Expansion bolt and connecting assembly

Abstract

The utility model relates to an expansion bolt and a connecting assembly. The expansion bolt comprises a movable sleeve, a screw rod and a nut. Threads matched with the nut are arranged on the side wall of the first end of the screw rod, and insections are arranged on the side wall of the second end of the screw rod; the movable sleeve expands outwards in the radial direction after being extruded, inner insections matched with the insections of the screw are arranged on the inner side wall of the movable sleeve, and friction lines used for enhancing friction force are arranged on the outer side wall of the movable sleeve. During use, the movable sleeve is firstly plugged into the hole, then the screw rod is knocked into the movable sleeve, the screw rod extrudes the movable sleeve through the insections to expand outwards, so that the movable sleeve is fixed in the hole, the screw rod is also fixed through interaction of the insections, and the screw rod is prevented from loosening and retreating. According to the scheme, the insection is arranged on the outer side wall of the screw of the expansion bolt, the insection is arranged on the inner wall of the movable sleeve, the friction lines are arranged on the outer wall of the movable sleeve, the fixing effect of the expansion bolt is well enhanced, and loosening of the fixing frame is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical parts, in particular to an expansion bolt and a connection assembly. Background Art

[0002] Bolt assemblies are known as the "adhesives" between mechanical parts and are usually used to achieve the fastening of workpieces. An expansion bolt is a special threaded connector used to fix pipeline supports / hangers / brackets or equipment on walls, floors, or columns. Existing expansion bolts consist of a countersunk bolt, an expansion tube, a flat washer, a spring washer, and a hexagonal nut. When in use, a hole of corresponding size must be drilled in the fixed body first, and then the bolt and the expansion tube are inserted into the hole, and the nut is tightened to make the bolt, the expansion tube, the installation part, and the fixed body expand and tighten into one. However, for relatively soft base bodies, existing expansion bolts are prone to loosening, resulting in the phenomenon that the bolts are not firmly fixed, greatly affecting the fixing effect; and the existing expansion bolts have fewer fixing points on the expansion tube, resulting in insecure fixing and even the problem of component detachment may occur. Summary of the Utility Model

[0003] Based on this, in view of the problem that existing expansion bolts are not firmly fixed, it is necessary to provide an expansion bolt and a connection assembly.

[0004] This embodiment provides an expansion bolt, including a movable sleeve, a screw rod, and a nut;

[0005] The side wall of the first end of the screw rod is provided with threads adapted to the nut, and the side wall of the second end of the screw rod is provided with tooth threads;

[0006] The movable sleeve expands radially outward after being extruded. The inner side wall of the movable sleeve is provided with inner tooth threads adapted to the tooth threads of the screw rod, and the outer side wall of the movable sleeve is provided with friction threads for enhancing friction.

[0007] Further, the tooth threads of the screw rod and the inner tooth threads of the movable sleeve are both annular tooth threads. The tooth threads of the screw rod gradually incline radially outward from the second end to the first end. The inner teeth of the movable sleeve gradually incline radially inward from the first end to the second end.

[0008] Further, the movable sleeve is made by bending a metal sheet into a ring shape, and the outer side wall of the movable sleeve is provided with a plurality of protruding portions.

[0009] Further, a protruding knocking portion is provided at the end face position of the first end of the screw rod, and the diameter of the knocking portion is smaller than the diameter of the screw rod body.

[0010] Further, the wall thickness of the movable sleeve gradually becomes thicker from the first end to the second end, or the screw rod gradually becomes thicker from the second end to the first end.

[0011] On the other hand, the present utility model also proposes a connection assembly, which is fixed using the expansion bolt as described above.

[0012] The solution provided by the present utility model sets tooth patterns on the outer side wall of the screw rod of the expansion bolt, tooth patterns on the inner wall of the movable sleeve, and friction patterns on the outer wall, which greatly enhances the fixing effect of the expansion bolt and avoids the loosening of the fixing frame. During use, first insert the movable sleeve into the hole, and then knock the screw rod into the movable sleeve. The screw rod squeezes the movable sleeve through the tooth patterns to expand outward, so that the movable sleeve is fixed in the hole, and the interaction of the tooth patterns also fixes the screw rod, avoiding the screw rod from loosening and withdrawing. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of an embodiment of an expansion bolt of the present utility model;

[0014] Figure 2 It is a schematic structural diagram of an embodiment of an expansion bolt of the present utility model during the first-step installation;

[0015] Figure 3 It is a schematic structural diagram of an embodiment of an expansion bolt of the present utility model during the second-step installation;

[0016] Figure 4 It is a schematic structural diagram of the movable sleeve of an embodiment of an expansion bolt of the present utility model;

[0017] Figure 5 It is a schematic structural diagram of the expanded movable sleeve of an embodiment of an expansion bolt of the present utility model;

[0018] Figure 6 It is a schematic cross-sectional diagram of the movable sleeve of an embodiment of an expansion bolt of the present utility model;

[0019] Figure 7 It is a schematic structural diagram of the screw rod of an embodiment of an expansion bolt of the present utility model.

