CN103604351A - Measurement instrument used for weathering stripping depth of short cylindrical stone historical relic and measurement method - Google Patents

Measurement instrument used for weathering stripping depth of short cylindrical stone historical relic and measurement method Download PDF

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Publication number
CN103604351A
CN103604351A CN201310602357.2A CN201310602357A CN103604351A CN 103604351 A CN103604351 A CN 103604351A CN 201310602357 A CN201310602357 A CN 201310602357A CN 103604351 A CN103604351 A CN 103604351A
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China
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measurement
bent plate
weathering
plate
stone cultural
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CN201310602357.2A
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CN103604351B (en
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孙亚丽
杨志法
李丽慧
廖小辉
方建平
傅燕
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Quzhou University
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Quzhou University
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Abstract

The invention relates to a measurement instrument used for the weathering stripping depth of a short cylindrical stone historical relic and a measurement method of the measurement instrument. The measurement instrument comprises a measurement bent plate and a dial indicator, wherein the measurement bent plate is matched with the dial indicator for use, the dial indicator comprises a dial plate, a shaft neck, a measurement rod and a measurement head, the measurement head is arranged at the foremost end, the measurement rod, the shaft neck and the dial plate are sequentially located behind the measurement head, the measurement bent plate is in a cylindrical shape, a plurality of measurement holes are formed in the measurement bent plate, the lower edge of the measurement bent plate is fixedly connected with a supporting structure, the lower end of the supporting structure is fixedly connected with a short anchor rod buried underground, a measurement support is fixed to the shaft neck, and the outer surface of the measurement support is a circular arc curved surface which is concave inwards. The measurement instrument has the advantages of being high in measurement precision, field adaptive capacity and measurement point density, accurate in positioning of measurement points and the like.

Description

Measurement instrument and measuring method for the short cylindrical shape stone cultural artifact weathering off degree of depth
 
Technical field
The present invention relates to a kind of measurement instrument and measuring method thereof for the short cylindrical shape stone cultural artifact rock surface weathering off degree of depth.
Background technology
For all kinds of stone cultural artifacts (comprising short cylindrical shape stone cultural artifact); rock surface because of the degree of depth of peeling off that weathering produces be the large problem that historical relic's protection worker and engineering geology scientific researcher are concerned about because the surperficial weathering off degree of stone cultural artifact and correlative study thereof are by the long-term protection problem relating to by the stone cultural artifact that ancient times, craftsman manufactured.Consider that drum type brake weathering off degree of depth measurement instrument of the present invention designs for short cylindrical shape stone cultural artifact, need to be illustrated for the example of this class stone cultural artifact: in many stone cultural artifacts of China, there is a class to there is the stone cultural artifact of short cylindrical shape appearance, its historical relic is worth often very high, such as being collected stone lamp stand (see figure 1) in the Confucian temple of south, Quzhou City, Zhejiang Province etc.Should be understood that owing to protecting for a long time the concern of problem less to above-mentioned short cylindrical shape stone cultural artifact in the past; so the prior art that relevant this class stone cultural artifact weathering off degree of depth measures both at home and abroad seldom; but still need to sketch wherein available prior art and disabled similar techniques, to deepen the demonstration to the background of instrument proposition of the present invention.
