CN217713264U

CN217713264U - Undercut crab-bolt suitable for hard material

Info

Publication number: CN217713264U
Application number: CN202221882118.8U
Authority: CN
Inventors: 方宏嘉; 陈黄达; 刘晓辉
Original assignee: Zhejiang Excellent Industries Co ltd
Current assignee: Zhejiang Excellent Industries Co ltd
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2022-11-01
Anticipated expiration: 2032-07-21

Abstract

The utility model relates to a bolt specifically discloses a undercut crab-bolt suitable for hard material. The undercut anchor comprises a main body having a plurality of undercut anchoring formations, one end of the main body is a head part, and the other end of the main body is a drill point part; the main body comprises a screw rod, the screw rod is provided with screw teeth, and the screw teeth are spirally arranged along the axial direction from the drill tip part; the screw comprises a drilling section and a middle section, and the drilling section corresponds to the drill point part; notches are arranged on the screw teeth corresponding to the drilling sections, and sawteeth are formed between every two adjacent notches; the middle section is provided with a supporting convex rib, the supporting convex rib is positioned between two adjacent threads, and the supporting convex rib and the threads are spirally arranged in the same direction; the height of the supporting convex rib is smaller than that of the screw teeth. The undercut crab-bolt set up the sawtooth at the segmentation of creeping into, have fine drilling performance, cooperate the protruding muscle of support simultaneously, guarantee the stability of connecting.

Description

Undercut crab-bolt suitable for hard material

Technical Field

The utility model relates to a bolt, concretely relates to undercut crab-bolt suitable for hard material.

Background

Bolts are a common threaded connection and anchors are one type of bolt commonly used to anchor equipment to a set, hardened concrete substrate. Because the hardness of hardened concrete is higher, and an anchor bolt is usually screwed into a connecting hole of a base material in a self-tapping thread form, the resistance of a conventional screw thread in the screwing process is higher, and the operation difficulty in the use process is higher.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a undercut crab-bolt suitable for hard material, is creeping into the segmentation and sets up the sawtooth, has fine drilling performance, cooperates the protruding muscle of support simultaneously, guarantees the stability of connecting.

In order to solve the technical problem, the utility model provides a technical scheme as follows: the undercut anchor bolt suitable for hard materials comprises a main body, wherein one end of the main body is a head part, and the other end of the main body is a drill point part; the main body comprises a screw, the screw is provided with screw teeth, and the screw teeth are spirally arranged along the axial direction from the drill point part;

the screw comprises a drilling section and a middle section, and the drilling section corresponds to the drill point part; notches are arranged on the corresponding screw threads of the drilling subsection, and sawteeth are formed between every two adjacent notches; the middle section is provided with a supporting convex rib, the supporting convex rib is positioned between two adjacent threads, and the supporting convex rib and the threads are spirally arranged in the same direction; the height of the supporting convex rib is smaller than that of the screw teeth.

When the screw is used, a base hole is firstly processed on a base material, the diameter of the corresponding base hole is selected to be larger than the minor diameter of the screw by 2-4 mm, namely, a certain gap is formed between the wall of the base hole and the screw. At the start of drilling, the serrations on the drill section cut the base hole under impact load and tap the thread. Because the base material hardness is great, the impact load between the screw tooth and the base material is great, and in the drilling subsection tapping process, the screw rod has a small amount of shaking, and the clearance between the base hole and the screw rod leaves enough space for the shaking of the screw rod.

When the middle section is subsequently followed and enters the base hole, the arrangement of the supporting convex ribs can play a supporting role between the screw rod and the wall of the base hole, the gap between the screw rod and the base hole is filled, the rock is avoided after the anchor bolt is installed, and the reliability of connection is ensured.

Preferably, the taper of the saw teeth is 60-90 degrees.

Preferably, the head part is in an outer hexagonal flat head shape.

Preferably, the length of the drilling section is 1/4~1/3 of the length of the screw.

Preferably, the height of the supporting convex rib is 0.2 to 0.3 times of the height of the screw thread.

Preferably, the main body further comprises a cylindrical section, the cylindrical section is located between the screw rod and the head, the small diameter of the screw rod is smaller than the diameter of the cylindrical section, and the large diameter of the screw rod is not smaller than the diameter of the cylindrical section.

