Rebar self-locking joint

Abstract

The utility model relates to reinforcing bar connecting technical field, more particularly to a reinforcing bar self-locking joint. The reinforcing bar self-locking joint includes a taper sleeve and a lock piece group; the taper sleeve has a coaxial taper hole; the lock piece group includes a plurality of lock pieces and forms a ring shape; the outer periphery of the lock piece group is a tapered surface matching the taper hole; the inner periphery of the lock piece is provided with teeth capable of connecting with the reinforcing bar; the lock piece group and the taper sleeve are capable of achieving a tight connection between the joint and the reinforcing bar through friction self-locking. The utility model achieves friction self-locking through the cooperation of the taper hole and the tapered surface of the outer periphery of the lock piece group, which can flexibly adapt to the dense reinforcement and limited operation space in modular construction, and does not need to rely on a heavy extrusion mold. A tight connection can be achieved through the teeth and friction self-locking through simple assembly, which greatly reduces the dependence on construction equipment, improves the operation convenience and construction efficiency, does not need to rotate the reinforcing bar, is more suitable for modular construction, is more convenient to install, requires less operation space, and has high connection efficiency.

Description

Technical Field

[0001] This utility model relates to the field of rebar connection technology, and more specifically, to a rebar self-locking joint. Background Technology

[0002] After decades of rapid development and large-scale infrastructure construction, my country's construction technology has made significant progress. Currently, with the slowdown in domestic construction progress, new demands are being placed on construction technology. In the field of rebar connections, many new connection technologies have emerged, including not only conventional threaded joints but also cold-extruded joints and chemically anchored joints. However, with the development and application of modular construction technology, traditional rebar connection joints can no longer meet the current technical requirements for many projects.

[0003] Traditional rebar connection methods mainly include welding, threaded sleeve connection, and cold extrusion connection. Welding requires on-site hot work, is greatly affected by the environment and weather, and has significant quality fluctuations; threaded sleeves require pre-threading of the rebar ends and rotation of the rebar during installation, which has high requirements for space and rebar alignment, making it difficult to adapt to modular and dense reinforcement scenarios; cold extrusion requires heavy-duty hydraulic clamps, requires a large operating space, and the extrusion mold is bulky, limiting construction efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a self-locking rebar connector that enables rebar self-locking.

[0005] This utility model provides a self-locking joint for reinforcing bars, including a tapered sleeve and a locking plate assembly; The tapered sleeve has a coaxially arranged tapered hole; The locking plate group comprises a ring composed of multiple locking plates. The outer periphery of the locking plate group has a tapered surface that matches the tapered hole, and the inner periphery of the locking plate is provided with teeth that can be connected to the reinforcing bar. The locking plate assembly and the tapered sleeve achieve a tight connection between the joint and the reinforcing bar through friction self-locking.

[0006] In an optional embodiment, the inner conical surface of the cone sleeve is provided with at least one inner step, and the conical surface of the locking plate assembly is provided with an outer step that matches the inner step of the cone sleeve; The inner step and the outer step abut against each other, which can reduce the springback after the joint is installed.

[0007] In optional implementations, a backstop structure is also included; The anti-reverse structure includes an annular protrusion on the outer step of the locking plate assembly and an annular anti-reverse groove on the inner step of the tapered sleeve. The annular protrusion is adapted to the anti-reverse groove.

[0008] In an optional implementation, the number of the inner steps is at least one; The number of outer steps matches the number of inner steps.

[0009] In optional implementations, a backstop structure is also included; The anti-reverse structure includes an annular protrusion on the outer conical surface of the locking plate assembly and an annular anti-reverse groove on the inner conical surface of the conical sleeve. The annular protrusion is adapted to the anti-reverse groove.

[0010] In an optional embodiment, the axial cross-sectional shape of the annular protrusion is triangular, semi-circular, or arc-shaped; The shape of the anti-reverse groove is adapted to the shape of the annular protrusion.

[0011] In an optional implementation, the teeth are arranged in a spiral.

