CN113008106A

CN113008106A - Arc gauge

Info

Publication number: CN113008106A
Application number: CN201911328641.9A
Authority: CN
Inventors: 唐大春; 窦艳红; 袁国君; 张家伟
Original assignee: Changchun Chunqiu Technology Development Co ltd
Current assignee: Changchun Chunqiu Technology Development Co ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2021-06-22

Abstract

The invention discloses an arc checking fixture and relates to the field of checking fixtures. In the prior art, whether the circular arc of the hub is qualified or not is determined within a reasonable error range, and the determination is usually completed by a plurality of calibration pieces, so that the time and labor are wasted, the operation is complicated, the error is large, and the result is inaccurate; the invention provides an arc gauge, which comprises a base body, a measuring rod system and a dial indicator, wherein the base body is provided with a measuring rod system; the whole base body is in a bow shape, positioning blocks are respectively arranged on the inner sides of two ends of the base body, and the positioning blocks are symmetrical about the axis of the measured arc and are tangent to the circumference of the measured arc; the substrate and the measuring rod system are fixedly connected at the inner side of the substrate, and the measuring rod is tangent to the circumference of the measured circular arc; the base body is fixedly connected with the dial indicator on the inner side. The arc gauge provided by the invention gets rid of the traditional method for measuring the arc diameter of the hub, does not need a plurality of calibration pieces, and also has the advantages of more accurate operation in the improvement process, time and labor saving and simple operation for the produced unqualified products.

Description

Arc gauge

Technical Field

The invention relates to the field of detection tools, in particular to an arc detection tool.

Background

In the mechanical field, the diameter is measured by means of calipers, micrometers, comparators and the like, but all the measurement premises are that a measuring surface for measurement is arranged on the diameter, for the change of the measuring surface which is not arranged on the diameter, the existing means is a three-coordinate or go-no-go gauge, the three-coordinate is not suitable for online production, the go-no-go gauge is qualitative measurement, the go-no-go gauge is provided with a maximum and a minimum size ring gauge, the go-no-go gauge can judge whether the circular arc is qualified or not, but can not give a specific deviation value, the product is easy to scrap in production, for large-size products, the ring gauge is very difficult to operate, a hub is one representative of the products, in the prior art, whether the circular arc of the hub is qualified or not to be determined within a reasonable error range is usually completed by a plurality of calibration pieces, time and labor are wasted, the operation is complicated, and the errors are increased by long-time abrasion, the result is inaccurate, and the size of the measured arc diameter cannot be visually seen, so that the difficulty is increased for the hub improvement process.

Disclosure of Invention

The invention provides an arc gauge which is simple to operate and visual and accurate in reading in the working process.

In order to achieve the purpose, the invention provides the following technical scheme:

an arc gauge comprises a base body, a measuring rod system and a dial indicator;

the whole base body is in a bow shape, positioning blocks are respectively arranged on the inner sides of two ends of the base body, and the positioning blocks are symmetrical about the axis of the measured arc and are tangent to the circumference of the measured arc;

the measuring rod system comprises a measuring rod body, a measuring rod, a first component, a compression spring and a second connecting piece, wherein the measuring rod body is rotatably connected with the measuring rod through the first component;

the substrate is fixedly connected with the measuring rod system on the inner side of the substrate, and the measuring rod is tangent to the circumference of the measured circular arc;

the base body is fixedly connected with the dial indicator on the outer side of the base body.

Furthermore, the positioning block is fixedly connected with the base body through a first connecting piece.

Furthermore, the base body is provided with a pair of handles which are symmetrical about the axis of the measured circular arc.

Further, the handle part is embedded in the base body so as to complete the fixed connection of the handle part and the base body.

Furthermore, the measuring rod system is fixedly connected with the base body through a plurality of second connecting pieces.

Further, the measuring rod comprises a first protruding structure and a second protruding structure, and the first protruding structure is contacted and tangent with the measured circumference; the second protruding structure is adjacent to the dial indicator.

Furthermore, the base body is provided with a plurality of through holes for matching with the second connecting piece, the compression spring and the dial indicator;

and the compression spring is fixedly connected with the middle part of the measuring rod through the through hole.

Furthermore, the dial indicator comprises a force transmission system and a reading device, and the force transmission system is fixedly connected with the base body through an indicator jacket.

Further, the force transmission system passes through the through hole to reach a position corresponding to the second protruding structure.

Furthermore, a dial indicator protection seat is arranged outside the dial indicator and fixedly connected with the base body through a plurality of third connecting pieces.

Furthermore, the diameter variation of the measured product is A, the circle center position of the measured circle has the same ratio variation distance of B, namely the ratio of the diameter variation of the measured product to the variation distance of the circle center position of the measured circle is: a and B.

The invention has the beneficial effects that:

the arc gauge provided by the invention gets rid of the traditional method for measuring the arc diameter of the hub, does not need a plurality of calibration pieces, can visually observe the change size of the diameter of the measured arc, can also enable the operation of the improvement process to be more accurate for the produced unqualified products, and simultaneously can save time and labor, is simple to operate and has reduced errors.

