CN218598560U

CN218598560U - Expansion screw

Info

Publication number: CN218598560U
Application number: CN202222763916.5U
Authority: CN
Inventors: 沈永胜
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-10-19
Filing date: 2022-10-19
Publication date: 2023-03-10
Anticipated expiration: 2032-10-19

Abstract

The utility model discloses an expansion screw, include: the left end of the screw is provided with a conical bulge, the diameter of the conical bulge is sequentially reduced from left to right, and the right end of the screw is provided with a clamping joint; the nut is sleeved on the screw rod in a thread matching manner; the expansion pipe, its cover is located on the screw rod and is located between the protruding and nut of taper, and the expansion pipe is including being left pipe portion and the right pipe portion that the integral type is connected, and left pipe portion is the round platform form, and the diameter of left pipe portion reduces from left to right in proper order, and left pipe portion separates into a plurality of pieces that strut that arrange around the axis of expansion pipe equiangularly through the opening. The utility model discloses ensured the fixed strength of inflation screw in drilling, avoided the in-process of rotating the nut to appear the together pivoted condition of screw rod and nut.

Description

Expansion screw

Technical Field

The utility model relates to a fastener field, concretely relates to expansion screw.

Background

The expansion screw is generally a metal expansion screw, and the expansion screw is fixed by utilizing the wedge-shaped slope to promote expansion to generate friction bond force so as to achieve the fixing effect.

The common installation steps of the expansion screw are that firstly, an electric drill is used for drilling a hole suitable for the expansion screw, then, a kit of the expansion screw is placed into the hole together with a nut, finally, the nut is rotated, so that a screw rod moves outwards, a conical part on the screw rod moves through axial movement of threads, a large positive pressure is formed on the peripheral surface of an expansion pipe, in addition, the angle of a cone is small, and therefore friction self-locking is formed among a wall body, the expansion pipe and the cone, and the fixing effect is achieved. However, during the process of turning the nut, the situation that the screw and the nut rotate together due to the fact that the drill hole is too large can occur, and therefore invalid work is caused.

Simultaneously, the expansion pipe of current expansion screw is cylindrical tubular structure, and the distance that the circular cone part on the screw rod can stretch into in the expansion pipe is longer to make the contact surface of circular cone part on the screw rod and the distraction part on the expansion pipe less, cause the circular cone part can't carry out effectual support to the distraction part, and then the condition that resets appears when the distraction part extrudees the atress owing to the vibration, make the expansion screw in the drilling take place to become flexible, have the potential safety hazard.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an expansion screw, this expansion screw have ensured the fixed strength of expansion screw in drilling, have improved the security of using, and have avoided the screw rod and the nut condition of together rotating appearing at the in-process of rotating the nut, have ensured the validity of work operation.

The utility model provides a technical scheme that above-mentioned problem adopted is:

an expansion screw comprising:

the left end of the screw is provided with a conical bulge, the diameter of the conical bulge is sequentially reduced from left to right, and the right end of the screw is provided with a clamping joint;

the nut is sleeved on the screw rod in a thread matching manner;

the expansion pipe, its cover is located on the screw rod and is located between the protruding and nut of taper, and the expansion pipe is including being left pipe portion and the right pipe portion that the integral type is connected, and left pipe portion is the round platform form, and the diameter of left pipe portion reduces from left to right in proper order, and left pipe portion separates into a plurality of pieces that strut that arrange around the axis of expansion pipe equiangularly through the opening.

Wherein, the bellied maximum diameter of taper is greater than the maximum diameter of left pipe portion, and the bellied minimum diameter of taper is not more than the minimum diameter of left pipe portion.

As a further improvement of the technical scheme, a flat washer and a spring washer are sequentially arranged between the right end of the expansion pipe and the nut from left to right, and the flat washer and the spring washer are sleeved on the screw rod. Through the setting of spring washer, do benefit to and prevent that nut from appearing not hard up on the screw rod, and can play certain buffering guard action during the atress. Meanwhile, the flat washer is favorable for increasing the contact area and dispersing pressure, so that the situation that the nut is crushed on the surface of the connected piece when the nut is screwed down is avoided, and the damage of the spring washer on the surface of the connected piece can be eliminated when the screw is detached.

