JP2001221440A - High-frequency heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-frequency heating apparatus in which degradation in measurement accuracy ascribable to secular change in a weight measurement means and a breakage of the means can be prevented. SOLUTION: This apparatus is provided with a magnetron 7 for heating a sample W containing water by means of a high frequency current, a plate 4 for placing the sample W, a weight sensor 2 for measuring the weight of the sample W, a CPU 31 for calculating a moisture content in the sample W from the weight of the sample W before and after the high-frequency heating, and a raising/lowering motor 13 for moving the plate 4. Thus the weight of the plate 4 is applied to the sensor 2 in a weight measurement, but the weight of the plate 4 is not applied to the sensor 2 when a weight measurement is not taken place.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating apparatus for heating a sample containing water or the like by high-frequency waves and measuring characteristics of the sample such as the weight loss and the reduction rate of the sample.

[0002]

2. Description of the Related Art An apparatus for measuring the weight loss or the rate of weight reduction of a sample by heating the sample with high frequency is disclosed in, for example, Japanese Patent Application Laid-Open No.
No. 531. This apparatus measures the amount of water contained in the mortar from the weight of the mortar that is reduced by high-frequency heating. This is used to measure the amount of water contained in the mortar at the construction site, determine the water-cement ratio, and manage the strength and the like of the mortar.

According to the publication, first, the weight of a mortar placed on a tray is measured by weight measuring means comprising a piezoelectric sensor. Next, the mortar is subjected to high-frequency heating by a magnetron for a predetermined time, and then the weight is measured again. Then, the amount of water contained in the mortar is calculated from the difference in the weight of the mortar, and the water-cement ratio is calculated based on the cement mixing ratio (ratio between cement and sand or gravel) inputted by a keyboard. ing. The measurement result is displayed on a display so that the user can know the water-cement ratio.

[0004]

However, according to the above-mentioned conventional high-frequency heating apparatus, the measured water-cement ratio is only displayed on a display. For this reason,
It is necessary for the user to copy the measurement data, which complicates the operation and causes erroneous writing. Since the data can be modified, there is a problem that the copied measurement data cannot be proved to be the actual measurement result.

In addition, since the weight of the tray and the mortar is constantly applied to the weight measuring means during the operation of the apparatus, the weight measuring means has a problem that the measurement accuracy is deteriorated due to distortion with time. Even when the apparatus is not in operation, the weight of the pan is added to the weight measuring means. It may be damaged.

Further, if the mortar is overheated by high-frequency heating or uneven heating occurs, the mortar may burst.
For this reason, there is a problem that the weight of the mortar changes by an amount scattered due to the burst, so that accurate measurement cannot be performed, and that the mortar ruptures during the weight detection, and that the impact is transmitted to the weight measuring means, thereby lowering the measurement accuracy.

When sea sand is used for mortar,
Insufficient removal of the salt causes corrosion of the reinforcing steel used in the concrete building, which leads to a reduction in the life and strength of the concrete. However, the conventional high-frequency heating device has a problem that the state of removal of the salt cannot be known and cannot be managed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-frequency heating apparatus which simplifies the operation of a user, obtains accurate measurement data, and can easily prove that the measurement has been performed. Another object of the present invention is to provide a high-frequency heating device capable of preventing deterioration of measurement accuracy due to a change with time of the weight measuring means and breakage of the weight measuring means.

Another object of the present invention is to provide a high-frequency heating apparatus capable of preventing deterioration of measurement accuracy due to rupture of a sample. Another object of the present invention is to provide a high-frequency heating device capable of managing the state of removal of salt contained in a sample.

[0010]

In order to achieve the above object, the present invention provides a high frequency heating means for high frequency heating a sample,
Weight measuring means for measuring the weight of the sample; calculating means for calculating characteristics of the sample based on the weight of the sample before and after high-frequency heating; and output means for outputting a calculation result by the calculating means. It is characterized by:

According to this configuration, when the sample is placed in the storage, the weight of the sample before heating is measured by the weight measuring means. After the sample is subjected to high-frequency heating by a high-frequency heating means such as a magnetron for a predetermined period, the weight of the sample is measured by the weight measuring means. From the weight of the sample before and after heating, the characteristics of the sample are obtained by calculation by the calculation means. The calculation result is output from an external storage device external to the high-frequency heating device, such as a display device or a printer built in the high-frequency heating device, or an output unit such as a data transmission unit using a cable or wirelessly to a printer or the like. .

As a result, accurate data can be stored in a medium such as paper or a magnetic recording medium. Here, the characteristics of the sample include a tare weight before and after heating the sample, a weight reduction amount, a reduction rate, and the like. Further, for example, when the sample is mortar, the amount of water contained in the mortar can be obtained from the reduction amount and the reduction ratio, and the characteristics of the sample such as the water-cement ratio can be calculated based on the known cement mixing ratio. In addition, the characteristics of the sample such as the strength and durability of the concrete can be calculated by comparing with the database stored from the water content.

