JPH0330788B2 - - Google Patents

Description

Detailed Description of the Invention: Industrial Application Field The present invention measures the weight of the object to be heated and controls the heating time, heating temperature, heating output, heating method, etc. according to the weight, thereby achieving automatic heating. The present invention relates to a weight detection device for a heating device that makes it possible to.

Configuration of conventional examples and their problems In conventional manual type high-frequency heating devices, for example, when reheating cold rice, miso soup, etc., cooking vegetables, or thawing frozen foods, the user has to control the weight of the food. It was necessary to measure the weight and set the heating time and heating output according to the weight using a time switch or output selection button. Therefore, it is necessary to perform cumbersome operations such as measuring the weight of the food, setting the heating time, and heating output before starting cooking, and it has been desired to improve the usability.

In addition, high-frequency heating devices with automatic control functions are equipped with sensors, which have been developed in recent years, to detect food surface temperature, water vapor generated from food, etc.
It detects alcohol, etc. and automatically controls food heating time and heating output. However, among these automatic heating devices, those equipped with infrared sensors that detect the surface temperature of food mainly only detect the surface temperature of a part of the food, but cannot detect the internal temperature or heating status. However, the finished product was uneven depending on the shape and weight. On the other hand, products equipped with a gas sensor that detects water vapor, alcohol, etc. generated from food can detect water vapor and produce good results when reheating or cooking raw vegetables and vegetables, but they do not detect water vapor when defrosting food. Foods that do not generate food cannot be detected, so as with the manual type, it is time consuming to measure the weight of the food to be thawed, select the timer volume and output selection key, and then start cooking.

Therefore, in order to eliminate these shortcomings and to ensure good heating without failure, there was a desire for a device that could automatically measure the weight of food and cook with the optimal heating time, heating output, and heating method. .

Purpose of the Invention The present invention solves the above-mentioned problems from the prior art, and enables accurate weight measurement with a simple configuration.
The purpose of this invention is to provide a convenient heating device that is easy to use and can automatically perform good heating without setting the heating time, heating output, or heating method.

Structure of the Invention In order to achieve the above object, the heating device of the present invention incorporates a rotating mounting table, a motor, gears, etc. into a Roberval mechanism composed of a plurality of leaf springs and an aluminum block, and the movement of the Roberval mechanism is controlled by magnets and coils. By adopting a configuration in which the weight is detected, the weight detection device can be made lighter and thinner, and the detection portion can be integrated, making accurate weight measurement possible.

In addition, by doing so, the trouble of setting the heating time, heating output, and heating method is saved, and the optimum heating time and heating output are always automatically set, resulting in stable heating. be.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross-sectional view of a high-frequency heating device that is an embodiment of the present invention. In the figure, reference numeral 1 denotes a heating chamber for storing and heating food, and a door 2 is provided in front of the heating chamber so that it can be opened and closed. 3 is a magnetron that supplies high frequency waves to the heating chamber 1. The high frequency waves oscillated from the magnetron 3 pass through a waveguide 4 and are irradiated onto the object to be heated 6 placed on a rotating plate 5 in the heating chamber 1, thereby heating it. do. The rotating plate 5 is placed on a rotating mounting table 7.
The rotary mounting table 7 is fitted with a shaft 8 passing through an opening provided at the bottom of the heating chamber 1, and the drive of the motor 9 is
The rotation is transmitted to the shaft 8 by the gears 10 and 11, and the rotary mounting table 7 is rotated.

FIG. 2 is a detailed view of the Roberval mechanism, which is a weight detection device, and FIG. 3 is a diagram showing the mechanical components thereof. Next, details of the weight detection device will be explained with reference to FIGS. 2 and 3.

The Roberval mechanism has two aluminum blocks A12 and B13 connected by a plurality of leaf springs 14. The overlapping surfaces of the aluminum block B13 and the leaf spring 14 are fixed by a presser plate 15, and the overlapping surfaces of the aluminum block A12 and the leaf spring 14 are fixed by a magnet mounting plate 16 and a motor mounting plate 17.

A magnet 18 is fixed to the tip of the magnet mounting plate 16, and a coil 19 is fixed to the aluminum block B13.
is fixed, and the weight is detected by this magnet 18 and coil 19.

Further, a drive motor 21 for rotating a rotary shaft 20 is fixed to the motor mounting plate 17 with screws 22, and a gear A24 is fitted to a shaft 23 of the motor 21. A gear B25 is fitted onto the rotating shaft 20, and is housed in a notch in the center of the aluminum block A12. In addition, the rotating shaft 20 is connected to a hole provided in the aluminum block A12 and a bearing 3.
1 prevents rattling in the front, back, left and right directions.

The rotation of the drive motor 21 is controlled by the gear A24,
It is transmitted to the rotating shaft 20 via the gear B25. Furthermore, a rotary mounting table 27 on which a rotary plate 26 is placed is fitted onto the rotary shaft 20, so that the object to be heated 28 is rotated during high-frequency heating so that it can be heated evenly.

FIG. 4 is a sectional view showing the attachment mechanism of the Roberval mechanism. In the figure, 13 is an aluminum block B on the fixed end side of the Roberval mechanism, and 30 is its mounting plate.

The aluminum block B13 is attached to a strong metal mounting plate 30 fixed to the bottom surface of the heating chamber 29 with screws 31 to fix one end of the roberval mechanism, and vibrate the other end to which the rotating shaft 20 is attached.

