CN2750312Y - Dietmar Leeb hardness measuring device - Google Patents
Dietmar Leeb hardness measuring device Download PDFInfo
- Publication number
- CN2750312Y CN2750312Y CN 200320129643 CN200320129643U CN2750312Y CN 2750312 Y CN2750312 Y CN 2750312Y CN 200320129643 CN200320129643 CN 200320129643 CN 200320129643 U CN200320129643 U CN 200320129643U CN 2750312 Y CN2750312 Y CN 2750312Y
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- impact body
- measuring device
- hardness
- lee
- impact
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Abstract
The utility model relates to a measuring device for dietmar leeb hardness, which comprises a base, a working table which is placed on the base, an impact body which is provided with a tungsten carbide ball head, a guiding cylinder which controls the radial position of the impact body, a lifting, releasing and holding mechanism of the impact body, a control device, speed measuring device and a data collecting and processing device, wherein an energy applying device of the impact body completely adopts earth attraction which is gravity. The speed measuring device adopts a laser Doppler speed measurement system. The utility model can be applied to test the hardness of D type and G type dietmar leeb blocks, with the characteristics of good long-term stability, high measuring precision, high speed and simplicity.
Description
Technical field
The utility model relates to a kind of hardness measuring device, and particularly a kind of device of measuring the test specimen lee ' hardness belongs to the Technology of Precision Measurement field.
Background technology
The lee ' hardness measuring method, be to invent later 1970s by Switzerland doctor D.LEEB, it is dynamic stiffness test method based on the energy measurement principle, the basis of its test principle is to make to keep a constant energy (D type 11Nmm, G type 90Nmm) impact body impacts on the static material test specimen, resilience is got up again, and measurement resilience fashion is present in the energy (residual amount of energy) in the sample, and this residual amount of energy is promptly represented the size of lee ' hardness.The lee ' hardness value is defined as:
In the formula: HL-lee ' hardness value
v
Instead-bounce-back speed
v
Dash-impact velocity
Small and exquisite, exquisite with this test principle development and mass-produced portable Leeb Hardness Tester, obtain promotion and application widely rapidly at home, outward.
Portable Leeb Hardness Tester is made up of Apparatus for Impacting at low-temp and electronic console, structure is seen Fig. 1, and Apparatus for Impacting at low-temp is made up of the impact body of band tungsten carbide bulb, the guide cylinder of controlling the impact body radial position, impact body energy applicator, release clamping device, control device, speed measuring device etc.The impact body energy applicator is made of a bearing tube and the impact spring that is installed in the bearing tube, discharging clamping device and control device is made up of the switch of a clamp and the action of control clamp, speed measuring device adopts electromagnetic probe, and it is made of with the coil that is fixed on the guide cylinder front portion the permanent magnet that is installed in the impact body.Its course of work is earlier guide cylinder to be pushed bearing tube, come up then, at this moment impact body is clamped by clamp, and impact spring compressed, press release-push, clamp is just decontroled impact body, and impact body is because the test specimen surface is launched in spring action, electromagnetic probe is measured impact velocity and the bounce-back speed apart from one millimeter position of specimen surface, and by formula calculates the lee ' hardness value.Because all there are defective in impact spring, permanent magnet and solenoid aspect accuracy and the long-time stability, can not keep stable measuring accuracy.
Summary of the invention
In order to overcome the present deficiency that scleroscopic long-time stability are poor, measuring accuracy is low, the purpose of this utility model has provided a kind of lee ' hardness measurement mechanism, its measuring accuracy height, and long-time stability are good.
Lee ' hardness measurement mechanism of the present utility model, comprise base, be placed on the worktable on the base, the impact body of band tungsten carbide bulb, guide cylinder, impact body lifting release clamping device, control device, speed measuring device and the data acquisition processing device of control impact body radial position, impact spring is abandoned in the acquisition that is characterized in the impact body energy, and adopt terrestrial gravitation fully is the mode of gravity, like this, the invariant position before as long as impact body discharges, its energy also is constant.For the accuracy and the stable row that improve velocity survey, speed measuring device adopts laser doppler velocimeter system.
For the convenience of measuring hardness, accurately, control device adopts electric-control system, it mainly is made up of Programmable Logic Controller, driver and photoelectric tube etc., finish clamping, release, rising, decline, the position judgment of impact body by this electric-control system, functions such as drift selection, and have manual and automatic two kinds of implementations; Data acquisition processing device adopts digital collection system that is made of digital storage oscilloscope and the data handling system that mainly is made of microcomputer, connects by 488 interfaces between digital collection system and the data handling system.Computing machine passes through quick, the accurate and effective transmission of original Doppler signal that the realization of 488 interfaces is gathered oscillograph like this, and according to the original Doppler signal that obtains, finally obtains the lee ' hardness value by low-pass filtering, phase calculation, speed calculation etc.
