Post-expansion screw anchor bolt

Abstract

The utility model belongs to the technical field of fasteners, and particularly discloses a rear expansion screw anchor bolt which comprises a positioning rod, a connecting sleeve and an expansion sleeve, the connecting sleeve and the expansion sleeve are arranged on the outer side of the positioning rod in a sleeving mode, a supporting head is arranged at the tail end of the positioning rod, and the expansion sleeve is located between the connecting sleeve and the supporting head. The expansion sleeve comprises a stabilizing section and an expansion section, the stabilizing section is close to the connecting sleeve, the expansion section is close to the supporting head, and a plurality of first anti-disengaging protruding blocks are arranged between the stabilizing section and the expansion section. A plurality of second anti-falling protruding blocks are arranged on the side edge of the stabilizing section, and a plurality of semicircular grooves are formed in the upper portion of the stabilizing section. The expansion sleeve comprises an expansion section, a plurality of partition grooves are formed in the expansion section, the expansion section is divided into a plurality of expansion pieces through the partition grooves, each expansion piece is provided with anti-skid lines, the expansion pieces passing through the expansion sleeve are expanded through the supporting head, and after the expansion pieces are expanded, the anti-skid lines are formed in the expansion sleeve. The friction and fastening effects are improved through the first anti-falling protruding blocks, the second anti-falling protruding blocks and the anti-sliding lines on the expansion pieces.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a post-expansion screw anchor bolt. Background Art

[0002] The expansion bolt mainly includes a screw rod, an expansion sleeve and a nut mounted on the screw rod. The nut can move along the screw rod as the screw rod rotates to compress the expansion sleeve. After being compressed, the expansion sleeve will expand to achieve fixation.

[0003] Existing expansion bolts are generally anchoring devices made of metal materials with strong corrosion resistance and urbanizing ability, such as the Chinese utility model patent with announcement number CN201539478U, which specifically discloses a post-expansion screw anchor bolt.

[0004] However, most expansion tubes of expansion bolts currently on the market are made of steel tubes, and the surface of the expansion tubes is smooth. When the expansion tubes are opened, they stick to the hole wall, and they are prone to loosening after long-term use, resulting in the risk of the fasteners falling off. Utility Model Content

[0005] The purpose of the present invention is to provide a post-expansion screw anchor bolt to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a post-expansion screw anchor bolt comprising a positioning rod, a connecting sleeve and an expansion sleeve sleeve sleeved outside the positioning rod, a support head disposed at the end of the positioning rod, and the expansion sleeve positioned between the connecting sleeve and the support head. The support head is used to expand the expansion sleeve.

[0007] The expansion sleeve includes a stabilizing section and an expansion section. The stabilizing section is close to the connecting sleeve, and the expansion section is close to the support head. A number of first anti-slip protrusions are provided between the stabilizing section and the expansion section. A number of second anti-slip protrusions are provided on the side of the stabilizing section, and a number of semicircular grooves are provided above the stabilizing section. A number of dividing grooves are provided on the expansion section, and the expansion section is divided into a number of expansion sheets by the dividing grooves. Each of the expansion sheets is provided with anti-slip grooves. The expansion sleeve is pressed downward by the connecting sleeve so that the expansion sheets of the expansion sleeve are expanded through the support head. After expansion, the first anti-slip protrusion, the second anti-slip protrusion and the anti-slip grooves on the expansion sheet are used to improve the friction and fastening effect.

[0008] As a preferred embodiment of the present invention, the dividing groove includes a circular groove, a connecting groove and an outward expansion groove connected in sequence. The outward expansion groove is located at the end of the expansion section. The circular groove is the deformation end of the expansion piece. Then, several expansion pieces are separated by the connecting groove and the outward expansion groove to facilitate the expansion of the expansion piece.

[0009] As a preferred embodiment of the present invention, the first anti-slipping protrusion and the second anti-slipping protrusion are both rhombus-shaped, and the rhombus-shaped first anti-slipping protrusion and the second anti-slipping protrusion further improve the anti-slipping effect.

[0010] As a preferred embodiment of the present invention, a top ring is provided at one end of the connecting sleeve close to the expansion sleeve, and the connecting sleeve squeezes the expansion sleeve through the top ring.

[0011] As a preferred embodiment of the present invention, the outer side of the connecting sleeve is provided with threads, and the provided threads are used for connecting nuts.

[0012] As a preferred embodiment of the present invention, the support head is conical, and the conical support head facilitates the expansion section to be expanded.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The utility model divides the expansion sleeve into a stable section and an expansion section, and uses a support head to expand the expansion section to achieve tightening, and provides a first anti-slip protrusion, a second anti-slip protrusion and anti-slip grooves on the expansion sleeve to improve stability, enhance the tightening effect and reduce the risk of loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the expansion sleeve structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the utility model.

[0018] In the figure: 1. Positioning rod; 101. Support head; 2. Connecting sleeve; 3. Top ring; 4. Expansion sleeve; 412. First anti-slipping protrusion; 401. Stabilizing section; 4011. Second anti-slipping protrusion; 4012. Semicircular groove; 402. Expansion section; 4021. Circular groove; 4022. Connecting groove; 4023. Outward expansion groove; 4024. Expansion sheet. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0021] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0022] See also Figure 1-3 The present invention provides a technical solution: a post-expansion screw anchor bolt comprising a positioning rod 1, a connecting sleeve 2 and an expansion sleeve 4 sleeved outside the positioning rod 1. A support head 101 is provided at the end of the positioning rod 1, and the expansion sleeve 4 is located between the connecting sleeve 2 and the support head 101. The support head 101 is used to expand the expansion sleeve 4.