Further, the aluminum block B13 has a convex shape, and the mounting plate 30 has a concave shape, and since they are fixed at both ends of the convex and concave shapes, the aluminum block B13 can be attached even in a narrow space such as the bottom of the heating chamber 29.

The operation of the above configuration will be explained below.

When the object to be heated 28 is placed on the rotating plate 26, its weight is applied to the free end of the Roberval mechanism via the rotating mounting table 27 and the rotating shaft 20, and is displaced downward in accordance with the weight. This movement is a characteristic of the Roberval mechanism and is always a vertical displacement. When the Roberval mechanism is vibrated by the impact when the object to be heated 28 is placed on it or by the impact subsequently applied to the Roberval mechanism from the outside, it vibrates at a natural frequency corresponding to its weight. This vibration generates an induced voltage in the magnet 18 fixed to the free end and the coil 19 fixed to the fixed end, and by detecting this, the overall weight can be measured. Therefore, the rotating plate 26, the rotating mounting table 27, the motor 21, the gear 2
4, 25. If the weight of the aluminum block A is measured in advance, the weight of only the object to be heated 28 can be measured from the total weight.

If the oscillation of the magnetron is controlled according to the weight of the object to be heated 28, cooking can be performed with optimum heating output and heating time.

As described above, according to this embodiment, by constructing the roberval mechanism with an aluminum block, it can be made lightweight, and the load applied to the free end of the roberval can be reduced as much as possible. As a result, the measurement range of the heated object is expanded, the stress constantly applied to the leaf springs is reduced, stable vibrations are obtained, and the durability of the entire Roberval mechanism is improved.

In addition, by devising the mounting structure of the aluminum block on the fixed end side of the Roberval mechanism and housing the gears and rotating shaft inside the aluminum block on the free end side, the entire weight detection device can be made thinner, and the bottom surface of the heating chamber It has the advantage that it can be installed even in places with little space, such as.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) By constructing Roberbal from aluminum, which has the lowest specific gravity among metals, it is possible to reduce the weight of the entire weight detection device, increase the weight ratio of the heated object to the overall weight, and enable accurate weight measurement. The measurement range is also expanded.

(2) Even when the object to be heated is placed on the plate spring, the load of the motor, gears, rotary mounting table, and aluminum block is always applied to the leaf spring. Vibration is obtained, allowing accurate weight measurement. It also improves the durability of the Roberval mechanism.

(3) By measuring the weight of the object to be heated and controlling the output of the heating function via the control unit, the optimal heating time and heating output can be determined without having to set the heating time, heating output, and heating method each time. Since it can be cooked using a heating method, it is convenient and easy to use without any troublesome effort.

In addition, if the rotating structure is designed to prevent so-called dry firing operation, which is erroneous heating when there is no object to be heated, the device will be safer.

(4) The fixed end side of the Roberval mechanism can be made thinner by making the aluminum block on the fixed end side convex and the mounting plate to which it is attached concave.
Furthermore, by providing a notch in the center of the aluminum block on the free end side and storing the gear and rotating shaft therein, the free end side can also be made thinner. In this way, the weight detection device as a whole can be made compact and has a shape that can easily fit into the bottom of the heating chamber. Therefore, it is also possible to house the weight detection device within the same external dimensions as the conventional heating device.

(5) In heating devices used for high-temperature cooking such as oven cooking, the heat in the heating chamber is transmitted through the rotating mounting table and rotating shaft to the Roberval mechanism, but since the Roberval is composed of an aluminum block, The heat is radiated there, and the heat is not transferred to the weight detector's magnet, coil, or drive motor.
There is no deformation or malfunction due to heat, and stable weight measurement is possible.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view showing the structure of a heating device according to an embodiment of the present invention, Fig. 2 is a sectional view showing the structure of a weight detection section of the heating device, and Fig. 3 is an exploded view of the heating device. , FIG. 4 is a partial cross-sectional view showing the mounting structure of the weight detection section of the heating device. 12... Aluminum block A, 13... Aluminum block B, 14... Leaf spring, 16, 17, 18...
... Magnet, 19 ... Detection coil, 20 ... Rotating shaft,
21... Drive motor, 24... Gear A, 25...
Gear B, 26... rotating plate, 27... rotating mounting table,
28...Object to be heated.

Claims (1)

[Scope of Claims] 1. A heating chamber for storing an object to be heated, means for heating the object to be heated, a rotating mounting table for placing the object to be heated in the heating chamber, and a motor for driving the rotating mounting table. an elastic body that supports the rotary mounting table and the motor; a detector that detects vibrations of the elastic body;
a control device for controlling a heating means, the elastic body constitutes a Roberval mechanism by fixing the upper and lower surfaces of a plurality of block pieces with a plurality of leaf springs at an arbitrary distance; A heating device configured to integrally support a rotating mounting table and a motor, detecting the weight of an object to be heated on the rotating mounting table with the detector, and controlling the heating method and heating time based on the output of the detector. 2. The heating device according to claim 1, which uses a gear as a means for transmitting the rotation of the drive motor to the rotary mounting table. 3. The heating device according to claim 1, wherein a gear for transmitting the rotation of the drive motor to the rotary mounting table is provided in an aluminum block constituting a roberval mechanism. 4. A concave mounting plate for fixing the Roberval mechanism to the bottom of the heating chamber is provided, an aluminum block on the fixed end side is made convex, and the vicinity of both ends of the aluminum block are fixed to the mounting plate. heating device.