CN211501233U

CN211501233U - Expansion bolt

Info

Publication number: CN211501233U
Application number: CN201921223418.3U
Authority: CN
Inventors: 罗德军; 罗雪荣; 李昱; 陈维克
Original assignee: Jianghan University
Current assignee: Jianghan University
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-09-15
Anticipated expiration: 2029-07-31

Abstract

The utility model discloses an expansion bolt belongs to engineering fastener field. The expansion bolt comprises a screw, a nut, a supporting block, a sleeve and a cone frustum-shaped bulge; the nut, the supporting block, the sleeve and the cone frustum-shaped protrusion are sequentially sleeved outside the screw rod along the axial direction of the screw rod; the screw cap is in threaded connection with the first end of the screw rod, and the first end of the screw rod extends out of the screw cap; the supporting block is fixedly connected with the sleeve, and the length of the supporting block in the radial direction of the sleeve is greater than the diameter of the sleeve; the sleeve is provided with a plurality of strip-shaped through grooves which are arranged along the circumferential direction of the sleeve and extend along the axial direction of the sleeve; the conical boss-shaped protrusion is fixedly connected with the second end of the screw rod, and the diameter of the conical boss-shaped protrusion is gradually reduced from the second end of the screw rod to the first end of the screw rod; the cone frustum-shaped protrusion is provided with a strip-shaped convex block, the strip-shaped convex block extends along the axial direction of the screw rod, and the central line of the strip-shaped convex block coincides with the central line of one strip-shaped through groove in the strip-shaped through grooves. The utility model discloses be convenient for take out expansion bolts.

Description

Expansion bolt

Technical Field

The utility model relates to an engineering fastener field, in particular to expansion bolts.

Background

An expansion bolt is a special threaded connection. The tail of the bolt is provided with a big end, the outer surface of the bolt is sleeved with a round pipe with a diameter slightly larger than that of the bolt, and the tail of the round pipe is provided with a plurality of openings. The expansion bolt is driven into a hole on the ground or the wall surface, the nut on the expansion bolt is screwed by a spanner, the bolt moves outwards, the round tube outside the bolt is kept still, the big end of the tail part of the bolt is driven into the round tube to expand the round tube, and therefore the purpose of expansion is achieved, and the bolt is fixed on the ground or the wall. However, the existing expansion bolt is difficult to remove after being installed, cannot be recycled, and is inconvenient to apply.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an expansion bolt, easy dismounting can recycle. The technical scheme is as follows:

the embodiment of the utility model provides an expansion bolt, including screw rod, nut, supporting shoe, sleeve and cone frustum shape are protruding; the nut, the supporting block, the sleeve and the cone frustum-shaped protrusion are sequentially sleeved outside the screw rod along the axial direction of the screw rod; the screw cap is in threaded connection with the first end of the screw rod, and the first end of the screw rod extends out of the screw cap; the supporting block is fixedly connected with the sleeve, and the length of the supporting block in the radial direction of the sleeve is greater than the diameter of the sleeve; the sleeve is provided with a plurality of strip-shaped through grooves which are arranged along the circumferential direction of the sleeve, and each strip-shaped through groove extends along the axial direction of the sleeve; the conical boss-shaped protrusion is fixedly connected with the second end of the screw rod, and the diameter of the conical boss-shaped protrusion is gradually reduced from the second end of the screw rod to the first end of the screw rod; the cone frustum-shaped protrusion is provided with a strip-shaped protruding block, the strip-shaped protruding block extends along the axial direction of the screw rod, and the central line of the strip-shaped protruding block coincides with the central line of one strip-shaped through groove in the plurality of strip-shaped through grooves.

Optionally, the width of the strip-shaped protrusion gradually decreases from the second end of the screw to the first end of the screw.

Optionally, the inner diameter of the sleeve is 0.5mm to 1mm larger than the outer diameter of the screw.

Optionally, the outer diameter of the sleeve is 0mm to 1mm smaller than the maximum diameter of the frustoconical protrusion.

Optionally, the length of the strip-shaped through groove is greater than or equal to 2/5-3/5 of the length of the sleeve.

