CN102818501B - Arc radius measuring device - Google Patents

Arc radius measuring device Download PDF

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Publication number
CN102818501B
CN102818501B CN2012102353899A CN201210235389A CN102818501B CN 102818501 B CN102818501 B CN 102818501B CN 2012102353899 A CN2012102353899 A CN 2012102353899A CN 201210235389 A CN201210235389 A CN 201210235389A CN 102818501 B CN102818501 B CN 102818501B
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main scale
chi
arc
dial indicator
piece
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CN102818501A (en
Inventor
张子明
陈延辉
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Pinggao Group Co Ltd
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Pinggao Group Co Ltd
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Abstract

The invention relates to an arc radius measuring device. Adjacent ends of transverse rods of two secondary rulers are mutually hinged with front ends of a main ruler through a main ruler shaft; centering mechanisms are respectively arranged at one end of each transverse rod far away from the main ruler; each centering mechanism comprises secondary ruler shafts extended along upper and lower directions axially, and a dial indicator base which is in rotational match with the secondary ruler shafts correspondingly; a dial indicator with a dial indicator measuring rod is installed on the dial indicator base; a secondary ruler measuring part in match and contact with an arc plane to be measured is arranged at the end part of one end of the dial indicator measuring rod far away from and corresponding to the dial indicator; a centering string block is further arranged on the dial indicator base; the centering string block is provided with string block centering parts which are distributed at two radial sides corresponding to the secondary ruler shafts and which are in contact match with the corresponding arc plane to be measured; a connecting line of centering parts of the two string blocks is vertically equally divided by a central line of the dial indicator measuring rod; and the central line of each vertical rod is respectively perpendicular to a connecting line of central lines of the main ruler shaft and corresponding secondary ruler shafts. The invention also provides the arc radius measuring device which can be used for accurately determining a circle center of an arc to be measured.

