the narrowest part of the arc-shaped groove is smaller than the widest part of the clamping ball.

[0016] Furthermore, the protruding block forms a first hollow groove and a second hollow groove between the slip ring and the outer surface of the connector.

[0017] Further, the depth of the first hollow groove is less than the depth of the second hollow groove;

[0018] The first hollow groove is located on a side of the second hollow groove away from the center of the connector.

[0019] Furthermore, when the stopper is connected to the bottom of the slip ring, the second hollow groove forms a closed space, and a second spring is provided in the closed space.

[0020] Furthermore, a vertical groove is provided on the inner cavity wall of the connector; a first spring is fixed inside the vertical groove; and the second wedge-shaped block is fixed to the first spring.

[0021] Furthermore, the blocking member includes a clamping ring and a plurality of clamping heads evenly spaced apart on the clamping ring;

[0022] The clamping head will deform when subjected to a strong external force and return to its original shape when the external force disappears.

[0023] A second aspect of the present invention provides a steel structure connection method based on three-level fixation, which is implemented using the steel structure connection device based on three-level fixation and includes the following steps:

[0024] S1: In the preparation stage, two steel pipes are prepared and a connection assembly is installed at one end of each steel pipe near the connector; a circular groove and a plurality of first wedge blocks are circumferentially arranged on the outer surface of the steel pipe;

[0025] S2: Sliding sleeve stage: two sliding sleeves are provided on the connector in parallel and spaced apart. The sliding sleeves compress the second spring under the blocking action of the stopper. After the sliding sleeves slide, the protruding block leaves the position of the arc groove, and the first hollow groove moves to the position of the arc groove. The pressure of the protruding block on the card ball disappears, and the card ball can move between the arc groove and the hollow groove.

[0026] S3: Insertion stage: Insert one end of the steel pipe into the connector. During the insertion process, the first wedge block on the outside of the steel pipe moves along the surface of the second wedge block, pressing the second wedge block back into the vertical groove; when the first wedge block completely passes through the second wedge block, the two are engaged;

[0027] S4: In the locking stage, when the steel pipe is inserted to the limit position, the circular groove on the outside of the steel pipe is aligned with the arc groove on the connector; the sliding sleeve is loosened, and under the reset action of the second spring, the sliding sleeve moves in the opposite direction and resets, and the protruding block presses the clamping ball again, pressing it into the circular groove; at the same time, the conical head moves through the blocking piece, pressing the clamping head to open, and when the conical head passes completely, the clamping head resets and presses into the limiting groove; through the engagement of the first wedge block and the second wedge block, the clamping ball is pressed into the circular groove, and the clamping head is pressed into the limiting groove, the steel pipe is fixed three times, completing a stable connection between the two steel pipes.

[0028] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0029] (1) The steel structure connection device based on three-stage fixation of the present invention realizes axial fixation of the steel pipe by engaging the first wedge block outside the steel pipe with the second wedge block inside the connector; after the sliding sleeve slides, the clamping ball is pressed into the circular groove of the steel pipe under the action of the second spring to realize radial fixation; and by making the clamping head of the blocking member press against the inside of the limiting groove, the steel pipe is fixed three times to complete the stable connection between the two steel pipes; through the three-stage fixing mechanism (axial fixing, radial fixing and limiting fixing), the problems of complex welding process, easy deformation, difficult centering of bolt connection, and low fatigue life in the existing steel structure connection technology are effectively solved. The present invention completely abandons the traditional welding process through mechanical connection, reduces the construction difficulty and risk, simplifies the operation process, and improves the connection efficiency and reliability.

