CN115111244A

CN115111244A - Expansion bolt

Info

Publication number: CN115111244A
Application number: CN202210863302.6A
Authority: CN
Inventors: 张飞舟; 吴奕卯; 马硕; 付斌; 侯昭军; 聂辰昊; 王延伸; 张赫; 邢仁杰; 李超; 赵政
Original assignee: State Grid Corp of China SGCC; State Grid Hebei Electric Power Co Ltd; Hebei Power Transmission and Transformation Co Ltd
Current assignee: State Grid Corp of China SGCC; State Grid Hebei Electric Power Co Ltd; Hebei Power Transmission and Transformation Co Ltd
Priority date: 2022-07-22
Filing date: 2022-07-22
Publication date: 2022-09-27

Abstract

The invention discloses an expansion bolt, which belongs to the technical field of expansion bolts and comprises a screw rod, wherein the tail part of the screw rod is provided with a conical end, an expansion sleeve is arranged outside the screw rod, the other end of the screw rod is provided with a nut matched with the screw rod for use, the expansion bolt also comprises a wedge block, the conical end is internally provided with a slotted hole from the top part, the conical end is provided with expansion openings which are divided into four parts, the expansion openings are communicated with the slotted hole, and the wedge block is matched with the slotted hole. This application expansion bolts can avoid the screw rod phenomenon of sliding buckle to appear, and the expansion screws then turns the phenomenon, and it is shallow to have solved current expansion bolts anchor section, easily takes off insecure problem, has improved expansion bolts's fixed strength greatly.

Description

Expansion bolt

Technical Field

The invention belongs to the technical field of expansion bolts, and particularly relates to an expansion bolt with a fixed end.

Background

Expansion bolts are common connecting equipment and are widely applied to the industries of construction, industrial, mining, civil engineering and machining. The existing expansion bolt consists of a bolt, an expansion pipe sleeved outside a bolt rod and a nut at the end part of the bolt rod, wherein the tail part of the bolt is conical, the device is easy to process and low in cost, can meet the requirements of most application industries, and is a mature expansion bolt design. When in use, a hole with corresponding size is drilled on the fixed body by an impact electric drill, then a bolt and an expansion pipe are arranged in the hole, and a nut is screwed; an expansion pipe which is slightly larger than the diameter of the bolt is sleeved outside the bolt, after the bolt is screwed down, the tail cone part of the bolt is brought into the pipe with the opening, the pipe is expanded to achieve the purpose of expansion, and then the bolt is fixed on the ground or the wall. In the process, as the nut is screwed, although the caudal vertebra part of the bolt and the expansion pipe are relatively displaced, the expansion pipe is branched and expanded in the hole, and is expanded and combined with the bolt cone and the fixing body into a whole. However, the expansion contact surface of the expansion bolt and the body of the containing material is only a cylindrical surface with a small height at the tail part of the expansion bolt. When an object is fastened by the expansion bolt, the tensile force borne by the screw is equal to the axial component of the containing material body to the tangential positive pressure of the tail cone of the screw, the component force is increased to multiply the positive pressure, the material of the bolt containing material body in common use is poor, the material body cannot bear the expansion force generated by the bolt, the nut of the expansion bolt cannot be screwed enough, and the over-screwing effect is opposite. Therefore, in practical use, the conventional expansion bolt is mostly used under the condition that the fastening force of the object is not high, because it cannot bear the large axial tension load applied to the object.

Furthermore, a multi-stage expansion bolt is invented, namely, the existing expansion pipes are increased into multiple stages, such as CN2337339Y, a conical sleeve is arranged between each stage of expansion pipes, the conical angle of the conical sleeve is the same as that of a screw with an inverted conical head, the outer diameter of the conical sleeve is the same as that of the screw with the inverted conical head, and the nominal size of the inner diameter of the conical sleeve is the same as that of the screw.

For example, CN2292933Y, a multi-stage expansion bolt, which comprises a cone screw, a split sleeve, a cone expansion ring, a split sleeve, a collar, a washer, a spring washer and a hexagon nut, wherein the multi-stage expansion bolt extends into the middle and tail section of a hole of a concrete body or a rigid material body, and as the nut is screwed down, the cone screw, the split sleeve, the cone expansion ring and the split sleeve can generate two or more expansion joint surfaces with the surrounding contained material body, and expand and joint with the bolt contained material body into a whole.