Description

A kind of arc radius measurement mechanism
Technical field
The present invention relates to a kind of measurement mechanism that is less than the arc radius of 1/2nd circumference for measuring length.
Background technology
The circular arc part that often there will be small semicircle on market, because the circular arc of these parts is less than semicircle, therefore need special measurer carry out radius measurement to it.Existing measurement mechanism as disclosed as Chinese patent CN 2081971U a kind of " inner arc radius measuring instrument ", this measuring instrument comprises main scale, secondary chi and adjusts secondary, secondary chi is for the circular arc center of circle in determining, main scale is for measuring inner arc radius, and adjustment is secondary for connecting, adjust, fix major and minor chi and indication reading value.Wherein secondary chi comprises crossfoot and perpendicular chi, and crossfoot has the spaced measurement rib point for contacting with arc surface to be measured, and perpendicular chi is vertically divided the line of 2 measurement rib points equally.During measurement, theorem according to " perpendicular bisector of circle string must pass through the center of circle ", the correspondence measurement rib point of two crossfoots is contacted with arc surface to be measured respectively, thereby determine the center of circle of arc surface to be measured, then by scale on main scale, treat the radius of surveying arc surface and measured.
The problem that existing measuring instrument exists is: when concrete measurement operation, need survey crew to locate respectively two secondary chis and main scale, measure labour intensity large, measuring process is loaded down with trivial details, at least will use plural operating personnel in the time of most of and be measured, cost of labor is higher, simultaneously, this employing is measured the rib point and is determined the center of circle, and then obtain the measurement form of arc radius, be theoretic feasible in fact, when concrete operations, basic being difficult to realized, because, the difficulty of processing of measuring rib point is very large, measure the rib point even process, after repeatedly using, measure rib point and also can be worn into cambered surface, and at the beginning of the making of montant, be vertically to divide two lines of measuring rib point equally, therefore the line that montant now out of plumb are divided two points that contact with circular arc to be measured on cross bar equally, therefore just there is deviation in the determined center of circle of secondary chi with the true center of circle of circular arc to be measured, finally cause measurement result inaccurate.
Summary of the invention
The object of the present invention is to provide a kind of arc radius measurement mechanism that can accurately determine the center of circle of circular arc to be measured.
In order to address the above problem, technical scheme of the present invention is:
A kind of arc radius measurement mechanism, comprise main scale and a left side, right secondary chi, each secondary chi includes cross bar and the montant be solid-located, the front end end of described main scale is provided with the main scale measurement section coordinated for contacting with arc surface to be measured, the abutting end of the cross bar of described two secondary chis is hinged and connected by main scale axle and the main scale front end axially extended along the vertical direction, described each cross bar is equipped with concentric mechanism away from an end of described main scale, concentric mechanism comprises the secondary chi axle axially extended along the vertical direction and the dial indicator holder be rotatably assorted with corresponding secondary chi axle, dial gauge with dial gauge sounding rod is installed on described dial indicator holder, described dial gauge sounding rod is provided with away from an end end of corresponding dial gauge the secondary chi measurement section coordinated for contacting with arc surface to be measured, on described dial indicator holder, also be provided with the heartstrings piece, described have the radially both sides that are distributed in corresponding secondary chi axle and for contacting the string piece that coordinates with corresponding arc surface to be measured to heart section to the heartstrings piece, the center line of described dial gauge sounding rod is vertically divided the line of described two string pieces to heart section equally, the center line of described each montant is vertically divided respectively the center line line of main scale axle and corresponding secondary chi axle equally.