[0030] (2) The steel structure connection device based on three-level fixation of the present invention allows the device to be disassembled and reused multiple times through the sliding and resetting design of the sleeve, further reducing the construction cost. In addition, the firmness and fatigue resistance of the connection are ensured by the cooperation of the blocking member and the card ball, providing an efficient, safe and reliable connection solution for steel structure projects. The design of the steel structure connection device based on three-level fixation of the present invention takes into account disassembly and reusability, which are relatively lacking in the prior art. The disassembly and reinstallation of the connection device can be achieved through simple operations, which greatly improves the flexibility and practicality of the device and reduces resource waste and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall structure of a steel structure connection device based on three-level fixation according to Example 1 of the present invention;

[0032] Figure 2 This is a structural schematic diagram of a connection assembly of a steel structure connection device based on three-level fixation according to Example 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the internal cross-sectional structure of a connector of a steel structure connection device based on three-level fixation according to Example 1 of the present invention;

[0034] Figure 4 This is a schematic diagram of the arrangement positions of the first spring and the second wedge-shaped block of the connecting head of a steel structure connecting device based on three-level fixation in Example 1 of the present invention;

[0035] Figure 5 This is a flow chart of a connection method for a steel structure connection device based on three-level fixation according to Example 2 of the present invention.

[0036] In all the drawings, the same figure marks represent the same technical features, specifically: 1-steel pipe, 11-circular groove, 12-first wedge block, 2-connector, 21-connecting groove, 22-blocking member, 221-clamping ring, 222-clamping head, 23-stopper, 24-arc groove, 25-clamping ball, 26-vertical groove, 27-first spring, 28-second wedge block, 3-connecting assembly, 31-connecting shaft, 32-conical head, 33-limiting groove, 4-sleeve, 41-protruding block, 42-slip ring, 43-first hollow groove, 44-second hollow groove, 45-second spring. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0038] like Figures 1-4As shown, one aspect of the present invention provides a steel structure connection device based on three-level fixation, comprising two steel pipes 1, a connector 2 provided between the ends of the two steel pipes 1, a connection assembly 3 provided on the steel pipe 1 near the end where the connector 2 is located, and two sliding sleeves 4 provided on the connector 2 in parallel and spaced sliding manner; the connection assembly 3 includes a connection shaft 31 with a diameter smaller than that of the steel pipe 1, and a conical head 32 provided on the connection shaft 31; a limiting groove 33 is formed between the steel pipe 1, the connection shaft 31 and the conical head 32, and the outer surface of the steel pipe 1 is provided with a circular groove along the circumference. Groove 11; The two ends of the connector 2 are respectively provided with a connecting groove 21 and a blocking member 22 that match the conical head 32 of the connecting assembly 3; the blocking member 22 will deform under the pressure of a strong external force and return to its original shape when the external force disappears; The outer surface of the steel pipe 1 is provided with a plurality of first wedge blocks 12 evenly spaced along the circumference; The inner cavity wall of the connector 2 is provided with a second wedge block 28 that can be compressed into the wall and matches the first wedge block 12; The sliding sleeve 4 includes a protruding block 41 arranged along the circumference of the connector 2 and a protruding block 41 provided on the protruding block The sliding ring 42; the sliding sleeve 4 can slide under the blocking action of the stopper 23 and press the card ball 25 into the inside of the circular groove 11 through the protruding block 41; when the steel pipe 1 is inserted into the interior of the connector 2, the first wedge block 12 outside the steel pipe 1 is engaged with the second wedge block 28 to achieve axial fixation, and the card ball 25 is pressed into the inside of the circular groove 11 to achieve radial fixation, and the card head 222 of the blocking member 22 is pressed against the inside of the limiting groove 33 to achieve limited fixation, thereby achieving three-time fixation of the steel pipe 1; the present invention ensures the stability of the steel pipe connection through the three-time fixing mechanism and effectively prevents loosening and deformation; the sliding and resetting design of the sliding sleeve 4 simplifies the operation process and improves the connection efficiency; the cooperation of the blocking member 22 and the blocking ball 25 ensures the reliability of the connection and reduces the construction risk; the design of the sliding sleeve 4 and the first spring 41 allows the device to be disassembled and reused many times; the steel structure connection device based on three-level fixation of the present invention completely abandons the traditional welding process through mechanical connection, which not only reduces the construction difficulty, but also significantly improves the efficiency and stability of the connection, providing a high-efficiency, safe and reliable connection solution for steel structure projects.

