CN215572642U

CN215572642U - Convenient detecting instrument for symmetry degree of flat key and key groove in hole of mechanical part

Info

Publication number: CN215572642U
Application number: CN202121193051.2U
Authority: CN
Inventors: 刘建; 刘香妤
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2022-01-18
Anticipated expiration: 2031-05-31

Abstract

The utility model discloses a convenient instrument for detecting the symmetry degree of a flat key keyway in a hole of a mechanical part, which comprises a mechanism body, wherein a cross-shaped groove is formed in the mechanism body, a positioning block assembly is arranged in the cross-shaped groove, baffles are symmetrically fixed at the upper end and the lower end of the opening part of the cross-shaped groove, the positioning block assembly comprises two symmetrically arranged positioning reference blocks, an expansion positioning wedge block is arranged between the two positioning reference blocks, and the expansion positioning wedge block is in sliding fit with the positioning reference blocks at the two sides. During detection, the side surfaces of the two positioning reference blocks are directly contacted and positioned with the two side surfaces of the key groove, and the difference between the sizes of the two side surfaces and the bus bars at the two sides of the detected hole is the actual error of symmetry. Therefore, the utility model can solve the problem of convenient detection in a production field, can solve the problem that the symmetry degree of the flat key grooves in most holes relative to the axes can not meet the precision requirement at present, and has the advantages of simple operation, high detection efficiency, strong universality, high detection precision and the like.

Description

Convenient detecting instrument for symmetry degree of flat key and key groove in hole of mechanical part

Technical Field

The utility model relates to a convenient detecting instrument for the symmetry degree of a flat key groove in a hole of a mechanical part, and belongs to the technical field of key groove symmetry degree detecting tools.

Background

The detection of the symmetry degree of the flat key groove in the hole relative to the axis is a seemingly simple precision detection problem, but a simple detection method is lacked for a long time, particularly the detection cannot be carried out on a production field, and the detection method is a long-standing puzzle and pain point in the machining industry. Currently, several commonly used detection methods are characterized in that:

a. and (5) detecting by using a three-coordinate detector. The method has low detection efficiency, high detection equipment cost, needs special operation and is not suitable for batch production.

b. And detecting by using a special detection tool in combination with a dial indicator, a vernier and the like. The detection tool is complex in structure and operation, low in efficiency, high in operation technical requirement and free of universality.

c. The projector is used for amplifying detection, a specially-assigned person operates, the detection cannot be carried out on a processing site, and the use is inconvenient.

Therefore, the detection of the key groove of the flat key in the hole relative to the axial symmetry (hereinafter referred to as the key groove symmetry) is always a difficult point, and the key groove symmetry precision in production is caused to be up to the requirement, so that a plurality of parts are in faulty operation, the service life of the flat key structure part is seriously influenced, equipment faults are often caused, and a lot of hidden dangers are brought to the safe operation of the equipment.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides the convenient detection instrument for the symmetry degree of the flat key groove in the hole of the mechanical part.

The utility model is formed as follows: the utility model provides a convenient detecting instrument of downthehole parallel key keyway symmetry of machine part, includes the mechanism body, has seted up "cross" shape groove in the mechanism body, installs the locating block subassembly at "cross" shape inslot, is fixed with the baffle at both ends symmetry about the oral area in "cross" shape groove, the locating block subassembly includes two location reference blocks that set up symmetrically, is provided with the expansion location voussoir between two location reference blocks, and the location reference block sliding fit of expansion location voussoir and both sides.

Furthermore, the rear part of the mechanism body is provided with a square hole communicated with the cross-shaped groove, the baffles at the upper end and the lower end are symmetrically provided with a U-shaped groove with the height consistent with that of the square hole, the positioning reference block is in a cross-shaped structure, and bosses at the front end and the rear end of the cross-shaped structure are respectively in limit fit with the square hole and the U-shaped groove.

Furthermore, a second elastic element is fixedly mounted on one side of the mechanism body, and the second elastic element is in contact extrusion with the side surface of the positioning reference block on the side.

Furthermore, two counter bores are respectively formed in the top of the mechanism body and the top of the upper end baffle, and a first elastic element is fixedly mounted in each counter bore.

Furthermore, the expansion positioning wedge block is of a cross-shaped structure, and a handle is arranged at the extending end of the cross-shaped structure.