[0012] In an optional implementation, the teeth are threaded.

[0013] In an optional embodiment, a locking gap is provided between the locking plates.

[0014] In an optional implementation, the number of locking plates is two or three.

[0015] The beneficial effects of this utility model are: Friction self-locking is achieved through the engagement of the tapered hole and the outer tapered surface of the locking plate assembly. This eliminates the need for on-site hot work, pre-threading, or heavy hydraulic equipment, avoiding the quality fluctuations caused by environmental weather conditions during welding. It also avoids the stringent requirements of threaded sleeves on installation space and rebar alignment. It can flexibly adapt to scenarios with dense reinforcement and limited operating space in modular construction. At the same time, it does not rely on bulky extrusion molds. It only requires simple assembly to achieve a tight connection through teeth and friction self-locking, greatly reducing the dependence on construction equipment, improving the convenience of operation and construction efficiency. It does not require rotating rebar, making it more suitable for modular construction, easier to install, requiring less operating space, and having high connection efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the self-locking joint structure of the reinforcing bars provided in this embodiment of the utility model; Figure 2 for Figure 1 The first type of AA sectional view; Figure 3 for Figure 1 The second type of AA sectional view; Figure 4 for Figure 3 A sectional view of the tapered sleeve in the middle; Figure 5 for Figure 3 A cross-sectional view of the locking piece; Figure 6 for Figure 1 The third type of AA sectional view; Figure 7 for Figure 6 A sectional view of the conical sleeve; Figure 8 for Figure 6 A three-dimensional structural diagram of the locking plate; Figure 9 A side view of the self-locking joint for reinforcing bars provided in this embodiment of the utility model.

[0018] Icons: 1-conical sleeve; 2-reinforcing bar; 3-locking plate; 4-tooth; 5-inner step; 6-transition section; 7-outer step; 8-annular protrusion; 9-anti-reverse groove. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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 utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The following is combined Figures 1-9 The following describes some embodiments of the present invention in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] This utility model provides a self-locking connector for reinforcing bars, including a conical sleeve 1 and a set of locking plates 3; the conical sleeve 1 has a coaxially arranged conical hole; the set of locking plates 3 includes a ring composed of multiple locking plates 3, the outer periphery of the set of locking plates 3 is a conical surface matching the conical hole, and the inner periphery of the locking plates 3 is provided with teeth 4 that can connect with reinforcing bars 2; the set of locking plates 3 and the conical sleeve 1 can achieve a tight connection between the connector and the reinforcing bars 2 through frictional self-locking.

[0027] In this embodiment, a tapered hole is coaxially provided on the tapered sleeve 1 to ensure that the locking plate 3 group will not tilt due to uneven force after insertion, resulting in local stress concentration, which will not affect the self-locking effect and avoid cracking of the tapered sleeve 1 or deformation of the locking plate 3.

[0028] In this embodiment, the locking plate group 3 is composed of multiple locking plates 3 forming a ring. The outer periphery is a conical surface that matches the conical hole, and the inner periphery is provided with teeth 4. The multi-piece splicing structure is a prerequisite for realizing the shrinking function of the locking plate group 3. If it is an integral ring, it cannot shrink towards the center and cannot adapt to steel bars 2 of different diameters or generate sufficient biting force on the steel bars 2. The matching setting of the outer conical surface and the conical hole can ensure the basis for uniform transmission of radial extrusion force and avoid stress imbalance caused by fitting gap.

[0029] Specifically, in this embodiment, the tapered sleeve 1 can provide radial compressive force to the locking plate group 3. When the locking plate group 3 drives the reinforcing bar 2 to be inserted into the tapered hole and applies axial force, the tapered hole converts the axial force into radial compressive force, providing power for the contraction of the locking plate group 3.

