CN213481226U

CN213481226U - Tool for measuring coaxiality of screw head and screw thread

Info

Publication number: CN213481226U
Application number: CN202022405162.7U
Authority: CN
Inventors: 朱以立; 刘阳; 黄亮; 韦伟
Original assignee: Guizhou Hangrui Science & Technology Co ltd
Current assignee: Guizhou Hangrui Science & Technology Co ltd
Priority date: 2020-10-26
Filing date: 2020-10-26
Publication date: 2021-06-18
Anticipated expiration: 2030-10-26

Abstract

The utility model discloses a measure frock of screwhead and screw thread axiality, include: a measurement mechanism comprising: a first support; the measuring instrument is arranged on the first bracket and is provided with a measuring head; fixture includes: a second support; the clamping piece is rotatably arranged on the second bracket and is used for clamping the rod part of the screw; the tool can solve the problems of low accuracy and low efficiency of the existing method for measuring the coaxiality of the screw head and the screw thread.

Description

Tool for measuring coaxiality of screw head and screw thread

Technical Field

The utility model relates to a measure frock of screwhead and screw thread axiality belongs to screwhead and screw thread axiality and measures technical field.

Background

For screw thread type product parts, the coaxiality of the screw thread and the screw head is an important part of product quality, and the requirements of different application fields and positions on the coaxiality of the screw thread and the screw head of the part are different. Particularly for product parts of threaded fasteners for aerospace, the strength and precision are generally not met, and the requirements of manufacturers on the size and the position degree of threads are strictly controlled in the machining process. The requirement on the tool during measurement is large, and the requirement on the service performance of the tool is also large.

According to the product structure size diagram in the figure 1, a part needing to be measured is a hexagonal screw part, when the product is measured, a V-shaped groove is used for placing the product, and a magnet is used for placing the product on the product for measurement, so that different methods of different personnel can influence the measurement precision during measurement, but the measurement is more inconvenient for the product with small screw diameter and short length, and even the measurement precision cannot be measured at all.

SUMMERY OF THE UTILITY MODEL

Based on the foregoing, the utility model provides a measure frock of screwhead and screw thread axiality to solve the rate of accuracy and the problem of inefficiency that current screwhead and screw thread axiality measuring method exist.

The technical scheme of the utility model is that: a tool for measuring coaxiality of a screw head and a thread, wherein the tool comprises:

a measurement mechanism comprising:

a first support;

the measuring instrument is arranged on the first bracket and is provided with a measuring head;

fixture includes:

a second support;

the clamping piece is rotatably arranged on the second bracket and is used for clamping the rod part of the screw;

the measuring head is in sliding contact with the outer circle surface of the screw head along with the rotation of the screw rod part driven by the clamping piece, so that the coaxiality of the screw head and the screw thread is measured.

In one example, the first bracket includes:

a first base seat, a second base seat and a third base seat,

the first supporting rod is vertically and fixedly arranged on the first base;

the cross rod is arranged on the first support rod;

wherein the measuring instrument is mounted on the cross bar.

In one example, the first support further comprises:

the first sleeve is sleeved on the first support rod, and the end part of the cross rod is fixedly arranged on the first sleeve;

the first locking screw penetrates through the first sleeve wall so as to fix the first sleeve on the first support rod.

In one example, the second bracket includes:

a second base seat is arranged on the base seat,

the second supporting rod is vertically and fixedly arranged on the second base;

wherein, the holder is rotatably arranged on the second support rod.

In one example, the second bracket further comprises:

the second sleeve is sleeved on the second support rod;

the second locking screw penetrates through the second sleeve wall so as to fix the second sleeve on the second support rod;

wherein, the holder rotates and sets up in on the second sleeve.

In one example, a threaded column is arranged on the first sleeve, a threaded hole is arranged on the clamping piece, and the clamping piece is rotatably connected with the threaded column through the threaded hole.

In one example, the clamp comprises:

a first clamping block;

the second clamping block is arranged opposite to the first clamping block, and an accommodating space suitable for accommodating a rod part of a screw is formed between the second clamping block and the first clamping block.

In one example, tooth-shaped protruding blocks are arranged on the opposite clamping wall surfaces of the first clamping block and the second clamping block.

In one example, the measuring instrument is a dial indicator or a dial indicator.

The utility model has the advantages that: when the tool is used for measurement, the rod part of the screw is fixed on the clamping piece, the measuring head of the measuring instrument is in contact with the outer circle surface of the head of the screw, then the clamping piece or the screw is rotated, the measuring head of the measuring instrument gradually slides on the outer circle surface of the head of the screw for a circle, and the coaxiality of the head of the screw and the screw can be obtained from the upper limit value and the lower limit value displayed by the measuring instrument.

