JPH052936B2 - - Google Patents
Info
- Publication number
- JPH052936B2 JPH052936B2 JP58158492A JP15849283A JPH052936B2 JP H052936 B2 JPH052936 B2 JP H052936B2 JP 58158492 A JP58158492 A JP 58158492A JP 15849283 A JP15849283 A JP 15849283A JP H052936 B2 JPH052936 B2 JP H052936B2
- Authority
- JP
- Japan
- Prior art keywords
- sample
- weight
- time
- value
- sample powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000010438 heat treatment Methods 0.000 claims description 29
- 238000001514 detection method Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 description 57
- 238000001035 drying Methods 0.000 description 24
- 238000000034 method Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001120 nichrome Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
Description
【発明の詳細な説明】
（発明の属する技術分野）
本発明は、セメント、鉱石などの物質に含まれ
る水分を、加熱乾燥減少方式により連続的に測定
する自動水分計に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to an automatic moisture meter that continuously measures moisture contained in substances such as cement and ore using a heating drying reduction method.
（従来技術）
鉄鉱石、木材、紙、土、穀類などの物質に含ま
れる水分を測定する測定装置としては、赤外線吸
収方式、誘電率変化型、抵抗変化型、中性子放射
型、加熱乾燥減少型などが提案されている。(Prior art) Measuring devices for measuring moisture contained in substances such as iron ore, wood, paper, soil, and grains include infrared absorption type, permittivity change type, resistance change type, neutron emission type, and heat drying reduction type. etc. have been proposed.
しかし、前記した測定装置のなかで、測定結果
が直接重量値で得られ、そして測定結果を得る過
程で何らの仮定も入らないことから、加熱乾燥減
少方式が最も信頼性がある。 However, among the above-mentioned measuring devices, the heat-dry reduction method is the most reliable because the measurement result is directly obtained as a weight value and no assumptions are made in the process of obtaining the measurement result.
この加熱乾燥減少方式の測定装置によると、天
びんを組込み、測定対象を加熱乾燥する時間をあ
らかじめ実験的に決めておき、この時間をタイマ
にセツトして加熱乾燥を行なつていた。このタイ
マによる設定方式によると、測定対象の含水量が
大幅に異なつているため、すべての水分が蒸発し
切らないうちに乾燥が終了したとみなしてしま
い、この時点で測定を行なうため測定結果の信頼
性は完全なものであるとすることができなかつ
た。また、測定対象の量を一定にしなければ、加
熱乾燥時間を一定に設定しても無意味なものとな
る。従つて、常に一定量の測定対象を装置に供給
することが必要となるが、種々の大きさの塊状体
を含む場合には一定量を装置に供給することはな
かなか困難である。更に有機性試料の場合は、も
のによつては乾燥し過ぎて、その試料にいわゆる
「焼け」を与えたり、また測定結果に信頼性がな
く、場合によつては発火や有毒ガスの発生という
危険も伴なうのである。 According to this heating-drying reduction method measuring device, a balance is installed, a time period for heating and drying the object to be measured is determined in advance experimentally, and this time is set in a timer to carry out the heating-drying. According to this setting method using a timer, since the moisture content of the measurement target differs significantly, it is assumed that drying has finished before all the moisture has evaporated. Reliability could not be guaranteed to be complete. Further, unless the amount of the object to be measured is kept constant, it is meaningless even if the heating drying time is set constant. Therefore, it is necessary to always supply a certain amount of the object to be measured to the apparatus, but it is quite difficult to supply a certain amount to the apparatus when agglomerates of various sizes are included. Furthermore, in the case of organic samples, they may dry out too much, causing a so-called "burn" effect on the sample, making the measurement results unreliable, and in some cases causing ignition or the generation of toxic gases. It also comes with danger.
（発明の目的）
本発明は、前記した従来技術の有する欠点を解
消するもので、試料加熱前の試料重量を基準値と
し、試料の加熱乾燥後の試料重量と比較減算し、
この比較減算した偏差重量が所定時間内に許容範
囲値を超えるか否かの比較判定を行なつて試料の
加熱乾燥の終了を検知し、試料に乾燥不足又は過
剰乾燥を与えることなく試料の水分率を求めるこ
とができ、かつ試料の加熱乾燥が正確に終了した
かどうかを時々刻々判別できるようにした自動水
分計を提供することを目的とする。(Objective of the Invention) The present invention solves the drawbacks of the prior art described above, and uses the sample weight before heating the sample as a reference value, compares and subtracts the sample weight with the sample weight after heating and drying the sample, and
By comparing and determining whether or not the deviation weight obtained by comparison and subtraction exceeds the allowable range value within a predetermined time, the completion of heating drying of the sample is detected, and the moisture content of the sample is determined without under-drying or over-drying the sample. It is an object of the present invention to provide an automatic moisture analyzer capable of determining the moisture content and determining from time to time whether heating drying of a sample has been accurately completed.
