JP2796447B2 - Method and apparatus for discriminating molded articles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution system for injection molding machines, a die casting machine, a hot forging machine, a method for discriminating molded products applicable to a distribution system for transporting various kinds of articles after heating in a food machine or the like. And an apparatus.

[0002]

2. Description of the Related Art Articles taken out of a plurality of thermoforming machines, for example, an injection molding machine, are placed on a conveyor such as a single conveyor for the sake of cost and space, and then flowed downstream. Conventionally, when automatically separating and packing in a box or flowing to the next process, a shape recognition device or a discrimination device based on weight has conventionally been used.

[0003]

The conventional shape recognition device has a drawback that it cannot distinguish a similar shape, and a drawer based on weight cannot distinguish a same weight. In a system that separates articles taken out from a plurality of thermoforming machines by using a single conveyor and then separates them for each article, it is possible to discriminate similar-shaped articles and to discriminate articles of the same weight. Requires that a simple discriminator be incorporated into the system. The present invention has been proposed to solve the above-mentioned conventional problems.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method of discriminating molded articles which are conveyed in a mixed manner and ejected from a plurality of heat molding machines and discriminated by the discriminating means. In the method, the surface temperature of a molded product is detected to determine each molded product, and this is used as a means for solving the problem.

Further, according to the present invention, there is provided a molded article discriminating apparatus in which respective molded articles taken out from a plurality of heat molding machines are conveyed in a mixed state and discriminated into respective molded articles by a discriminating means. A temperature detector for detecting the surface temperature of the molded article, a setting section for setting the surface temperature of the molded article in the temperature detecting section, a correction circuit for correcting the surface temperature from the setting section from the ambient temperature to a discrimination temperature, A means for discriminating each molded article by comparing the detected temperature from a temperature detector with the discrimination temperature and outputting a molded article discrimination signal, and means for solving this problem. It is assumed that.

[0006]

[Function] When an article taken out of a thermoforming machine is placed on a conveyor such as a conveyor and flows downstream,
The temperature of the item decreases over time along the cooling curve. If the transport speed is constant, the relationship between the transport distance and the temperature of the article is also constant. By the way, if the material, the shape, and the removal temperature of the articles are the same, the temperature of each article decreases along the same cooling curve as the transport distance increases as shown in FIG. As for the temperature of the product at the temperature measurement position 5, the temperature 7 of the product taken out at the take-out position 3 on the upstream side from the position 5 is the temperature 6 of the product taken out at the take-out position 4 downstream of the position 3. Lower. Some cooling curves differ depending on the material and shape of the product and the temperature at which the product is taken out.
As shown in the cooling curve 8 and the cooling curve 9 in FIG.
In some cases, the temperature on the upstream side and the temperature on the downstream side may be the same. The temperature difference is made at the temperature measurement position by slightly lowering the temperature as shown in FIG. In this manner, a temperature measuring device such as a radiation thermometer is placed at the temperature measuring position of the transport device, and the inherent temperature of each item is measured and stored in advance, and each item can be discriminated. Note that FIG.
3 and 3, the vertical axis represents the surface temperature of the article, and the horizontal axis represents the transport distance.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of the present invention, in which each of a plurality of injection molding machines 11, 12, 13, and 14 is individually molded by an automatic unloading machine 15. After being taken out and placed at the take-out positions 1, 2, 3, and 4 of the conveyor 16, they are conveyed downstream and separated by the sorting device 17 into boxes 31 and 3 for each molded product.
2,33,34. A radiation thermometer 18 for temperature measurement is provided at a temperature measurement position 5 in front of the separation device 17.
The radiation thermometer 18 is installed so that the molded article on the conveyor 16 can enter the field of view.
Send the measurement results to The temperature discrimination device 25 compares the measured value of the radiation thermometer 18 with the temperature set for each molded product to determine from which molding machine the molded product has been taken out.
The sorting device 17 includes a diverter 19 and a branch conveyor 20 provided on the conveyor 16, and the diverter 19 changes the direction of the molded article to the branch conveyor 20 according to a command from the temperature discriminator 25. .