Further, the present invention provides a high-frequency heating means for heating a sample with high frequency, a weight measuring means for measuring the weight of the sample, and a characteristic of the sample based on the weight of the sample before and after high-frequency heating. It is characterized by comprising arithmetic means and salt detecting means for detecting the amount of salt contained in the sample. According to this configuration, the characteristics of the sample such as the weight loss and the reduction rate are determined by high-frequency heating, and at the same time, for example, the electrical resistance of the sample and the salt concentration in the evaporated water are measured by the salt detection means. Thus, the amount of salt contained in the sample is detected.

Further, the present invention provides a high-frequency heating means for high-frequency heating a sample, an installation portion for installing the sample, a weight measuring means for measuring the weight of the sample, and a method for measuring the weight of the sample before and after the high-frequency heating. Calculating means for calculating the characteristics of the sample;
A moving unit for moving the installation unit or the weight measuring unit, wherein the moving unit applies a load of the installation unit to the weight measuring unit when performing weight measurement and the weight when the weight measurement is not performed. The load of the installation portion is not applied to the measuring means.

According to this configuration, when the sample is placed on the installation section provided in the storage, the installation section or the weight measuring means is moved by the moving means to a position where the load of the installation section is applied to the weight measuring means. Then, the weight of the sample before heating is measured by the weight measuring means. After the installation section is retracted by the moving means so that no load is applied to the weight measuring means, the sample is subjected to high-frequency heating by high-frequency heating means such as a magnetron. When the heating is completed, the installation unit or the weight measurement unit is moved by the movement unit to a position where the load of the installation unit is applied to the weight measurement unit. After the weight of the heated sample is measured again by the weight measuring means, the sample is retracted. Also,
When the operation of the high-frequency heating device is stopped, the installation unit is retracted by the moving unit so that the load of the installation unit is not applied to the weight measuring unit.

Further, the present invention is characterized in that in the high-frequency heating apparatus having the above-mentioned structure, an auxiliary power supply for supplying power to the moving means when power supply from the main power supply is cut off is provided. According to this configuration, the high-frequency heating device is driven by being supplied with power from a main power supply such as a commercial power supply, a generator, and a battery. When the main power is turned off during the weight measurement, power is supplied to the moving means by the auxiliary power supply, and the sample is retracted by the moving means so that no load is applied to the weight measuring means.

Further, the present invention provides a high-frequency heating means for heating a sample with high frequency, a weight measuring means for measuring the weight of the sample, and a characteristic of the sample based on the weight from the weight of the sample before and after high-frequency heating. Calculating means for performing weight measurement by the weight measuring means at predetermined intervals after the start of high-frequency heating, and varying one or both of the heating time and heating output by the high-frequency heating means based on the measurement result. It is characterized by.

According to this configuration, the weight of the sample is measured every predetermined time after the start of heating by the high-frequency heating means, and the heating time and heating output by the high-frequency heating means are varied based on the measurement result. For example, when the weight loss of the sample calculated by the calculating means is smaller than a predetermined value, it is considered that most of the water contained in the sample has already been removed, and the high-frequency heating is stopped, or the weight loss of the sample is reduced. Is large, the heating output can be reduced and the heating time can be prolonged so that the temperature does not rise sharply.

Further, the present invention is characterized in that, in the high-frequency heating device having the above-mentioned configuration, the driving of the high-frequency heating means is stopped during the weight measurement by the weight measuring means. According to this configuration, the temperature of the sample is not raised during the weight measurement by the weight measuring means, and the sample is prevented from being ruptured due to the temperature rise of the sample being measured.

The present invention also provides high-frequency heating means for heating a sample with high frequency, weight measuring means for measuring the weight of the sample, and calculation for calculating characteristics of the sample based on the weight of the sample before and after high-frequency heating. And an abnormality detecting means for detecting an abnormality of the sample. According to this configuration, high-frequency heating of the sample is performed by the high-frequency heating means, and when uneven heating of the sample occurs, abnormalities such as rupture, expansion, and cracks of the sample occur. These abnormalities are detected by the abnormality detecting means. Based on the detection result, it is possible to stop the heating, change the conditions, notify, and the like. The abnormality detecting means can detect by the pressure or sound pressure in the storage where the sample is installed.

Further, the present invention is characterized in that, in the high-frequency heating device having the above-described configuration, one or both of a heating time and a heating output by the high-frequency heating means are varied based on a detection result by the abnormality detecting means. According to this configuration, the temperature of the sample is increased by the high-frequency heating, and the abnormality detection means detects a rupture of the sample or a sign of rupture such as abnormal sound due to expansion or cracking of the sample. Based on the detection result, for example, the heating output by the high-frequency heating means or the heating time is changed to prevent the sample from bursting, or the heating is stopped.

Further, the present invention provides the high-frequency heating apparatus having the above-mentioned configuration, wherein when the abnormality detecting means detects the rupture of the sample, one or both of the heating time and the heating output by the high-frequency heating means at the next high-frequency heating. Is varied. According to this configuration, the temperature of the sample increases due to the high-frequency heating, and the uneven heating increases,
When the rupture of the sample is detected by the abnormality detecting means, the heating output is suppressed, the heating time is shortened, and the like in the next high-frequency heating.

