Mechanical connecting piece for building

Abstract

The utility model provides a mechanical connecting piece for a building, which comprises an inserting column, one end of the inserting column is a connecting section, the other end of the inserting column is provided with a variable-diameter inserting head, a middle section is arranged between the connecting section and the variable-diameter inserting head, and the middle section is connected with a necking part of the variable-diameter inserting head to form an annular avoiding groove which is concave inwards in the axial direction; a variable-diameter retaining surface is formed at the position, away from a sleeve opening by a preset depth, of the inserting sleeve; the wedge-shaped clamping ring is provided with a plurality of arc-shaped clamping pieces which are annularly arranged and can slide along the variable-diameter retaining blocking face so as to be gathered and scattered. When the variable-diameter connecting plug is inserted into the inserting sleeve, the wedge-shaped clamping ring can partially enter the annular receding groove and is clamped between the variable-diameter retaining blocking face and the outer wall of the variable-diameter connecting plug. The wedge-shaped clamping ring is connected between the variable-diameter retaining blocking face and the outer wall of the variable-diameter connecting plug in a clamped mode, under the limiting effect of the annular receding groove, the wedge-shaped clamping ring and the variable-diameter retaining blocking face can keep point contact during tensile strength and can be transited to face contact when the borne drawing force is increased, and the tensile strength of pile splicing is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated component connection, in particular to a mechanical connector for construction. Background Art

[0002] The existing mechanical connectors are often used to achieve the docking of two precast piles. In order to ensure the connection strength between the precast piles, a plurality of mechanical connectors are usually arranged around the edge of the precast pile ends, and the precast piles are docked through a plurality of mechanical connectors. An existing disclosed mechanical joint includes a small nut and a large nut, the small nut is fixedly installed with a plug rod, the threaded end of the plug rod is threadedly fixed with the small nut, the clamping step has a horizontal clamping surface, and an intermediate nut, a buckle tube, and a spring are sequentially installed in the large nut from top to bottom. A plurality of clamping platforms are arranged at one end of the buckle tube, and the plug-in portion of the plug rod is provided with a limiting groove for accommodating and forming a limiting fit with the clamping platform. The limiting groove is a rectangular groove, and the limiting groove has a radial limiting surface and an axial stopping surface for cooperating with the clamping platform. The radial limiting surface and the axial stopping surface are both vertical surfaces. Correspondingly, the clamping platform is rectangular, and when the plug-in portion of the plug rod is inserted into the large nut, the clamping platform is clamped and matched with the limiting groove. Although the mechanical joint of the above scheme can realize the mechanical connection between precast piles, it still has some shortcomings. The clamping base and the axial anti-slip surface are in horizontal contact. Only when the insertion rod is inserted into the specified position in the buckle tube can the clamping base and the anti-slip surface form a clamping fit. However, due to manufacturing errors in the production of precast piles, it is inevitable that the pile end face is tilted, resulting in an axial gap between the clamping base and the axial anti-slip surface of a certain number of mechanical joints, and a clamping fixation cannot be formed, and the reliability of the connection between the two precast piles cannot be guaranteed. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a mechanical connector for construction which can ensure reliable connection between prefabricated piles.

[0004] To achieve the above-mentioned purpose, the utility model provides a mechanical connector for construction, including: a plug-in column, one end of which is a connecting section, and the other end of which has a reducing plug-in joint, an intermediate section is provided between the connecting section and the reducing plug-in joint, and the intermediate section is connected to the neck portion of the reducing plug-in joint to form an annular avoidance groove that is axially recessed inward; a plug-in sleeve, which forms a reducing stop surface at a predetermined depth from the barrel mouth; a wedge-shaped clamping ring, which has a plurality of arc-shaped card clips arranged in an annular shape and can slide along the reducing stop surface to gather and disperse; when the reducing plug-in joint is inserted into the plug-in sleeve, the wedge-shaped clamping ring can partially enter the annular avoidance groove and be clamped between the reducing stop surface and the outer wall of the reducing plug-in joint.

