CN203772184U - Special device for measuring length of bolt in proof load test - Google Patents

Special device for measuring length of bolt in proof load test Download PDF

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Publication number
CN203772184U
CN203772184U CN201420170894.4U CN201420170894U CN203772184U CN 203772184 U CN203772184 U CN 203772184U CN 201420170894 U CN201420170894 U CN 201420170894U CN 203772184 U CN203772184 U CN 203772184U
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China
Prior art keywords
bolt
test
support
load test
slide rail
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Application number
CN201420170894.4U
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Chinese (zh)
Inventor
吴勇
单长伟
李吉
陈敬海
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Nanjing Automobile Group Corp
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Nanjing Automobile Group Corp
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Priority to CN201420170894.4U priority Critical patent/CN203772184U/en
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Abstract

The utility model discloses a special device for measuring the length of a bolt in a proof load test. The device is divided into a handheld measurement area A and a sample clamping and fixing area B; the device is composed of a slide rail and supports; the supports are fixed on the slide rail; two supports are oppositely arranged, wherein one support is provided with a micrometer caliper, and the other support which is opposite to the one support is provided with a pushing pin; and the supports are fixed on the slide rail through supporting frame fixing bolts. With the special device for measuring the length of the bolt in the proof load test provided by the technical scheme of the utility model adopted, influence on test data which is caused by the capability of an operator for operating equipment, the size of a sample, changes of measurement states and position points in twice before and after the test can be avoided, and the precision and reliability of measured data can be improved.

