CN1004649B - 称重装置 - Google Patents
称重装置 Download PDFInfo
- Publication number
- CN1004649B CN1004649B CN87103316.XA CN87103316A CN1004649B CN 1004649 B CN1004649 B CN 1004649B CN 87103316 A CN87103316 A CN 87103316A CN 1004649 B CN1004649 B CN 1004649B
- Authority
- CN
- China
- Prior art keywords
- weight
- mentioned
- time interval
- weigher
- vibration
- Prior art date
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- Expired
Links
- 238000005303 weighing Methods 0.000 title claims abstract description 13
- 230000010354 integration Effects 0.000 claims abstract description 7
- 230000010355 oscillation Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/40—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
- G01G3/16—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of frequency of oscillations of the body
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
Abstract
一种称重装置,将振动的重量指示信号积分并由计算装置求出平均值,然后把重量结果以数字显示出来。根据本发明所改进的运算部件要提供一种方法,用来计算有关振动系统的振动周期,并根据所计算的振动周期确定积分时间。因此,可以将被称物品重量变化时由于振动周期的改变而产生的测量误差减至最小。
Description
本发明涉及到一种称重装置;特别是这样的称重装置,由加载的称量器(weigher)所产生的重量信号开始振动地变化,并且这个振动的周期与称量器上的载荷呈函数关系。
日本公开发表的专利公报第55-1578号披露出一种称重装置,它用作台式数字天平或市场上用的秤。如图4所示,在这种装置中,物品2被称量器1称重。称量器1包括一个象电阻测力计或是力平衡式的重量传感器,并产生一个代表物品2重量的模拟电信号。这一信号经放大器3放大,并被时间积分模拟/数字转换器21转换成数字信号,该数字信号在数字显示器22上显示为重量数值。
模拟/数字转换器21用来在特定的时间区间T内对从放大器3来的模拟信号积分,并把积分结果除以时间T,以得到数字值。通常称量器1包括一个象弹簧这样的弹性振动系统,当称量器开始加载时,即产生一个振动着的重量指示信号,并且其振动的周期是随着称量器1上的物品2的重量而变化的。因此,上述特定的积分时间对振动周期的比值也随着物品2的重量而变化,这就会产生出所不希望的测量误差。
更具体地说,假设称量器1的振动是正弦式的,这样,从放大器3输出的模拟电信号e可以按下式给出:
e=W+asinωt,ω=2π/τ
其中,W是物品2的重量,a是振动的振幅,τ是振动周期,如图2所示。这样,从模拟/数字转换器21所得出的积分和平均信号包括了如下的误差E:
E=a;/T∫Tsinωt·dt
从图2中也可以明显看出,当积分在to时刻开始时,对于T值等于振动周期τ或者是τ的整数倍情况,在如t1、t2和t3的时间点处,这一误差值为零,然而当T为其它值时,误差值并不等于零。当如先有技术的装置中积分时间T是固定时,那么误差E为零的几率是很小的。因此,在先有技术的装置中,必须在一个如图3中B所示的时间区间进行积分,此处振动已基本上衰减完毕;而要避免在A所示的振动区间积分。这就导致了先有技术装置称重操作耗费时间的缺点。
因此,本发明的目的是解决上述在先有技术的时间积分模拟/数字转换器输出量中存在剩余误差E的问题。
根据本发明,模拟/数字转换器包括对于现有的物品重量敏感的装置,以计算出一个等于称量器的固有振动周期或者是该周期的整数倍的时间区间;还包括用等于所计算出的时间区间作为积分区间对来自称量器的重量信号积分的装置。因此,即使在图3的振动区间A中上述的误差E也总是等于零,这样就可能在最短的时间内获得准确的测量结果。
图1是表示本发明称重装置的电路结构的方框图。
图2和图3是为了有助于解释本发明而画出的波形图。
图4是表示先有技术称重装置电路结构的方框图。
现在,参照图1描述根据本发明的称重装置的一个实施例。在图中,称量器1和放大器3与图4中表示的先有技术的相应部件是相同的。可以把称量器1的振动系统看作是具有弹性常数K的机械弹簧,在弹簧上悬挂有重量为m的称重吊架,吊架上载有重量为Mx的物品,其振动周期τ可以按下式求得:
其中g为重力加速度。
放大器3的输出加到积分器4上,积分器4用来在预先整定的时间区间T内将模拟输入信号e积分。本发明的特征是:整定时间T,使其等于根据现有的被测重量Mx按上面公式计算出的周期τ或τ的整数倍的值。积分结果加到除法器5上,并除以按下面叙述的方法所计算的时间T。除法器5的平均输出加到重量发生器6上,后者用于实现重量校正并进行其他适当的处理而得出Mx的值,再由显示器7将Mx值显示出来。
运算单元8根据重量发生器6输出的Mx的值计算出积分区间T。如前所述,T值等于nτ(n=1,2,…)。计算值T经延迟传输线9适当延迟后加到积分器4和除法器5上。
Claims (1)
1、一台称重装置,它包括:一个其固有振动周期随着被称物品的重量而变化并产生一个相应于该重量的电信号的称量单元,一个对上述电信号在特定的时间区间内进行积分的积分器,以及一个将上述积分结果按上述时间区间求平均值以提供一个被测重量的计算单元,该装置的特征在于:它还包括计算上述特定时间区间的装置,该特定时间区间值等于与上述被测重量相对应的固有振动周期或该周期的整数倍,上述时间区间值被加到上述积分器和上述计算单元中。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61105571A JP2562876B2 (ja) | 1986-05-07 | 1986-05-07 | 計量装置 |
JP105571/86 | 1986-05-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN87103316A CN87103316A (zh) | 1987-12-09 |
CN1004649B true CN1004649B (zh) | 1989-06-28 |
Family
ID=14411208
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN87103316.XA Expired CN1004649B (zh) | 1986-05-07 | 1987-05-06 | 称重装置 |
Country Status (7)
