CN112066933A - Three-point contact type internal tooth span measuring device and measuring method - Google Patents
Three-point contact type internal tooth span measuring device and measuring method Download PDFInfo
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- CN112066933A CN112066933A CN202010855912.2A CN202010855912A CN112066933A CN 112066933 A CN112066933 A CN 112066933A CN 202010855912 A CN202010855912 A CN 202010855912A CN 112066933 A CN112066933 A CN 112066933A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000523 sample Substances 0.000 claims description 16
- 238000002788 crimping Methods 0.000 claims description 13
- 210000003781 tooth socket Anatomy 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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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
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/16—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring distance of clearance between spaced objects
Abstract
The invention discloses a three-point contact type internal tooth span measuring device and a measuring method, wherein the measuring device comprises a differential head and a mounting bracket; the differential head is a digital display differential head and comprises a body, a micrometric screw rod which is arranged in the body and extends forwards, and an operating handle which is arranged at the rear end of the body, wherein a movable measuring head is arranged at the front end of the micrometric screw rod; the installing support includes consecutive first linkage segment, second linkage segment and fixed gauge head module, the front end fixed connection of first linkage segment and body, and the micrometer screw rod of differential head passes first linkage segment forward, and the second linkage segment sets up in one side of differential head, and fixed gauge head module is located the rear of action handle, and fixed gauge head module is equipped with two fixed gauge heads of parallel arrangement, and fixed gauge head is from the outside protruding extension of rear end face of fixed gauge head module. The movable measuring head and the two fixed measuring heads are in three-point contact with a surface to be measured for measurement, the automatic centering device has the characteristics of automatic centering, unique position and good stability, and the accuracy of measurement is ensured.
Description
Technical Field
The invention relates to the technical field of length measuring tools, in particular to a three-point contact type internal tooth span measuring device and a measuring method.
Background
The pin gear shell is a main component part on the RV reducer, and the structure of the part is similar to that of an internal tooth straight gear. The novel gear reducer is also one of the parts with high precision and the largest processing difficulty in the gear reducer parts; the precise control of the span dimension of the internal teeth is particularly important in the production process of the part. At present, three-coordinate measuring instruments or tooth profile measuring instruments are generally used for measuring internal tooth spans in the industry, and although the two measuring instruments can realize accurate measurement, the two measuring instruments are not suitable for on-machine detection in a processing field. In a processing field, two measuring rods are commonly arranged in opposite tooth sockets in the industry, and a micrometer is used for measuring the distance between the two measuring rods to obtain an internal tooth span value. The method is not convenient and fast enough to detect, the operation is time-consuming, and the efficiency is low; and the accurate measuring point is difficult to find during operation, the requirement on the proficiency of an operator is high, human factors greatly influence the measuring result, and certain accumulated errors exist in indirect measurement. Therefore, the prior art is not suitable for measurement in high-precision occasions and has low efficiency.
Disclosure of Invention
The invention aims to provide a three-point contact type internal tooth span measuring device which is simple to operate and high in detection precision.
Another object of the present invention is to provide a method for measuring an internal tooth span with high measurement accuracy.
In order to achieve the first purpose, the invention provides the following technical scheme:
a three-point contact type internal tooth span measuring device comprises a differential head and a mounting bracket; the differential head is a digital display differential head and comprises a body, a micrometric screw rod which is arranged in the body and extends forwards, and an operating handle which is arranged at the rear end of the body, wherein a movable measuring head is arranged at the front end of the micrometric screw rod; the mounting bracket comprises a first connecting section, a second connecting section and a fixed measuring head module which are sequentially connected, the first connecting section is fixedly connected with the front end of the body, a micrometer screw of the differential head forwards penetrates through the first connecting section, the second connecting section is arranged on one side of the differential head, the fixed measuring head module is located behind the operating handle, the fixed measuring head module is provided with two fixed measuring heads which are arranged in parallel, and the fixed measuring head module extends outwards from the rear end face of the fixed measuring head module in a protruding mode.
As a further preferable scheme, the rear end of the second connecting section is fixedly connected with the fixed measuring head module through a screw.