Described each to the heartstrings piece along the axially directed slidable fit of corresponding dial gauge sounding rod on corresponding dial indicator holder, described corresponding dial indicator holder with top between the heartstrings piece is furnished with to the heartstrings piece being applied towards away from the elastic component of corresponding dial gauge direction thrust, on described dial indicator holder, also be provided with to the reply spacing cooperation of heartstrings piece to the heartstrings piece towards away from corresponding dial gauge direction, moving spacing position limiting structure.
Described elastic component consists of torsion spring.
Described position limiting structure comprises the backing pin that is arranged in corresponding dial indicator holder and is arranged at the slotted hole on reply heartstrings piece, and it is peripheral and have a hole wall with the spacing cooperation of corresponding backing pin that described slotted hole is sheathed on corresponding backing pin.
Described main scale measurement section, secondary chi measurement section chord piece form by corresponding arcwall face heart section.
There is sliding sleeve the rear end of described main scale along main scale length direction guiding slidable fit, be rotatably equipped with the first pivoted housing and the second pivoted housing on described sliding sleeve, offer the first through hole passed for the montant rear end of left secondary chi in described the first pivoted housing, offer the second through hole passed for the montant rear end of right secondary chi in described the second pivoted housing.
Described sliding sleeve is provided with the threaded hole that runs through the one side, in described threaded hole, is threaded to be useful on to slide on main scale the sliding sleeve set nut that while sliding, sliding sleeve is carried out locking positioning.
Described the first pivoted housing and the second pivoted housing all are arranged on the sliding sleeve of described main scale below, on described sliding sleeve, in the top of described main scale, are provided with the press strip with the press strip scale, and described main scale is provided with the main scale scale that coordinates reading with described press strip scale.
The rear end of described main scale also is provided with adjustment component, the arc radius measurement mechanism also comprises adjusts screw, screw mechanism, screw in described adjustment screw, screw mechanism is arranged on described adjustment component, and leading screw and described sliding sleeve in described adjustment screw, screw mechanism are in transmission connection.
Described adjustment component on described main scale, also is provided with the adjustment component set nut that adjustment component is carried out locking positioning when described adjustment component guiding is slided along fore-and-aft direction guiding slidable fit between described main scale and described adjustment component.
Beneficial effect of the present invention is: during measurement, first by table block to dial gauge to zero, when zero process is made to the dial gauge zero graduation, the secondary chi measurement section of each concentric mechanism and corresponding two string pieces to heart section above the circular arc identical with arc surface radius to be measured, then the main scale measurement section of main scale and arc surface to be measured are adjacent to, the string piece of each concentric mechanism is adjacent to heart section and arc surface to be measured, and rotate adjustment to the heartstrings piece being advanced to shape, when the reading of dial gauge is zero, illustrate that each two string pieces corresponding to the heartstrings piece have just formed a string of arc surface to be measured to the contact point line of heart section and arc surface to be measured, now the center line bearing of trend of dial gauge sounding rod is crossed the center of circle of arc surface to be measured, vertically divide the montant of main scale axle and secondary chi axle line equally and just also cross the center of circle of arc surface to be measured, the intersection location of such two montants has just been determined the home position of arc surface to be measured, thereby can measure accurately the radius of arc surface to be measured.Montant of the present invention is the center line line of vertically dividing main scale axle and secondary chi axle equally at the beginning of making, and not there will be the deviation of measurement in long-term use procedure; By using the center of circle of the center line of heartstrings piece assurance dial gauge sounding rod being crossed to arc surface to be measured, further guarantee that the center line of montant is crossed the center of circle.
The accompanying drawing explanation
Fig. 1 is the structural representation of embodiment in the present invention;
Fig. 2 is the structural representation of cross bar in Fig. 1;
Fig. 3 is the B place enlarged drawing in Fig. 1;
Fig. 4 is the A place enlarged drawing in Fig. 1;
Fig. 5 is the rear view of Fig. 4;
Fig. 6 is the D place enlarged drawing in Fig. 5;
Fig. 7 is the schematic diagram that coordinates of cross bar and chord-foot seat in Fig. 5;
