Expansion bolt

Abstract

The utility model discloses an expansion bolt which comprises a screw rod, one end of the screw rod is provided with a threaded section arranged along the side wall of the screw rod, the other end of the screw rod is provided with an expansion end, the expansion end is in a cone shape with the diameter gradually increasing from the position close to the threaded section to the position away from the threaded section, and the screw rod is sleeved with an expansion pipe. A limiting gasket is arranged at the end, close to the threaded section, of the expansion pipe, a plurality of open grooves are formed in the other end of the expansion pipe, a nut in threaded connection with the threaded section is arranged on the threaded section, and a self-locking mechanism is arranged between the nut and the limiting gasket. According to the expansion bolt, the self-locking mechanism is arranged between the nut and the limiting gasket, the nut can only rotate in one direction through matching of the pawl and the annular ratchet wheel, namely the nut can only be locked and cannot be loosened in the reverse direction, the anti-loosening performance of the expansion bolt is improved, the nut cannot be loosened due to reverse rotation along with vibration, and safety is improved; the expansion bolt cannot be detached once being installed.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to the technical field of expansion bolts. Background Art

[0002] Expansion bolts are an important fastener. The expansion bolts are fixed by using the wedge-shaped slope to promote expansion and generate friction and grip to achieve the fixing effect. One end of the screw is threaded and the other end is tapered; the outer layer is wrapped with a layer of iron sheet (some are steel pipes), and half of the iron sheet cylinder (steel pipe) has several cuts. It is generally used to fasten guardrails, awnings, air conditioners, etc. on cement, bricks and other materials.

[0003] In 201, the applicant filed a patent application with application number 201320149146.3, entitled "An Expansion Bolt", which includes a bolt body, an expansion tube, a flat washer, a spring washer and a nut. The nut, expansion tube, flat washer and spring washer are all sleeved on the bolt body, and the flat washer and spring washer are located between the expansion tube and the nut. A conical platform is provided at one end of the bolt body, and the end with a larger diameter of the conical platform is located on the outside. An open groove is provided at the outside end of the expansion tube. A reinforcing rib is provided on the end face of the flat washer located on one side of the spring washer, and the reinforcing rib is evenly distributed around the axial direction of the flat washer. The above technical solution can well prevent the flat washer from deformation, and it can still be easily disassembled after long-term use. However, the problem with this expansion bolt is that it relies on the nut for locking, and there is no anti-loosening structure between the nut and the flat washer. After long-term use in a vibrating environment, the nut is very easy to loosen, resulting in unstable fixation of the expansion bolt, affecting safety. Summary of the invention

[0004] The purpose of the utility model is to solve the problems in the prior art and to provide an expansion bolt which can improve the anti-loosening performance of the bolt and improve the firmness of the connection.

[0005] To achieve the above-mentioned purpose, the utility model proposes an expansion bolt, including a screw rod, one end of the screw rod is provided with a threaded section arranged along its side wall, and the other end is provided with an expansion end, the expansion end is a cone with a diameter gradually increasing from close to the threaded section to away from the threaded section, the screw rod outer sleeve is provided with an expansion tube, the expansion tube is provided with a limiting gasket at one end close to the threaded section, and a plurality of open grooves at the other end, the threaded section is provided with a nut threadedly connected thereto, a self-locking mechanism is provided between the nut and the limiting gasket, the self-locking mechanism includes an annular ratchet arranged on the limiting gasket close to one end of the nut, and the nut is provided with a ratchet for cooperating with the annular ratchet so that the nut can only rotate in one direction in the locking direction.

[0006] Preferably, an end of the nut close to the limiting gasket is provided with a receiving groove adapted to the annular ratchet, and the pawl is arranged at the receiving groove.

[0007] Preferably, the expansion tube is further provided with a plurality of tensioning blocks, the outer wall of the expansion tube is provided with a plurality of hollow grooves adapted to the tensioning blocks, the tensioning blocks are arranged in the hollow grooves, and one end of the tensioning blocks is connected to an end of the hollow groove away from the limiting gasket, the outer wall of the tensioning block is flush with or recessed in the outer wall of the expansion tube, the inner wall of the tensioning block is provided with a slope surface which is gradually inclined toward the axis direction of the expansion tube from the end away from the threaded section to the end close to the threaded section, and the outer wall of the screw is provided with a slope groove adapted to the slope surface.

[0008] Preferably, the tension block and the expansion tube are integrally formed.

[0009] Preferably, a plurality of ribs protruding downward are provided on the side of the limiting gasket away from the nut.

[0010] Preferably, the outer wall of the expansion tube is further provided with a plurality of anti-skid ribs which are arranged along the axial direction of the expansion tube or in the same direction as the thread rotation direction of the threaded section.

[0011] The utility model has the beneficial effects of an expansion bolt: the utility model provides a self-locking mechanism between the nut and the limiting gasket, and the nut can only rotate in one direction through the cooperation of the pawl and the annular ratchet, that is, the nut can only be tightened but not loosened in the reverse direction, thereby improving the anti-loosening performance of the expansion bolt of this embodiment, the nut will not loosen with the reversal of vibration, thereby improving safety, and the expansion bolt cannot be disassembled once installed.

