JPH089527Y2 - Microwave oven equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a microwave oven device equipped with a measuring device for measuring the weight change of a sample.

[Background of the invention]

There is a test method in which a sample is irradiated with microwaves and heated to evaporate and release contained water to measure a weight change of the sample.
In the conventional test method, the sample is heated in a microwave oven, and the weight change at that time is taken out of the oven each time.

[Problems to be solved by the device]

 However, this test method had the following problems.

Since the temperature of the sample is lowered by taking it out of the oven on the way, reheating is required and the efficiency is poor.

 It takes time to put the sample in and out.

The number of times the sample is taken in and out is increased, and problems such as sample spillage tend to occur.

 Automatic operation according to weight change cannot be performed.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a microwave oven device which eliminates the above-mentioned various problems by eliminating an operation of taking out a sample from an oven at the time of weighing. .

[Means for solving the problem]

To this end, the microwave oven device of the present invention comprises means for guiding and supporting the rotation of the turntable, a weight measuring device using the turntable, the sample on the turntable and the guide supporting means as a weight load, and the weight. The turntable rotation drive mechanism unit is provided at a position that does not cause a heavy load on the measuring device, and applies a rotational force to the central portion or the peripheral portion of the turntable, and the turntable on the rear surface central portion or the peripheral portion of the turntable. By engaging the turntable rotation drive mechanism section with the turntable in a direction opposite to the direction of rotation of the turntable, and by slightly reversing the turntable rotation drive mechanism section, the turntable rotation drive mechanism section side turns the turntable. Coupling that separates from the table side, and means that shuts off the weight measuring device from microwaves And configured to include a.

〔Example〕

Hereinafter, a microwave oven device according to an embodiment of the present invention will be described. In the following description, forward rotation means defined rotation in one direction of the rotating body, reverse rotation means defined rotation in the opposite direction of normal rotation, and inversion means rotation that rotates in the opposite direction to the previous rotation. .

FIG. 1 (a) is a schematic diagram showing an overview of the entire oven apparatus of the first embodiment. In the figure, reference numeral 1 is a microwave oven, and microwaves are supplied from a waveguide 2 provided on the upper plate 1a. A turntable 3 is provided in the oven 1. The sample 4 is mounted on the upper surface of the turntable 3 and is rotatably supported by a holding roller 5 provided on the lower surface. The holding roller 5 is mounted on a mounting plate 7 by a support piece 6.

Reference numeral 8 denotes a weight measuring device arranged between the upper surface of the bottom plate 1b of the oven 1 and the lower surface of the mounting plate 7, which includes the mounting plate 7, the supporting piece 6,
The holding roller 5 and the turntable 3 (these are collectively referred to as a sample holding / rotating mechanism portion. In addition, the mounting plate 7, the support piece 6,
The holding roller 5 constitutes means for guiding and supporting the rotation of the turntable 3. ) Is included to measure the weight of the sample. Therefore, the weight of only the sample 4 is calculated by subtracting the tare weight of the known sample holding / rotating mechanism. Alternatively, if the index of the weight measuring device 8 in the state where the sample 4 is not mounted is set to the zero point, the display of the measuring device 8 directly represents the weight of the sample.

If, for example, an electric resistance strain gauge is used as the weight measuring device 8, the weight is first obtained as the strain of a predetermined substance, and then the strain is converted into an electric quantity and taken out of the oven 1 (not shown). ) Then, the quantity of electricity is converted into weight and displayed.

Reference numeral 9 is a drive device disposed outside the lower side of the oven 1, 10 is a rotary shaft that rotates in the forward and reverse directions by the drive device 9, and these constitute a turntable rotary drive mechanism part, and the rotary shaft 10 is the bottom plate of the oven 1. The insertion hole 1c formed in 1b is inserted, and the upper end portion thereof is engaged with the lower surface of the turntable 3 via the coupling 11.

The coupling 11 is composed of an original piece 11a fixed to the upper end of the rotary shaft 10 in an intersecting manner and a pair of follower pieces 11b projecting from the lower surface of the turntable 3 at a target position of the center of rotation. (See FIGS. 1 (b) and (c). Note that, in FIG. 1 (b), the coupling 11 is relatively enlarged and emphasized).