Description

Ensure the special measurement device of bolt length in load test
Technical field
The utility model relates to a kind of device of using for the linear measure longimetry of bolt guarantee load test.
Background technology
Along with the development of Global Auto industrial technology, improve constantly the requirement of the integrated technology such as vehicle safety and economy index control, the requirement of automobile production process control is more and more higher, and the control of the each parts all technical of automobile more and more trends towards quantitative control.As everyone knows, bolt be main on automobile product, important, a large amount of use be fastenedly connected part, it links up automobile all parts as requested, on these automobiles, whether a large amount of bolt products that use meet design and use requirement, to carry out corresponding seizure test work, if corresponding seizure test process and result are unreliable, just can not ensure the quality of vehicle complete vehicle product, person loses control and the assurance for car mass will to make production, also can make automobile product user lose the trust to product quality.
Bolt ensures that load test is performance index seizure test method conventional in bolt performance index project, the method is to apply at bolt axis direction the guarantee load front and back that standard specifies, determine the method for bolt samples met standard-required with bolt axial deflection, and GB/T3098.1 standard specifies proof bolt length variations amount≤12.5 μ m, require measurement size variable quantity little, measuring accuracy requires high.
But in the load test of bolt guarantee for many years process, find that the survey instrument that current operation uses is all general survey instruments, such as milscale, vernier caliper etc., due to all non-special measuring appliances for this test design of these measurers, use its applicability and stability in test bolt linear measure longimetry work to have certain limitation, can not fine satisfied guarantor carry the job requirement of experimental measurement bolt length variations.Particular problem is as follows:
1. in the time ensureing load test project, the bolt of different length specification, need to use the gage measuring of dimension, and require measurement measurer should there is the resolving power of 0.005mm, the measurer that adapts to this requirement is accurate survey instrument, if become serial, complete measurer and be equipped with specification as seizure test department, will there is the phenomenon that measurer service efficiency is low, use cost is high, also strengthen the burden of equipment and instrument management.
2. as (the conventional measurer using is milscale) under Fig. 1 state, in the time that bolt length reaches certain size (as being greater than 150mm), Fig. 2 is correct operation.Operating personnel just may with the hands control the state of adjusting sample clamping fixed area in controlling territory, measurer holding area, hand-held measured zone, position between steel ball, sample and measurer is just not easy to ajust and hold mode, be more prone to produce random angular deviation α, thereby the measurement data deviation causing, see Fig. 3, the stability of bolt linear measure longimetry work and operability variation, measure difficulty and strengthen, the degree of accuracy of measuring reduces, and it is large that the dispersion of data becomes.
3. in test, need to before and after test, respectively measure once, and twice measurement data compared, change with sample size before and after determining test the technical requirement that whether meets≤12.5 μ m, and state correctness and consistance be how while measuring for this twice, can have influence on the comparability of this twice test figure, affect the judgement of testing crew to specimen test result accuracy.
Summary of the invention
For the problems referred to above of finding in the course of the work,
Design proposal of the present utility model is as follows:
Ensure the special measurement device of bolt length in load test, be made up of slide rail, support and rack-mount canonical measure utensil, thimble, described is set up on slide rail, and described support is provided with two, one of them support is provided with canonical measure utensil, and another support is provided with thimble; The axis of canonical measure utensil and thimble is on same level line.
The end that described canonical measure utensil contacts with bolt is semisphere, and the end that described thimble contacts with bolt is semisphere.By being designed to semisphere, change operating personnel and also will control steel ball state at operational measure instrument measurement bolt sample simultaneously, and be not easy the situation of the correct measurement state that keeps stable, solve the impact of measuring state stability on test figure while detection, reduced the difficulty of testing crew operation.
Described canonical measure utensil is micrometer caliper; Support is fixed on slide rail by bracket fixing bolt, the position of support on slide rail can be adjusted at random, solve the situation that measurer that different length sized bolt sample need to be equipped with dimension again just can carry out and complete test, in the time using this special measurement instrument, the bolt sample that can realize different length specification just can carry out and complete the twice bolt linear measure longimetry work of load test that ensures on a special measurement device.
When described device busy, can place by horizontal stable, also fixing rear vertical placement of usable criterion section components; The coaxial precision of thimble and etalon, is ensured by device guide rail section, does not need artificial adjustment.Support and slide rail adopt planar slide to coordinate, and can be connected and fixed by tighting a bolt.
Adopt the technical solution of the utility model, ensure the special measurement device of bolt length in load test, Pass Test standard-required, bolt ensures in load test, avoid the variation due to ability, sample size, test twice of front and back measuring state and the location point of test operation personnel operational measure equipment, produce the impact on test figure, improve the accuracy and reliability of measurement data.
Meanwhile, the utility model to bolt ensure load test linear measure longimetry work provide one simple in structure, reliable, easy to use and efficient, be also easy to the design proposal of the measurer of manufacturing.
Brief description of the drawings
Fig. 1 is that in prior art, conventional measurer (as milscale) is measured bolt length view.
Fig. 2 is measuring state schematic diagram correct in prior art.
Fig. 3 is incorrect measuring state in prior art.
Fig. 4 is the front view of the special measurement device of bolt length in guarantee load test of the present utility model.
Fig. 5 dribbles crown pin and bolt head in conjunction with schematic diagram under the measuring state of the special measurement device of bolt length in guarantee load test of the present utility model.
Wherein, 1 micrometer caliper; 2 bolt samples; 3 slide rails; 4 thimbles; 5 supports; 6 bracket fixing bolts.
Embodiment
Below in conjunction with accompanying drawing and embodiment of the present utility model to this practical being further described.
As described in Figure 4, described device is divided into hand-held measurement zone A and sample clamping fixed area B, described device is made up of slide rail 3 and support 5, support 5 is fixed on slide rail 3, support 5 is relatively set with two simultaneously, a support 5 is provided with micrometer caliper 1, and support on the other side is provided with thimble 4, and described support 5 is fixed on support by bracket fixing bolt 6.
As shown in Figure 5, the measurement head of micrometer caliper and thimble is designed to semi-round ball shape, change operating personnel and also will control steel ball state at operational measure instrument measurement bolt sample simultaneously, and be not easy the situation of the correct measurement state (Fig. 2) that keeps stable, solve the impact of measuring state stability on test figure while detection, reduced the difficulty of testing crew operation.
Before load test and after test, sample measurement state is ensured by measurement mechanism, does not need operating personnel to go to adjust.Before and after test, twice measuring state is in full accord, can not produce because measuring state changes the data deviation producing.
The main components of described measurement mechanism adopts standard spare and accessory parts, slide rail material is lightweight material section bar, main measuring appliance is conventional micrometer caliper, do not need specialized designs processing, only have support to need special processing, but it is simple in structure, easy to process, between main components, also adopt plain bolt to fix and clamp, easy operating, adjustment, dismounting and maintenance.
Concrete use procedure is as follows:
One, before load test:
1. as shown in Figure 4, micrometer caliper and thimble are fixed on to support relative position;
2. according to detected bolt sample length specification, adjusting pole position is also locked on slide rail.
3. the taper hole of bolt sample one end is headed into thimble ball-shaped end.
4. the coarse adjustment of rotating screw mircrometer gauge and vernier adjustment knob, heads into bolt sample other end taper hole place by the ball-shaped end of measuring head (micrometer caliper).
5. measure bolt sample length, and record the data of micrometer caliper.
6. must not become flexible bracket fixing bolt, the relative position of support and slide rail while keeping measuring.
7. the coarse adjustment of rotating screw mircrometer gauge or vernier adjustment knob exit ball-shaped end from bolt taper hole, take out bolt sample and ensure load load test.
Two, after load test:
1. the bolt sample one end taper hole taking off after load test is headed into thimble ball-shaped end.
2. again rotate coarse adjustment and the vernier adjustment knob of adjusting micrometer caliper, by the ball of measuring head (micrometer caliper)
Shape end heads into bolt sample other end taper hole place.
3. measure bolt sample length, and record the data of micrometer caliper.
By above-mentioned test procedure, complete and ensure twice surveying work of the needed bolt length of load test, by comparing the variation size of data that this twice measurement obtains, just can judge that whether bolt sample is by ensureing the technical requirement of load test project specifies in GB/T3098.1.
Three, these measurement mechanism applicable elements and points for attention:
1. bolt sample can be measured length and determines by installing slide rail length.
2. ensure that at same group or sized bolt sample the position of load test medium-height trestle on slide rail is fixed, only clamp and measure the size of sample by the coarse adjustment on rotating screw mircrometer gauge and vernier adjustment knob, or unclamp bolt sample.
3. what the measuring head that this device is equipped with was selected to be equipped with is common micrometer caliper, and it should have resolving power more than 0.005mm, and measures measurer head and be processed into spherical structure, to meet code test requirement.
4. the bolt length variations that this device is only applicable in this pilot project is measured, and is not suitable for the measurement of the concrete size of bolt in process of manufacture.