Due to the adoption of the technical scheme, the utility model has the advantages that: the positioning block assembly consists of two positioning reference blocks and an expanding positioning wedge block, the side surfaces of the two positioning reference blocks are directly contacted and positioned with the two side surfaces of the key groove during detection, and the difference between the sizes of the two side surfaces and the buses at the two sides of a detected hole is the actual error of symmetry. Therefore, the utility model can solve the problem of convenient detection in a production field, can solve the problem that the symmetry degree of the flat key grooves in most holes relative to the axes can not meet the precision requirement at present, and has the advantages of simple operation, high detection efficiency, strong universality, high detection precision and the like.

Drawings

FIG. 1 is a perspective view of a schematic structural view of the present invention;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is a front view of the structural schematic of the present invention;

FIG. 4 is a left side view of FIG. 3;

FIG. 5 is a top view of FIG. 3;

FIG. 6 is a perspective view of a schematic structural view of the mechanism body;

FIG. 7 is a front view of a schematic structural view of a positioning block assembly;

fig. 8 is a left side view of fig. 7.

Description of reference numerals: 1-a positioning block assembly, 2-a first elastic element, 3-a handle, 4-a second elastic element, 5-a mechanism body, 6-a baffle, 7-a detected hole, 8-a positioning reference block, 9-an expansion positioning wedge block, 10-a square hole, 11-a U-shaped groove and 12-a counter bore.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples.

The embodiment of the utility model comprises the following steps: as shown in fig. 1 to 8, the instrument for conveniently detecting the symmetry degree of a flat key keyway in a hole of a mechanical part comprises a mechanism body 5, wherein a cross-shaped groove is formed in the mechanism body 5, a positioning block assembly 1 is arranged in the cross-shaped groove, baffles 6 are symmetrically fixed at the upper end and the lower end of the opening of the cross-shaped groove, the positioning block assembly 1 comprises two symmetrically arranged positioning reference blocks 8, and the outer side of the lower end of each positioning reference block (8) is of a right-angle structure so as to be conveniently attached to the keyway; an expansion positioning wedge block 9 is arranged between the two positioning reference blocks 8, and the expansion positioning wedge block 9 is in sliding fit with the positioning reference blocks 8 on the two sides. The rear part of the mechanism body 5 is provided with a square hole 10 communicated with a cross-shaped groove, the baffles 6 at the upper end and the lower end are symmetrically provided with a U-shaped groove 11 with the height identical to that of the square hole 10, the positioning reference block 8 is in a cross-shaped structure, and bosses at the front end and the rear end of the cross-shaped structure are respectively in limit fit with the square hole 10 and the U-shaped groove 11, so that the two positioning reference blocks 8 can only move left and right in the cross-shaped groove and cannot move up and down. The second elastic element 4 is fixedly installed on one side of the mechanism body 5, and the second elastic element 4 is in contact extrusion with the side surface of the positioning reference block 8 on the side. Two counter bores 12 are respectively arranged at the tops of the mechanism body 5 and the upper end baffle 6, and the first elastic element 2 is fixedly arranged in the counter bores 12. The expansion positioning wedge block 9 is of a cross-shaped structure, and a handle 3 is arranged at the extending end of the cross-shaped structure. The first elastic element 2 and the second elastic element 4 can be made of elastic rubber, a spring or silica gel.

The detection process of the utility model is as follows:

during detection, a workpiece is fixedly placed, a key groove in a detected hole 7 of the workpiece is located at a position convenient to detect, an expansion positioning wedge block 9 in a positioning block assembly 1 is lifted, the thickness of the positioning block assembly 1 is narrowed under the extrusion of a second elastic element 4, a symmetry detection instrument can be directly placed in the detected hole 7, the lower ends of two positioning reference blocks 8 in the positioning block assembly 1 are placed in the detected key groove, the symmetry detection instrument is pressed by a first elastic element 2 from the top, the lower ends of the two positioning reference blocks 8 are close to the bottom of the solid key groove, and at the moment, the expansion positioning wedge block 9 in the positioning block assembly 1 is pressed downwards towards the key groove, so that the self-locking of the positioning block assembly cannot slide back, and the positioning is completed. And measuring the sizes L1 and L2 between the two side surfaces of the positioning block assembly 1 and the generatrices at the left side and the right side of the detected hole 7 respectively by using an inner micrometer, a vernier caliper and a cylindrical pin plug gauge and the like, and recording the measured sizes, wherein the difference between L1 data and L2 data is the actual symmetry error of the key groove. If detect small-size hole key, can use the cylindric lock plug gauge to detect, behind locating piece subassembly 1 leaned on the keyway, there is the trend of scattering above that, and this trend is eliminated by second elastic element 4 extrusion. When the instrument is disassembled, the expansion positioning wedge block 9 is lifted upwards, and the whole symmetry degree detection instrument is directly taken down.