（発明の構成）
第１図は、本発明の構成を明示するための機能
ブロツク図である。(Configuration of the Invention) FIG. 1 is a functional block diagram for clearly showing the configuration of the present invention.
同図において、試料重量検出手段により加熱前
の試料重量を検出し、これを基準値とする。そし
て偏差重量検出手段により、その基準値と試料の
加熱乾燥後の時々刻々変化する試料重量との比較
減算をして偏差重量を求め、比較判別手段により
その偏差重量が所定時間内に許容範囲値を超える
か否かの比較判別をする。偏差重量が所定時間内
に許容範囲値を超える場合にはそのときの試料重
量をその後に入力される試料重量に対する基準値
とし、先の所定時間を再設定する。偏差重量が所
定時間内に許容範囲値を超えない場合には、演算
手段により最後に検出された試料重量と加熱前の
試料重量とから水分率を演算して求める。 In the figure, the sample weight before heating is detected by the sample weight detection means, and this is taken as a reference value. Then, the deviation weight detecting means compares and subtracts the standard value with the sample weight that changes from time to time after heating and drying the sample to obtain the deviation weight, and the comparison determining means determines the deviation weight within a predetermined time. Compare and judge whether or not it exceeds. If the deviation weight exceeds the allowable range value within a predetermined time, the sample weight at that time is used as the reference value for the sample weight input thereafter, and the previous predetermined time is reset. If the deviation weight does not exceed the allowable range value within a predetermined time, the calculation means calculates the moisture content from the last detected sample weight and the sample weight before heating.
以下図面を参照して本発明の自動水分計の実施
例を説明する。 Embodiments of the automatic moisture meter of the present invention will be described below with reference to the drawings.
（実施例（第２図〜第４図））
第２図は、本発明の自動水分計の実施例の全体
構成図を示す。(Embodiment (FIGS. 2 to 4)) FIG. 2 shows an overall configuration diagram of an embodiment of the automatic moisture meter of the present invention.
同図において、１は測定される試料粉体を載せ
る試料容器である。３は試料粉体を貯蔵する貯槽
であり、４はフイーダで、後述するCPUからの
充填指令により所定量の試料粉体を試料容器１に
供給する。２−１，２−２は試料容器移動装置で
あり、CPUからの移動指令信号により、試料容
器移動装置２−１は試料容器１を貯槽３から後述
する試料粉体を加熱しかつ重量測定をする加熱・
重量測定部と試料粉体排出部とに送り、試料容器
移動装置２−２はその逆の動作を行なう。５はニ
クローム線などで構成される熱源で熱源制御装置
６に接続されており、熱源制御装置６はCPUか
らの指令信号に従つて熱源５に電流を流したり、
断つたりする制御を行なう。７は試料排出装置で
あり、ブロワ８に接続されている。ブロワ８の近
傍には試料排出口７1とエヤー排気口７2が設けら
れている。ブロワ８はCPUからの指令信号を受
けて、試料容器１に載せられている試料粉体を吸
引し、試料粉体は試料粉体排出口７1を介して外
部に排出し、エヤーはエヤー排気口７2を介して
大気中に排気する。１０は天びん皿、９は天び
ん、１１は重量変換器であり、天びん皿１０に載
つている試料容器１と試料粉体の重量を測定し、
重量変換器１１からアナログ量に変換された電気
信号が出力される。１２はAD変換器・インター
フエースで、重量変換器１１から入力されるアナ
ログ信号をデジタル信号に変換し、インターフエ
ース１６を介してCPUに入力する。１０は表示
器で、CPUで求められた試料粉体の水分率を表
示する。１８はキイボードなどを備えた入力装置
で、その入力信号はインターフエース１６を介し
てCPUに入力される。このキイボード１８は、
プロセスの結果によつては、水分率で表示せず、
乾燥終了時の試料重量で表示させる必要のある場
合に、表示器１９の表示モードを切換えたり、ま
た測定終了点を検出する複数種類の許容範囲値±
ｌなどが書込まれているROM１４から任意のも
のを選択するための入力装置として使用するもの
である。１３はCPUである。１４はROMで、前
回重量測定した試料粉体自体の重量と今回重量測
定した試料粉体自体の重量との差が或る範囲値以
内にあるか否かを判別する許容範囲値±ｌがあら
かじめ記憶されている。１５はRAMで、試料容
器１自体の重量、即ちいわゆる風袋重量W0が記
憶され、また試料容器１とこれに載せられた試料
粉体との重量W1が記憶され、更にCPU１３にお
いて前記した重量W1から試料容器１自体の重量
W0を差引いた試料粉体自体の重量W10が基準値
として記憶される。そして試料粉体に対する加熱
乾燥が開始されて時々刻々変化する試料粉体自体
の重量を前記した基準値W10から減算し、その偏
差値とROM１４にセツトされている許容範囲値
±ｌとの比較を行ない、所定時間内に許容範囲値
±ｌを超えるならばその時の試料重量を基準値
W11としてRAM１５に新たに記憶させる。この
ような減算、判定動作を反復して行ない、所定時
間内に許容範囲値±ｌを超える場合はその時の試
料粉体自体の重量を基準値としてRAM１５に新
たに記憶させる。このようにして試料粉体自体の
重量がｎ回目に記憶された基準値W1oを中心とし
許容範囲値±ｌを所定時間超えない場合には、試
料粉体中の水分は蒸発してしまつたと判断し、こ
のときの最終の試料重量WoをW1EとしてRAM１
５に記憶させる。なお、タイマ１７から前記した
所定時間がCPU１３に入力される。そして、
CPU１３において第１回目に記憶された試料粉
体自体の重量W10と前記した重量W1EをRAM１
５から読出し、周知の水分率演算式W10−W1E／
W10×100…(1)の式から水分率Ｗを求めるのであ