Fig. 8 is measuring principle schematic diagram of the present invention;
Fig. 9 is the structural representation of montant in Fig. 1;
Figure 10 is the vertical view of Fig. 9;
Figure 11 is the structural representation of main scale in Fig. 1;
Figure 12 is the structural representation of low sleeve part in Fig. 6;
Figure 13 is the vertical view of Figure 12;
Figure 14 is the structural representation of upper sliding sleeve part in Fig. 6;
Figure 15 is the vertical view of Figure 14;
Figure 16 is the structural representation of concentric mechanism seat in Fig. 1;
Figure 17 is that the E of Figure 16 is to cut-open view;
Figure 18 is the structural representation of chord-foot seat in Fig. 1;
Figure 19 is that the C of Figure 18 is to cut-open view;
Figure 20 is the structural representation of cross bar in Fig. 1;
Figure 21 is to the structural representation of heartstrings piece in Fig. 1;
Figure 22 is the side view of Figure 21.
Embodiment
A kind of embodiment of arc radius measurement mechanism is as shown in Fig. 1 ~ 22: comprise main scale 9, adjust secondary and be arranged at left secondary chi 4 and the right secondary chi 8 of main scale 9 left and right sides, the front end end of main scale 9 is provided with for contact the main scale measurement section of cooperation with arc surface 5 to be measured.Each secondary chi includes cross bar 6 and montant 3, montant 3 is fixedly linked with cross bar 6 by jackscrew 12 and trimming pin 11, the abutting end of the cross bar 6 of two secondary chis all is fixed with chord-foot seat 7 by cross bar nut 13, and main scale axle 28 and main scale 9 front ends that each chord-foot seat 7 all extends along the vertical direction by pivot center are hinged and connected.Each cross bar 6 is equipped with concentric mechanism away from an end of main scale 9, and concentric mechanism comprises and is arranged at the secondary chi axle 51 axially extended along the vertical direction on corresponding cross bar 6 and the dial indicator holder 16 be rotatably assorted with corresponding secondary chi axle 51.Dial gauge 10 with dial gauge sounding rod is installed on dial indicator holder 16, the dial gauge sounding rod is provided with away from an end of corresponding dial gauge 10 the secondary chi measurement section 21 coordinated for contacting with arc surface 5 to be measured, on dial indicator holder 16, be provided with for corresponding, table block 15 being coordinated and dial gauge is carried out to the curved portions to zero, on dial indicator holder 16, also be provided with heartstrings piece 14, heartstrings piece 14 is had respectively at the radially both sides of the secondary chi axle 51 of correspondence and for contacting the string piece that coordinates with corresponding arc surface 5 to be measured to heart section 19, the center line of dial gauge sounding rod is vertically divided the line of corresponding two string pieces to heart section 19 equally, each to heartstrings piece 14 along the axially directed slidable fit of corresponding dial gauge sounding rod on corresponding dial indicator holder 16, corresponding dial indicator holder 16 with top between heartstrings piece 14 is furnished with to heartstrings piece 14 being applied to the elastic component of court away from corresponding dial gauge 10 direction thrusts, elastic component consists of torsion spring 22, on dial indicator holder 16, also be provided with to reply heartstrings piece 14 spacing cooperations to heartstrings piece 14 towards away from corresponding dial gauge 10 directions, moving spacing position limiting structure, position limiting structure comprises the backing pin 18 be arranged in corresponding dial indicator holder 16 and is arranged at the slotted hole on reply heartstrings piece 14, it is peripheral and have a hole wall with corresponding backing pin 18 spacing cooperations that slotted hole is sheathed on corresponding backing pin 18.The center line of each montant 3 is vertically divided the line of main scale axle 28 and corresponding secondary chi axle 51 equally, and main scale measurement section, secondary chi measurement section chord piece form by corresponding arcwall face heart section.
Adjust secondary comprising along main scale 9 length directions and lead slidable fit in the sliding sleeve 1 of main scale 9 rear ends, sliding sleeve 1 comprises upper and lower spiral-lock low sleeve part 1-1 and upper sliding sleeve 1-2 part together.Sliding sleeve 1 is provided with the threaded hole that runs through its right side, in threaded hole, is threaded to be useful on to slide on main scale the sliding sleeve set nut that while sliding, sliding sleeve is carried out locking positioning.Being rotatably equipped with the first pivoted housing 24 and the second pivoted housing 25, the first pivoted housings 24 and the second pivoted housing 25 in the downside of main scale on sliding sleeve is arranged on sliding sleeve by the first compressing tablet 26 and the second compressing tablet 27.Offer the first through hole passed for montant 3 