The tool structure has the characteristics of simplicity in operation, rapidness in replacement, accuracy in measurement, safety and reliability in use, high strength, durability and the like, and can save tool cost, measurement time and measurement accuracy. The method is used for measuring the requirements of screws and thread parts on thread precision, and is particularly suitable for threaded fastener parts for aerospace. Because this field requires very high of precision to the product screw thread, this frock can get rid of external influence, has higher efficiency and higher precision.

Drawings

FIG. 1 is a schematic structural view of a hexagonal screw part;

FIG. 2 is a schematic structural diagram of a tool for measuring coaxiality of a screw head and a thread;

description of reference numerals:

10 measuring mechanism

11 a first support, 12 a measuring instrument;

111 a first base, 112 a first strut, 113 a cross-bar, 114 a first sleeve, 115 a first locking screw;

20 clamping mechanism

21 a second support, 22 a clamp;

211 a second base, 212 a second strut, 213 a second sleeve, 214 a second locking screw, 215 a threaded post;

221 a first clamping block, 222 a second clamping block, 223 a tooth-shaped projection.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms other than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not to be limited to the specific embodiments disclosed below.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, a tool for measuring coaxiality of a screw head and a thread according to an embodiment of the present invention includes a measuring mechanism 10 and a clamping mechanism 20.

The measuring mechanism 10 is mainly used for measuring coaxiality and comprises a first support 11 and a measuring instrument 12, wherein the measuring instrument 12 is mounted on the first support 11 in a suspended mode, and the measuring instrument 12 is provided with a measuring head. The clamping mechanism 20 is mainly used for clamping the screw so as to detect the coaxiality of the screw in a rotating mode, the clamping mechanism 20 comprises a second support 21 and a clamping piece 22, the clamping piece 22 is rotatably installed on the second support 21, and the clamping piece 22 is used for clamping the rod portion of the screw. During detection, the measuring head is in sliding contact with the outer circle surface of the screw head along with the rotation of the screw rod part driven by the clamping piece 22, so that the coaxiality of the screw head and the screw thread is measured.

Specifically, during measurement, the shaft of the screw is fixed on the clamping member 22, the measuring head of the measuring instrument 12 is in contact with the outer circumferential surface of the screw head, and then the clamping member 22 or the screw is rotated, so that the measuring head of the measuring instrument 12 gradually slides on the outer circumferential surface of the screw head for one circle, and the coaxiality of the screw head and the screw thread can be obtained from the upper limit value and the lower limit value displayed by the measuring instrument 12.

In this embodiment, the measuring instrument 12 may be a dial indicator or a dial indicator, the screw is rotated for one circle to measure, the difference of the readings of the dial indicator is calculated, and the measured value can be directly displayed on the dial indicator. Thus yielding screw head and thread concentricity. The measuring mode is simple and ensures the measuring precision.

Further, the first support 11 includes a first base 111, a first supporting rod 112 and a cross rod 113, the first supporting rod 112 is vertically fixed on the first base 111, the cross rod 113 is disposed on the supporting rod, and the measuring instrument 12 is mounted on the cross rod 113. The structure has the advantages of convenient assembly, low cost and the like.

Further, a first sleeve 114 is disposed at an end of the cross bar 113, and the first sleeve 114 is sleeved on the first support bar 112 and fastened by a first locking screw 115 penetrating through a wall of the first sleeve 114. When the height of the cross bar 113 needs to be changed, the adjustment can be performed by the first sleeve 114 and the first locking screw 115.

Further, the second bracket 21 includes a second base 211 and a second supporting rod 212, the second supporting rod 212 is vertically fixed on the second base 211, and the clamping member 22 is rotatably disposed on the second supporting rod 212. The structure has the advantages of convenient assembly, low cost and the like.

It should be noted that the second base 211 and the first base 111 may be the same base or may be separate and different bases.

Further, a second sleeve 213 is sleeved on the second strut 212 and is fastened by a second locking screw 214 penetrating through the wall of the second sleeve 213. The holding member 22 is rotatably disposed on the second sleeve 213. When the height of the clamping member 22 needs to be changed, the adjustment can be performed through the second sleeve 213 and the second locking screw 214.

