Centering expansion bolt

Abstract

The invention relates to the technical field of expansion bolts, in particular to a centering expansion bolt which comprises an outer shell and a threaded rod, external threads are arranged on the outer wall of the upper end of the outer shell, the upper end of the threaded rod is in threaded connection to the inner wall of the outer shell, a rotating block is fixedly connected to the upper end of the threaded rod, and a connecting protruding block is fixedly connected to the bottom end of the threaded rod. The connecting protruding block extends to the lower side of the outer shell, and the bottom end of the outer shell is fixedly connected with an expansion block. According to the centering expansion bolt, through the arrangement of the automatic alignment mechanism and the auxiliary mechanism, when the threaded rod rotates forwards, the sliding frame can drive the sliding block and the movable balls to move towards the side away from the threaded rod, all the movable balls can abut against the interior of a hole, and when the threaded rod cannot continue to move downwards, the sliding block and the movable balls can move forwards. And if the whole outer shell deviates, the movable balls in all directions can correct the outer shell, so that the bolt can be quickly centered, and the bolt can be inserted more smoothly.

Description

Technical Field

[0001] This invention relates to the field of expansion bolt technology, specifically a centering expansion bolt. Background Technology

[0002] Expansion bolts are connectors that are installed on walls later. Before installation, holes are drilled in the wall to form wall holes, and then the non-nut washer end of the expansion bolt is inserted into the wall hole. This installation method is mainly divided into manual installation and automatic installation by feeding equipment. With the development of industrial automation, expansion bolts are usually installed using automatic feeders. Specifically, the feeder's outlet is aligned with the wall hole, and then the feeder pushes the expansion bolt into the wall hole. During this process, because the outer diameters of the front and rear ends of the expansion bolt are different, with the front outer diameter being smaller, the expansion bolt will be in an inclined state when it is pushed outward in the feeder's magazine.

[0003] In the existing technology, in order to solve the problem of expansion bolt tilting, a special positioning mechanism is required to position the expansion bolt and the hole. The positioning mechanism needs to spend time aligning with the hole, which wastes manpower and time and is prone to errors. In addition, some holes are located in corners, and the positioning mechanism located on the outside of the hole cannot be placed, thus failing to position smoothly. Summary of the Invention

[0004] To address the above problems, the present invention provides a centering expansion bolt.

[0005] This invention adopts the following technical solution: a centering expansion bolt, comprising a housing and a threaded rod. The upper outer wall of the housing is provided with an external thread. The upper end of the threaded rod is threaded to the inner wall of the housing. A rotating block is fixedly connected to the upper end of the threaded rod, and a connecting protrusion is fixedly connected to the bottom end of the threaded rod. The connecting protrusion extends to the lower side of the housing. An expansion block is fixedly connected to the bottom end of the housing. The bolt also includes:

[0006] An automatic alignment mechanism is provided inside the housing to automatically align the outer casing with the hole.

[0007] And an auxiliary mechanism for enhancing the friction between the outer casing and the inner wall of the hole, the auxiliary mechanism being disposed within the automatic alignment mechanism.

[0008] As a further description of the above technical solution: the automatic alignment mechanism includes an insertion slot formed on the outer wall of the outer shell, a sliding frame is horizontally slidably arranged in the insertion slot, a compression rubber ring is fixedly connected to the lower side of the outer wall of the threaded rod, a sliding block is horizontally inserted at the upper end of the sliding frame, a movable ball is movably arranged at one end of the sliding block extending to the outside of the sliding frame, the movable ball is arranged away from the threaded rod, and an inclined sliding surface is formed at the bottom of one end of the sliding frame near the threaded rod, the compression rubber ring abuts against the inclined sliding surface.

[0009] As a further description of the above technical solution: the auxiliary mechanism comprises a pressing convex ring, the pressing convex ring is fixed to the outer wall of the bottom end of the threaded rod, the pressing convex ring is located on the upper side of the pressing rubber ring, a trapezoidal plug is inserted on the bottom end of the sliding block, the trapezoidal plug is movably arranged in the sliding frame, the bottom end of the trapezoidal plug abuts against a trigger rod, one end of the trigger rod close to the threaded rod extends to the outer side of the sliding frame, a vertical plane is formed in the upper end of the sliding frame, a second inclined sliding surface is arranged between the vertical plane and a first inclined sliding surface, and the second inclined sliding surface is formed in the sliding frame.