[0005] Preferably, a radial limiting surface is provided on the inner wall of the plug-in sleeve on the side of the reducing stop surface away from the barrel mouth, and the reducing stop surface includes a first abutment surface and a second abutment surface radially away from the center axis of the plug-in sleeve, and the second abutment surface connects the first abutment surface and the radial limiting surface.

[0006] Preferably, the first abutting surface, the second abutting surface and the radial limiting surface have different inclination angles relative to the central axis of the plug-in sleeve.

[0007] Preferably, a radial width of the first abutting surface is smaller than or equal to a radial width of the second abutting surface, and an axial height of the first abutting surface is smaller than an axial height of the second abutting surface.

[0008] Preferably, the outer wall surface of the arc-shaped card is in point contact, line contact or surface contact with the first abutting surface or the second abutting surface.

[0009] Preferably, an outer wall of the notch of the annular avoidance groove is provided with an avoidance surface, and the inner diameter of the avoidance surface gradually increases in the direction from the connecting section to the reducer plug joint.

[0010] Preferably, the outer side surface and the inner side surface of the annular avoidance groove are both arc surfaces, and a guide surface is provided on the inner wall of the arc card near one end of the connecting section, and the guide surface is an arc surface adapted to the inner side surface.

[0011] Preferably, the plug-in sleeve is provided with a cylindrical accommodating wall for accommodating the middle section on the side of the reducing stop surface close to the barrel mouth, and the hardness of the connecting part between the cylindrical accommodating wall and the reducing stop surface is less than or equal to the hardness of the outer wall of the wedge-shaped retaining ring.

[0012] Preferably, the inner conical surface of the wedge-shaped retaining ring is provided with retaining teeth and / or the outer wall surface of the reducer plug-in connector is provided with an annular step; and / or, it also includes an elastic member, which is placed in the plug-in sleeve and pushes the wedge-shaped retaining ring toward the reducer stop surface.

[0013] Preferably, the plug-in sleeve comprises a sleeve body and a stop sleeve, the stop sleeve is installed in the sleeve body, and the variable diameter stop surface is arranged on the stop sleeve.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The middle section of the plug column is connected to the neck portion of the reducer plug connector to form an axially inwardly recessed annular avoidance groove, and the plug sleeve forms a reducer stop surface at a predetermined depth from the barrel mouth. The wedge-shaped snap ring has a plurality of arc-shaped cards arranged in an annular shape and capable of sliding along the reducer stop surface to gather and disperse. When the reducer plug connector is inserted into the plug sleeve, the wedge-shaped snap ring can partially enter the annular avoidance groove and be clamped between the reducer stop surface and the outer wall of the reducer plug connector. The wedge-shaped snap ring is clamped between the reducer stop surface and the outer wall of the reducer plug connector, and under the limiting action of the annular avoidance groove, the wedge-shaped snap ring and the reducer stop surface can maintain point contact when resisting tension, and can transition to surface contact when the pulling force on the mechanical connector increases. When the end face of the pile connection is uneven, there are different tensile states from point contact to surface contact between the wedge-shaped clamping rings and the reducer stop surfaces of multiple mechanical connectors. The number of pull-out-resistant mechanical connectors is greater, which increases the tensile strength of the pile connection and thereby ensures the reliability of the connection between the prefabricated piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the mechanical connector for construction after docking according to an embodiment of the utility model;

[0017] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at C;

[0018] Figure 3 This is a schematic diagram of the structure of the stop sleeve in an embodiment of the utility model;

[0019] Figure 4 It is a three-dimensional structural schematic diagram of the plug-in column of an embodiment of the utility model;

[0020] Figure 5 A cross-sectional view of a plug-in post according to an embodiment of the utility model;

[0021] Figure 6 It is a three-dimensional structural schematic diagram of a wedge-shaped clamping ring according to an embodiment of the utility model;

[0022] Figure 7 A cross-sectional view of a wedge-shaped snap ring according to an embodiment of the utility model;

[0023] Figure 8 This is a schematic diagram of the structure of the support pad of an embodiment of the utility model;

[0024] Fig. 9 It is a structural schematic diagram of another plug-in sleeve of an embodiment of the utility model;

[0025] Fig.10 It is a schematic structural diagram of the wedge-shaped clamping ring and the plug-in column after docking at different gaps between the end faces of two prefabricated piles of the utility model.