Claims (3)

1. ensure the special measurement device of bolt length in load test, it is characterized in that: described measurement mechanism is made up of slide rail, support and rack-mount canonical measure utensil, thimble, described is set up on slide rail, described support is provided with two, one of them support is provided with canonical measure utensil, and another support is provided with thimble; The end that described canonical measure utensil contacts with bolt is semisphere, and the end that described thimble contacts with bolt is semisphere.
2. the special measurement device of bolt length in guarantee load test according to claim 1, is characterized in that: described canonical measure utensil is micrometer caliper.
3. the special measurement device of bolt length in guarantee load test according to claim 1, is characterized in that: described support is fixed on slide rail by bracket fixing bolt.
CN201420170894.4U 2014-04-09 2014-04-09 Special device for measuring length of bolt in proof load test Active CN203772184U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420170894.4U CN203772184U (en) 2014-04-09 2014-04-09 Special device for measuring length of bolt in proof load test

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420170894.4U CN203772184U (en) 2014-04-09 2014-04-09 Special device for measuring length of bolt in proof load test

Publications (1)

Publication Number Publication Date
CN203772184U true CN203772184U (en) 2014-08-13

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Application Number Title Priority Date Filing Date
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Country Status (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104848764A (en) * 2015-05-07 2015-08-19 上海大学 Bolt length measuring device
CN112556630A (en) * 2020-11-23 2021-03-26 上海大学 Intelligent high-precision measuring device for guaranteeing micro-deformation of load test by fastener

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104848764A (en) * 2015-05-07 2015-08-19 上海大学 Bolt length measuring device
CN112556630A (en) * 2020-11-23 2021-03-26 上海大学 Intelligent high-precision measuring device for guaranteeing micro-deformation of load test by fastener

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