Novel expansion bolt
By designing barbs and ribs on the expansion plate, the mechanical interlock between the expansion bolt and the substrate is enhanced, solving the problem of the expansion bolt coming out of the hole under high tension and achieving a more stable fixing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-13
- Publication Date
- 2026-03-24
AI Technical Summary
Existing expansion bolts are at risk of coming out of the hole under high tensile force, indicating insufficient tightening.
The expansion plate is designed as multiple cards, which are bent outward to form a barbed structure. It can also be equipped with inward ribs and slit structures to increase the contact area and engagement points with the substrate hole wall, forming a mechanical interlock.
It significantly improves the tensile load-bearing capacity and stability of expansion bolts, reduces the risk of loosening and falling off, and ensures the reliability and safety of the connection.
Smart Images
Figure CN224032910U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to expansion bolt technical field, in particular to a novel expansion bolt. BACKGROUND
[0002] Expansion bolt is a kind of connecting piece that is achieved fastening by mechanical expansion principle, is widely used in building, decoration, mechanical installation and other fields.The core function is to fix object in hard base material such as concrete, brick wall, rock, etc., provide reliable tensile, shear and impact resistance.
[0003] As shown in Figure 1 A conventional expansion bolt is shown, which includes expansion sleeve (100), bolt (200) and nut (300), one end of expansion sleeve (100) is provided with multiple expansion sheets (110), and one end of bolt (200) is provided with expansion cone (210) of conical structure, nut (300) is threadedly connected on bolt (200);When applying, hole (slightly larger than the outer diameter of expansion sleeve) matched with expansion sleeve is drilled on base material, sleeve part of expansion bolt is inserted into hole, and bolt tail is ensured to be exposed.By rotating nut by spanner, expansion cone on bolt will extrude expansion sheet, make it expand outward, and clamp hole wall, to realize the fixation of expansion bolt in hole.However, the expansion sheet on expansion bolt is smooth surface, there is still the risk of separating from hole under large tension, and the fastening of existing expansion bolt on hole still has improvement space. UTILITY MODEL CONTENTS
[0004] Therefore, the utility model provides a novel expansion bolt, to improve the stability of expansion bolt installed in hole, realize more safe and stable fixed application.
[0005] The utility model provides the scheme, which includes:
[0006] A novel expansion bolt includes expansion sleeve, bolt and nut, the expansion sleeve includes tube body and multiple expansion sheets at one end of tube body, the first side of expansion sheet is formed with multiple cards by punching, the card is outwardly bent to form barb structure, and multiple cards are arranged along the length direction of expansion sheet.
[0007] As a further optional scheme, the first side of expansion sheet is also provided with inwardly bent convex rib, and the length direction of convex rib is arranged along the length direction of expansion sheet.
[0008] As a further optional solution, the first side of the expansion sheet is provided with a first slit opened along the width direction of the expansion sheet from the edge position, a second slit arranged along the length direction of the expansion sheet, the first slit and the second slit perpendicularly intersect, and the two ends of the second slit extend laterally to a third slit away from the first slit.
[0009] As a further optional solution, the second side of the expansion sheet is inwardly protruded to form a plurality of protruding portions arranged along the length direction of the expansion sheet.
[0010] As a further optional solution, among the plurality of protruding portions, the protruding length of the protruding portion closer to the end of the expansion sheet is shorter.
[0011] As a further optional solution, the protruding portion is formed by stamping on the second side of the expansion sheet.
[0012] As a further optional solution, the second side of the expansion sheet is provided with a fourth slit arranged along the length direction of the expansion sheet.
[0013] As a further optional solution, the included angle between the card and the axis of the tube body in the natural state is 40-60°.
[0014] As a further optional solution, the length of the expansion sheet is 20-50 mm; and the length of the expansion cone at the end of the bolt is adapted to the length of the expansion sheet.
