CN221246180U - Internal thread foreign body cleaning tool - Google Patents

Abstract

The utility model relates to an internal thread foreign matter cleaning tool which comprises a cutting column and a handle which are coaxially arranged, wherein one end of the cutting column is connected with one end of the handle. The cutting column is a column structure with two closed ends and a hollow cavity, and a plurality of cutting edges are formed on the outer wall of the cutting column along the axial direction of the cutting column. The cutting column is provided with a plurality of side holes communicated with the hollow cavity at intervals along the circumferential direction, and the side holes and the hollow cavity form chip flutes. The internal thread foreign matter cleaning tool is simple in structure and low in cost, can be used for removing impurities such as residual glue foreign matters in the threaded holes cleanly, and can avoid risks that scraps and impurities fall into a pipeline.

Description

Internal thread foreign body cleaning tool

Technical Field

The utility model relates to the field of thread cleaning, in particular to a tool for cleaning foreign matter from internal threads.

Background technique

Threaded connection is a common method in the fields of railway brake systems, hydraulic systems, pneumatic cylinders and valves, cooling pipes, etc. When repairing or a fault occurs, the threaded pair needs to be repeatedly disassembled and assembled, and thread deformation often occurs, which directly causes the parts to be scrapped and greatly increases the cost of repair. At present, the commonly used internal thread repair processes in the industry include installing thread sleeves, repair welding, expanding holes and reprocessing. Due to structural and material limitations, the above methods are not suitable for the thread repair of railway brake aluminum cylinders and valves.

In addition, threaded holes are often sealed and prevented from falling off with sealants and fasteners. After the threaded pair is disassembled, glue or other foreign matter will remain in the thread. The repair of the thread also requires cleaning the inner hole to ensure the quality of the threaded hole. The processes for removing foreign matter or residual glue mainly include solvent immersion cleaning, high-pressure blowing, and the use of special tools. However, parts are often cleaned directly on the components without disassembling them. In order to ensure the cleanliness of the pipeline system, only special tools can be used. There are very few special tools for cleaning residual foreign matter in threaded holes. Most of them currently use taps to re-through the holes to remove foreign matter in the threads or use dental probe-type tools to clean foreign matter on the bottom and side surfaces of the threads. The use of tools needs to comprehensively consider factors such as the size and position of the operating space, the risk of foreign matter falling into the pipeline, the protection of the threads, and the cleaning effect.

However, the existing foreign body removal process in threaded holes has the following shortcomings:

(1) There is a high risk of foreign matter falling into the pipeline. When the pipeline has cleanliness requirements for liquids or gases, when using a tap or probe tool to clean the residual glue or debris inside the thread, since the chip groove of the tap is a through groove, it is impossible to seal and protect the bottom of the hole. There is a great possibility that residues and debris will fall into the hole and contaminate the inside of the pipeline. In serious cases, it may cause system failure.

(2) There is a risk of damaging the thread. When cleaning threaded holes made of materials with lower hardness, such as aluminum alloy, copper alloy, and engineering plastics, if the tap is not screwed in vertically, the thread will be cut and damaged when too much force is applied; probe tools may also scratch the thread surface when scraping foreign matter.

(3) Inconvenience in working in small and deep spaces. Some threads are inside equipment or structures, where the space is small and the depth is large. This will inevitably make it difficult to align the hole when using a tap, making it difficult to screw in. If tools such as a twisting rod are used, they cannot be rotated due to space limitations and are inconvenient to remove foreign objects. Probe tools cannot directly visually observe the foreign objects in the hole and cannot be removed.

Utility Model Content

The utility model aims to provide an internal thread foreign body cleaning tool with a simple structure and low cost, which can be used to remove impurities such as residual glue and foreign bodies in threaded holes and avoid the risk of debris and impurities falling into the pipeline.