[0030] The locking plate group 3 functions in two ways: first, it transmits the compressive force, transferring the radial force applied by the cone sleeve 1 to the teeth 4, causing the teeth 4 to embed into the surface of the reinforcing bar 2; second, it achieves a locking engagement, where the engagement between the teeth 4 and the reinforcing bar 2 prevents axial movement of the reinforcing bar 2, while the static friction between the locking plate group 3 and the cone sleeve 1 prevents the locking plate group 3 from moving with the reinforcing bar 2. Together, they achieve a tight connection. The entire structure requires no additional fasteners, achieving the connection solely through its own structural cooperation, simplifying the construction process.

[0031] When the locking plate group 3 moves along the tapered hole under axial force, static friction is generated between the tapered surface of the tapered hole and the outer tapered surface of the locking plate group 3. At the same time, the radial extrusion force causes the locking plate group 3 to contract, and the teeth 4 embed into the surface of the reinforcing bar 2 to form a mechanical engagement. The static friction and mechanical engagement work together to form a self-locking state. When the reinforcing bar 2 is under tension, it will drive the locking plate group 3 to move outward. At this time, the static friction increases, preventing the locking plate group 3 from moving. At the same time, the engagement of the teeth 4 with the reinforcing bar 2 further restricts relative sliding, thereby achieving a tight connection between the joint and the reinforcing bar 2. The greater the tension, the stronger the static friction and engagement force, and the more stable the connection.

[0032] In an optional embodiment, the inner conical surface of the tapered sleeve 1 is provided with at least one inner step 5, and the tapered surface of the locking plate 3 group is provided with an outer step 7 that is adapted to the inner step 5 of the tapered sleeve 1; the inner step 5 and the outer step 7 abut against each other, which can reduce the springback after the joint is installed.

[0033] In this embodiment, the inner step 5 is a continuous annular protrusion structure. The inner step 5 and the cone sleeve 1, and the outer step 7 and the locking plate 3 are all integrated designs. The inner step 5 and the outer step 7 are compatible, including matching in size and shape. If the size does not match, gaps or interference will occur, and effective contact cannot be achieved; if the shapes do not match, such as the inner step 5 being rectangular and the outer step 7 being trapezoidal, the force-bearing surface will be reduced, affecting the anti-rebound effect.

[0034] The inner step 5 and outer step 7 reduce springback after joint installation. During joint installation, the locking plate group 3 and the cone sleeve 1 undergo elastic deformation under axial and radial forces. After installation, the material tends to elastically recover, causing the locking plate group 3 to move in the opposite direction, i.e., springback. Springback can loosen the engagement between the teeth 4 and the reinforcing bar 2, affecting connection stability. The inner step 5, through rigid contact with the outer step 7, provides axial resistance to the locking plate group 3, counteracting its elastic recovery force and limiting its reverse movement, thereby reducing springback. Simultaneously, the step contact also positions the locking plate group 3 within the cone sleeve 1, ensuring consistent positioning after each assembly, avoiding fluctuations in connection strength due to assembly position deviations, and improving construction consistency.

[0035] In this embodiment, the inner step 5 is provided so that the inside of the tapered sleeve 1 forms two different apertures, and the two different apertures are connected by a tapered transition section 6.

[0036] In an optional embodiment, a backstop structure is also included; the backstop structure includes an annular protrusion 8 disposed on the outer step 7 of the locking plate 3 group and an annular backstop groove 9 formed on the inner step 5 of the tapered sleeve 1; the annular protrusion 8 is adapted to the backstop groove 9.

[0037] In this embodiment, the anti-reverse structure includes an annular protrusion 8 on the outer step 7 of the locking plate 3 and an annular anti-reverse groove 9 on the inner step 5 of the cone sleeve 1.

[0038] Specifically, in this embodiment, the annular protrusions 8 are continuously distributed circumferentially along the outer surface of the locking piece 3, which is crucial for ensuring uniform mechanical locking.