[0010] As a further description of the above technical solution: the expansion block is annular and is arranged at intervals.

[0011] As a further description of the above technical solution: when the pressing rubber ring moves downward, the pressing rubber ring can extrude the sliding frame outward.

[0012] As a further description of the above technical solution: the outer wall of the shell body is arranged at intervals with four sliding frames.

[0013] As a further description of the above technical solution: when the pressing rubber ring moves upward, the pressing rubber ring can extrude the second inclined sliding surface and the vertical plane, and the pressing rubber ring has elasticity.

[0014] As a further description of the above technical solution: the pressing convex ring can extrude the sliding block away from the threaded rod.

[0015] The present application improves the centering expansion bolt, compared with the prior art, has the following improvements and advantages:

[0016] Firstly, by arranging the automatic alignment mechanism and the auxiliary mechanism, when the threaded rod rotates forward, the sliding frame drives the sliding block and the movable ball to move away from the threaded rod, so that each movable ball abuts against the inner wall of the hole, when the threaded rod cannot continue to move downward, the rotation of the threaded rod is notified, if the shell body deviates as a whole, the movable balls in each direction can correct the shell body, so that the bolt can be quickly centered;

[0017] Secondly, after the shell body is inserted into the hole, the threaded rod rotates reversely, the movable ball no longer abuts against the inner wall of the hole, so that the sliding frame generates static friction on the hole to replace the rolling friction of the movable ball, thereby improving the expansion fixing effect and further enhancing the fixing effect of the bolt, wherein the pressing rubber ring has elasticity, the expansion degree of the expansion block is different in different hole diameters, the lifting degree of the abutting convex block and the pressing rubber ring is different, and the sliding frame can abut against the inner wall of the hole.

[0018] In summary, by setting the automatic alignment mechanism and the auxiliary mechanism, when the threaded rod rotates forward, the sliding frame will drive the sliding block and the movable ball to move away from the threaded rod, so that each movable ball is tightly pressed against the inside of the hole. When the threaded rod cannot continue to move downward, the rotation of the threaded rod is notified. If the entire shell body deviates, the movable balls in each direction will correct the shell body, so that the bolt can be quickly centered. After the entire shell body is inserted into the hole, the threaded rod rotates in the opposite direction, and the movable ball is no longer tightly pressed against the inner wall of the hole, so that the sliding frame produces static friction on the hole to replace the rolling friction of the movable ball, thereby improving the expansion fixing effect and further enhancing the fixing effect of the bolt. The extruded rubber ring has elasticity, and the degree of expansion of the expansion block is different in different hole diameters. The degree of upward movement of the abutment protrusion and the extruded rubber ring is different, and the sliding frame can be tightly pressed against the inner wall of the hole. The structure is simple, can play a centering role, and can make the insertion of the bolt more smooth. BRIEF DESCRIPTION OF DRAWINGS

[0019] The application will be further explained in conjunction with the drawings and examples:

[0020] Figure 1 The structure of the application is shown in the figure;

[0021] Figure 2 The structure of the threaded rod provided by the embodiment of the application is shown in the figure;

[0022] Figure 3 The perspective view of the shell body provided by the embodiment of the application is shown in the figure;

[0023] Figure 4 The structure of the shell body and the threaded rod provided by the embodiment of the application is shown in the figure;

[0024] Figure 5 The structure of the extruded protruding ring one and the extruded protruding ring two provided by the embodiment of the application is shown in the figure;

[0025] Figure 6 The structure of the extruded protruding ring one and the extruded protruding ring two provided by the embodiment of the application is shown in the figure; Figure 3 The enlarged view of A in the figure;

[0026] Figure 7 The enlarged view of B in the figure; Figure 5 The enlarged view of B in the figure.