If with regard to the standing crop survey technology that only peels off the degree of depth with regard to the rock decay of stone cultural artifact surface, the horizontal stripe cellular type draw point that can lift as shown in Figure 2 measures method and orifice plate type rock surface roughness mechanical measuring apparatus as shown in Figure 3.The former is a kind of measuring equipment that peels off depth design that Sancho etc. causes because of long-term weathering for measuring Spain's somewhere sandstone surface: they have installed 6 horizontal stripe (see figure 2)s in the same plane on vertical rack, allows the opposite planar of outside surface composition of each horizontal stripe.In addition, be evenly distributed 10 gaging holes in every horizontal stripe, pitch of holes is 50mm, to determine exactly the position of measuring point in tested plane.The area that these gaging holes cover is about 0.165m 2.During measurement, deviser will be with that graduated draw point is vertical to be inserted in above-mentioned these gaging holes, to measure the relative level distance between the tested measuring point that each horizontal stripe outside surface touched to draw point top.According to each gaging hole relative position in the plane and the relative level distance being measured by each gaging hole, determining the weathering off degree of depth of each measuring point rock surface again, is definite foundation that provides of depth of weathering.According to author's experience, the measurement sensitivity of the method can be higher than 0.5mm.This method for measurement according to one's analysis, advantage is directly perceived, convenient, but has 3 weak points at least: the first, draw point measurement accuracy is on the low side.Be no matter in theory or actually measure above, the measurement accuracy of described draw point insertion method will be lower than its sensitivity 0.5mm, and this is obviously on the low side for the rock surface weathering off degree of depth; The second, by being difficult to, guarantee that 6 horizontal stripes installing are in together in a plane, and this not enough measurement accuracy that will likely further reduce; The 3rd, if mishandling, when the horizontal stripe of 6 measurement use is set, be easy to cause measurand---the damage of historical relic.The latter is a kind of measuring equipment (see figure 3) that Zhang Zhongjian etc. designs in order to measure Quzhou and the Pingyao Old City Wall rock building block weathering off degree of depth.The advantage of this quasi-instrument is measurement accuracy higher (its sensitivity and precision reach respectively 0.1mm and 0.03mm), and convenient data processing etc., but being also that both sides area is too little, the area of the sheet glass that maximum shortcoming is it to be adopted (is conventionally no more than 0.1m 2), be difficult to be suitable for the measurement object that area is larger.But also need to point out, above-mentioned these two kinds can be used for the technology that the weathering off degree of depth measures, and can only be suitable for the measurement object that appearance global shape is essentially plane, but still can not be for the Correlated Case with ARMA Measurement of the stone cultural artifact that is short cylindrical shape of indication of the present invention.Relevant these two kinds of summaries that perhaps can be described as similar techniques, can help us further to understand the technical background that this invention proposes, it is investigated and as the standing crop survey technology that can be used for the stone cultural artifact weathering off degree of depth of short cylindrical shape, mainly contain the impression technique of soft-plastic material.The people such as Yang Zhifa once adopted the soft-plastic material through special processing---and plasticine carries out die to the stone cultural artifacts such as ancient stone tablet of Handan Xiang Tangsi, to measure the weathering off degree of depth of relevant stone tablet.This technology also can be used for the measurement of the local weathering off degree of depth of above-mentioned short cylindrical shape stone cultural artifact (the stone lamp stand of example south, Quzhou Confucian temple as shown in Figure 1).Actual measurement shows, this technology is to have easy and simple to handlely, measure low cost and other advantages, but weak point also has 2 points: the first measurement accuracy not high (conventionally not higher than 0.5mm); The second, once measure that related measuring surface is very little (is no more than 20cm conventionally 2), otherwise will further reduce measurement accuracy.Just because of the related measuring surface of this kind of method is conventionally very little, so be both applicable to the weathering off degree of depth measurement that integral surface is shaped as the stone cultural artifact of plane, also can be used for the corresponding measurement that integral surface is shaped as above-mentioned cylindrical shape stone cultural artifact, but for the latter, be difficult to the measurement of the cylindrical shape stone cultural artifact integral surface weathering off degree of depth.
By above analysis, can be found out, be sought after inventing a kind of instrument that the various cylindrical shape stone cultural artifact rock surface weathering off degree of depth measure that is specifically designed to.So measurement of the present invention to as if be the weathering off degree of depth of circular arc rock surface of the stone cultural artifact of short cylindrical shape.According to domestic and international existing correlation technique investigation, think that this petition proposes the drum type brake weathering off degree of depth measurement instrument measuring for the short cylindrical shape stone cultural artifact rock surface weathering off degree of depth be the new technology proposing.
Summary of the invention
In view of the needs that are the weathering off degree of depth of circular arc rock surface of the stone cultural artifact of short cylindrical shape and measure, the present invention proposes a kind of drum type brake weathering off degree of depth measurement instrument and method for measurement thereof of the weathering off degree of depth of the circular arc rock surface that can be used for short cylindrical shape stone cultural artifact.