As a further preferable scheme, the movable measuring head is connected with the front end of the micrometer screw through a connecting cap.
As a further preferred scheme, the connecting cap includes a first sleeve ring and a second sleeve ring arranged on the front side of the first sleeve ring, the first sleeve ring is fixed to the front end of the micrometer screw, and the second sleeve ring is sleeved on the movable measuring head and is in threaded connection with the periphery of the first sleeve ring.
As a further preferable scheme, the operating handle is provided with a central shaft, a ratchet wheel and an outer sleeve ring; the center shaft rotates to drive the micrometer screw to stretch, the ratchet is sleeved with the center shaft and fixed with the center shaft, and the outer sleeve ring is arranged on the periphery of the ratchet and provided with a crimping device for elastically crimping the periphery of the ratchet.
As a further preferable scheme, the outer wall of the outer collar is provided with anti-slip lines.
As a further preferable scheme, the movable measuring head and the fixed measuring head are in a cemented carbide spherical structure.
As a further preferred scheme, the operating handle comprises a middle shaft, a return spring, a first ratchet wheel, a second ratchet wheel and an outer sleeve; the middle shaft comprises a large-diameter section and a small-diameter section extending backwards from the large-diameter section, and the first ratchet wheel is sleeved with the small-diameter section in a relatively moving manner along the axial direction of the middle shaft and is fixed with the small-diameter section in the circumferential direction; a first ratchet is arranged on the rear side surface of the first ratchet wheel; the return spring is abutted against the large-diameter section and the front end of the first ratchet wheel; the second ratchet wheel is positioned behind the first ratchet wheel and rotatably sleeved with the small-diameter section, a second ratchet matched with the first ratchet is arranged on the front side of the second ratchet wheel, and the outer sleeve is rotatably sleeved with the small-diameter section and fixed with the second ratchet.
In order to achieve the second purpose, the invention provides the following technical scheme:
a measuring method based on the three-point contact type internal tooth span measuring device comprises the following steps:
s1, selecting a fixed measuring head module suitable for the size and range of the workpiece, and fixing the fixed measuring head module to the mounting bracket;
s2, placing the measuring device between two reference grooves of the standard gauge, and tightly attaching the end points of the two fixed measuring heads to one of the reference grooves;
s3, rotating the operating handle to push the micrometer screw, making the movable measuring head contact with another reference groove until the operating handle makes continuous sound, and reading the differential head at the moment is the span of two reference grooves of the standard gauge;
s4, clearing the reading, taking out the span measuring device and putting the span measuring device into a workpiece to be measured, and tightly attaching the end points of the two fixed measuring heads to one tooth socket to be measured of the workpiece to be measured;
s5, rotating the operating handle to push the micrometer screw, making the movable measuring head contact with the other tooth socket of the workpiece to be measured until the operating handle makes continuous sound, and reading the readings. The reading at this point is the deviation of the span of two teeth of the workpiece from the theoretical value.
Compared with the prior art, the invention has the following beneficial effects:
1. the measuring device has the advantages of simple structure, good rigidity, easy operation of the measuring method and suitability for field processing process measurement.
2. The movable measuring head and the two fixed measuring heads are in three-point contact with a surface to be measured for measurement, the automatic centering device has the characteristics of automatic centering, unique position and good stability, and the accuracy of measurement is ensured.
3. The operating handle is provided with a ratchet wheel type force measuring mechanism, so that the measurement is accurate and the repeatability is good.
4. The measuring head is detachably arranged on the device, can measure the span of the internal teeth in the RV reducer pin gear shell and the cycloid gear shell with various specifications, can also be used for measuring the span of a standard internal gear, and has certain universality.