[0027] In the figure: 1, shell body; 2, rotating block; 3, threaded rod; 4, automatic alignment mechanism; 41, sliding frame; 42, insertion slot; 43, extruded rubber ring; 44, sliding block; 45, movable ball; 46, inclined sliding surface one; 5, expansion block; 6, abutment protrusion; 7, external thread; 8, auxiliary mechanism; 81, extruded protruding ring; 82, trapezoidal insertion block; 83, trigger rod; 84, inclined sliding surface two; 85, vertical plane. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application will be further described below in conjunction with specific drawings. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0029] Please refer to Figure 1 - Figure 7 The embodiment of the present application provides a technical solution: a centering expansion bolt, comprising an outer shell 1 and a threaded rod 3, an outer thread 7 is arranged on the outer wall of the upper end of the outer shell 1, the threaded rod 3 is threadedly connected to the inner wall of the outer shell 1 at the upper end, a rotating block 2 is fixedly connected to the upper end of the threaded rod 3, a connecting protrusion 6 is fixedly connected to the bottom end of the threaded rod 3, the connecting protrusion 6 extends to the lower side of the outer shell 1, and an expansion block 5 is fixedly connected to the bottom end of the outer shell 1, further comprising:

[0030] an automatic alignment mechanism 4 capable of automatically aligning the outer shell 1 with a hole, the automatic alignment mechanism 4 being arranged in the outer shell 1;

[0031] and an auxiliary mechanism 8 for enhancing the friction between the outer shell 1 and the inner wall of the hole, the auxiliary mechanism 8 being arranged in the automatic alignment mechanism 4.

[0032] The expansion block 5 is annular and arranged at equal intervals with a plurality of expansion blocks 5, and the expansion block 5 has elasticity.

[0033] Specifically, through the arrangement of the automatic alignment mechanism 4 and the auxiliary mechanism 8, when the threaded rod 3 rotates forward, the sliding frame 41 drives the sliding block 44 and the movable ball 45 to move away from the threaded rod 3, so that each movable ball 45 is tightly abutted against the inside of the hole, and when the threaded rod 3 cannot continue to move downward, the rotation of the threaded rod 3 is informed, and if the outer shell 1 as a whole deviates, the movable balls 45 in each direction can correct the outer shell 1, so that the bolt can be quickly centered, and after the outer shell 1 as a whole is inserted into the hole, the threaded rod 3 reversely rotates, the movable ball 45 is no longer tightly abutted against the inner wall of the hole, so that the sliding frame 41 produces static friction on the hole to replace the rolling friction of the movable ball 45, thereby improving the expansion fixing effect and further enhancing the fixing effect of the bolt, wherein the extruded rubber ring 43 has elasticity, the expansion block 5 expands to different degrees in different hole diameters, the connecting protrusion 6 and the extruded rubber ring 43 move to different degrees, and the sliding frame 41 can be tightly abutted against the inner wall of the hole, the structure is simple, can play a centering role, and can make the insertion of the bolt more smooth.

[0034] In still another embodiment provided by the application, the automatic alignment mechanism 4 comprises a plug-in slot 42 formed on the outer wall of the outer shell 1, a sliding frame 41 horizontally slidingly arranged in the plug-in slot 42, an extruded rubber ring 43 fixedly connected to the lower side of the outer wall of the threaded rod 3, a sliding block 44 horizontally plug-in arranged in the inner upper end of the sliding frame 41, a movable ball 45 movably arranged at one end of the sliding block 44 extending to the outer side of the sliding frame 41, the movable ball 45 being arranged away from the threaded rod 3, and a slanted sliding surface one 46 formed on the bottom of one end of the sliding frame 41 close to the threaded rod 3, the extruded rubber ring 43 abutting against the slanted sliding surface one 46.

[0035] When the extruded rubber ring 43 moves downward, the extruded rubber ring 43 can extrude the sliding frame 41 outward.

[0036] The outer wall of the outer shell 1 is provided with four sliding frames 41 at equal intervals.