[0020] In the drawings, the list of components represented by each reference numeral is as follows:

[0021] 1. Movable sleeve; 11. Inner tooth pattern; 12. Friction pattern; 2. Screw rod; 21. Thread; 22. Tooth pattern; 23. Knocking part; 3. Nut; 4. Spring washer; 5. Washer. Detailed Embodiment

[0022] To make the above objects, features, and advantages of the present utility model more apparent and understandable, the following describes the specific embodiments of the present utility model clearly and completely with reference to the accompanying drawings. Obviously, the specific details described below are only some embodiments of the present utility model, and the present utility model can also be implemented in many other embodiments different from those described herein. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts belong to the protection scope of the present utility model.

[0023] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the description of the present utility model in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0025] In one embodiment, please refer to Figures 1 to 7 As shown, the present utility model provides an expansion bolt, including a movable sleeve 1, a screw rod 2, and a nut 3; wherein,

[0026] A thread 21 adapted to the nut 3 is provided on the side wall of the first end of the screw rod 2, and a tooth thread 22 is provided on the side wall of the second end of the screw rod 2;

[0027] After being squeezed, the movable sleeve 1 expands radially outward. An internal tooth thread 11 adapted to the tooth thread 22 of the screw rod 2 is provided on the inner side wall of the movable sleeve 1, and a friction thread 12 for enhancing friction is provided on the outer side wall of the movable sleeve 1.

[0028] Referring to the attached Figure 2 and the attached Figure 3 As shown, in the solution provided by the present utility model, a tooth thread 22 is provided on the outer side wall of the screw rod 2 of the expansion bolt, an internal tooth thread 11 is provided on the inner wall of the movable sleeve 1, and a friction thread 12 is provided on the outer wall of the movable sleeve 1, which well enhances the fixing effect of the expansion bolt and avoids the loosening of the fixing bracket. When in use, first insert the movable sleeve 1 into the hole, and then knock the screw rod 2 into the movable sleeve 1. The screw rod 2 squeezes the movable sleeve 1 to expand outward through the tooth thread, so that the movable sleeve 1 is fixed in the hole, and the interaction of the tooth threads also fixes the screw rod 2, avoiding the screw rod 2 from loosening and withdrawing.

[0029] Referring to the attachedFigure 4 、Attachment Figure 5 and attachment Figure 6 As shown, in the embodiment of the present utility model, the tooth pattern 22 of the screw rod 2 and the inner tooth pattern 11 of the movable sleeve 1 are both annular tooth patterns. The tooth pattern 22 of the screw rod 2 gradually inclines radially outward from the second end to the first end. The inner teeth of the movable sleeve 1 gradually incline radially inward from the first end to the second end.

[0030] It can be understood that the annular tooth pattern structure is convenient for processing, and the inclined tooth pattern facilitates the insertion of the screw rod 2 into the movable sleeve. After fixation, the screw rod 2 can be prevented from loosening and withdrawing from the movable sleeve, greatly improving the convenience and stability of the bolt assembly.

[0031] Referring to the attachment Figure 6 As shown, in this embodiment, further, a convex knocking part 23 is provided at the end face position of the first end of the screw rod 2, and the diameter of the knocking part 23 is smaller than the diameter of the main body of the screw rod 2. Specifically, the knocking part 23 is a frustum-shaped that gradually reduces radially along the axial direction of the screw rod 2.

[0032] It should be noted that when the screw rod 2 is installed, it needs to be knocked into the movable sleeve 1. Since the end face position of the screw rod 2 may be deformed during knocking, this reduced knocking part 23 is provided at the end face in this embodiment to prevent the nut 3 from being unable to be sleeved and threadedly connected with the screw rod 2 after deformation.

[0033] On this basis, further, referring to the attachment Figure 5 As shown, the movable sleeve 1 is made by bending a metal sheet into a ring shape, and a plurality of convex parts are evenly provided on the outer side wall of the movable sleeve 1. For the purpose of enhancing the fixing effect, the shape and position distribution of the convex parts can be diverse and are not limited to the description in this embodiment.

[0034] Among them, the movable sleeve 1 made by bending a metal sheet into a ring shape is convenient for it to expand radially outward after being extruded by the screw rod 2 to realize the product function. Among them, the movable sleeve can be made of iron, steel or other materials, and is not limited to the description in this embodiment.

[0035] It can be understood that during use, when the movable sleeve 1 expands, the convex parts are extruded into the wall to form a plurality of fixing points, greatly enhancing the fixing effect of the expansion bolt and avoiding the problem of bolt loosening caused by a single fixing point, ensuring the stability of the product.