Furthermore, one end of the strip-shaped through groove, which is close to the strip-shaped convex block, is provided with a V-shaped notch.

Optionally, the length of the strip-shaped through groove is 2/5-3/5 of the length of the sleeve.

Optionally, the supporting block and the sleeve are of an integrally formed structure.

Optionally, the length of the supporting block in the radial direction of the sleeve is 6mm to 12mm greater than the diameter of the sleeve.

Optionally, a cross-section of the support block perpendicular to the axis of the screw is kidney-shaped.

Optionally, the expansion bolt further comprises a gasket, and the gasket is sleeved outside the screw rod and located between the nut and the support block.

The embodiment of the utility model provides a beneficial effect that technical scheme brought is:

through add the strip lug on the frustum of a cone shape that screw rod one end set up is protruding, the central line of strip lug and the coincidence of the central line that the groove was led to the bar, the strip lug gets into in the V type breach, can avoid the frustum of a cone shape protruding and the sleeve between rotation each other. Meanwhile, the cone frustum-shaped protrusion utilizes the strip-shaped through groove to open the sleeve, so that expansion is realized. When the expansion bolt is disassembled, the conical boss-shaped protrusion can come out of the sleeve to eliminate expansion only by tapping the expansion bolt. And be equipped with the supporting shoe between sleeve and the nut, supporting shoe and sleeve fixed connection to the supporting shoe is greater than the diameter of sleeve in the radial ascending length of sleeve, utilizes the vice to press from both sides tight supporting shoe, can very conveniently take out sleeve and screw rod from the hole together.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural view of an expansion bolt provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a screw rod provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a sleeve according to an embodiment of the present invention;

fig. 4 is a right side view of fig. 3 provided by an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

The embodiment of the utility model provides an expansion bolt. Fig. 1 is a schematic structural view of an expansion bolt provided in an embodiment of the present invention. Referring to fig. 1, the expansion bolt includes a screw 10, a nut 20, a support block 30, a sleeve 40, and a truncated cone-shaped protrusion 50. The nut 20, the supporting block 30, the sleeve 40 and the truncated cone-shaped protrusion 50 are sequentially sleeved outside the screw 10 along the axial direction of the screw 10. The nut 20 is threadedly coupled to a first end of the screw 10, and the first end of the screw 10 protrudes from the nut 20. The supporting block 30 is fixedly connected with the sleeve 40, and the length of the supporting block 30 in the radial direction of the sleeve 40 is larger than the diameter of the sleeve 40. The sleeve 40 is provided with a plurality of strip-shaped through grooves 41, the strip-shaped through grooves 41 are arranged along the circumferential direction of the sleeve 40, and each strip-shaped through groove 41 extends along the axial direction of the sleeve 40. The frustum-shaped protrusion 50 is fixedly connected to the second end of the screw 10, and the diameter of the frustum-shaped protrusion gradually decreases from the second end of the screw 10 to the first end of the screw 10. The cone frustum-shaped protrusion 50 is provided with a strip-shaped convex block 51, the strip-shaped convex block 51 extends along the axial direction of the screw 10, and the central line of the strip-shaped convex block 51 is overlapped with the central line of one strip-shaped through groove 41 in the plurality of strip-shaped through grooves 41.

Optionally, as shown in fig. 1, one end of the strip-shaped through slot 41 close to the strip-shaped protrusion 51 may be provided with a V-shaped notch 42, which is beneficial for the strip-shaped protrusion 51 to enter the strip-shaped through slot 41, and prevents the sleeve 40 and the screw 10 from rotating.

The working principle of the expansion bolt provided by the embodiment of the present invention is briefly described below with reference to fig. 1.