5. The measuring method adopts a comparison type measurement, eliminates absolute value errors caused by different operation habits of operators, and better ensures the accuracy of measured data.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a front view of a three-point contact type internal tooth span measuring apparatus in embodiment 1;
FIG. 2 is a schematic view showing a connection mode of a micrometer screw and a movable probe in example 1;
FIG. 3 is a cross-sectional view A-A of FIG. 1;
FIG. 4 is a schematic diagram of a structure of a master gauge of the present invention;
FIG. 5 is a state diagram of the three-point contact internal tooth span measuring device of the present invention in use;
FIG. 6 is a schematic view of another perspective of FIG. 5;
FIG. 7 is a schematic view of a three-point contact type internal tooth span measuring apparatus in embodiment 2;
FIG. 8 is a partial enlarged view of the position B in FIG. 7;
in the figure: differential head-1; a body-11; micrometer screw-12; a connecting cap-121; a first set of rings-1211; a second collar-1212; an operating handle-13; a central axis-131; ratchet-132; ratchet-1321; an outer collar-133; -a crimping device-134; substrate-1341; a spring 1342; crimp-1343; a central axis-135; a large diameter section-1351; small diameter section-1352; a first ratchet 136; a second ratchet-137; an outer sleeve-138; a connecting portion-1381; an extension-1382; a return spring-139; a mounting bracket-2; a first connecting section-21; a second connecting section-22; a fixed measuring head module-23; a measuring head mounting hole-231; a movable measuring head-3; an annular projection-31; fixing the measuring head 4; a standard gauge 5; a reference groove 51; a workpiece 100 to be measured; the tooth slot to be measured 101.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "upper", "lower", "left", "right", "inner", "outer" and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, the present embodiment provides a three-point contact internal tooth span measuring device, which can be used to measure internal tooth spans of RV reducer pin gear cases and cycloid gear cases of various specifications, or to measure internal tooth spans of standard internal gears. The three-point contact type internal tooth span measuring device comprises a differential head 1 and a mounting bracket 2. Wherein, the differential head 1 includes body 11, install in body 11 and the micrometer screw 12 that stretches out forward and the operating handle 13 of setting in body 11 rear end, body 11 is equipped with the electronic display screen and conveniently reads the registration, operating handle 13 can rotate and drive around body 11 micrometer screw 12 is flexible from beginning to end. The front end of the micrometric screw 12 is provided with a movable measuring head 3, and the movable measuring head 3 is coaxial with the micrometric screw 12.
As shown in fig. 2, in this embodiment, the movable probe 3 is connected to the front end of the micrometer screw 12 through a connecting cap 121. The connecting cap 121 includes a first collar 1211 and a second collar 1212 disposed at the front side of the first collar 1211, the first collar 1211 is fixed to the front end of the micrometer screw 12 by a positioning pin, and the front side of the first collar 1211 is sleeved to the rear end of the movable probe 3. The movable probe 3 is provided with an annular projection 31. In the front-back direction, the annular protrusion 31 is clamped between a first collar 1211 and a second collar 1212, and the second collar 1212 is sleeved on the movable probe 3 and is in threaded connection with the outer periphery of the first collar 1211. When the movable measuring head 3 is replaced, the first sleeve 1211 can be rotated to take out the movable measuring head 3, and the operation is convenient.
As shown in fig. 1, the mounting bracket 2 is U-shaped, and includes a first connecting section 21, a second connecting section 22, and a fixed probe module 23 connected in sequence. The first connecting section 21 is fixedly connected with the front end of the body 11, and the micrometer screw 12 of the differential head 1 forwards penetrates through the through hole of the first connecting section 21; the second connecting section 22 and the first connecting section 21 are integrally connected and arranged on one side of the differential head 1, and the fixed measuring head module 23 is located behind the operating handle 13 and is locked and fixed with the second connecting section 22 through screws, so that the disassembly and assembly are convenient. The fixed measuring head module 23 is provided with two fixed measuring heads 4 which are arranged in parallel, and the fixed measuring heads protrude outwards from the rear end face of the fixed measuring head module 23. The central axis 131 of the fixed measuring head 4 is parallel to the central axis of the movable measuring head 3, and the connecting line of the rear end points of the two fixed measuring heads is perpendicular to the central axis 131 of the fixed measuring head. When measuring, fixed gauge head and activity gauge head 3 butt tooth's socket that awaits measuring respectively, two activity gauge heads 3 are three points and await measuring the stable contact of internal tooth with fixed gauge head, have the automatic centering characteristics, and the position is only, and stability is good.