Further, the present invention is characterized in that in the high-frequency heating device having the above-mentioned configuration, there is provided a notifying means for notifying a user of an abnormality based on a detection result by the abnormality detecting means. According to this configuration, sample rupture, expansion,
When an abnormality such as a crack is detected by the abnormality detecting means, the abnormality is notified by the notifying means to call the user's attention.

Further, the present invention is characterized in that in the high-frequency heating apparatus having the above-mentioned structure, input means for inputting data relating to the sample is provided, and characteristics of the sample are calculated based on the data. According to this configuration, before the high-frequency heating by the high-frequency heating means, data on the sample is input by the input means, and the characteristics of the sample are calculated by the calculating means based on the data. For example, when the sample is mortar, by inputting the cement mixing ratio, the water-cement ratio can be calculated from the weight loss of the sample obtained by the measurement.

According to the present invention, in the high-frequency heating apparatus having the above-mentioned configuration, a display unit for displaying data input by the input means and a calculation result by the calculation means is provided.

According to the present invention, in the high frequency heating apparatus having the above structure, the weight of the container into which the sample is put can be input by the input means, and the weight of the sample is calculated by subtracting the weight of the container by the calculating means. It is characterized by doing.

According to the present invention, in the high-frequency heating apparatus having the above-mentioned structure, prior to the high-frequency heating of the sample, the weight of the container in which the sample is placed is measured by the weight measuring means.
The weight of the sample is calculated by subtracting the weight of the container by the calculating means.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view showing a high-frequency heating device according to the first embodiment. In the high-frequency heating device 1, a heating chamber 21 is provided on the left side, and an operation panel 6 is provided on the right side. The sample W is arranged in the heating chamber 21 to perform high-frequency heating.

The operation panel 6 is provided with operation keys 9 (input means) for inputting data on the sample W and the like. Above the operation keys 9, a display unit 8 on which measurement data and input data from the operation keys 9 are displayed is arranged.
Below the operation keys 9, a printer 10 for printing input data and measurement data is provided.

The magnetron 7 is disposed on the right side wall of the heating chamber 21 so as to face the heating chamber 21 so as to heat the inside of the heating chamber 21 by high frequency. On the left side wall of the heating chamber 21, there is provided a salt detection sensor 11 for measuring a salt content of air in the heating chamber 21. Below the pressure sensor, a pressure sensor 22 for detecting a pressure change in the heating chamber 21 is provided.

At the center of the heating chamber 21, a plate 4 on which the sample W placed in the container D is placed is arranged. Below the plate 4, a weight sensor 2 for detecting a weight (hereinafter referred to as “placed weight”) composed of the container D and the sample W placed on the plate 4 via the plate shaft 3 is arranged. The front surface of the heating chamber 21 can be opened and closed by an opening / closing door (not shown).

As shown in FIG. 2, the weight sensor 2 includes an angle 16 attached to the outside of the bottom plate 21a of the heating chamber 21.
It is installed above. Plate shaft 3 integrated with plate 4
Is fitted into a through hole 23a provided in the plate support portion 23, and a lower end thereof is fitted to the support portion 2a of the weight sensor 2 and is supported so as to be vertically movable.

A support 25 for supporting the lever 17 is provided on a side surface of the angle 16. A pin 26 protrudes from the support table 25, and a fitting portion 17a of the lever 17 is fitted to the pin to rotatably support the lever 17. Above and below the right open end of the lever 17, detection switches 12 and 15 that come into contact when the lever 17 rotates in the vertical direction are arranged.

Further to the right of the detection switches 12 and 15,
An eccentric cam 14 that rotates about a motor shaft 13 a of a lifting motor 13 attached to an angle 16 is disposed in contact with a lever 17. The detection switch 12 is connected to the bottom plate 21.
It is fixed to an angle 24 attached to a.

The lifting motor 13 and the eccentric cam 14 are as shown in FIG. The eccentric cam 14 is connected to the motor shaft 13
The distance between a and the outer circumference 14a is a1 at the shortest part and a2 at the longest part in the opposite direction. Therefore, the open end of the lever 17 is moved by the distance a2-a1 due to the rotation of the lifting motor 13.
You can only move up and down.

As shown in FIG. 4, the plate shaft 3 is inserted through an insertion hole 17b provided in the lever 17, and a pin 18 locked by the lever 17 is protruded. The rotation of the elevating motor 13 causes the eccentric cam 14 to
When the longest part from 3a comes into contact with the lever 17,
As shown in FIG. 2, the pin 18 is lifted by the lever 17, and the plate 4 is placed at the retracted position where no load is applied to the weight sensor 2. Then, the upper detection switch 12 is
When N is reached, the lifting motor 13 is stopped, and the plate 4 is held at the retracted position.

The rotation of the lift motor 13 causes the eccentric cam 1 to rotate.
4 is the lever 17 at the shortest part from the motor shaft 13a.
5, the plate 4 descends by its own weight and the lower end contacts the weight sensor 2, as shown in FIG.
Is released from the lever 17. Thereby, the plate 4 is arranged at a measurement position where a load is applied to the weight sensor 2. When the lower detection switch 15 is turned on,
The lifting motor 13 is stopped, and the plate 4 is held at the measurement position. The distance C between the pin 18 and the lever 17 at this time
Is smaller than the distance a2-a1.

