CN101893474B - Self-centering apparatus for bottom-loading balance weights - Google Patents
Self-centering apparatus for bottom-loading balance weights Download PDFInfo
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- CN101893474B CN101893474B CN 200910142869 CN200910142869A CN101893474B CN 101893474 B CN101893474 B CN 101893474B CN 200910142869 CN200910142869 CN 200910142869 CN 200910142869 A CN200910142869 A CN 200910142869A CN 101893474 B CN101893474 B CN 101893474B
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Abstract
The invention discloses a self-centering apparatus for bottom-loading balance weights. The self-centering apparatus comprises a lifting shaft, a balance scale pan, a self-centering platform, a lug boss and a weigh beam, wherein one end of the self-centering platform is fixed on the lifting shaft and the other end of the self-centering platform is circular; the circular surface is provided with a through groove; the balance scale pan is arranged below the circular surface end of the self-centering platform and provided with the lug boss which passes through the through groove on the self-centering platform; the height of the lug boss is slightly greater than the thickness of the self-centering platform; and the balance scale pan is provided with the weigh beam. Because the self-centering apparatus realizes the self-centering during the measurement, the positions of both the testing weight and the standard weight are fixed each time; and thus the weighing repeatability of the balance is greatly reduced and the measurement accuracy is improved.
Description
Technical field
The invention belongs to the mass metrology field, be specifically related to a kind of self-centering apparatus for bottom-loading balance weights that can effectively reduce the balance uneven loading error.
Background technology
The present invention is only to being used for the following ware formula balance that the quality amount passes.
Pass the field in the quality amount, be concerned about the repeatability of balance most, repeatability is more little good more.In the quality transmission of quantity value process, counterweight is the primary standard device, and counterweight is the material measure that is subordinated to balance, and balance is mainly used in reproduction counterweight quality value.Therefore, the balance weighing performance is the important component part that the quality amount passes ability.The counterweight that pin-point accuracy has been arranged, balance that also must supporting pin-point accuracy could make up the counterweight standard set-up of pin-point accuracy.
According to the regulation of " JJG99-2006 weight detecting rules ", the quality amount passes and all adopts method of substitution.On following ware formula balance, place fixing counterweight counterweight on scale pan of balance, alternately place standard test weight and seized counterweight on another scale pan.Basic operational steps is: (1) is according to selected standard test weight of seized counterweight and balance; (2) reproduction standard test weight quality on balance; (3) the seized counterweight quality of reproduction on balance; (4) reproduction standard test weight quality on balance; (5) the quality difference of seized counterweight of calculating and standard test weight.For obtaining higher accuracy of measurement, step (2) can repeatedly circulate to (4).
In the said process, seized counterweight and standard test weight replace weighing, no matter are standard test weight or seized counterweight, and during each weighing, its position on the balance scale pan can not be repeated.The change of counterweight position on the scale pan is bound to influence balance reading.From the angle of specialty, owing to the counterweight error that the change of position causes on the scale pan is called uneven loading error, the size of uneven loading error is relevant with the unbalance loading degree.If can not adopt rational technological means, all be positioned at position identical on the scale pan when guaranteeing the each weighing of counterweight, then this systematic error of uneven loading error shows as certain randomness, just weighing result is inaccurate, it is bigger that the quality amount is passed influence.
Summary of the invention
The objective of the invention is: a kind of self-centering apparatus for bottom-loading balance weights is provided, effectively reduces or eliminate uneven loading error, the structure self-centering apparatus all is positioned at position identical on the scale pan when guaranteeing the each weighing of counterweight, further improves the weighing performance of balance.
Realize technical scheme of the present invention: a kind of self-centering apparatus for bottom-loading balance weights, its balance scale pan is connected with an arm of balance through the scale beam, but this device comprises lifting shaft, self-centering platform and the boss of VTOL (vertical take off and landing); One end of self-centering platform is fixed on the lifting shaft, and the other end is rounded, and on disc, is provided with groove; Below the disc end of self-centering platform is the balance scale pan, and the balance scale pan is provided with boss, and boss passes the groove that is complementary with it on the self-centering platform, and the height of boss is a little more than the thickness of self-centering platform.
