CN211852437U

CN211852437U - Three-order expansion part drive-in type expansion bolt

Info

Publication number: CN211852437U
Application number: CN202020495935.2U
Authority: CN
Inventors: 林益生
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2020-11-03
Anticipated expiration: 2030-04-08

Abstract

The utility model relates to an expansion bolt, in particular to a three-order expansion part strike-in type expansion bolt, the end of the insertion part of an expansion pipe is provided with a three-order expansion part, the end of the insertion part of the expansion pipe is provided with a notch which is bi-directionally communicated with the wall of the expansion pipe through the axial lead, and the upper wall of the notch is positioned above the three-order expansion part; the three-order expansion part is formed by a first ring narrow part, a second ring narrow part and a third ring narrow part which are recessed from the expansion pipe wall to the expansion pipe from top to bottom, three groups of continuous two half-ring arc surface convex peaks are formed in the pipe, the side walls of gaps positioned in the first ring narrow part, the second ring narrow part and the third ring narrow part are correspondingly and mutually closed, and a first inner pore channel, a second inner pore channel and a third inner pore channel are jointly formed.

Description

Three-order expansion part drive-in type expansion bolt

Technical Field

The utility model relates to an expansion bolt, concretely relates to third-order expansion portion hits formula expansion bolt.

Background

The drive-in expansion bolt utilizes the drive-in nail sleeved in the expansion pipe, under the action of the drive force, the drive-in nail moves along the inner hole channel of the expansion pipe and impacts the expansion part, so that the expansion part expands and deforms towards the inner hole wall of the wall surface hole or other mounting holes, and the expansion part is clamped with the inner hole wall, thereby completing the locking of the expansion pipe and the mutual locking of the mounting holes of the locking surface.

At present, most of driving-in type expansion bolts are provided with a contraction part which contracts towards the inside of a pipe as a stress point on the wall of the expansion pipe, when a driving nail is used for driving the part, the expansion part is difficult to be fully opened effectively after the single contraction part with a smaller range is stressed, and the defect that the clamping force between the expansion part and the inner hole wall is insufficient is easily caused; after the single contraction part with a large range is stressed, a large impact force is needed to strike the driving nail, and the locking surface is easy to crack and break, or the phenomenon that the driving nail is bent due to too large resistance and cannot be smoothly and completely struck is easily caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses drive aim at and provide a formula inflation of hitting of inflation portion on the third order is tied, it can hit the nail and receive to hit and hit the back of beating, and inflation portion on the third order can produce the great expanded structure of expansion range to hit the nail and hit the process simple, hit the power of hitting with the difference and hit the nail back, can carry out the inflation of different degrees according to the interior pore wall place material of difference, for realizing above-mentioned purpose, the utility model provides a following technical scheme: a three-order expansion part drive-in type expansion bolt comprises an expansion pipe and a drive-in nail which are integrally strip-shaped, wherein a blocking part is arranged at the head end of the expansion pipe, a three-order expansion part is arranged at the tail end of an insertion part of the expansion pipe, a notch which is penetrated through the wall of the expansion pipe in a two-way mode through an axial lead is arranged at the tail end of the insertion part of the expansion pipe, and the upper wall of the notch is positioned above the three-order expansion part; the three-order expansion part is formed by a first ring narrow part, a second ring narrow part and a third ring narrow part which are recessed from the expansion pipe wall to the expansion pipe from top to bottom and form three groups of continuous two half-ring arc surface convex peaks in the pipe, the side walls of gaps positioned in the first ring narrow part, the second ring narrow part and the third ring narrow part are correspondingly and mutually closed to form a first inner hole channel, a second inner hole channel and a third inner hole channel, and the first inner hole channel, the second inner hole channel and the third inner hole channel are smaller than the diameter of the driving nail; the length of the driving nail is not shorter than the length from the head end of the expansion pipe to the tail end of the three-step expansion part.

Further, the expansion pipe wall at the lower end of the third ring narrow part is an external expansion lug part.

Preferably, the outer expanding lug part is in a semi-horn arc shape with two mirror images.

Furthermore, the included angle between the outer side wall of the outer expanding lug part and the outer side wall of the expansion pipe is 135-150 degrees.