[0036] In an embodiment of the present utility model, the wall thickness of the movable sleeve 1 gradually increases from the first end to the second end. It can be understood that with such a structure, during the process of driving the screw 2 into the movable sleeve 1, the movable sleeve 1 will be gradually expanded after being squeezed by the screw 2 and fixed by squeezing against the outer wall. Through this structure, the fixing effect can be well improved and loosening can be prevented. Of course, the solution of the present utility model can also use other structures to achieve the purpose of squeezing and expanding the movable sleeve 1, and it is not limited to the description in this embodiment.

[0037] In another embodiment of the present utility model, the screw 2 gradually becomes thicker from the second end to the first end. It should be noted that, similar to the previous embodiment, during the process of driving the screw 2 into the movable sleeve 1, the movable sleeve 1 will be gradually expanded after being squeezed by the screw 2 and fixed by squeezing against the outer wall. Through this structure, the fixing effect can be well improved and loosening can be prevented.

[0038] In an embodiment of the present utility model, a spring washer 4 and a washer 5 are sequentially arranged between the movable sleeve 1 and the nut 3, and the nut 3 is a locknut 3. Through the above structure, the tightness of the combination between the nut 3 and the screw 2 is increased, the loosening of the nut 3 is avoided, and the fixing effect is improved. Among them, the locknut 3 can be mechanical lock, friction lock or structural lock, etc., and it is not limited to the description in this embodiment.

[0039] On the other hand, the present utility model also proposes a connection assembly, which uses the above expansion bolt and related supporting components to carry out the fixing connection work.

[0040] When using this expansion bolt, a corresponding movable sleeve 1 is sleeved in the drill hole, the screw 2 is inserted, and the end of the screw 2 is hammered with a heavy object such as a hammer so that the outer width of the movable sleeve 1 is small inside and matches the screw 2. Hammering makes the screw 2 extend into the movable sleeve 1, and the screw 2 is tightly engaged with the sleeve through the matching tooth patterns between the movable sleeve 1 and the screw 2 without loosening; at the same time, the movable sleeve 1 is opened during the hammering process, so that the movable sleeve 1 closely adheres to the wall. Because there are rough and raised friction lines 12 on the outside of the movable sleeve 1, the friction force with the wall is increased, and the raised part is fixed by embedding in the wall and other ways, so that multiple fixing points are formed, avoiding the loosening caused by a single fixing point of the traditional expansion bolt. This solution not only solves the problem that the expansion bolt is easy to loosen, but also is more suitable for use in places with relatively soft bases than the traditional expansion bolt. After installing the movable sleeve 1 and the screw 2, the fixed workpiece can be assembled, and then the elastic washer, the lock washer 5 and the fastening locknut 3 can be installed in sequence.

[0041] The technical features of the above embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0042] The above embodiments only represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations, substitutions and improvements can be made, and these should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the claims.

Claims

1. An expansion bolt, characterized in that: include: Movable sleeve, screw and nut; The first end side wall of the screw rod is provided with a thread matched with the nut, and the second end side wall of the screw rod is provided with a tooth pattern; The movable sleeve expands radially outward after being squeezed, the inner side wall of the movable sleeve is provided with inner tooth patterns matching the tooth patterns of the screw, and the outer side wall of the movable sleeve is provided with friction patterns for enhancing friction.

2. The expansion bolt according to claim 1, characterized in that: The tooth pattern of the screw and the inner tooth pattern of the movable sleeve are both annular tooth patterns.

3. The expansion bolt according to claim 1, characterized in that: The tooth pattern of the screw gradually tilts radially outward from the second end to the first end, and the inner teeth of the movable sleeve gradually tilt radially inward from the first end to the second end.

4. The expansion bolt according to claim 1, characterized in that: A protruding striking portion is provided at the end surface of the first end of the screw rod, and the diameter of the striking portion is smaller than the diameter of the screw rod body.

5. The expansion bolt according to claim 1, characterized in that: The movable sleeve is made by bending a metal sheet into a ring shape.

6. The expansion bolt according to claim 1, characterized in that: The outer side wall of the movable sleeve is provided with a plurality of protrusions.

7. The expansion bolt according to any one of claims 1 to 6, characterized in that: The thickness of the wall of the movable sleeve gradually increases from the first end to the second end.

8. The expansion bolt according to any one of claims 1 to 6, characterized in that: The screw gradually becomes thicker from the second end toward the first end.

9. The expansion bolt according to claim 1, characterized in that: A spring washer and a gasket are arranged in sequence between the movable sleeve and the nut, and the nut is a locking nut.

10. A connection assembly, characterized in that: include: An expansion bolt as claimed in any one of claims 1 to 9.

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