A new self-locking steel bar connecting sleeve

Abstract

The utility model provides a novel self -locking type reinforcing steel bar connecting sleeve, it includes connecting cylinder and spacing cylinder, the lateral wall of connecting cylinder is equipped with the interspace of inside and outside through -going, be equipped with self -locking clamping plate in the interspace, spacing cylinder is equipped with in connecting cylinder outside, it can change the included angle between self -locking clamping plate and connecting cylinder axis with the axial movement of connecting cylinder, the axial end part of connecting cylinder is detachably connected positioning cylinder, be equipped with the reducing through -groove in positioning cylinder, by the axial end part to the middle part of connecting cylinder, the inner diameter of reducing through -groove gradually reduces. The utility model's simple structure, the quickness of installation and removal, the good connection quality, positioning cylinder can guarantee the quick insertion of reinforcing steel bar, the coaxial degree of reinforcing steel bar and connecting cylinder, and the cooperation of spacing cylinder and self -locking clamping plate can guarantee the position stability of reinforcing steel bar.

Description

Technical Field

[0001] This utility model relates to the field of building technology, and in particular to a novel self-locking rebar connecting sleeve. Background Technology

[0002] Precast concrete structure engineering involves transporting prefabricated and cured concrete components from a factory to the construction site, hoisting them into place, and then connecting and pouring concrete to form a complete building structure. The reliability of the connections between components is fundamental to the overall integrity and safety of the structure. Existing steel reinforcement connection technologies used for precast components suffer from drawbacks such as slow connection speed and unstable connections.

[0003] Utility model CN216130448U discloses a self-locking rebar connection sleeve, comprising an inner sleeve, a clamp, an outer sleeve, and a washer. Two inner sleeves are fitted inside the outer sleeve. Each inner sleeve has an open end and a closed end. The clamp is installed inside each inner sleeve. The washer, which has a stepped structure, is inserted into the closed end of the inner sleeve and makes effective contact with the inner wall of the inner sleeve. The inner wall of the inner sleeve has a slope, with the slope angle between 15° and 25° to the sleeve axis. The outer surface of the clamp is tangent to the inner wall of the inner sleeve. This sleeve makes rebar connection more convenient and faster, improves work efficiency, ensures a firm and stable rebar connection, and the sleeve itself has higher load-bearing capacity, reducing secondary processing of the rebar.

[0004] However, existing sleeves employ a multi-part assembly structure consisting of an inner sleeve, clamps, an outer sleeve, and washers. During installation, the clamps must first be inserted into the constricted end of the inner sleeve, then the stepped washer is inserted, and finally, the two inner sleeves are screwed into the outer sleeve. In this process, the symmetrical installation accuracy of the clamps relies on manual alignment. If the convex end of the washer is not fully engaged with the inner wall of the inner sleeve, uneven force on the clamps can easily occur, affecting the self-locking effect. For example, during high-frequency operations on construction sites, operators may miss installing washers or fail to tighten the inner sleeves due to fatigue, causing the clamps to loosen after the rebar is inserted, leading to a risk of connection failure. Furthermore, the threaded fit between the inner and outer sleeves requires rotation to a specific position to ensure the clamp slope aligns with the rebar ribs, which is time-consuming and difficult to position quickly. Utility Model Content

[0005] The purpose of this invention is to provide a novel self-locking rebar connection sleeve to address the shortcomings in the aforementioned background technology.

[0006] The technical solution of this utility model is: a novel self-locking rebar connecting sleeve, comprising:

[0007] A connecting cylinder, wherein the side wall of the connecting cylinder is provided with an inner and outer through groove, and a self-locking plate is provided in the groove;

[0008] A limiting cylinder is sleeved outside the connecting cylinder and can move along the axial direction of the connecting cylinder to change the angle between the self-locking plate and the axis of the connecting cylinder.

[0009] Preferably, along the axial direction of the connecting cylinder, the self-locking plate has a movable end and a connecting end positioned opposite each other. The movable end is away from the axial end of the connecting cylinder and inclined toward the axis of the connecting cylinder; the connecting end is close to the axial end of the connecting cylinder and connects to the inner wall of the slot.

