Improved expansion screw

Abstract

The utility model discloses an improved expansion screw, which relates to the technical field of expansion screws, and comprises a nut, a spring washer and a flat washer, the middle part of the nut is in threaded connection with a countersunk bolt mechanism, the outer side of the countersunk bolt mechanism is sleeved with a sleeve mechanism, the sleeve mechanism comprises a sleeve main body, a convex ring II and a convex ring I, the countersunk bolt mechanism comprises a bolt body, a circular truncated cone and a conical strip, the bolt body moves towards the outside of a hole, the conical strip makes contact with the first convex ring and the second convex ring in sequence, the ring width of the second convex ring is larger than the ring width of the first convex ring, the outer supporting amplitude of the sleeve body is further enlarged, fastening is achieved, and the fastening effect is good. Under the condition that the overall size of a traditional expansion screw is not changed, a second convex ring, a first convex ring and a conical strip are arranged, the local position relation is changed, and the fastening capacity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion screws, in particular to an improved expansion screw. Background Art

[0002] Expansion bolts are special threaded connectors used to fix pipe supports / hangers / brackets or equipment to walls, floors, and columns.

[0003] However, conventional expansion screws in existing technologies can gradually lose their initial tightening ability when subjected to long-term vibration, tension, or pressure. For example, in some industrial equipment installation scenarios, the continuous vibration of the machine can cause fatigue in the material surrounding the expansion screw, thereby affecting the screw's fixing stability. Utility Model Content

[0004] The purpose of the utility model is to solve the problems existing in the prior art and to provide an improved expansion screw.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: an improved expansion screw, comprising a nut, a spring washer and a flat washer, the middle part of the nut is threadedly connected to a countersunk bolt mechanism, the outer side of the countersunk bolt mechanism is sleeved with a sleeve mechanism, the sleeve mechanism comprises a sleeve body, a No. 2 convex ring and a No. 1 convex ring, the countersunk bolt mechanism comprises a bolt body, a frustum and a conical bar, the No. 2 convex ring and the No. 1 convex ring are parallel to each other and are welded to the inner cavity wall of the sleeve body, multiple groups of the conical bars are welded to the outer ring surface of the frustum, and the diameter of the conical bars gradually increases from top to bottom.

[0006] Preferably, a plurality of groups of slots are provided on the lower portion of the sleeve body, and the No. 2 convex ring and the No. 1 convex ring are located in the slotted areas.

[0007] Preferably, the ring width of the No. 2 convex ring is greater than the ring width of the No. 1 convex ring.

[0008] Preferably, the frustum is arranged at the lower end of the bolt body, and the sleeve body is sleeved on the outside of the bolt body.

[0009] Preferably, the nut is threadedly connected to the upper end of the bolt body, and the spring washer is located between the nut and the flat washer.

[0010] Preferably, the flat washer and the spring washer are sequentially sleeved on the outside of the bolt body.

[0011] Compared with the prior art, the advantages and positive effects of the present invention are:

[0012] 1. In the present invention, as the bolt body moves outward from the hole, the tapered strip begins to contact the No. 1 convex ring, and the tapered strip gradually becomes thicker from top to bottom, thereby increasing the extent to which the casing body is supported. Friction self-locking is formed between the wall, the casing body and the tapered strip, thereby achieving a fixing effect. However, under an environment of long-term vibration, tension or pressure, the initial fastening ability will gradually be lost. When the nut is tightened again, the tapered strip begins to contact the No. 2 convex ring. Since the ring width of the No. 2 convex ring is greater than the ring width of the No. 1 convex ring, the extent of the external support of the casing body is further expanded, and fastening is achieved again. Without changing the overall size of the traditional expansion screw, the No. 2 convex ring, the No. 1 convex ring and the tapered strip are provided to change the local position relationship and increase the fastening ability.

[0013] 2. In the present invention, the spring washer is installed between the nut and the flat washer, and the flat washer is directly attached to the edge of the hole. When the nut is tightened, the spring washer is compressed and exerts a reaction force on the nut to prevent the nut from loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention provides a three-dimensional structural diagram of an improved expansion screw;

[0015] Figure 2 The present invention provides a schematic diagram of the three-dimensional structure of the interior of an improved expansion screw;

[0016] Figure 3 For this utility model Figure 2 A schematic diagram of the magnified three-dimensional structure in the middle;

[0017] Figure 4 The utility model provides a schematic diagram of the exploded three-dimensional structure of an improved expansion screw.

[0018] Legend: 1. Nut; 2. Spring washer; 3. Flat washer; 4. Sleeve mechanism; 41. Sleeve body; 42. No. 2 raised ring; 43. No. 1 raised ring; 44. Slot; 5. Countersunk bolt mechanism; 51. Bolt body; 52. Cone; 53. Tapered bar. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0021] Example 1: Figure 1 - Figure 4 As shown, the utility model provides an improved expansion screw, including a nut 1, a spring washer 2 and a flat washer 3. The middle part of the nut 1 is threadedly connected with a countersunk bolt mechanism 5, and the outer side of the countersunk bolt mechanism 5 is sleeved with a sleeve mechanism 4. The sleeve mechanism 4 includes a sleeve body 41, a No. 2 convex ring 42 and a No. 1 convex ring 43. The countersunk bolt mechanism 5 includes a bolt body 51, a frustum 52 and a tapered bar 53. The No. 2 convex ring 42 and the No. 1 convex ring 43 are parallel to each other and are welded to the inner cavity wall of the sleeve body 41. Multiple groups of tapered bars 53 are welded to the outer annular surface of the frustum 52. The diameter of the tapered bar 53 gradually increases from top to bottom. Multiple groups of slots 44 are provided at the lower part of the sleeve body 41. The No. 2 convex ring 42 and the No. 1 convex ring 43 are located in the slot 44 area. The ring width of the No. 2 convex ring 42 is greater than the ring width of the No. 1 convex ring 43. The frustum 52 is arranged at the lower end of the bolt body 51, and the sleeve body 41 is sleeved on the outer side of the bolt body 51.