Laser doppler velocimeter system mainly is made up of laser instrument, spectroscope, receiver etc., and uses bragg cell to realize the velocity reversal differentiation, is used for the speed of tracking measurement impact body at whereabouts and springback process.Improved the accurate of velocity survey more, the accuracy of hardness measurement just is further enhanced.
Description of drawings
Below in conjunction with accompanying drawing the utility model is described further.
Fig. 1 is portable Leeb Hardness Tester structural drawing
Fig. 2 is a structured flowchart of the present utility model
Fig. 3 is a structural representation of the present utility model
Among Fig. 3,1. base, 2. worktable, 3. sample, 4. guide cylinder, 5. impact body 6. discharges clamping device, 7. riser guide, 8. laser velocimeter device, 9. screw mandrel, 10. lifting handwheel, 11. electric-control systems, 12. computing machines, 13. number extraction systems, 14. laser velocimeter devices.
Embodiment
The utility model be light harvesting, mechanical, electrical system in the very high device of the automaticity of one, form by main frame, impact body, electric-control system, laser doppler velocimeter system, number extraction system, data handling system etc.Structured flowchart is seen Fig. 2.
Main frame discharges clamping device (6), riser guide (7), screw mandrel (9) and lifting handwheel (10) etc. by base (1), worktable (2), guide cylinder (4), impact body (5), impact body and forms.Its base weighs 400 kilograms, and is firm, stable, satisfies the requirement of lee ' hardness dynamic test.Elevating mechanism and clamping device are used to discharge D type impact body and G type impact body, carry out the calibrating of lee ' hardness HLD and HLG scale.The quality D type of impact body (5) is 5.5g ± 0.05g, and the G type is 20g ± 0.05g, and top design has step, is convenient to clamping device (6) clamping and holds up, and makes impact body (5) discharge the preceding free state that fully keeps.The bulb of impact body uses the tungsten carbide bulb of diameter 3mm and 5mm by test method.
Electric-control system (11) mainly is made up of Programmable Logic Controller, driver and photoelectric tube etc.Finish clamping, release, rising, the decline of impact body; Position judgment, functions such as drift selection have manually and automatic two kinds of implementations.
Laser velocimeter device (8) (14) mainly is made up of laser instrument, spectroscope, receiver etc., and use bragg cell to realize the velocity reversal differentiation, connect with electric wire between laser velocimeter device (8) and (14), be used for the speed of tracking measurement impact body at whereabouts and springback process.Adopt laser Doppler speed measuring device to measure impact velocity and bounce-back speed that impact body contacts sample and leaves sample 1mm position, it has following characteristics:
Non-cpntact measurement; The spatial resolution height; Dynamic response is fast, and is minimum with light velocity propagation inertia; The measuring accuracy height; The measurement range is big; The sensitivity of measuring speed direction is good; This device has used bragg cell, can carry out the differentiation of velocity reversal.
Number extraction system (13) adopts digital storage oscilloscope, and sampling rate can reach 1G/s/4CH.Quick, the accurate and effective transmission of original Doppler signal that computing machine (12) is gathered oscillograph by the realization of 488 interfaces, and, finally obtain the lee ' hardness value by low-pass filtering, phase calculation, speed calculation etc. according to the original Doppler signal that obtains.
Introduce measuring process of the present utility model below:
Preheating: before the work, open the power switch of computing machine (12), number extraction system (13) and laser velocimeter system (8) respectively, and preheating 30 minutes.
Manual mode
1) operation computer software, and input relevant information;
2) on the control panel of electric-control system (11), select manual mode;
3) on the control panel of electric-control system (11), select corresponding scale button (D type or G type);
4) open the electric-control system shift knob;
5) impact body of choosing (5) is put into guide cylinder (4) lower end,, clamp releasing mechanism (6) this moment and will automatically impact body (5) be clamped picking-up by the clamping button on control system (11) panel;
6), clamp releasing mechanism (6) and will drive impact body (5) rising automatically in guide cylinder (4), up to the working position by the rising button;
7) " zero line detection " button on the click computer software interface detects the velocity-measuring system zero line;
8) " sampling " button on the click computer software interface begins sampling;
9) press release-push, clamp releasing mechanism (6) and will unclamp impact body (5), impact body (5) can free-falling, impacts on the examination face of sample (3) and bounce-back;
10) " beginning to calculate " button on the click software interface calculates impact body speed and tested sample hardness number automatically;
11) repeat aforesaid operations, take multiple measurements, obtain the mean value and the unevenness of final tested sample.