As above-mentioned technical scheme's further improvement, the right side pipe portion is the round platform form, and the diameter of right side pipe portion from left to right increases in proper order, and the maximum diameter of right side pipe portion is the same with the maximum diameter of left side pipe portion for the side homoenergetic of the left end of expansion pipe and right-hand member supports the wall of drilling, thereby ensures the fixed effect of expansion pipe in the drilling, and the minimum diameter of right side pipe portion is the same with the minimum diameter of left side pipe portion, does benefit to the natural sense that improves junction transition between left side pipe portion and the right side pipe portion, improves the harmonious unified sense of expansion screw molding.

As a further improvement of the technical scheme, the four openings are arranged at equal angles around the central axis of the left pipe part, so that the sizes of the expansion pieces are kept consistent, the difference of contact areas between the expansion pieces and the wall surface of the drilled hole is reduced, the fixing effect of the expansion screw in the drilled hole is improved, and the inner end of the opening is positioned at the joint between the left pipe part and the right pipe part.

As a further improvement of the technical scheme, the clamping head is hexagonal prism-shaped, so that a user can conveniently drive the screw rod to rotate or limit the screw rod to rotate by using a manual tool.

Compared with the prior art, the utility model, have following advantage and effect:

the utility model discloses a structure setting of left pipe portion on the expansion pipe for the cone is protruding to have improved the protruding supporting effect to each piece that struts of cone when strutting each piece, thereby has avoided leading to strutting piece extrusion atress and reset and cause the expansion screw to appear not hard up the condition in wall or subaerial because the vibration, has ensured the fixed strength in the expansion screw drilling, has improved the security that the expansion screw used.

Simultaneously, through the setting of joint on the screw rod, thread damage on the screw rod when having avoided clamping tool centre gripping screw rod, thereby guaranteed the smoothness nature that the nut was taken off from the screw rod after the inflation screw fixation, combine the connection structure between nut and the screw rod, make the user can come the inflation screw fixation in the drilling with the mode of rotating the screw rod under the condition that fixation nut keeps motionless, avoided the screw rod and the same pivoted condition of nut to appear at the in-process of rotating the nut, do benefit to the validity of guarantee work operation.

Drawings

Fig. 1 is a schematic structural view of the expansion screw of the present invention.

Fig. 2 is a schematic cross-sectional view of the internal structure of the expansion screw of the present invention.

Fig. 3 is a schematic structural view of a conventional expansion screw in a use state.

Fig. 4 is a schematic structural view of the expansion screw in use state of the present invention.

The expansion pipe comprises a screw 1, a nut 2, an expansion pipe 3, a left pipe part 31, a right pipe part 32, a conical protrusion 4, a clamping joint 5, an opening 61, a spreading sheet 62, a flat gasket 71, a spring gasket 72, a joint 8, a wall 91 and a drill hole 92.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Referring to fig. 1 and 2, the expansion screw of the present embodiment includes a screw rod 1, a nut 2 and an expansion tube 3, a tapered protrusion 4 is disposed at a left end of the screw rod 1, a diameter of the tapered protrusion 4 decreases sequentially from left to right, a snap joint 5 is disposed at a right end of the screw rod 1, the snap joint 5 is in a hexagonal prism shape, the nut 2 is sleeved on the screw rod 1 in a thread fit manner, the expansion tube 3 is sleeved on the screw rod 1 and is located between the tapered protrusion 4 and the nut 2, the expansion tube 3 includes a left tube portion 31 and a right tube portion 32 that are integrally connected, the left tube portion 31 is in a circular truncated cone shape, a diameter of the left tube portion 31 decreases sequentially from left to right, the left tube portion 31 is divided into a plurality of expanding pieces 62 that are arranged at equal angles around a central axis of the expansion tube 3 through an opening 61, a maximum diameter of the tapered protrusion 4 is greater than a maximum diameter of the left tube portion 31, and a minimum diameter of the protrusion 4 is not greater than a minimum diameter of the left tube portion 31.