Further, the radial deviation amplitude of the vertical projection of the outermost periphery of the outer side wall of the insertion part and the vertical projection of the innermost periphery of the outer side wall is within +/-1.5 mm.

Further, the height of the first ring stenosis is 2-5 mm; the height of the second ring narrow part is 2-5 mm; the third ring throat has a height of 2-5 mm.

Preferably, the variation in height of the first, second and third ring throats is 0 to 1 mm.

Preferably, the distance between the upper wall of the gap and the first-step ring throat is 8-15 mm.

Furthermore, the expansion pipe is also provided with a clamping opening, the clamping opening is positioned between the upper wall of the opening and the first-stage ring narrow part, and the clamping opening clamps the driving nail so as to mutually fix the driving nail and the expansion pipe.

Further, the expansion pipe is formed by folding a metal sheet.

Furthermore, a stop piece is arranged at the head end of the expansion pipe.

Furthermore, the stop piece is provided with a convex peak protruding towards the driving end of the driving nail.

Furthermore, the stop piece and the expansion head end are fixed with each other.

Preferably, the inner hole of the stop piece and the stop part are mutually sleeved and fixed

The utility model discloses have following useful part:

1. the head end of the expansion pipe is provided with a stop part, the tail end of the insertion part of the expansion pipe is provided with a three-step expansion part, when a driving nail strikes a first inner pore canal which is formed by a first ring narrow part and a first clamping part correspondingly, the existence of a notch and two half ring arc surface peaks enables the driving nail to reduce the required initial striking force, so that the driving surface of the driving nail slides smoothly along the two half ring arc surface peaks, the first ring narrow part generates outward convex expansion deformation, the first clamping part is opened, the second clamping part and the third clamping part maintain clamping, the opening part of the notch is extended from the upper wall of the notch to extend the upper edge of the second clamping part, the length of the notch is extended, and the driving nail sequentially continues to strike the second inner pore canal and the third inner pore canal inwards, and the required striking force is reduced;

2. the driving nail can be reasonably selected to be driven into the first inner pore canal, the second inner pore canal and the third inner pore canal to form different degrees of expansion according to different materials of the inner pore walls, so that the influence of over expansion on the integral structure of the locking surface can be avoided; when the driving nail is completely driven, the three-order expansion part can generate outward convex expansion deformation, an expansion structure with a larger expansion range can be generated, and a good clamping effect is achieved; in addition, the expansion pipe wall at the lower end of the third ring narrow part is an outer expansion convex part, when the driving nail is completely driven, the outer expansion convex part at the tail end of the expansion pipe can be outwards clamped into the wall surface of the inner hole wall, and the clamping effect of the expansion pipe and the hole channel in the locking surface can be further improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic diagram of an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of an embodiment of the invention;

Detailed Description

The technical solution of the present invention will be described in detail by the following specific examples.

Examples

As shown in fig. 1-2, a three-step expansion part drive-in type expansion bolt is composed of an expansion pipe 1, a drive-in nail 2 and a stop piece 3, wherein: an expansion pipe 1 which is integrally in a cylindrical strip shape is formed by folding a metal sheet, the head end of the expansion pipe 1 is turned over to the outer side wall of the expansion pipe 1 to form two mirror-image semi-horn arc-shaped blocking parts 11, inner holes of blocking pieces 3 of the blocking pieces 3 are sleeved in through insertion parts 10 of the expansion pipe 1, and the inner holes of the blocking pieces 3 and the blocking parts 11 are mutually sleeved and fixed;

the tail end of an insertion part 10 of the expansion pipe 1 is provided with a three-step expansion part 12, the tail end of the insertion part 10 of the expansion pipe 1 is provided with a notch 14 which penetrates through the wall of the expansion pipe 1 in a two-way mode through an axial lead, and the upper wall of the notch 14 is positioned above the three-step expansion part 12; the three-step expansion part 12 is formed by a first ring narrow part, a second ring narrow part and a third ring narrow part (121,122 and 123) which are concave from the top to the bottom from the wall of the expansion pipe 1 to the expansion pipe 1 and form three groups of continuous two half ring arc surface convex peaks 31 in the pipe, the side walls of gaps 14 positioned in the first ring narrow part, the second ring narrow part and the third ring narrow part (121,122 and 123) are correspondingly mutually closed to form a first clamping part, a second clamping part and a third clamping part, so that the first ring narrow part, the second ring narrow part and the third ring narrow part (121,122 and 123) are correspondingly matched with the first clamping part, the second clamping part and the third clamping part to form a first inner pore channel, a second inner pore channel and a third inner pore channel;