[0008] The molded products 21, 22, 23, 24 are taken out of the injection molding machines 11, 12, 13, 14 by an automatic take-out machine 15, placed at take-out positions 1, 2, 3, 4 of a conveyor 16 and downstream. Conveyed. For example, at the temperature measurement position 5, the temperature of the molded article 21 is 50 ° C., and the temperature of the molded article 22 is 5 ° C.
When the temperature of the molded article 23 is 58 ° C., the temperature of the molded article 24 is 62 ° C., the temperature identification device 25 is set in advance, and when the measured value of the radiation thermometer 18 is 50 ° C., the injection molding machine is used. 1
Judging that it is the first molded article 21, the direction changer 19a operates,
When the measured value is 54 ° C., it is determined as the molded product 22 of the injection molding machine 12 and the direction changer 19b is operated, and when the measured value is 58 ° C., it is determined as the molded product 23 of the injection molding machine 13 and the direction is changed. The molded article temperature setting section is set so that the machine 19c operates.

At the temperature measuring position 5 in the middle of the conveyor 16, the temperatures of the molded products 21, 22, 23, and 24 are measured by the radiation thermometer 18, and when the radiation thermometer 18 measures 50 ° C. The direction changing machine 19a operates to drop the molded article 21 into the box 31. The radiation thermometer 18 is 58
When the temperature is measured, the direction changer 19c operates and the molded product 23 falls into the box 33. When the radiation thermometer 18 measures 62 ° C., the molded product 24 proceeds without turning, and falls into the box 34. When the temperature of the molded article 23 becomes 62 ° C. at the temperature measurement position 5 and becomes the same as the temperature of the molded article 24 of 62 ° C., it is impossible to determine the temperature based on the temperature. By changing the cooling time to be longer, the temperature of the molded product 23 at the temperature measurement position 5 can be made lower than 62 ° C. at the temperature measurement position 5 by slightly lowering the take-out temperature, so that a temperature difference can be given and discriminated.

Since the measured temperature value changes due to a change in the room temperature, the set value is automatically corrected in accordance with the change in the room temperature by using the indoor air temperature sensor and the set temperature correction circuit 27, and the product is correctly identified. I can do it. For example, when the temperature of the molded article 21 at room temperature 15 ° C. at the temperature measurement position 5 is 50 ° C. and becomes 53 ° C. at room temperature 20 ° C., the set temperature correction circuit 27 automatically sets the discrimination temperature of the molded article 21 to 53 ° C. Correction.

[0011]

As described above in detail, according to the present invention, when an article flows from a plurality of heating machines by a transfer device, the temperature is measured at an intermediate temperature measurement position, and the result is set in advance. By comparing and judging with the set temperature, it can be judged by judging from which processing machine the article comes out. Further, by measuring the temperature of an article having a similar shape and an article having the same weight, each molded article can be identified by a simple and inexpensive system.

[Brief description of the drawings]

FIG. 1 is a system diagram of a molded article discriminating apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a first example of a relationship between a transport distance and a temperature.

FIG. 3 is an explanatory diagram showing a second example of the relationship between the transport distance and the temperature.

FIG. 4 is a block diagram illustrating control of a system according to the present invention.

[Explanation of symbols]

 11, 12, 13, 14 Injection molding machine 15 Automatic take-out machine 16 Conveyor 17 Separation device 18 Radiation thermometer 19 Direction changer 20 Branch conveyor 21, 22, 23, 24 Molded product 25 Temperature identification device

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B07C 1/00-9/00 B65G 47/34-47/51

Claims (2)

(57) [Claims] 1. A molded article discriminating method in which respective molded articles taken out from a plurality of heating molding machines are conveyed in a mixed manner and discriminated into respective molded articles by a discriminating means, wherein a surface temperature of the molded article is detected. And a method for determining a molded article, wherein the method is for distinguishing each molded article. 2. A molded article discriminating apparatus in which respective molded articles taken out from a plurality of heat molding machines are conveyed in a mixed manner and are discriminated into respective molded articles by a discriminating means. A temperature detector for detecting the surface temperature, a setting unit for setting the surface temperature of the molded article in the temperature detection unit, a correction circuit for correcting the surface temperature from the setting unit from the ambient temperature to a discrimination temperature, and the temperature detector A discriminating unit for discriminating each molded article by comparing the detected temperature from the discrimination temperature with the discrimination temperature and outputting a molded article discrimination signal.