[0022] The following is a detailed description of the specific settings and functions of this embodiment: when the nut 1 is tightened, the bolt body 51 moves outward, thereby driving the cone 52 and the tapered bar 53 to move outward, and the tapered bar 53 begins to contact the inner cavity of the lower end of the sleeve body 41, thereby forming a large positive pressure in the inner cavity of the sleeve body 41, and the sleeve body 41 begins to expand from the position of the slot 44 to achieve the purpose of expansion. As the bolt body 51 continues to move outward, the tapered bar 53 begins to contact the No. 1 convex ring 43, and the tapered bar 53 gradually becomes thicker from top to bottom, expanding the expansion of the sleeve body 41, and the wall , friction self-locking will be formed between the sleeve body 41 and the tapered bar 53, thereby achieving a fixing effect. However, under an environment of long-term vibration, tension or pressure, it will gradually lose its initial fastening ability. Tighten the nut 1 again, and the tapered bar 53 begins to contact the No. 2 convex ring 42. Since the ring width of the No. 2 convex ring 42 is greater than the ring width of the No. 1 convex ring 43, the external support of the sleeve body 41 is further expanded, and fastening is achieved again. Without changing the overall size of the traditional expansion screw, the No. 2 convex ring 42, the No. 1 convex ring 43 and the tapered bar 53 are set to change the local position relationship and increase the fastening ability.

[0023] Example 2: Figure 1 - Figure 4 As shown, the nut 1 is threadedly connected to the upper end of the bolt body 51 , the spring washer 2 is located between the nut 1 and the flat washer 3 , and the flat washer 3 and the spring washer 2 are sequentially sleeved on the outside of the bolt body 51 .

[0024] The effect achieved by the entire embodiment is that the spring washer 2 is installed between the nut 1 and the flat washer 3, and the flat washer 3 is directly attached to the edge of the hole. When the nut 1 is tightened, the spring washer 2 is compressed and exerts a reaction force on the nut 1 to prevent the nut 1 from loosening.

[0025] The method of use and working principle of this device: When using, first use an impact tool to open a hole of corresponding size on the fixed body, then install the sleeve mechanism 4 and the countersunk bolt mechanism 5 into the hole. When tightening the nut 1, the bolt body 51 moves outward, thereby driving the round table 52 and the tapered bar 53 to move outward. The tapered bar 53 begins to contact the inner cavity of the lower end of the sleeve body 41, thereby forming a large positive pressure in the inner cavity of the sleeve body 41. The sleeve body 41 begins to expand from the position of the slot 44 to achieve the purpose of expansion. As the bolt body 51 continues to move outward, the tapered bar 53 moves outward. The strip 53 begins to contact the No. 1 convex ring 43, and the tapered strip 53 gradually becomes thicker from top to bottom, which increases the extent of the expansion of the sleeve body 41. Friction self-locking will be formed between the wall, the sleeve body 41 and the tapered strip 53, thereby achieving a fixing effect. However, under long-term vibration, tension or pressure, it will gradually lose its initial fastening ability. Tighten the nut 1 again, and the tapered strip 53 begins to contact the No. 2 convex ring 42. Since the ring width of the No. 2 convex ring 42 is greater than the ring width of the No. 1 convex ring 43, the extent of the external support of the sleeve body 41 is further expanded, and fastening is achieved again.

[0026] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification, equivalent change and modification of the above embodiment made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. An improved expansion screw, comprising a nut (1), a spring washer (2) and a flat washer (3), characterized in that: The middle part of the nut (1) is threadedly connected to a countersunk bolt mechanism (5), and the outer side of the countersunk bolt mechanism (5) is sleeved with a sleeve mechanism (4), the sleeve mechanism (4) comprising a sleeve body (41), a second convex ring (42) and a first convex ring (43), the countersunk bolt mechanism (5) comprising a bolt body (51), a frustum (52) and a tapered strip (53), the second convex ring (42) and the first convex ring (43) being parallel to each other and welded to the inner cavity wall of the sleeve body (41), a plurality of groups of the tapered strips (53) being welded to the outer annular surface of the frustum (52), and the diameter of the tapered strips (53) gradually increasing from top to bottom.

2. The improved expansion screw according to claim 1, characterized in that: The lower portion of the sleeve body (41) is provided with a plurality of groups of slots (44), and the second convex ring (42) and the first convex ring (43) are located in the slot (44) area.

3. The improved expansion screw according to claim 2, characterized in that: The ring width of the second convex ring (42) is greater than the ring width of the first convex ring (43).

4. The improved expansion screw according to claim 3, characterized in that: The truncated cone (52) is arranged at the lower end of the bolt body (51), and the sleeve body (41) is sleeved on the outside of the bolt body (51).

5. The improved expansion screw according to claim 4, characterized in that: The nut (1) is threadedly connected to the upper end of the bolt body (51), and the spring washer (2) is located between the nut (1) and the flat washer (3).

6. The improved expansion screw according to claim 5, characterized in that: The flat washer (3) and the spring washer (2) are sequentially sleeved on the outside of the bolt body (51).

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