[0015] Compared with the prior art, the novel expansion bolt has at least the following beneficial effects:
[0016] The novel expansion bolt improves the fixing stability, the card formed by stamping on the first side of the expansion sheet forms a barb structure after being bent, when the expansion bolt bears a pulling force, the barb structure and the hole wall of the base material form mechanical interlocking, and the reaction force generated by the clamping force is used to resist the pulling force. A plurality of cards are distributed along the length direction of the expansion sheet, effectively increasing the contact area and engagement points with the hole wall of the base material, and greatly improving the friction force and the pull-out resistance between the expansion sleeve and the base material. Compared with the traditional smooth-surfaced expansion sheet, this structure can effectively inhibit the axial displacement of the expansion sleeve under large pulling force working conditions, significantly improve the tensile load-bearing capacity of the expansion bolt, and ensure the stability and reliability of the connected structure. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is a structural schematic view of an expansion bolt in the prior art;
[0018] Figure 2 is a structural schematic view of an expansion sleeve in the embodiment of the utility model;
[0019] Figure 3is a structure schematic view of the inflation sheet of the embodiment of the utility model;
[0020] Figure 4 is a structure schematic view of the inflation sheet of the embodiment of the utility model;
[0021] Figure 5 is a punching structure schematic view of the inflation sheet of the embodiment of the utility model;
[0022] Figure 6 is a structure schematic view of the protruding part in the inflation sheet of the embodiment of the utility model;
[0023] Figures 2-6 Middle: 10, inflation sleeve; 1, pipe body; 2, inflation sheet; 3, card; 4, protruding rib; 5, protruding part;
[0024] 20, bolt; 201, inflation cone;
[0025] L1, first slit; L2, second slit; L3, third slit; L4, fourth slit. DETAILED DESCRIPTION
[0026] The specific embodiments of the utility model are described in further detail below in combination with the drawings and embodiments. The following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.
[0027] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.
[0028] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0029] In the present utility model, unless otherwise expressly provided and limited, the first feature is "on" or "under" the second feature, which can be direct contact of the first and second features, or indirect contact of the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0030] Reference Figures 2-6 An embodiment of the present utility model shows a kind of novel expansion bolts, including expansion sleeve 10, bolt 20 and nut (not shown), the expansion sleeve 10 includes tube body 1 and the plurality of expansion sheets 2 at the one end of tube body 1, the first side of the expansion sheet 2 is stamped to form multiple cards 3, the card 3 is outwardly bent to form barb structure, multiple cards 3 are arranged along the length direction of the expansion sheet 2.
[0031] Specifically, the card 3 of the first side of the expansion sheet 2 is bent to form barb structure, when expansion bolt bears tension, barb structure and substrate hole wall form mechanical interlocking, and the reaction force generated by clamping force is used to resist tension. Multiple cards 3 are distributed along the length direction of the expansion sheet 2, effectively increase the contact area and engagement point with the substrate hole wall, greatly improve the friction and pullout resistance between the expansion sleeve 10 and the substrate. Compared with the traditional smooth surface expansion sheet 2, this structure can effectively inhibit the axial displacement of the expansion sleeve 10 under large tension working condition, significantly improve the tensile load capacity of the expansion bolt 10, and ensure the stability and reliability of the connection structure.
[0032] Wherein, the barb structure of card 3 effectively reduces the failure risk of expansion bolt caused by loosening and falling off. By strengthening the anchoring effect of expansion sleeve 10 and substrate, whether in construction engineering to fix large bearing members or in decoration scene to install heavy equipment, long-term stable fastening connection can be realized, safety accidents caused by fixation failure are avoided, and the safety of engineering and equipment operation is ensured.
[0033] In the embodiment, the included angle between the card 3 and the axis of the tube body 1 in the natural state is 40-60°.
[0034] In some embodiments, as shown in Figure 3 And Figure 4 The first side of the expansion sheet 2 is also provided with inwardly bent protruding ribs 4, and the length direction of the protruding ribs 4 is arranged along the length direction of the expansion sheet 2.
[0035] The rib 4 extends along the length of the expansion piece 2, acting as a reinforcing rib inside the expansion piece 2, effectively enhancing the overall rigidity and bending resistance of the expansion piece 2. When the barbed structure of the card 3 is subjected to a large tensile force, the rib 4 can disperse the stress distribution, preventing the expansion piece 2 from deforming or breaking due to local stress concentration, thus improving the durability and reliability of the expansion sleeve structure.
[0036] Furthermore, since card 3 is punched into expansion sheet 2, this processing method inevitably creates cuts in expansion sheet 2, altering its original stress distribution and weakening its structural strength to some extent. The rib 4, bent inwards and extending along the length of expansion sheet 2, effectively compensates for the negative impact of card 3 punching on the strength of expansion sheet 2. The rib 4 effectively mitigates this negative impact. When card 3 is subjected to significant tensile force, the rib 4, together with the unpunched portion of expansion sheet 2, resists external forces, ensuring the structural integrity of expansion sheet 2 under complex stress conditions and further enhancing the overall load-bearing capacity of the expansion sleeve.
