CN113983906B - Hole roundness measuring device - Google Patents
Hole roundness measuring device Download PDFInfo
- Publication number
- CN113983906B CN113983906B CN202110441329.1A CN202110441329A CN113983906B CN 113983906 B CN113983906 B CN 113983906B CN 202110441329 A CN202110441329 A CN 202110441329A CN 113983906 B CN113983906 B CN 113983906B
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- measuring
- rod
- guide rod
- channel
- hole
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
- G01B5/201—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures for measuring roundness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/003—Measuring of motor parts
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention discloses a hole roundness measuring device, which comprises: the lower end of the measuring main rod is provided with a first right-angle channel and a second right-angle channel, each right-angle channel comprises a vertical channel and a horizontal channel which are mutually connected, and the port of the horizontal channel is positioned on the outer circumferential wall of the measuring main rod; the dial indicator bracket is provided with a dial indicator, and a dial indicator measuring head is contacted with a measuring block; the first measuring guide rod is vertically arranged below the measuring block and is connected with the measuring block, and the lower end of the first measuring guide rod is inserted into the vertical channel of the first right-angle channel; the second measuring guide rod is vertically arranged below the dial indicator bracket and is connected with the dial indicator bracket, and the lower end of the second measuring guide rod is inserted into the vertical channel of the second right-angle channel; at least two measuring heads which are respectively arranged at the ports of the two channels and are attached to the inner wall of the hole to be measured; the ball beads are arranged between each measuring head and the tail ends of the first measuring guide rod and the second measuring guide rod, so that the horizontal positions of the measuring heads are transmitted to the ball beads and converted into vertical displacements of the first measuring guide rod and the second measuring guide rod.
Description
Technical Field
The invention relates to an auxiliary measuring device, in particular to a hole roundness measuring device.
Background
Engine blocks are well known as one of the core components of an engine, which has a very important role in the engine. The cylinder hole in the engine cylinder body can play a role in pushing the piston connecting rod to do work after gasoline and air are mixed and exploded.
In order to ensure the air tightness of the cylinder bores and the pistons in the engine block, the cylinder bores need to have high accuracy. In the prior art, a manufacturing process for a cylinder bore generally employs: rough boring, fine boring and honing.
After the finish boring operation, the roundness dimension is mainly ensured by the rotation precision of the main shaft of the machine tool, and the roundness dimension has an important influence on the subsequent honing roundness. If the roundness error after finish boring is larger, uneven honing allowance is caused, the partial cylinder hole honing allowance is easily insufficient, and the partial cylinder hole honing allowance is overlarge, so that honing oilstones are damaged and particles fall off. Therefore, in order to ensure the hole roundness size after the finish boring operation, the roundness size of the cylinder hole after the finish boring needs to be measured quickly and accurately after the machining.
Therefore, in order to solve the above problems in the prior art, some researchers have conducted related optimization designs, and have obtained the following improvements:
1. as shown in fig. 1, the inner diameter dial indicator is measured in the longitudinal direction and the transverse direction according to the operation of fig. 1, and the difference value between the two measurements of the inner diameter dial indicator in the longitudinal direction and the transverse direction is used as roundness error.
2. The cylinder bore is measured with a three-coordinate measuring machine.
3. The cylinder bore is measured with a roundness measuring instrument.
However, the three improved schemes still have certain defects, when the scheme 1 is adopted to measure the inner diameter dial indicator in two directions of vertical and horizontal respectively, the measuring process is complicated, the inner diameter dial indicator needs to be put into a cylinder hole repeatedly for many times, the operation is complex, the two measurements may not be the same section, and the measuring error exists. When the scheme 2 and the scheme 3 are adopted and the three-coordinate measuring instrument and the roundness measuring instrument are used for measuring the cylinder hole, the cylinder hole needs to be sent to a measuring chamber, the measuring period is long, and the production efficiency is affected.
