CN1119644C - Elastic element rigidity testing instrument - Google PatentsElastic element rigidity testing instrument Download PDF
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- CN1119644C CN1119644C CN 01105717 CN01105717A CN1119644C CN 1119644 C CN1119644 C CN 1119644C CN 01105717 CN01105717 CN 01105717 CN 01105717 A CN01105717 A CN 01105717A CN 1119644 C CN1119644 C CN 1119644C
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- elastic element
- flexible member
- testing instrument
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 17
- 230000000007 visual effect Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000003068 static Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 230000003287 optical Effects 0.000 description 3
- 208000008425 Protein Deficiency Diseases 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
The present invention relates to a rigidity testing instrument for an elastic element. A loading mechanism is composed of a drive motor and a piezoelectric device which are connected in series, specified loads are exerted to the elastic element continuously under the control of a computer, and a high precision force testing sensor is adopted to detect exerted load capacity; a CCD video camera and an image measurement technology are adopted to detect the displacement quantity of the elastic element, and the rigidity of the elastic element is obtained through processing by the computer. The present invention can realize full automatic positioning loading and continuous loading and improve detection efficiency greatly. The present invention is suitable for the static rigidity testing of various elastic elements and has wide application prospects.
The present invention relates to a kind of elastic element rigidity testing instrument, relate in particular to a kind of tester that utilizes computer control all automatic measurement elastic element rigidity, belong to the static rigidity field of measuring technique.
Rigidity is the of paramount importance characterisitic parameter of flexible member.Traditional static rigidity method of testing is to adopt standard test weight to load on the flexible member relevant detection point position by special mechanism, and the deformation displacement amount of flexible member is measured by dial gauge or optical mirror, obtains rigidity value by hand computation then.A kind of " camera spring rate tester " (number of patent application: 87215484) of proposing of Hangzhou Photographic Machinery Research Institute for example, adopt pure physical construction, counterweight with known quality, the gravity that produces at place, the known heavy field of force, being applied to tested spring gets on, use pointer---scale pair or vernier---the scale pair demonstrates the deflection of spring, by formula just can calculate the rigidity of miniature torsion spring or miniature extension spring.There are the following problems for this method: loading method and load maintainer are unreasonable, are easy to generate the load error; When adopting dial gauge to detect displacement, owing to have bigger ergometry, thereby influence the size of real load; When adopting optical mirror to detect the deformation displacement amount, the catoptron own wt will cause the flexible member distortion, so rigidity detects inaccurate; Manual operations loads the inefficiency of counterweight and hand computation method, very flexible, and test result is unreliable, and is with a low credibility; The rigidity test of single-point can only be carried out, continuous curve can't be obtained.
The objective of the invention is to above-mentioned deficiency, propose a kind of new general elastic element rigidity testing instrument, realize high-precision full-automatic testing, satisfy the actual production demand at prior art.
For realizing such purpose, the present invention is in technical scheme, the tester of design comprises load maintainer, force cell, ccd image measuring system and computer control part, under computer control, apply predetermined load to flexible member continuously by load maintainer, adopt the high precision force cell to detect the magnitude of load that applies, and adopt ccd video camera and image measurement technology to detect the displacement of flexible member, obtain the rigidity of flexible member by Computer Processing.
Load maintainer of the present invention is composed in series by drive motor and piezoelectric device, drive motor is used for fast moving load bar in the idle motion, piezoelectric device is used for the loading procedure micro-stepping and drives load bar, thereby solves the fast moving and the contradiction of micrometric displacement on a large scale among a small circle.Tested flexible member is fixed on the slide type worktable by special anchor clamps, load maintainer applies little power load by load bar to flexible member under the control of computing machine, the size of loaded load is detected by the high precision force cell, sensor is installed between load bar and the load maintainer, form the form of connecting with load maintainer, guarantee the accuracy of the load capacity of surveying.Ccd video camera picked-up flexible member edge contour image carries out non-contact detecting to the deformation displacement of flexible member, obtains the deformation displacement amount of flexible member by Flame Image Process.Load maintainer and ccd image measuring system are subjected to the unified control of computing machine, load capacity and displacement are imported computing machine simultaneously, by computing machine centralized control load maintainer and ccd image measuring system, obtain the stiffness curve of flexible member by continuous loading and detection, all testing processes are finished under the control of computing machine automatically.
Test table adopts skateboard structure, and is equipped with adjusting mechanism, and its present position can be adjusted flexibly, can change tested flexible member easily, and guarantees accurately to measure.Tested flexible member is fixed on the test table by unit clamp, and different flexible members can be selected different anchor clamps installations and fixing for use, thereby realizes the stiffness measurement of difformity and different size flexible member.
For understanding technical scheme of the present invention better, describe in further detail below in conjunction with accompanying drawing.
Fig. 1 is that system of the present invention constitutes synoptic diagram.
As shown in the figure, tested flexible member 1 is fixed on the slide type test table 3 by special anchor clamps 2, test table 3 is equipped with adjusting mechanism 4, and force cell 6 is connected between load bar 5 and the load maintainer 7, and load bar 5 and ccd video camera 8 are aimed at flexible member 1.