[0010] Preferably, there are several slots and self-locking plates distributed around the circumference of the connecting cylinder.

[0011] Preferably, the inner wall of the limiting cylinder is provided with a pressing block, the pressing block having a pressing inclined surface facing the self-locking plate; from the axial end of the connecting cylinder towards the center, the distance between the pressing inclined surface and the inner wall of the limiting cylinder gradually increases.

[0012] Preferably, the limiting cylinder includes a first cylinder section and a second cylinder section that are rotatably connected, the clamping block is disposed on the first cylinder section, and the second cylinder section is threadedly connected to the connecting cylinder.

[0013] Preferably, the shaft end of the connecting cylinder is detachably connected to the positioning cylinder, and the positioning cylinder is provided with a variable diameter through groove; the inner diameter of the variable diameter through groove gradually decreases from the shaft end of the connecting cylinder towards the middle.

[0014] Preferably, the shaft end of the connecting cylinder is provided with a first flange plate, and the outside of the positioning cylinder is fitted with a second flange plate, and the first flange plate and the second flange plate are connected by a connecting bolt.

[0015] Preferably, the outer diameter of the positioning cylinder is less than or equal to the inner diameter of the connecting cylinder, and the positioning cylinder is at least partially inserted into the connecting cylinder.

[0016] The beneficial effects of this utility model include: the connecting sleeve has a simple structure, is quick to install and disassemble, and has good connection quality. The variable diameter through groove can ensure the rapid insertion of the reinforcing bar, and after the positioning cylinder and the connecting cylinder are connected, the coaxiality of the reinforcing bar and the connecting cylinder can be guaranteed, that is, the coaxiality of the reinforcing bars located at both ends of the connecting cylinder can be guaranteed. Then, through the cooperation of the limiting cylinder and the self-locking plate, the reinforcing bar is fixed in the connecting cylinder, which can ensure the positional stability of the reinforcing bar and improve the construction quality of the subsequent post-pouring strip. Attached Figure Description

[0017] Figure 1 This is an overall structural diagram of an embodiment of the present utility model;

[0018] Figure 2 This is a structural diagram of the connecting cylinder in an embodiment of this utility model;

[0019] Figure 3 This is a structural diagram of the positioning cylinder in an embodiment of this utility model;

[0020] Figure 4 This is a structural diagram of the limiting cylinder in an embodiment of this utility model;

[0021] Figure 5 This is a schematic diagram showing the connection between the clamping block and the self-locking plate in an embodiment of this utility model;

[0022] In the picture:

[0023] 1. Connecting cylinder; 11. Empty groove;

[0024] 2. Positioning cylinder; 21. Variable diameter through groove; 22. Guide slope;

[0025] 3. Limiting cylinder; 31. First cylinder section; 32. Second cylinder section;

[0026] 4. Self-locking plate; 41. Movable end; 42. Connecting end;

[0027] 5. First flange plate; 51. Connection hole;

[0028] 6. Second flange plate;

[0029] 7. Connecting bolt; 71. Screw; 72. Nut;

[0030] 8. Clamping block; 81. Clamping ramp. Detailed Implementation

[0031] The technical solutions of the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0032] In the description of the embodiments of this utility model, it should be understood that the terms "top," "bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, it should be noted that unless otherwise expressly specified and limited, the terms "set" and "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model through specific circumstances.

[0033] Reference Appendix Figure 1-4This utility model provides a novel self-locking rebar connecting sleeve, which includes a connecting sleeve 1, a positioning sleeve 2, and a limiting sleeve 3. Two sets of positioning sleeves 2 and 3 are provided. The positioning sleeve 2 is detachably mounted on the axial end of the connecting sleeve 1, and the two sets of positioning sleeves 2 are located at opposite ends of the connecting sleeve 1. A variable diameter through groove 21 is provided inside the positioning sleeve 2, coaxial with the positioning sleeve 2. The inner diameter of the variable diameter through groove 21 gradually decreases from the axial end of the connecting sleeve 1 towards the center. Two sets of through-hole grooves 11 are provided on the side wall of the connecting sleeve 1, respectively located near different positioning sleeves 2. Each set of through-hole grooves 11 contains a self-locking plate 4. Two sets of limiting sleeves 3 are respectively positioned corresponding to the through-hole grooves 11 and sleeved around the connecting sleeve 1. The limiting sleeve 3 can move axially along the connecting sleeve 1 to change the angle between the self-locking plate 4 and the axis of the connecting sleeve 1.