When this original piece 11a is rotated by the rotating shaft 10, the follower piece 11b
When the turntable 3 comes into contact with (see the chain double-dashed line in FIGS. 1B and 1C), the turntable 3 rotates in that direction. Thus, the coupling 11 can transmit the rotational force of the rotating shaft 10 to the turntable 3, but by separating the coupling 11, the vertical load of the sample holding and rotating mechanism can be prevented from being applied to the rotating shaft 10. .

That is, the coupling 11 engages with play in the direction opposite to the turntable rotation direction, and connects the turntable rotation drive mechanism section and the turntable. The turntable rotation drive mechanism part is rotated in one direction to rotate the turntable, and the turntable rotation drive mechanism part side is separated from the turntable side by slightly reversing in the opposite direction.

In addition, the original segment shown by the solid line in FIGS. 1 (b) and (c)
Reference numeral 11a shows a state in which the follower piece 11b is not in contact with the follower piece 11b. In this state, the rotary shaft 10 and the turntable 3 are completely separated. The number of each of the original piece 11a and the follower piece 11b is not limited to this example.

Reference numeral 12 is a control unit for controlling the operation of the drive unit 9, and is adapted to transmit forward / reverse rotation signals to the drive unit 9 through wirings 13 and 14.

Reference numeral 15 is a choke disposed around the weight measuring device 8 for shielding the weight measuring device 8 from microwaves for protection. The chalk 15 is a large number of standing chalk pieces 15a.
The choke pieces 15a are formed by arranging them in the circumferential direction at a pitch of 1 / 4λ of the micro wavelength λ (see FIG. 1 (d)). In order to enhance the microwave blocking effect, a plurality of those arranged in the circumferential direction may be arranged concentrically.

In order to use the device of this example, first, the sample 4 is mounted on the turntable 3 and then the device is brought into an operating state.
As a result, a normal rotation signal is input to the drive unit 9 from the control unit 12 to drive the drive unit 9, and the rotary shaft 10 and the coupling 1
1. The turntable 3 is interlocked forward and the sample 4 rotates at a predetermined speed.

At the same time, the microwave is supplied from the waveguide 2 into the oven 1. As a result, the rotating sample 4 is irradiated with microwaves to generate heat, evaporating and releasing moisture inside, and the weight gradually decreases.

Then, the input of the normal rotation signal is stopped after a predetermined time T1 from the time of inputting the normal rotation signal to the drive device 9, the drive device 9 is stopped, and the rotating shaft 10, the coupling 11, and the turntable 3 are stopped. . After that, a reverse rotation signal is output from the control unit 12 to the drive unit
Is input instantaneously to the rotation axis of the drive device 9
10 and the original piece 11a of the coupling 11 slightly reverses (slightly reverses) and separates from the slave piece 11b. In this state, that is, the weight of the sample is measured by the weight measuring device 8 by the control means which has received the timing signal of the weight measurement, and then the normal rotation signal is again input from the control unit 12 to the drive device 9 at a predetermined time. The same process operation as above is repeated. The time chart of this operation is shown in FIG.

As described above, in this example, the weight can be measured with the sample kept in the oven. Therefore, a heating test can be performed while continuously irradiating the sample with microwaves. In addition, since the coupling is completely separated during the weight measurement, accurate weight measurement is possible.

FIG. 3 is a diagram showing the coupling 16 of the second embodiment. The coupling 16 of this example has a concave and convex portion 2
It consists of one coupling board 16a, 16b. One coupling board 16a is fixed to the tip of the rotary shaft 10 and the other coupling board 16b is fixed to the lower surface of the turntable 3.
The concave and convex portions of a and 16b are meshed with each other.

This coupling 16 can also transmit the rotational force of the rotary shaft 10 to the turntable 3. Since the vertical load of the sample holding / rotating mechanism should not be applied to the rotating shaft 10, the meshing in the axial direction is set roughly and the gap in the rotating direction is set large.