Under the control of computing machine, the drive motor of load maintainer 7 applies little power load by 5 pairs of flexible members 1 of load bar, institute adds the load size and is detected by force cell 6, meanwhile, the deformation displacement of 8 pairs of flexible members 1 of ccd video camera detects, load capacity and displacement are imported computing machine simultaneously, handle by computer data, obtain the rigidity of tested flexible member.Measurement result is shown on the display with graphics mode, and can store simultaneously and print.Then, workpiece is rotated 180 °, repeat said process, carry out reverse rigidity test.Whole testing process is to finish under the control of computing machine fully, so measuring instrument has higher robotization and intelligent degree.
Fig. 2 loads the structure front view of measuring mechanism for the present invention.
Fig. 3 loads the structure vertical view of measuring mechanism for the present invention.
Fig. 4 loads the structure side view of measuring mechanism for the present invention.
Such as Fig. 2, Fig. 3, shown in Figure 4, tested flexible member 1 is fixed on slide type work by anchor clamps 2 On the platform 3, load maintainer is composed in series by drive motors 12 and piezoelectric device 11, and drive motors 12 is by passing Actuation mechanism 9 promotes load bar 5 and moves, to tested flexible member 1 imposed load. Load bar 5 and driver Force cell 6 is arranged between the structure 9, and force cell 6 is connected between load bar 5 and the load maintainer, adds Carry bar 5 over against tested flexible member 1. Ccd video camera 8 is aimed at flexible member 1, and another side is furnished with light source 10.
Load maintainer is driven by drive motors 12, be subjected to the computer control of system, can realize load bar Quick-speed large-scale moves. Piezoelectric device 11 is subjected to computer control equally, can realize the accurate location of load bar Load and continuously loading the loading procedure full automation. The magnitude of load that load maintainer applies detected element Measured by force cell 6, force cell 6 is cascaded structure with load bar 5, can execute by Measurement accuracy The magnitude of load that adds. The deformation displacement that tested flexible member produces under load is by high accuracy CCD Video camera 8 measuring systems detect. Under the irradiation of light source 10, the image of tested flexible member 1 is logical Cross special-purpose optics lens imaging on the image planes of video camera. When load maintainer to tested flexible member imposed load The time, deformed element produces displacement, video camera is the image of continuous sampling detected element, by image processing and Calculate, finally obtain the deformation displacement amount. CPU is by computer, display, printer, interface The compositions such as circuit.
When changing tested flexible member 1, worktable 3 can be pulled out, thus handled easily.For different detected element 1, can change the accurate measurement that different anchor clamps 2 are realized rigidity by selecting for use, adaptability is strong.
The present invention adopts the tandem load maintainer, the fast moving and the contradiction of micrometric displacement have on a large scale among a small circle been solved, load maintainer is subjected to the computer control of system, can realize that the location loads and loads continuously, the loading procedure full automation improves detection efficiency greatly, improves load precision and accuracy, and loading is big or small and scope can arbitrarily be adjusted, and is flexible.The present invention is rational in infrastructure, the control simple possible, be applicable to the static rigidity test of various flexible members, for example the pipe spring of electrohydraulic servo valve, feedback rod, instrument sheet spring, elastic rod, bellows, flexible hinge in the precision optical machinery, elastic bearing, spring, corrugated tube, and other flexible member or the like, be with a wide range of applications.
1, a kind of elastic element rigidity testing instrument, it is characterized in that comprising load maintainer (7), force cell (6), ccd image measuring system and computer control part, load maintainer is composed in series by drive motor (12) and piezoelectric device (11), tested flexible member (1) is fixed on the test table (3) by anchor clamps (2), force cell (6) is connected between load bar (5) and the load maintainer, load maintainer is detected by force cell (6) the load that flexible member (1) applies by load bar (5), ccd video camera (8) carries out non-contact detecting to the deformation displacement of flexible member (1), load maintainer and ccd image measuring system are subjected to the unified control of computing machine, and load capacity and displacement are imported computing machine simultaneously and handled.
2,, it is characterized in that test table (3) is a skateboard structure, and be equipped with adjusting mechanism (4) as the said elastic element rigidity testing instrument of claim 1.
3,, it is characterized in that the difference of the visual tested flexible members of said anchor clamps (2) (1) and select to change as the said elastic element rigidity testing instrument of claim 1.
Priority Applications (1)
|Application Number||Priority Date||Filing Date||Title|
|CN 01105717 CN1119644C (en)||2001-03-22||2001-03-22||Elastic element rigidity testing instrument|
Applications Claiming Priority (1)
|Application Number||Priority Date||Filing Date||Title|
|CN 01105717 CN1119644C (en)||2001-03-22||2001-03-22||Elastic element rigidity testing instrument|
|Publication Number||Publication Date|
|CN1308228A CN1308228A (en)||2001-08-15|
|CN1119644C true CN1119644C (en)||2003-08-27|
Family Applications (1)
|Application Number||Title||Priority Date||Filing Date|
|CN 01105717 Expired - Fee Related CN1119644C (en)||2001-03-22||2001-03-22||Elastic element rigidity testing instrument|
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|CN (1)||CN1119644C (en)|
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- 2001-03-22 CN CN 01105717 patent/CN1119644C/en not_active Expired - Fee Related
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