CN216745897U

CN216745897U - Symmetry degree detection tool

Info

Publication number: CN216745897U
Application number: CN202220230494.2U
Authority: CN
Inventors: 黎梅; 任光华
Original assignee: Chongqing Xingji Gear Co ltd
Current assignee: Chongqing Xingji Gear Co ltd
Priority date: 2022-01-27
Filing date: 2022-01-27
Publication date: 2022-06-14
Anticipated expiration: 2032-01-27

Abstract

The utility model relates to the technical field of detection tools for shaft members to be detected. The symmetry degree gauge comprises two measuring blocks, a clamping part for clamping a shaft to be measured and two guide blocks, wherein the guide blocks are arranged on the clamping part, a scale layer is arranged on each guide block, the distance between the two guide blocks is larger than the diameter of the shaft to be measured, and the two guide blocks are parallel; the measuring block is connected with the guide block in a sliding manner, and the width of the measuring block is smaller than that of the key groove; the distance between the two measuring blocks is smaller than the diameter of the shaft to be measured. The scheme mainly solves the problem that the efficiency of the detection mode for the symmetry degree of the double key grooves on the shaft to be detected is low in the prior art.

Description

Symmetry degree detection tool

Technical Field

The utility model relates to the technical field of detection tools for shaft parts.

Background

The symmetry measurement of the shaft key groove is widely applied to the aspects of motors, machine tools, automobile manufacturing and the like, and is very important for mechanical assembly; the key grooves can be divided into a single key groove, a double key groove and a spline groove, and the torque transmitted by the double key groove is fifty percent larger than that transmitted by the single key groove, so that the double key groove is commonly used for transmitting large torque; such as air turbine compressors and speed increasers associated therewith, are often provided with double keyways on their main shafts and gears. Compared with a single key groove, the double key groove has higher requirement on the symmetry degree. Even if the width dimension of the double key groove is machined accurately, the symmetry degree of the double key groove does not meet the requirement of form and position tolerance, and the situation of no-further assembly can also occur during assembly. In the prior art, the method for measuring the symmetry degree of the double key grooves mainly uses V-shaped iron, a flat plate, a dial indicator and a meter to measure by a common-name meter making method, but the method is inconvenient to operate, complicated in measuring means and poor in precision and reliability.

In order to solve the problems of the existing double-key-groove symmetry degree measuring method, Chinese patent CN202452940U discloses an axle double-key-groove symmetry degree gauge, and aims to solve the problems of complex structure, inconvenient operation, high installation difficulty and poor measuring precision of the symmetry degree gauge in the prior art. The measuring device comprises a measuring tool seat, a dial indicator and a positioning block, wherein the measuring tool seat is in a U shape which is symmetrical left and right, the dial indicator is detachably fixed outside the measuring tool seat, a measuring head of the dial indicator extends into the measuring tool seat, and the axis of a measuring rod of the dial indicator is superposed with the symmetrical axis of the measuring tool seat; positioning holes are symmetrically formed in the two sides of the checking fixture seat along the direction perpendicular to the symmetry axis of the checking fixture seat in the left-right direction, and the positioning holes are matched with the positioning blocks; during detection, the detection tool seat needs to slide left and right, the highest point of the detected shaft is found out according to the reading displayed by the dial plate of the dial indicator, and the reading A of the dial indicator at the moment is recorded; rotating the measured shaft by 180 degrees, finding out the highest point of the measured shaft in the opposite direction in the same way, and recording the reading A' of the dial indicator at the moment; and comparing and calculating the readings A and A' of the previous and next times to obtain the eccentricity of the measured shaft, and calculating the symmetry degree of the double key grooves according to a key groove symmetry degree formula of the shaft.

The applicant finds that the problem of whether the symmetry degree of the double key grooves is qualified at present mainly focuses on whether the offset distance of the center lines of the double key grooves relative to the center line of the shaft to be measured is within a standard interval value, if the offset distance is within the standard interval value, the double key grooves are qualified, otherwise, the double key grooves are unqualified; chinese patent CN202452940U has improved examining utensil, has simplified the detection step to a certain extent, but because need carry out relatively comprehensive detection to the double key groove symmetry, it is still comparatively complicated to detect, and detection efficiency is low, consequently, whether the skew distance of central line about waiting to detect shaft member central line to a double key groove carries out short-term test's utensil in the interval value of standard now urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a symmetry degree detection tool to solve the problem that the detection mode of the symmetry degree of a double-key groove on a shaft to be detected in the prior art is low in efficiency.

In order to achieve the above object, the basic scheme of the utility model is as follows: a symmetry degree gauge comprises two measuring blocks, a clamping part for clamping a shaft to be measured and two guide blocks, wherein the guide blocks are arranged on the clamping part, a scale layer is arranged on each guide block, the distance between the two guide blocks is larger than the diameter of the shaft to be measured, and the two guide blocks are parallel; the measuring block is connected with the guide block in a sliding manner, and the width of the measuring block is smaller than that of the key groove; the distance between the two measuring blocks is smaller than the diameter of the shaft to be measured.