[0039] The annular anti-reverse groove 9 and the annular protrusion 8 are perfectly matched in position, shape, and size. The groove depth and width need to be precisely designed. If the groove depth is too shallow, the annular protrusion 8 cannot be fully embedded, resulting in insufficient locking force; if the groove depth is too deep, the annular protrusion 8 is prone to sinking into the groove and being unable to detach; if the groove width is too wide, there will be a gap between the annular protrusion 8 and the groove wall, making it prone to loosening; if the groove width is too narrow, the annular protrusion 8 cannot be embedded, resulting in interference. The structural design of the annular protrusion 8 and the anti-reverse groove 9 must be coordinated with the step structure to ensure that the setting of the annular protrusion 8 does not affect the abutment function of the step, and that the opening of the anti-reverse groove 9 does not weaken the strength of the inner step 5.

[0040] The core function of the anti-loosening structure is to prevent the joint from loosening when subjected to axial tensile force or vibration load. In modular construction, the reinforcing bar 2 often bears dynamic forces such as hoisting loads and seismic loads. The anti-rebound effect of the step alone cannot completely prevent loosening. Dynamic forces will cause slight displacement of the step abutment surface, which may lead to loosening of the engagement between the teeth 4 and the reinforcing bar 2 under long-term action. The annular protrusion 8 and the annular anti-loosening groove 9 form a mechanical lock. When the reinforcing bar 2 is subjected to tension and moves the locking plate group 3 outward, the protrusion will embed into the anti-loosening groove 9. The sidewall of the anti-loosening groove 9 generates a reverse blocking force on the protrusion, preventing the locking plate group 3 from moving. This locking force is much greater than the static friction force of the step abutment and can effectively resist dynamic loads. At the same time, the anti-loosening structure can also limit the radial displacement of the locking plate group 3, avoiding the tilting of the locking plate group 3 due to dynamic loads, further improving the connection stability.

[0041] In an optional embodiment, the number of inner steps 5 is at least one; the number of outer steps 7 matches the number of inner steps 5.

[0042] In this embodiment, for small-diameter steel bars 2, the abutting force of a single set of steps is sufficient to offset the elastic restoring force of the locking plate group 3, effectively preventing rebound. For large-diameter steel bars 2, the locking plate group 3 experiences greater radial compressive force, resulting in more significant elastic deformation and a correspondingly increased rebound. The abutting force of a single set of steps cannot completely limit the rebound. In this case, two sets of steps can disperse the abutting force, jointly offsetting the restoring force through two contact points, further reducing the rebound. Simultaneously, multiple sets of steps can enhance the connection stability between the locking plate group 3 and the cone sleeve 1, preventing deformation of a single set of steps due to excessive local stress and extending the service life of the joint. Furthermore, matching the number of steps improves the operability of construction. Construction personnel can quickly determine whether the assembly is in place based on the number of steps (e.g., two sets of steps need to feel two increases in thrust), reducing assembly errors.

[0043] In an optional embodiment, a backstop structure is also included; the backstop structure includes an annular protrusion 8 disposed on the outer conical surface of the locking plate 3 group and an annular backstop groove 9 formed on the inner conical surface of the conical sleeve 1; the annular protrusion 8 is adapted to the backstop groove 9.

[0044] In this embodiment, a backstop structure is directly provided on the outer conical surface of the locking plate group 3 and the inner conical surface of the conical sleeve 1. The annular protrusion 8 is provided on the outer conical surface to ensure that it does not affect the fit between the locking plate group 3 and the conical sleeve 1. That is, the height of the annular protrusion 8 is less than the fit gap between the conical sleeve 1 and the locking plate group 3 before assembly. If the height is too large, the locking plate group 3 will not be able to be inserted into the conical sleeve 1. The position of the annular protrusion 8 should be close to the assembly end point of the locking plate group 3 to ensure that it can be smoothly embedded into the backstop groove 9 during assembly.

[0045] Even without steps, a separate anti-rebound structure can effectively prevent rebound.

[0046] In an optional embodiment, the axial cross-sectional shape of the annular protrusion 8 is triangular, semi-circular, or arc-shaped; the shape of the anti-reverse groove 9 is adapted to the shape of the annular protrusion 8.