the driving nail 2 integrally in a strip shape extends into the expansion pipe 1 through an inner hole of the pipeline, and the length of the driving nail 2 is not shorter than the length from the head end of the expansion pipe 1 to the tail end of the three-step expansion part 12, so that the head of the driving nail 2 can be exposed out of the head end of the expansion pipe 1; the first, second and third inner hole channels (161,162,163) are all smaller than the diameter of the driving nail 2, so when the driving surface of the driving nail 2 sequentially impacts the first, second and third inner hole channels (161,162,163), the driving surface of the driving nail 2 can smoothly slide along the two semi-ring arc surface peaks 31, and the first, second and third ring narrow parts (121,122 and 123) sequentially generate outward convex expansion deformation, so that the first, second and third clamping parts are sequentially opened to form an expansion structure.

In order to further improve the clamping effect of the expansion pipe 1 and the inner hole of the locking surface, the wall of the expansion pipe 1 at the lower end of the third ring narrow part 123 is provided with an outward expansion convex part 13, and when the driving nail 2 is completely driven, the outward expansion convex part 13 at the tail end of the expansion pipe 1 can be outwards clamped in the wall surface of the inner hole, so that the effect is realized.

Preferably, the outward-expanding convex part 13 is in a semi-horn arc shape with two mirror images, in this embodiment, an included angle a between the outer side wall of the outward-expanding convex part 13 and the outer side wall of the expansion pipe 1 is set to be 135 to 150 degrees, by this arrangement, when the outward-expanding convex part 13 is clamped into the wall surface of the inner hole wall, the contact area between the outward-expanding convex part 13 and the wall surface of the inner hole wall can be enlarged, and the outward-expanding convex part 13 is not clamped too deeply into the wall surface of the inner hole wall, so that the cracking and the bursting of the hole wall in the locking surface are caused.

Furthermore, the radial deviation range of the vertical projection of the outermost periphery of the outer side wall of the insertion portion 10 and the vertical projection of the innermost periphery of the outer side wall is within ± 1.5mm, that is, b in fig. 2 is half of the radial deviation range, by this arrangement, the insertion portion 10 can be more smoothly placed into a hard texture installation hole such as a concrete wall hole, without adopting the mode of knocking the expansion pipe 1 or the mode of forming an oversize installation hole, so as to insert the insertion portion 10 into the installation hole.

The present embodiment provides a preferable setting parameter of the third-order expansion part 12, the height X of the first ring slit part 121 is 2-5 mm; the height Y of the second ring throat 122 is 2-5 mm; the height Z of the third ring narrow part 123 is 2-5mm, and the height deviation of the first, second and third ring narrow parts (121,122,123) is 0-1mm, through the arrangement, when a user knocks the driving nail 2, the knocking-in amplitude of the driving nail 2 is relatively easily sensed, so that the knocking-in degree of the driving nail 2 can be selected according to requirements, and excessive driving is avoided; in order to further improve the operation convenience of the user, the following two ways can be adopted for improvement:

firstly, by setting the distance between the upper wall of the notch 14 and the first-stage ring narrow part to be 8-15mm, when the driving nail 2 strikes the first inner pore channel 161, the notch 14 with sufficient length can enable the driving nail 2 to reduce the required initial driving force, so that the driving face of the driving nail 2 slides smoothly along the two semi-ring arc-surface convex peaks 31, the first ring narrow part 121 is enabled to generate outward convex expansion deformation, and the first clamping part is enabled to be opened; in this state, the second and third clamping parts still maintain clamping; namely, the open part of the notch 14 extends from the upper wall of the notch 14 to the upper edge of the second clamping part, so when the driving nail 2 sequentially and continuously hits the second inner pore canal (162,163) inwards, the length of the notch 14 is gradually increased and is extended by at least 2-5mm each time relative to the non-hit state, and the driving force required by reduction can be effectively reduced.