[0023] Furthermore, the expansion sleeve 4 includes a stabilizing section 401 and an expansion section 402 . The stabilizing section 401 is close to the connecting sleeve 2 , and the expansion section 402 is close to the support head 101 . A plurality of first anti-slip bumps 412 are provided between the stabilizing section 401 and the expansion section 402 .

[0024] Several second anti-slip protrusions 4011 are provided on the side of the stabilizing section 401, and several semicircular grooves 4012 are opened on the top of the stabilizing section 401. Several dividing grooves are opened on the expansion section 402. The expansion section 402 is divided into several expansion pieces 4024 by the several dividing grooves, and each expansion piece 4024 is provided with anti-slip grooves.

[0025] The expansion sleeve 4 is pressed downward by the connecting sleeve 2, so that the expansion piece 4024 of the expansion sleeve 4 is expanded by the support head 101. After expansion, the first anti-slip protrusion 4011, the second anti-slip protrusion 412 and the anti-slip grooves on the expansion piece 4024 are used to improve friction and fastening effects.

[0026] Furthermore, the dividing groove includes a circular groove 4021 , a connecting groove 4022 and an outward expansion groove 4023 which are connected in sequence, and the outward expansion groove 4023 is located at the end of the expansion section 402 .

[0027] The circular groove 4021 is the deformation end of the expansion piece 4024, and then the plurality of expansion pieces 4024 are separated by the connecting groove 4022 and the outward expansion groove 4023 to facilitate the expansion of the expansion piece 4024.

[0028] Furthermore, the first anti-slipping protrusion 4011 and the second anti-slipping protrusion 412 are both diamond-shaped, and the diamond-shaped first anti-slipping protrusion 4011 and the second anti-slipping protrusion 412 further improve the anti-slipping effect.

[0029] Furthermore, a top ring 3 is provided at one end of the connecting sleeve 2 close to the expansion sleeve 4 , and the connecting sleeve 2 squeezes the expansion sleeve 4 through the top ring 3 .

[0030] Furthermore, the outer side of the connecting sleeve 2 is provided with a thread, and the provided thread is used for connecting a nut.

[0031] Furthermore, the support head 101 is conical, and the conical support head 101 facilitates the expansion section 402 to expand.

[0032] To sum up, when using this post-expansion screw anchor, a hole is pre-drilled on the base layer, and then the expansion bolt is inserted into the drilled hole. After the nut is connected to the connecting sleeve 2, the nut is rotated so that the nut pushes the connecting sleeve 2 downward, and the connecting sleeve 2 drives the top ring 3 to squeeze the expansion sleeve 4, so that the expansion sleeve 4 contacts the support head 101. At the same time, the expansion piece 4024 of the expansion sleeve 4 is deformed due to the squeezing of the support head 101, so that the expansion piece 4024 is expanded in the drilled hole, and the anti-slip grooves on the expansion piece 4024 are used to increase friction, and the first anti-slip protrusion 4011 and the second anti-slip protrusion 412 are embedded in the drilled hole, which can effectively improve the fastening effect.

[0033] It is worth noting that the entire device is controlled by a master control button. Since the devices matched with the control button are commonly used devices and belong to existing mature technologies, their electrical connection relationships and specific circuit structures will not be described in detail here.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Post-expansion screw anchor bolt, characterized by: It comprises a positioning rod (1), a connecting sleeve (2) and an expansion sleeve (4) which are sleeved on the outside of the positioning rod (1); a support head (101) is provided at the end of the positioning rod (1); and the expansion sleeve (4) is located between the connecting sleeve (2) and the support head (101); The expansion sleeve (4) comprises a stabilizing section (401) and an expansion section (402), wherein the stabilizing section (401) is close to the connecting sleeve (2), and the expansion section (402) is close to the support head (101), and a plurality of first anti-slip protrusions (412) are provided between the stabilizing section (401) and the expansion section (402); A plurality of second anti-slip bumps (4011) are provided on the side of the stabilizing section (401), and a plurality of semicircular grooves (4012) are provided on the top of the stabilizing section (401); The expansion section (402) is provided with a plurality of dividing grooves, and the expansion section (402) is divided into a plurality of expansion pieces (4024) by the plurality of dividing grooves, and each expansion piece (4024) is provided with an anti-slip pattern.

2. The post-expansion screw anchor according to claim 1, characterized in that: The dividing groove comprises a circular groove (4021), a connecting groove (4022), and an outward-expanding groove (4023) connected in sequence, and the outward-expanding groove (4023) is located at the end of the expansion section (402).

3. The post-expansion screw anchor according to claim 1, characterized in that: The first anti-slip protrusion (412) and the second anti-slip protrusion (4011) are both rhombus-shaped.

4. The post-expansion screw anchor according to claim 1, characterized in that: A top ring (3) is provided at one end of the connecting sleeve (2) close to the expansion sleeve (4).

5. The post-expansion screw anchor according to claim 1, characterized in that: The outer side of the connecting sleeve (2) is provided with a thread.

6. The post-expansion screw anchor according to claim 1, characterized in that: The support head (101) is conical.

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