[0034] The above-mentioned method of using the connecting sleeve includes the following steps: insert the reinforcing bar into the large diameter end of the reducing groove 21 and extend it out from the small diameter end of the reducing groove 21; connect and fasten the positioning cylinder 2 to the connecting cylinder 1, push the reinforcing bar inward into the connecting cylinder 1 so that the end of the reinforcing bar extending out from the small diameter end of the reducing groove 21 extends into the connecting cylinder 1; move the limiting cylinder 3 so that the included angle between the self-locking plate 4 and the axis of the connecting cylinder 1 becomes smaller, and use the self-locking plate 4 to press the reinforcing bar tightly to prevent it from axial displacement, thus completing the reinforcing bar connection.

[0035] Compared with existing technologies, the above-mentioned connecting sleeve has a simple structure, is quick to install and disassemble, and has good connection quality. The variable diameter through groove 21 can ensure the rapid insertion of the reinforcing bar, and after the positioning cylinder 2 is connected to the connecting cylinder 1, it can ensure the coaxiality of the reinforcing bar and the connecting cylinder 1, that is, ensure the coaxiality of the reinforcing bars at both ends of the connecting cylinder 1. Then, through the cooperation of the limiting cylinder 3 and the self-locking plate 4, the reinforcing bar is fixed in the connecting cylinder 1, which can ensure the positional stability of the reinforcing bar and improve the construction quality of the subsequent post-pouring strip.

[0036] In this embodiment, the inner diameter of the large-diameter end of the variable-diameter through groove 21 is larger than the diameter of the reinforcing bar. The small-diameter end of the variable-diameter through groove 21 is fitted with the reinforcing bar with a clearance. The clearance is sufficient to satisfy the axial movement freedom of the reinforcing bar in the variable-diameter through groove, and does not need to be larger. The large-diameter end can improve the insertion efficiency of the reinforcing bar. Through the oblique guidance of the inner wall of the variable-diameter through groove 21, the reinforcing bar can quickly extend from the small-diameter end. The clearance fit between the small-diameter end and the reinforcing bar can not only satisfy the axial movement freedom of the reinforcing bar, but also the inner wall of the small-diameter end can calibrate the axial direction of the reinforcing bar through its interaction with the outer wall of the reinforcing bar, making it coaxial with the variable-diameter through groove 21 and the positioning cylinder 2. This ensures that after the positioning cylinder 2 is connected to the connecting cylinder 1, the reinforcing bars at both ends of the connecting cylinder 1 are coaxial.

[0037] In this embodiment, the outer diameter of the positioning cylinder 2 is less than or equal to the inner diameter of the connecting cylinder 1, and the positioning cylinder 2 is at least partially inserted into the connecting cylinder 1. The shaft end of the connecting cylinder 1 is provided with a first flange plate 5, and the outside of the positioning cylinder 2 is fitted with a second flange plate 6. The first flange plate 5 and the second flange plate 6 are connected by a connecting bolt 7. By coaxially configuring the connecting cylinder 1 and the first flange plate 5, and the positioning cylinder 2 and the second flange plate 6, and then precisely aligning and fastening the first flange plate 5 and the second flange plate 6, the coaxiality of the positioning cylinder 2 and the connecting cylinder 1 can be guaranteed, thereby ensuring the coaxiality of the reinforcing bars at both ends of the connecting cylinder 1.

[0038] In addition, in order to enable the positioning cylinder 2 to be quickly inserted into the connecting cylinder 1, a guide slope 22 can be provided at the end of the positioning cylinder 2 that extends into the connecting cylinder 1. The guide slope 22 is annular and coaxial with the positioning cylinder 2. Its diameter is larger on the side closer to the second flange plate 6 and smaller on the side farther away from the second flange plate 6.

