CN209231102U - A kind of device for evaluating and testing falling sphere body localized contact characteristic - Google Patents
A kind of device for evaluating and testing falling sphere body localized contact characteristic Download PDFInfo
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- CN209231102U CN209231102U CN201822096546.8U CN201822096546U CN209231102U CN 209231102 U CN209231102 U CN 209231102U CN 201822096546 U CN201822096546 U CN 201822096546U CN 209231102 U CN209231102 U CN 209231102U
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Abstract
A kind of device for evaluating and testing falling sphere body localized contact characteristic, belongs to Resilient Modulus of Subgrade Soils testing field.It is characterized by: being made of standard fixture and standard testing component two parts；Standard fixture is made of four arc-shaped card slot valve arcs, it is right angle form on the outside of valve arc, surveying in valve arc is standard rounding top and bottom pattern, and arc radius is falling sphere body apex radius of curvature specified in falling sphere instrument product standard, and four valve arcs, which are mutually perpendicular to orthogonal formation, can bond the notch of standard spherical surface；Standard testing component is made of standard material, external fixed material and fixing bolt；Fixing bolt stablizes the entire standard material of build-in；Standard material is nylon material or PPR material；Standard material is fixed on external fixed material；Standard fixture realizes the automatic clamping alignment of measuring surface in measurement process.The present apparatus ensure that measurement object is a standard spherical surface, also ensure that the accuracy of measurement result, carrying that can be reliable and stable and the standard value for reappearing the modulus of resilience.
Description
Technical field
The utility model relates to a kind of devices for evaluating and testing falling sphere body localized contact characteristic, belong to Resilient Modulus of Subgrade Soils test
Field.
Background technique
Fall-ball type ground modulus of resilience tester is Department of Transportation's engineering specification " highway subgrade pavement on-the-spot test rule
Journey " (JTG E60) one of Resilient Modulus of Subgrade Soils test method for recommending.Currently, the equipment at home and abroad a engineering more than 300
Upper verifying simultaneously uses.Falling sphere body is the important measurement part device of the equipment, apex radius of curvature, Hertz contact response modulus
Whether the parameter of the reflection such as (i.e. as the modulus of resilience of measurement result) localized contact characteristic complies with standard, for guaranteeing the equipment
The reliability of product quality and such test method is all extremely important.This patent proposes the technology of protection, falls dedicated for evaluation and test
Whether the localized contact characteristic of sphere complies with standard, this technology can be applied to the exfactory inspection and validity period of falling sphere instrument product
It checks, is conducive to the application for pushing fall-ball type ground modulus of resilience tester in highway engineering field.
1) the vernier caliper direct method of measurement of apex radius of curvature
Currently, being measured for falling sphere body apex radius of curvature mainly using vernier caliper method measured directly
Personnel by virtue of experience determine three measuring surface, and vernier caliper is then respectively adopted in three faces and directly reads the measurement of spherical radius
As a result.
2) comparative test method of the modulus of resilience
General material (usually some metastable test point) is chosen, is equipped using two or more falling sphere instrument same
Shi Kaizhan test, the final testing result of modulus is determined based on the comparison of measurement result.
Present technology has the disadvantage in that
1) Measurement reliability is poor.Apex radius of curvature is directly measured using vernier caliper, measuring surface selection fully rely on through
It tests, under conditions of not can guarantee measurement object is standard spherical surface, also just not can guarantee the reliability of measurement result.
2) measurement standard value cannot be known or reappeared in advance.Modulus of resilience value is obtained using the method for comparing test, though
The difference of measurement result between right available distinct device, but since measurand is any selection, not what one is particularly good at
First know the specific magnitude of measurand, it is also difficult to reappear the standard value again.
Summary of the invention
The utility model standard fixture realizes the automatic clamping alignment of measuring surface in measurement process, ensure that measurement object
For a standard spherical surface, the accuracy of measurement result is also ensured that.Standard sample can be reliable and stable carrying and reappear rebound
The standard value of modulus.