[0037] In some embodiments, to facilitate the formation of the card 3 and the rib 4, such as Figure 5 As shown, the first side of the expansion sheet 2 is provided with a first slit L1 opened from the edge position along the width direction of the expansion sheet 2 and a second slit L2 arranged along the length direction of the expansion sheet 2. The first slit L1 and the second slit L2 intersect perpendicularly, and the two ends of the second slit L2 extend laterally away from the first slit L1 to form a third slit L3.
[0038] Among them, Figure 5 From this perspective, the card 3 is formed below the first slit L1, and the rib 4 is formed to the left of the third slit L3. The card 3 is bent outwards, and the rib 4 is bent downwards. Figure 5 The dotted lines in the text represent the bends.
[0039] In some embodiments, such as Figures 3-6 As shown, the second side of the expansion plate 2 protrudes inward to form multiple protrusions 5, which are arranged along the length of the expansion plate 2. These protrusions 5 can form multiple points of contact with the bolt 200, making the structure more stable.
[0040] In some embodiments, such as Figure 6 As shown, among the multiple protrusions 5, the protrusions 5 closer to the end of the expansion plate 2 have shorter protrusion lengths. This makes it easier for the expansion cone 210 on the bolt 200 to cause the expansion plate 2 to expand outward.
[0041] In order to facilitate the formation of the protrusion 5, such as Figure 5As shown, the protruding part 5 is formed by stamping on the second side of the expansion sheet 2. The second side of the expansion sheet 2 is provided with a fourth slit L4 arranged along the length direction of the expansion sheet 2. Figure 5 The dashed line in the figure represents the bending position.
[0042] In some embodiments, the length of the expansion sheet 2 is set to 20-50mm. The length of the expansion sheet 2 can be increased or decreased according to the size of the new expansion bolt 1 specification / diameter; specifically, compared with the length of the expansion sheet of the prior art expansion bolt, the length of the expansion sheet 2 is increased in the present embodiment, so that the contact area between the expansion sheet 2 and the inner wall of the hole is larger, and the barb structure outside the expansion sheet 2 is matched, further improving the clawing force between the expansion sheet 2 and the inner wall of the hole, so that the connection between the two is more stable. Correspondingly, the length of the expansion cone 201 at the end of the bolt 20 is matched with the length of the expansion sheet 2, so that the expansion cone 201 at the end of the bolt 20 can expand the expansion sheet 2.
[0043] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.
[0044] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.
Claims
1. A novel expansion bolt, comprising an expansion sleeve, a bolt, and a nut, wherein the expansion sleeve comprises a tube body and multiple expansion plates located at one end of the tube body, characterized in that, Multiple cards are stamped on the first side of the expansion sheet, and the cards are bent outward to form a barbed structure. The multiple cards are arranged along the length direction of the expansion sheet.
2. The novel expansion bolt according to claim 1, characterized in that, The first side of the expansion sheet is also provided with an inwardly bent rib, and the length direction of the rib is arranged along the length direction of the expansion sheet.
3. The novel expansion bolt according to claim 2, characterized in that, The first side of the expansion sheet is provided with a first slit opened from the edge along the width direction of the expansion sheet, a second slit arranged along the length direction of the expansion sheet, the first slit and the second slit intersecting perpendicularly, and a third slit extending laterally from both ends of the second slit away from the first slit.
4. The novel expansion bolt according to any one of claims 1-3, characterized in that, The second side of the expansion sheet protrudes inward to form multiple protrusions, which are arranged along the length of the expansion sheet.
5. The novel expansion bolt according to claim 4, characterized in that, Among the multiple protrusions, the protrusions closer to the end of the expansion plate have shorter protrusion lengths.
6. The novel expansion bolt according to claim 4, characterized in that, The protrusion is formed by stamping on the second side of the expansion piece.
7. The novel expansion bolt according to claim 6, characterized in that, The second side of the expansion sheet is provided with a fourth slit along the length of the expansion sheet.
8. The novel expansion bolt according to claim 1, characterized in that, In its natural state, the angle between the card and the axis of the tube is 40-60°.
9. The novel expansion bolt according to claim 1, characterized in that, The length of the expansion plate is 20-50mm; the length of the expansion cone at the end of the bolt is adapted to the length of the expansion plate.