And secondly, a clamping opening 15 can be further formed in the expansion pipe 1, the clamping opening 15 is formed between the upper wall of the notch 14 and the first-stage ring narrow part, the clamping opening 15 clamps the driving nail 2, so that the driving nail 2 and the expansion pipe 1 are fixed with each other, the relative position of the driving nail 2 and the first-stage ring narrow part is controlled, and a user can better grasp the initial state of the driving nail 2, so that the driving force can be better controlled during driving.

In order to protect the outer wall surface of the mounting hole even more effectively, it is preferable that the stopper piece 3 is provided with an annular ridge 31 protruding toward the striking end of the driving nail 2, and by this arrangement, when the driving nail 2 is struck with a hammer, the hammer face collides with the annular ridge 31, and the annular ridge 31 is deformed to be flat, so that a large impact force directly applied to the outer wall surface of the mounting hole by directly striking the stopper piece 3 with the hammer face is partially cancelled.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

Claims

1. The utility model provides a three-order inflation portion hits income formula inflation and ties, is strip expansion pipe (1), hits nail (2) including whole, its characterized in that: the head end of the expansion pipe (1) is provided with a stop part (11), the tail end of an insertion part (10) of the expansion pipe (1) is provided with a three-step expansion part (12), the tail end of the insertion part (10) of the expansion pipe (1) is provided with a notch (14) which penetrates through the wall of the expansion pipe (1) in a two-way mode through an axial lead, and the upper wall of the notch (14) is located above the three-step expansion part (12); the three-step expansion part (12) is formed by a first ring narrow part, a second ring narrow part and a third ring narrow part (121,122 and 123) which are recessed from the wall of the expansion pipe (1) to the expansion pipe (1) from top to bottom and form three groups of continuous two semi-ring arc surface convex peaks (31) in the pipe, the side walls of gaps (14) positioned in the first ring narrow part, the second ring narrow part and the third ring narrow part (121,122 and 123) are correspondingly mutually closed to form a first clamping part, a second clamping part and a third clamping part, so that the first ring narrow part, the second ring narrow part and the third ring narrow part (121,122 and 123) correspondingly form a first inner hole channel, a second inner hole channel and a third inner hole channel with the first clamping part, the second clamping part and the third clamping part, and the first inner hole channel, the second inner hole channel and the third inner hole channel (161,162,163) are all smaller than the diameter of; the length of the driving nail (2) is not shorter than the length from the head end of the expansion pipe (1) to the tail end of the three-step expansion part (12).

2. The three-step expansion portion drive-in expansion bolt of claim 1, characterized in that: the wall of the expansion pipe (1) at the lower end of the third ring narrow part (123) is an external expansion lug part (13).

3. The three-step expansion portion drive-in expansion bolt of claim 2, characterized in that: the included angle between the outer side wall of the outward-expanding convex plate part (13) and the outer side wall of the expansion pipe (1) is 135-150 degrees.

4. The three-step expansion portion drive-in expansion bolt of claim 1, characterized in that: the radial deviation amplitude of the vertical projection of the outermost periphery of the outer side wall of the insertion part (10) and the vertical projection of the innermost periphery of the outer side wall is within +/-1.5 mm.

5. The three-step expansion portion drive-in expansion bolt of claim 1, characterized in that: the height of the first ring throat (121) is 2-5 mm; the height of the second ring throat (122) is 2-5 mm; the third ring throat (123) has a height of 2-5 mm.

6. The three-step expansion portion drive-in expansion bolt of claim 1, characterized in that: the expansion pipe (1) is further provided with a clamping opening (15), the clamping opening (15) is located between the upper wall of the opening (14) and the first-stage ring narrow part, and the clamping opening (15) clamps the driving nail (2) so that the driving nail (2) and the expansion pipe (1) are fixed with each other.

7. The three-step expansion drive-in expansion bolt of any one of claims 1-6, wherein: the expansion pipe (1) is formed by folding a metal sheet.

8. The three-step expansion drive-in expansion bolt of any one of claims 1-6, wherein: the head end of the expansion pipe (1) is provided with a stop piece (3).

9. The three-step expansion portion drive-in expansion bolt of claim 8, characterized in that: the stop piece (3) is provided with a convex peak (31) protruding towards the striking end of the striking nail (2).

10. The three-step expansion portion drive-in expansion bolt of claim 8, characterized in that: the stop piece (3) and the expansion head end are fixed with each other.