[0026] In the accompanying drawings: plug-in column 1; reducer plug-in connector 11; annular step 111; connecting section 12; middle section 13; annular avoidance groove 14; limiting portion 16; avoidance surface 141; outer side surface 142; inner side surface 143; plug-in sleeve 2; sleeve body 2a; stop sleeve 2b; barrel mouth a; reducer stop surface 21; first abutment surface 211; second abutment surface 212; radial limiting surface 22; cylindrical accommodating wall 23; external thread 24; rib hole 25; stop protrusion 26; wedge-shaped snap ring 3; arc-shaped card 31; guide surface 311; outer cone surface 312; card tooth 313; bottom surface 314; elastic member 4; support pad 41; cylindrical body 411; annular boss 412; support surface 4121; spring 42. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] In this article, the terms "upper, lower, inside, outside" and the like are established based on the positional relationships shown in the drawings. The corresponding positional relationships may also change depending on the drawings, and therefore cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" and the like are merely used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0029] like Figure 1-10The utility model provides a mechanical connector for construction, which is used to connect two adjacent prefabricated components, such as two prefabricated piles. The mechanical connector for construction includes a plug-in column 1, a plug-in sleeve 2, a wedge-shaped clamping ring 3 and an elastic member 4. One end of the plug-in column 1 is a connecting section 12, and the other end is provided with a reducing plug-in joint 11. An intermediate section 13 is provided between the connecting section 12 and the reducing plug-in joint 11. The intermediate section 13 is connected to the neck portion of the reducing plug-in joint 11 to form an axially inwardly recessed annular avoidance groove 14. ; The plug-in sleeve 2 forms a reducing stop surface 21 at a predetermined depth from the barrel mouth a; the wedge-shaped snap ring 3 has a plurality of arc-shaped cards 31 arranged in an annular shape and capable of sliding along the reducing stop surface 21 to gather and disperse; the elastic member 4 is placed in the plug-in sleeve 2 and pushes the wedge-shaped snap ring 3 against the reducing stop surface 21. When the reducing plug joint 11 is inserted into the plug-in sleeve 2 from the barrel mouth a, the wedge-shaped snap ring 3 can partially enter the annular avoidance groove 14 and be clamped between the reducing stop surface 21 and the outer wall of the reducing plug joint 11. The wedge-shaped snap ring 3 is clamped between the reducing stop surface 21 and the outer wall of the reducing plug joint 11, and under the limiting action of the annular avoidance groove 14, the wedge-shaped snap ring 3 and the reducing stop surface 21 can maintain point contact when resisting tension, and can transition to surface contact when the pulling force on the mechanical connector increases. When the end face of the pile connection is uneven, there are different tensile states from point contact to surface contact between the wedge-shaped clamping ring 3 and the variable diameter stop surface 21 of multiple mechanical connectors. The number of pull-out-resistant mechanical connectors is greater, which increases the tensile strength of the pile connection and thereby ensures the reliability of the connection between the prefabricated piles.