Country | Link |
---|---|
US (1) | US4770261A (zh) |
JP (1) | JP2562876B2 (zh) |
KR (1) | KR910001147B1 (zh) |
CN (1) | CN1004649B (zh) |
DE (1) | DE3714916A1 (zh) |
FR (1) | FR2598499B1 (zh) |
GB (1) | GB2190506B (zh) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0789078B2 (ja) * | 1987-03-03 | 1995-09-27 | 大和製衡株式会社 | 重量計測方法 |
DE3912144C2 (de) * | 1989-04-13 | 1998-09-17 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Achslastbestimmung eines Fahrzeugs |
US7057119B2 (en) * | 2003-01-20 | 2006-06-06 | Michigan Scientific Corp. | Egg weighing apparatus |
US20120273306A1 (en) * | 2011-04-28 | 2012-11-01 | John Alan Pangrazio | Activity Reporting System |
CN109060101B (zh) * | 2018-09-17 | 2020-08-28 | 广州市贺氏办公设备有限公司 | 一种电子秤环境自适应调整方法及系统 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3192535A (en) * | 1962-09-28 | 1965-06-29 | Republic Steel Corp | Method and apparatus for high speed weighing |
US3766472A (en) * | 1971-11-02 | 1973-10-16 | Franklin Electric Co Inc | Apparatus for elimination of error in a detecting system |
CH538678A (de) * | 1972-05-16 | 1973-06-30 | Wirth Gallo & Co | Elektrischer Massen- und Kraftmesser |
JPS5070060A (zh) * | 1973-10-24 | 1975-06-11 | ||
JPS6032811B2 (ja) * | 1978-06-20 | 1985-07-30 | 東芝テック株式会社 | 重量測定装置 |
US4230196A (en) * | 1978-09-22 | 1980-10-28 | Snead Edwin D | Load weighing and accumulating system and method for hydraulic loader |
US4390075A (en) * | 1978-09-22 | 1983-06-28 | Snead Edwin Des | Load weighing and accumulating system and method |
JPS5879233U (ja) * | 1981-11-24 | 1983-05-28 | 川崎製鉄株式会社 | 電子式ハカリ |
JPS5914737U (ja) * | 1982-07-21 | 1984-01-28 | 飯田 恒雄 | 球型バツクミラ− |
JPS59131131A (ja) * | 1983-01-17 | 1984-07-27 | Yamato Scale Co Ltd | 力測定装置 |
US4503922A (en) * | 1983-05-26 | 1985-03-12 | Bitronics, Inc. | Electronic bathroom scale apparatus using planar coil sensors |
-
1986
- 1986-05-07 JP JP61105571A patent/JP2562876B2/ja not_active Expired - Lifetime
-
1987
- 1987-03-19 FR FR878703813A patent/FR2598499B1/fr not_active Expired - Lifetime
- 1987-03-23 US US07/028,721 patent/US4770261A/en not_active Expired - Lifetime
- 1987-04-09 KR KR1019870003394A patent/KR910001147B1/ko not_active IP Right Cessation
- 1987-05-05 GB GB8710581A patent/GB2190506B/en not_active Expired
- 1987-05-05 DE DE19873714916 patent/DE3714916A1/de active Granted
- 1987-05-06 CN CN87103316.XA patent/CN1004649B/zh not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US4770261A (en) | 1988-09-13 |
GB2190506B (en) | 1989-12-13 |
KR910001147B1 (ko) | 1991-02-25 |
GB2190506A (en) | 1987-11-18 |
JPS62261021A (ja) | 1987-11-13 |
JP2562876B2 (ja) | 1996-12-11 |
GB8710581D0 (en) | 1987-06-10 |
DE3714916C2 (zh) | 1990-10-31 |
FR2598499A1 (fr) | 1987-11-13 |
DE3714916A1 (de) | 1987-11-12 |
FR2598499B1 (fr) | 1990-10-26 |
KR870011458A (ko) | 1987-12-23 |
CN87103316A (zh) | 1987-12-09 |
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C14 | Grant of patent or utility model | ||
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C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
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C17 | Cessation of patent right | ||
CX01 | Expiry of patent term |