Novel steel bar connecting sleeve

Abstract

The invention provides a novel steel bar connecting sleeve which comprises a sleeve body, two pairs of trapezoidal extrusion wedge blocks are arranged in an inner cavity and a guide groove in the middle of the sleeve body in a crossed mode, and two top shafts are symmetrically arranged on the lower bottom faces of the two first trapezoidal extrusion wedge blocks; one end of each top shaft is connected with the lower bottom surface of the corresponding first trapezoidal extrusion wedge block, and the other end of each top shaft is movably inserted into an inner cavity in one end of the sleeve body; two taper sleeves are symmetrically arranged outside the two ends of the sleeve body through threads; a self-locking inner conical surface is arranged at the outer end of the inner cavity of the conical sleeve; a compression spring and a locking plate with a multi-plate structure are arranged in an inner cavity of the taper sleeve, and the outer surface of the locking plate is a self-locking outer conical surface matched with the self-locking inner conical surface of the corresponding taper sleeve; in the initial state before steel bar connection, the locking piece is arranged at the outer end of the outer portion of the compression spring in a sleeving mode, and the compression spring is in a compressed state under the interaction of the self-locking inner conical surface and the self-locking outer conical surface. The method is easy and convenient to operate and high in connection speed, and residual deformation meets the standard.

Description

Technical Field

[0001] The invention relates to the technical field of steel bar connection, and in particular to a novel steel bar connection sleeve. Background Art

[0002] In nuclear power, construction and other engineering fields, the quality of steel bar connections is related to structural safety, and the connection efficiency affects the construction progress. At present, ordinary straight thread sleeves and quick-insert sleeves are the mainstream connection methods, each of which has obvious shortcomings. When ordinary straight thread sleeves are used to connect steel bars, workers need to manually rotate them several times to make the steel bar connection meet the specified torque requirements. This construction process is cumbersome, labor-intensive, and time-consuming, which affects work efficiency. Although the quick-insert sleeve is easy to connect and fast, it can improve construction efficiency to a certain extent. However, in actual applications, it is found that the residual deformation of the steel bars connected by the quick-insert sleeve after bearing the load far exceeds the relevant standards, making it difficult to be widely used in nuclear power projects, limiting its application in engineering fields with high requirements for structural safety.

[0003] In view of this, there is an urgent need for a new type of steel bar connecting sleeve to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a new type of steel bar connecting sleeve in view of the deficiencies in the prior art, which is easy to operate, has a fast connection speed and the residual deformation meets the standards.

[0005] To solve the above technical problems, the present invention includes:

[0006] A novel steel bar connecting sleeve comprises a sleeve body with an axial hollow structure, and two guide grooves are symmetrically provided in the middle part of the sleeve body and along the second direction L2, both of which are connected to the inner cavity of the sleeve body; two pairs of trapezoidal extrusion wedges are cross-arranged in the inner cavity and the guide grooves in the middle part of the sleeve body, two first trapezoidal extrusion wedges are arranged oppositely and slidingly along the first direction L1, two second trapezoidal extrusion wedges are arranged oppositely and slidingly along the second direction L2, and the second extrusion inclined surfaces of the two second trapezoidal extrusion wedges are respectively in contact with the first extrusion inclined surfaces of the two first trapezoidal extrusion wedges; the first direction L1 is the axis of the sleeve body, and the second direction L2 is a radial direction of the sleeve body; two top shafts are symmetrically provided on the lower bottom surfaces of the two first trapezoidal extrusion wedges and along the first direction L1; the top shafts One end is connected to the lower bottom surface of the corresponding first trapezoidal extrusion wedge, and the other end of the top shaft is movably inserted in the inner cavity at one end of the sleeve body; two tapered sleeves are symmetrically arranged on the outside of the two ends of the sleeve body through threads; a self-locking inner conical surface is arranged at the outer end of the inner cavity of the tapered sleeve; a compression spring and a locking plate are arranged in the inner cavity of the tapered sleeve and along the first direction L1, the locking plate is a multi-plate structure, and the outer surface of the locking plate is a self-locking outer conical surface that matches the self-locking inner conical surface of the corresponding tapered sleeve; the inner diameter of the compression spring is equal to the diameter of the outer port of the inner cavity at one end of the sleeve body, the inner diameter of the compression spring is slightly larger than the outer diameter of the steel bar to be connected inserted therein, and the inner diameter of the locking plate is equal to the outer diameter of the compression spring; in the initial state before the steel bar is connected, the locking plate is sleeved on the outer end of the compression spring, and the compression spring is in a compressed state through the interaction between the self-locking inner conical surface and the self-locking outer conical surface.