Before the expansion bolt is used, the distance between the nut 20 and the truncated cone-shaped protrusion 50 is relatively long, and the truncated cone-shaped protrusion 50 and the sleeve 40 are respectively sleeved on different areas outside the screw rod 10. Punching a hole with proper aperture and depth at the installation position of the expansion bolt by using an electric hammer, and after the expansion bolt is placed into the hole, keeping the screw rod 10 still, and keeping the cone frustum-shaped protrusion 50 fixedly connected with the screw rod 10 still; the distance between the nut 20 and the cone frustum-shaped protrusion 50 is reduced by screwing the nut 20, the strip-shaped convex block 51 on the cone frustum-shaped protrusion 50 enters the V-shaped notch 42, the sleeve 40 and the screw 40 are prevented from sliding relatively, meanwhile, the cone frustum-shaped protrusion 50 enters the sleeve 40, the strip-shaped through groove 41 on the sleeve 40 is expanded, and the expansion bolt expands to be fixed. If the expansion bolt needs to be detached, or the screw rod 10 is kept still, the nut 20 is unscrewed, the distance between the nut 20 and the cone frustum-shaped protrusion 50 is increased, the expansion bolt is tapped, the cone frustum-shaped protrusion 50 comes out of the sleeve 40, and the sleeve 40 can be retracted to the original shape; at this time, the supporting block 30 is clamped by the vise, and the sleeve 40 fixedly connected to the supporting block 30 and the screw 10 fixedly connected to the nut 20 adjacent to the sleeve 40 can be taken out of the hole together.

The embodiment of the utility model provides a through add the strip lug on the frustum shape that sets up screw rod one end is protruding, the central line of strip lug and the coincidence of the central line that the groove was led to the bar, and during the bar lug got into V type breach, mutual rotation between can avoiding the frustum shape protruding and the sleeve. Meanwhile, the cone frustum-shaped protrusion utilizes the strip-shaped through groove to open the sleeve, so that expansion is realized. When the expansion bolt is disassembled, the conical boss-shaped protrusion can come out of the sleeve to eliminate expansion only by tapping the expansion bolt. And be equipped with the supporting shoe between sleeve and the nut, supporting shoe and sleeve fixed connection to the supporting shoe is greater than the diameter of sleeve in the radial ascending length of sleeve, utilizes the vice to press from both sides tight supporting shoe, can very conveniently take out sleeve and screw rod from the hole together.

Fig. 2 is a schematic structural view of a screw rod provided by the embodiment of the present invention. Referring to fig. 2, alternatively, the width of the bar-shaped protrusion 51 may be gradually decreased from the second end of the screw 10 toward the first end of the screw 10. The more cone frustum-shaped protrusion 50 enters the sleeve 40, the larger the strip through groove 41 on the sleeve 40 is opened, the larger the width of the strip protrusion 51 in the strip through groove 41 is correspondingly enlarged, the strip protrusion 51 can be prevented from shaking in the strip through groove 41, and the cone frustum-shaped protrusion and the sleeve can be stably guided to slide mutually by the strip protrusion 51.

Alternatively, as shown in fig. 2, the angle α between the surface of the truncated cone-shaped protrusion 50 and the axis of the screw 10 may be 20 ° to 40 °. Can play the inflation effect, realize the bolt fastening, also can avoid the sleeve to buckle too deeply and impaired.

Alternatively, the inner diameter of the sleeve 40 may be 0.5mm to 1mm larger than the outer diameter of the screw 10. The inner diameter of the sleeve 40 is slightly larger than the outer diameter of the screw 10, so that friction in the bolt fixing process can be reduced, and meanwhile, the gap between the sleeve and the screw is small, so that expansion fixing of the bolt is facilitated.

Alternatively, the outer diameter of the sleeve 40 may be 0mm to 1mm smaller than the maximum diameter of the truncated cone-shaped protrusion 50. The outer diameter of the sleeve 40 is slightly smaller than the maximum diameter of the truncated cone-shaped protrusion 50, and the bolt fixation stability is good.

Optionally, as shown in FIG. 1, the length a of the strip-shaped through slot 41 may be greater than or equal to 2/5-3/5 of the length b of the sleeve 40. The length a of the strip-shaped through groove 41 is longer, the sleeve is more flexible, the friction force between the sleeve and the hole wall can be reduced, and the expansion bolt can be conveniently taken out from the hole. And the length of the strip-shaped through groove 41 is longer, so that the bending condition of the sleeve can be dispersed, the deformation of the sleeve is reduced, and the shape of the sleeve is easier to recover.