Each flat key with standard size and specification should be provided with a symmetry degree detection instrument with corresponding size, in order to enable the symmetry degree detection instrument to detect the width of the same key groove and the condition of overlarge diameter size range, the size of the first elastic element 2 can be replaced, and the first elastic element 2 can be replaced according to the diameter size of the detected hole 7, so that the key groove detection instrument can be pressed by the first elastic element 2.

Second, precision adjustment and calibration of symmetry degree detecting instrument

According to the measurement requirement, the symmetry degree detection instrument should pass through the measurement detection department to be checked before use, and the items needing to be checked are as follows: 1. the parallelism error of the two side surfaces of the positioning block assembly 1, the flatness error of the two side surfaces of the positioning block assembly 1 and the perpendicularity error of the two side surfaces and the bottom surface of the positioning block assembly 1 are respectively obtained by 2 and 3.

In summary, the positioning block assembly 1 of the present invention is composed of two positioning reference blocks 8 and an expanding positioning wedge 9, the side surfaces of the two positioning reference blocks 8 are directly contacted and positioned with the two side surfaces of the key slot during the detection, and the difference between the sizes of the two side surfaces and the bus bars at the two sides of the detected hole, i.e. the actual error of symmetry, is obtained. Therefore, the utility model can solve the problem of convenient detection in a production field, can solve the problem that the symmetry degree of the flat key grooves in most holes relative to the axes can not meet the precision requirement at present, and has the advantages of simple operation, high detection efficiency, strong universality, high detection precision and the like.

Claims

1. The utility model provides a convenient detecting instrument of downthehole parallel key keyway symmetry of machine part, includes mechanism body (5), its characterized in that: the mechanism is characterized in that a cross-shaped groove is formed in the mechanism body (5), a positioning block assembly (1) is installed in the cross-shaped groove, baffle plates (6) are symmetrically fixed at the upper end and the lower end of the opening of the cross-shaped groove, the positioning block assembly (1) comprises two positioning reference blocks (8) which are symmetrically arranged, an expansion positioning wedge block (9) is arranged between the two positioning reference blocks (8), and the expansion positioning wedge block (9) is in sliding fit with the positioning reference blocks (8) on two sides.

2. The convenient detecting instrument for the symmetry degree of the flat key and the key groove in the hole of the mechanical part according to claim 1, is characterized in that: the mechanism is characterized in that a square hole (10) communicated with a cross-shaped groove is formed in the rear portion of the mechanism body (5), U-shaped grooves (11) with the same height as the square hole (10) are symmetrically formed in the baffle plates (6) at the upper end and the lower end, the positioning reference block (8) is of a cross-shaped structure, and bosses at the front end and the rear end of the cross-shaped structure are in limit assembly with the square hole (10) and the U-shaped grooves (11) respectively.

3. The convenient detecting instrument for the symmetry degree of the flat key and the key groove in the hole of the mechanical part according to claim 1, is characterized in that: and a second elastic element (4) is fixedly arranged on one side of the mechanism body (5), and the second elastic element (4) is in contact extrusion with the side surface of the positioning reference block (8) on the side.

4. The convenient detecting instrument for the symmetry degree of the flat key and the key groove in the hole of the mechanical part according to claim 1, is characterized in that: counter bores (12) are respectively formed in the top of the mechanism body (5) and the top of the upper end baffle (6), and a first elastic element (2) is fixedly mounted in the counter bores (12).

5. The convenient detecting instrument for the symmetry degree of the flat key and the key groove in the hole of the mechanical part according to claim 1, is characterized in that: the expansion positioning wedge block (9) is of a cross-shaped structure, and a handle (3) is arranged at the extending end of the cross-shaped structure.