The present invention is achieved by the following technical solutions: comprise and measure bent plate and dial gauge, described measurement bent plate and dial gauge are used in conjunction with each other, described dial gauge comprises dial plate, axle journal, measuring staff, gauge head, described gauge head is foremost, measuring staff, axle journal, dial plate successively backward, described measurement bent plate is cylindrical, on described measurement bent plate, offer some gaging holes, the lower limb of described measurement bent plate is fixedly connected with supporting construction, described supporting construction lower end is fixedly connected with the short anchor pole that is embedded in ground, on described axle journal, fixing survey held in the palm, the outside surface of described survey holder is the arc-shaped surface of indent.
As preferably, described supporting construction comprises clamping plate, coupling bolt, the upper end of described clamping plate arranges mounting hole, described upper mounting hole is connected with the bent plate mounting hole that measures the setting of bent plate lower limb by set bolt, described clamping plate bottom is divided and is offered narrow groove, the coupling bolt tack of described coupling bolt inserts narrow groove, and the lower end of described clamping plate arranges lower mounting hole, and described lower mounting hole is connected with the mounting hole arranging on coupling bolt tack by set bolt.
As preferably, described supporting construction has 3, is 120 ° between adjacent supports structure.
As preferably, between described gauge head and measuring staff, connect some extension bars, the mode that adopts screw thread to compress between described extension bar connects.
As preferably, measuring bent plate is columnar poly (methyl methacrylate) plate.
As preferably, described gaging hole is in a row evenly distributed.
The measuring method of described measurement instrument, comprises step 1, by measuring bent plate, is enclosed within stone cultural artifact to be measured and is fixed on ground by supporting construction, guarantees to measure bent plate vertical central axis consistent with the vertical central axis of stone cultural artifact; Step 2, inserts the measuring staff of dial gauge the gaging hole that measures bent plate, makes to survey holder and measure bent plate to fit; Step 3, holds out against by the gauge head of dial gauge the point that tested stone cultural artifact is predicted, reads the data of the dial plate of dial gauge, record; Step 4, measures each gaging hole successively, obtains one group of data, and the tested stone cultural artifact weathering off degree of depth is learnt in machine analysis as calculated.
The present invention is a kind of drum type brake mechanical measuring apparatus (see figure 4) designing for the measurement of above-mentioned this class short cylindrical shape stone cultural artifact rock surface weathering off degree of depth specially.Domestic and international prior art described in technical background one joint of its instructions part relevant to the present invention is compared, have the following advantages: (1) is owing at home and abroad can be used in the various existing method of the stone cultural artifact rock surface weathering off degree of depth except soft-plastic material impression technique, substantially be all need and design for the measurement with the stone cultural artifact on plane body surface, so these technology (example technology as shown in Figures 2 and 3) in principle can not be for the measurement of cylindrical stone cultural artifact, and new this technology proposing is more suitable for this class and measures specially because having taken into full account the short cylindrical shape profile of measurand.About the measurement accuracy problem of new proposition technology, due to this technology used be one through transformation dial gauge, the measurement instrument measuring accuracy higher (estimation can reach 0.05mm) that the technology is used, far above the precision of above-mentioned soft-plastic material impression technique; (2) measuring point is to utilize to be embedded in the short anchor pole on measurand peripheral ground and to be distributed in the gaging hole that cartridge type measures on bent plate to position, and the gauge head of dial gauge just injects gaging hole, and holds out against measuring point and can not move, and has improved the positioning precision of measured point; (3) with regard to the adaptive faculty of field measurement, the on-the-spot adaptive faculty of instrument of the present invention is stronger, and the cost of instrument is also lower.Wherein main parts size (measuring bent plate etc. such as the dial gauge through transformation and cylindrical shape) is reusable; (4) because this measuring equipment is to adopt the special survey seat of the compositions such as short anchor pole that critical piece cylindrical shape measurement bent plate is maintained static, but dismounting easily (install while measuring, pull down while not measuring, make on-the-spot 3 the short anchor poles of imbedding earth's surface that tightly stay).So allow regularly the weathering off degree of depth of historical relic to be carried out to timely monitor, and accordingly this stone cultural artifact is made more accurately and being estimated in the rate of weathering under specific environment, this is that the method shown in Fig. 3 and above-mentioned soft-plastic material impression technique are difficult to accomplish.
It is high that the present invention has measurement accuracy, and on-the-spot adaptable, measuring point accurate positioning and site density are compared with advantages of higher.