[0030] like Figure 1 As shown, the plug-in sleeve 2 is a split structure, and the plug-in sleeve 2 includes a sleeve body 2a and a stopper sleeve 2b. The stopper sleeve 2b is installed in the sleeve body 2a, and the diameter-changing stopper surface 21 is provided on the stopper sleeve 2b. The stopper sleeve 2b is installed at one axial end of the sleeve body 2a, and a rib-piercing hole 25 is provided at the other axial end of the sleeve body 2a. The rib-piercing hole 25 can be a head clamping table, and the head clamping table can limit the head of the steel bar inside it to realize the connection between the sleeve body and the steel bar, or the rib-piercing hole can be a threaded hole, which can be connected with threaded steel, or the rib-piercing hole can be a tapered hole, which can be connected with the anchor head of the steel strand. During assembly, the elastic member 4 and the wedge-shaped clamping ring 3 can be installed into the sleeve body 2a from one end of the sleeve body 2a, and then the stopper sleeve 2b can be installed into the sleeve body 2a. Specifically, the stopper sleeve 2b is preferably threadedly connected to the sleeve body 2a, the outer wall of the stopper sleeve 2b is provided with an external thread, and the inner wall of the sleeve body 2a is provided with an internal thread that matches the external thread. Of course, the stopper sleeve 2b and the sleeve body 2a can also be assembled and fixed as a whole by welding, pinning, or bonding. In other embodiments, such as Fig. 9As shown, the plug sleeve 2 can be an integrated structure, that is, the stop sleeve 2b and the sleeve body 2a are an integrated structure, which can be manufactured by die stamping, deep drawing and other forming methods. The plug sleeve 2 is provided with a rib hole 25 at one end away from the barrel mouth a. The rib hole 25 is a threaded hole, which can be directly connected to the threaded steel bar, or the rib hole 25 is a threaded hole, and the rib hole 25 is threaded with a connecting nut, and a head clamp is connected inside the connecting nut. The head clamp can limit the head of the steel bar inside it to achieve the connection between the connecting nut and the steel bar. The wedge-shaped clamp ring 3 and the elastic member 4 can be installed in the plug sleeve 2 through the rib hole 25.

[0031] like Figure 2 , 3 As shown in Figures 9 and 10, preferably, a radial limiting surface 22 is provided on the inner wall of the plug-in sleeve 2 on the side of the variable diameter stop surface 21 away from the barrel mouth a. In the direction from the radial limiting surface 22 to the variable diameter stop surface 21, the inner diameter of the variable diameter stop surface 21 gradually increases. The variable diameter stop surface 21 includes a first abutting surface 211 and a second abutting surface 212 radially away from the central axis of the plug-in sleeve 2. The second abutting surface 212 connects the first abutting surface 211 and the radial limiting surface 22. The first abutting surface 211, the second abutting surface 212, and the radial limiting surface 22 have different inclination angles Q relative to the central axis o of the plug-in sleeve 2. The radial limiting surface 22 is provided to block the wedge-shaped snap ring 3 when it slides toward the end of the variable diameter stop surface 21, thereby preventing the wedge-shaped snap ring 3 from sliding out of the variable diameter stop surface 21. The first abutting surface 211 and the second abutting surface 212 with different inclination angles are provided, which is conducive to ensuring that the wedge-shaped clamping ring 3 remains clamped to the reducer plug joint 3 and the reducer stop surface 21 when the different gaps H between the end faces of the two prefabricated piles and the plug-in column 1 is subjected to a pulling force, and the wedge-shaped clamping ring 3 and the reducer plug joint 11 form a stable clamping connection, and the two are not easy to be separated, thereby improving the connection reliability of the mechanical connector. In other embodiments, the reducer stop surface 21 can only have the first abutting surface 211, and the first abutting surface 211 is connected to the radial limiting surface 22, and the inclination angle of the entire reducer stop surface 21 relative to the central axis of the plug-in sleeve 1 remains unchanged, or the reducer stop surface 21 can also include three or more abutting surfaces with different inclination angles, and the radial limiting surface 22 is connected to the abutting surface closest to it, and the specific number of abutting surfaces can be selected according to actual needs.