[0039] Furthermore, if Figures 1-4As shown, the connecting head 2 is arranged between the ends of the two steel pipes 1 to achieve docking and fixation of the steel pipes; the sliding sleeve 4 is arranged on the connecting head 2 in parallel and at intervals for auxiliary fixation and adjustment of the connection state; the limiting groove 33 is formed between the steel pipe 1, the connecting shaft 31 and the conical head 32, and is used to cooperate with the clamping head 222 of the blocking member 22 to achieve limited fixation of the steel pipe; the first wedge blocks 12 are evenly spaced along the circumference of the outer surface of the steel pipe 1, and are used to cooperate with the second wedge blocks 28 in the connecting head 2 to achieve axial fixation of the steel pipe; the second wedge blocks 28 are arranged on the inner cavity wall of the connecting head 2, which can be compressed into the wall and cooperate with the first wedge blocks 12 on the steel pipe 1 to achieve axial fixation of the steel pipe; the connecting grooves 21 are arranged inside the two ends of the connecting head 2 to accommodate the connecting shaft 31 of the connecting assembly 3; the clamping ball 25 is arranged in the arc groove 24 of the connecting head 2, and cooperates with the circular groove 11 on the outside of the steel pipe to achieve radial fixation.

[0040] Furthermore, if Figures 1-4 As shown, the outer surface of the connector 2 is arranged along the circumference with a protruding stopper 23 and a plurality of arc-shaped grooves 24 communicating with the interior; the arc-shaped grooves 24 and the stopper 23 are located in different planes; a locking ball 25 is provided inside the arc-shaped groove 24; in the initial state, the locking ball 25 is pressed by the protruding block 41 so that one side of the locking ball 25 is located inside the connector 2; the arc-shaped groove 24 is narrow on the side close to the inner cavity of the connector 2 and wide on the side away from the inner cavity of the connector 2; the narrowest part of the arc-shaped groove 24 is smaller than the widest part of the locking ball 25, which can prevent the locking ball 25 from falling off from the inside of the arc-shaped groove 24.

[0041] Furthermore, if Figures 1-4 As shown, the circular groove 11 is located between the circumference of the multiple first wedge blocks 12 and the connecting component 3; the circular groove 11 is arranged along the circumference of the outer surface of the steel pipe 1, and is used to cooperate with the blocking ball 25 to achieve radial fixation of the steel pipe; the conical head 32 is provided on the connecting shaft 31, and the conical head 32 is wide on the side close to the connecting shaft 31 and narrow on the side away from the connecting shaft 31, and is used to compress the blocking member 22 in the connecting head 2 and achieve limiting.

[0042] Furthermore, if Figures 1-4 As shown, the blocking member 22 includes a clamping ring 221 and a plurality of clamping heads 222 evenly spaced on the clamping ring 221. The clamping heads 222 will deform under the pressure of a strong external force and return to their original shape when the external force disappears. They are used to cooperate with the limiting groove 33 to achieve limiting fixation of the steel pipe.

[0043] Furthermore, if Figures 1-4 As shown, the inner wall of the connector 2 is provided with a vertical groove 26, and a first spring 27 is fixed inside the vertical groove 26; the second wedge block 28 is fixed to the first spring 27; the first wedge block 12 and the second wedge block 28 cooperate with each other to achieve axial fixation.

[0044] Furthermore, if Figures 1-4 As shown, the thickness of the stopper 23 is adapted to the distance between the slip ring 42 and the outer surface of the connector 2; the depth of the first hollow groove 43 is less than the depth of the second hollow groove 44; the first hollow groove 43 is located on the side of the second hollow groove 44 away from the center of the connector 2;

[0045] Furthermore, if Figures 1-4 As shown, the protruding block 41 forms a first hollow groove 43 and a second hollow groove 44 between the slip ring 42 and the outer surface of the connector 2; when the stop block 23 is connected to the bottom of the slip ring 42, the second hollow groove 44 forms a closed space, and a second spring 41 is provided in the closed space; the second spring 41 can be used to reset the sleeve 4; specifically, the sleeve 4 can slide and compress the second spring 41 under the blocking action of the stop block 23. After the sleeve 4 is released, the second spring 41 is reset, and the protruding block 41 presses the card ball 25, pressing the card ball 25 into the interior of the circular groove 11.

