CN219026195U

CN219026195U - Expansion type comb knife for repairing multi-size threads

Info

Publication number: CN219026195U
Application number: CN202223005153.4U
Authority: CN
Inventors: 耿贺辉; 刘强
Original assignee: China Nuclear Power Operation Technology Corp Ltd
Current assignee: China Nuclear Power Operation Technology Corp Ltd
Priority date: 2022-11-11
Filing date: 2022-11-11
Publication date: 2023-05-16
Anticipated expiration: 2032-11-11

Abstract

The utility model relates to the technical field of repairing defects of main bolt holes of reactor pressure vessels, and particularly discloses an expansion type chaser for repairing multi-size threads. The comb knife comprises an expansion control shaft, a chuck, a claw and a blade, wherein the expansion control shaft is fixedly connected with the chuck, an Archimedes spiral groove is formed in the bottom of the chuck, the claw is of a plate-shaped structure and is arranged below the chuck, an Archimedes spiral matched with the bottom of the chuck is formed in the top of the claw, the Archimedes spiral at the top of the claw is embedded into the Archimedes spiral groove at the bottom of the chuck, and the claw moves away from or close to an extension line below a central shaft of the expansion control shaft under the rotation drive of the chuck; and blades are arranged on the lateral outer edges of the clamping jaws so as to repair threads. The comb knife is simple in structure, convenient to operate and extremely high in reliability.

Description

Expansion type comb knife for repairing multi-size threads

Technical Field

The utility model belongs to the technical field of repairing defects of main bolt holes of reactor pressure vessels, and particularly relates to an expansion type chaser for repairing multi-size threads.

Background

Video inspection of the main bolt hole of the reactor pressure vessel is a necessary operation during overhaul, and aims to inspect whether the thread of the main bolt hole has defects or not, thereby affecting normal screwing of the main bolt when closing the cover. When defects are found in the threads of the main bolt holes, the threads need to be repaired. For small defects such as scratches and burrs, tools such as sand paper and assorted files are generally used for repairing the threads, and for large defects, a thread repairing comb is needed for repairing the threads.

Currently, the chasers used for thread repair are mostly fixed, and the structure of the chasers is similar to that of a thread tap. The fixed comb can only repair threads of one specification, and a single comb cannot meet the requirements of repairing threads of different dimensions. In addition, because a gap exists between the tooth bottoms of the comb blades and the tooth tops of the threads when the comb blades work, a single comb blade can only repair the tooth surfaces of the threads and cannot repair the defects on the tooth tops of the threads.

Disclosure of Invention

The utility model aims to solve the technical problems in the prior art, and provides an expansion type comb knife for repairing multi-size threads, which can quickly control the expansion and contraction of a comb knife blade in a rotating mode so as to solve the problem of repairing threads with different sizes, repair tooth surfaces and tooth tops and reduce the damage to the threads in the repairing process.

In order to solve the problems, the technical scheme of the utility model is as follows: the expansion type comb knife comprises an expansion control shaft, a chuck, a claw and a blade, wherein the expansion control shaft is fixedly connected with the chuck, an Archimedes spiral line groove is formed in the bottom of the chuck, the claw is of a plate-shaped structure and is arranged below the chuck, an Archimedes spiral line matched with the bottom of the chuck is formed in the top of the claw, the Archimedes spiral line at the top of the claw is embedded into the Archimedes spiral line groove at the bottom of the chuck, and the claw is driven by the rotation of the chuck to move away from or close to an extension line below a central shaft of the expansion control shaft; and blades are arranged on the lateral outer edges of the clamping jaws so as to repair threads.

The comb knife further comprises a shell, the whole shell is of a hollow columnar structure, the top of the shell is open so that the top of the expansion control shaft extends out of the shell, a knife outlet edge is uniformly formed in the lateral direction of the lower portion of the shell so that a blade extends out of the shell, the bottom of the shell is sealed so that a claw is packaged in the shell, and a positioning groove for the claw to move is formed in the inner side of a cavity at the bottom of the shell.

The top of the shell is tightly pressed on the chuck through the gland, a round hole is formed in the middle of the gland, and the size of the round hole is matched with that of the expansion control shaft so as to keep the expansion control shaft and the chuck to rotate stably.