Accompanying drawing explanation
Fig. 1 is the stone lamp stand (being positioned at south, Quzhou Confucian temple) of short cylindrical shape stone cultural artifact Typical Representative;
Fig. 2 is the scene photograph that the employing horizontal stripe cellular type draw point measurement methods such as Sancho measure Spain's somewhere sandstone weathering off degree of depth;
Fig. 3 is a national inventing patent technology-orifice plate type rock surface roughness mechanical measuring apparatus of the developments such as Zhang Zhongjian;
Fig. 4 is the vertical view of the embodiment of the present invention;
Fig. 5 is the cut-open view of the embodiment of the present invention;
Fig. 6 is the structural representation of dial gauge of the present invention;
Fig. 7 is the expansion schematic diagram (noting: in figure, boundary line, left and right AB is the same line) that cylindrical shape measures bent plate;
Fig. 8 is the structural representation of clamping plate;
Fig. 9 is the structural representation of coupling bolt.
In figure, 1 is shallow bore hole, the 2nd, and mortar, the 3rd, short anchor pole, the 4th, coupling bolt, the 5th, ground, the 6th, coupling bolt tack, the 7th, clamping plate, the 8th, set bolt, the 9th, hold-doun nut, the 10th, measure bent plate, the 11st, stone lamp stand, the 12nd, gauge head, the 13rd, extension bar, the 14th, measuring staff, the 15th, axle journal, the 16th, survey holder, the 17th, dial plate, the 18th, gaging hole, the 19th, bent plate mounting hole, the 20th, upper mounting hole, the 21st, narrow groove, the 22nd, lower mounting hole, the 23rd, mounting hole.
Embodiment
The present invention is further illustrated in conjunction with the embodiments to contrast accompanying drawing below.
Embodiment 1, a kind of measurement instrument for the short cylindrical shape stone cultural artifact weathering off degree of depth, mainly comprise that cylindrical shape measures bent plate 10, dial gauge, supporting construction, cylindrical shape measures bent plate 10 and is used in conjunction with each other with dial gauge, measuring bent plate 10 is columnar poly (methyl methacrylate) plate, cylindrical shape measures on bent plate 10 and offers some gaging holes 18, and gaging hole 18 is in a row evenly distributed.Supporting construction comprises clamping plate 7, coupling bolt 4(selects the coupling bolt being of convenient length), the upper end of clamping plate 7 arranges mounting hole 20, upper mounting hole 20 is connected with the bent plate mounting hole 19 that measures bent plate 10 lower limb settings by set bolt 8, clamping plate 7 bottoms are divided and are offered narrow groove 21, the coupling bolt tack 6 of coupling bolt 4 inserts narrow groove 21, the lower end of clamping plate 7 arranges lower mounting hole 22, lower mounting hole 22 is connected with the mounting hole 23 arranging on coupling bolt tack 6 by set bolt 8, in the present embodiment, supporting construction has 3, between adjacent supports structure, being 120 ° (is corresponding clamping plate 7, respectively 3 of coupling bolts 4, set bolt 8 couplings such as grade increase), coupling bolt 4 is connected with the short anchor pole 3 being embedded on ground correct position (being that selected each position is substantially the same from the horizontal range of the vertical center axis of short cylindrical shape stone cultural artifact to be measured), and by means of them, the cylindrical shape measurement bent plate 10 being inserted in outside short cylindrical stone cultural artifact to be measured is fixed on the ground.The dial gauge that the present invention is 50mm to bought existing range is transformed, it comprises dial plate 17, axle journal 15, measuring staff 14, gauge head 12, in order further to improve the measurement accuracy of instrument, the survey holder 16 that utilizes glue the outside surface of stainless steel manufacture to be to the arc-shaped surface of indent is fixed in a part of length of axle journal 15 of dial gauge, and its remainder is exposed, in addition, can also be according to the position of concrete measuring point, increase extension bar 13, extension bar 13 can be one, two or many, the mode that adopts screw thread to compress between many extension bars 13 connects, and connecting length is identical while guaranteeing each measurement, the present embodiment 1 has connected an extension bar 13, gauge head 12 is foremost, extension bar 13, measuring staff 14, axle journal 15, dial plate 17 successively backward.