The expansion bolt is pre-fastened by a host machine, as CN112324775A, and comprises a screw, an expansion sleeve and a nut, wherein the expansion sleeve is arranged outside the screw, the front end of the expansion sleeve is flush with the front end of the screw, the nut is connected with the rear end of the screw, a plurality of conical bosses are arranged on the screw, the longer radius bottom surface of the most front boss of the screw is back to the nut, the longer radius bottom surfaces of other bosses face to the nut, a plurality of expansion ring openings are arranged on the expansion sleeve, the opening positions of the expansion rings correspond to the bosses on the screw, and a compression sleeve is sleeved outside the screw and positioned between the expansion sleeve and the nut.

The expansion bolt also comprises a Chinese patent CN200810197506.0, and comprises a screw and an expansion pipe, wherein the lower end part of the expansion pipe is provided with an open slot which is divided equally, the screw is provided with an external thread, the lower end part of the screw passes through the expansion pipe, the upper end of the screw is welded with a nut which is positioned above the expansion pipe, the lower end part of the screw is screwed with a lower conical nut which is positioned below the expansion pipe, the small head end of the lower conical nut faces upwards, the outer diameter of the small head end of the lower conical nut is less than or equal to the inner diameter of the expansion pipe, and the outer diameter of the large head end of the lower conical nut is greater than the inner diameter of the expansion pipe.

After the multistage expansion bolts enter the wall body, due to the multistage expansion joints of the screw rods, the expansion bolts and the wall body form multipoint friction expansion contact in the earlier stage, so that pre-fastening and reinforcing fastening are performed step by step in advance, the whole high-strength stable structure can be formed with the wall body when the expansion bolts are fixed, full-drilling anchoring can be realized, the problems that the existing expansion bolts are shallow in anchoring section and easy to be loose are solved, and the fixing strength of the expansion bolts is greatly improved.

However, the expansion bolt has some defects, which are mainly shown in that the working area is small when the installation depth is large, the fixing strength is insufficient, the screw rod has a slip-buckle phenomenon, and the expansion screw rotates along with the screw rod, so that an application product with a large length does not exist, and the practical effect in the aspects of mines, tunnels, anti-slide embankments and the like is poor; in addition, for some concrete bodies, the thickness of the concrete bodies is small, the existing expansion bolts can expand the expansion pipe only by turning out the bolt rod when being fastened, so that the bolt rod in the concrete body is short and unstable in stress, and for some specific occasions, the expansion bolts are not suitable for use when strict requirements are imposed on the drilling depth and the gravity of suspended objects is large.

Therefore, the existing common expansion bolts or multi-stage expansion bolts are not suitable for occasions with higher precision, and a novel expansion bolt is urgently needed, so that the drilling depth of the bolt and the length of the expansion bolt in a concrete body can be accurately realized.

Disclosure of Invention

The invention provides a novel expansion bolt which is simple in structure, convenient to operate, better in fastening performance, free of slipping and free of the phenomenon that an expansion screw rotates along with the expansion bolt.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the utility model provides an expansion bolt, includes the screw rod, and the screw rod afterbody is provided with conical end, and the screw rod outside is provided with expansion sleeve, and the screw rod other end is provided with the nut that cooperatees and use with the screw rod, still includes the voussoir, and conical end is inwards opened by the top has the slotted hole, is provided with the inflation opening of equalling on the conical end, inflation opening and slotted hole communicate with each other, and the voussoir cooperatees with the slotted hole.

The technical scheme of the invention is further improved as follows: the shape of the slotted hole comprises a circle, an ellipse, a square and a special shape.

The technical scheme of the invention is further improved as follows: the shape of the wedge block comprises a circle, an ellipse, a square and an abnormal shape, and the wedge block is matched with the shape of the slotted hole.

The technical scheme of the invention is further improved as follows: the wedge block is provided with a latch, and the slot hole is internally provided with a latch matched with the latch on the wedge block.

The technical scheme of the invention is further improved as follows: the expansion bolt comprises a plurality of stages of expansion sleeves which are sequentially arranged, the expansion sleeve close to the nut is the last stage of expansion sleeve, and the tail part of the multi-stage expansion sleeve in front of the last stage of expansion sleeve is in a conical shape.

The technical scheme of the invention is further improved as follows: the taper of the tail part of the multistage expansion casing pipe is the same as that of the conical end.

The technical scheme of the invention is further improved as follows: the inner diameter of the tail part of the multistage expansion casing is larger than the diameter of the screw.

The technical scheme of the invention is further improved as follows: the number of the multi-stage expansion sleeves is 1-3.

The technical scheme of the invention is further improved as follows: the outer surface of the conical end is provided with threads or knurls.

The technical scheme of the invention is further improved as follows: and a washer is arranged between the nut and the expansion sleeve.