In this embodiment, the fixed probe 4 is in a replaceable form, and the fixed probe module 23 is provided with a probe mounting hole 231, and the fixed probe is disposed in the corresponding probe mounting hole 231 and locked by a corresponding screw.
Referring to fig. 1 and 3, the operating handle 13 is provided with a central shaft 131, a ratchet wheel 132 and an outer collar 133. The central shaft 131 is used for rotationally driving the micrometer screw 12 to extend and retract, the ratchet wheel 132 is sleeved on the central shaft 131 and fixed with the central shaft 131, and ratchets 1321 are arranged on the periphery of the ratchet wheel. The outer ring 133 is arranged on the periphery of the ratchet wheel, the outer ring 133 is provided with a mounting hole, and a crimping device 134 for elastically crimping the periphery of the ratchet wheel is arranged in the mounting hole. The crimping device 134 comprises a base body 1341, a spring 1342 and a crimping piece 1343, the outer wall of the base body 1341 is fixed with the mounting hole through threads, an accommodating groove is formed in one side, close to the ratchet, of the base body 1341, the head of the crimping piece 1343 penetrates out of the accommodating groove, two ends of the spring 1342 are respectively abutted to the bottom wall of the accommodating groove and the crimping piece 1343, so that the head of the crimping piece 1343 is crimped with the ratchet, the crimping piece 1343 and the ratchet are matched to play a constant-pressure role during measurement, when the movable measuring head 3 and a corresponding tooth socket are extruded to a certain extent, the outer sleeve 133 is continuously screwed, the spring 1342 contracts, the outer sleeve 133 slides relative to the ratchet and makes a sound, the ratchet and the central shaft 131 do not rotate continuously, and the consistency. In this embodiment, the outer sidewall of the outer collar 133 is provided with anti-slip threads.
Further, the movable measuring head 3 and the fixed measuring head are in a hard alloy spherical structure.
Referring to fig. 4 to 6, in the present embodiment, the measurement method of the span measurement apparatus is as follows:
1. firstly, selecting a fixed measuring head module 23 suitable for the size and range of a workpiece, and fixing the fixed measuring head module 23 to the mounting bracket 2;
2. placing the measuring device between two grooves of the standard gauge 5, tightly attaching the end points of two fixed measuring heads to one reference groove 51, rotating the operating handle 13 to enable the movable measuring head 3 to contact the other reference groove 51 until the operating handle 13 makes continuous sound, wherein the measured distance is a theoretical value;
3. and (3) clearing the reading, taking out the span measuring device, putting the span measuring device into any opposite tooth socket 101 to be measured in the workpiece 100 to be measured, and contacting the three measuring points with the tooth socket surface to be measured by using the same method, wherein the reading is the deviation of the two-tooth span relative to the theoretical value.
The measuring device is in stable three-point contact with a measuring workpiece in the measuring process, the tooth socket has the characteristic of automatic centering, the measuring operation is simple and convenient, the precision is high, and the measuring device is more suitable for being used in a production field compared with a three-coordinate measuring instrument or a tooth profile measuring instrument.
Example 2
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A three-point contact type internal tooth span measuring device is characterized by comprising a differential head and a mounting bracket; the differential head is a digital display differential head and comprises a body, a micrometric screw rod which is arranged in the body and extends forwards, and an operating handle which is arranged at the rear end of the body, wherein a movable measuring head is arranged at the front end of the micrometric screw rod; the mounting bracket comprises a first connecting section, a second connecting section and a fixed measuring head module which are sequentially connected, the first connecting section is fixedly connected with the front end of the body, a micrometer screw of the differential head forwards penetrates through the first connecting section, the second connecting section is arranged on one side of the differential head, the fixed measuring head module is positioned behind the operating handle and detachably fixed with the second connecting section, the fixed measuring head module is provided with two fixed measuring heads which are arranged in parallel, and the fixed measuring head module is extended outwards in a protruding mode from the rear end face of the fixed measuring head module.