The installation process of this invention mainly comprises the following steps: the first step, and the short cylindrical shape stone cultural artifact for the treatment of measurement carries out geometric analysis, determines its rotational symmetry axle (through its upright wires of home position of circular level cross-sectionn); Second step, measures bent plate stretch-out view from cylindrical shape shown in Fig. 7, can find out that this measurement bent plate arranged many rows gaging hole and 3 groups (every group of 2 holes) 6 bent plate mounting holes.Between this 3 suite plate mounting hole, be respectively separated by 120 °; The 3rd step, by means of set bolt and hold-doun nut, and is installed on 3 clamping plate respectively on bent plate mounting hole by the upper mounting hole of clamping plate; The 4th step, measures bent plate by the cylindrical shape that 3 clamping plate are installed and is enclosed within on stone cultural artifact stone lamp stand to be measured, and makes its longitudinal axis of symmetry consistent with longitudinal axis of symmetry of stone cultural artifact; The 5th step, by means of set bolt and hold-doun nut, is connected 3 isometric coupling bolts with the lower mounting hole of clamping plate; The 6th step, according to the marginal position of determining cylindrical shape measurement bent plate, makes 3 coupling bolts at the particular location on ground, to bury short anchor pole underground; The 7th step, by means of jackhammer or manual grooving mode, at made each dozen of next shallow bore holes 1 on short anchor pole position of burying underground, and is embedded in 3 tapped short anchor poles in shallow bore hole respectively with mortar 2, and is fixed; The 8th step, measures and on bent plate, respectively to arrange lower limb that gaging hole, cylindrical shape measure bent plate height overhead according to being positioned at cylindrical shape, and the height of stone lamp stand detected part, 3 isometric coupling bolts that designated length is suitable; The 9th step, coupling bolt male thread is screwed in the box thread of short anchor pole, again coupling bolt tack is aimed to the lower mounting hole of clamping plate, allow coupling bolt tack insert exactly in narrow groove, make their coupling bolt mounting hole aim at the lower mounting hole on clamping plate, allow set bolt pass each mounting hole, then fix with hold-doun nut; If coupling bolt tack can not insert in narrow groove because of processing or alignment error exactly, or the lower mounting hole, the mounting hole on coupling bolt tack that insert rear plate can not in a straight line, can adopt the relation between coupling bolt and the box thread of short anchor pole of finely tuning before building mortar to solve.
During measurement, dial gauge gauge head, extension bar, measuring staff are inserted together in certain gaging hole of cylindrical shape measurement bent plate, make the exposed parts of dial gauge axle journal also insert this gaging hole, and make the arc surface curved surface of surveying holder be adjacent to the outside surface that cylindrical shape measures bent plate, allow gauge head hold out against certain measuring point of tested stone cultural artifact.In this state, the data that read from dial plate are the outside surface of cylindrical shape measurement bent plate to the relative distance tested stone lamp stand point.So, measure successively each gaging hole, can record one group of data.
Utilize special computer software (excel, sufer etc.) that the data that each gaging hole is surveyed are depicted as to measured object surface because of the degree of depth of weathering off.If desired, also can after a certain moment carry out identical measurement.In theory, for poor (a rear secondary data deducts last secondary data) of twice metric data of tested same measuring point, divided by the length of this twice time period, the average weathering speed of this period with regard to known this measuring point under residing microenvironment.
What more than enumerate is only specific embodiments of the invention, obviously, the invention is not restricted to above embodiment.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention, all should belong to protection scope of the present invention.

Claims (7)

1. the measurement instrument for the short cylindrical shape stone cultural artifact weathering off degree of depth, comprise and measure bent plate and dial gauge, described measurement bent plate and dial gauge are used in conjunction with each other, described dial gauge comprises dial plate, axle journal, measuring staff, gauge head, described gauge head is foremost, measuring staff, axle journal, dial plate successively backward, it is characterized in that, described measurement bent plate is cylindrical, on described measurement bent plate, offer some gaging holes, the lower limb of described measurement bent plate is fixedly connected with supporting construction, described supporting construction lower end is fixedly connected with the short anchor pole that is embedded in ground, on described axle journal, fixing survey held in the palm, the outside surface of described survey holder is the arc-shaped surface of indent.