る。 In the figure, 1 is a sample container in which a sample powder to be measured is placed. 3 is a storage tank for storing sample powder, and 4 is a feeder, which supplies a predetermined amount of sample powder to sample container 1 in response to a filling command from the CPU, which will be described later. Reference numerals 2-1 and 2-2 are sample container moving devices, and in response to a movement command signal from the CPU, the sample container moving device 2-1 moves the sample container 1 from the storage tank 3 to heat sample powder, which will be described later, and to measure the weight. heating to
The sample container moving device 2-2 performs the opposite operation. Reference numeral 5 denotes a heat source composed of a nichrome wire, etc., which is connected to a heat source control device 6, and the heat source control device 6 supplies current to the heat source 5 according to command signals from the CPU.
Perform control such as cutting off. 7 is a sample discharge device, which is connected to the blower 8. A sample discharge port 7 1 and an air exhaust port 7 2 are provided near the blower 8 . The blower 8 receives a command signal from the CPU, sucks up the sample powder placed on the sample container 1, discharges the sample powder to the outside through the sample powder outlet 71 , and uses the air to exhaust the sample powder. Exhaust to atmosphere via port 72 . 10 is a balance pan, 9 is a balance, and 11 is a weight converter, which measures the weight of the sample container 1 and sample powder placed on the balance pan 10,
The weight converter 11 outputs an electrical signal converted into an analog quantity. 12 is an AD converter/interface that converts the analog signal input from the weight converter 11 into a digital signal and inputs it to the CPU via the interface 16. 10 is a display that displays the moisture content of the sample powder determined by the CPU. Reference numeral 18 denotes an input device including a keyboard, and input signals thereof are input to the CPU via the interface 16. This keyboard 18 is
Depending on the process result, the moisture content may not be displayed.
When it is necessary to display the sample weight at the end of drying, the display mode of the display 19 can be changed, and multiple types of tolerance values ± can be used to detect the measurement end point.
It is used as an input device for selecting an arbitrary item from the ROM 14 in which ``l'' etc. are written. 13 is a CPU. 14 is a ROM in which a tolerance range value ±l is preset for determining whether the difference between the weight of the sample powder itself weighed last time and the weight of the sample powder itself weighed this time is within a certain range value. remembered. A RAM 15 stores the weight of the sample container 1 itself, that is, the so-called tare weight W0 , and also stores the weight W1 of the sample container 1 and the sample powder placed thereon. W 1 to the weight of the sample container 1 itself
The weight W 10 of the sample powder itself after subtracting W 0 is stored as a reference value. Then, the weight of the sample powder itself, which changes from moment to moment after heating drying of the sample powder is started, is subtracted from the above-mentioned reference value W10 , and the deviation value is compared with the allowable range value ±l set in the ROM 14. If the allowable range value ±l is exceeded within the specified time, the sample weight at that time is set as the standard value.
