Expansion bolt
By setting grooves on the bolt body of the expansion bolt and setting protrusions on the expansion sleeve, combined with the design of the guide grooves and guide ribs, the existing expansion bolts have solved the problem of small contact area and rotation of the existing expansion bolts, which significantly improves stability and connection strength.
Patent Information
- Application Number
- CN202422028972.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-08-21
AI Technical Summary
The contact area between the bolt and the expansion tube of the existing expansion bolt is small, resulting in poor stability and load bearing capacity, and is prone to problems such as deformation and damage of the expansion tube and rotation of the plug, affecting the connection and tightening performance.
A groove is provided on the bolt body of the expansion bolt, and a protrusion that cooperates with the groove is provided on the expansion sleeve to increase the contact area between the bolt body and the expansion sleeve, and prevent the bolt from rotating through the guide groove and the guide rib.
It effectively improves the stability and bearing capacity of the expansion bolt, reduces the damage rate of the expansion sleeve, enhances the connection strength with the wall, and prevents the bolt from rotating in the expansion sleeve.
Smart Images
Figure CN222894476U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric power construction, in particular to an expansion bolt. Background Art
[0002] Expansion bolts are special threaded connectors used to fix pipeline supports / hangers / brackets or equipment on walls, floors, columns, etc. They are composed of a countersunk bolt body, an expansion tube, a flat washer, a spring washer and a hexagonal nut. There are several openings at the end of the expansion tube. When using, you must first use an impact drill (hammer) to drill holes of corresponding sizes on the fixed body, then install the bolt body and the expansion tube into the hole, and use a wrench to tighten the nut. Under the thread transmission, the bolt body moves outward, while the expansion tube outside the bolt body does not move. The countersunk head of the bolt body is brought into the open expansion tube, which expands and deforms the expansion tube, and the expansion tube is tightly squeezed on the fixed body. Tightening the nut can expand the bolt body, the expansion tube, the mounting piece and the fixed body into one.
[0003] Since only the countersunk head of the bolt body is directly connected to the expansion tube, and there is no direct contact between the bolt body rod and the expansion tube, the contact area is relatively small, and the stability and load-bearing capacity are relatively poor. If the expansion tube is severely deformed and damaged during the movement of the countersunk head into the expansion tube, the countersunk head of the bolt will have to move into the expansion tube facing the outside of the wall until it is fixedly connected to the expansion tube. At this time, the load-bearing part of the fixed body is not the actual length of the expansion tube, but the specific length from the position where the countersunk head of the bolt body moves to the surface of the fixed body, as shown in the attached figure. Figure 1 As shown, in this case, the bearing area of the fixed body is small and the stability is poor. At the same time, in the actual operation process, sometimes there is a situation where the bolt body and the expansion tube rotate with each other, which affects the connection and tightening performance of the expansion bolt. Utility Model Content
[0004] In view of the above problems, the utility model discloses an expansion bolt, the bolt body and expansion tube of which are provided with protrusions and guide mechanisms, which can effectively increase the contact area between the bolt body and the expansion tube and the embedding depth of the bolt body in the wall, thereby improving the expansion coefficient and ensuring stability.
[0005] An expansion bolt comprises a bolt body and an expansion sleeve sleeved on the outside of the bolt body, wherein the outer surface of the bolt body is provided with at least one group of grooves, wherein the grooves are located between the threaded area and the countersunk head on the bolt body, and the inner wall of the expansion sleeve is provided with protrusions which cooperate with the grooves in the initial state.
[0006] Preferably, at least one guide groove is provided between the groove area and the threaded area of the bolt body, and the inner surface of the expansion sleeve is provided with guide ribs matching with the guide groove.
[0007] Preferably, the grooves are in a plurality of groups, and each group of grooves is composed of at least two groove units evenly arranged along the circumference of the bolt body.
[0008] Preferably, the groove unit is a spherical structure smaller than 1 / 2.
[0009] Preferably, the groove closest to the countersunk head is located at the connection between the countersunk head and the bolt body.
[0010] Preferably, the plurality of groups of grooves are arranged parallel to each other along the axis direction of the bolt body.
[0011] Preferably, the groove units between two adjacent groups of grooves are arranged alternately.
[0012] Preferably, the groove units on each group of grooves are arranged in a spiral shape along the circumference of the bolt body.
[0013] Preferably, the length of the guide groove along the axial direction of the bolt body is greater than the length of the guide rib along the axial direction of the expansion sleeve.
[0014] Preferably, the guide grooves are evenly arranged along the circumference of the bolt body.
[0015] Beneficial Effects
[0016] 1. The utility model provides a groove on the bolt body of the expansion bolt, and provides a protrusion on the expansion sleeve that matches the groove, so that when the bolt body is tightened along the expansion sleeve, in addition to the contact surface of the countersunk part, the contact area between the protrusion and the bolt body is also increased, effectively improving the friction, reducing the damage rate of the expansion sleeve, increasing the extension length of the expansion in the wall, and improving the connection strength between the expansion bolt and the wall.
[0017] 2. The utility model can fix the circumferential positions of the bolt body and the expansion sleeve to each other through the guide groove on the bolt body and the guide rib on the expansion sleeve, thereby preventing the bolt body from rotating in the expansion sleeve and further improving the connection stability. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 It is a structural schematic diagram of an existing expansion bolt in the background technology after being fixed in a wall;
[0020] Figure 2 It is a schematic diagram of the structure of the expansion bolt in the utility model after being fixed in the wall;
[0021] Figure 3 It is a position relationship diagram between the bolt body of the expansion bolt and the expansion sleeve before being tightened in the utility model;
[0022] Figure 4 yes Figure 3 Middle AA section view;
[0023] Figure 5 yes Figure 3 Middle BB section view;
[0024] In the figure, 1, expansion sleeve, 1-1, guide rib, 1-2, protrusion, 2, bolt body, 2-1, guide groove, 2-2, groove unit. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.