The number of the clamping claws is six, and the clamping claws are uniformly and circumferentially distributed along the lower extension line of the central shaft of the expansion control shaft.

The blade comprises a crest restoration blade and a tooth surface restoration blade, wherein the outer edge of the crest restoration blade is of a planar structure, and the outer edge of the tooth surface restoration blade is of a tooth-shaped structure.

The number of the crest repairing blades is three, the number of the tooth surface repairing blades is three, and the crest repairing blades and the tooth surface repairing blades are sequentially arranged on six clamping jaws at intervals.

The blade is movably connected with the clamping jaw through a screw, and a set screw is further arranged between the blade and the clamping jaw so as to finely adjust the position of the blade.

And a copper sleeve is arranged between the expansion control shaft and the chuck to support and position the chuck.

The utility model has the remarkable effects that: according to the expansion type comb knife for repairing the multi-size threads, the expansion size of the knife blade is continuously adjusted by rotating the expansion control shaft, so that the comb knife can repair threads with different sizes, and meanwhile, the comb knife blade can repair defects of tooth surfaces and tooth tops. The comb knife is simple in structure, convenient to operate and extremely high in reliability.

Drawings

FIG. 1 is a schematic view of an expansion chaser for multi-size thread repair according to the present disclosure;

FIG. 2 is a bottom view of an expanding comb blade for multi-size thread repair according to the present utility model;

FIG. 3 is a side view of an expanding comb blade for multi-size thread repair according to the present utility model;

in the figure: 1. an expansion control shaft; 2. a gland; 3. a housing; 4. a chuck; 5. a copper sleeve; 6. a claw; 7. a crest restoration blade; 8. a set screw; 9. dental face restoration blades.

Detailed Description

The following description of the embodiments of the present utility model will be made more apparent, and the embodiments described in detail, but not necessarily all, in connection with the accompanying drawings. 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 fall within the scope of the utility model.

In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by "upper" or the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience and simplicity of description, and is not meant to indicate or imply that the apparatus or element to be referred to must be provided with a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "configured," "mounted," "secured," and the like are to be construed broadly and may be either fixedly connected or detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

As shown in fig. 1-3, an expansion type comb blade for multi-size thread repair comprises an expansion control shaft 1, a chuck 4, a claw 6 and a blade, wherein the expansion control shaft 1 is of a columnar structure, the whole longitudinal section of the expansion control shaft is of an inverted T-shaped structure, the expansion control shaft 1 is fixedly connected with the chuck 4 through a screw, and as an embodiment, a copper sleeve 5 is arranged between the expansion control shaft 1 and the chuck 4 so as to support and position the chuck; the chuck 4 rotates under the drive of the expansion control shaft 1, and an Archimedes spiral groove is arranged at the bottom of the chuck 4;

the clamping jaws 6 are of plate-shaped structures, are arranged below the chuck 4, and are uniformly and circumferentially distributed in a radial manner along the lower extension line of the central shaft of the expansion control shaft 1; as an embodiment, the number of the clamping claws 6 is six, each clamping claw is provided with a blade at the lateral outer edge, the blade is movably connected with the clamping claws 6 through a screw, and a set screw 8 is arranged between the blade and the clamping claws 6 so as to finely adjust the position of the blade;

the top of the clamping jaw 6 is provided with an Archimedes spiral line matched with the bottom of the chuck 4, the Archimedes spiral line at the top of the clamping jaw 6 is embedded into an Archimedes spiral line groove at the bottom of the chuck 4, and the clamping jaw 6 moves away from or near to an extension line below the central shaft of the expansion control shaft 1 under the driving of the rotation of the chuck 4;

the blades comprise crest restoration blades 7 and tooth surface restoration blades 9, the outer edges of the crest restoration blades 7 are of planar structures, the outer edges of the tooth surface restoration blades 9 are of tooth-shaped structures, as an embodiment, the number of the crest restoration blades 7 is three, the number of the tooth surface restoration blades 9 is three, and the crest restoration blades 7 and the tooth surface restoration blades 9 are sequentially arranged on six claws 6 at intervals;

the carding tool also comprises a shell 3, wherein the whole shell 3 is of a hollow columnar structure, the top of the shell is open so as to extend the top of the expansion control shaft 1 out of the shell 3, a knife outlet edge is uniformly formed in the lateral direction of the lower part of the shell 3 so that a blade extends out of the shell 3, the bottom of the shell 3 is sealed so as to encapsulate a claw 6 in the shell 3, and a positioning groove for the claw 6 to move is formed in the inner side of a cavity at the bottom of the shell 3; the top of the shell 3 is sealed by a gland 2, a round hole is arranged in the middle of the gland 2, and the size of the round hole is matched with that of the expansion control shaft 1 so as to keep the expansion control shaft 1 and the chuck 4 to rotate stably.