Therefore, in order to solve the above problems in the prior art, it is desirable to obtain a hole roundness measuring apparatus which can quickly and accurately measure an error of a cylinder hole roundness at one time by a reasonable structural design, unlike the improvement in the prior art. The measuring device has the advantages of simple structure, convenient maintenance, high measuring precision and convenient use, and has very good popularization prospect and application value.
Disclosure of Invention
The invention aims to provide a measuring device for the roundness of a hole, which can quickly and accurately measure the error of the roundness of a cylinder hole at one time through reasonable structural design. The measuring device has the advantages of simple structure, convenient maintenance, high measuring precision and convenient use, and has very good popularization prospect and application value.
In order to achieve the above object, the present invention provides a hole roundness measuring apparatus, comprising:
the measuring main rod is provided with a first right-angle channel and a second right-angle channel at the lower end, wherein each right-angle channel comprises a vertical channel and a horizontal channel which are mutually connected, and a port of the horizontal channel is positioned on the outer circumferential wall of the measuring main rod;
a dial indicator bracket;
the dial indicator is arranged on the dial indicator bracket;
a measuring block which is in contact with a measuring head of the dial indicator;
the first measuring guide rod is vertically arranged below the measuring block and is connected with the measuring block, and the lower end of the first measuring guide rod is inserted into the vertical channel of the first right-angle channel;
the second measuring guide rod is vertically arranged below the dial indicator bracket and is connected with the dial indicator bracket, and the lower end of the second measuring guide rod is inserted into the vertical channel of the second right-angle channel;
the measuring heads are respectively arranged at the ports of the horizontal channels of the first right-angle channel and the second right-angle channel and are used for being attached to the inner wall of the hole to be measured;
the plurality of ball beads are correspondingly arranged between each measuring head and the tail end of the corresponding first measuring guide rod or second measuring guide rod, so that the horizontal position of the measuring head is transferred to the first measuring guide rod and the second measuring guide rod and converted into vertical displacement of the first measuring guide rod and the second measuring guide rod.
Further, in the hole roundness measuring apparatus of the present invention, at least three planar four-bar mechanisms are further included, each of which is connected to the measuring boom, wherein each of the planar four-bar mechanisms includes:
a vertically arranged pull rod;
the middle part of the first short rod is hinged with the lower end of the pull rod, and one end of the first short rod is hinged with the measuring main rod;
the upper end of the long rod is hinged with the other end of the first short rod;
and one end of the second short rod is hinged with the lower end of the long rod, and the other end of the second short rod is hinged with the measuring main rod.
The pulling of the pull rod in the vertical direction changes the radial distance between the main measuring rod and the long rod.
Further, in the hole roundness measuring device of the present invention, the long rod is provided with a support pin.
Further, in the hole roundness measuring device of the present invention, at least two support pins are provided on each long rod.
Further, in the hole roundness measuring device, the step surfaces are arranged on the pull rods, pull rod springs are sleeved outside each pull rod, and the pull rod springs are arranged between the step surfaces of the pull rods and the measuring main rod in a propping mode so as to apply elastic force in the vertical direction.
Further, the hole roundness measuring apparatus according to the present invention further includes:
the pressure plate is sleeved on the measuring main rod and is arranged above the pull rod;
the pressure plate spring is sleeved on the measuring main rod and is arranged between the pressure plate and the radial extending arm of the measuring main rod in a propping way.
Further, in the hole roundness measuring device, the first measuring guide rod is provided with a step surface; the first measuring guide rod spring is sleeved on the periphery of the first measuring guide rod and is arranged between the step surface of the first measuring guide rod and the pressure plate in a propping way.
Further, in the hole roundness measuring device, the second measuring guide rod is provided with a step surface; the second measuring guide rod spring is sleeved on the periphery of the second measuring guide rod and is arranged between the step surface of the second measuring guide rod and the pressure plate in a propping way.
Further, in the hole roundness measuring device, a pressure plate handle is arranged on the pressure plate.