[0007] Furthermore, the sleeve body is cylindrical in shape, and both ends of the sleeve body are provided with external threads, and the inner end of the inner cavity of the cone sleeve is provided with internal threads that match the external threads.

[0008] Furthermore, a cylindrical groove is provided in the middle portion of the first trapezoidal extrusion wedge along the first direction L1, and one end of the top shaft is inserted into the corresponding cylindrical groove.

[0009] Furthermore, the two second trapezoidal extrusion wedges are connected by fastening bolts arranged along the second direction L2; a fastening bolt countersunk hole is opened in the middle part of one of the second trapezoidal extrusion wedges and along the second direction L2, and a fixing threaded hole is opened in the middle part of the other second trapezoidal extrusion wedge and along the second direction L2.

[0010] Furthermore, the inner surface of the locking plate is provided with a plurality of annular engaging teeth.

[0011] Furthermore, the inner cavities at both ends of the sleeve body include a large guide hole and a small guide hole, both of which are cylindrical; the top shaft has a large guide cylindrical portion and a small guide cylindrical portion, and the large guide cylindrical portion and the small guide cylindrical portion are respectively matched with the corresponding large guide hole and small guide hole; the inner diameter of the compression spring is equal to the diameter of the large guide hole.

[0012] Furthermore, in the initial state before the steel bars are connected, the outer end of the large guide cylindrical portion of the top shaft protrudes from the outer end of the corresponding large guide hole.

[0013] The beneficial effects of the present invention are:

[0014] The present invention provides a new type of steel bar connection sleeve that can achieve efficient connection, reduce the labor intensity of workers, and ensure that the residual deformation meets the standard. The present invention uses the rapid extrusion action of two pairs of trapezoidal extrusion wedges arranged in a cross shape to achieve the connection of steel bars. Compared with ordinary straight thread sleeves, there is no need for cumbersome, high-intensity multi-turn rotation operations, and the installation is convenient and efficient. In large-scale construction or nuclear power engineering construction, it can significantly shorten the project construction period and improve the overall construction efficiency.

[0015] The second extrusion slope of the second trapezoidal extrusion wedge is in contact with the first extrusion slope of the first trapezoidal extrusion wedge. When the second trapezoidal extrusion wedge slides relatively, the radial force can be converted into an axial force, pushing the top shaft to make the force act evenly on the steel bar, avoiding local stress concentration and residual deformation. In addition, the progressive steel bar clamping is achieved through the extrusion of the inclined surfaces of the two pairs of trapezoidal extrusion wedges, which can better control the size and action process of the force, and avoid excessive deformation of the steel bar and the sleeve body caused by the instantaneous excessive extrusion force. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the steel bar connection sleeve of the present invention before installation;

[0017] Figure 2 This is a schematic diagram of the steel bar connection sleeve after installation of the present invention;

[0018] Figure 3 It is a schematic diagram of the sleeve body of the present invention;

[0019] Figure 4 yes Figure 3 AA section view;