FIG. 6 is a block circuit diagram showing a high-frequency heating device according to this embodiment. Switches SW1 and SW2 that are turned on in a closed state are provided on an opening / closing door (not shown). The commercial power supply E has a fuse F and switches SW1 and SW
2, a blower fan 39 for cooling the magnetron 7 (see FIG. 1), a high-frequency heating circuit 38 for transmitting high-frequency waves from the magnetron 7, and an elevating motor 13 can be driven.

The control unit 30 is provided with a CPU 31 for performing various calculations and controlling the system.
Each operation part is driven by the control of. Switch SW2 provided on the door from commercial power supply E
A power supply circuit 32 connected through the power supply generates a power supply for driving the control unit 30.

The CPU 31 is connected to a memory 40 comprising a RAM and a ROM, and stores various data. The elevating motor drive circuit 36 turns on the relay R3 at a predetermined time in accordance with an instruction from the CPU 31, and drives the elevating motor 13. The high-frequency heating drive circuit 37 switches the relay R2 ON in accordance with an instruction from the CPU 31, and drives the high-frequency heating circuit 38. Thereby, a high frequency is transmitted from the magnetron 7 (see FIG. 1).

The display circuit 41 controls the display unit 8 in accordance with an instruction from the CPU 31, and displays measured data, input data, and the like. The operation circuit 42 converts data input by the operation keys 9 into predetermined data, and
31. The notification unit 48 includes a buzzer, a lamp, and the like, and issues a warning by voice or a blink of a lamp according to an instruction of the CPU 31 at a predetermined time. A warning may be displayed on the display unit 8.

The weight sensor circuit 43 converts the deviation of the weight sensor 2 into the weight of the object placed on the plate 4 and outputs the weight. Further, as will be described later, the CPU 31 calculates the amount of water contained in the sample W from the calculation formula stored in the memory 40 based on the output data of the mounted weight. The printer drive circuit 44 is a CPU
The printer 10 is driven in accordance with the instruction 31 to print predetermined data.

The rupture detection circuit 45 compares the detection result of the pressure sensor 22 for detecting the pressure in the heating chamber 21 with the data stored in the memory 40 in advance and detects the destruction of the sample or the destruction such as expansion or crack. It is determined whether or not there is a sign, and a result of the determination is output. Although the sample W thermally expands due to heating, a crack is generated in the sample W at the time of expansion before rupture, and pressurized water vapor or the like inside the sample is ejected from a gap between the cracks. Can easily be detected. It is also possible to detect an abnormal sound of a crack using a sound pressure sensor to detect a sign of a burst.

The salinity detecting circuit 46 includes the salinity detecting sensor 11
The amount of salt contained in the water vapor in the heating chamber 21 is calculated and output from the salt concentration in the heating chamber 21 (see FIG. 1) detected by the above. The plate position detection circuit 47 is a lifting motor 1
In response to switching of the detection switches 12 and 15 which are turned on and off by the lever 17 which is raised and lowered by the switch 3, the timing of stopping the lifting motor 13 and the timing of measuring the weight by the weight sensor 2 are output.

The auxiliary power supply 34 connected to the commercial power supply E via the rectifier circuit 33 comprises a rechargeable battery. When the power from the commercial power source E is stopped, the power is supplied to the lift motor 13 and the lift motor
4 is turned on so that the lifting motor 13 can be driven.

The relay R1 is switched at a predetermined timing by the control unit 30 to drive the blower fan 39 to cool the magnetron 7. SW3 is a switch for monitoring the welding of the contacts of SW1 and SW2. Thus, if the door is opened at the time of welding the contacts of SW1 and SW2, the fuse F is blown and the high-frequency heating circuit 38 cannot be driven.

The operation of the high-frequency heating apparatus having the above-described configuration will be described with reference to the flowcharts of FIGS. 7 and 8, taking the case where the sample W is mortar as an example. 7, sample data such as the type of the sample W and the cement mixing ratio α of the mortar is input by the operation keys 9 in step # 101,
0 is stored. At this time, the weight of the container D containing the sample W (hereinafter, referred to as “container weight”) Y0 may be input, and if input, is stored in the memory 40.

In step # 102, it is determined whether or not the container weight Y0 has been input. If the container weight Y0 has not been input, only the container D is placed on the plate 4 in step # 103, the container weight Y0 is measured by the weight sensor 2, and the result is stored in the memory 40. Next, the sample W placed in the container D is placed on the plate 4, the placed weight S 0 is measured by the weight sensor 2, and the measurement result is stored in the memory 40.

Weight of sample W (hereinafter referred to as "sample weight")
W0 is represented by W0 = S0-Y0, and step # 105
Then, this calculation is performed by the CPU 31 (calculation means), and the sample weight W0 before heating is stored in the memory 40. If the amount of the sample W is too large or too small, the measurement error of the weight loss becomes large.
It is determined whether 0 is within a predetermined range. If it is not within the predetermined range, the flow returns to step # 104, where the sample W is mounted again and the mounted weight S0 is measured.