The device of falling sphere body localized contact characteristic parameters is measured described in this patent mainly by standard fixture and standard testing
Component two parts composition, the structure of standard fixture is as shown in Figure 1, the composition of standard element is as shown in Figure 2.
In Fig. 1, standard fixture is made of four arc-shaped card slot valve arcs, is right angle form on the outside of valve arc, is surveyed in valve arc
For standard rounding top and bottom pattern, arc radius is falling sphere body apex radius of curvature specified in falling sphere instrument product standard, four valve arc phases
Mutual perpendicular quadrature forms the notch that can bond standard spherical surface.
In Fig. 2, standard testing component by 1 standard material (usually standard nylon material or standard PPR material), 2 outside
Fixed material (cement concrete can be selected to pour), 3 fixing bolts composition.Fixing bolt has three groups, in the same plane mutually
At hexagonal angle, fixing bolt has the slot for capableing of build-in in the upper and lower part of 1 material respectively, and it is whole to guarantee that bolt can stablize build-in
A standard material.
The technical solution flow chart of the device of assessment falling sphere body localized contact characteristic parameters described in this patent is as shown in Figure 3.
The realization of the art of this patent scheme is first to carry out the evaluation and test of falling sphere body curvature characteristic using standard fixture, and the purpose is to judge test body
Whether it is the spherical surface of a standard, to guarantee radius of curvature measurement real result, accurate；Then, then using modulus of resilience mark
Quasi- test member carries out rebound characteristics evaluation and test, finally makes judge to whether falling sphere body complies with standard.
Localized contact characteristic: the Hertz that meets that spherical surface is showed when localized contact occurs with other materials surface connects
The feature and performance of touch article part, including rebound characteristics (modulus of resilience) and global characteristics.Falling sphere body: the common detection of geotechnical engineering is set
Ball device in standby " fall-ball type ground modulus of resilience measuring instrument " as measurement portion.
Overall technological scheme realizes that process is as follows:
(1) firstly, assembling falling sphere instrument equipment, it is ensured that equipment carries out next step test after being in normal operating conditions again；
(2) start the test of falling sphere body curvature characteristic；
(3) standard fixture is placed on platform, falling sphere body spherical cap portion is caught in fixture；
(4) with the naked eye judge whether there is visible gap between card slot and spherical surface: such as there is visible gap and enter in next step, if not
There are visible gaps to enter (8) step；
(5) gap width then is measured with clearance gauge；
(6) if gap width be greater than 2mm, product be judged as it is unqualified, into (19) step；
(7) if gap width is less than or equal to 2mm, enter (8) step；
(8) spherical crown is rotated more than 90 °, spherical cap portion is caught in fixture；
(9) with the naked eye judge whether there is visible gap between card slot and spherical surface: such as there is visible gap and enter in next step, if not
There are visible gaps to enter (13) step；
(10) gap width then is measured with clearance gauge；
(11) if gap width be greater than 2mm, product be judged as it is unqualified, into (19) step；
(12) if gap width is less than or equal to 2mm, enter (13) step；
(13) start the evaluation and test of falling sphere body rebound characteristics；
(14) falling sphere body is fallen from 100mm above standard element, it is made directly to hit standard material part；
(15) modulus of resilience indicating value E of falling sphere instrument output is read, and is compared with standard value Es；
(16) error of indication △ E=(E-Es)/Es is calculated；
(17) if △ E is no more than 10%, enter in next step；If △ E is more than 10%, enter (19) step；
(18) evaluation and test is qualified, evaluation result is recorded, into (20) step；
(19) unqualified, record evaluation result is evaluated and tested, into next step；
(20) falling sphere instrument shuts down, and evaluation and test terminates.