Due to the adoption of the technical scheme, the invention has the technical progress that:

this application can be so that expansion bolts no longer through outwards removing and then fixing when the fastening at communicating notch and the inflation opening that expansion bolts's conical end set up to and supporting voussoir, changed fixed mode in the past. After punching in this application, with expansion sleeve, the packing ring overlaps in proper order on the screw rod, the voussoir is put in notch department, then whole expansion bolt puts into the hole, the screw rod afterbody is strikeed in the later stage, the voussoir dashes into the notch depths of conical end this moment, conical end expands and opens, it is fixed with expansion bolt's head, then hang the object according to actual need, screw up the nut at last, the in-process that the nut was screwed up promotes expansion sleeve forward and then expansion sleeve expands, expansion bolt fastens once more.

When the conical end is used, the conical end is expanded to play a fastening role, so that the situation that the screw is easy to slip and buckle in the conventional expansion bolt and the expansion screw is then turned is avoided; meanwhile, the situation that the bolt rod in the concrete body is short and the stress is unstable due to the fact that the expansion pipe can be expanded only by turning the bolt rod outwards by a part of length of the conventional expansion bolt is avoided. Some walls are thinner sometimes, and the restriction can not punch the excessive depth, and the expansion bolts of this application can punch how deeply according to the needs of in-service use, and then expansion bolts is long in the internal length of concrete, and the guarantee atress guarantees the intensity that needs.

The slotted hole of the conical end can be designed into various shapes, the irregular shape is enough, and the shape of the wedge block is matched with that of the slotted hole.

The latch that sets up on the voussoir and the latch in the slotted hole mutually support, and when putting expansion bolts into the drilling, strike the screw rod after, the voussoir dashes into the slotted hole, and latch on the voussoir and the latch chucking in the slotted hole guarantee that the voussoir can not deviate from, guarantee that conical end expands and the wall body fastens more.

The expansion bolt can be provided with a plurality of stages of expansion sleeves, and the expansion sleeves can be provided with a plurality of fastening points through expansion except for the expansion fastening of the conical end, so that the fastening force of the expansion bolt is ensured, and the safety is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the wedge construction of the present invention;

FIG. 3 is a schematic view of a conical tip of the present invention;

FIG. 4 is a left side view of the circular notch of FIG. 3;

FIG. 5 is a left side view of the oval slot of FIG. 3;

FIG. 6 is a left side view of the square notch of FIG. 3;

FIG. 7 is a schematic view showing a wedge structure in embodiment 2 of the present invention;

FIG. 8 is a schematic cross-sectional view of a wedge and a conical tip in accordance with example 2 of the present invention;

FIG. 9 is a schematic view of an expansion bolt according to embodiment 2 of the present invention;

the expansion sleeve comprises a conical end 1, a conical end 2, an expansion sleeve 3, a nut 4, a screw rod 5, a gasket 6, a wedge block 7, a slotted hole 8 and a multi-stage expansion sleeve.

Detailed Description

The present invention will be described in further detail with reference to the following examples:

in order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1, the expansion bolt comprises a screw rod 4, a conical end 1 is arranged at the tail of the screw rod 4, an expansion sleeve 2 is arranged outside the screw rod 4, a nut 3 matched with the screw rod 4 for use is arranged at the other end of the screw rod 4, the expansion bolt further comprises a wedge block 6, a slotted hole 7 is formed in the conical end 1 from the top inwards, equally-divided expansion openings are formed in the conical end 1, the expansion openings are communicated with the slotted hole 7, and the wedge block 6 is matched with the slotted hole 7.

The shape of the slot 7 and the shape of the wedge 6 can be round, oval, square or irregular, and various shapes are available, and the shape of the slot 7 and the shape of the wedge 6 are matched.

Example 1

As shown in fig. 1-3, the expansion bolt comprises a screw rod 4, a conical end 1 arranged at the tail of the screw rod 4, an expansion sleeve 2 arranged outside the screw rod 4, and a nut 3 matched with the screw rod 4 for use, and also comprises a wedge block 6, wherein the conical end 1 is provided with a slot hole 7 from the top inwards, the conical end 1 is provided with equally-divided expansion openings, the expansion openings are communicated with the slot hole 7, and the wedge block 6 is matched with the slot hole 7.

As shown in fig. 4-6, the shape of the slot 7 and the shape of the wedge 6 may be configured to be circular, oval, square, or irregular, and various shapes are possible, and the shape of the slot 7 and the shape of the wedge 6 are matched.

Example 2

The utility model provides an expansion bolt, includes screw rod 4, and 4 afterbody of screw rod are provided with conical end 1, and the screw rod 4 outside is provided with expansion sleeve 2, and the screw rod 4 other end is provided with the nut 3 that cooperatees and use with screw rod 4, still includes voussoir 6, and conical end 1 is inwards opened by the top has slotted hole 7, is provided with the inflation opening of equalling on the conical end 1, inflation opening and slotted hole 7 communicate with each other, and voussoir 6 and slotted hole 7 cooperate.

Be provided with the latch on the voussoir 6, the inside latch that also sets up of slotted hole 7, the latch that sets up on the voussoir 6 and the latch in the slotted hole 7 are mutually supported, when putting into the drilling to expansion bolts, strikes screw rod 4 back, and voussoir 6 dashes into slotted hole 7, and the latch on the voussoir 6 and the latch chucking in the slotted hole 7 guarantee that the voussoir can not deviate from, guarantee that conical end expands out and the wall body is more fastened.

Example 3

The shape of the slot 7 and the shape of the wedge 6 may be circular, oval, square or irregular, and any number of shapes are possible, as long as the shape of the slot 7 and the shape of the wedge 6 are matched.

The expansion bolt comprises a plurality of stages of expansion sleeves which are sequentially arranged, the expansion sleeve close to the nut 3 is the last stage of expansion sleeve 2, and the tail part of the multi-stage expansion sleeve 8 in front of the last stage of expansion sleeve 2 is in a conical shape.

The multistage expansion sleeve 8 can be provided with a plurality of, 1-3 under general conditions, and the expansion bolt of this application then has a plurality of fastening points, and is more reliable safety.

Example 4

The outer surface of the conical end head 1 is provided with threads or knurls to strengthen friction force and increase fastening force.

The utility model provides an during expansion bolts uses, punch according to actual need, it punches to calculate the hole depth that needs in the wall, then put into multistage expansion sleeve 8 on the screw rod 4 with expansion bolts, can select multistage expansion sleeve 8's number according to the dynamics and the length of needs, expansion sleeve 2 is put on at last, put into slotted hole 7 with voussoir 6, whole expansion bolts puts into the hole, expansion sleeve 2 leaves partly outside the hole, strike the afterbody of screw rod 4 at last, conical end 1 is bloated open fixedly this moment, sheathe in washer 5, tighten up nut 3 again, expansion sleeve 2 can be along with 3 internal tightening of nut and then expand to downthehole entering, the installation is accomplished.

In order to increase the fastening force of the conical tip 1, the outer surface is provided with threads or is provided with a rough knurling.

The principle and the implementation of the present invention are explained in the present application by using specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an expansion bolt, includes screw rod (4), and screw rod (4) afterbody is provided with conical end (1), and screw rod (4) outside is provided with expansion sleeve (2), and the screw rod (4) other end is provided with and cooperatees nut (3) that use with screw rod (4), its characterized in that: the wedge block type expansion joint is characterized by further comprising a wedge block (6), a slotted hole (7) is formed in the conical end head (1) from the top to the inside, equally-divided expansion openings are formed in the conical end head (1), the expansion openings are communicated with the slotted hole (7), and the wedge block (6) is matched with the slotted hole (7).

2. An expansion bolt according to claim 1, wherein: the shapes of the slotted holes (7) comprise round, oval, square and special shapes.

3. An expansion bolt according to claim 2, wherein: the shape of the wedge block (6) comprises a circle, an ellipse, a square and a special shape, and is matched with the shape of the slotted hole (7).

4. An expansion bolt according to claim 3, characterized in that: the wedge block (6) is provided with a latch, and the slotted hole (7) is internally provided with a latch matched with the latch on the wedge block (6).

5. An expansion bolt according to any one of claims 1 to 4, wherein: the expansion bolt comprises a plurality of stages of expansion sleeves which are sequentially arranged, the expansion sleeve close to the nut (3) is the last stage of expansion sleeve (2), and the tail part of the multi-stage expansion sleeve (8) in front of the last stage of expansion sleeve (2) is conical.

6. An expansion bolt according to claim 5, wherein: the taper of the tail part of the multistage expansion sleeve (8) is the same as that of the conical end (1), and the end part of the multistage expansion sleeve (8) is provided with equally-divided expansion openings.

7. An expansion bolt according to claim 5, wherein: the inner diameter of the tail part of the multistage expansion sleeve (8) is larger than the diameter of the screw (4).

8. An expansion bolt according to claim 6, wherein: the number of the multistage expansion sleeves (8) is 1-3, the conical end head (1) is provided with quartered expansion openings, and the end part of the multistage expansion sleeve (8) is provided with quartered expansion openings.

9. An expansion bolt according to claim 1, characterized in that: the outer surface of the conical end head (1) is provided with threads or knurls.

10. An expansion bolt according to claim 1, wherein: a washer (5) is arranged between the nut (3) and the expansion sleeve (2).