CN108868618B

CN108868618B - Cast anchoring drill bit convenient for efficient production

Info

Publication number: CN108868618B
Application number: CN201810879055.2A
Authority: CN
Inventors: 王进海; 张丰霞; 许岩波; 杜景景; 牛翔; 孙晓刚
Original assignee: Luoyang Zhongyan Engineering Material Co ltd
Current assignee: Luoyang Zhongyan Engineering Material Co ltd
Priority date: 2018-08-03
Filing date: 2018-08-03
Publication date: 2023-12-12
Anticipated expiration: 2038-08-03
Also published as: CN108868618A

Abstract

The application belongs to the technical field of rock-soil anchoring. The utility model provides a cast anchor drill bit convenient to high-efficient production, is threaded connection hole and transition blind hole that is the step and arranges including being, be provided with annular boss on the step terminal surface between threaded connection hole and the transition blind hole, the internal diameter phi D of annular boss is greater than or equal to the diameter of transition blind hole. The application avoids the cleaning of the iron beans at the root of the thread, improves the cleaning efficiency of the cast iron beans, and is beneficial to screwing into the design depth when the anchor rod body and the drill bit are screwed in, thereby improving the yield of the cast anchor drill bit and finally achieving the purposes of reducing the production cost and improving the production efficiency.

Description

Cast anchoring drill bit convenient for efficient production

Technical Field

The application belongs to the field of manufacturing of anchor drill bits in the field of rock-soil anchoring, and particularly relates to a cast anchor drill bit convenient for efficient production.

Background

In the existing self-drilling anchor rod system in the rock-soil anchoring field, a large amount of all-steel drill bits are adopted, most of all-steel drill bits adopt a casting production mode in actual production, investment casting mode is commonly adopted in industry, but in the investment casting process, iron beans are easy to generate on a threaded part, particularly on the root of the thread, the iron beans are not easy to polish, the polishing time is long, the yield is low, and the improvement of production efficiency and the cost reduction are not facilitated. And meanwhile, the hollow anchor rod body cannot be screwed into the designed depth when screwed with the hollow anchor rod body, so that the service life of the whole self-drilling anchor rod system is influenced.

Disclosure of Invention

The application aims to solve the problems and the defects, and provides the cast-anchored drill bit which is convenient for high-efficiency production, the structure of the cast-anchored drill bit skillfully avoids the cleaning of iron beans at the root of a thread, the labor force of workers is saved, and the yield of the cast-anchored drill bit is improved.

In order to achieve the above purpose, the technical scheme adopted is as follows:

the utility model provides a cast anchor drill bit convenient to high-efficient production, is threaded connection hole and transition blind hole that the step was arranged including being, be provided with annular boss on the step terminal surface between threaded connection hole and the transition blind hole.

As the preferable technical scheme of the application, the height of the protruding step end face of the annular boss is h, wherein h is more than or equal to 1.5mm.

As a preferable technical scheme of the application, the inner diameter phi D of the annular boss is larger than or equal to the diameter of the transition blind hole.

As the preferable technical scheme of the application, the outer diameter phi D1 of the annular boss is smaller than the minor diameter of the screw thread connecting hole, and the clearance t between the two is more than 2mm.

By adopting the technical scheme, the beneficial effects are that:

the cast-anchored drill bit convenient for high-efficiency production provided by the application avoids the cleaning of iron beans at the root of the thread, improves the cleaning efficiency of the cast iron beans, and is favorable for screwing into the design depth when the anchor body and the drill bit are screwed in, so that the yield of the cast-anchored drill bit is improved, and finally, the purposes of reducing the production cost and improving the production efficiency are achieved.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present application, the following description will briefly explain the drawings of the embodiments of the present application. Wherein the showings are for the purpose of illustrating some embodiments of the application only and not for the purpose of limiting the same.

Fig. 1 shows a schematic structural view of a cast anchor drill bit that facilitates efficient production in accordance with an embodiment of the present application.

Number in the figure:

the transition blind hole is 1, the threaded connection hole is 2, the step end face is 3, and the annular boss is 4.

Detailed Description

In order to make the objects, technical features and technical effects of the technical solution of the present application more clear, an exemplary solution of the embodiment of the present application will be clearly and completely described below with reference to the accompanying drawings of the specific embodiment of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present application fall within the protection scope of the present application.

Referring to fig. 1, the cast anchoring drill bit convenient for efficient production of the embodiment comprises a threaded connection hole 2 and a transition blind hole 1 which are arranged in a step mode, wherein an annular boss 4 is arranged on a step end face 3 between the threaded connection hole 2 and the transition blind hole 1. The thread root stopping surface of the threaded connection hole 2 is flush with the step end surface 3, and the anchor rod body is screwed into the designed depth when touching the annular boss 4 when being screwed into the drill bit.

The height of the annular boss 4 protruding out of the step end face 3 is h, wherein h is more than or equal to 1.5mm.

The inner diameter phi D of the annular boss 4 is larger than or equal to the diameter of the transition blind hole 1.

The outer diameter phi D1 of the annular boss 4 is smaller than the small diameter of the thread of the threaded connecting hole, and the clearance t between the annular boss and the threaded connecting hole is more than 2mm.

In addition, the dimensions of the annular boss 4 have a negligible effect on the weight of the product.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. "connected" or "connected" and the like are not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

While the exemplary embodiments of the present application have been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that various modifications and adaptations can be made to the above-described specific embodiments and that various combinations of the features and structures can be made without departing from the scope of the present application as defined in the appended claims.

Claims

1. The cast anchoring drill bit is characterized in that an annular boss is arranged on the end face of a step between the threaded connecting hole and the transition blind hole, the stop surface of the root part of the thread of the threaded connecting hole is flush with the end face of the step, and the anchor rod body is screwed into the design depth when touching the annular boss when being screwed into the drill bit;

the height of the protruding step end face of the annular boss is h, wherein h is more than or equal to 1.5mm;

the inner diameter phi D of the annular boss is larger than or equal to the diameter of the transition blind hole;

the outer diameter phi D1 of the annular boss is smaller than the small diameter of the thread of the threaded connecting hole, and the clearance t between the annular boss and the threaded connecting hole is more than 2mm.