[0012] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a schematic diagram of the main structure of an expansion bolt.

[0014] Figure 2 The utility model is a schematic diagram of the main cross-sectional structure of an expansion bolt.

[0015] Figure 3 It is a schematic diagram of the main structure of the expansion tube.

[0016] Figure 4 Schematic diagram of the structure of the annular ratchet and the pawl from a top view.

[0017] Figure 5 It is a schematic diagram of the structure of the nut from bottom view.

[0018] Figure 6 yes Figure 2Schematic diagram of the structure after the A part is enlarged.

[0019] Figure 7 The utility model is a structural schematic diagram of an expansion bolt when being tightened.

[0020] Figure 8 It is a schematic diagram of the expansion tube structure from bottom view.

[0021] in:

[0022] 1-screw; 2-expansion tube; 3-nut; 11-threaded section; 12-expansion end; 13-bevel groove; 21-limiting gasket; 22-opening groove; 23-annular ratchet; 31-pawl; 24-tensioning block; 201-hollow groove; 211-rib; 212-anti-slip rib; 241-slope surface, DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the scope of the utility model. In addition, in the following description, the description of the known structure and technology is omitted to avoid unnecessary confusion of the concept of the utility model.

[0024] In the description of the present utility model, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] In the description of the present utility model, it should be noted that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Embodiment 1

[0027] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7The utility model discloses an expansion bolt, comprising a screw rod 1, wherein one end of the screw rod 1 is provided with a threaded section 11 arranged along its side wall, and the other end is provided with an expansion end 12, wherein the expansion end 12 is a cone whose diameter gradually increases from close to the threaded section 11 to far away from the threaded section 11, and the outer sleeve of the screw rod 1 is provided with an expansion tube 2, wherein one end of the expansion tube 2 close to the threaded section 11 is provided with a limiting gasket 21, and the other end is provided with four open grooves 22, through which the end of the expansion tube 2 can be deformed and expanded, the threaded section 11 is provided with a nut 3 threadedly connected thereto, a self-locking mechanism is provided between the nut 3 and the limiting gasket 21, and the self-locking mechanism comprises an annular ratchet 23 arranged on the limiting gasket 21 close to one end of the nut 3, and the nut 3 is provided with a ratchet 31 for cooperating with the annular ratchet 23 so that the nut 3 can only rotate unidirectionally in the locking direction. The nut 3 can only rotate in one direction through the cooperation between the pawl 31 and the annular ratchet 23, that is, the nut 3 can only be locked and cannot be loosened in the reverse direction, thereby improving the anti-loosening performance of the expansion bolt of this embodiment, and the nut 3 will not loosen with the reverse vibration, thereby improving safety. Once the expansion bolt is installed, it cannot be disassembled.

[0028] See also Figure 2 , Figure 3 , Figure 4 and Figure 5 The nut 3 is provided with a receiving groove 32 adapted to the annular ratchet 23 at one end near the limiting gasket 21, and the pawl 31 is arranged at the receiving groove 32. The receiving groove 32 can cooperate with the annular ratchet 23 to cover the annular ratchet 23, thereby hiding it, preventing the annular ratchet 23 and the pawl 31 from being exposed and damaged, and also improving the aesthetics. Embodiment 2

[0029] See also Figure 1 , Figure 2 , Figure 6 and Figure 7On the basis of the first embodiment, the expansion tube 2 is further provided with a plurality of tensioning blocks 24, and the outer wall of the expansion tube 2 is provided with a plurality of hollow grooves 201 adapted to the tensioning blocks 24, the tensioning blocks 24 are arranged in the hollow grooves 201, and one end of the tensioning blocks 24 is connected to the end of the hollow groove 201 away from the limiting gasket 21, the outer wall of the tensioning block 24 is arranged flush with the outer wall of the expansion tube 2, the inner wall of the tensioning block 24 is provided with a slope surface 241 which is gradually inclined toward the axial direction of the expansion tube 2 from the end away from the threaded section 11 to the end close to the threaded section 11, and the outer wall of the screw 1 is provided with a slope groove 13 adapted to the slope surface 241. Under normal conditions, the outer wall of the tensioning block 24 is flush with the outer wall of the expansion tube 2. When the nut 3 is locked, it cooperates with the threaded section 11 to drive the entire screw 1 to translate toward the nut 3. At this time, the bevel groove 13 can cooperate with the slope surface 241 to squeeze the tensioning block 24 outward, so that the tensioning block 24 can protrude from the outer wall of the expansion tube 2, and can cooperate with the inner wall of the hole for placing the expansion bolt, so as to further lock the expansion tube 2, improve stability, and improve the firmness of fixation with the hole.

[0030] Preferably, the tension block 24 is integrally formed with the expansion tube 2. The integrally formed structure is more solid.