[0020] In the figure: 1. sleeve body, 11. external thread, 12. large guide hole, 13. small guide hole, 14. guide groove; 2. top shaft, 21. large guide cylindrical part, 22. small guide cylindrical part; 3. second trapezoidal extrusion wedge, 31. bolt countersunk hole, 32. second extrusion inclined surface, 33. fixed threaded hole; 4. tapered sleeve, 41. internal thread, 42. self-locking inner cone; 5. locking plate, 51. occlusal teeth, 52. self-locking outer cone; 6. first trapezoidal extrusion wedge, 61. first extrusion inclined surface, 62. cylindrical groove; 7. fastening bolt, 8. compression spring, 9. fixed end steel bar, 10. movable end steel bar. DETAILED DESCRIPTION

[0021] To facilitate understanding of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that the embodiments are only intended to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0022] like Figure 1-3 As shown, the present invention provides a novel steel bar connecting sleeve, comprising a sleeve body 1 with an axial hollow structure, and two guide grooves 14 are symmetrically provided in the middle part of the sleeve body 1 and along the second direction L2, both of which are connected to the inner cavity of the sleeve body 1; two pairs of trapezoidal extrusion wedges are cross-arranged in the inner cavity of the middle part of the sleeve body 1 and the guide grooves 14, two first trapezoidal extrusion wedges 6 are relatively and slidably arranged along the first direction L1, two second trapezoidal extrusion wedges 3 are relatively and slidably arranged along the second direction L2, and the second extrusion inclined surfaces 32 of the two second trapezoidal extrusion wedges 3 are respectively in contact with the first extrusion inclined surfaces 61 of the two first trapezoidal extrusion wedges 6; the first direction L1 is the axis of the sleeve body 1, and the second direction is a radial direction of the sleeve body 1; two top shafts 2 are symmetrically provided on the lower bottom surfaces of the two first trapezoidal extrusion wedges 6 and along the first direction L1; the top shafts 2 is connected to the lower bottom surface of the corresponding first trapezoidal extrusion wedge 6, and the other end of the top shaft 2 is movably inserted in the inner cavity at one end of the sleeve body 1; two tapered sleeves 4 are symmetrically arranged on the outside of the two ends of the sleeve body 1 through threads; the outer end of the inner cavity of the tapered sleeve 4 is provided with a self-locking inner conical surface 42; a compression spring 8 and a locking plate 5 are arranged in the inner cavity of the tapered sleeve 4 and along the first direction L1, the locking plate 5 is a multi-piece structure, and the outer surface of the locking plate 5 is a self-locking outer conical surface 52 adapted to the self-locking inner conical surface 42 of the corresponding tapered sleeve 4; the inner diameter of the compression spring 8 is equal to the diameter of the outer port of the inner cavity at one end of the sleeve body 1, the inner diameter of the compression spring 8 is slightly larger than the outer diameter of the steel bar to be connected inserted therein, and the inner diameter of the locking plate 5 is equal to the outer diameter of the compression spring 8; in the initial state before the steel bar is connected, the locking plate 5 is sleeved on the outer end of the compression spring 8, and through the interaction between the self-locking inner conical surface 42 and the self-locking outer conical surface 52, the compression spring 8 is in a compressed state.

[0023] The sleeve body 1 is cylindrical in shape, and external threads 11 are provided at both ends of the sleeve body 1 . The inner end of the inner cavity of the tapered sleeve 4 is provided with internal threads 41 that match the external threads 11 .

[0024] A cylindrical groove 62 is formed in the middle of the first trapezoidal extrusion wedge 6 and along the first direction L1 , and one end of the top shaft 2 is inserted into the corresponding cylindrical groove 62 .

[0025] The two second trapezoidal extrusion wedge blocks 3 are connected by a fastening bolt 7 arranged along the second direction L2, and the fastening bolt 7 is used after the two steel bars are extruded and connected; a fastening bolt countersunk hole 31 is opened in the middle part of one of the second trapezoidal extrusion wedge blocks 3 and along the second direction L2, and a fixing threaded hole 33 is opened in the middle part of the other second trapezoidal extrusion wedge block 3 and along the second direction L2.

