JPS5945198B2 - Microwave heating molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microwave heating molding apparatus for continuously heating and molding a heated object, that is, a viscous raw material such as kamaboko or sausage.

Normally, this type of device pumps viscous raw materials such as kamaboko or sausage into a pipe with low dielectric loss placed in a heating chamber, heats the raw materials with microwaves from a magnetron, and then heats and molds the raw materials. It is configured to continuously press out kamaboko, sausage, etc.

In such equipment, microwave heating starts when the raw material is pumped into the pipe in the heating chamber, but since the heating chamber cannot be accessed from the outside, it is not possible to know how much raw material has been pumped into the pipe. Therefore, microwave heating may be started when the raw material is under pressure, that is, when the load is low, and in this case, the magnetron becomes abnormal and is damaged.

Furthermore, the raw material that is pumped into the pipe of the heating chamber during heating normally moves in a constant amount, but for some reason it may become abnormally small, or it may become clogged and become abnormally large.
If the amount decreases, the magnetron will be operated under a low load and the magnetron will be damaged as described above, and if it becomes clogged and the amount increases, the pressure of the raw material will abnormally increase and the pipe etc. will be damaged. The present invention has been made in view of these points, and embodiments of the present invention will be described in detail below with reference to the drawings. In Figure 1, 1
2 is a heating chamber; 2 is a magnetron that supplies microwaves to the heating chamber; 3 is a pipe that extends through the heating chamber 1 and is made of a material with low dielectric loss such as Teflon; and 4 is one end of the pipe. , a hopper for receiving viscous raw materials 5 such as kamaboko and sausages, 6 a pressure pump for pumping the raw materials 5 put into the hopper into the pipe 3, and 7 a connection between the pump 6 and the heating chamber 1; This is a pressure switch section that is installed in the pipe 3 between the pipes 3 and operates based on the abnormal pressure inside the pipe 3, and the details of the switch section will be described later.

FIG. 2 shows the circuit of the above device, where 8 is a commercial power supply, 9 is a motor for the pump 6, and the motor is connected to the first relay coil (
A first relay switch A that is turned on by excitation of (described later)
It is connected to the power source 8 via 10a and B10b.

1 has first, second, and one end connected to one end of the power source 8;
A changeover switch section consisting of a third switch 11a, Ilb, and llc.
The switches 11c operate in opposite directions.

That is, when switched as shown by the solid line, the first and second switches 11a
, 11b are turned off, and the third switch 11c is turned on. 1
2 is a high-voltage DC circuit for applying high DC voltage to the magnetron 2 (composed of a high-voltage transformer 13 and a half-wave voltage doubler rectifier 14), and both ends of the transformer 13 are connected to the first switch 11a and the 31st J relay coil. Third relay switches Al5a and Bl are turned on (by excitation of (described later))
It is connected to the power supply 8 via 5b.

To explain the circuits connected in series to the other ends of the second and third switches 11b and 11c, 16 and 17 are a stop switch and a first start switch that are turned off and on by pressing operations, respectively, and 18a is a second start switch. The second relay switch A, 19, which is turned off by excitation of a relay coil (described later), is a first relay coil.

10c is a first relay switch C connected in parallel to the first start switch 17.

Reference numerals 20, 21, and 22 are first, second, and third circuits connected to the power source 8 via the first switch 11a, and the first circuit 2
0, a time limit coil 23 turns on a time limit switch (described later) several seconds after energization, and a pressure switch section 7 is connected in series to this coil.

The pressure switch section 7 consists of a low pressure switch 24 that is turned on based on abnormally low pressure within the pipe 3, and a high pressure switch 25 that is turned on based on abnormally high pressure. In the second circuit 21, 26 is a second relay coil, 27 is a time limit switch connected in series to the coil and turned on by excitation of the time limit coil 23, and 18b is a second relay of the second relay coil 26 connected in parallel to the switch. This is switch B. In the third circuit 22, 28 is a second start switch that is turned on (by pressing), and 10d is a second start switch that is turned on (by excitation of the first relay coil 19).
The first relay switch D, l8c which is turned on is turned off by the excitation of the second relay coil 26), and the second relay switch C, which is turned off.
29 is the 31jth Ray coil. 15c is a third relay switch C connected in parallel to the second start switch 28.

The operation of the above device will be explained below.

First, in the changeover switch section 11, the first and second switches 11a and 11b are turned off, and the third switch 11c is turned on.