In step # 107, the CPU 31 calculates the heating conditions according to the type and weight of the sample W based on the data stored in the memory 40. Then, based on the heating program stored in the memory 40, high-frequency heating processing by the magnetron 7 is performed in step # 108.

FIG. 8 shows the high-frequency heating process. First, in step # 141, error information in the previous measurement is read from the memory 40. As described later, an error value is stored in the error information when a sample rupture occurs. In step # 142, it is determined whether an error value is stored. If no error value is stored, the heating output P of the magnetron 7 is set to a specified value in step # 143.

When the error value is stored, the previous heating output Pm stored in the memory 40 is read at the same time. Since the sample is ruptured due to the heating output Pm, the heating output P is set to a predetermined value Δ from the previous time in step # 144.
It is set smaller by P (P = Pm-ΔP). Then, the relay R2 is switched by the high-frequency heating drive circuit 37, and the magnetron 7 is driven by the heating output P by the high-frequency heating circuit 38. At the same time, the relay R1 is switched to drive the blower motor 39. Thereby, the moisture contained in the sample W evaporates, and the weight of the sample W decreases.

As will be described later, in this embodiment, the magnetron 7 is stopped based on the measurement result of the mounted weight at any time during the high-frequency heating process. Initialized in # 146. In step # 147, a counter j (j = i-1) indicating the previously measured weight is calculated.

In step # 148, the pressure in the heating chamber 21 detected by the pressure sensor 22 is compared with the data stored in the memory 40 to determine whether the pressure is within a normal range. If normal, the process proceeds to step # 149.
Steps # 148 and # 149 are repeatedly performed until a predetermined time interval elapses for measuring the placement weight Si.

When the predetermined time has elapsed, step # 150
In step # 151, the weight change rate r from the previous mounted weight Sj is calculated. The weight change rate r is represented by r = (Si-Sj) / Sj. In step # 152, it is determined whether the weight change rate r is smaller than a predetermined value. When the weight change rate r is equal to or more than a predetermined value, it is considered that moisture to be evaporated still remains. For this reason,
In step # 154, the counter i is incremented, and the process returns to step # 147. The heating is continued to repeatedly measure the mounted weight Si.

If the weight change rate r is smaller than the predetermined value in step # 152, it is considered that the evaporating water does not remain in the sample W. Therefore, the magnetron 7 is stopped in step # 153, and the process returns to the flowchart of FIG. When the magnetron 7 is stopped for a predetermined heating time, the heating time may be shortened or extended according to the determination in step # 152.

In step # 152, it is determined at the same time whether or not the amount of decrease in the weight Si is greater than a predetermined amount. If it is, it is determined that rapid heating is being performed, and the heating output P is reduced. However, the rupture of the sample W can be avoided.

FIG. 9 is a time chart when the mounted weight is measured. The mounting weight S0 before heating is measured by driving the lifting motor 13 so that the plate 4 is lowered.
When the high-frequency heating is started at time T0, the plate 4 rises. The measurement of the mounting weight Si is performed every predetermined time t,
Each time the plate 4 descends. And the weight change rate r
Becomes smaller than a predetermined value, the high-frequency heating is terminated, and the heating time becomes Tm. Further, as will be described later, the mounted weight Se after the heating is continuously measured, the plate 4 is raised, and the operation of the apparatus is stopped at the time T1.

In step # 148 of FIG. 8, if it is detected that the pressure in the heating chamber 21 is not within the predetermined range and is abnormal, it is determined that the sample W has ruptured.
In 155, the magnetron 7 is stopped. In step # 156, the occurrence of an abnormality such as a sample rupture is notified to the user by the notification unit 48, such as an alarm by a buzzer, a blinking lamp, or a warning display on the display unit 8. Then, in step # 157, the error value and the current heating output P are substituted for the heating output Pm on the memory 40 and stored, and the process is interrupted and terminated.

When the magnetron 7 is stopped normally,
Returning to FIG. 7, in step # 109, the mounted weight Se after heating is subsequently measured. At the same time, salt detection sensor 1
By 1, the salt amount B in the heating chamber 21 is measured. In step # 110, the container weight Y0 is called from the memory 40, and the calculation of the heated sample weight W1 = Se-Y0 is performed by the CPU.
31.

In step # 111, the sample weight W0 and the cement mixing ratio α are called from the memory 40, and the water content H contained in the sample W is determined based on the sample weights W0 and W1 before and after heating.
(= W0−W1) is calculated. Further, the amount of cement C contained in the mortar C = W1 × α is calculated from the cement mixing ratio α. Further, a salt ratio E = B / W0, which is an amount of salt per unit weight of the sample W, is calculated. Then, in step # 112, the water cement ratio a = H / C is calculated.

