CN219012557U

CN219012557U - Retractable fishing spear

Info

Publication number: CN219012557U
Application number: CN202223499921.6U
Authority: CN
Inventors: 骆建诗; 吴闻涛; 陈广胜; 樊小鹏; 吴佳林
Original assignee: Cnnc East China Geology And Mineral Technology Co ltd
Current assignee: Cnnc East China Geology And Mineral Technology Co ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-05-12
Anticipated expiration: 2032-12-27

Abstract

The utility model discloses a retractable spear which comprises a reducing joint, a cutter body and a guide head, wherein a first thread and a second thread are respectively arranged at two ends of the cutter body, a third thread is arranged at one end of the reducing joint, the reducing joint is in threaded connection with the cutter body through the first thread and the second thread, a fourth thread is arranged at one end of the guide head, the cutter body is in threaded connection with the guide head through the second thread and the fourth thread, a first spring is arranged in the cutter body, a mandrel is pressed into the cutter body through the first spring, the cutter body is in positioning connection with the mandrel through a cylindrical pin, a cutter body groove is formed in the side wall of the cutter body, and a cutter head is clamped on the cutter body groove through the second spring. The utility model has simple structure and easy processing, and the principle of the utility model is different from other retractable fishing spears, so that the utility model can not slip, and the teeth of the tool bit can bite into the drill rod to achieve better positioning effect.

Description

Retractable fishing spear

Technical Field

The utility model relates to a geological core drilling tool, in particular to a retractable fishing spear.

Background

The N-caliber rope core drilling tool is used for drilling in the geological core drilling construction process, if a drill rod is broken when the drilling is deeper, the drill rod is required to be put into the retractable fishing spear to scoop the accident drill rod in the hole, when the existing fishing spear is used for scooping the accident drill rod, part of the drill rod is easy to break and skid, and when the accident drill rod in the hole is extracted, the accident drill rod is easy to fall off to cause new accidents, so that the difficulty of handling the accidents is increased, and the scrapping of the drilling is possibly caused.

Disclosure of Invention

The utility model aims to solve the technical problems, thereby providing a retractable fishing spear;

in order to solve the technical problems, the utility model provides the following technical scheme:

the utility model provides a retractable fishing spear, which is characterized in that,

including reducing joint, cutter body, direction head, the both ends of cutter body are provided with first screw thread, second screw thread respectively, the one end of reducing joint is provided with the third screw thread, reducing joint with the cutter body warp first screw thread, second screw thread threaded connection, the one end of direction head is provided with the fourth screw thread, the cutter body with the direction head warp second screw thread, fourth screw thread threaded connection, be provided with first spring in the cutter body, the dabber passes through first spring is impressed the inside of cutter body, the cutter body with pass through cylindric lock locating connection between the dabber, the cutter body groove has been seted up to the lateral wall of cutter body, there is the tool bit through the second spring joint on the cutter body groove.

Optionally, a through hole is formed in the reducer union.

Optionally, the through holes are at least arranged in two groups, the through holes are obliquely arranged, and the oblique direction is arranged towards the cutter body.

Optionally, the cross section of the through hole is set to be a circular structure, or the cross section of the through hole is set to be a rectangular structure.

Optionally, the second spring is configured as a ring spring.

The utility model has the beneficial effects that

The utility model has simple structure and easy processing, and the principle of the utility model is different from other retractable fishing spears, so that the utility model can not slip, the teeth of the tool bit can bite into the drill rod to achieve better positioning effect, and the guide head can better reach the required position; if the diameter-changing joint and the cutter body outer diameter are made into the same outer diameter, and the depth of the drill rod is known, the drill rod can be salvaged upwards from the bottom, so that the tensile deformation of the drill rod caused by salvaging the drill rod from the upper part is reduced.

Drawings

Fig. 1 is a cross-sectional view of the structure of the present utility model.

Reference numerals illustrate: the tool comprises a 1-reducer union, a 2-mandrel, a 3-cylindrical pin, a 4-first spring, a 5-tool body, a 6-tool bit, a 7-second spring and an 8-guide head.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. 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

As shown in fig. 1, the present utility model provides a retractable spear, characterized in that,

comprises a reducing joint 1, a cutter body 5 and a guide head 8, wherein the two ends of the cutter body 5 are respectively provided with a first thread and a second thread, one end of the reducing joint 1 is provided with a third thread, the reducing joint 1 is in threaded connection with the cutter body 5 through the first thread and the second thread, one end of the guide head 8 is provided with a fourth thread, the cutter body 5 is in threaded connection with the guide head 8 through the second thread and the fourth thread, a first spring 4 is arranged in the cutter body 5, a mandrel 2 is pressed into the cutter body 5 through the first spring 4, the cutter body 5 is in positioning connection with the mandrel 2 through a cylindrical pin 3, a cutter body groove is formed in the side wall of the cutter body 5, a cutter head 6 is clamped on the cutter body groove through a second spring 7,

in the use process, the reducer union 1 is in threaded connection with the cutter body 5 through the first threads and the second threads, the cutter body 5 is in threaded connection with the guide head 8 through the second threads and the fourth threads, the mandrel 2 is pressed into the cutter body 5 through the first spring 4, the cutter body 5 is in positioning connection with the mandrel 2 through the cylindrical pin 3, and finally the cutter head 6 is clamped on a cutter body groove through the second spring 7, wherein the second spring is set to be an annular spring; the reducing joint 1 is provided with at least two groups of through holes, the through holes are obliquely arranged, the oblique direction is towards the direction of the cutter body 5, the cross section of the through holes is of a circular structure, or the cross section of the through holes is of a rectangular structure, in the embodiment, the cross section of the through holes is of a circular structure, but the through holes are not limited to the circular structure and can be arranged according to actual requirements;

according to the utility model, the drill rod is rotated, water is injected and pressurized to push the mandrel 2 to displace, so that the tool bit 6 is slowly opened and cuts the drill rod, the water discharged from the through hole on the reducer union 1 can wash rock powder, when the pressure gauge suddenly releases pressure, the reverse rotation drill rod can start to lift out, when the pressure gauge cannot lift out, only water is introduced and pressurized, the forward rotation drill rod is pressurized, then the pressure release is realized, and the fishing spear can be withdrawn due to the pull-back of the first spring 4 and the second spring;

the utility model has simple structure and easy processing, and because the principle is different from other retractable fishing spears, the retractable fishing spear can not slip, the teeth of the tool bit 6 can bite into the drill rod to achieve better positioning effect, and the guide head 8 can enable the retractable fishing spear to better reach the required position; if the outer diameters of the reducer union 1 and the cutter body 5 are made to be the same outer diameter, and the depth of the drill rod is known, the drill rod can be salvaged upwards from the bottom, so that the tensile deformation of the drill rod caused by salvaging the drill rod from the upper part is reduced.

Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present utility model, and although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present utility model.

Claims

1. A retractable fishing spear is characterized in that,

2. A retractable spear as claimed in claim 1 wherein,

and the reducing joint is provided with a through hole.

3. A retractable spear as claimed in claim 2 wherein,

the through holes are at least arranged in two groups, the through holes are obliquely arranged, and the oblique direction is towards the direction of the cutter body.

4. A retractable spear as claimed in claim 3 wherein,

the cross section of the through hole is set to be of a round structure, or the cross section of the through hole is set to be of a rectangular structure.

5. A retractable spear as claimed in claim 1 wherein,

the second spring is arranged as a ring spring.