Detailed description of the invention
The signal of Fig. 1 standard fixture
Fig. 2 standard testing component fixed form schematic diagram
The technical solution flow chart of Fig. 3 assessment falling sphere body localized contact communications device
The technical solution flow chart of Fig. 4 specific example 1
Specific embodiment
(1) firstly, assembling falling sphere instrument equipment, powers on, debugged according to product description, it is ensured that equipment is in just
Next step test is carried out again after normal working condition；
(2) start the test of falling sphere body curvature characteristic；
(3) standard fixture is placed on platform, falling sphere body spherical cap portion is caught in fixture；
(4) with the naked eye judge whether there is visible gap between card slot and spherical surface, result is seamless；
(5) spherical crown is rotated more than 90 °, spherical cap portion is caught in fixture；
(6) with the naked eye judge whether there is visible gap between card slot and spherical surface, result is seamless；
(7) start the evaluation and test of falling sphere body rebound characteristics；
(8) falling sphere body is fallen from 100mm above standard element, it is made directly to hit standard material part；
(9) modulus of resilience indicating value E of falling sphere instrument output is read, and is compared with standard value Es；
(10) error of indication △ E=(E-Es)/Es is calculated；
(11) calculated result is shown, △ E is no more than 10%；
(12) evaluation and test is qualified, records evaluation result；
(13) falling sphere instrument shuts down, and evaluation and test terminates.
The auxiliary for the standard fixture that this patent provides more accurately realizes the judge of ball-crown body standard spherical surface, ensure that
The accuracy of radius of curvature measurement result；And the prior art is that survey crew randomly selects measuring surface by rule of thumb and directly measures, nothing
Method guarantees that measurement object is standard ball.The modulus standard testing part that this patent provides can be stable preservation and reproduction material
Modulus of resilience standard value improves the accuracy of evaluation result；And the prior art is to randomly select measurement object, due to that cannot obtain
Measurement standard value is obtained, therefore equipment room can only be passed through and compare acquisition evaluation result indirectly.This patent has fabulous applicability, energy
Enough it is applied to the evaluation and test of different classes of and model falling sphere instrument equipment.This patent provides the testing process more standardized and side
Method improves work efficiency convenient for concentrating evaluation and test.
This patent uses whether standard fixture evaluates and tests for standard spherical surface falling sphere body apex, is on the inside of fixture and standard
The circular arc construction that falling sphere body spherical surface is consistent, can be good at the apex spherical surface of clamping falling sphere body, to whether evaluate and test falling sphere body
For standard spherical surface.Modulus standard testing component is by the way of effectively fix to standard material, stable carrying and reproduction
Modulus of resilience standard value, is evaluated and tested so as to the localized contact characteristic to falling sphere body.
Claims (1)
1. a kind of device for evaluating and testing falling sphere body localized contact characteristic, it is characterised in that: by standard fixture and standard testing component two
Part forms；
Standard fixture is made of four arc-shaped card slot valve arcs, is right angle form on the outside of valve arc, and surveying in valve arc is standard circular arc
Form, arc radius are falling sphere body apex radius of curvature specified in falling sphere instrument product standard, and four valve arcs are mutually perpendicular to orthogonal
Form the notch that can bond standard spherical surface；
Standard testing component is made of standard material, external fixed material and fixing bolt；Fixing bolt is stablized build-in and is entirely marked
Quasi- material；Standard material is nylon material or PPR material；Standard material is fixed on external fixed material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822096546.8U CN209231102U (en) | 2018-12-14 | 2018-12-14 | A kind of device for evaluating and testing falling sphere body localized contact characteristic |
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| CN201822096546.8U CN209231102U (en) | 2018-12-14 | 2018-12-14 | A kind of device for evaluating and testing falling sphere body localized contact characteristic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540675A (en) * | 2018-12-14 | 2019-03-29 | 交通运输部公路科学研究所 | A kind of device and method for evaluating and testing falling sphere body localized contact characteristic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540675A (en) * | 2018-12-14 | 2019-03-29 | 交通运输部公路科学研究所 | A kind of device and method for evaluating and testing falling sphere body localized contact characteristic |
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