An expansion type chaser for multi-size thread repair is provided, which comprises the following specific operation modes:

step 1: positioning the comb blade to a designated area of the threaded hole to be repaired, wherein the expansion-type comb blade is in a retracted state;

step 2: rotating the expansion control shaft 1 to enable the clamping jaw 6 to move outwards until the tooth-shaped structure on the tooth surface restoration blade 9 is completely meshed with the threads of the main bolt hole, and the tooth crest restoration blade 7 is attached to the tooth crests of the threads;

step 3: clamping the shell 3 through a rotary clamping device to drive the comb to rotate, thereby completing the repair of the thread defects;

step 4: the expansion control shaft 1 is rotated so that the jaws 6 move inwards, retracting the blade.

With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims

1. An expansion chaser for multi-size thread repair, characterized by: the carding tool comprises an expansion control shaft (1), a chuck (4), a claw (6) and a blade, wherein the expansion control shaft (1) is fixedly connected with the chuck (4), an Archimedes spiral groove is formed in the bottom of the chuck (4), the claw (6) is of a plate-shaped structure and is arranged below the chuck (4), an Archimedes spiral matched with the bottom of the chuck (4) is formed in the top of the claw, the Archimedes spiral groove at the top of the claw (6) is embedded into the Archimedes spiral groove at the bottom of the chuck (4), and the claw (6) is driven by the rotation of the chuck (4) to move away from or close to an extension line below the central shaft of the expansion control shaft (1); the lateral outer edge of the clamping jaw (6) is provided with a blade so as to repair the thread.

2. An expanding comb for multi-size thread repair as claimed in claim 1, wherein: the comb knife further comprises a shell (3), wherein the shell (3) is of a hollow columnar structure, the top of the shell is open, so that the top of the expansion control shaft (1) extends out of the shell (3), a knife edge is uniformly formed in the lateral direction of the lower part of the shell (3), so that a blade extends out of the shell (3), the bottom of the shell (3) is sealed, a claw (6) is packaged inside the shell (3), and a positioning groove for the claw (6) to move is formed in the inner side of a cavity at the bottom of the shell (3).

3. An expanding comb for multi-size thread repair as claimed in claim 2, wherein: the top of the shell (3) is tightly pressed against the chuck through the gland (2), a round hole is formed in the middle of the gland (2), and the size of the round hole is matched with that of the expansion control shaft (1) so as to keep the expansion control shaft (1) and the chuck (4) to rotate stably.

4. An expanding comb for multi-size thread repair as claimed in claim 1, wherein: the number of the clamping claws (6) is six, and the clamping claws are uniformly and circumferentially distributed along the lower extension line of the central shaft of the expansion control shaft (1).

5. An expanding comb for multi-size thread repair as claimed in claim 4, wherein: the blade comprises a crest restoration blade (7) and a tooth surface restoration blade (9), wherein the outer edge of the crest restoration blade (7) is of a planar structure, and the outer edge of the tooth surface restoration blade (9) is of a tooth-shaped structure.

6. An expanding comb for multi-size thread repair as claimed in claim 5, wherein: the number of the crest repairing blades (7) is three, the number of the tooth surface repairing blades (9) is three, and the crest repairing blades (7) and the tooth surface repairing blades (9) are sequentially arranged on six clamping jaws (6) at intervals.

7. An expanding comb for multi-size thread repair as claimed in claim 1, wherein: the blade is movably connected with the clamping jaw (6) through a screw, and a set screw (8) is further arranged between the blade and the clamping jaw (6) so as to finely adjust the position of the blade.

8. An expanding comb for multi-size thread repair as claimed in claim 1, wherein: a copper sleeve (5) is arranged between the expansion control shaft (1) and the chuck (4) so as to support and position the chuck.