Fig. 3 is a schematic structural view of a sleeve according to an embodiment of the present invention. Referring to fig. 3, the supporting block 30 and the sleeve 40 may be formed as an integral structure, and the expansion bolts may be easily disassembled.

Alternatively, the length of the supporting block 30 in the radial direction of the sleeve 40 may be 6mm to 12mm greater than the diameter of the sleeve 40, and the supporting block may be located outside the mounting hole to facilitate the expansion bolt to be taken out of the mounting hole.

Fig. 4 is a right side view of fig. 3 according to an embodiment of the present invention. Referring to fig. 4, the cross-section of the support block 30 perpendicular to the axis of the screw 10 may be kidney-shaped, i.e. the support block 30 has two surfaces 31 parallel to each other, facilitating the vise to grip the support block 30.

Alternatively, as shown in fig. 1, the supporting block 30 may have a thickness d of 1mm to 3mm, and have a certain strength to ensure smooth removal of the expansion bolt.

Optionally, as shown in fig. 1, the expansion bolt may further include a washer 70, and the washer 70 is disposed outside the screw 10 and between the nut 20 and the supporting block 30 to balance the torque force generated by the screw and protect the supporting block.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. An expansion bolt, characterized in that it comprises a screw (10), a nut (20), a support block (30), a sleeve (40) and a truncated cone-shaped protuberance (50); the nut (20), the supporting block (30), the sleeve (40) and the cone frustum-shaped protrusion (50) are sequentially sleeved outside the screw (10) along the axial direction of the screw (10); the screw cap (20) is in threaded connection with a first end of the screw rod (10), and the first end of the screw rod (10) extends out of the screw cap (20); the supporting block (30) is fixedly connected with the sleeve (40), and the length of the supporting block (30) in the radial direction of the sleeve (40) is larger than the diameter of the sleeve (40); the sleeve (40) is provided with a plurality of strip-shaped through grooves (41), the strip-shaped through grooves (41) are arranged along the circumferential direction of the sleeve (40), and each strip-shaped through groove (41) extends along the axial direction of the sleeve (40); the cone frustum-shaped protrusion (50) is fixedly connected with the second end of the screw rod (10), and the diameter of the cone frustum-shaped protrusion is gradually reduced from the second end of the screw rod (10) to the first end of the screw rod (10); the cone frustum-shaped protrusion (50) is provided with a strip-shaped bump (51), the strip-shaped bump (51) extends along the axial direction of the screw (10), and the central line of the strip-shaped bump (51) is superposed with the central line of one strip-shaped through groove (41) in the plurality of strip-shaped through grooves (41);

the supporting block (30) and the sleeve (40) are of an integrally formed structure, the length of the supporting block (30) in the radial direction of the sleeve (40) is 6-12 mm larger than the diameter of the sleeve (40), and the section of the supporting block (30) perpendicular to the axis of the screw (10) is waist-shaped.

2. Expansion bolt according to claim 1, characterized in that the width of the strip-shaped projection (51) decreases gradually from the second end of the shank (10) in the direction of the first end of the shank (10).

3. Expansion bolt according to claim 1 or 2, characterized in that the inner diameter of the sleeve (40) is 0.5-1 mm larger than the outer diameter of the screw (10).

4. Expansion bolt according to claim 1 or 2, characterized in that the outer diameter of the sleeve (40) is 0-1 mm smaller than the largest diameter of the frustoconical protrusion (50).

5. Expansion bolt according to claim 1 or 2, characterized in that the length of the strip-shaped through slot (41) is greater than or equal to 2/5-3/5 of the length of the sleeve (40).

6. Expansion bolt according to claim 1 or 2, characterized in that the strip-shaped through groove (41) is provided with a V-notch (42) at the end close to the strip-shaped projection (51).

7. Expansion bolt according to claim 1 or 2, characterized in that it further comprises a washer (70), said washer (70) being fitted over said shank (10) and between said nut (20) and said support block (30).