Further, in the hole roundness measuring device of the present invention, the top of the tie rod is hemispherical.
Compared with the prior art, the measuring device for the roundness of the hole has the following advantages and beneficial effects:
the measuring device provided by the invention can be used for quickly and accurately measuring the roundness error of the cylinder hole at one time through reasonable structural design. The measuring device has the advantages of simple structure, simple and convenient maintenance, high measuring precision and convenient use, can directly read out the roundness error of the hole on the dial indicator, and has very good popularization prospect and application value.
In certain preferred embodiments, the measuring device of the present invention may be provided with a parallelogram linkage arrangement to enable quick and accurate positioning of the measuring device. The parallelogram connecting rod structure with the pressure plate and the pull rod can control radial contraction so as to contract the parallelogram connecting rod structure before being placed into a cylinder hole to be tested, and the parallelogram connecting rod structure automatically expands radially under the action of the elastic element after being placed into the cylinder hole.
Drawings
FIG. 1 shows a schematic diagram of the prior art operation of measuring cylinder bore circularity in both longitudinal and transverse directions with an inside diameter dial gauge.
Fig. 2 is a schematic structural view of the hole roundness measuring apparatus according to the present invention at a view angle in one embodiment.
FIG. 3 is a schematic view of the hole roundness measuring apparatus according to the present invention at another view angle in one embodiment.
Fig. 4 is a schematic structural view of a hole roundness measuring apparatus according to the present invention under still another view angle in an embodiment.
Fig. 5 is an enlarged schematic view of a portion of the structure shown in fig. 4 at a.
FIG. 6 is a schematic front view of the hole circle measuring device according to the present invention in an embodiment.
Fig. 7 is a B-B cross-sectional view of the structure shown in fig. 6.
Fig. 8 is a C-C cross-sectional view of the structure shown in fig. 6.
Fig. 9 is an enlarged schematic view of a portion of the structure shown in fig. 8 at D.
Detailed Description
The hole roundness measuring device according to the present invention will be further explained and illustrated with reference to the drawings and specific examples, but the explanation and illustration do not constitute undue limitations on the technical solution of the present invention.
Fig. 2 is a schematic structural view of the hole roundness measuring apparatus according to the present invention at a view angle in one embodiment.
FIG. 3 is a schematic view of the hole roundness measuring apparatus according to the present invention at another view angle in one embodiment.
Fig. 4 is a schematic structural view of a hole roundness measuring apparatus according to the present invention under still another view angle in an embodiment.
As can be seen in conjunction with fig. 2, 3 and 4, in this embodiment, the measuring device according to the present invention may include: the measuring main rod 1, the dial indicator bracket 3, the dial indicator 4, the measuring block 5, the first measuring guide rod 6 and the second measuring guide rod 7.
Correspondingly, as can be seen from further reference to fig. 2 and 3, in the present embodiment, the measuring device of the present invention further includes three sets of planar four-bar mechanisms 2, and the three sets of planar four-bar mechanisms 2 are independent from each other and spaced 120 degrees apart from each other, and are all connected to the measuring boom 1.
In the invention, the three groups of plane four-bar mechanisms 2 connected with the measuring main bar 1 can ensure that the axis of the measuring main bar 1 in the measuring device is parallel to the wall of the hole to be measured, thereby realizing the auxiliary positioning of the measuring device and ensuring that the axis of the measuring device is parallel to the axis of the hole to be measured.
In the present embodiment, the parallel four-bar mechanism 2 may include: a pull rod 201, a first short rod 202, a long rod 203 and a second short rod 204. Wherein the tie rod 201 and the long rod 203 are vertically arranged, and the first short rod 202 and the second short rod 204 are laterally arranged. In the present invention, the middle part of the first short rod 202 is hinged with the lower end of the pull rod 201, one end of the first short rod 202 is hinged with the measuring main rod 1, the upper end of the long rod 203 is hinged with the other end of the first short rod 204, one end of the second short rod 204 is hinged with the lower end of the long rod 203, the other end of the second short rod 204 is hinged with the measuring main rod 1, and the pulling of the pull rod 201 in the vertical direction changes the radial distance between the measuring main rod 1 and the long rod 203.