Above-mentioned boss has 5 or 7, and groove also has 5 or 7 and be complementary with boss, and these grooves are the rectangle that differs in size, and the distribution that is centrosymmetric.
Above-mentioned lifting shaft drives through a fluid pressure drive device, can slowly go up and down.
The beneficial effect that the present invention obtains: because this device has been realized the self-centering of measuring process, make that the position of each check counterweight and standard test weight is all fixing, make the weighing repeatability of balance reduce greatly, improved accuracy of measurement.Shown in table 1 and table 2, repeatability is not 5.5mg when adopting the counterweight self-centering apparatus, and repeatability is 3.1mg after self-centering.
Description of drawings
Fig. 1 self-centering apparatus for bottom-loading balance weights front view.
Fig. 2 self-centering apparatus for bottom-loading balance weights vertical view.
Fig. 3 self-centering apparatus for bottom-loading balance weights right view.
Fig. 4 course of work synoptic diagram of feeling relieved.
Among the figure: the 1-lifting shaft; The 2-balance scale pan; 3-self-centering platform; The 4-boss; 5-scale beam.
Embodiment
Specify a kind of self-centering apparatus for bottom-loading balance weights of the present invention below in conjunction with accompanying drawing.
To the uneven loading error of following ware formula balance, we propose through realizing the counterweight self-centering, ware formula balance uneven loading error under eliminating.Like Fig. 1, shown in 2 and 3, a kind of self-centering apparatus for bottom-loading balance weights of the present invention comprises lifting shaft 1, the balance scale pan 2, self-centering platform 3, boss 4 and scale beam 5.One end of self-centering platform 3 is fixed on hydraulically powered cylindrical lifting shaft 1 top by a minitype motor driving, and the other end of self-centering platform 3 is rounded, and disc is provided with 7 rectangular through slot that vary in size.It below the disc of self-centering platform 3 the balance scale pan 2; The balance scale pan 2 is connected with an arm of balance through scale beam 5; The balance scale pan 2 is provided with 7 boss 4 that 7 grooves with self-centering platform 3 are complementary; These 7 boss 4 can pass 7 grooves on the self-centering platform 3, and the height of boss 4 is a little more than the thickness of self-centering platform 3.Lifting shaft 1 can drive self-centering platform 3 and go up and down slowly up and down under the effect of fluid pressure drive device; Counterweight on the boss 4 make self-centering platform 3 to lift to be in the scale pan 2 rises; Drop to the last plane that boss 4 when minimum exceeds self-centering platform 3 a little, and the lower plane of self-centering platform 3 can not touch the last plane of the balance scale pan 2.
Method of application and self-centering process in conjunction with accompanying drawing 4 these devices of explanation:
(a) during initial state, self-centering platform 3 is positioned at the top of the balance scale pan 2;
(b) counterweight (standard test weight is perhaps checked counterweight) is placed on the self-centering platform 3;
(c) start drive unit, drive slowly motion straight down of self-centering platform 3 by lifting shaft 1, the boss 4 of the balance scale pan 2 passes the groove of self-centering platform 3.At this moment, counterweight is placed on the balance scale pan 2, as has unbalance loading, and then the balance scale pan 2 moves self-centering platform 3 because a certain amount of deflection takes place in the action of gravity meeting straight up, and counterweight places on the self-centering platform 3, lets the balance scale pan 2 recover centre of gravity place.
(d) treat that the balance scale pan 2 is stable after, self-centering platform 3 is moved straight down, counterweight places on the balance scale pan 2;
(e) so repeatedly repeat above action, can realize the counterweight self-centering.