[0046] The working principle of this embodiment is as follows: a worker slides the sleeve 4 on the outside of the connector 2. When the sleeve 4 moves and is blocked by the stop block 23, the second spring 41 is compressed. After the sleeve 4 slides, the protruding block 41 will leave the position of the arc groove 24, and the first hollow groove 43 will move to the position of the arc groove 24. Then, after the protruding block 41 leaves, the pressure on the card ball 25 disappears, so the card ball 25 can move between the arc groove 24 and the first hollow groove 43 at this time. The sleeve 4 needs to be pressed still, and then another worker inserts one end of the steel pipe 1 into the interior of the connector 2. When the steel pipe 1 enters the interior of the connector 2, the first wedge block 12 on the outside of the steel pipe 1 will contact the second wedge block 28, and then the first wedge block 12 moves along the surface of the second wedge block 28. During the movement, the first wedge block 12 will press the second wedge block 28. At this time, the first spring 27 is compressed and then the second wedge block 28 returns to the inside of the vertical groove 26. When the first wedge block 12 passes through the second wedge block 28, the two will be engaged.

[0047] When the steel pipe 1 can no longer be inserted into the connector 2, the circular groove 11 on the outside of the steel pipe 1 is exactly at the position of the arc groove 24. At this time, the sliding sleeve 4 needs to be loosened, and then the sliding sleeve 4 moves in the opposite direction and resets under the restoring action of the second spring 41. Then the protruding block 41 presses the card ball 25 again, pressing the card ball 25 into the inside of the circular groove 11.

[0048] When the steel pipe 1 is inserted, the conical head 32 will drive the conical head 32 to move. When the conical head 32 moves, it will pass the blocking member 22. The conical head 32 is wider on one side and narrower on the other side. When the conical head 32 moves, it will press each clamping head 222 and open each clamping head 222. As the conical head 32 moves, the limiting groove 33 will move to the inner side of each clamping head 222. At this time, the conical head 32 leaves the position of the clamping head 222 and enters the interior of the connecting groove 21. Since the pressure of the conical head 32 on each clamping head 222 disappears at this time, each clamping head 222 returns to its original state and presses against the interior of the limiting groove 33; by making the first wedge block 12 engage with the second wedge block 28, the card ball 25 is pressed into the interior of the circular groove 11, and each clamping head 222 presses against the interior of the limiting groove 33, the steel pipe 1 can be fixed three times to make it firmly fixed inside the connecting head 2, thereby completing the connection between the two steel pipes 1.

[0049] like Figure 5 As shown, the second aspect of the present invention provides a steel structure connection method, comprising the following steps:

[0050] S1: Preparation stage: prepare two steel pipes 1 and install a connection assembly 3 at one end of each steel pipe near the connector 2; set a circular groove 11 and a plurality of first wedge blocks 12 along the circumferential direction on the outer surface of the steel pipe 1;

[0051] S2: Sliding sleeve stage: Two sliding sleeves 4 are slidably arranged in parallel on the connector 2. The sliding sleeves 4 compress the second spring 41 under the blocking action of the stopper 23. After the sliding sleeves 4 are slid, the protruding block 41 leaves the position of the arc groove 24, and the first hollow groove 44 moves to the position of the arc groove 24. The pressure of the protruding block 41 on the locking ball 25 disappears, and the locking ball 25 can move between the arc groove 24 and the hollow groove 44.

[0052] S3: During the insertion phase, one end of the steel pipe 1 is inserted into the connector 2. During the insertion process, the first wedge block 12 on the outside of the steel pipe 1 comes into contact with the second wedge block 28 inside the connector 2. The first wedge block 12 moves along the surface of the second wedge block 28, pressing the second wedge block 28, causing the first spring 27 to be compressed, and the second wedge block 28 to return to the inside of the vertical groove 26. When the first wedge block 12 completely passes through the second wedge block 28, the two are engaged.