The advantages of the basic scheme are:

in the scheme, the zero point of the scale layer is located at the center of the guide block, and the numerical value of the scale layer gradually increases towards the two sides of the guide block by taking the zero point as the center.

1. According to the scheme, the clamping of the shaft to be measured is completed through the clamping part, and the two measuring blocks are respectively positioned in the double key grooves of the shaft to be measured; pushing the measuring block to slide leftwards in the key groove, enabling the measuring block to be abutted against the left side wall of the key groove, and checking the scale layer on the guide block at the moment and recording the scale layer as A; pushing the measuring block to slide rightwards in the key groove, so that the measuring block is abutted against the right side wall of the key groove, and at the moment, looking up the scale layer on the guide block and recording as B; calculating the difference value of the upper key slots A and B as C1, wherein the absolute value of C1 is the symmetry degree of the upper key slots; calculating the difference value of the lower key grooves A and B as C2, wherein the absolute value of C2 is the symmetry degree of the lower key grooves; whether the absolute value of the difference value between the C1 and the C2 is within the standard interval value or not is calculated, whether the symmetry degree of two symmetrical key grooves on the shaft to be detected meets the requirement or not can be simply and quickly judged, and compared with the detection mode of the Chinese patent CN202452940U, the detection mode of the scheme is simpler and more convenient, and the detection efficiency is higher.

2. Chinese patent CN202452940U need the erection fixture piece when detecting at every turn, complex operation, and detection measuring block need not the installation in this scheme, has saved installation procedure, can directly carry out detection work, has improved work efficiency.

3. Chinese patent CN202452940U detects the back that finishes at every turn, still need to pull down the locating piece and receive and put, causes losing of locating piece easily, and measures the piece setting in this scheme and on examining the utensil, need not to dismantle, and then can not cause losing of measuring piece.

Furthermore, the clamping part comprises two clamping blocks, and two ends of the guide block are fixedly connected with the two clamping blocks respectively.

Through the arrangement, the shaft piece to be measured is clamped through the two clamping blocks.

Furthermore, the clamping block is used for being an arc-shaped surface with the surface contacting with the shaft to be measured.

Through the arrangement, the arc-shaped surface has more contact surfaces with the shaft to be measured, and the clamping effect of the shaft to be measured is further enhanced.

Furthermore, the radius of the circle of the surface of the clamping block, which is used for being in contact with the shaft to be measured, is the same as the radius of the shaft to be measured.

Through the arrangement, the contact surfaces of the clamping blocks and the shaft piece to be measured are more and more sufficient, and the clamping effect of the shaft piece to be measured is enhanced.

Further, the clamping block is arc-shaped.

Through the arrangement, materials can be saved, and cost is reduced.

Further, the distance between the two measuring blocks is not smaller than the distance between the two key grooves.

Through the arrangement, when the distance between the two measuring blocks is equal to the distance between the double key grooves, the measuring blocks can transversely slide in the key grooves; when the distance between the two measuring blocks is larger than the distance between the two key grooves, the measuring blocks can also transversely slide in the key grooves; and then can be applicable to the detection of different degree of depth keyways.

Further, the scale layer is positioned on one side of the guide block close to the other guide block.

Through the arrangement, the staff can observe more visually.

Drawings

FIG. 1 is a front view of a first embodiment of a symmetry level gauge according to the present invention;

fig. 2 is a front view of a second embodiment of a symmetry degree gauge according to the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the device comprises a clamping block 10, a guide block 20, a scale layer 21, a measuring block 30, a shaft piece to be measured 40 and a key groove 41.

Example one

Substantially as shown in figure 1: a symmetry degree gauge comprises a clamping part and two guide blocks 20, wherein the clamping part is used for clamping a shaft element 40 to be measured, the clamping part comprises two clamping blocks 10, and the two clamping blocks 10 are both arc-shaped; the shaft piece 40 to be measured is clamped through the inner side surfaces of the two clamping blocks 10, the inner side surfaces of the clamping blocks 10 are arc-shaped surfaces, the radius of a circle where the inner side surfaces of the clamping blocks 10 are located is the same as that of the shaft piece 40 to be measured, and the inner side surfaces of the clamping blocks 10 are completely attached to the outer surface of the shaft piece 40 to be measured.

The both ends of guide block 20 respectively with two grip block 10 rigid couplings, specifically are: the two clamping blocks 10 are vertically arranged, and the inner side surfaces of the two clamping blocks 10 are transversely arranged oppositely; one guide block 20 is positioned at the upper ends of the two clamping blocks 10, and the other guide block 20 is positioned at the lower ends of the two clamping blocks 10; the two guide blocks 20 are arranged in parallel in the horizontal direction, and the distance between the two guide blocks 20 is larger than the diameter of the shaft member 40 to be measured. The guide block 20 is provided with a scale layer 21, and the scale layer 21 is arranged on the inner side of the guide block 20; the zero point of the scale layer is positioned at the center of the guide block, and the numerical value of the scale layer is gradually increased towards the two sides of the guide block by taking the zero point as the center.