[0032] like Figure 3As shown, preferably, the radial width W of the first abutting surface 211 is less than or equal to the radial width of the second abutting surface 212, and the axial height d of the first abutting surface 211 is less than the axial height of the second abutting surface 212. Preferably, the outer wall surface of the arc-shaped card 31 is in point contact, line contact, or surface contact with the first abutting surface 211 or the second abutting surface 212. The outer wall surface of the arc-shaped card 31 may only contact with the first abutting surface 211 or the second abutting surface 212, or may contact with both the first abutting surface 211 and the second abutting surface 212. Figure 1 , 2 As shown in FIG. 10 , in the plug-in state with different gaps H between the end faces of the two connecting piles, when the plug-in posts 1 of multiple mechanical connectors are inserted into the plug-in sleeve 2 at different depths, the wedge-shaped clamping ring 3 and the reducer plug-in joint 11 maintain stable clamping.

[0033] like Figure 2 As shown, the arc card 31 is in point contact or line contact with the variable diameter stop surface 21, and the arc card 31 partially enters the annular avoidance groove 14. In this plug-in state, when the plug-in column 1 is subjected to a pulling force, the tilting of the arc card 31 can destroy the point contact or line contact, and the arc card 31 and the variable diameter stop surface 21 become surface contact, so that the connection between the wedge-shaped clamping ring 31 and the plug-in column 1 still has sufficient tensile strength.

[0034] like Figure 1 , 5 As shown, the middle section 13 of the plug post 1 is provided with a stopper 16 on the shaft section close to the connecting section 12, the maximum outer diameter of the stopper 16 is greater than the diameter of the middle section 13, the outer contour of the stopper 16 can be a regular polygon structure that matches with the screwing tool, or the outer wall of the stopper 16 is provided with a bayonet that matches with the screwing tool. Figure 1-2 As shown, when the reducer plug connector 11 is inserted into the plug sleeve 2, the limiting portion 16 of the plug column 1 abuts against the end face of the stop sleeve 2b away from the reducer limiting surface 22, and there is no axial gap between the limiting portion 16 and the end face of the stop surface 2b. This is the most ideal plug-in state for the mechanical connector. The reducer plug connector 11 is inserted into the plug sleeve 1 to the maximum depth, and the arc-shaped card 31 partially enters the annular avoidance groove 14. The annular avoidance groove 14 and the reducer stop surface 21 jointly limit the arc-shaped card 31, so that a reliable clamping connection is formed between the wedge-shaped clamp ring 3, the stop sleeve 2b, and the plug column 1. Combined with Figure 3 As shown, preferably, in order to limit the depth of the stop sleeve 2b screwed into the sleeve body 2a, one end of the stop sleeve 2b away from the radial limiting surface 22 extends radially outward to form a stop protrusion 26. When the stop sleeve 2b is completely screwed into the sleeve body 2a, the stop protrusion 26 presses the end of the sleeve body 1.

[0035] like Figure 2 , 5As shown, preferably, the outer wall of the notch of the annular avoidance groove 14 is provided with an avoidance surface 141, and the inner diameter of the avoidance surface 141 gradually increases in the direction from the connecting section 12 to the reducer plug joint 11. The avoidance surface 141 is provided to enable the wedge-shaped snap ring 3 to tilt in the annular avoidance groove 14, so that the wedge-shaped snap ring 3 can smoothly enter the annular avoidance groove 14. The outer side surface 142 and the inner side surface 143 of the annular avoidance groove 14 are both cambered surfaces, and combined with Figure 7 As shown, a guide surface 311 is provided at one end of the inner wall of the arc-shaped card 31 close to the connecting section 12 , and the guide surface 311 is an arc-shaped surface matched with the inner side surface 143 .

[0036] like Figure 3 , 9 As shown, preferably, the plug-in sleeve 2 is provided with a cylindrical accommodating wall 23 for accommodating the middle section 13 on the side of the variable diameter stop surface 21 close to the barrel mouth a, and the hardness of the connecting part of the cylindrical accommodating wall 23 and the variable diameter stop surface 21 is less than or equal to the hardness of the outer wall of the wedge-shaped clamping ring 3. Preferably, combined with Figure 1 , 5 As shown, the shape of the cylindrical containing wall 23 is adapted to the shape of the middle section 13, which is beneficial to reducing the radial gap between the plug-in column 1 and the cylindrical containing wall 23 and the degree of inclination between the two. The shape of the cylindrical containing wall 23 can be a straight cylinder shape or a conical cylinder shape or a combination of a straight cylinder and a conical cylinder, etc.