Automatic mode
1) operation computer software, and input relevant information;
2) on the control panel of electric-control system (11), select automatic mode;
3) on the control panel of electric-control system (11), select corresponding scale button (D type or G type);
4) impact body of choosing (5) is put into guide cylinder (4) lower end, by the shift knob on control system (11) panel, clamp releasing mechanism (6) this moment and will automatically impact body (5) be clamped picking-up and drive impact body (5) automatic rising in guide cylinder (4), up to the working position;
5) " zero line detection " button on the click computer software interface detects the velocity-measuring system zero line;
6) " sampling " button on the click computer software interface begins sampling;
7) on the control panel of electric-control system (11), press " test " button, clamp releasing mechanism (6) and will unclamp impact body (5), impact body 5 meeting free-fallings, impact on the examination face of sample (3) and bounce-back, clamping releasing mechanism this moment can descend automatically, and clamping impact body (5) is prepared to discharge to the working position next time again.；
8) " beginning to calculate " button on the click software interface calculates impact body speed and tested sample hardness number automatically;
9) repeat aforesaid operations, take multiple measurements, obtain the mean value and the unevenness of final tested sample.
This device has following advantage:
1. this device impact body adopts freely falling body delivery mode, energy precise control, good reproducibility.
2. this device adopts the laser Dppler veloicty measurement principle to realize impact, the measurement of bounce-back speed Tracking, the real-time height, and data are accurate;
3. utilize above-mentioned two method first Application in the hardness measurement field, unprecedented.
4. this device precision height can be used as standard apparatus, has solved the direct amount arraign topic of lee ' hardness.
5. this method is traceable to basic dimension such as wavelength and time.
6. the whole operating process of this device realize action and signals collecting and data processing such as impact body clamping automatically by computer control, can print verification result and certificate automatically, and are easy to operate;
7. this device list calibrating point operation process of the test is 20 seconds only, and work efficiency is high.
8. this device software adopts The visual design, and working interface is succinct, single, friendly.
The utility model can be applicable to the test of lee ' hardness D type and G type lee ' hardness piece, and measurement range is (200～900) HLD/HLG.
Claims (2)
1. lee ' hardness measurement mechanism, comprise base, be placed on the worktable on the base, the impact body of band tungsten carbide bulb, guide cylinder, impact body lifting release clamping device, control device, speed measuring device and the data acquisition processing device of control impact body radial position, it is characterized in that: it is gravity that the impact body energy obtains to adopt terrestrial gravitation fully, and speed measuring device adopts laser doppler velocimeter system.
2. lee ' hardness speed measuring device according to claim 1 is characterized in that having adopted bragg cell in the described laser doppler velocimeter system, thereby realizes the differentiation of impact body velocity reversal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320129643 CN2750312Y (en) | 2003-12-25 | 2003-12-25 | Dietmar Leeb hardness measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320129643 CN2750312Y (en) | 2003-12-25 | 2003-12-25 | Dietmar Leeb hardness measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2750312Y true CN2750312Y (en) | 2006-01-04 |
Family
ID=35823695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320129643 Expired - Fee Related CN2750312Y (en) | 2003-12-25 | 2003-12-25 | Dietmar Leeb hardness measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2750312Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494966A (en) * | 2011-12-22 | 2012-06-13 | 江南大学 | Automatic hardness detection device for table tennis balls |
| CN103454512A (en) * | 2012-05-31 | 2013-12-18 | 海洋王（东莞）照明科技有限公司 | Touch screen hardness testing method |
| CN103630458A (en) * | 2013-12-12 | 2014-03-12 | 曾汉 | Rebound value calibration device |
| CN105571966A (en) * | 2014-10-13 | 2016-05-11 | 北新集团建材股份有限公司 | Testing method and apparatus for surface hardness of gypsum plaster board |
-
2003
- 2003-12-25 CN CN 200320129643 patent/CN2750312Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494966A (en) * | 2011-12-22 | 2012-06-13 | 江南大学 | Automatic hardness detection device for table tennis balls |
| CN102494966B (en) * | 2011-12-22 | 2013-04-17 | 江南大学 | Automatic hardness detection device for table tennis balls |
| CN103454512A (en) * | 2012-05-31 | 2013-12-18 | 海洋王（东莞）照明科技有限公司 | Touch screen hardness testing method |
| CN103630458A (en) * | 2013-12-12 | 2014-03-12 | 曾汉 | Rebound value calibration device |
| CN105571966A (en) * | 2014-10-13 | 2016-05-11 | 北新集团建材股份有限公司 | Testing method and apparatus for surface hardness of gypsum plaster board |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060104 Termination date: 20121225 |