The guide block 20 is connected with a measuring block 30 in a sliding manner, the width of the measuring block 30 is smaller than that of the key slot 41, and the measuring block 30 and the key slot 41 are both rectangular; after the shaft to be measured 40 is clamped, the two measuring blocks 30 are respectively positioned in the double key slots of the shaft to be measured 40, and the measuring blocks 30 can transversely slide in the key slots 41, namely, the distance between the two measuring blocks 30 is smaller than the diameter of the shaft to be measured 40; the spacing of the two measuring blocks 30 is equal to the spacing of the double keyways.

The specific implementation process is as follows:

when the device is used, the shaft 40 to be measured penetrates into the gap between the two clamping blocks 10, so that the inner side surfaces of the two clamping blocks 10 are abutted against the shaft 40 to be measured, and the shaft 40 to be measured is clamped; in addition, during the period that the shaft member 40 to be measured penetrates into the gap between the two clamping blocks 10, the double key grooves on the shaft member 40 to be measured are vertically arranged, the two measuring blocks 30 are respectively positioned in the two symmetrical key grooves 41 on the shaft member 40 to be measured, and the measuring blocks 30 are in contact with one sides of the key grooves 41 close to the axis of the shaft member 40 to be measured.

After clamping the shaft member 40 to be measured is completed, pushing the measuring block 30 to slide leftwards in the key slot 41, so that the measuring block 30 is opposite to the left side wall of the key slot 41, and at this time, looking up the scale layer 21 on the guide block 20 and recording as A; pushing the measuring block 30 to slide rightwards in the key slot 41, so that the measuring block 30 is abutted against the right side wall of the key slot 41, and at this time, looking up the scale layer 21 on the guide block 20 and recording as B; calculating the difference between the upper A and the upper B as C1, wherein the absolute value of C1 is the symmetry of the upper key slot; calculating the difference value of the lower A and the lower B as C2, wherein the absolute value of C2 is the symmetry of the lower key groove; then calculating whether the absolute value of the difference value between the C1 and the C2 is within a standard interval value, if so, the symmetry of the two key slots 41 meets the requirement, otherwise, the absolute value does not meet the requirement; therefore, whether the symmetry degrees of the two symmetrical key grooves 41 on the shaft to be detected 40 meet the requirements can be simply and quickly judged by adopting the mode; compared with the prior art, the scheme has the advantages of simpler detection mode and higher detection efficiency.

If a plurality of groups of double key grooves need to be detected, the shaft part 40 to be detected needs to be taken out firstly, and then the same method is adopted to detect the new double key grooves one by one.

Example two

Substantially as shown in figure 2: the structure and implementation of the second embodiment are substantially the same as those of the first embodiment, and the differences are as follows: the distance between the two measuring blocks 30 is greater than the distance between the double keyways.

During the use, during the shaft member 40 that awaits measuring penetrates the clearance between two grip blocks 10, two measuring block 30 are located two symmetrical keyways 41 on the shaft member 40 that awaits measuring respectively, and measuring block 30 and keyway 41 are close to the axle center one side of waiting to measure the shaft member 40 and contactless to this can reduce measuring block 30 lateral sliding's resistance, makes measuring block 30 lateral sliding more smooth and easy.

In addition, after the shaft member 40 to be measured is clamped by the two clamping blocks 10, the measuring block 30 is positioned in the key groove 41; even if the shaft 40 to be measured rotates a little to make the double-key groove on the shaft 40 to be measured deflect along the vertical direction, the measuring block 30 can still transversely slide in the key groove 41, that is, the detection can still be completed, and the detection effectiveness is further ensured.

The foregoing is merely an example of the present invention and common general knowledge of known specific structures and/or features of the schemes is not described herein in excess. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. The utility model provides an utensil is examined to symmetry, includes two measuring blocks, its characterized in that: the device also comprises a clamping part used for clamping the shaft to be measured and two guide blocks, wherein the guide blocks are arranged on the clamping part, a scale layer is arranged on each guide block, the distance between the two guide blocks is greater than the diameter of the shaft to be measured, and the two guide blocks are parallel; the measuring block is connected with the guide block in a sliding manner, and the width of the measuring block is smaller than that of the key groove; the distance between the two measuring blocks is smaller than the diameter of the shaft to be measured.

2. The symmetry testing fixture of claim 1, wherein: the clamping part comprises two clamping blocks, and two ends of the guide block are fixedly connected with the two clamping blocks respectively.

3. The symmetry testing fixture of claim 2, wherein: the clamping block is used for being the arcwall face with the one side of waiting to survey the shaft piece contact.

4. The symmetry testing fixture of claim 3, wherein: the radius of a circle of one surface of the clamping block, which is used for being in contact with the shaft to be measured, is the same as the radius of the shaft to be measured.

5. The symmetry testing fixture of claim 4, wherein: the clamping block is arc-shaped.

6. The symmetry degree gauge according to any one of claims 1 to 4, wherein: the distance between the two measuring blocks is not less than the distance between the two key slots.

7. The symmetry testing fixture of claim 1, wherein: the scale layer is positioned on one side of the guide block close to the other guide block.