[0037] like Figure 7 , 8 As shown, preferably, the inner conical surface of the wedge-shaped snap ring 3 is provided with a latching tooth 313 and / or the outer wall surface of the reducer plug joint 11 is provided with an annular step 111. In this embodiment, the inner conical surface of the wedge-shaped snap ring 3 is provided with a latching tooth 313, and the outer wall surface of the reducer plug joint 11 is provided with an annular step 111 engaged with the latching tooth 313. When the inner conical surface of the wedge-shaped snap ring 3 contacts the outer wall of the reducer plug joint 11, the latching tooth 313 and the annular step 111 are engaged, which is beneficial to improve the friction resistance between the wedge-shaped snap ring 3 and the reducer plug joint 11 and improve the axial tensile strength. In this embodiment, either the latching tooth 313 or the annular step 111 is selected.

[0038] like Figure 4 , 5As shown, the reducer plug connector 11 includes a first reducer portion 11a and a second reducer portion 11b for connecting the middle section 13 with the first reducer portion 11a. A small section of equal diameter portion 11c may be provided between the first reducer portion 11a and the second reducer portion 11b. The outer diameter of the first reducer portion 11a gradually decreases along the direction from the connecting section 12 to the middle section 13, and the outer diameter of the second reducer portion 11b gradually increases along the direction from the connecting section 12 to the middle section 13, forming a truncated cone-shaped clamping portion with a small outer diameter at the upper end and a large outer diameter at the lower end. The wedge-shaped clamping ring 3 is sleeved on the truncated cone-shaped clamping portion on the reducer plug connector 11, thereby forming a reverse clamping of the reducer plug connector 11 to prevent the plug-in column 1 from being pulled out. An annular step 111 is provided on the outer wall of the second diameter reducing portion 11b. A plurality of annular steps 111 may be arranged axially at intervals along the outer wall of the second diameter reducing portion 11b. Accordingly, a plurality of retaining teeth 313 may be provided on the inner conical surface of the wedge-shaped retaining ring 3 along the axial direction.

[0039] like Figure 1-2 As shown in Figures 8 and 9, preferably, the elastic member 4 includes a spring 42 and a support pad 41, wherein the spring 42 is used to generate an upward elastic force so that the wedge-shaped retaining ring 3 always has a tendency to return to the variable diameter stop surface 21 or is pressed against the variable diameter stop surface 21. By providing the support pad 41, the wedge-shaped retaining ring 3 can be stably supported and the elastic force of the spring 42 can be evenly transmitted to the wedge-shaped retaining ring 3. The support pad 41 includes a cylindrical body 411 and an annular boss 412 radially protruding relative to the cylindrical body 41. The spring 42 is sleeved on the outside of the cylindrical body 41. The annular boss 412 has a support surface 4121 for supporting the wedge-shaped retaining ring 3. The support surface 4121 is inclined relative to the central axis of the support pad 41, as shown in Figures 8 and 9. Figure 2 As shown, in this plugged state, the arc card 31 partially enters the annular avoidance groove 14, and the bottom surface of the arc card 31 is inclined. At this time, the contact area between the support surface 4121 and the bottom surface 314 of the arc card 31 is the largest. In order to make the connection between the spring 42 and the support pad 41 stable, the top of the spring can be wound around the support pad 41, or the top of the spring 42 and the support pad 41 are connected and fixed as a whole by welding or bonding, etc., wherein the spring is specifically a cylindrical spring or a tower spring or a spring with an irregular longitudinal section shape or a spring with an irregular cross-sectional shape, etc., or it can be a combination of two or more different types of springs, or, in other embodiments, the elastic member 4 can be a cylindrical rubber pad, or the elastic member 4 only includes the spring 42, and the support pad 41 is not provided.