2. A three-point contact internal tooth span measuring device according to claim 1, wherein the rear end of the second connecting section is fixedly connected with the fixed probe module through a screw.
3. A three-point contact internal tooth span measuring device according to claim 1, wherein the movable probe is connected to the front end of the micrometer screw through a connecting cap.
4. A three-point contact internal tooth span measuring device according to claim 3, wherein the connecting cap includes a first collar fixed to the front end of the micrometer screw and a second collar disposed on the front side of the first collar, the second collar being fitted over the movable probe and threadedly coupled to the outer periphery of the first collar.
5. A three-point contact internal tooth span measuring device according to claim 1, wherein the operating handle is provided with a central shaft, a ratchet wheel and an outer collar; the center shaft rotates to drive the micrometer screw to stretch, the ratchet is sleeved with the center shaft and fixed with the center shaft, and the outer sleeve ring is arranged on the periphery of the ratchet and provided with a crimping device for elastically crimping the periphery of the ratchet.
6. A three-point contact internal tooth span measuring device according to claim 5, wherein the outer wall of the outer collar is provided with anti-slip threads.
7. A three-point contact internal tooth span measuring device according to claim 1, wherein the movable probe and the fixed probe are of cemented carbide spherical construction.
8. A three-point contact internal tooth span measuring device according to claim 1, wherein the operating handle comprises a middle shaft, a return spring, a first ratchet wheel, a second ratchet wheel and an outer sleeve; the middle shaft comprises a large-diameter section and a small-diameter section extending backwards from the large-diameter section, the small-diameter section is sleeved with the first ratchet wheel in a relatively moving manner along the axial direction of the middle shaft, and the first ratchet wheel is fixed with the small-diameter section in the circumferential direction; a first ratchet is arranged on the rear side surface of the first ratchet wheel; the return spring is abutted against the large-diameter section and the front end of the first ratchet wheel; the second ratchet wheel is positioned behind the first ratchet wheel and rotatably sleeved with the small-diameter section, a second ratchet matched with the first ratchet is arranged on the front side of the second ratchet wheel, and the outer sleeve is rotatably sleeved with the small-diameter section and fixed with the second ratchet.
9. A measuring method of a three-point contact type internal tooth span measuring apparatus according to any one of claims 1 to 8, comprising the steps of:
s1, selecting a fixed measuring head module suitable for the size and range of the workpiece, and fixing the fixed measuring head module to the mounting bracket;
s2, placing the measuring device between two reference grooves of the standard gauge, and tightly attaching the end points of the two fixed measuring heads to one of the reference grooves;
s3, rotating the operating handle to push the micrometer screw rod, so that the movable measuring head contacts with the other reference groove until the operating handle makes a continuous sound;
s4, clearing the reading, taking out the span measuring device and putting the span measuring device into a workpiece to be measured, and enabling the end points of the two fixed measuring heads to be tightly attached to one tooth socket to be measured of the workpiece to be measured;
s5, rotating the operating handle to push the micrometer screw, making the movable measuring head contact with the other tooth socket of the workpiece to be measured until the operating handle makes continuous sound, and reading the readings.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010855912.2A CN112066933A (en) | 2020-08-24 | 2020-08-24 | Three-point contact type internal tooth span measuring device and measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010855912.2A CN112066933A (en) | 2020-08-24 | 2020-08-24 | Three-point contact type internal tooth span measuring device and measuring method |
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| CN112066933A true CN112066933A (en) | 2020-12-11 |
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| CN202010855912.2A Pending CN112066933A (en) | 2020-08-24 | 2020-08-24 | Three-point contact type internal tooth span measuring device and measuring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116399197A (en) * | 2023-03-31 | 2023-07-07 | 杭州工具量具有限公司 | Multipurpose digital display inside micrometer |
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| CN207050593U (en) * | 2017-07-21 | 2018-02-27 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of 3 inside micrometers in measurable inner groove bottom footpath |
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2020
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| CN201527241U (en) * | 2009-11-03 | 2010-07-14 | 上海君丰科贸有限公司 | High-accuracy electronic digital-display internal measuring micrometer |
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Application publication date: 20201211 |
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