The purpose of the utility model is achieved in this way. An internal thread foreign body cleaning tool includes a coaxially arranged cutting column and a handle, one end of the cutting column is connected to one end of the handle; the cutting column is a columnar structure with both ends closed and a hollow cavity, and a plurality of cutting edges are formed on the outer wall of the cutting column along its axial direction; a plurality of side holes connected to the hollow cavity are provided on the cutting column at intervals along its circumference, and the plurality of side holes and the hollow cavity constitute a chip groove.

In a preferred embodiment of the present invention, the side hole is a rectangular hole with rounded corners.

In a preferred embodiment of the present invention, the number of the side holes is four and they are evenly spaced and distributed on the cutting column in the circumferential direction.

In a preferred embodiment of the present invention, the length of the side hole along the axial direction of the cutting column is equal to the total length of the plurality of cutting edges along the axial direction of the cutting column.

In a preferred embodiment of the present invention, the cutting column is made of carbon steel or tool steel.

In a preferred embodiment of the present invention, a guide head is coaxially connected to the other end of the cutting column.

In a preferred embodiment of the present invention, the outer wall of the guide head has an external thread, the cross-section of the external thread is trapezoidal, and the outer diameter of the external thread is 0-0.2mm larger than the inner diameter of the internal thread to be cleaned, and the axial length of the guide head is 1-3 times the pitch of the thread on the guide head.

In a preferred embodiment of the present invention, the handle is a cylindrical structure.

In a preferred embodiment of the present invention, anti-slip patterns are provided on the outer surface of the handle.

In a preferred embodiment of the present invention, a connector is coaxially connected to the other end of the handle, and a through hole is formed on the connector, wherein the axis of the through hole is perpendicular to the axis of the handle.

As described above, the cleaning tool in the utility model has a simple structure, a simple manufacturing method and a low cost. When in use, the cutting column of the cleaning tool is manually screwed in and out of the threaded hole to be cleaned, so that impurities such as residual glue and foreign matter in the threaded hole can be removed cleanly, and the operation is convenient. After the cleaning tool scrapes off the residual glue and impurities in the threaded hole, the residual glue and foreign matter in the threaded hole will fall into the relatively closed chip groove and be temporarily stored in the hollow cavity, which will not cause debris to fall into the hole and pollute the system, thereby avoiding the risk of debris and impurities falling into the pipeline.

BRIEF DESCRIPTION OF THE DRAWINGS

The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

Figure 1: A schematic structural diagram of the internal thread foreign body cleaning tool provided by the utility model.

Figure 2: A three-dimensional view of the internal thread foreign body cleaning tool provided by the utility model.

Description of Figure Numbers:

1. cutting column; 11. cutting edge; 12. chip groove; 121. hollow cavity; 122. side hole; S. oblique shovel surface;

2. Handle;

3. Guide head;

4. Connector; 41. Through hole.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

As shown in Figures 1 and 2, this embodiment provides an internal thread foreign body cleaning tool, including a coaxially arranged cutting column 1 and a handle 2, one end of the cutting column 1 is connected to one end of the handle 2; the cutting column 1 is a cylindrical structure with both ends closed and having a hollow cavity 121, and a plurality of cutting edges 11 are formed on the outer wall of the cutting column 1 along its axial direction; a plurality of side holes 122 connected to the hollow cavity 121 are provided on the cutting column 1 along its circumferential interval, and the plurality of side holes 122 and the hollow cavity 121 constitute a chip groove 12.

The cleaning tool in this embodiment has a simple structure, a simple manufacturing method and a low cost. When in use, the cutting column 1 of the cleaning tool is manually screwed in and out of the threaded hole to be cleaned, so that impurities such as residual glue and foreign matter in the threaded hole can be removed cleanly, and the operation is convenient. After the cleaning tool scrapes off the residual glue and impurities in the threaded hole, the residual glue and impurities will fall into the relatively closed chip groove 12 and be temporarily stored in the hollow cavity 121, so that debris will not fall into the hole to pollute the system, thereby avoiding the risk of debris and impurities falling into the pipeline.