[0031] See also Figure 8 A plurality of ribs 211 are provided on the side of the limiting gasket 21 away from the nut 3 and protruding downward. The ribs 211 can improve the strength of the limiting gasket 21 and the anti-deformation performance on the one hand, and can enhance the anti-slip performance of the lower side of the limiting gasket 21 on the other hand.

[0032] See also Figure 1 and Figure 3 The outer wall of the expansion tube 2 is also provided with a plurality of anti-skid ribs 212 along the axial direction of the expansion tube 2. The anti-skid ribs 212 can improve the anti-rotation performance of the expansion tube 2 and prevent it from rotating in the fixed hole.

[0033] Working process of this utility model:

[0034] The utility model discloses an expansion bolt. During operation, a hole corresponding to the expansion bolt of the present application is pre-opened at a position to be fixed, the expansion end 12 of the expansion bolt is inserted into the hole, and then the nut 3 is tightened. During the rotation of the nut 3, the nut 3 cooperates with the threaded section 11, thereby driving the entire screw rod 1 to translate in the direction of the nut 3. The expansion end 12 cooperates with the expansion tube 2 to open the bottom of the expansion tube 2 so that the expansion tube 2 can fit into the inside of the hole. During the rotation of the nut 3, the pawl 31 cooperates with the annular ratchet 23 so that the nut 3 can only rotate in one direction. The nut 3 can only be locked but cannot be loosened in the reverse direction, thereby improving the anti-loosening performance of the expansion bolt of the present embodiment, and the nut 3 will not be loosened with the reversal of vibration.

[0035] The standard parts used in this application document can all be purchased from the market, and the specific connection methods of each part adopt mature conventional means such as bolts, rivets, welding, etc. in the prior art. The electric slide rail slide, cylinder, welding machine, electric telescopic rod and internal components of the controller all adopt conventional models in the prior art, and their internal structures belong to the prior art structure. Workers can complete normal operation of them according to the existing technical manual. In addition, the circuit connection adopts the conventional connection method in the prior art, and no specific description is given here.

[0036] It should be noted that although the above embodiments have been described in this article, this does not limit the scope of patent protection of the utility model. Therefore, based on the innovative concept of the utility model, changes and modifications to the embodiments described in this article, or equivalent structural or equivalent process changes made using the contents of the utility model specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the utility model patent.

Claims

1. An expansion bolt, comprising a screw rod (1), wherein one end of the screw rod (1) is provided with a threaded section (11) arranged along the side wall thereof, and the other end is provided with an expansion end (12), wherein the expansion end (12) is a cone-shaped end whose diameter gradually increases from close to the threaded section (11) to far away from the threaded section (11), an expansion tube (2) is provided on the outer sleeve of the screw rod (1), and a limiting gasket (21) is provided on one end of the expansion tube (2) close to the threaded section (11) and a plurality of open grooves (22) are provided on the other end, and a nut (3) is provided on the threaded section (11) and is threadably connected thereto, characterized in that: A self-locking mechanism is provided between the nut (3) and the limiting gasket (21), the self-locking mechanism comprising an annular ratchet (23) provided on the limiting gasket (21) near one end of the nut (3), and a ratchet pawl (31) is provided on the nut (3) for cooperating with the annular ratchet (23) so that the nut (3) can only rotate unidirectionally in a locking direction.

2. An expansion bolt according to claim 1, characterized in that: An end of the nut (3) close to the limiting gasket (21) is provided with a receiving groove (32) adapted to the annular ratchet (23), and the ratchet pawl (31) is arranged at the receiving groove (32).

3. An expansion bolt according to claim 1, characterized in that: The expansion tube (2) is further provided with a plurality of tensioning blocks (24); the outer wall of the expansion tube (2) is provided with a plurality of hollow grooves (201) adapted to the tensioning blocks (24); the tensioning blocks (24) are arranged in the hollow grooves (201), and one end of the tensioning blocks (24) is connected to an end of the hollow groove (201) away from the limiting gasket (21); the outer wall of the tensioning blocks (24) is flush with or recessed from the outer wall of the expansion tube (2); the inner wall of the tensioning blocks (24) is provided with a slope surface (241) which is gradually inclined toward the axial direction of the expansion tube (2) from the end away from the threaded section (11) to the end close to the threaded section (11); and the outer wall of the screw rod (1) is provided with a slope groove (13) adapted to the slope surface (241).

4. An expansion bolt as claimed in claim 3, characterized in that: The tension block (24) and the expansion tube (2) are integrally formed.

5. An expansion bolt according to claim 1, characterized in that: A plurality of ribs (211) protruding downwards are provided on a side of the limiting gasket (21) away from the nut (3).

6. An expansion bolt according to claim 1, characterized in that: The outer wall of the expansion tube (2) is also provided with a plurality of anti-slip ribs (212) which are arranged to be coiled along the axial direction of the expansion tube (2) or in the same direction as the thread rotation direction of the threaded section (11).

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