[0053] S4: In the locking stage, when the steel pipe 1 is inserted to the limit position, the circular groove 11 on the outside of the steel pipe 1 is aligned with the arc groove 24 on the connector 2; the sliding sleeve 4 is released, and under the reset action of the second spring 41, the sliding sleeve 4 moves back to reset, and the protruding block 41 re-presses the clamping ball 25, pressing it into the inside of the circular groove 11; at the same time, the conical head 32 moves past the blocking member 22, pressing the clamping head 222 to open, and when the conical head 32 has completely passed, the clamping head 222 is reset and pressed into the inside of the limit groove 33;

[0054] The axial fixation of the steel pipe is achieved by the engagement of the first wedge block 12 on the outside of the steel pipe and the second wedge block 28 inside the connector 2; after the sleeve 4 slides, the locking ball 25 is pressed into the circular groove 11 of the steel pipe under the action of the second spring 41 to achieve radial fixation; and the clamping head 222 of the blocking member 22 is pressed against the inside of the limiting groove 33 to achieve three-way fixation of the steel pipe 1, completing a stable connection between the two steel pipes 1.

[0055] This invention effectively addresses existing steel structure connection technologies, including complex welding processes, easy deformation, difficulty aligning bolted connections, and low fatigue life, through a three-step fixing mechanism (axial, radial, and position-limiting). The sliding and resetting design of the sleeve simplifies the operation process and improves connection efficiency. The coordination of the blocking member and the locking ball ensures connection reliability and reduces construction risks. The design of the sleeve and spring allows for multiple disassembly and reuse. This invention completely eliminates traditional welding processes through mechanical connection, reducing construction difficulty and risks while simplifying the operation process and improving connection efficiency and reliability.

[0056] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A steel structure connection device based on three-level fixation, characterized in that: It comprises two steel pipes (1), a connector (2) provided between the ends of the two steel pipes (1), a connecting assembly (3) provided on one end of the steel pipe (1) close to the connector (2), and two sliding sleeves (4) provided on the connector (2) in parallel and spaced sliding relation; wherein, The connecting assembly (3) comprises a connecting shaft (31) having a diameter smaller than that of the steel pipe (1), and a conical head (32) provided on the connecting shaft (31); a limiting groove (33) is formed between the steel pipe (1), the connecting shaft (31) and the conical head (32); and a circular groove (11) is provided on the outer surface of the steel pipe (1) along the circumferential direction; The two ends of the connector (2) are respectively provided with a connecting groove (21) and a blocking member (22) that match the connecting assembly (3); the blocking member (22) will be deformed when subjected to a strong external force and will return to its original shape when the external force disappears; the outer surface of the steel pipe (1) is provided with a plurality of first wedge blocks (12) uniformly spaced along the circumference; the inner cavity wall of the connector (2) is provided with a second wedge block (28) that can be compressed into the wall and matches the first wedge block (12); the outer surface of the connector (2) is provided with a protruding blocking block (23) and a plurality of arc grooves (24) along the circumference; the inner surface of the arc groove (24) is provided with a blocking ball (25); The sliding sleeve (4) comprises a protruding block (41) arranged along the circumference of the connector (2) and a slip ring (42) provided on the protruding block (41); the sliding sleeve (4) can slide under the blocking action of the stop block (23) and press the blocking ball (25) into the interior of the circular groove (11) through the protruding block (41); When the steel pipe (1) is inserted into the connector (2), the first wedge block (12) outside the steel pipe (1) engages with the second wedge block (28), the locking ball (25) is pressed into the inside of the circular groove (11), and the blocking member (22) presses against the inside of the limiting groove (33), thereby achieving three-fold fixation of the steel pipe (1).

2. The steel structure connection device based on three-level fixation according to claim 1 is characterized in that: The circular groove (11) is located between the circumference where the plurality of first wedge-shaped blocks (12) are located and the connecting component (3).

