JPS5880551A - Method and device for measuring reacting weight - Google Patents

Abstract

PURPOSE:To measure reacting weight with high accuracy even if the time when temps. are low continuing for a long period of time by prohibiting the operation of the reacting weight when the detected temps. from reacting systems, the surfaces of the reacting systems or reactors are lower than set lower limit temps. CONSTITUTION:When the detected temps. from reacting systems, the surfaces of the reacting systems or reactors are applied to a microcomputer 10 including a CPU via a temp. detector 2, an A/D converter 6, etc., the rate of reaction is operated and determined by the microcomputer according to the programs of an ROM. The lower limit temp. set with a lower temp. detector 54 is also applied to the CPU, and when the detected temps. drop lower than the lower limit value, a reacting weight 0 is outputted according to the program which prohibits the operation of the reacting weight when the detected temps. are lower than the lower limit value. Thus the accumulation of errors when the temps. are low owing to approximate operations is prevented, and even if the time when the temps. are low continuing for a long time, the reacting weight is measured with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for automatically measuring and controlling the amount of a chemical reaction, such as a reaction amount such as a rubber vulcanization reaction or a polymer material curing reaction.

Generally, in the chemical industry, reaction efficiency is improved by controlling the reaction process.
Increasing product quality and yield is extremely important.

Therefore, as disclosed in Japanese Patent Application No. 54-220iij5 and Japanese Patent Application No. 55-162126, the present applicant has developed a reaction amount measuring device that can easily measure the reaction amount at a work site as a prerequisite for controlling the reaction process. This method is based on the Arrhenius reaction rate equation for chemical reactions, and is calculated as the ratio of the reaction amount after t hours at the temperature T of the reaction system to the reference reaction amount per unit time at the reference temperature T0, that is, the relative reaction amount (equivalent reaction amount ) is calculated by a microcomputer based on the following equation (1) or its approximate equation (2), so that temperature measurement and changes over time in reaction amount can be read at a glance.

However, U: Equivalent reaction amount E: Activation energy R: Gas constant T: Temperature To2 Reference temperature Dl: Temperature coefficient t: Time In reality, calculations using the above equation (1) or (2) are:
For example, the measurement is performed at regular time intervals based on the temperature T obtained from a temperature signal from a temperature detector provided in the reaction system, and preset E, R, T, (i).

In this reaction amount measuring device, when the temperature signal is relatively small, the equivalent reaction amount calculated by the above equation (11 or (2)) will be a very small value, but since it is accumulated over time, the reaction time t is long, the calculated equivalent reaction amount contains a considerable amount of error, and highly accurate measurements cannot be made.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus that can measure the amount of reaction with high precision even when the temperature is low for a long time.

The present invention will be explained below based on one embodiment shown in the drawings.

In FIG. 1, 2 is a temperature sensor, for example a thermocouple, which is inserted into the reaction system, for example the shoulder of the tire to be vulcanized, or brought into contact with the outer surface of the shoulder or the inside of the reaction vessel, for example the mold. This thermocouple 2 generates a temperature signal corresponding to the temperature at the insertion or contact location. This temperature signal is supplied to the amplifier linearizer 4, where it is amplified and linearized.
The digital temperature signal is converted into a digital temperature signal by the /D converter 6 and supplied to the microcomputer 10 via the input/output device 8.

In addition to the digital temperature signal, the microcomputer 10 also receives a reference temperature T set in a reference temperature setting device 12.
. is supplied via the input/output device 14, and the activation energy E set in the activation energy setting device 16 is also supplied via the input/output device 18.

The microcomputer 10 includes a start signal generator 2
After the start signal generated by o is supplied via the input/output device 22, each time the timer 24 receives a command signal generated at fixed time intervals via the input/output device 26,
It is programmed to calculate the equivalent reaction amount using equation (a) or equation (2) using the digital temperature signal at that time, reference temperature T0, and activation energy E. Incidentally, as the start signal generating device 20, the one shown in FIG. 2 is used. This is a limit configured so that the charge stored in the capacitor 30 via the resistor 28 is closed simultaneously when the push button switch 32 or the mold in which the rubber tire to be vulcanized is housed is closed. The start signal is generated by inverting the voltage change across the capacitor 30 caused by discharging the switch 33 or a pulse signal generator that simultaneously generates a pulse signal when the mold is closed, using the inverter 34. If this start signal is supplied during reaction amount calculation by pressing a push button switch, for example, the microcomputer 10 erases all the data measured up to that point and starts a new temperature measurement and calculation. There is a program. In addition, each time the reaction amount is calculated, a reaction amount signal is supplied to the reaction number display 36 via the input/output device 3B, and the reaction amount is displayed. Just as a digital temperature signal is supplied to the temperature display 40 via the input/output device 42 to display the temperature, a signal roughly representing the elapsed time from the start of the reaction is supplied to the temperature display 40 via the input/output device 44 to display the time. The microcomputer 10 is programmed to display the time since the start of the reaction.