[0039] Reference Appendix Figure 2-3 The first flange plate 5 has several connecting holes 51 distributed circumferentially, and the number and position of the connecting bolts 7 correspond to the connecting holes 51; the screw 71 in the connecting bolt 7 extends from the second flange plate 6 to the first flange plate 5, and after passing through the connecting hole 51, it is connected and tightened with the nut 72 in the connecting bolt 7.

[0040] In this embodiment: along the axial direction of the connecting cylinder 1, the self-locking plate 4 has a movable end 41 and a connecting end 42 positioned opposite each other. The movable end 41 is away from the axial end of the connecting cylinder 1 and inclined towards the axis of the connecting cylinder 1; the connecting end 42 is close to the axial end of the connecting cylinder 1 and connects to the inner wall of the slot 11. This configuration of the self-locking plate 4 allows for initial positioning of the reinforcing bar inserted into the connecting cylinder 1 before the limiting cylinder 3 exerts its limiting effect. Specifically, the outer wall of the reinforcing bar has spaced ribs. As the reinforcing bar extends into the connecting cylinder 1, the ribs protruding from the reinforcing bar body will lift the self-locking plate 4, causing its free end to move away from the axis of the connecting cylinder 1. As the reinforcing bar continues to extend, the rib that lifts the self-locking plate 4 will gradually move away from the self-locking plate 4, causing the free end of the self-locking plate 4 to gradually correspond to the reinforcing bar body between adjacent ribs. The reinforcing bar body is concave relative to the rib. The free end of the self-locking plate 4 falls back onto the reinforcing bar body due to the loss of its supporting function. Due to the tilted state of the self-locking plate 4 itself, it is now far away from the previous rib of the self-locking plate 4 and will form a preliminary engagement with the self-locking plate 4. This allows the reinforcing bar to continue moving in the direction of extending into the connecting cylinder 1 and repeat the above-mentioned lifting-falling-preliminary engagement action, but it cannot move in the direction of pulling out of the connecting cylinder 1. When the length of the reinforcing bar inserted into the connecting cylinder 1 meets the requirements, the limiting cylinder 3 can be operated to fix the self-locking plate 4 and the reinforcing bar.

[0041] Reference Appendix Figure 2Each set of slots 11 has several distributed around the circumference of the connecting sleeve 1. Each slot 11 is equipped with a self-locking plate 4, which provides good circumferential restraint for the reinforcing bars. The number and size of the self-locking plates 4 can be configured according to actual needs. For example, if the ribs of some reinforcing bars are oblique and distributed in two sets, the self-locking plates 4 can be distributed in two sets around the circumference of the connecting sleeve 1 to respectively engage the two corresponding ribs. However, this requires slightly rotating the reinforcing bar when it is inserted into the connecting sleeve so that the two sets of self-locking plates 4 correspond to the two different sets of ribs. Of course, more than two sets of self-locking plates 4 can also be set, such as 4 sets, 6 sets, 8 sets or more, so that no matter which direction the reinforcing bar is inserted into the connecting sleeve 1, two self-locking plates 4 can quickly engage with its two different sets of ribs. At this time, whether other self-locking plates 4 are in contact with the reinforcing bar ribs or not does not affect the use of this connecting sleeve.

[0042] In this embodiment, the limiting cylinder 3 includes a first cylinder section 31 and a second cylinder section 32. The first cylinder section 31 and the second cylinder section 32 are dispersed along their own axial direction, and their adjacent shaft ends are rotatably connected. The inner wall of the first cylinder section 31 is provided with a pressing block 8, which extends into the empty groove 11 on the connecting cylinder 1. The length of the empty groove 11 is greater than the length of the pressing block 8, so as to provide sufficient space for the pressing block 8 to move along the axial direction of the connecting cylinder 1. The pressing block 8 has a pressing inclined surface 81 facing the self-locking plate 4. From the shaft end of the connecting cylinder 1 towards the middle, the distance between the pressing inclined surface 81 and the inner wall of the limiting cylinder 3 gradually increases. The inner wall of the second cylinder section 32 and the outer wall of the connecting cylinder 1 are provided with matching threads, and the two are threaded together.