3. The steel structure connection device based on three-level fixation according to claim 1 is characterized in that: The arc-shaped groove (24) and the stopper (23) are located in different planes; The thickness of the stopper (23) is adapted to the distance between the slip ring (42) and the outer surface of the connector (2).

4. The steel structure connection device based on three-level fixation according to claim 3 is characterized in that: The arc-shaped groove (24) is narrow on the side close to the inner cavity of the connector (2) and wide on the side away from the inner cavity of the connector (2); the narrowest part of the arc-shaped groove (24) is smaller than the widest part of the clamping ball (25).

5. The steel structure connection device based on three-level fixation according to any one of claims 1 to 4, characterized in that: The protruding block (41) forms a first hollow groove (43) and a second hollow groove (44) between the slip ring (42) and the outer surface of the connector (2).

6. The steel structure connection device based on three-level fixation according to claim 5, characterized in that: The depth of the first hollow groove (43) is smaller than the depth of the second hollow groove (44); The first hollow groove (43) is located on a side of the second hollow groove (44) away from the center of the connector (2).

7. The steel structure connection device based on three-level fixation according to claim 6, characterized in that: When the stopper (23) is connected to the bottom of the slip ring (42), the second hollow groove (44) forms a closed space, and a second spring (41) is arranged in the closed space.

8. The steel structure connection device based on three-level fixation according to any one of claims 1-4, 6, and 7, characterized in that: The inner cavity wall of the connector (2) is provided with a vertical groove (26); a first spring (27) is fixed inside the vertical groove (26); and the second wedge block (28) is fixed to the first spring (27).

9. The steel structure connection device based on three-level fixation according to any one of claims 1-4, 6, and 7, characterized in that: The blocking member (22) comprises a snap ring (221) and a plurality of snap heads (222) evenly spaced apart on the snap ring (221); The clamping head (222) will deform when subjected to a strong external force and return to its original shape when the external force disappears.

10. A steel structure connection method based on three-level fixing, characterized in that: The method is implemented by applying the three-stage fixed steel structure connection device according to any one of claims 1 to 9, comprising the following steps: S1: Preparation stage, preparing two steel pipes (1), and installing a connection assembly (3) at one end of each steel pipe close to the connector (2); arranging a circular groove (11) and a plurality of first wedge blocks (12) along the circumferential direction on the outer surface of the steel pipe (1); S2: Sliding sleeve stage, two sliding sleeves (4) are arranged on the connector (2) in parallel and at intervals, and the sliding sleeves (4) are slid and compressed under the blocking action of the stopper (23); after the sliding sleeves (4) are slid, the protruding block (41) leaves the position of the arc groove (24), and the first hollow groove (44) moves to the position of the arc groove (24), and the pressure of the protruding block (41) on the card ball (25) disappears, and the card ball (25) can move between the arc groove (24) and the hollow groove (44); S3: Insertion stage, one end of the steel pipe (1) is inserted into the interior of the connector (2). During the insertion process, the first wedge block (12) outside the steel pipe (1) moves along the surface of the second wedge block (28), pressing the second wedge block (28) back into the vertical groove (26); when the first wedge block (12) completely passes through the second wedge block (28), the two are engaged; S4: In the locking stage, when the steel pipe (1) is inserted into the limit position, the circular groove (11) outside the steel pipe (1) is aligned with the arc groove (24) on the connector (2); the sliding sleeve (4) is loosened, and under the reset action of the second spring (41), the sliding sleeve (4) moves in the opposite direction and resets, and the protruding block (41) re-presses the clamping ball (25) and presses it into the inside of the circular groove (11); at the same time, the conical head (32) moves through the blocking member (22) and presses the clamping head (222) to open. When the conical head (32) completely passes, the clamping head (222) resets and presses against the inside of the limiting groove (33); through the engagement of the first wedge block (12) and the second wedge block (28), the clamping ball (25) is pressed into the circular groove (11), and the clamping head (222) is pressed against the inside of the limiting groove (33), the steel pipe (1) is fixed three times, and a stable connection between the two steel pipes (1) is completed.

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