In step # 113, input data such as sample weights W0 and W1, a cement mixing ratio α, a water-cement ratio a, a salt ratio E before and after heating, measurement data, characteristic data obtained by calculation, and a memory 40 Is displayed on the display unit 8. In step # 114, the user is asked whether to print the data displayed on the display unit 8 or the data such as the mounting weight Si measured during heating.
When printing, the user selects data to be printed from the input data, measured data, characteristic data, and stored data in step # 115 using the operation keys 9, and the printer 10 prints in step # 116.

According to the present embodiment, the user can output necessary data by using an output means such as a main body or a display device or a printer provided outside the main body. Simplification and no miswriting occur. Then, since it is difficult to modify the data, the output data can be saved and the actual measurement result can be easily proved. Output to the outside of the main unit may be an external storage device using a magnetic recording medium or the like, or may be a data transmission unit using a cable or wirelessly.

Incidentally, characteristic data such as the tare weight, weight loss, weight reduction rate, water-cement ratio, etc. of the sample obtained by the calculation, input data such as the cement mixing ratio, and memory such as heating output are stored in the memory. It is possible to output the stored data, the measured data such as the weight of the sample, and the like. Further, other characteristic data such as strength and durability of concrete can be calculated by referring to a database stored in advance in the memory, and this may be output.

Further, since the weight of the plate 4, the container D and the sample W is only added to the weight sensor 2 during the weight measurement, the weight sensor 2 is not distorted by a change with time, and the measurement accuracy is high. Can be maintained. When the apparatus is not operating, the plate 4 is retracted from the weight sensor 2 and the weight of the plate 4 is not added to the weight sensor 2, so that
Further, it is possible not only to prevent distortion due to aging, but also to prevent damage due to vibration or impact applied to the weight sensor 2 during transportation.

Further, since the auxiliary power source 34 is provided, even when the main power source consisting of the commercial power source E is cut off, the lifting motor 13 is driven to easily retreat the plate 4 from the weight sensor 2 so that distortion due to aging changes. And damage during transport can be prevented. The main power supply may be replaced with a commercial power supply, and a generator, a battery, or the like may be used.

When the sample W is ruptured by high-frequency heating, the heating is immediately stopped upon detection by the pressure sensor 22, so that data having a measurement error due to scattering of the sample W is not output, and the accurate measurement result is always obtained. Only output can be done. The abnormality detecting means for detecting an abnormality such as rupture of the sample is not limited to the pressure sensor 22, but may be a sound pressure sensor for detecting a sound pressure in the heating chamber 21.

As shown in FIG. 10, when the plate 4 is lowered and the weight is measured, the magnetron 7
May be stopped (A section) to suppress the temperature rise of the sample W.
This prevents the sample W from being ruptured or cracked during the weight measurement, and prevents the measurement accuracy from deteriorating due to the rupture or the impact of the crack transmitted to the weight sensor 2.

When the sample W is a mortar or the like, the salt ratio E of the mortar can be measured by the salt detection sensor 11, and the removal state of the salt of the sea sand used in the mortar can be easily managed. . Thereby, corrosion of the reinforcing steel used for the concrete building can be prevented, and a decrease in the life and strength of the concrete can be prevented.

Although the salt contained in the water vapor generated by heating the sample W is detected by the salt detection sensor 11, the electric resistance of the sample W is measured before heating to measure the amount of salt contained in the sample. It is also possible.

Next, FIG. 11 is a flowchart for explaining the operation of the high-frequency heating process of the high-frequency heating device of the second embodiment. The configuration and other operations of the high-frequency heating device are the same as those in the first embodiment shown in FIGS. Further, the high-frequency heating by the magnetron 7 is stopped after the elapse of a preset heating time T. In this embodiment, the high-frequency heating process shown in FIG. 11 is called in step # 108 in the flowchart of FIG. 7 of the first embodiment.

Steps # 141 to # 145 are the same as those in FIG.
0 is the same as the flowchart of the first embodiment shown in FIG. In step # 161, the pressure sensor 22
It is determined whether the pressure of the heating chamber 21 detected by the above is not within the range of the predetermined value stored in the memory 40, and whether the sample W has a sign of rupture such as expansion or crack. When the abnormality detecting means is a sound pressure sensor, it is possible to detect the sound pressure of crack generation before rupture and detect a sign of rupture.

In general, when heating unevenness occurs, the sample tends to burst, and when the heating output is low, heating unevenness is less likely to occur. Therefore, if there is a sign of rupture in the sample W, the heating output P of the magnetron 7 is set to the predetermined value ΔP in step # 162.
And the heating time T is lengthened by a predetermined value ΔT. Then, in step # 163, the elapse of the heating time T is monitored, and the operations of steps # 161 to # 163 are repeated. After the elapse of the heating time T, the driving of the magnetron 7 is stopped in step # 164, and the process returns to the flowchart of FIG.

The time chart at this time is as shown in FIG. 12. When the heating time T has elapsed, the high-frequency heating is stopped. The plate 4 is driven by the lifting motor 13.
Is lowered, the mounted weight Se after heating is measured, and the device is stopped at time T1.