In addition, the microcomputer 10 is also configured so that the display can be stopped by the display stop device 4 days.
Has been a hub program. Display stop device 4th is 3rd
As shown in the figure, it has almost the same configuration as the start signal generator 11, but the difference is that the limit switch 33a is closed and the pulse signal generator generates pulses when the mold opens or when the tire is removed from the mold. This is what happens when it is taken out. Therefore, each indicator 36, 40, 46 stops displaying when the mold is opened or when the tire is removed from the mold or when the manual switch 32 is closed. Needless to say, the microcomputer 10 continues to calculate the reaction amount regardless of whether the display has stopped or not. When the reaction is stopped, the current reaction amount, temperature, and time are displayed on each display 36, 40, and 46. Further, the reaction amount and the measured temperature are also configured to be printed on the printer 49 via the input/output device 50. Generally, the higher the frequency of temperature measurement and calculation, the higher the accuracy, but the data output to the printer 49 does not need to be output as often as the temperature measurement frequency and reaction amount calculation frequency, so set the number of prints. If the number of times set in the device 52 is, for example, 2I, the data is printed once every two times the reaction amount is calculated.

Note that if "1" is set, it will be printed every time.

Further, the microcomputer 10 is supplied with a lower limit temperature signal set in the lower limit temperature setter 54 via an input/output device 56, and the microcomputer 10
Each time a command signal is supplied from the timer 12, the digital temperature signal and the lower limit temperature signal are compared, and if the digital temperature signal is lower than the lower limit temperature signal, the reaction amount at that time is set to O, that is, the reaction amount is calculated. The program is designed to prevent this from happening.

For example, in the case of a large reactor such as a tire, it takes a relatively long time for the temperature to rise, and the low temperature state is long. Therefore, when calculating the equivalent reaction amount using the above ω equation or equation (2), the equivalent reaction amount is small at relatively low temperatures, but it accumulates over time, so if the reaction time is long, there will be a considerable error. Therefore, in order to eliminate this error, when the digital temperature signal is below the limit temperature signal, the reaction amount at that time is set to 0. This is the most distinctive feature of this invention.

This reaction amount measuring device compares the lower limit temperature signal set in the lower limit temperature setting device 54 with the digital temperature signal when calculating the reaction amount, and when the digital temperature signal is smaller than the lower limit temperature signal, the Since the reaction amount is treated as 0, measurement errors can be eliminated. In other words, when the digital temperature signal is relatively small, the equivalent reaction amount calculated using the Arrhenius reaction rate equation or its approximate equation will be a very small value, but since it is accumulated over time, if the reaction time t is long, Since the calculated equivalent reaction amount contains a considerable amount of error, in order to eliminate this error, when the digital temperature signal is below the lower limit temperature signal, the reaction amount at that time is set to O. Therefore, the accuracy of measuring the amount of reaction can be improved.

In addition, since the start signal generator 20 is provided, measurement and reaction amount calculation can be automatically started when the mold is closed.
By closing, all the data measured up to that point will be erased and a new temperature measurement and calculation can be started. Also,
Since the printing number setting device 52 is provided, the measured temperature and reaction amount are printed every set number of times during measurement and calculation.

In the above embodiment, a thermocouple is used as the temperature detector, but a platinum resistor or the like may also be used.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a reaction amount measuring device according to the present invention.
FIG. 2 is a circuit diagram of a start signal generating device used in the same device, and FIG. 3 is a circuit diagram of a display stop device used in the same device. 2...Temperature detector, 10...Microcomputer, 2o...Start signal generator, 24.Lotimer,
49...Printer, 52...Print count setting device. Patent applicant Satoshi Shimizu, agent of Sumitomo Rubber Industries, Ltd.

Claims (4)

[Claims] (1) Consisting of a process of obtaining a temperature signal corresponding to the temperature of one part of the inside or outside surface of the reaction system or a container of the reaction system, and a process of calculating the reaction amount based on the temperature signal,
A method for measuring a reaction amount, characterized in that the calculation of the reaction amount is not performed when the temperature signal is below a predetermined lower limit temperature. (2) One temperature detector installed inside the reaction system, on the outside surface of the reaction system, or in the reaction system container, and a calculator that has the function of calculating the reaction amount based on the temperature signal from this temperature detector. A reaction amount measuring device, characterized in that the calculator also has a function of stopping the calculation function when the temperature signal is smaller than a predetermined lower limit temperature signal. (3) The reaction amount measuring device according to claim 2, wherein the calculator has an operation start signal generating device. (4) Claims 2 and 3, characterized in that the above-mentioned calculator has a printer configured to print out the sequentially calculated reaction quantities at every set value of the printing number setting device. Reaction amount measuring device described in Section 1.