[0037] Specifically, through the arrangement of the automatic alignment mechanism 4 and the auxiliary mechanism 8, when the threaded rod 3 rotates in the forward direction, the sliding frame 41 can drive the sliding block 44 and the movable ball 45 to move away from the threaded rod 3, so that each movable ball 45 abuts against the inner hole, and when the threaded rod 3 cannot continue to move downward, the rotation of the threaded rod 3 is informed, and if the outer shell 1 deviates as a whole, the movable balls 45 in each direction can correct the outer shell 1, so that the bolt can be quickly centered.

[0038] In still another embodiment provided by the application, the auxiliary mechanism 8 comprises an extruded convex ring 81 fixedly connected to the outer wall of the bottom end of the threaded rod 3, the extruded convex ring 81 being arranged above the extruded rubber ring 43, a trapezoidal plug-in block 82 plug-in arranged on the bottom end of the sliding block 44, the trapezoidal plug-in block 82 being movably arranged in the sliding frame 41, a trigger rod 83 abutting against the bottom end of the trapezoidal plug-in block 82, the trigger rod 83 extending to the outer side of the sliding frame 41 close to the threaded rod 3, a vertical plane 85 formed on the upper end of the sliding frame 41, a slanted sliding surface two 84 arranged between the vertical plane 85 and the slanted sliding surface one 46, and the slanted sliding surface two 84 being formed on the sliding frame 41.

[0039] When the extruded rubber ring 43 moves upward, the extruded rubber ring 43 can extrude the slanted sliding surface two 84 and the vertical plane 85, and the extruded rubber ring 43 has elasticity.

[0040] The extruded convex ring 81 can extrude the sliding block 44 away from the threaded rod 3.

[0041] Specifically, when the outer shell 1 is inserted into the hole as a whole, the threaded rod 3 is reversely rotated, the movable ball 45 no longer abuts against the inner wall of the hole, the sliding frame 41 abuts against the hole to replace the rolling friction of the movable ball 45 with static friction, thereby improving the expansion fixing effect and further enhancing the fixing effect of the bolt, wherein the extruded rubber ring 43 is elastic, at different hole diameters, the expansion block 5 expands to different degrees, the engaging protrusion 6 and the extruded rubber ring 43 move to different degrees, and the sliding frame 41 can abut against the inner wall of the hole, the structure is simple, can play the role of centering, and can make the insertion of the bolt more smooth.

[0042] Working principle: when the bolt is used, the outer shell 1 is placed in the hole with the end close to the engaging protrusion 6, so that the sliding frame 41 is located in the hole, then the rotating block 2 is twisted, the rotating block 2 and the threaded rod 3 move downward, so that the extruded rubber ring 43 moves downward with the threaded rod 3, when the extruded rubber ring 43 moves downward, the extruded rubber ring 43 extrudes the inclined sliding surface 46 on the sliding frame 41, so that the sliding frame 41 moves away from the threaded rod 3, then the sliding frame 41 drives the sliding block 44 and the movable ball 45 to move away from the threaded rod 3, so that each movable ball 45 abuts against the inside of the hole, when the threaded rod 3 cannot continue to move downward, the rotation of the threaded rod 3 is informed, if the outer shell 1 deviates as a whole, the movable balls 45 in each direction can correct the outer shell 1, so that the bolt can be quickly centered, and when the movable ball 45 extends to the outside of the outer shell 1, when the movable ball 45 moves downward, the bolt and the inner wall of the hole only abut against the movable ball 45, so that the bolt can be inserted into the hole by rolling while centering, the friction can be reduced, and the bolt can move more smoothly;