According to the present embodiment, the pressure sensor 22 detects a sign of rupture occurring in the sample W, and if there is a sign of rupture, the heating output P or the heating time T of the magnetron 7 is detected.
Can be varied to prevent rupture of the sample W. Thereby, it is possible to prevent a decrease in the weight measurement accuracy due to a weight decrease due to the scattering of the sample W.

In the first and second embodiments, the case where the sample W is mortar has been described. However, the present invention is not limited to this. For other samples containing water, the amount of water can be easily measured by high-frequency heating. can do. The amount of the solvent is not limited to the amount of water, and the amount of the solvent can be measured by evaporating a solvent or the like contained in the sample by high-frequency heating. In addition, the characteristics of the sample are not limited to the weight loss or the water-cement ratio, and other characteristics can be calculated. For example,
The reduction rate of the sample weight due to the heating given by (W1-W0) / W0, and the strength and durability of the concrete can be obtained.

[0077]

According to the present invention, necessary data can be taken out by the output means by the user, so that there is no need to copy the measured data, thereby simplifying the operation and preventing erroneous writing. Since the data cannot be modified, the output data can be saved and the actual measurement result can be easily proved.

Further, according to the present invention, when the sample is mortar or the like, the amount of salt contained in the mortar can be measured by the salt detecting means, and the state of removal of salt from sea sand used in the mortar can be easily determined. Can be managed. Thereby, corrosion of the reinforcing steel used for the concrete building can be prevented, and a decrease in the life and strength of the concrete can be prevented.

Further, according to the present invention, since the weight of the sample is only added to the weight measuring means during the weight measurement, the weight measuring means does not generate distortion due to aging, and the measurement precision is maintained at a high precision. can do. When the apparatus is not in operation, the installation section for installing the sample is evacuated from the weighing means and the weight is not added to the weighing means, which not only prevents distortion due to aging but also causes vibration and Damage due to impact can be prevented.

Further, according to the present invention, since the auxiliary power supply is provided, even when the main power supply such as the commercial power supply is cut off, the sample can be easily retracted from the weight measuring means by the moving means, and the distortion or the transport due to the change with time can be obtained. Damage at the time can be prevented.

According to the present invention, the weight measurement by the weight measuring means is performed at predetermined time intervals, and the heating conditions are varied based on the measurement results. Thereby, for example, when the amount of weight loss is smaller than a predetermined amount, heating is stopped to prevent overheating of the sample, and when the amount of weight loss is larger than the predetermined amount, rapid heating is performed. It is possible to reduce the heating output by judging that the sample is ruptured, thereby avoiding the bursting of the sample.

Further, according to the present invention, since the high-frequency heating means is stopped when the weight measurement is being performed, the temperature rise of the sample is suppressed, and the burst or crack of the sample during the weight measurement is prevented. It is possible to prevent the measurement accuracy from deteriorating due to the impact of a rupture or crack transmitted to the measuring means.

Further, according to the present invention, when the sample is ruptured by high frequency heating, the heating can be stopped immediately upon detection by the abnormality detecting means. As a result, inaccurate measurement data due to weight loss due to scattering of the sample is not calculated, and only accurate measurement results can be always output. The abnormality detecting means can easily detect the rupture or crack of the sample by detecting the pressure or sound pressure in the heating chamber.

Further, according to the present invention, the abnormality detecting means detects signs of rupture such as expansion or cracks generated in the sample,
If there is a sign of rupture, the rupture of the sample can be prevented by changing the heating output and heating time of the high-frequency heating means. Thus, it is possible to prevent a decrease in measurement accuracy due to a decrease in weight due to scattering of the sample.

Further, according to the present invention, since the heating condition of the next high-frequency heating is changed based on the detection result of the sample rupture by the abnormality detecting means, it differs when the sample rupture occurs at the previous measurement. The sample is heated under the heating condition, and the burst of the sample can be prevented.

Further, according to the present invention, when a rupture occurring in a sample is detected by the abnormality detecting means, an alarm is issued, so that the user can be alerted and the user can promptly deal with a trouble. .

Further, according to the present invention, when the sample is mortar, for example, data unique to the sample such as the cement mixing ratio can be input, and an operation based on this data is performed.
Accurate calculation results can be obtained individually for each sample.
Further, since the input data and the calculation result data are displayed on the display unit, the user can check for erroneous input.

Further, according to the present invention, the weight of the container in which the sample is placed can be grasped by input from the input unit or by weight measurement performed prior to the high-frequency heating. Weight can be easily obtained.

[Brief description of the drawings]

FIG. 1 is an external view showing a high-frequency heating device according to a first embodiment of the present invention.

FIG. 2 is a front sectional view showing a state where a plate of the high-frequency heating device according to the first embodiment of the present invention is raised.

FIG. 3 is a perspective view showing an elevating motor and an eccentric cam of the high-frequency heating device according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating an operation of a plate of the high-frequency heating device according to the first embodiment of the present invention.

FIG. 5 is a front sectional view showing a state where the plate of the high-frequency heating device according to the first embodiment of the present invention is lowered.

FIG. 6 is a block circuit diagram illustrating a configuration of the high-frequency heating device according to the first embodiment of the present invention.