It is newly stored in the RAM 15 as W 11 . Such subtraction and determination operations are repeated, and if the allowable range value ±l is exceeded within a predetermined time, the weight of the sample powder itself at that time is newly stored in the RAM 15 as a reference value. In this way, if the weight of the sample powder itself does not exceed the allowable range ±l for a predetermined period of time centered around the nth memorized reference value W1o , the water in the sample powder will evaporate. At this time, we decided that the final sample weight W o was W
5 to be memorized. Note that the above-mentioned predetermined time is input from the timer 17 to the CPU 13. and,
The weight W 10 of the sample powder itself stored for the first time in the CPU 13 and the weight W 1E mentioned above are stored in the RAM 1.
5 and use the well-known moisture content calculation formula W 10 −W 1E /
W 10 ×100…The moisture content W is determined from the formula (1).
第３図は試料粉体自体の重量を縦軸に、時間を
横軸にとり、加熱乾燥を開始してからの試料粉体
の重量変化グラフである。W10は、前に説明した
ように試料粉体自体の重量で、この値と加熱によ
り時々刻々変化する試料粉体自体の重量との減算
を行ない、その値が許容範囲値±ｌを超える時
に、その時の試料粉体自体の重量W11が基準値と
してRAM１５に新たに記憶される。W12，W13，
W1oについても同様にRAM１５に記憶される。
そしてW1oから時々刻々変化する試料粉体自体の
重量Woを減算した値が、許容範囲値±ｌを所定
時間にわたつて超えない場合に、試料粉体の乾燥
は終了したと判定する。 FIG. 3 is a graph of changes in the weight of the sample powder after the start of heat drying, with the weight of the sample powder itself taken as the vertical axis and time taken as the horizontal axis. As explained earlier, W 10 is the weight of the sample powder itself, and this value is subtracted from the weight of the sample powder itself, which changes from time to time due to heating, and when the value exceeds the allowable range value ±l, , the weight W 11 of the sample powder itself at that time is newly stored in the RAM 15 as a reference value. W 12 , W 13 ,
W 1o is also stored in the RAM 15 in the same way.
Then, when the value obtained by subtracting the weight W o of the sample powder itself, which changes from time to time, from W 1o does not exceed the allowable range value ±l for a predetermined period of time, it is determined that the drying of the sample powder has been completed.
次に以上のように構成された装置の作用を説明
する。 Next, the operation of the apparatus configured as above will be explained.
測定を終了した試料容器１は、試料容器移動装
置２−１により試料排出装置７の直下に移動させ
られ、ブロワ８がCPU１３から指令信号を与え
られて回転駆動され、試料容器１に載せられた試
料粉体を吸込み、試料排出口７1から排出し、排
出空気口７2からエヤーが排気される。試料排出
動作が終了すると、CPU１３から試料容器移動
装置２−２に指令信号が与えられ、試料容器１を
試料貯槽３の位置する所に送るのであるが、天び
ん皿１０を通過する際に試料容器１自体の重量、
即ちいわゆる風袋重量W0を測定し、重量変換器
１１から出力される電気信号をAD変換器１２に
加え、そのデジタル出力信号をCPU１３を介し
RAM１５に記憶させる。CPU１３からフイーダ
４に指令信号が加えられると、試料貯槽３の下に
位置する試料容器１に所定量の試料粉体を供給す
る。その際、試料容器１はCPU１３から指令信
号を受けた試料容器移動装置２−１によりゆつく
りと移動させられるので、一様な厚みをもつて試
料粉体が試料容器１に載置される。所定量の試料
粉体の供給が終了すると、試料容器移動装置２−
１にCPU１３から指令信号が与えられ、試料容
器１を天びん皿１０に送る。このとき、試料容器
それ自体の重量W0と試料粉体とを加えた総重量
W1が測定され、この重量値は重量変換器１１に
より電気信号に変換され、AD変換器１２により
デジタル信号に変換されてCPU１３に入力され、
その総重量W1から試料容器１自体の重量W0を減
算し、得られた試料粉体自体の重量W10を基準値
としてRAM１５に記憶させる。CPU１３から熱
源制御装置６に指令信号が与えられ、熱源制御装
置６は熱源５に通電を開始して試料容器１の試料
粉体を加熱する。この加熱により試料粉体から水
分が蒸発して行き、その時々刻々に変化する重量
が天びん９により測定される。一方、ROM１４
には、重量変化の許容範囲値±ｌがあらかじめセ
ツトされている。CPU１３には重量変換器１１
から出力される時々刻々変化する試料重量がAD
変換器１２を介して入力される。基準値W10とそ
の試料重量との比較減算を行ない、比較減算の結
果得られた偏差重量がタイマ１７により設定され
た所定時間内にROM１４にセツトされている許
容範囲値±ｌを超えるか否かの比較判定をする。
偏差重量が所定時間内に許容範囲値±ｌを超える
場合にはそのときの試料重量を基準値W11として
RAM１５に記憶させる。このような比較動作を
反復し、RAM１５にW12，W13，…W1oの値を記
憶させる。そして、W1の値と時々刻々変化して
入力される試料重量との差が所定時間の間に
ROM１４にセツトされた許容範囲値±ｌを超え
ない場合には、試料粉体に含まれる水分は蒸発し
てしまつたと考えられるので、前記した場合には
CPU１３は加熱乾燥終了点に至つたと判断する。
これにより、CPU１３から熱源制御装置６に指
令信号が与えられ、熱源５への通電を停止する。
同時に、CPU１３は、そのときの最終の試料重
量Woを最終重量W1EとしてRAM１５に記憶さ
せ、そして(1)式WwW10＝W1E／W10×100の演算
を行なつて、試料粉体の水分率Ｗを求め、この値
をインターフエース１６を介して表示器１９に表