When the first start switch 17 is pressed and closed, the first relay coil 19 is energized and the first relay switch AlOa-
DlOd turns on. By turning on the first relay switch ClOc), the first relay coil 19 is in a self-holding state),
In addition, the pump motor 9 is driven as the first relay switches AlOa and BlOb are turned on. Therefore, Hotupa 14
The raw material 5 received at is pumped into the pipe 3. When it is determined that the raw material 5 has been sufficiently pumped to the pipe 3 in the heating chamber 1, the stop switch 16 is pressed to turn it off.
Then, the self-retention of the 111th coil 19 is released, and the pump 6 stops pumping the raw material 5. Next, in the changeover switch section 11, the first and second switches 11a, 11
After turning on the switch b and turning off the third switch 11c, the first start switch 17 is pressed and closed.

Then, the first relay coil 19 becomes in a self-holding state again), and the pump 6 resumes pressure feeding of the raw material 5. However, if a sufficient amount of raw Pt5 has not yet been pumped into the pipe 3 in the heating chamber 1, that is, if the load on the magnetron 2 is small, the pipe 3 in the pressure switch section 7
(The internal pressure becomes abnormally low), the low pressure switch 24 is turned on.

Then, the time limit coil 23 is energized, and after a few seconds, the time limit switch 27 is turned on, the second relay coil 26 is energized, the second relay switches Al8a and Cl8c are turned off, and the second relay switch B18b is turned on. The second relay coil 26 turns on the second relay switch Bl8b.
is in a self-holding state), and the second relay switch Al
8a), the self-retention of the first relay coil 19 is released and the pump 6 stops pumping the raw material 5. Therefore,
In the changeover switch section 11, the first and second switches 11A and llb are turned off again, and the third switch 11c is turned on. At this time, the self-holding of the second relay coil 26 is released and the second relay switch Al8a is turned on. Then, the first start switch 17 is turned on to further pump the raw material 5 to the pump 6. On the other hand, if the amount of load on the magnetron 2 is sufficient, the bias in the pressure switch section 7,
The pressure inside the coil 3 is normal, the low pressure switch 24 is off, and the second relay coil 26 is not energized.
The self-retention of the relay coil 19 is released and the pump 6 continues to pump the raw material 5.

Then, when the second start switch 28 is pressed and closed, the third
The relay coil 29 is energized, and the third relay switch Al
5a-Cl5c is turned on. Third relay switch Cl5
When C is turned on, the third relay coil 29 enters a self-holding state, and when the third relay switches Al5a and B15b are turned on, the DC high voltage circuit 12 is energized and microwave heating is started. Therefore, from the heating chamber 1, the raw material 5 that has been continuously heated and formed is extruded into products such as kamaboko and sausages. Then, when the stop switch 16 is pressed and turned off, the self-holding of the first relay coil 19 is released,
And since the self-holding of the third relay coil 29 is also released,
The power to the pump motor 9 and the DC high voltage circuit is removed,
Pressure feeding of raw materials and microphone mouth wave heating stop. However,
During the above operation, the amount of raw material 5 pumped into the pipe 3 in the heating chamber 1 may become abnormally small or become abnormally large due to clogging for some reason.

In this case, the pressure inside the pipe 3 in the pressure switch section 7 becomes abnormally low or high, the low pressure switch 24 or the high pressure switch 25 is turned on, and the time limit coil 23 is energized.
After a few seconds, the second relay coil 26 is energized and the second relay coil 26 is energized.
Relay switches Al8a and Cl8c are turned off. Then, the self-holding of the first and third relay coils 19 and 29 is released, the pump motor 9 and the DC high voltage circuit 12 are de-energized, and the pressure feeding and microwave heating of the raw material 5 are stopped. Yes, the pressure in the pressure switch section 7 may fluctuate instantaneously, but in response to such instantaneous fluctuations, the time limit coil 23 is not energized until the time limit switch 27 is turned on. Microwave heating does not stop.

As is clear from the above description, according to the present invention, by controlling the oscillation of the pressure feeding means and the magnetron based on the pressure inside the pipe, the amount of heated objects inside the pipe is abnormally reduced. Even if there is an abnormally large amount of heat, the magnetron, pipes, etc. will not be damaged and an extremely safe microwave heating molding device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of an apparatus according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of the same apparatus. 2...Magnetron, 3...Pipe, 6...Pressure pump, 24...Low pressure switch, 25...High pressure switch.

Claims (1)

[Claims] 1. A heating chamber, a pipe with small dielectric loss placed in the heating chamber, a pressure feeding means for pumping the object to be heated such as a viscous raw material into the pipe, and generation of microwaves to heat the object to be heated. A microwave heating molding apparatus comprising: a magnetron for detecting pressure in the pipe; and a detection means for detecting the pressure inside the pipe, and the driving of the pressure feeding means and the oscillation of the magnetron are controlled based on the operation of the means.