In addition, in this embodiment, two supporting nails 2031 with equal height are disposed on each long rod 203 of the planar four-bar mechanism 2, which can be correspondingly installed in the holes of the long rod 203, and the two supporting nails 2031 can change the line contact between the long rod 203 and the hole wall to be measured into two-point contact, so as to eliminate the influence of the straightness of the hole to be measured on the auxiliary positioning of the measuring device.
Further, referring to fig. 3, in this embodiment, the tie rods 201 in the planar four-bar mechanism 2 are further provided with step surfaces 205, and each tie rod 201 is sleeved with a tie rod spring 206. Wherein the tie rod spring 206 can be arranged in abutment between the step surface 205 of the tie rod 201 and the measuring boom 1 to exert an elastic force in the vertical direction.
Correspondingly, in the present embodiment, the measuring main rod 1 of the measuring device is further sleeved with a pressure plate 8 and a pressure plate spring 9, and the pressure plate 8 is arranged above the pull rod 201 and can move up and down along the length direction of the measuring main rod 1; accordingly, the pressure plate spring 9 is disposed in abutment between the pressure plate 8 and the radially projecting arm 101 of the measuring boom 1.
In order to facilitate the operation of pressing down the platen 8 by the operator, a platen handle 801 is further provided on the platen 8 according to the present invention.
As can be seen further with reference to fig. 4, and in combination with reference to fig. 3, in this embodiment, a step surface 10 is further provided on each of the first measuring guide 6 and the second measuring guide 7 according to the present invention. In the invention, a first measuring guide rod spring 11 is sleeved on the periphery of a first measuring guide rod 6 and is arranged between a step surface 10 of the first measuring guide rod 6 and a pressure plate 8 in a propping way; the second measuring guide spring 12 can likewise be arranged around the second measuring guide 7 and can be arranged against the second measuring guide 7 between the stepped surface 10 and the pressure plate 8.
Fig. 5 is an enlarged schematic view of a portion of the structure shown in fig. 4 at a.
As shown in fig. 5, in the present embodiment, the dial indicator 4 is provided on the dial indicator holder 3, and the measuring block 5 can be brought into contact with the gauge head 401 of the dial indicator 4.
FIG. 6 is a schematic front view of the hole circle measuring device according to the present invention in an embodiment.
Fig. 7 is a B-B cross-sectional view of the structure shown in fig. 6.
Fig. 8 is a C-C cross-sectional view of the structure shown in fig. 6.
As shown in fig. 6, 7 and 8, in the present embodiment, the lower end of the measuring boom 1 is provided with a first right-angle channel and a second right-angle channel (not shown in the drawings), wherein each right-angle channel includes a vertical channel 102 and a horizontal channel 103 that are connected to each other, and wherein the ports of the horizontal channels 103 are located on the outer circumferential wall of the measuring boom 1.
As can be seen further with reference to fig. 8, in this embodiment, the top of the tie rod 201 in the planar four-bar mechanism 2 of the measuring device of the present invention may be hemispherical.
It should be noted that, referring to fig. 6 and 8 in combination, in the measuring device according to the present invention, the first measuring guide rod 6 may be vertically disposed below the measuring block 5 and connected to the measuring block 5, and the lower end of the first measuring guide rod 6 may be inserted into the vertical channel 102 of the first right-angle channel in the measuring main rod 1. In the measuring device according to the invention, the second measuring guide 7 can likewise be arranged vertically below the dial indicator holder 3 and connected to the dial indicator holder 3, the lower end of the second measuring guide 7 being able to be inserted into the vertical channel 102 of the second right-angle channel.
Fig. 9 is an enlarged schematic view of a portion of the structure shown in fig. 8 at D.