[0043] When the outer shell 1 is inserted into the hole, the threaded rod 3 is reversed to move upward, and the expansion block 5 is expanded by the adapter block 6, so that the bolt is fixed in the hole, and the extrusion rubber ring 43 is moved upward by the threaded rod 3, and the extrusion rubber ring 43 is extruded on the inclined sliding surface 84 and the vertical plane 85 in sequence, and when it moves to the vertical plane 85, the sliding frame 41 is located outside the outer shell 1, the outer wall of the sliding frame 41 is tightly contacted with the inner wall of the hole, and at this time the extrusion rubber ring 43 extrudes the trigger rod 83 inward, the trapezoidal plug 82 is moved upward into the sliding block 44, and the movable ball 45 is extruded by the inner wall of the hole, so that the movable ball 45 and the sliding block 44 move inward, so that the movable ball 45 is no longer tightly contacted with the inner wall of the hole, so that the sliding frame 41 plays a static friction on the hole to replace the rolling friction of the movable ball 45, so as to improve the expansion fixing effect and further enhance the fixing effect of the bolt, wherein the extrusion rubber ring 43 has elasticity, and in different hole diameters, the expansion degree of the expansion block 5 is different, the upward movement degree of the adapter block 6 and the extrusion rubber ring 43 is different, and the sliding frame 41 can be tightly contacted with the inner wall of the hole, wherein the setting of the extrusion convex ring 81 can drop the trapezoidal plug 82 into the sliding frame 41 again when the bolt is reused.

[0044] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A centering expansion bolt, comprising a housing (1) and a threaded rod (3), wherein the outer wall of the upper end of the housing (1) is provided with an external thread (7), the upper end of the threaded rod (3) is threadedly connected to the inner wall of the housing (1), a rotating block (2) is fixedly connected to the upper end of the threaded rod (3), a connecting protrusion (6) is fixedly connected to the bottom end of the threaded rod (3), the connecting protrusion (6) extends to the lower side of the housing (1), and an expansion block (5) is fixedly connected to the bottom end of the housing (1), characterized in that, Also includes: An automatic alignment mechanism (4) is provided inside the outer shell (1) to automatically align the outer shell (1) with the hole. And an auxiliary mechanism (8) for enhancing the friction between the outer shell (1) and the inner wall of the hole, the auxiliary mechanism (8) being disposed within the automatic alignment mechanism (4).

2. The centering expansion bolt according to claim 1, characterized in that: The automatic alignment mechanism (4) includes an insertion slot (42) on the outer wall of the outer shell (1). A sliding frame (41) is horizontally slidably arranged in the insertion slot (42). A compression rubber ring (43) is fixedly connected to the lower side of the outer wall of the threaded rod (3). A sliding block (44) is horizontally inserted at the upper end of the sliding frame (41). A movable ball (45) is movably arranged at one end of the sliding block (44) extending to the outside of the sliding frame (41). The movable ball (45) is arranged away from the threaded rod (3). An inclined sliding surface (46) is opened at the bottom of one end of the sliding frame (41) near the threaded rod (3). The compression rubber ring (43) abuts against the inclined sliding surface (46).

3. A centering expansion bolt according to claim 2, characterized in that: The auxiliary mechanism (8) includes a compression protrusion ring (81), which is fixed to the outer wall of the bottom end of the threaded rod (3). The compression protrusion ring (81) is located on the upper side of the compression rubber ring (43). The bottom end of the sliding block (44) is provided with trapezoidal inserts (82), which are movably arranged in the sliding frame (41). The bottom end of the trapezoidal insert (82) abuts against a trigger rod (83). The trigger rod (83) extends to the outside of the sliding frame (41) from one end near the threaded rod (3). The upper end of the sliding frame (41) is provided with a vertical plane (85). A second inclined sliding surface (84) is provided between the vertical plane (85) and the first inclined sliding surface (46). The second inclined sliding surface (84) is provided on the sliding frame (41).

4. A centering expansion bolt according to claim 1, characterized in that: The expansion blocks (5) are arranged in a ring with equal spacing, and the expansion blocks (5) are elastic.

5. A centering expansion bolt according to claim 2, characterized in that: When the extrusion rubber ring (43) moves downward, the extrusion rubber ring (43) can extrude the sliding frame (41) outward.

6. A centering expansion bolt according to claim 2, characterized in that: The outer wall of the outer shell (1) is provided with four sliding frames (41) at equal intervals.

7. A centering expansion bolt according to claim 3, characterized in that: When the extrusion rubber ring (43) moves upward, it can extrude the inclined sliding surface (84) and the vertical plane (85). The extrusion rubber ring (43) is elastic.

8. A centering expansion bolt according to claim 3, characterized in that: The extrusion ring (81) can extrude the sliding block (44) toward the side away from the threaded rod (3).

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