JPS6094130A - Automatic controller for amount of supply - Google Patents

Abstract

PURPOSE:To discharge precisely the optimum amt. of a hardener in correspondence with the temp. by providing a temp. detecting means, a datum input means, a control signal generating means, and a frequency converter. CONSTITUTION:The value detected by a temp. detector 11 is converted by a signal converter 12 into a digital signal from the analog value, and sent through an input board 13 to an arithmetic part 14 consisting of an electronic circuit. A means for detecting the temp. in a silo and generating a temp. signal corresponds to the temp. detector 11 and the signal converter 12. The data are inputted from the input board 13, and the output signal from the arithmetic part 14 is converted by a signal converter 15 from a digital signal into an analog signal for controlling a frequency converter which controls a frequency converter 16 as a control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that automatically controls the supply amount of reaction reagents, etc., and more specifically, the present invention relates to a device that automatically controls the supply amount of reaction reagents, etc. This invention relates to a control device 1'1 that is capable of controlling the supply amount manually (II).

Now 1, ・Generally speaking, chemical reactions are chemical, 1, which was refined in ``Chemistry''! - (Device 6 made '6' J!l! using a bill
1. It is carried out under temperature conditions. Therefore, it is rare that defects occur due to variations in reaction conditions, etc. However, in some chemical experiments, there are cases where the process is performed while being exposed to the outside air,
There are cases in which substances such as raw materials and various additives undergo thermal history close to the time of reaction. In such cases, temperature conditions are not well controlled and various controls are required to obtain consistent results.

An example of this is a step in which molding sand is hardened with a hardening agent to form a mold in the casting manufacturing process.

In other words, in the process of manufacturing molds, foundry sand stored in a silo is put into a mixer together with a binder.
Stir in a mixer. Then, a hardening agent is added thereto, stirred, and molded to harden the foundry sand. Molten metal is poured into a mold made of hardened foundry sand to produce a casting. The molds used to make the castings are then destroyed and the sand is recycled and stored in the silo again. Here, since the recycled sand has undergone a thermal history, the temperature of the foundry sand will vary over a wide range during the process of adding a binder to the foundry sand and then adding a hardening agent to make the mold. . -Day driving B1
Even within 1lj1, the sand temperature is low when starting in the morning, but becomes considerably high when the recycled sand comes around, and even throughout the year, there is a big difference in sand temperature between summer and winter. There is. Such variations in sand temperature result in uncured binder, uncontrollable pot life (reaction time), and excessive use of curing agent.
Currently, settings for hardening agent added stitching are done manually one by one. However, since precise control is impossible even by hand, in order to avoid accidents caused by uncured pinters, there are rules for using too much hardening agent.
Precise control of the time of envoy t111 is not very strict. Therefore, the current situation is that incompatibility such as impurity//f due to excessive use of curing agent is left unaddressed.

Therefore, the inventors of the present invention have conducted extensive research in view of these problems and have thus obtained the present invention.

That is, the present invention provides (a) means for detecting the temperature in the silo and generating a temperature signal; (b) basic data such as the type of additive, amount added, and reaction time, and the relationship between these data and temperature. (c) Calculates the appropriate rotational speed of the motor that drives the pump that discharges the additive from the temperature signal from (a) and the input data from (b); and means for generating a control signal; (d) a frequency converter controlled by the control signal of (c); (e) rotating at a speed calculated by (c) according to the frequency converted by the frequency converter of (d); The present invention provides an automatic supply amount control device comprising a motor that drives a pump that discharges the additive.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, a foundry sand mixing mixer 1, which is an example to which the present invention is preferably applied, has a silo 3.0 which stores foundry sand 2. and a mixer 4 to which the foundry sand 2 is supplied together with a pinter. This control device automatically adds a curing agent 6 stored in a container 5 as an additive to the mixer 4 via a pump 8 equipped with a motor 7, and these are stirred in the mixer 4. Thereafter, the process proceeds from the outlet 9 to the mold filling process.