FIG. 4 shows the rotary shaft 10 and the turntable 3 of the third embodiment.
It is a figure which shows the interlocking mechanism part with. In this example, the operation (time chart) is common to that of the first embodiment. That is, the driven pin gear 18 is formed on the peripheral portion of the turntable 3, while the driving pin gear 19 that meshes with the driven pin gear 18 is provided on the upper end of the rotary shaft 10. In this example, the pin gears 18 and 19 form a coupling, and the rotary shaft 10
The two pin gears 18 and 19 are in contact with each other when the rotation is transmitted to the turntable 3, but when the weight is measured, the rotary shaft 10 is slightly reversed in the same manner as in the first embodiment so that both pin gears 1 and 19 are rotated.
8 and 19 are completely out of contact.

FIG. 5 is a diagram of the choke 20 of the fourth embodiment. The choke 20 of this example is formed by forming L-shaped slits 20a on a conductive ring base material 20 at a pitch of 1 / 4λ.

By the way, when measuring the temperature of the sample 4, the oven 1
It is not accurate just to measure the temperature inside. For accurate measurement, it is necessary to measure the sample 4 directly or as close to the sample 4 as possible. For that purpose, it can be proposed to arrange the sensing part of the thermocouple at the sample 4 or at a position close to the sample 4 and connect its conducting wire to the control part 12 to detect the temperature there. However, if the turntable 3 is continuously rotated in this state, the conductor wire may be twisted and damaged.

FIG. 6 is a diagram of an oven apparatus of a fifth embodiment which solves such a problem. In the figure, reference numeral 21 denotes a position detector provided on the bottom plate 1b, which detects the rotational position of the turntable 3 at every 180 degrees and inputs the detection signal to the control unit 12.

In addition, in this example, when the sample container with the handle or the asymmetrical sample is taken out from the oven while solving the above-mentioned problem, the initial position (the position when the sample is set in the oven) is set depending on the stop position of the turntable 3. It also prevents it from becoming difficult to take out.

Therefore, in this example, the turntable 3 is rotated about 18 times.
The turntable 3 is reversed every 0 degrees, and the final stop position of the turntable 3 is returned to the initial position by the control means.

To use the apparatus of this example, first, the sample 4 is mounted on the turntable 3, and then the operation mode is selected. In this mode selection, "Continuous" is set when the thermocouple is not plugged in and "Inverted" when it is plugged in.
Select FIG. 7 shows a flow chart of a program of operation in these cases. The operation when "Continuous" is selected is the same as that of the first embodiment, so the description is omitted.

Therefore, when "reverse" is selected to activate the device, first, the normal rotation signal is input from the control unit 12 to the drive device 9 to drive the drive device 9 in the normal rotation direction, and the microwave is emitted from the waveguide 2 to the oven. Supplied within 1. And turntable 3
Is rotated about 180 degrees, the position detector 21 detects the rotational position, the detection signal is taken in by the control unit 12, and the drive unit 9 is stopped by the control unit 12.

After that, the turntable 3 is rotated about 180 degrees by the reverse rotation signal output from the control unit 12, is returned to the original position, and is stopped. The stop control in this case is also performed by the detection of the position detector 21. After this stop, the drive unit 9 is slightly driven to rotate normally (fine normal rotation: slight reverse rotation) by the input of the normal rotation signal, so that the original piece 11a is separated from the follower piece 11b. In this state, the weight of the sample is measured by the weight measuring device 8.

After that, the normal rotation signal is again input to the driving device 9 from the control unit 12, and the same process operation as above is reversed. In this case, the sample-holding / rotating mechanism is inverted every rotation of about 180 degrees, and is not twisted and damaged even if a thermocouple lead wire or the like is disposed there.

Further, the sample 4 is also inverted by the inversion at every rotation of about 180 degrees, and the object of uniforming the product temperature of the sample 4 can be achieved.

As the position detection device 21, a limit switch,
There are photo couplers, rotary encoders, etc. In addition, in this example, the turntable 3 is detected by the position detector 21.
Although the reversal is controlled every 180 degrees, a timer may be provided in the control unit 12 or the rotation angle of the rotary shaft 10 may be detected and controlled outside the oven 1.