Drawings

FIG. 1 is a schematic structural view of a circular arc gauge provided by the invention;

FIG. 2 is a schematic diagram of a structure and position of a foot pad according to the present invention;

FIG. 3 is a schematic diagram of a calibration gauge according to the present invention;

FIG. 4 is a general schematic diagram of the product application provided by the present invention;

FIG. 5 is a cross-sectional view of the product of the present invention;

FIG. 6 is an enlarged view of a spindle system provided by the present invention;

FIG. 7 is an overall schematic view of a hub provided by the present invention;

FIG. 8 is a partial enlarged view of the hub measurement process provided by the present invention.

In the figure, the position of the upper end of the main shaft,

1. a substrate; 2. a first connecting member; 3. positioning blocks; 4. a handle; 5. a stylus system; 6. a dial indicator; 7. a dial indicator protection seat; 8. a third connecting member; 9. a meter jacket; 10. a foot pad; 11. calibrating a gauge; 12. a hub;

51. a spindle body; 52. a measuring rod; 53. a first member; 54. a compression spring; 55. a second connecting member;

521. a first bump structure; 522. a second bump structure;

61. a force transfer system; 62. a reading device;

121. an inner wheel; 122. an outer wheel; 123. a circular arc surface.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

Referring to fig. 1 to 8, an arc testing fixture provided by an embodiment of the present invention includes:

an arc gauge comprises a base body 1, a measuring rod system 5 and a dial indicator 6;

the base body 1 is integrally formed, the whole base body is in a bow shape, the inner sides of two ends of the base body are respectively provided with the positioning blocks 3, and the positioning blocks 3 are symmetrical about the axis of the measured arc and are tangent to the circumference of the measured arc; the positioning block 3 is fixedly connected with the base body 1 through a first connecting piece 2, and the first connecting piece 2 can be a connecting piece such as an inner hexagon screw;

the measuring rod system 5 comprises a measuring rod body 51, a measuring rod 52, a first part 53, a compression spring 54 and a second connecting piece 55, wherein the measuring rod body 51 is movably connected with the measuring rod 52 through the first part 53, and the first part can be a pin shaft or a cylindrical pin and other parts.

The substrate 1 and the measuring rod system 5 are fixedly connected at the inner side of the substrate, and the measuring rod 52 is tangent to the circumference of the measured circular arc;

the base body 1 is fixedly connected with the dial indicator 6 on the outer side thereof.

Further, be equipped with on base member 1 about measuring circular arc axle center symmetry's a pair of handle 4, handle 4 partial embedding in base member 1 to accomplish fixed connection between them, the handle can make the operation more convenient.

Further, the measuring rod system 5 is fixedly connected with the base body 1 through a plurality of second connecting pieces 55, and the number of the second connecting pieces can be four or five.

Further, the measuring rod 52 comprises a first convex structure 521 and a second convex structure 522, wherein the first convex structure 521 is in contact with and tangent to the measured circumference; the second raised structure 522 is adjacent to the dial indicator 6.

Furthermore, a plurality of through holes are formed in the base body 1 and used for matching with the second connecting piece 55, the compression spring 54 and the dial indicator 6;

the second connector 55 is placed in the through hole, for example: the inner hexagon screw, the flat end fastening screw and the like are used for fixedly connecting the base body 1 and the measuring rod system 5;

the compression spring 54 is fixedly connected with the middle part of the measuring rod 52 and the second connecting piece 55 through two ends of the through hole.

Further, the dial indicator 6 comprises a force transmission system 61 and a reading device 62, wherein the force transmission system 61 is fixedly connected with the base body 1 through an indicator jacket 9; the force transfer system 61 is adjacent to the second raised structure 522 and further, the force transfer system 61 is passed through the through hole to a position corresponding to the second raised structure 522.

Furthermore, a dial indicator protection seat 7 is arranged outside the dial indicator 6 and used for protecting the dial indicator from being damaged in daily use, the dial indicator protection seat 7 is fixedly connected with the base body 1 through a plurality of third connecting pieces 8, the third connecting pieces can be screws and the like, and the number of the third connecting pieces can be one or two.

Specifically, the present invention is applicable to a split-mount hub 12 for a truck, which includes an inner wheel 122 engaged with an axle and an outer wheel 121 engaged with a tire, wherein a plurality of arc surfaces 123 are spaced apart in a region where the inner wheel 122 contacts the outer wheel 121 in order to reduce the amount of fitting between the inner wheel 122 and the outer wheel 121. In order to ensure the concentricity of the coaxial assembly of the inner wheel 122 and the outer wheel 121, the circular arc surface 123 needs to be detected;

before the arc gauge works, one end of the compression spring 54 is fixedly connected with the measuring rod 52, and the other end of the compression spring is fixedly connected with the second connecting piece 55, so that the measuring rod can be kept at a balance position under the condition of no work, and the second protruding structure 522 and the force transmission system 61 can be kept close to but not in contact with each other, so that the force transmission system 61 is not stressed under the condition of no work, the pointer of the reading device 62 can be returned to zero under the condition of no work, and the abrasion can be reduced.