[0047] In this embodiment, protrusions and anti-reverse grooves 9 of different shapes correspond to different functional focuses in order to adapt to different stress scenarios.

[0048] Specifically, in this embodiment, the mating surface of the annular protrusion 8 with a triangular axial cross section and the anti-reverse groove 9 is a plane, which results in uniform pressure distribution under stress and the ability to transmit greater tensile force, making it suitable for scenarios that bear large tensile forces; the mating surface of the annular protrusion 8 with a semi-circular axial cross section and the anti-reverse groove 9 is an arc surface, which can disperse stress under stress, with no obvious stress concentration points, good fatigue resistance, and is suitable for scenarios that bear vibration loads.

[0049] It is understood that in this embodiment, the axial cross-sectional shape of the annular protrusion 8 can be one of the above-mentioned shapes, but it is not limited to the above-mentioned shapes. It can also be other shapes, such as trapezoids, as long as it can achieve the anti-reverse function.

[0050] In an optional embodiment, the teeth 4 are arranged in a spiral.

[0051] In this embodiment, the teeth 4 are arranged in a spiral, and the spiral direction is consistent with the external thread direction of the reinforcing bar 2, so as to better contact with the reinforcing bar 2, increase the contact area, improve the uniformity and stability of the biting force, and enhance the pull-out resistance of the joint.

[0052] The spirally arranged teeth 4 provide line contact with a large contact area, distributing the biting force to the surface of the rebar 2. The stress at each contact point is low, preventing localized damage to the rebar 2. Simultaneously, the line contact provides a more stable bite; even if there are minor unevennesses on the surface of the rebar 2, the spiral teeth 4 can compensate through multi-line contact, ensuring stable overall biting force. Furthermore, the spiral arrangement enhances the joint's torsional resistance. When the rebar 2 is subjected to torque, the spiral teeth 4 form torsional resistance with the surface of the rebar 2, limiting the rotation of the rebar 2 relative to the joint and improving the overall stability of the connection.

[0053] It is understood that in this embodiment, the teeth 4 are arranged in a spiral, but it is not limited to this method. It can also be arranged in a ring, etc., as long as it can achieve the interlocking between the locking plate 3 and the reinforcing bar 2.

[0054] In an optional embodiment, the tooth 4 is threaded.

[0055] In this embodiment, the tooth 4 is set in the form of a thread, that is, there is an internal thread on the inner hole sidewall of the locking plate 3 group composed of locking plates 3.

[0056] This design further enhances the interlocking force and anti-loosening effect, achieving bidirectional locking. Compared with ordinary spiral teeth 4, the threaded teeth 4 have a tighter interlock with the surface of the reinforcing bar 2, similar to the fit between a bolt and a nut. This not only prevents the reinforcing bar 2 from being pulled out axially, but also prevents the reinforcing bar 2 from being pushed into the joint, achieving bidirectional locking. This is particularly important for the precise positioning of the reinforcing bar 2 in modular construction. For example, when splicing precast components, the reinforcing bar 2 needs to be fixed in a specific position and cannot be pushed in or pulled out arbitrarily.

[0057] Meanwhile, the threaded teeth 4 increase friction, making it less prone to loosening even under vibration loads, thus improving the long-term stability of the joint. Furthermore, the high machining precision of the threaded teeth 4 ensures consistency between different batches of joints, facilitating standardized construction and reducing assembly errors.

[0058] In an optional embodiment, a locking gap is provided between the locking plates 3.

[0059] In this embodiment, the locking gap is the gap between the splicing surfaces of adjacent locking plates 3, and the locking gap has two characteristics: uniformity and continuity.

[0060] Uniformity means that the gap widths of the three locking plates in the same group are the same. If the gaps are not uniform, the locking plate 3 with the narrow gap will close first during contraction, and the locking plate 3 with the wide gap will close later, resulting in uneven force on the three locking plates and the inability of the teeth 4 to mesh with the steel bar 2 in some areas. Continuity means that the gaps must be continuously distributed along the splicing surface. If there are no gaps in some areas, the locking plate group 3 will be unable to contract in some areas, resulting in jamming.