As shown in fig. 9, and referring to fig. 4 in combination, in this embodiment, the measuring device of the present invention further includes: a measuring head 13 and a ball 14.
In this embodiment, the measuring device according to the present invention is provided with two measuring heads 13, and the two measuring heads 13 are respectively disposed at the ports of the horizontal channels 103 of the first right-angle channel and the second right-angle channel, and can be used for attaching to the inner wall of the hole to be measured.
It should be noted that, in the present invention, a plurality of balls 14 are provided, which are correspondingly disposed between each measuring head 13 and the tail end of the corresponding first measuring guide 6 or second measuring guide 7, so as to transfer the horizontal position of the measuring head 13 to the first measuring guide 6 and the second measuring guide 7 and convert the horizontal position into the vertical displacement of the first measuring guide 6 and the second measuring guide 7.
When the measuring device is used for measuring hole roundness, an operator can hold the measuring main rod 1 to press down the pressing plate 8, the pressing plate 8 presses down the three groups of plane four-bar mechanisms 2 against the action of the spring force of the pull rod spring 206, so that the three groups of plane four-bar mechanisms 2 deform to reduce the radial dimension, the three groups of plane four-bar mechanisms 2 are placed into a hole to be measured, then the pressing force on the pressing plate 8 is released, the pull rod 201 is lifted upwards by the three groups of plane four-bar mechanisms 2 under the action of the spring force of the pull rod spring 206, the three groups of plane four-bar mechanisms 2 deform to open the radial dimension, and the supporting nails 2031 arranged on the long rods 203 are supported on the inner wall of the hole to be measured, so that the auxiliary positioning of the measuring main rod 1 is completed.
At this time, the measuring head 13 is attached to the inner wall of the hole to be measured, the measuring head 13 is displaced at the horizontal position, and then the ball 14 is extruded, so that the ball 14 moves in the first right-angle channel and the second right-angle channel, and further the first measuring guide rod 6 and the second measuring guide rod 7 are driven to move in the vertical direction, the numerical value displayed by the dial indicator 4 is the difference value between the diameters of the hole to be measured transversely and longitudinally, and further the error of the roundness of the hole is directly read.
In summary, the measuring device provided by the invention can be used for quickly and accurately measuring the roundness error of the cylinder hole at one time through reasonable structural design. The measuring device has the advantages of simple structure, convenient maintenance, high measuring precision and convenient use, and has very good popularization prospect and application value.
It should be noted that the combination of the technical features in the present invention is not limited to the combination described in the claims or the combination described in the specific embodiments, and all the technical features described in the present invention may be freely combined or combined in any manner unless contradiction occurs between them.
It should also be noted that the above-recited embodiments are merely specific examples of the present invention. It is apparent that the present invention is not limited to the above embodiments, and similar changes or modifications will be apparent to those skilled in the art from the present disclosure, and it is intended to be within the scope of the present invention.
Claims (8)
1. A device for measuring hole circularity, comprising:
the measuring main rod is provided with a first right-angle channel and a second right-angle channel at the lower end, wherein each right-angle channel comprises a vertical channel and a horizontal channel which are mutually connected, and a port of the horizontal channel is positioned on the outer circumferential wall of the measuring main rod;
a dial indicator bracket;
the dial indicator is arranged on the dial indicator bracket;
a measuring block which is in contact with a measuring head of the dial indicator;
a first measuring guide rod vertically arranged below the measuring block and connected with the measuring block, the measuring guide rod
The lower end of the first measuring guide rod is inserted into a vertical channel of the first right-angle channel;
the second measuring guide rod is vertically arranged below the dial indicator bracket and is connected with the dial indicator bracket, and the lower end of the second measuring guide rod is inserted into the vertical channel of the second right-angle channel;
the measuring heads are respectively arranged at the ports of the horizontal channels of the first right-angle channel and the second right-angle channel and are used for being attached to the inner wall of the hole to be measured;
the plurality of ball beads are correspondingly arranged between each measuring head and the tail ends of the corresponding first measuring guide rod and the corresponding second measuring guide rod, so that the horizontal positions of the measuring heads are transmitted to the first measuring guide rod and the second measuring guide rod and converted into vertical displacement of the first measuring guide rod and the second measuring guide rod;
at least three planar four-bar linkages each connected with the measuring boom, wherein each of the planar four-bar linkages comprises: the pull rods are vertically arranged, step surfaces are arranged on the pull rods, pull rod springs are sleeved outside each pull rod, and the pull rod springs are arranged between the step surfaces of the pull rods and the measuring main rod in a propping mode so as to apply elastic force in the vertical direction; the middle part of the first short rod is hinged with the lower end of the pull rod, and one end of the first short rod is hinged with the measuring main rod; the upper end of the long rod is hinged with the other end of the first short rod; one end of the second short rod is hinged with the lower end of the long rod, and the other end of the second short rod is hinged with the measuring main rod; the pulling of the pull rod in the vertical direction changes the radial distance between the main measuring rod and the long rod.