A plurality of convex structures, commonly called ears, are uniformly distributed on the inner side of the hub 12 along the axis direction, the ears are all arc-shaped, the outer arc and the inner arc respectively form two concentric circles, the hub 12 and the base body 1 have three contact points, wherein two ears which are symmetrical about the axis are respectively contacted with a positioning block 3 positioned on the base body 1, the positioning block 3 is tangent to the circle formed by the outer arc, the other ear is contacted with the first convex structure 521, and the first convex structure 521 is tangent to the circle formed by the outer arc;

in the using and operating process, before the wheel hub 12 is measured by the arc gauge, the calibration gauge 11 is usually used for calibrating, so that the meaning represented by the scale 0 of the dial indicator is the value set by the calibration gauge 11; during measurement, in order to enable the arc detector to accurately measure the radian of the hub 12, the foot pad 10 is arranged below the arc detector, so that the arc detector can measure in a stable environment. The wheel hub rim of the truck is formed by a plurality of sections of uniformly distributed concentric arcs, in order to accurately measure the diameter, the checking fixture structure adopts a three-point method for measurement, a base body 1 is of an arch structure, two positioning blocks 3 are fastened on the inner side of the base body 1 in the arch shape, a body 51 is movably connected with a measuring rod 52 through a round pin column, a measuring rod system 5 is fastened on the middle part of the base body 1 in the arch shape, the center of a first bulge structure 521 is positioned in the symmetrical plane of the two positioning blocks 3, three surfaces of the measuring planes of the two positioning blocks 3 and the first bulge structure 521 are tangent to a cylindrical surface, a force transmission system 61 is measured on the surface of a second bulge structure 522, when the diameter size of a measured product is changed, the position of the center of the measured circle is changed in the same proportion, meanwhile, the measured circle generatrix tangent to the first bulge structure 521 can also be changed in the same size with the circle center, in the measuring process, the measuring plane of the first bulge structure, the changed position of the measured round bus is equal to the displacement distance of the measured surface of the first convex structure 521, the displacement distance of the second convex structure 522 is changed in the same ratio with the displacement distance of the first convex structure 521 according to the mathematical relation operation, and the indication of the dial indicator is the diameter variable quantity; the measured hub diameter is therefore the sum of the value set by the calibration gauge and the percentile.

Claims

1. The arc gauge is characterized by comprising a base body (1), a measuring rod system (5) and a dial indicator (6);

the base body (1) is in a bow shape as a whole, positioning blocks (3) are arranged on the inner sides of two ends of the base body respectively, and the positioning blocks (3) are symmetrical about the axis of the measured arc and are tangent to the circumference of the measured arc;

the measuring rod system (5) comprises a measuring rod body (51), a measuring rod (52), a first component (53), a compression spring (54) and a second connecting piece (55), wherein the measuring rod body (51) is rotatably connected with the measuring rod (52) through the first component (53);

the base body (1) is fixedly connected with the measuring rod system (5) at the inner side thereof, and one side of the measuring rod (52) is tangent to the circumference of the measured circular arc;

the base body (1) is fixedly connected with the dial indicator (6) on the outer side.

2. The arc testing fixture according to claim 1, wherein the positioning block (3) is fixedly connected with the base body (1) through a first connecting piece (2).

3. The arc testing fixture according to claim 1, wherein the base body (1) is provided with a pair of handles (4) which are symmetrical about the axis of the measured arc, and the handles (4) are partially embedded in the base body (1) to complete the fixed connection between the handles.

4. The arc testing fixture according to claim 1, wherein the measuring rod system (5) is fixedly connected to the base body (1) by a plurality of second connecting members (55).

5. The arc testing fixture according to claim 3, characterized in that the measuring rod (52) comprises a first convex structure (521) and a second convex structure (522), the first convex structure (521) is contacted and tangent with the measured circumference; the second raised structure (522) is adjacent to the dial indicator (6).

6. The arc testing fixture according to claim 4, wherein the base body (1) is provided with a plurality of through holes for matching with the second connecting piece (55), the compression spring (54) and the dial indicator (6);

the compression spring (54) is fixedly connected with the middle part of the measuring rod (52) through a through hole.

7. The arc testing fixture according to claim 5, wherein the dial indicator (6) comprises a force transmission system (61) and a reading device (62), and the force transmission system (61) is fixedly connected with the base body (1) through an indicator jacket (9).

8. The arc testing fixture of claim 7, wherein said force transfer system (61) is adapted to pass through said through hole to a position corresponding to said second protrusion (522).

9. The arc testing fixture according to claim 7, characterized in that a dial indicator protection seat (7) is arranged outside the dial indicator (6), and the dial indicator protection seat (7) is fixedly connected with the base body (1) through a plurality of third connecting pieces (8).

10. The arc testing fixture according to claim 1, wherein the diameter variation of the tested product is a, and the circle center position of the tested circle has a same ratio variation distance of B, i.e. the ratio of the diameter variation of the tested product to the variation distance of the circle center position of the tested circle is: a and B.