示する。次に、CPU１３から試料容器移動装置
２−１に指令信号を与え、試料容器１を試料排出
装置７へ移動させる。 The sample container 1 that has completed the measurement is moved directly below the sample discharge device 7 by the sample container moving device 2-1, the blower 8 is rotated by receiving a command signal from the CPU 13, and is placed on the sample container 1. Sample powder is sucked in and discharged from the sample discharge port 71 , and air is exhausted from the discharge air port 72 . When the sample discharge operation is completed, a command signal is given from the CPU 13 to the sample container moving device 2-2, and the sample container 1 is sent to the location where the sample storage tank 3 is located. The weight of 1 itself,
That is, the so-called tare weight W 0 is measured, the electrical signal output from the weight converter 11 is applied to the AD converter 12, and the digital output signal is sent via the CPU 13.
Store it in RAM15. When a command signal is applied from the CPU 13 to the feeder 4, a predetermined amount of sample powder is supplied to the sample container 1 located below the sample storage tank 3. At this time, the sample container 1 is slowly moved by the sample container moving device 2-1 which receives a command signal from the CPU 13, so that the sample powder is placed on the sample container 1 with a uniform thickness. When the supply of a predetermined amount of sample powder is completed, the sample container moving device 2-
1 is given a command signal from the CPU 13 and sends the sample container 1 to the balance pan 10. At this time, the total weight of the sample container itself W 0 plus the sample powder
W 1 is measured, and this weight value is converted into an electrical signal by the weight converter 11, converted into a digital signal by the AD converter 12, and inputted to the CPU 13,
The weight W 0 of the sample container 1 itself is subtracted from the total weight W 1 and the obtained weight W 10 of the sample powder itself is stored in the RAM 15 as a reference value. A command signal is given from the CPU 13 to the heat source control device 6, and the heat source control device 6 starts energizing the heat source 5 to heat the sample powder in the sample container 1. This heating causes water to evaporate from the sample powder, and the weight, which changes moment by moment, is measured by the balance 9. On the other hand, ROM14
The allowable range value ±l of weight change is set in advance. Weight converter 11 for CPU13
The constantly changing sample weight output from AD
It is input via a converter 12. Compare and subtract the standard value W10 with the sample weight, and check whether the deviation weight obtained as a result of the comparison and subtraction exceeds the tolerance range value ±l set in the ROM 14 within a predetermined time set by the timer 17. Make a comparative judgment.
If the deviation weight exceeds the allowable range value ±l within the specified time, the sample weight at that time is used as the reference value W 11
Store it in RAM15. Such a comparison operation is repeated to store the values of W 12 , W 13 , . . . W 1o in the RAM 15. Then, the difference between the value of W 1 and the input sample weight that changes from moment to moment is determined within a predetermined time.
If the allowable range value ±l set in ROM14 is not exceeded, the water contained in the sample powder is considered to have evaporated, so in the above case,
The CPU 13 determines that the heating drying end point has been reached.
As a result, a command signal is given from the CPU 13 to the heat source control device 6, and the power supply to the heat source 5 is stopped.