In a specific implementation, the side hole 122 is preferably a rectangular hole with rounded corners. In this way, when the side hole 122 intersects with the teeth of the cutting edge 11 on the cutting column 1, an oblique scraping surface S shown in FIG. 2 is formed (specifically, the arc surface formed by the rounded corners of the four corners of the rectangular hole constitutes the oblique scraping surface S), which makes it easier to scrape foreign matter.

The number of side holes 122 can be determined according to actual needs. For example, in this embodiment, the preferred number of side holes 122 is four and they are evenly spaced circumferentially distributed on the cutting column 1. At this time, the entire chip groove 12 is equivalent to two groups of long rectangular holes with rounded corners that penetrate each other vertically, and can be processed by wire cutting or milling. Generally, the length of the chip groove 12 runs through the entire cutting edge 11 (that is, the length of the side hole 122 along the axial direction of the cutting column 1 is equal to the total length of the multiple cutting edges 11 along the axial direction of the cutting column 1), and the width of the chip groove 12 is 1/3 to 1/2 of the major diameter of the tool thread (that is, the width of the side hole 122 is 1/3 to 1/2 of the major diameter of the cutting thread of the cutting edge 11). The chip groove 12 mainly plays the role of storing the residual glue chips cut off, and the cutting edge 11 is formed while processing the chip groove 12.

In practical applications, the tooth profile of the cleaning tool cannot be processed as sharp as a tap, otherwise it is particularly easy to damage the thread when used. The material of the cutting column 1 is preferably carbon steel or tool steel to avoid damage to the threaded hole.

The cutting thread of the cutting edge 11 is processed according to the relevant standards of the tap. Generally, the cutting edge 11 is formed synchronously when processing the chip groove 12, and has a large rake angle (20° to 30°), which can easily scrape the residual glue and foreign matter at the bottom and side of the thread. In addition, the cutting edge 11 adopts a concentric back face, which can reduce the processing difficulty of the tool, increase the contact area with the thread, improve the guiding property of the tool, and play the role of scraping residual glue and foreign matter when screwing in and out of the threaded hole.

Furthermore, a guide head 3 is coaxially connected to the other end of the cutting column 1. Generally, the outer wall of the guide head 3 has an external thread, the cross section of the external thread is trapezoidal, and the outer diameter of the external thread is 0-0.2 mm larger than the inner diameter of the internal thread to be cleaned, and the axial length of the guide head 3 is 1-3 times the pitch of the thread on the guide head 3.

During actual processing, the guide head 3 is the remaining part of the external cutting edge 11 after processing. The length of the guide head 3 is about 1 to 3 times the length of the pitch, and the diameter is slightly larger than the minor diameter of the threaded hole. Generally, the crest of the external thread on the guide head 3 is cut off (making its cross section trapezoidal), and its outer diameter is slightly larger than the minor diameter of the internal thread to be cleaned by about 0.1mm, which can not only play a guiding role, but also further prevent debris and impurities from falling into the pipeline when cleaning the internal thread. The guide head 3 mainly has two functions. First, the guide head 3 has a small diameter, which plays a guiding role when the tool is screwed into the threaded hole, making it easier for the tool to be screwed in; second, it is convenient to form a closed chip groove 12 during processing, and the debris and residue removed from the threaded hole are retained in this position to ensure that they do not fall into the pipeline system.

The outer diameter of the handle 2 is larger than that of the cutting column 1. The handle 2 is a cylindrical structure, and its outer surface is provided with anti-slip patterns, such as surface knurling, which is mainly used for hand-tightening operation to increase friction and facilitate tool rotation.

Furthermore, a connector 4 is coaxially connected to the other end of the handle 2 , and a through hole 41 is formed on the connector 4 , and the axis of the through hole 41 is perpendicular to the axis of the handle 2 .