Adopt before and after the self-centering apparatus for bottom-loading balance weights, its repeatability has bigger variation, and table 1, table 2 are measured datas of following ware formula balance, to 10 measurement results, utilize Bezier formula basis of calculation deviation to obtain repeatability.Table 1 is the measurement data when not adopting the counterweight self-centering apparatus, and repeatability is 5.5mg, and table 2 is the measurement data after 8 self-centerings, and repeatability is 3.1mg.
Table 1
Table 2
Can know from above-mentioned experimental result: after adopting this self-centering apparatus, the weighing result accuracy of following ware formula balance has improved widely.
Claims (3)
1. self-centering apparatus for bottom-loading balance weights, its balance scale pan (2) is connected with an arm of balance through scale beam (5), it is characterized in that: but this device comprises lifting shaft (1), self-centering platform (3) and the boss (4) of VTOL (vertical take off and landing); One end of self-centering platform (3) is fixed on the lifting shaft (1), and the other end is rounded, and on disc, is provided with groove; Below at the disc end of self-centering platform (3) is the balance scale pan (2); The balance scale pan (2) is provided with boss (4); Boss (4) passes the groove that is complementary with it on the self-centering platform (3), and the height of boss (4) is a little more than the thickness of self-centering platform (3).
2. a kind of self-centering apparatus for bottom-loading balance weights according to claim 1; It is characterized in that: above-mentioned boss (4) has 5 or 7; Groove also has 5 or 7 and be complementary with boss (4), and these grooves are the rectangle that differs in size, and the distribution that is centrosymmetric.
3. a kind of self-centering apparatus for bottom-loading balance weights according to claim 1 is characterized in that: above-mentioned lifting shaft (1) drives through a fluid pressure drive device, can slowly go up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910142869 CN101893474B (en) | 2009-05-19 | 2009-05-19 | Self-centering apparatus for bottom-loading balance weights |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910142869 CN101893474B (en) | 2009-05-19 | 2009-05-19 | Self-centering apparatus for bottom-loading balance weights |
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| Publication Number | Publication Date |
|---|---|
| CN101893474A CN101893474A (en) | 2010-11-24 |
| CN101893474B true CN101893474B (en) | 2012-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200910142869 Active CN101893474B (en) | 2009-05-19 | 2009-05-19 | Self-centering apparatus for bottom-loading balance weights |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092301B (en) * | 2016-08-08 | 2019-11-29 | 山东省计量科学研究院 | Integral type counterweight combines automatic detection mechanism |
| CN109470351B (en) * | 2018-11-12 | 2021-11-05 | 上海市计量测试技术研究院(华东国家计量测试中心、上海市计量器具强制检定中心、中国上海测试中心) | Large-mass comparator weight calibrating device |
| CN113984170B (en) * | 2021-10-12 | 2024-10-01 | 北京优量云产业计量技术创新研究院有限公司 | Weighing tray and have mass comparator of weighing tray |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2227328Y (en) * | 1994-06-16 | 1996-05-15 | 机械工业部上海工业自动化仪表研究所 | Inclined splitting type weight loading and unloading device |
| JP2008026246A (en) * | 2006-07-25 | 2008-02-07 | Shimadzu Corp | Balance |
| CN101893473A (en) * | 2009-05-19 | 2010-11-24 | 北京航天计量测试技术研究所 | Automatic switching device for bottom-loading balance weights |
-
2009
- 2009-05-19 CN CN 200910142869 patent/CN101893474B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2227328Y (en) * | 1994-06-16 | 1996-05-15 | 机械工业部上海工业自动化仪表研究所 | Inclined splitting type weight loading and unloading device |
| JP2008026246A (en) * | 2006-07-25 | 2008-02-07 | Shimadzu Corp | Balance |
| CN101893473A (en) * | 2009-05-19 | 2010-11-24 | 北京航天计量测试技术研究所 | Automatic switching device for bottom-loading balance weights |
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| CN101893474A (en) | 2010-11-24 |
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