[0043] In this embodiment, the rotational connection between the first cylindrical section 31 and the second cylindrical section 32 is a well-known technique in the art. For example, they can be connected by a slewing bearing. The connection scheme is not specifically limited here. The number of first cylindrical sections 31 is not limited. They can be provided at only one end of the second cylindrical section 32, or one can be provided at each end of the second cylindrical section 32. Only the clamping block 8 needs to be provided on the first cylindrical section 31 corresponding to the empty groove 11, while the other first cylindrical section is used to improve the connection stability between the limiting cylinder 3 and the connecting cylinder 1.

[0044] In practice, by rotating the second cylindrical section 32, the first cylindrical section 31 can be pulled or pushed, causing the first cylindrical section 31 to move axially along the connecting cylinder 1. This, in turn, drives the clamping block 8 to move axially along the connecting cylinder 1, causing the clamping inclined surface 81 to press against the self-locking plate 4 (see attached diagram). Figure 5 Alternatively, it can be separated from the self-locking plate 4, thereby pressing the self-locking plate 4 against the reinforcing bar, or the self-locking plate 4 can be released.

[0045] Compared with the prior art, the present invention has at least the following beneficial effects: the structure of the connecting sleeve is simple, quick to install and disassemble, and has good connection quality. The variable diameter through groove 21 can ensure the rapid insertion of the reinforcing bar, and after the positioning cylinder 2 is connected to the connecting cylinder 1, it can ensure the coaxiality of the reinforcing bar and the connecting cylinder 1, that is, ensure the coaxiality of the reinforcing bars at both ends of the connecting cylinder 1. Then, through the cooperation of the limiting cylinder 3 and the self-locking plate 4, the reinforcing bar is fixed in the connecting cylinder 1, which can ensure the positional stability of the reinforcing bar and improve the construction quality of the subsequent post-pouring strip.

[0046] The above are preferred embodiments of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A novel self-locking rebar connecting sleeve, characterized in that, include: A connecting cylinder, wherein the side wall of the connecting cylinder is provided with an inner and outer through groove, and a self-locking plate is provided in the groove; A limiting cylinder is sleeved outside the connecting cylinder and can move along the axial direction of the connecting cylinder to change the angle between the self-locking plate and the axis of the connecting cylinder.

2. The novel self-locking rebar connecting sleeve according to claim 1, characterized in that, Along the axial direction of the connecting cylinder, the self-locking plate has a movable end and a connecting end positioned opposite each other. The movable end is away from the axial end of the connecting cylinder and inclined toward the axis of the connecting cylinder; the connecting end is close to the axial end of the connecting cylinder and is connected to the inner wall of the slot.

3. The novel self-locking rebar connecting sleeve according to claim 2, characterized in that, The empty slots and the self-locking plates are distributed in several directions around the connecting cylinder.

4. The novel self-locking rebar connecting sleeve according to claim 2 or 3, characterized in that, The inner wall of the limiting cylinder is provided with a pressing block, and the pressing block has a pressing inclined surface facing the self-locking plate; from the axial end of the connecting cylinder towards the middle, the distance between the pressing inclined surface and the inner wall of the limiting cylinder gradually increases.

5. The novel self-locking rebar connecting sleeve according to claim 4, characterized in that, The limiting cylinder includes a first cylinder section and a second cylinder section that are rotatably connected. The clamping block is disposed on the first cylinder section, and the second cylinder section is threadedly connected to the connecting cylinder.

6. The novel self-locking rebar connecting sleeve according to any one of claims 1-3 and 5, characterized in that, The shaft end of the connecting cylinder is detachably connected to the positioning cylinder, and the positioning cylinder is provided with a variable diameter through groove; from the shaft end of the connecting cylinder towards the middle, the inner diameter of the variable diameter through groove gradually decreases.

7. The novel self-locking rebar connecting sleeve according to claim 6, characterized in that, The connecting cylinder has a first flange plate at its shaft end, and the positioning cylinder has a second flange plate sleeved on its outside. The first flange plate and the second flange plate are connected by a connecting bolt.

8. The novel self-locking rebar connecting sleeve according to claim 7, characterized in that, The outer diameter of the positioning cylinder is less than or equal to the inner diameter of the connecting cylinder, and the positioning cylinder is at least partially inserted into the connecting cylinder.

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