Generally, the connector 4 is composed of hexagonal and radially arranged through holes 41 (the cross section of the connector 4 along the axial direction is a regular hexagon). When it is impossible to screw into the threaded hole manually or in other special working conditions, a ratchet wrench, a lever, etc. can be used to assist rotation, which makes the operation more convenient.

In summary, the cleaning tool in this embodiment is designed and manufactured using the basic cutting principle of a cutting tap combined with specific usage conditions, and can clean impurities such as residual glue and foreign matter in the thread. The tool is one-piece, and the material can be tool steel, 45# steel, etc., and carbon steel is more preferred. The tool can be divided into five parts according to different functions: a guide head 3, a cutting edge 11, a chip groove 12, a handle 2, and a connector 4. Screwing the tool into the threaded hole can remove the residual glue and foreign matter in the threaded hole, and the residue and debris will not fall into the pipeline system, and the residual glue and foreign matter in the threaded hole can be cleaned and removed efficiently. It has the following advantages:

(1) A tool for removing impurities from threaded holes is developed from scratch. Currently, there are no tools with related or similar functions on the market.

(2) The operating convenience is greatly improved. The tool is extremely convenient for removing residual glue impurities in the internal threads. The impurities can be removed cleanly by manually screwing the tool in and out of the threaded hole.

(3) There is no risk of debris and impurities falling into the pipeline. After the tool scrapes off the residual glue impurities in the thread, they will fall into the closed chip groove 12, and will not cause debris to fall into the hole and pollute the system.

(4) Strong spatial adaptability. The tool has a simple and compact structure, and the front end has a guide that makes it easy to screw into the threaded hole. It can be operated anywhere that the hand can reach, and is basically not restricted by space.

(5) The manufacturing method is simple and the cost is low. Compared with taps, this tool has a wide range of material selection and no special requirements. The material can be selected according to actual needs. In addition, the processing technology is simple and does not require special equipment for processing or heat treatment, so the overall manufacturing cost is low.

The above is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any technician in the field without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims (10)

1. The internal thread foreign matter cleaning tool is characterized by comprising a cutting column and a handle which are coaxially arranged, wherein one end of the cutting column is connected with one end of the handle;

The cutting column is of a column body structure with two closed ends and a hollow cavity, and a plurality of cutting edges are formed on the outer wall of the cutting column along the axial direction of the cutting column; the cutting column is provided with a plurality of side holes communicated with the hollow cavity at intervals along the circumferential direction of the cutting column, and the side holes and the hollow cavity form chip flutes.

2. The internal thread foreign matter removal tool of claim 1, wherein,

The side holes are rectangular holes with round corners.

3. The internal thread foreign matter removal tool of claim 2, wherein,

The number of the side holes is four, and the side holes are circumferentially and uniformly distributed on the cutting column at intervals.

4. The internal thread foreign matter removal tool of claim 2, wherein,

The length of the side hole along the axial direction of the cutting column is equal to the total length of the plurality of cutting edges along the axial direction of the cutting column.

5. The internal thread foreign matter removal tool of claim 1, wherein,

The cutting column is made of carbon steel or tool steel.

6. The internal thread foreign matter removal tool of claim 1, wherein,

And the other end of the cutting column is coaxially connected with a guide head.

7. The internally threaded foreign matter removal tool of claim 6,

The outer wall of the guide head is provided with an external thread, the cross section of the external thread is trapezoidal, the outer diameter of the external thread is 0-0.2mm larger than the inner diameter of the internal thread to be cleaned, and the axial length of the guide head is 1-3 times of the screw pitch of the screw thread on the guide head.

8. The internal thread foreign matter removal tool of claim 1, wherein,

The handle is of a cylindrical structure.

9. The internal thread foreign matter removal tool of claim 1, wherein,

The outer surface of the handle is provided with anti-skid patterns.

10. The internal thread foreign matter removal tool of claim 1, wherein,

The other end of the handle is coaxially connected with a connector, a through hole is formed in the connector, and the axis of the through hole is perpendicular to the axis of the handle.