2. the measurement instrument for the short cylindrical shape stone cultural artifact weathering off degree of depth according to claim 1, it is characterized in that, described supporting construction comprises clamping plate, coupling bolt, the upper end of described clamping plate arranges mounting hole, described upper mounting hole is connected with the bent plate mounting hole that measures the setting of bent plate lower limb by set bolt, described clamping plate bottom is divided and is offered narrow groove, the coupling bolt tack of described coupling bolt inserts narrow groove, the lower end of described clamping plate arranges lower mounting hole, and described lower mounting hole is connected with the mounting hole arranging on coupling bolt tack by set bolt.
3. the measurement instrument for the short cylindrical shape stone cultural artifact weathering off degree of depth according to claim 2, is characterized in that, described supporting construction has 3, is 120 ° between adjacent supports structure.
4. the measurement instrument for the short cylindrical shape stone cultural artifact weathering off degree of depth according to claim 1, is characterized in that, connects some extension bars between described gauge head and measuring staff, and the mode that adopts screw thread to compress between described extension bar connects.
5. the measurement instrument for the short cylindrical shape stone cultural artifact weathering off degree of depth according to claim 1, is characterized in that, measuring bent plate is columnar poly (methyl methacrylate) plate.
6. the measurement instrument for the short cylindrical shape stone cultural artifact weathering off degree of depth according to claim 1, is characterized in that, described gaging hole is in a row evenly distributed.
7. the measuring method of measurement instrument according to claim 1, it is characterized in that, step 1, is enclosed within stone cultural artifact to be measured and is fixed on ground by supporting construction measuring bent plate, guarantees to measure bent plate vertical central axis consistent with the vertical central axis of stone cultural artifact; Step 2, inserts the measuring staff of dial gauge the gaging hole that measures bent plate, makes to survey holder and measure bent plate to fit; Step 3, holds out against by the gauge head of dial gauge the point that tested stone cultural artifact is predicted, reads the data of the dial plate of dial gauge, record; Step 4, measures each gaging hole successively, obtains one group of data, and the tested stone cultural artifact weathering off degree of depth is learnt in machine analysis as calculated.
CN201310602357.2A 2013-11-25 2013-11-25 Measurement instrument and measuring method for short cylindrical shape stone cultural artifact weathering off depth Expired - Fee Related CN103604351B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2210380Y (en) * 1994-06-18 1995-10-18 刘根社 Multi parameter measuring frame for column roller
CN2240710Y (en) * 1995-09-08 1996-11-20 哈尔滨铁路分局哈尔滨车辆段 Depth tester for article surface defect
JP2006334299A (en) * 2005-06-06 2006-12-14 Nishikawa Sangyo Kk Human body dimension measuring method and device using pin slide device
CN101514885A (en) * 2009-03-30 2009-08-26 中国科学院地质与地球物理研究所 Orifice plate type rock surface roughness mechanical measuring apparatus
JP2012013561A (en) * 2010-07-01 2012-01-19 Yokohama Rubber Co Ltd:The Apparatus for measuring partial wear of tire
CN103162604A (en) * 2013-02-04 2013-06-19 长沙理工大学 Real-time testing device and real-time testing method of size deformation after cement based composite material hardening
CN203216434U (en) * 2013-05-15 2013-09-25 丹阳市万隆铸造有限公司 Meter used for measuring depth of step hole

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2210380Y (en) * 1994-06-18 1995-10-18 刘根社 Multi parameter measuring frame for column roller
CN2240710Y (en) * 1995-09-08 1996-11-20 哈尔滨铁路分局哈尔滨车辆段 Depth tester for article surface defect
JP2006334299A (en) * 2005-06-06 2006-12-14 Nishikawa Sangyo Kk Human body dimension measuring method and device using pin slide device
CN101514885A (en) * 2009-03-30 2009-08-26 中国科学院地质与地球物理研究所 Orifice plate type rock surface roughness mechanical measuring apparatus
JP2012013561A (en) * 2010-07-01 2012-01-19 Yokohama Rubber Co Ltd:The Apparatus for measuring partial wear of tire
CN103162604A (en) * 2013-02-04 2013-06-19 长沙理工大学 Real-time testing device and real-time testing method of size deformation after cement based composite material hardening
CN203216434U (en) * 2013-05-15 2013-09-25 丹阳市万隆铸造有限公司 Meter used for measuring depth of step hole

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