rear ends of left secondary chi 4 in the first pivoted housing 24, offer the second through hole passed for the montant rear end of right secondary chi 8 in the second pivoted housing 25.Upside in main scale on sliding sleeve 1 is provided with the press strip 30 with the press strip scale, and main scale 9 is provided with the main scale scale that coordinates reading with the press strip scale.The rear end of main scale 1 also is provided with adjustment component 29, the arc radius measurement mechanism also comprises adjusts screw, screw mechanism, the screw 32 of adjusting in screw, screw mechanism is arranged on adjustment component 29, the leading screw 31 of adjusting in screw, screw mechanism is in transmission connection with sliding sleeve 1, adjustment component 29 on main scale 9, also is provided with the adjustment component set nut that adjustment component 29 is carried out locking positioning when described adjustment component guiding is slided along fore-and-aft direction guiding slidable fit between main scale 9 and described adjustment component 29.
During concrete the measurement, according to the size of workpiece, select suitable secondary chi to install on main scale 9, use the curved portions that table block 15 concave surfaces is adjacent to dial indicator holder, the extrados of curved portions and arc surface to be measured 5 are tangent.10 pairs zero of dial gauges, after 10 pairs zero of dial gauges, the secondary chi measurement section of each concentric mechanism and corresponding two string pieces to heart section above the circular arc identical with arc surface radius to be measured, take down table block 5, sliding sleeve 1 is adjusted to the position that is slightly larger than workpiece, again the summit of the main scale of main scale 9 location cambered surface and the arc surface to be measured 5 of workpiece for measurement are adjacent to, screw 32 on adjustment component 29 rotates, leading screw 31 promotes sliding sleeve 1 and moves forward, the montant 3 that drives secondary chi rotates relative to main scale axle 28 with cross bar 6, the montant 3 of secondary chi can rotate and can slide in corresponding pivoted housing relative to main scale 9, when the indicator of two dial gauges 10 adjusts to zero, at this moment the reading on main scale 9 is exactly the radius size of this workpiece for measurement.The effect of dial gauge is can record when secondary chi measurement section rigidly connects tactile arc surface to be measured (due to the problem of feel, if only with dial indicator holder contact measured arc surface, will produce certain error) relative position of main scale and secondary chi, the position that the dial gauge sounding rod stretches out should be on the curved portions of dial indicator holder, so consistent to the curved portions radius of the radius of the concave surface of table block and dial indicator holder.Certainly this is just wherein a kind of comparatively especially to zero form, in other embodiments of the invention, the curved portions of dial indicator holder can not established yet, can have identically with arc surface internal diameter to be measured to table block by adopting one, make the inner concave of table block is contacted zero heart section with two corresponding string pieces with the secondary chi measurement section of dial gauge sounding rod to zero the time.The measuring principle of the present embodiment is as shown in Figure 8: can see G, 2 contact points for secondary chi measurement section and corresponding arc surface to be measured of F in figure, the contact point that the H point is main scale measurement section and corresponding arc surface to be measured; X, 2 axis that represent respectively corresponding secondary chi axle of Z, the Y point represents the axis of main scale axle; OS and OK represent respectively the center line of the montant of left and right secondary chi.OS vertically divides XY equally, and OK vertically divides YZ equally, and G, H, 3 place circles of F are concentric circles with X, Y, 3 place circles of Z, and when the center line of dial gauge sounding rod is crossed the center of circle of arc surface to be measured, the center line of each montant also can be crossed the center of circle of arc surface to be measured.
In other embodiments of the invention: each montant can also one set firmly or be fixedly connected with by being welded to connect with corresponding cross bar; Concentric mechanism seat chord rod support all can not have, now cross bar can be directly and main scale be hinged and connected, dial indicator holder also can directly rotate and be assemblied on cross bar; Sliding sleeve can not have yet, and now adjusts pair and can comprise the slotted hole be opened on each montant and main scale and be arranged at the measurement pin in slotted hole; Torsion spring can also be replaced by post spring or folded spring; The limited step that position limiting structure can also be arranged on dial indicator holder replaces.