[0026] The inner surface of the locking piece 5 is provided with a plurality of annular engaging teeth 51 for locking the steel bar.

[0027] The inner cavities at both ends of the sleeve body 1 include a large guide hole 12 and a small guide hole 13, both of which are cylindrical, that is, the inner cavities at both ends of the sleeve body 1 are stepped cylindrical structures with a thick outer surface and a thin inner surface; accordingly, the top shaft 2 is also a stepped cylindrical structure with a thick outer surface and a thin inner surface, and it is inserted into the inner cavity of the sleeve body 1 from the outside to the inside. The top shaft 2 has a large guide cylindrical portion 21 and a small guide cylindrical portion 22, and the large guide cylindrical portion 21 and the small guide cylindrical portion 22 are respectively matched with the corresponding large guide hole 12 and the small guide hole 13; at this time, the inner diameter of the compression spring 8 is equal to the diameter of the large guide hole 12.

[0028] In the initial state before the steel bars are connected, the outer end of the large guide cylindrical portion 21 of the top shaft 2 protrudes from the outer end of the corresponding large guide hole 12 to facilitate the installation of the compression spring 8 and the locking plate 5.

[0029] The use principle of the present invention:

[0030] When the present invention is used to connect the fixed end steel bar 9 and the movable end steel bar 10, 1) the present invention is first assembled into Figure 1In the initial state shown, the inner end of the compression spring 8 is sleeved on the outer end of the large guide cylindrical portion 21 of the corresponding top shaft 2, and the multi-piece locking plate 5 is sleeved on the outside of the corresponding compression spring 8. The two tapered sleeves 4 are respectively connected to the two ends of the sleeve body 1 by threads. The compression spring 8 is in a compressed state through the interaction between the self-locking inner conical surface 42 of the tapered sleeve 4 and the self-locking outer conical surface 52 of the corresponding locking plate 5; 2) the outer end of the fixed-end steel bar 9 is inserted into a tapered sleeve 4 until it contacts the large guide cylindrical portion 21 of the corresponding top shaft 2, and then the locking plate 5 preliminarily clamps the fixed-end steel bar 9 under the action of the compression spring 8; 3) the outer end of the movable-end steel bar 10 is inserted into another tapered sleeve 4 until it contacts the large guide cylindrical portion 21 of the corresponding top shaft 2, and similarly in the same The locking piece 5 is initially clamped to the movable end steel bar 10 under the action of the compression spring 8; 4) using the extrusion tool, the two second trapezoidal extrusion wedges 3 are relatively slid in the guide groove 14 of the sleeve body 1, and the first extrusion slope 61 of the first trapezoidal extrusion wedge 6 is squeezed by the second extrusion slope 32 of the second trapezoidal extrusion wedge 3, so as to convert the radial force into the axial force, and push the two top shafts 2 toward the fixed end steel bar 9 and the movable end steel bar 10 respectively, and as the extrusion force increases, the self-locking outer conical surface 52 of the locking piece 5 and the self-locking inner conical surface 42 of the corresponding cone sleeve 4 interact with each other, so as to finally realize the clamping and fixing connection between the fixed end steel bar 9 and the movable end steel bar 10; 5) after being extruded into place, the two second trapezoidal extrusion wedges 3 are fixed and prevented from loosening by the fastening bolts 7.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of steel bar connecting sleeve, characterized in that: The invention comprises a sleeve body (1) having an axially hollow structure, wherein two guide grooves (14) are symmetrically arranged in the middle part of the sleeve body (1) and along the second direction L2, both of which are connected to the inner cavity of the sleeve body (1); two pairs of trapezoidal extrusion wedges are arranged in a cross shape in the inner cavity of the middle part of the sleeve body (1) and the guide grooves (14), wherein the two first trapezoidal extrusion wedges (6) are arranged relative to each other and slide along the first direction L1, and the two second trapezoidal extrusion wedges (3) are arranged relative to each other along the second direction L2. The sleeve body (1) is provided with a plurality of second trapezoidal extrusion wedges (3) and a plurality of second trapezoidal extrusion wedges (3). The second extrusion inclined surfaces (32) of the two second trapezoidal extrusion wedges (3) are respectively in contact with the first extrusion inclined surfaces (61) of the two first trapezoidal extrusion wedges (6); the first direction L1 is the axis of the sleeve body (1), and the second direction is a radial direction of the sleeve body (1); two top shafts (2) are symmetrically arranged on the lower bottom surfaces of the two first trapezoidal extrusion wedges (6) along the first direction L1; one end of the top shaft (2) is in contact with the lower bottom surface of the corresponding first trapezoidal extrusion wedge (6); The other end of the top shaft (2) is movably inserted into the inner cavity of one end of the sleeve body (1); two cone sleeves (4) are symmetrically arranged on the outside of the two ends of the sleeve body (1) through threads; the outer end of the inner cavity of the cone sleeve (4) is provided with a self-locking inner cone surface (42); a compression spring (8) and a locking plate (5) are arranged in the inner cavity of the cone sleeve (4) and along the first direction L1, and the locking plate (5) is a multi-plate structure, and the outer surface of the locking plate (5) is adapted to the self-locking inner cone surface (42) of the corresponding cone sleeve (4). The sleeve body (1) has a self-locking outer conical surface (52); the inner diameter of the compression spring (8) is equal to the diameter of the inner cavity outer port at one end of the sleeve body (1); the inner diameter of the compression spring (8) is slightly larger than the outer diameter of the steel bar to be connected inserted therein; the inner diameter of the locking piece (5) is equal to the outer diameter of the compression spring (8); in the initial state before the steel bar is connected, the locking piece (5) is sleeved on the outer end of the compression spring (8), and the compression spring (8) is in a compressed state through the interaction between the self-locking inner conical surface (42) and the self-locking outer conical surface (52).