[0061] The gap width needs to be calculated and determined based on the number of locking plates 3 and the diameter of the reinforcing bar 2 to ensure that the teeth 4 can be fully embedded in the surface of the reinforcing bar 2 after the locking plates 3 are contracted, while avoiding excessive gaps that could cause the locking plates 3 to misalign.

[0062] In an optional implementation, the number of locking plates 3 is two or three.

[0063] In this embodiment, the locking piece 3 in the locking piece 3 group consists of two or three pieces. When the number is small, it is relatively easy to splice them together and also relatively easy to install.

[0064] It is understandable that the number of locking plates 3 in the locking plate group 3 can be two or three, or even more, as long as the locking plate 3 can guarantee the locking function of the reinforcing bar 2.

[0065] The beneficial effects of this utility model are: Friction self-locking is achieved through the engagement of the tapered hole and the three sets of outer tapered surfaces of the locking plate. This eliminates the need for on-site hot work, pre-threading, or heavy hydraulic equipment, avoiding the quality fluctuations caused by environmental weather conditions during welding. It also overcomes the stringent requirements of threaded sleeves on installation space and the alignment of the reinforcing bars 2. It can flexibly adapt to scenarios with dense reinforcement and limited operating space in modular construction. At the same time, it does not rely on bulky extrusion molds. It can achieve a tight connection through the teeth 4 and friction self-locking with simple assembly, which greatly reduces the dependence on construction equipment, improves the convenience of operation and construction efficiency, and eliminates the need to rotate the reinforcing bars 2. It is more suitable for modular construction, easier to install, requires less operating space, and has high connection efficiency.

[0066] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A self-locking joint for reinforcing bars, characterized in that, Includes tapered sleeves and locking plate assemblies; The tapered sleeve has a coaxially arranged tapered hole; The locking plate group comprises a ring composed of multiple locking plates. The outer periphery of the locking plate group has a tapered surface that matches the tapered hole, and the inner periphery of the locking plate is provided with teeth that can be connected to the reinforcing bar. The locking plate assembly and the tapered sleeve achieve a tight connection between the joint and the reinforcing bar through friction self-locking.

2. The self-locking rebar joint according to claim 1, characterized in that, The inner conical surface of the cone sleeve is provided with at least one inner step, and the conical surface of the locking plate assembly is provided with an outer step that matches the inner step of the cone sleeve. The inner step and the outer step abut against each other, which can reduce the springback after the joint is installed.

3. The self-locking rebar joint according to claim 2, characterized in that, It also includes a backstop structure; The anti-reverse structure includes an annular protrusion on the outer step of the locking plate assembly and an annular anti-reverse groove on the inner step of the tapered sleeve. The annular protrusion is adapted to the anti-reverse groove.

4. The self-locking connector according to claim 2, characterized in that, The number of the inner steps is at least one; The number of outer steps matches the number of inner steps.

5. The self-locking rebar joint according to claim 1, characterized in that, It also includes a backstop structure; The anti-reverse structure includes an annular protrusion on the outer conical surface of the locking plate assembly and an annular anti-reverse groove on the inner conical surface of the conical sleeve. The annular protrusion is adapted to the anti-reverse groove.

6. The self-locking rebar joint according to claim 3 or 5, characterized in that, The axial cross-sectional shape of the annular protrusion is triangular, semi-circular, or arc-shaped; The shape of the anti-reverse groove is adapted to the shape of the annular protrusion.

7. The self-locking rebar joint according to claim 1, characterized in that, The teeth are arranged in a spiral.

8. The self-locking rebar joint according to claim 7, characterized in that, The teeth are spiral-shaped.

9. The self-locking rebar joint according to claim 1, characterized in that, A locking gap is provided between the locking plates.

10. The self-locking rebar joint according to claim 1, characterized in that, The number of locking plates is two or three.

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