CN202119375U

CN202119375U - Gauge for symmetry degree of shaft key slot

Info

Publication number: CN202119375U
Application number: CN2011201743817U
Authority: CN
Inventors: 吴永旭; 张永泉; 彭学斌; 姜娟
Original assignee: Shanghai East Pump Group Co Ltd
Current assignee: Shanghai East Pump Group Co Ltd
Priority date: 2011-05-27
Filing date: 2011-05-27
Publication date: 2012-01-18
Anticipated expiration: 2021-05-27

Abstract

The utility model discloses a gauge for symmetry degree of a shaft key slot. The gauge includes a V-shaped block, a gland, a spring and a measuring pin. The V-shaped block is provided with a hole in the center. The measuring pin and the central hole of the V-shaped block are in a small clearance fit, so as to guarantee a shaft can slide freely in an axial direction. Another end of the measuring pin is pressed with the spring. When in measuring, the key slot gauge is disposed on the shaft. The spring is compressed and a measuring head retracts. The gauge is rotated around the shaft. If the measuring head of the measuring pin can enter into the key slot of the shaft completely under the force of the spring, the symmetry degree of the key slot of the shaft is up to the standard. If the measuring head can not enter into the key slot completely, the symmetry degree of the key slot of the shaft is not up to the standard. The symmetry degree of key slots having different width can be measured through changing different measuring pins. By using the gauge for symmetry degree of the shaft key slot in the utility model, the measuring precision and measuring speed can be improved. And the gauge for symmetry degree of the shaft key slot in the utility model has advantages of simple structure and convenient usage.

Description

Use the keyway symmetry gauge for a kind of

Technical field

The utility model relates to the measurement mechanism technical field, particularly relates to a kind of and uses the keyway symmetry gauge.

Background technology

In the keyway symmetry error measure of axle, national standard has provided measuring method, and concrete measurement mechanism is as shown in Figure 1, detects the measurement bay that needs with flat board, V-block, locating piece and band indicator.During measurement locating piece is inserted keyway, the adjustment measured piece makes locating piece radially parallel with flat board, and the measurement and positioning piece is to dull and stereotyped distance; Repeat above-mentioned measurement with behind the measured workpiece Rotate 180 ° again, obtain this cross section difference of reading a (this value is 2 times a keyway eccentric distance e) of two corresponding point up and down, the symmetry error in this cross section is:

f＝a·h/d-h

Wherein: d is a groove depth for the diameter h of axle

In practical application, because the size of keyway has error, dispose the locating piece of multiple size, otherwise measuring error is too big, therefore this method is difficult to promote the use of.Therefore each producer is according to own product accuracy requirement structure, or the cubing of project organization complex forms, or clear-cut checker estimates judgement, form or the detection cost is too high, or accuracy of detection is too low.Necessary design meets the appliance of own product needed, to satisfy the production scene demand.

The utility model content

A kind of of being to propose to existing technical matters in the above-mentioned prior art of the utility model technical matters to be solved uses the keyway symmetry gauge; This gauge design is easy to use; It is convenient to detect, and accuracy of detection can adapt to the axle of product requirement and use the keyway symmetry cubing.Improve the machining precision of shaft key groove and the quality of complete machine.

The technical matters that the utility model requires to solve can realize through following technical scheme:

Use the keyway symmetry gauge for a kind of, comprise gland, V-block, spring, measurement pin, said gland is connected with V-block; One cavity is arranged in the said gland, and said V-block centre is a cylindrical cavity, and said spring is arranged in the cavity of gland; Near the middle part one shoulder is arranged on the said measurement pin; Said measurement shoulder portion is enclosed within the spring with the preceding paragraph, and said measurement pin lowermost end is a gauge head, and said measurement pin can slide in the cylindrical cavity in V-block.

The half-angle error of said V-block is not more than 2 ".

The gauge head length of said measurement pin is greater than the tested keyway degree of depth.

Owing to adopted technique scheme, the utility model to improve the measuring accuracy and the measuring speed of the keyway symmetry on the axle.And the utility model is simple in structure, and is easy to use.

Description of drawings

Fig. 1 is that national standard measuring method axle is with keyway symmetry measurement mechanism synoptic diagram.

Fig. 2 is the utility model structural representation.

Fig. 3 is the utility model gland cut-open view.

Fig. 4 is the utility model gland vertical view.

Fig. 5 is the utility model V-block cut-open view.

Fig. 6 is the utility model V-block vertical view.

Embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and be easy to understand understanding with effect, below in conjunction with concrete diagram, further set forth the utility model.

Like Fig. 2, Fig. 3, Fig. 4, Fig. 5, shown in Figure 6, the utility model comprises gland 1, V-block 2, spring 3 and measures pin 4.Gland 1 is connected and fixed with V-block 2 usefulness screws 5, and spring 3 is in gland 1 inside, and measuring pin 4 has a shoulder 41, and shoulder 41 is enclosed within the spring 3 with top.The half-angle error of V-block 2 is not more than 2 ", guarantee to measure the central lines of selling 4 center lines and V-block 2; The center pit 21 of measuring pin 4 and V-block 2 is little clearance fit, guarantees that it can axially be free to slide.Measuring pin 4 ends is gauge heads 42, and the length of gauge head 42 is greater than the degree of depth 3mm of tested keyway, and the diameter dimension of gauge head 42 is confirmed:

D=H

The D----gauge head diameter H---keyway minimum limit of size

The symmetry of the tested keyway of f----requires the diameter h----keyway degree of depth of d----axle

During measurement, the keyway gauge is put on the axle, spring 3 is compressed; Gauge head 42 withdrawals; The gauge that sways, if measure the gauge head 42 of pin 4 can get into axle fully under the effect of spring 3 keyway, then the keyway symmetry of explanation spool is qualified; If gauge head 42 can not get into keyway fully, then the keyway symmetry of explanation axle is defective.Change different measurement pins and just can measure the keyway symmetry of different in width.

Whether the symmetry that this detection method only detects keyway is qualified, can not detect the error numerical value of its symmetry.

More than show and described the advantage of ultimate principle, principal character and the utility model of the utility model.The technician of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the instructions that the utility model just is described; The utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these variations and improvement all fall in the utility model scope that requires protection.The utility model requires protection domain to be defined by appending claims and equivalent thereof.

Claims

1. an axle is used the keyway symmetry gauge, it is characterized in that, comprises gland, V-block, spring, measurement pin; Said gland is connected with V-block, and a cavity is arranged in the said gland, and said V-block centre is a cylindrical cavity; Said spring is arranged in the cavity of gland; Near the middle part one shoulder is arranged on the said measurement pin, said measurement shoulder portion is enclosed within the spring with the preceding paragraph, and said measurement pin lowermost end is that the said measurement pin of gauge head can slide in the cylindrical cavity in V-block.

2. use the keyway symmetry gauge for a kind of as claimed in claim 1, it is characterized in that, the half-angle error of said V-block is not more than 2 ".

3. according to claim 1 or claim 2 a kind of uses the keyway symmetry gauge, it is characterized in that the gauge head length of said measurement pin is greater than the tested keyway degree of depth.