2. The hole roundness measuring apparatus of claim 1, wherein the long rod is provided with a support pin.
3. The hole roundness measuring apparatus of claim 2, wherein at least two support pins are provided on each of the long rods.
4. The hole roundness measurement device according to claim 1, further comprising:
the pressure plate is sleeved on the measuring main rod and is arranged above the pull rod;
the pressure plate spring is sleeved on the measuring main rod and is arranged between the pressure plate and the radial extending arm of the measuring main rod in a propping way.
5. The hole roundness measuring apparatus of claim 4, wherein the first measuring guide bar is provided with a stepped surface; the first measuring guide rod spring is sleeved on the periphery of the first measuring guide rod and is arranged between the step surface of the first measuring guide rod and the pressure plate in a propping way.
6. The hole roundness measuring apparatus of claim 4, wherein the second measuring guide bar is provided with a stepped surface; the second measuring guide rod spring is sleeved on the periphery of the second measuring guide rod and is arranged between the step surface of the second measuring guide rod and the pressure plate in a propping way.
7. The hole roundness measuring apparatus of claim 4, wherein a platen handle is provided on the platen.
8. The hole roundness measuring apparatus of claim 1, wherein the top of the tie rod is hemispherical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110441329.1A CN113983906B (en) | 2021-04-23 | 2021-04-23 | Hole roundness measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110441329.1A CN113983906B (en) | 2021-04-23 | 2021-04-23 | Hole roundness measuring device |
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| Publication Number | Publication Date |
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| CN113983906A CN113983906A (en) | 2022-01-28 |
| CN113983906B true CN113983906B (en) | 2023-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110441329.1A Active CN113983906B (en) | 2021-04-23 | 2021-04-23 | Hole roundness measuring device |
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| CN (1) | CN113983906B (en) |
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| WO1988008511A1 (en) * | 1987-04-27 | 1988-11-03 | Gordon Richard T | Method of and an apparatus for checking out-of-roundness |
| US5117081A (en) * | 1991-04-01 | 1992-05-26 | Armco Inc. | Roll roundness measuring and machining apparatus and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1150092A3 (en) * | 2000-04-12 | 2001-11-07 | Bidwell Corporation | Gage set for measuring ring shaped parts |
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| JPS57124201A (en) * | 1981-01-27 | 1982-08-03 | Nippon Kokan Kk <Nkk> | Measuring device for out of roundness of tube |
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| US5117081A (en) * | 1991-04-01 | 1992-05-26 | Armco Inc. | Roll roundness measuring and machining apparatus and method |
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| CN111121600A (en) * | 2019-12-31 | 2020-05-08 | 广德锦汭轴承有限公司 | Detection tool for detecting diameter of auxiliary screw nut raceway of ball screw for automobile |
| CN111412821A (en) * | 2020-04-13 | 2020-07-14 | 宁波真格液压科技有限公司 | New energy automobile brake drum processing device |
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