Furthermore, a threaded post 215 is disposed on the first sleeve 114, a threaded hole is disposed on the clamping member 22, and the clamping member 22 is rotatably connected to the threaded post 215 through the threaded hole. The thread rotation mode is more stable, and the measuring head is in contact with a part of the outer circular surface, so that the measuring result is more accurate.

Further, the clamping member 22 includes a first clamping block 221 and a second clamping block 222, the second clamping block 222 is disposed opposite to the first clamping block 221, and an accommodating space adapted to accommodate a rod portion of the screw is provided between the second clamping block 222 and the first clamping block 221. The first clamping block 221 and the second clamping block 222 are made of elastic materials to facilitate clamping. During operation, the first clamping block 221 and the second clamping block 222 are slightly broken, and then the rod portion of the screw is inserted into the accommodating space for fixing.

It should be noted that the central axis of the accommodating space should be in the same line with the central axis of the threaded post 215, so that the central axis of the screw is the same as the rotation axis when measuring, so as to improve the accuracy of detection.

Further, the opposite clamping walls of the first clamping block 221 and the second clamping block 222 are provided with tooth-shaped protrusions 223, for example, one tooth-shaped protrusion 223 is provided on the first clamping block 221, and two tooth-shaped protrusions 223 are provided on the second clamping block 222, and the three tooth-shaped protrusions 223 clamp the rod portion of the fixing screw. Preferably, the tooth-like projections 223 are inserted into the thread grooves of the screw during fixing, so as to improve the fixing effect, and also to make the central axis of the screw the same as the rotation axis as much as possible, thereby improving the detection accuracy.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A tool for measuring coaxiality of a screw head and a thread, wherein the tool comprises:

measuring mechanism (10) comprising:

a first bracket (11);

a measuring device (12) which is arranged on the first support (11) and the measuring device (12) has a measuring head;

a clamping mechanism (20) comprising:

a second bracket (21);

the clamping piece (22) is rotatably arranged on the second bracket (21), and the clamping piece (22) is used for clamping the rod part of the screw;

the measuring head is in sliding contact with the outer circle surface of the screw head along with the rotation of the screw rod part driven by the clamping piece (22), so that the coaxiality of the screw head and the screw thread is measured.

2. Tool for measuring the coaxiality of the screw head and the thread according to claim 1, wherein said first bracket (11) comprises:

a first base (111) for supporting a first object,

the first supporting rod (112) is vertically and fixedly arranged on the first base (111);

a cross bar (113) disposed on the first strut (112);

wherein the measuring instrument (12) is mounted on the crossbar (113).

3. A tool for measuring the coaxiality of a screw head and a thread according to claim 2, wherein the first bracket (11) further comprises:

the first sleeve (114) is sleeved on the first support rod (112), and the end part of the cross rod (113) is fixedly arranged on the first sleeve (114);

a first locking screw (115), the first locking screw (115) penetrating the wall of the first sleeve (114) to secure the first sleeve (114) to the first strut (112).

4. A tool for measuring the coaxiality of a screw head and a thread according to claim 3, wherein the second bracket (21) comprises:

a second base (211) for supporting the first base,

the second supporting rod (212) is vertically and fixedly arranged on the second base (211);

wherein the clamping piece (22) is rotatably arranged on the second support rod (212).

5. A tool for measuring the coaxiality of a screw head and a thread according to claim 4, wherein the second bracket (21) further comprises:

the second sleeve (213) is sleeved on the second supporting rod (212);

a second locking screw (214), wherein the second locking screw (214) penetrates through the wall of the second sleeve (213) to fix the second sleeve (213) on the second strut (212);

wherein the clamping piece (22) is rotatably arranged on the second sleeve (213).

6. The tool for measuring coaxiality of the screw head and the thread according to claim 5, wherein a threaded column (215) is arranged on the first sleeve (114), a threaded hole is formed in the clamping piece (22), and the clamping piece (22) is rotatably connected with the threaded column (215) through the threaded hole.

7. Tool for measuring the coaxiality of the screw head and the thread according to claim 1, wherein said clamping member (22) comprises:

a first clamping block (221);

the second clamping block (222) is arranged opposite to the first clamping block (221), and an accommodating space suitable for accommodating a rod part of a screw is formed between the second clamping block (222) and the first clamping block (221).

8. The tool for measuring coaxiality of the screw head and the thread as claimed in claim 7, wherein the first clamping block (221) and the second clamping block (222) are provided with tooth-shaped protruding blocks (223) on opposite clamping wall surfaces.

9. The tool for measuring coaxiality of the screw head and the thread according to claim 1, wherein the measuring instrument (12) is a dial indicator or a dial indicator.