Drawings

FIG. 1 is a schematic view of a undercut anchor suitable for use in hard materials according to an embodiment;

FIG. 2 is an elevation view of a shear anchor of the present embodiment adapted for use with hard materials;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

FIG. 4 is an enlarged view of a portion of FIG. 1 at B;

fig. 5 is a partial schematic view of the connection between the cylindrical segment and the middle segment of the undercut anchor suitable for hard materials according to this embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Examples

As shown in fig. 1 and fig. 2, the undercut anchor bolt suitable for hard materials comprises a main body 1, wherein one end of the main body 1 is a head 2, the other end of the main body 1 is a drill tip 3, and the head 2 is of an outer hexagonal flat head shape. The main body 1 comprises a screw, the screw is provided with threads 5, and the threads 5 are spirally arranged along the axial direction from the drill tip part 3.

As shown in fig. 2, the screw comprises a drilling section 11 and an intermediate section 12, the drilling section 11 corresponds to the drill tip 3, the length of the drilling section 11 is 1/4~1/3 of the length of the screw, as shown in fig. 2, the length of the drilling section is marked as S, and the length of the screw is marked as H. As shown in fig. 1 and 4, notches 51 are formed on the screw threads 5 corresponding to the drilling sections 11, and a sawtooth is formed between two adjacent notches 51. The taper of the saw teeth is 60-90 degrees.

As shown in fig. 1-3, the middle section 12 is provided with a support rib 4, the support rib 4 is positioned between two adjacent threads, and the support rib 4 and the threads 5 are spirally arranged in the same direction. As shown in fig. 5, the height of the supporting rib 4 is less than the height of the screw thread 5, specifically, the height of the supporting rib 4 is 0.2 to 0.3 times the height of the screw thread 5, as shown in fig. 5, the height of the supporting rib is denoted as F, and the height of the screw thread is denoted as E.

When the screw is used, a base hole is firstly processed on a base material, the diameter of the corresponding base hole is selected to be larger than the minor diameter of the screw by 2-4 mm, namely, a certain gap is formed between the wall of the base hole and the screw. At the start of drilling, the serrations on the drilling section 11 cut the base hole in the form of impact load and tap the thread. Because the base material hardness is great, the impact load between the thread 5 and the base material is great, and during the tapping process of the drilling section 11, the screw has a small amount of shaking, and the clearance between the base hole and the screw leaves enough space for the shaking of the screw.

When the middle section 12 subsequently follows and enters the base hole, the support ribs 4 can support the screw rod and the wall of the base hole, the gap between the screw rod and the base hole is filled, the rock is avoided after the anchor bolt is installed, and the connection reliability is ensured.

As shown in fig. 2 and 5, further, the main body 1 further includes a cylindrical section 13, the cylindrical section 13 is located between the screw and the head 2, the small diameter of the screw is smaller than the diameter of the cylindrical section 13, and the large diameter of the screw is not smaller than the diameter of the cylindrical section 13.

In summary, the above description is only a preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The undercut anchor bolt suitable for hard materials comprises a main body, wherein one end of the main body is a head part, and the other end of the main body is a drill point part; the main body comprises a screw rod, the screw rod is provided with screw teeth, and the screw teeth are spirally arranged along the axial direction from the drill tip part;

the method is characterized in that:

2. Undercut anchor according to claim 1, characterized in that: the taper of the saw teeth ranges from 60 degrees to 90 degrees.

3. Undercut anchor according to claim 1, characterized in that: the head is in an outer hexagonal flat head shape.

4. Undercut anchor according to claim 1, characterized in that: the length of the drilling section is 1/4~1/3 of the length of the screw.

5. Undercut anchor according to claim 1, characterized in that: the height of the supporting convex rib is 0.2 to 0.3 time of the height of the screw thread.

6. Undercut anchor according to any one of claims 1-5, wherein: the main body further comprises a cylindrical section, the cylindrical section is located between the screw rod and the head, the small diameter of the screw rod is smaller than the diameter of the cylindrical section, and the large diameter of the screw rod is not smaller than the diameter of the cylindrical section.