[0040] When the mechanical connector for construction is in use, the plug-in column 1 is arranged on the first prefabricated component, and the outer wall of the connecting section 12 is provided with an external thread. The plug-in column 1 can be detachably connected to the nut sleeve (not shown) of the first prefabricated component through the external thread on the connecting section 12. The spring 42, the support pad 41, the wedge-shaped clamping ring 3 and the stop sleeve 2b are arranged on the sleeve body 2a of the second prefabricated component. The first prefabricated component and the second prefabricated component are firmly connected together through the clamping fit between the second reducing portion 11b of the plug-in column 1, the wedge-shaped clamping ring 3 and the stop sleeve 2b.

[0041] The above is a detailed introduction to the mechanical connector for construction provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A mechanical connector for construction, characterized in that: include: A plug-in column, one end of which is a connecting section, and the other end of which is provided with a reducing plug-in joint, an intermediate section is provided between the connecting section and the reducing plug-in joint, and the intermediate section is connected with the neck portion of the reducing plug-in joint to form an annular avoidance groove that is axially recessed inwards; The plug-in sleeve has a diameter-changing stop surface formed at a predetermined depth from the sleeve mouth; A wedge-shaped snap ring, having a plurality of arc-shaped snapping cards arranged in an annular shape and capable of sliding along the variable diameter stop surface to gather and disperse; When the reducer plug connector is inserted into the plug sleeve, the wedge-shaped clamping ring can partially enter the annular avoidance groove and be clamped between the reducer stop surface and the outer wall of the reducer plug connector.

2. The mechanical connector for construction according to claim 1, characterized in that: The inner wall of the plug-in sleeve is provided with a radial limiting surface on the side of the reducing stop surface away from the barrel mouth, and the reducing stop surface includes a first abutting surface and a second abutting surface radially away from the central axis of the plug-in sleeve, and the second abutting surface connects the first abutting surface and the radial limiting surface.

3. The mechanical connector for construction as claimed in claim 2, characterized in that: The first abutting surface, the second abutting surface and the radial limiting surface have different inclination angles relative to the central axis of the plug-in sleeve.

4. The mechanical connector for construction as claimed in claim 2, characterized in that: The radial width of the first abutting surface is smaller than or equal to the radial width of the second abutting surface, and the axial height of the first abutting surface is smaller than the axial height of the second abutting surface.

5. The mechanical connector for construction as claimed in claim 2, characterized in that: The outer wall surface of the arc-shaped card is in point contact, line contact or surface contact with the first abutting surface or the second abutting surface.

6. The mechanical connector for construction according to claim 1, characterized in that: An escape surface is provided on the outer wall of the notch of the annular escape groove, and the inner diameter of the escape surface gradually increases in the direction from the connecting section to the reducer plug joint.

7. The mechanical connector for construction according to claim 1, characterized in that: The outer side surface and the inner side surface of the annular avoidance groove are both arc surfaces, and a guide surface is provided on an end of the inner wall of the arc card close to the connecting section, and the guide surface is an arc surface adapted to the inner side surface.

8. The mechanical connector for construction as claimed in claim 1, characterized in that: The plug-in sleeve is provided with a cylindrical accommodating wall for accommodating the middle section on the side of the variable diameter stop surface close to the barrel mouth, and the hardness of the connecting part between the cylindrical accommodating wall and the variable diameter stop surface is less than or equal to the hardness of the outer wall surface of the wedge-shaped clamping ring.

9. The mechanical connector for construction as claimed in claim 1, characterized in that: The inner conical surface of the wedge-shaped snap ring is provided with snap teeth and / or the outer wall surface of the reducer plug connector is provided with an annular step; And / or, it also includes an elastic member, which is placed in the plug-in sleeve and pushes the wedge-shaped clamping ring toward the variable diameter stop surface.

10. The mechanical connector for construction according to any one of claims 1 to 9, characterized in that: The plug-in sleeve comprises a sleeve body and a stop sleeve, wherein the stop sleeve is installed in the sleeve body, and the diameter-changing stop surface is arranged on the stop sleeve.

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