The control device 10 according to the present invention first includes a temperature detector 11 that detects the temperature of the foundry sand in the silo. The value detected by this temperature detector 11 is converted from an analog value to a digital signal 1'f by a Shinsou converter 2, and is sent via an input port 13 to an arithmetic unit 14 composed of an electric r control circuit. Sent. In this example, the above (a)
That is, the means for detecting the temperature in the silo and generating a temperature signal correspond to the temperature detector 11 and the transducer 12. (b) The input means for inputting basic data such as the type of additive, amount of addition, reaction time, etc., and data on the correlation between these data and temperature is configured as input port I/13 in jl. has been done. The calculation unit 14 is
(C) above, that is, means for calculating an appropriate rotational speed of a motor that drives a pump that discharges the additive based on the warm melon information in (a) and the input data in (h), and generating a control signal. ing. The output value from the calculation unit 14 is converted from a digital signal to an analog signal (i, ffi) for frequency converter control by the i, i converter 15, and is used as a control signal to control the frequency converter 16. is+ii
The motor 7 is connected to the motor 7 that drives the J pump 8, and the motor 7 rotates at a speed calculated by the calculation unit according to the frequency converted by the frequency converter 16, and supplies the curing agent to the mixer 4. Perform discharge.

FIG. 2 shows the configuration of the calculation section 14 and the calculation section and others shown in FIG. 1 in more detail.

In this embodiment, the calculation unit 14 is constituted by a well-known microprocessor sensor, and its basic configuration is
7, RAM18, ROM+9. (Impun, Topo) 13 includes basic data such as the type of paint and curing agent used, the relationship between the addition of the curing agent and reaction time, and data on the correlation between these data and temperature. . Further, temperature data detected by the temperature detector 11 and converted from an analog value to a digital signal by the signal converter 12 is also input to the implant port 13 . The CPU 17 accesses RArvxia and data according to the program written in the ROM 19, and calculates an appropriate rotational speed of the motor 7 of the pump 8 from these data so as to add the curing agent most preferably. , output port this. As mentioned above, the output value from the 6if j') section 14 is converted from a digital signal to an analog signal for controlling the frequency converter by the signal converter 15, and is used as a control signal to control the frequency converter 16. As a result, the pump will eventually discharge the curing agent at the optimum irl based on the current temperature.

Thus, in the embodiments described above, it is difficult to accurately discharge an optimum amount of hardening agent depending on the temperature of the foundry sand.
Becomes Noh. This makes it possible to avoid excessive use of curing agent, which is economical, and also makes it possible to keep the reaction time constant. Furthermore, by mobilizing the system, labor can be saved, which has extremely useful practical effects.

Although one embodiment of the present invention has been described below, the present invention is not limited to castings, and can of course be used to control other chemicals for other purposes. .

[Brief explanation of the drawing]

FIG. 1 is a professional diagram showing an embodiment of the present invention;
FIG. 2 is a block diagram showing a part of FIG. 1 enlarged. 1... M sand mixing mixer 2... Foundry sand 3...
Silo 4... Mixer 5... Container 6... Curing agent 7... Motor 8 Pump 9... Outlet 10.
...Control device 11...Temperature detector 12...Signal converter 13...Input port 14...Arithmetic unit
, 15...Signal converter 16...Frequency converter/<-tar 17...CPU 18...RAM 1G...RO
M20...Output port applicant's agent Kaoru Furuya

Claims (1)

[Claims] (a) Means for detecting the temperature in the silo and generating a temperature signal; (b) Basic data such as the type of additive, the amount added, and the reaction time, and the correlation between these data and temperature. Input the data etc. an input means, (c) calculating an appropriate rotational speed of a motor that drives a pump that discharges the additive from the temperature signal according to (a) and the input data according to (b);
means for generating a control signal; (d) a frequency converter controlled by the control signal of (c); (e) rotating at a speed calculated by (C) according to the frequency converted by the frequency converter of (d); An automatic feed rate control device consisting of a motor that drives a pump that discharges additives.