[0026] like Figure 1 As shown, in the prior art, the expansion bolt is fixed by the bolt body squeezing the expansion sleeve outward to the expansion limit of the expansion sleeve and then tightening it between the countersunk head and the expansion sleeve. If the expansion sleeve is of poor quality, it will crack, and the bolt body will continue to move toward the outside of the wall until the expansion sleeve can squeeze the bolt body. The length of the bolt body remaining in the wall is relatively short, and the bearing capacity is relatively weak. Under heavy load, the wall may be damaged and the load may fall, causing safety hazards and significant economic losses.
[0027] Embodiment 1
[0028] The utility model discloses a Figure 2-5 The expansion bolt shown in the figure has two groups of grooves processed in sequence along the axis direction on the bolt body 2 of the expansion bolt, and each group of grooves includes two groove units 2-2 that are mutually symmetrical about the axis, and the groove unit is a spherical structure less than 1 / 2. The groove close to the countersunk head 3 is located at the connection between the countersunk head 3 and the left end of the bolt body 2. At the same time, a protrusion 1-2 that matches the position of the groove unit 2-2 is processed on the inner side wall of the expansion sleeve 1, and the material is the same as that of the expansion sleeve. In the initial position state, the protrusion 1-2 is located in the groove unit 2-2. As the nut is turned, the bolt body 2 moves linearly to the right along the expansion sleeve 1, and the protrusion is removed from the groove and squeezed between the expansion sleeve 1 and the bolt body 2, increasing the contact area between the expansion sleeve and the bolt body, thereby increasing the expansion coefficient. According to statistics, the structural coefficient in this structural state is more than 5 times the expansion coefficient before the groove and protrusion are set. Because the protrusion squeezes the bolt body and the expansion sleeve tightly, the friction is increased, thereby reducing the probability that the bolt body will rotate circumferentially in the expansion sleeve.
[0029] In order to further increase the stability and prevent the bolt body 2 from rotating in the expansion sleeve 1, a guide groove 2-1 is processed along the axial direction between the groove area and the threaded area of the bolt body 2. The three guide grooves are evenly arranged along the circumference of the bolt body and staggered with the arrangement of the groove unit 2-2, that is, the guide groove and the groove unit are not on the same straight line. On the inner side wall of the expansion sleeve 1, a guide rib 1-1 with a position and shape corresponding to the guide groove is arranged in the area between the convex area and the threaded area. The extension length of the guide rib is less than the extension length of the guide groove, that is, the guide rib can slide in the groove along the axial direction of the expansion sleeve and the bolt body.
[0030] Embodiment 2
[0031] In this embodiment, the groove units 2-2 in two adjacent groups of grooves are arranged alternately, which can improve the overall strength of the bolt body and prevent the bolt body from having duplicate grooves on a side line parallel to the axis, resulting in a weak force-bearing surface.
[0032] Embodiment 3
[0033] In this embodiment, each group of groove units 1-2 is three, and the three groove units are arranged in a spiral shape along the circumference of the bolt body. This arrangement can make the contact between the bolt body and the expansion sleeve more uniform and stable.
[0034] Although an embodiment of the utility model has been shown and described, this specific embodiment is merely an explanation of the utility model and is not a limitation of the utility model. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the utility model. However, as long as they are within the scope of the claims of the utility model, they are protected by patent law.
Claims
1. An expansion bolt, comprising a bolt body (2) and an expansion sleeve (1) sleeved on the outside of the bolt body, characterized in that: The outer surface of the bolt body (2) is provided with at least one group of grooves, the grooves being located between the threaded area on the bolt body and the countersunk head (3), and the inner wall of the expansion sleeve is provided with protrusions (1-2) which cooperate with the grooves in an initial state.
2. An expansion bolt according to claim 1, characterized in that: The plurality of groups of grooves are arranged parallel to each other along the axis direction of the bolt body (2).
3. An expansion bolt according to claim 1, characterized in that: The groove units between two adjacent groups of grooves are arranged alternately.
4. An expansion bolt according to claim 1, characterized in that: The grooves are in multiple groups, and each group of grooves comprises at least two groove units (2-2) evenly arranged along the circumference of the bolt body.
5. An expansion bolt according to claim 4, characterized in that: The groove unit (2-2) is a spherical structure smaller than 1 / 2.
6. An expansion bolt according to claim 4, characterized in that: The groove closest to the countersunk head (3) is located at the connection between the countersunk head and the bolt body (2).
7. An expansion bolt according to claim 4, characterized in that: The groove units on each group of grooves are arranged in a spiral shape along the circumference of the bolt body.
8. The expansion bolt according to claim 1, characterized in that: At least one guide groove (2-1) is provided between the groove area and the threaded area of the bolt body, and the inner surface of the expansion sleeve (1) is provided with a guide rib (1-1) that cooperates with the guide groove.
9. An expansion bolt according to claim 8, characterized in that: The length of the guide groove (2-1) along the axial direction of the bolt body (2) is greater than the length of the guide rib (1-1) along the axial direction of the expansion sleeve (1).
10. An expansion bolt according to claim 8, characterized in that: The guide grooves are evenly arranged along the circumference of the bolt body.