The expansion tube 3 of the existing expansion screw is mainly in a cylindrical tubular structure (as shown in a in fig. 3), and when the expansion screw in the drill hole is fixed, the conical protrusions 4 on the screw rod 1 enter the expansion tube 3 for a longer distance, so that the contact area between the spreading sheets 62 and the conical protrusions 4 on the expansion tube 3 is smaller (as shown in b in fig. 3).

The distance that this implementation is novel in the protruding 4 entering expansion pipe 3 of taper on the screw rod 1 receives the restriction of the right-hand member diameter of left pipe portion 31 for protruding 4 of taper also can and prop and open and have great area of contact (as shown in fig. 4 a, b) between the piece 62 when strutting respectively opening piece 62, thereby make protruding 4 of taper can play the supporting role to strutting piece 62, and then prevent to appear not hard up condition owing to strutting piece 62 and reset and cause the interior inflation screw of drilling.

In this embodiment, there are four openings 61, and the four openings 61 are arranged at equal angles around the central axis of the left tube 31, and the inner ends of the openings 61 are located at the joint 8 between the left tube 31 and the right tube 32.

The utility model discloses during the use, in putting into the drilling with the inflation screw, then through spanner centre gripping nut and make the nut be in the static state, rotate the screw rod through the hexagonal sleeve afterwards to make the relative nut of screw rod outwards remove, and remove the in-process at the screw rod and make the taper arch strut respectively gradually and strut the piece, make and strut the piece and support the wall of drilling, and then accomplish the fixed of inflation screw in drilling.

Referring to fig. 2, the right tube part 32 is in the shape of a circular truncated cone, the diameter of the right tube part 32 increases from left to right, the maximum diameter of the right tube part 32 is the same as the maximum diameter of the left tube part 31, and the minimum diameter of the right tube part 32 is the same as the minimum diameter of the left tube part 31.

Referring to fig. 2, a flat washer 71 and a spring washer 72 are sequentially arranged between the right end of the expansion pipe 3 and the nut 2 from left to right, and both the flat washer 71 and the spring washer 72 are sleeved on the screw rod 1.

The above description in this specification is merely illustrative of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. An expansion screw, comprising:

the nut is sleeved on the screw rod in a thread matching manner;

the expansion pipe is sleeved on the screw rod and positioned between the conical bulge and the nut, the expansion pipe comprises a left pipe part and a right pipe part which are integrally connected, the left pipe part is in a circular truncated cone shape, the diameter of the left pipe part is sequentially reduced from left to right, and the left pipe part is divided into a plurality of opening pieces which are distributed around the central axis of the expansion pipe at equal angles through an opening;

wherein, the biggest diameter of toper protruding is greater than the biggest diameter of left pipe portion, and the minimum diameter of toper protruding is not more than the minimum diameter of left pipe portion.

2. The expansion screw of claim 1, wherein: and a flat washer and a spring washer are sequentially arranged between the right end of the expansion pipe and the nut from left to right, and the flat washer and the spring washer are sleeved on the screw rod.

3. The expansion screw of claim 1, wherein: the right tube part is in a round table shape, the diameter of the right tube part is sequentially increased from left to right, the maximum diameter of the right tube part is the same as that of the left tube part, and the minimum diameter of the right tube part is the same as that of the left tube part.

4. Expansion screw according to claim 1, characterized in that: the opening has four, and four openings are arranged around the axis of left pipe portion equiangularly, and open-ended inner is located the junction between left pipe portion and the right pipe portion.

5. Expansion screw according to claim 1, characterized in that: the clamping connector is in a hexagonal prism shape.