At the same time, the CPU 13 stores the final sample weight W o at that time in the RAM 15 as the final weight W 1E , and calculates the formula (1) WwW 10 = W 1E /W 10 ×100 to calculate the sample powder. The moisture content W is determined and this value is displayed on the display 19 via the interface 16. Next, a command signal is given from the CPU 13 to the sample container moving device 2-1 to move the sample container 1 to the sample discharging device 7.
なお、前記した実施例において試料容器１に試
料粉体を載せる場合について説明したが、試料容
器に代えてベルトコンベヤにより試料粉体を搬送
する場合にも、本発明は適用することができる。
この場合、ベルトコンベヤ上に試料供給部、試料
加熱部及び掻き取り式の試料排出部を設けると共
に、ベルトコンベヤに重量測定装置を設ける構成
にする。また、熱源としてニクローム線の如き抵
抗加熱方式以外の高周波加熱方式を用いることも
できる。 In addition, although the case where the sample powder is placed on the sample container 1 was explained in the above-described embodiment, the present invention can also be applied to the case where the sample powder is transported by a belt conveyor instead of the sample container.
In this case, a sample supply section, a sample heating section, and a scraping-type sample discharge section are provided on the belt conveyor, and a weight measuring device is provided on the belt conveyor. Moreover, a high frequency heating method other than a resistance heating method such as a nichrome wire can also be used as the heat source.
第４図において、本発明の自動水分計の制御を
実行するフローチヤートを示す。なお、図中か
らはフローチヤートの各ステツプを示す。 FIG. 4 shows a flowchart for controlling the automatic moisture meter of the present invention. Note that each step of the flowchart is shown in the figure.
本発明の自動水分計を作動させると、ステツプ
においてその制御装置がスタートし、ステツプ
において試料容器１自体の重量、即ちいわゆる
風袋重量W0を天びんで測定し、その値をRAM１
５に記憶させる。ステツプにおいて試料容器１
に試料粉体を載せその総重量W1を測定し、その
値をRAM１５に記憶させる。ステツプにおい
て総重量W1から試料容器１自体の重量W0を減算
し、得られた試料粉体自体の重量を基準値W10と
してRAM１５に記憶させる。ステツプにおい
てCPU１３から熱源制御装置６に加熱開始指令
信号を与え、熱源５に通電を開始し、試料容器１
に載せられている試料粉体を加熱する。ステツプ
において試料粉体自体の重量W10を基準値とし
加熱により時々刻々減少する試料粉体自体の入力
重量を比較減算し、この比較減算した偏差重量値
が所定時間内に許容範囲値±ｌを超えるか否かの
比較判断を行ない、所定時間内に許容範囲値±ｌ
を超える場合には、その時に入力された試料粉体
自体の重量をその後に入力される試料粉体自体の
重量に対し比較減算を行なうための基準値として
RAM１５に記憶させる。そして所定時間内に許
容範囲値±ｌを超えない場合には、試料粉体から
水分が蒸発し乾燥が終了したと判断し、次のステ
ツプに進むのである。これを詳述すると、試料粉
体自体の重量W10と入力される時々刻々減少する
試料粉体自体の重量とを比較減算し、この比較減
算の結果得られた偏差重量が所定時間内にROM
１４に記憶されている許容範囲値±ｌを超えるか
否かの比較判断を行ない、所定時間内に許容範囲
値±ｌを超える場合には、その時に入力された試
料粉体自体の重量を基準値W11としてRAM１５
に記憶させる。次に、その基準値W11と時々刻々
減少する試料粉体自体の重量との比較減算を行な
い、比較減算の結果得られた偏差重量が所定時間
内に許容範囲値±ｌを超えるか否かの比較判断を
し、所定時間内に許容範囲値±ｌを超える場合に
は、その時に入力された試料粉体自体の重量を基
準値W12としてRAM１５に記憶させる。このよ
うな比較判断を複数回反復する。そしてｎ回目に
得られた基準値W1oと入力される試料粉体自体の
重量との比較減算を行ない、比較減算の結果得ら
れた偏差重量が所定時間内に許容範囲値±ｌを超
えない場合には、そのときの試料重量を最終の試
料重量値Woとし試料粉体から水分が蒸発し、加
熱乾燥が終了したと判断する。ステツプ７におい
て、その最終の試料重量値WoをW1EとしてRAM
１５に記憶させると共に、熱源制御装置６に加熱
停止の信号を与えて試料粉体への加熱を停止す
る。ステツプにおいてRAM１５から基準値
W10とW1Eを読出し演算を行なつて水分率を求め
る。ステツプにおいて、得られた水分率を表示
器１９に表示させ、加熱終了した試料容器を試料
排出部に送り、ブロワを回転駆動させ、試料粉体
を吸込んで排出し、ステツプにおいて自動水分
計の制御装置の作動が終了する。 When the automatic moisture meter of the present invention is activated, its control device starts in step, and in step, the weight of the sample container 1 itself, that is, the so-called tare weight W 0 is measured using a balance, and the value is stored in the RAM 1.