FIG. 7 is a flowchart illustrating an operation of the high-frequency heating device according to the first embodiment of the present invention.

FIG. 8 is a flowchart illustrating an operation of a high-frequency heating process of the high-frequency heating device according to the first embodiment of the present invention.

FIG. 9 is a time chart illustrating an operation of a high-frequency heating process of the high-frequency heating device according to the first embodiment of the present invention.

FIG. 10 is a time chart illustrating another operation of the high-frequency heating process of the high-frequency heating device according to the first embodiment of the present invention.

FIG. 11 is a flowchart illustrating an operation of a high-frequency heating process of the high-frequency heating device according to the second embodiment of the present invention.

FIG. 12 is a time chart illustrating an operation of a high-frequency heating process of the high-frequency heating device according to the second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High frequency heating device 2 Weight sensor 4 Plate 7 Magnetron 8 Display part 9 Operation key 10 Printer 11 Salt detection sensor 13 Lifting motor 14 Eccentric cam 17 Lever 22 Pressure sensor 34 Auxiliary power supply 40 Memory D Container W Sample

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirokazu Nishio 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Shuji Takada 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka Incorporated (72) Inventor Takeyuki Ozaki 22-22 Nagaikecho, Abeno-ku, Osaka, Osaka Sharp Corporation (72) Inventor Kuniyoshi Fujikawa 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp Corporation F term (reference) 3K086 AA07 BA08 BB04 CA01 CA12 CB01 CC02 CD27 3L086 AA01 AA07 CB02 CB03 CB04 CB20 CC04 DA20

Claims (15)

[Claims] 1. High-frequency heating means for high-frequency heating a sample, weight measuring means for measuring the weight of the sample, arithmetic means for calculating characteristics of the sample based on the weight of the sample before and after high-frequency heating, Output means for outputting a calculation result by the calculation means. 2. High-frequency heating means for high-frequency heating the sample, weight measuring means for measuring the weight of the sample, arithmetic means for calculating characteristics of the sample based on the weight of the sample before and after high-frequency heating, A high-frequency heating apparatus, comprising: a salt detecting means for detecting an amount of salt contained in the sample. 3. A high-frequency heating means for high-frequency heating the sample, an installation section for installing the sample, a weight measuring means for measuring the weight of the sample, and the sample based on the weight of the sample before and after the high-frequency heating. Calculating means for calculating the characteristics of, and a moving means for moving the installation section or the weight measuring means, by the moving means, the weight of the installation section is applied to the weight measuring means when performing weight measurement, A high-frequency heating device wherein a load of the installation portion is not applied to the weight measuring means when weight measurement is not performed. 4. The high-frequency heating apparatus according to claim 3, further comprising an auxiliary power supply for supplying power to the moving unit when power supply from the main power supply is cut off. 5. High-frequency heating means for high-frequency heating the sample, weight measuring means for measuring the weight of the sample, and calculating means for calculating characteristics of the sample based on the weight of the sample before and after high-frequency heating. A high-frequency heating apparatus, wherein the weight measurement is performed by the weight measuring means every predetermined time after the start of the high-frequency heating, and one or both of the heating time and the heating output by the high-frequency heating means are varied based on the measurement result. Heating equipment. 6. The high-frequency heating device according to claim 5, wherein the driving of the high-frequency heating unit is stopped during the weight measurement by the weight measuring unit. 7. High-frequency heating means for high-frequency heating the sample, weight measuring means for measuring the weight of the sample, arithmetic means for calculating characteristics of the sample based on the weight of the sample before and after high-frequency heating, A high-frequency heating apparatus comprising: an abnormality detection unit configured to detect abnormality of the sample. 8. The high-frequency heating apparatus according to claim 7, wherein the abnormality detecting means detects a pressure or a sound pressure in a storage in which the sample is installed. 9. The heating device according to claim 7, wherein one or both of a heating time and a heating output of the high-frequency heating means are varied based on a detection result by the abnormality detecting means.
Or the high frequency heating device according to claim 8. 10. The heating time and / or heating output of the high-frequency heating means at the time of the next high-frequency heating when the abnormality detecting means detects the rupture of the sample. The high-frequency heating device according to claim 9. 11. The high-frequency heating apparatus according to claim 7, further comprising a notifying unit that notifies a user of an abnormality based on a detection result of the abnormality detecting unit. 12. The high-frequency heating apparatus according to claim 1, further comprising an input means for inputting data relating to the sample, wherein a characteristic of the sample is calculated based on the data. . 13. The high frequency heating apparatus according to claim 12, further comprising a display unit for displaying data input by said input means and a calculation result by said calculation means. 14. The weight of the sample in which the weight of the container in which the sample is placed can be input by the input means, and the weight of the sample is calculated by subtracting the weight of the container by the calculation means. Item 14. The high-frequency heating device according to Item 13. 15. The method according to claim 15, wherein prior to the high-frequency heating of the sample, the weight of the container in which the sample is placed is measured by the weight measuring means, and the weight of the sample is calculated by subtracting the weight of the container by the calculating means. The high-frequency heating device according to any one of claims 1 to 14, wherein: