CN219345208U

CN219345208U - Close-fitting bolt for blind hole

Info

Publication number: CN219345208U
Application number: CN202222856680.XU
Authority: CN
Inventors: 陈涛
Original assignee: SHANGHAI BENAN INDUSTRIAL DEVELOPMENT CO LTD
Current assignee: SHANGHAI BENAN INDUSTRIAL DEVELOPMENT CO LTD
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-07-14
Anticipated expiration: 2032-10-28

Abstract

The utility model provides a close-fitting bolt for a blind hole screw hole, which comprises a stud bolt, a taper shaft core, a nut cover plate, a locking gasket and a cover plate screw, wherein the stud bolt is arranged on the taper shaft core; the threaded stud is sleeved on the taper shaft core and screwed into the blind hole screw hole, and the nut is screwed on one side of the threaded stud head; the screw sequentially passes through the locking gasket, the nut cover plate, the nut and the stud bolt to be screwed on the taper shaft core for fixation. The utility model has reasonable structure and scientific working mode, and solves the technical problem that the conventional hydraulic close-fit bolt is not suitable for a blind hole bolt hole coupler.

Description

Close-fitting bolt for blind hole

Technical Field

The utility model relates to the field of fasteners, in particular to a close-fitting bolt for blind holes.

Background

Patent name: a hydraulic close-fitting bolt system patent (2022202274843) of the type used in couplings having through-holes in the bolt holes. However, when the bolt hole is a blind hole, the taper surface cannot be separated by pulling the bolt from the taper large end; the method for disassembling the conical surface injected with high-pressure oil also has the problem of success rate, and the oil injection method is unsuccessful and can only be broken and disassembled, so that the overhaul period is seriously influenced.

In view of this, we propose a close-fitting bolt for blind holes.

Disclosure of Invention

In order to solve the technical problems, the utility model discloses a close-fit bolt for blind holes, and the technical scheme of the utility model is implemented as follows:

a close-fitting bolt for a hole screw hole comprises a stud bolt, a taper shaft core, a nut cover plate, a cover plate screw and a locking gasket;

the double-headed bolt is sleeved on the taper shaft core and screwed into the blind hole screw hole; the nut is screwed on one side of the stud head; the screw sequentially passes through the locking gasket, the nut cover plate, the nut and the stud bolt to be screwed on the taper shaft core for fixation.

Preferably, the stud bolt is of a hollow structure, external threads are arranged on the outer sides of two ends, and an external cylindrical surface is arranged in the middle; the inner side of the stud is provided with a conical internal thread at one end, an inner conical surface is arranged in the middle of the stud, and the small taper end faces the conical internal thread.

Preferably, the stud bolt is provided with a through groove in the inner conical surface along the axial direction.

Preferably, the tapered mandrel is provided with an outer conical surface which is the same as the taper of the inner conical surface.

Preferably, the taper small end of the taper shaft core is provided with a taper internal thread and a screw hole.

The nut comprises a step hole and a pin hole;

preferably, the nut cover plate comprises a step shaft, a stop pin and a taper hole;

the step shaft and the stop pin are simultaneously inserted into the step hole and the pin hole;

the locking gasket is positioned in the taper hole.

By implementing the technical scheme of the utility model, the technical problem that the hydraulic close-fit bolts are not suitable for the blind hole bolt hole couplings in the prior art can be solved; the close-fitting stud provided by the utility model has the advantages of simple and reasonable structure, convenience in operation, long service life, reusability, low cost and high efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only one embodiment of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.

FIG. 1 is a schematic diagram of the assembly of a blind hole close-fitting bolt;

FIG. 2 is a schematic view of a stud structure;

FIG. 3 is a schematic view of a tapered mandrel;

FIG. 4 is a schematic view of a nut structure;

FIG. 5 is a schematic view of a nut cover plate structure;

FIG. 6 is a schematic view of a locking spacer configuration;

in the above drawings, each reference numeral indicates:

1. stud bolt

1 a-first external thread, 1 b-external cylindrical surface, 1 c-second external thread, 1 d-conical internal thread, 1 e-conical internal surface, 1 f-through slot

2. Taper shaft core

2 a-conical internal thread, 2 b-screw hole, 2 c-external conical surface

3. Nut

3 a-internal thread, 3 b-stepped bore, 3 c-pin bore

4. Nut cover plate

4 a-conical hole, 4 b-through hole, 4 c-stop hole, 4 d-step shaft, 4 e-stop pin

5. Cover plate screw

6. Locking gasket

6 a-through holes, 6 b-lugs, 6 c-bending lugs in use

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Examples

In a specific embodiment, as shown in fig. 1, 2 and 3, a close-fitting bolt for blind holes comprises a stud bolt 1, a taper shaft core 2, a nut 3, a nut cover plate 4, a cover plate screw 5 and a locking gasket 6;

the stud 1 is sleeved on the taper shaft core 2 and screwed into a hole of the blind hole screw, and the nut 3 is screwed on one side of the sleeved head of the stud 1; the cover plate screw 5 sequentially passes through the locking gasket 6, the nut cover plate 4, the nut 3 and the stud bolt 1, and finally is screwed on the taper shaft core 2.

The nut cover plate 4 has the effect of dust prevention and air blowing prevention.

In a preferred embodiment, the stud bolt 1 is of a hollow structure, two ends are respectively provided with a first external thread 1a and a second external thread 1c, and the middle is provided with an external cylindrical surface 1b; one end of the inner side of the stud bolt 1 is provided with a conical internal thread 1d, the middle is provided with an internal conical surface 1e, and the small taper end faces the conical internal thread 1d.

In a preferred embodiment, the stud bolt 1 is provided with through grooves 1f in the section of the outer cylindrical surface 1b along the axial direction, the number of the through grooves 1e is 4, and the through grooves 1e enable the outer cylindrical surface 1b of the stud bolt 1 to be discontinuous in the radial direction, so that the stud bolt is easier to expand and the tight fit effect is better.

In a preferred embodiment, the tapered mandrel 2 is mainly conical, and the taper of its outer conical surface 2c is the same as that of the inner conical surface 1 e.

In a preferred embodiment, the taper small end of the taper shaft core 2 is provided with a taper internal thread 2a and a screw hole 2b; the internal taper thread 2a is used for externally connecting a force application structure, and the screw hole 2b is used for installing a cover plate screw 5.

In a preferred embodiment, the nut 3 is screwed onto the first external thread 1, provided with an internal thread 3a, a stepped hole 3b, a pin hole 3c.

In a preferred embodiment, the nut cover 4 is provided with a conical bore 4a, a through bore 4b, a stop bore 4c, a stepped shaft 4d, a stop pin 4e.

In a preferred embodiment, the number of lugs 6b of the tightening washer 6 is 3, one lug 6b being bent towards the nut cover plate 4 and inserted into the stop hole 4c, the remaining two lugs 6b being bent in opposite directions, holding the screw head of the cover plate screw 5;

the step shaft 4d and the stopper pin 4e are inserted into the step hole 3b and the pin hole 3c at the same time; the locking washer 6 is located in the tapered bore 4 a.

During installation, the stud 1 is sleeved on the taper shaft core 2, the second external thread 1c is screwed on the internal thread of the blind hole bolt hole, the taper shaft core 2 is pulled from the taper small end by a stretcher, and the external cylindrical surface 1b of the stud 1 is forced to expand due to the taper effect, so that the clearance fit between the stud 1 and the blind hole bolt hole is changed into interference fit, and the tight fit effect is achieved; installing a nut 3 and pre-tightening; then installing a nut cover plate 4, and finally fixing the nut cover plate 4 by using a cover plate screw 5; the locking washer 6 can prevent the whole set of screw bolt system from loosening and rotating due to vibration.

When the nut is disassembled, the cover plate screw 5, the locking gasket 6 and the nut cover plate 4 are firstly disassembled, then the pretension of the nut 3 is released by the stretcher, the taper shaft core 2 is pushed to the taper large end by the stretcher, so that the taper surfaces are separated, and the stud 1 and the taper shaft core 2 recover initial clearance fit at the moment and can be easily taken out.

In summary, during installation, the clearance fit between the stud 1 and the blind hole bolt hole is changed into interference fit, so that the tight fit effect is achieved; when the novel double-end bolt is disassembled, the original clearance fit between the double-end bolt 1 and the blind hole bolt hole is restored, the novel double-end bolt can be easily taken out, the harmful conditions such as jamming and seizure are avoided, and the installation process is optimized.

The utility model has reasonable structure and scientific working mode, and solves the technical problems that the hydraulic close-fit bolt is not suitable for a blind hole bolt hole coupler in the prior art.

It should be noted that the above-mentioned embodiments are only preferred embodiments of the present utility model, and are not intended to limit the present utility model, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The close-fitting bolt for the blind hole screw hole is characterized by comprising a stud bolt, a taper shaft core, a nut cover plate, a locking gasket and a cover plate screw;

the threaded stud is sleeved on the taper shaft core and screwed into the blind hole screw hole, and the nut is screwed on one side of the threaded stud head; the screw sequentially passes through the locking gasket, the nut cover plate, the nut and the stud bolt to be screwed on the taper shaft core for fixation.

2. The close-fitting bolt for a blind hole screw hole according to claim 1, wherein said nut cover plate comprises a stepped shaft, a stopper pin and a taper hole;

the nut comprises a step hole and a pin hole;

the locking gasket is positioned in the taper hole.

3. The close-fitting bolt for blind hole screw holes according to claim 2, wherein the stud bolt is of a hollow structure, external threads are arranged on the outer sides of two ends, and an external cylindrical surface is arranged in the middle; the inner side of the stud is provided with a conical internal thread at one end, an inner conical surface is arranged in the middle of the stud, and the small taper end faces the conical internal thread.

4. A blind hole screw hole tightening bolt according to claim 3, wherein said stud bolt is provided with a through groove in the axial direction of said inner conical surface.

5. A blind hole screw hole close-fitting bolt according to claim 4, wherein said tapered mandrel has an outer conical surface of the same taper as said inner conical surface.

6. The close-fitting bolt for blind hole screw holes according to claim 5, wherein the taper end of the taper shaft core is provided with a taper internal thread and a screw hole.