5 to be memorized. Sample container 1 in step
A sample powder is placed on the sample powder, its total weight W 1 is measured, and the value is stored in the RAM 15. In step, the weight W0 of the sample container 1 itself is subtracted from the total weight W1 , and the obtained weight of the sample powder itself is stored in the RAM 15 as a reference value W10. In step, the CPU 13 gives a heating start command signal to the heat source control device 6, starts energizing the heat source 5, and closes the sample container 1.
The sample powder placed on the plate is heated. In the step, the weight W 10 of the sample powder itself is used as a reference value, and the input weight of the sample powder itself, which decreases moment by moment due to heating, is compared and subtracted, and the deviation weight value obtained by this comparison and subtraction satisfies the allowable range value ±l within a predetermined time. Compare and judge whether or not it exceeds the allowable range value ±l within a predetermined time.
If it exceeds , the weight of the sample powder itself input at that time is used as a reference value for comparing and subtracting the weight of the sample powder itself input later.
Store it in RAM15. If the allowable range value ±l is not exceeded within a predetermined time, it is determined that the moisture has evaporated from the sample powder and drying has been completed, and the process proceeds to the next step. To explain this in detail, the weight W 10 of the sample powder itself is compared and subtracted from the input weight of the sample powder itself, which decreases from moment to moment, and the deviation weight obtained as a result of this comparison and subtraction is calculated as ROM within a predetermined time.
14, and if it exceeds the allowable range value ±l within a predetermined time, the weight of the sample powder itself input at that time is used as the reference. RAM15 as value W 11
to be memorized. Next, compare and subtract the reference value W 11 with the weight of the sample powder itself, which decreases moment by moment, and check whether the deviation weight obtained as a result of comparison and subtraction exceeds the allowable range value ±l within a predetermined time. A comparative judgment is made, and if the allowable range value ±l is exceeded within a predetermined time, the weight of the sample powder itself input at that time is stored in the RAM 15 as a reference value W12. Such comparative judgments are repeated multiple times. Then, the reference value W 1o obtained for the nth time is compared and subtracted with the weight of the input sample powder itself, and the deviation weight obtained as a result of comparison and subtraction does not exceed the allowable range value ±l within a predetermined time. In this case, it is determined that the sample weight at that time is the final sample weight value W o and that water has evaporated from the sample powder and heating drying has been completed. In step 7, the final sample weight W o is set as W 1E in RAM.
15 and gives a heating stop signal to the heat source control device 6 to stop heating the sample powder. Reference value from RAM15 in step
Read W 10 and W 1E and perform calculations to find the moisture content. In the step, the obtained moisture content is displayed on the display 19, the heated sample container is sent to the sample discharge section, the blower is driven to rotate, the sample powder is sucked and discharged, and the automatic moisture meter is controlled in the step. The operation of the device is terminated.
（発明の効果）
以上説明したように本発明によると、加熱前の
試料重量と加熱乾燥開始後の試料重量とを比較減
算し、比較減算の結果得られた偏差重量が所定時
間内に許容範囲値を超えるか否かの比較判定を
し、超えない場合には試料の加熱乾燥が終了した
と判断して水分率を求める構成としたから、試料
の種類が相違しても、また試料が同一種類であつ
て含水量が相違する場合であつても、乾燥不足や
過剰乾燥による測定誤差を招来することなく正確
に水分率の測定を行なうことができると共に、測
定前に試料の乾燥実験をしたり、試料の乾燥状態
をチエツクする必要もないので、簡単に水分率の
測定を行うことができる。また偏差重量が所定時
間内に許容範囲値を越えた場合には所定時間が経
過するのを待たずに、基準値が更新されるので、
試料の加熱乾燥が現在まだ乾燥中であるのか、乾
燥が正確に終了したのかが時々刻々判別すること
ができる。(Effects of the Invention) As explained above, according to the present invention, the weight of the sample before heating and the weight of the sample after the start of heat drying are compared and subtracted, and the deviation weight obtained as a result of the comparison and subtraction is within the allowable range within a predetermined time. A comparison is made to determine whether the value exceeds the value, and if the value is not exceeded, it is determined that the sample has been heated and dried, and the moisture content is determined. Even if the moisture content differs depending on the type, the moisture content can be accurately measured without causing measurement errors due to insufficient or over-drying. Since there is no need to check the dryness of the sample, the moisture content can be easily measured. Also, if the deviation weight exceeds the allowable range value within a predetermined time, the reference value is updated without waiting for the predetermined time to elapse.