2. A new type of steel bar connection sleeve according to claim 1, characterized in that: The sleeve body (1) is cylindrical in shape, and both ends of the sleeve body (1) are provided with external threads (11), and the inner end of the inner cavity of the cone sleeve (4) is provided with internal threads (41) that match the external threads (11).

3. A new type of steel bar connection sleeve according to claim 1, characterized in that: A cylindrical groove (62) is provided in the middle portion of the first trapezoidal extrusion wedge (6) and along the first direction L1, and one end of the top shaft (2) is inserted into the corresponding cylindrical groove (62).

4. A new type of steel bar connection sleeve according to claim 1, characterized in that: The two second trapezoidal extrusion wedges (3) are connected by a fastening bolt (7) arranged along the second direction L2; a fastening bolt countersunk hole (31) is provided in the middle part of one of the second trapezoidal extrusion wedges (3) and along the second direction L2, and a fixing threaded hole (33) is provided in the middle part of the other second trapezoidal extrusion wedge (3) and along the second direction L2.

5. A new type of steel bar connection sleeve according to claim 1, characterized in that: The inner surface of the locking plate (5) is provided with a plurality of annular engaging teeth (51).

6. A new type of steel bar connection sleeve according to claim 1, characterized in that: The inner cavities at both ends of the sleeve body (1) include a large guide hole (12) and a small guide hole (13) both of which are cylindrical; the top shaft (2) has a large guide cylindrical portion (21) and a small guide cylindrical portion (22), and the large guide cylindrical portion (21) and the small guide cylindrical portion (22) are respectively matched with the corresponding large guide hole (12) and the small guide hole (13); the inner diameter of the compression spring (8) is equal to the diameter of the large guide hole (12).

7. A new type of steel bar connection sleeve according to claim 6, characterized in that: In the initial state before the steel bars are connected, the outer end of the large guide cylindrical portion (21) of the top shaft (2) protrudes from the outer end of the corresponding large guide hole (12).

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