Claims (9)

1. an arc radius measurement mechanism, comprise main scale and a left side, right secondary chi, each secondary chi includes cross bar and the montant be solid-located, the front end end of described main scale is provided with the main scale measurement section coordinated for contacting with arc surface to be measured, it is characterized in that: the abutting end of the cross bar of described two secondary chis is hinged and connected by main scale axle and the main scale front end axially extended along the vertical direction, described each cross bar is equipped with concentric mechanism away from an end of described main scale, concentric mechanism comprises the secondary chi axle axially extended along the vertical direction and the dial indicator holder be rotatably assorted with corresponding secondary chi axle, dial gauge with dial gauge sounding rod is installed on described dial indicator holder, described dial gauge sounding rod is provided with away from an end end of corresponding dial gauge the secondary chi measurement section coordinated for contacting with arc surface to be measured, on described dial indicator holder, also be provided with the heartstrings piece, described have the radially both sides that are distributed in corresponding secondary chi axle and for contacting the string piece that coordinates with corresponding arc surface to be measured to heart section to the heartstrings piece, the center line of described dial gauge sounding rod is vertically divided the line of described two string pieces to heart section equally, the center line of described each montant is vertically divided respectively the center line line of main scale axle and corresponding secondary chi axle equally, described each to the heartstrings piece along the axially directed slidable fit of corresponding dial gauge sounding rod on corresponding dial indicator holder, described corresponding dial indicator holder with top between the heartstrings piece is furnished with to the heartstrings piece being applied towards away from the elastic component of corresponding dial gauge direction thrust, on described dial indicator holder, also be provided with to the reply spacing cooperation of heartstrings piece to the heartstrings piece towards away from corresponding dial gauge direction, moving spacing position limiting structure.
2. arc radius measurement mechanism according to claim 1, it is characterized in that: described elastic component consists of torsion spring.
3. arc radius measurement mechanism according to claim 1, it is characterized in that: described position limiting structure comprises the backing pin that is arranged in corresponding dial indicator holder and is arranged at the slotted hole on reply heartstrings piece, and it is peripheral and have a hole wall with the spacing cooperation of corresponding backing pin that described slotted hole is sheathed on corresponding backing pin.
4. arc radius measurement mechanism according to claim 1 is characterized in that: described main scale measurement section, secondary chi measurement section chord piece form by corresponding arcwall face heart section.
5. according to the described arc radius measurement mechanism of claim 1~4 any one, it is characterized in that: there is sliding sleeve the rear end of described main scale along main scale length direction guiding slidable fit, be rotatably equipped with the first pivoted housing and the second pivoted housing on described sliding sleeve, offer the first through hole passed for the montant rear end of left secondary chi in described the first pivoted housing, offer the second through hole passed for the montant rear end of right secondary chi in described the second pivoted housing.
6. arc radius measurement mechanism according to claim 5, it is characterized in that: described sliding sleeve is provided with the threaded hole that runs through the one side, in described threaded hole, is threaded to be useful on to slide on main scale the sliding sleeve set nut that while sliding, sliding sleeve is carried out locking positioning.
7. arc radius measurement mechanism according to claim 5, it is characterized in that: described the first pivoted housing and the second pivoted housing all are arranged on the sliding sleeve of described main scale below, be provided with the press strip with the press strip scale in the top of described main scale on described sliding sleeve, described main scale is provided with the main scale scale that coordinates reading with described press strip scale.
8. arc radius measurement mechanism according to claim 5, it is characterized in that: the rear end of described main scale also is provided with adjustment component, the arc radius measurement mechanism also comprises adjusts screw, screw mechanism, screw in described adjustment screw, screw mechanism is arranged on described adjustment component, and leading screw and described sliding sleeve in described adjustment screw, screw mechanism are in transmission connection.
9. arc radius measurement mechanism according to claim 8, it is characterized in that: described adjustment component on described main scale, also is provided with the adjustment component set nut that adjustment component is carried out locking positioning when described adjustment component guiding is slided along fore-and-aft direction guiding slidable fit between described main scale and described adjustment component.
CN2012102353899A 2012-07-09 2012-07-09 Arc radius measuring device Active CN102818501B (en)

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CN102818501B true CN102818501B (en) 2013-12-11

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103727861A (en) * 2012-10-10 2014-04-16 张瑞强 Circular arc radius measuring ruler
CN105423861B (en) * 2015-10-30 2018-08-28 安徽省宣城市乾坤回转支承有限公司 A kind of special elbow formula interior rollaway nest measuring scale
CN111735364B (en) * 2020-08-17 2020-11-13 广东电网有限责任公司东莞供电局 Electric power heavy-calibre pipeline size measurement device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU805056A1 (en) * 1978-12-11 1981-02-15 Минский Завод "Ударник" Device for dimension monitoring
CN2081971U (en) * 1990-08-19 1991-07-31 邓超云 Radius gauge for internal circular arc
CN101979954A (en) * 2010-10-25 2011-02-23 南车戚墅堰机车有限公司 Measuring tool for measuring arc parts

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU805056A1 (en) * 1978-12-11 1981-02-15 Минский Завод "Ударник" Device for dimension monitoring
CN2081971U (en) * 1990-08-19 1991-07-31 邓超云 Radius gauge for internal circular arc
CN101979954A (en) * 2010-10-25 2011-02-23 南车戚墅堰机车有限公司 Measuring tool for measuring arc parts

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