Then, the above "continuous" or "reversal" process is repeated, and the turntable 3 is returned to the initial position and stopped by the control means (not shown) by automatic stop of the heating end or manual stop in the middle before the automatic stop. After the stop, in order to separate the original piece 11a from the driven piece 11b, the driving device 9
Is slightly inverted (reverse inversion or slightly forward). In this case, if the return rotation to the initial position is forward rotation, it is fine reverse rotation, if it is reverse rotation, it is fine forward rotation, and in the case of the "reverse" step, it is always fine forward rotation.

This is the end of the operation. After that, the weight can be measured all the time. Further, since the sample returns to the initial mounting position, handling such as taking out from the oven 1 becomes easy. Therefore, this handling can be automated by a machine.

In addition, in each of the above-mentioned embodiments, in order to reduce the friction of the holding roller 5 to which the weight of the turntable 3 or the like is added so that the holding roller 5 can move freely, it is possible to form a rounded cross section. This can improve the accuracy of weight measurement.

Due to this improvement, the measurement accuracy of 10 g or more was particularly good. For example, a 10 kg sample with a water content (dry basis) of 100% has an absolute dry weight of 5 kg. 10g in 5kg is 0.2%, and according to the present invention, the accuracy of the weighing scale can be sufficiently brought out.

[Effect of device]

As described above, according to the present invention, the weight of the sample can be measured in a state of being mounted in the oven, that is, while irradiating the microwave. Therefore, the test time can be shortened, the operation can be simplified and automated, the sample weight measurement can be made highly accurate, and the efficiency can be improved by the combination of these.

Further, since the coupling provided on the turntable is slightly inverted when the weight is measured and completely separated, the weight measurement accuracy is further enhanced.

If the turntable is turned over every 180 degrees, it is possible to prevent twisting damage due to rotation of the lead wire of the thermocouple inserted to measure the sample temperature.

Furthermore, if the final stop position of the turntable is returned to the initial position, handling of taking out the sample, the sample container and the like from the oven becomes easy.

[Brief description of drawings]

FIG. 1 (a) is a schematic view of a microwave oven apparatus according to the first embodiment of the present invention, FIG. 1 (b) is a perspective view of the coupling, and FIG. 1 (c) is a description of the coupling. FIG. 1 (d) is an explanatory view of the choke portion, FIG. 2 is a time chart of the operation of the oven device, FIG. 3 is an explanatory view of the coupling of the second embodiment, and FIG. FIG. 5 is a perspective view of the turntable portion of the third embodiment, FIG. 5 is a perspective view of the choke of the fourth embodiment, FIG. 6 is a schematic view of the microwave oven apparatus of the fifth embodiment, and FIG. It is a flow chart of an operation program. 1 ... Microwave oven, 3 ... Turntable, 4
…… Sample, 7 …… Mounting plate, 8 …… Weighing device, 9 …… Drive device, 10 …… Rotary shaft, 11 …… Coupling, 11a ……
Master piece, 11b …… Following piece, 12 …… Control section, 15 …… Choke, 16 …… Coupling, 16a, 16b …… Coupling board, 18 …… Driven pin gear, 19 …… Driving pin gear , 20 ……
Choke, 21 ... Position detection device.

Continuation of front page (72) Inventor Kingo Hasebe 2-1-1 Fukuoka, Kamifukuoka City, Saitama Shin-Nippon Radio Co., Ltd. Kawagoe Manufacturing Co., Ltd. (56) Reference JP-A-61-38335 (JP, A) JP Sho 64-3425 (JP, A) Actual public Sho-47-8293 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A microwave oven apparatus comprising a turntable for mounting a sample and rotating in an oven to which microwaves are supplied. Means for guiding and supporting the rotation of the turntable, the turntable, and A weight measuring device having a load on the sample and the guide supporting means on the turntable, and a turn provided at a position where the weight is not applied to the weight measuring device and applying a rotational force to a central portion or a peripheral portion of the turntable. The turntable rotation drive mechanism and the turntable are coupled to each other with play in the direction opposite to the rotation direction of the turntable by engaging the center portion or the peripheral portion of the back surface of the turntable with play. , The turntable rotation drive mechanism side is set to the above by the slight reversal of the turntable rotation drive mechanism portion. A microwave oven device, comprising: a coupling that separates from the turntable side; and a unit that shields the weight measuring device from microwaves.