It is possible to determine from time to time whether the sample is still being dried by heating or whether the drying has been completed correctly.
第１図は本発明の機能ブロツク図、第２図から
第４図は本発明の自動水分計の実施例を示し、第
２図はその全体構成図、第３図は加熱乾燥後の試
料重量の変化を示すグラフ、第４図はフローチヤ
ートを示す。
図中、１は試料容器、２−１と２−２は試料容
器移動装置、３は試料貯槽、４はフイーダ、５は
熱源、６は熱源制御装置、７は試料排出装置、８
はブロワ、９は天びん、１１は重量変換器、１２
はAD変換器、１６はインターフエース、１７は
タイマ、１３はCPU、１４はROM、１５は
RAM、１９は表示器を示す。
Fig. 1 is a functional block diagram of the present invention, Figs. 2 to 4 show examples of the automatic moisture meter of the present invention, Fig. 2 is its overall configuration diagram, and Fig. 3 is the weight of the sample after heating and drying. FIG. 4 shows a flowchart. In the figure, 1 is a sample container, 2-1 and 2-2 are sample container moving devices, 3 is a sample storage tank, 4 is a feeder, 5 is a heat source, 6 is a heat source control device, 7 is a sample discharge device, 8
is a blower, 9 is a balance, 11 is a weight converter, 12
is AD converter, 16 is interface, 17 is timer, 13 is CPU, 14 is ROM, 15 is
RAM, 19 indicates a display device.
Claims (1)
量を基準値とし、前記基準値と加熱開始後の試料
重量とを比較減算して偏差重量を検出する手段
と、前記偏差重量検出手段からの出力が設定され
た所定時間内に許容範囲値を越えるか否かを比較
判別する手段と、前記偏差重量が所定時間内に許
容範囲値を越えたときの試料重量を前記基準値と
し、前記所定時間を再設定する手段と、前記した
加熱前の試料重量と前記偏差重量が所定時間内に
許容範囲値を越えないときの試料重量から水分率
を求める演算手段とからなる自動水分計。1. A sample weight detection means, a means for detecting a deviation weight by initially using the sample weight before heating as a reference value, and comparing and subtracting the sample weight after starting heating with the reference value, and means for comparing and determining whether the output exceeds the allowable range value within a set predetermined time; and a means for comparing and determining whether the output exceeds the allowable range value within a predetermined time; An automatic moisture meter comprising means for resetting the time, and calculating means for calculating the moisture content from the sample weight when the sample weight before heating and the deviation weight do not exceed the allowable range value within a predetermined time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15849283A JPS6050435A (en) | 1983-08-30 | 1983-08-30 | Automatic moisture meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15849283A JPS6050435A (en) | 1983-08-30 | 1983-08-30 | Automatic moisture meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6050435A JPS6050435A (en) | 1985-03-20 |
| JPH052936B2 true JPH052936B2 (en) | 1993-01-13 |
Family
ID=15672921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15849283A Granted JPS6050435A (en) | 1983-08-30 | 1983-08-30 | Automatic moisture meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6050435A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2692990A1 (en) * | 1992-06-25 | 1993-12-31 | Rougie Sa | Determining water content of defatted product - by automatically heating to dryness, washing with solvent and reheating to determine moisture content |
| IT1275301B (en) * | 1995-06-05 | 1997-08-05 | M G Braibanti Spa | PROCEDURE FOR MEASURING HUMIDITY IN A DRYING LINE |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54111889A (en) * | 1978-02-09 | 1979-09-01 | Motorola Inc | System for measuring moisture content |
| JPS5821541A (en) * | 1981-07-31 | 1983-02-08 | Shimadzu Corp | Electronic moisture meter |
-
1983
- 1983-08-30 JP JP15849283A patent/JPS6050435A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54111889A (en) * | 1978-02-09 | 1979-09-01 | Motorola Inc | System for measuring moisture content |
| JPS5821541A (en) * | 1981-07-31 | 1983-02-08 | Shimadzu Corp | Electronic moisture meter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6050435A (en) | 1985-03-20 |
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