JPS62231717A - Temperature control meter - Google Patents

Abstract

PURPOSE:To enable temperature control and prevention of superheating of a heater at a time, by a method wherein a device operating an electrification factor and displaying an operation result is provided on a temperature control meter performing temperature control of a heating cylinder of an injection molding machine. CONSTITUTION:As for an electrification state until the temperature arrives at a preset temperature Ts, when electrification time is Sn to fixed time t, though Sn/t is close to l and electrification is being performed to the extent of 100-80%, when the tempera ture arrives at the preset temperature Ts, now it is sufficient to maintain the tempera ture Ts as it is and the Sn/t becomes an extent of 0.5-0.6, that is, an electrification factor of 50-60%. Therefore, actual electrification time becomes S1+S2+S3+...+ Sn=SIGMASn within fixed time nt and an electrification factor becomes SIGMASn/ntX100% to operate the electrification factor. When the titled meter is so constituted that it raises alarm in the case where the electrification factor has been operated as mentioned above and a result of operation has exceeded a preset allowable electrification factor, it is unnecessary for a worker to monitor a temperature control meter every time, response is quick and superheating of a heating cylinder and damage of a heater caused by the superheating of the heater can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field to Which the Invention Pertains The present invention relates to a temperature controller that can display a current conduction rate that can prevent damage to a heating cylinder of an injection molding machine or the like due to the temperature side.

<Prior art and its drawbacks> Temperature controllers have traditionally been used to control the temperature of heating cylinders, etc., but recently, temperature controllers have recently been used to prevent damage to heaters due to overheating, to prevent overheating of heaters, etc. Multifunctional temperature controllers with prevention functions and the like are being developed.

Heater damage due to overheating can be prevented by detecting disconnection of the thermocouple, but if the thermocouple is not properly inserted into the temperature sensing point, it is not a disconnection and conventional heater damage prevention methods cannot detect it. As a result, the heater remained in an ON state until it was eventually turned off, making it impossible to prevent damage to the heater. In addition, to prevent overheating of the heating cylinder, etc., it was not possible to tell unless the machine operator saw whether the temperature controller needle had reached the set value and the ON-01i''F control was being performed.

<Object of the Invention> The present invention eliminates the above-mentioned drawbacks, and provides a temperature controller with a function to prevent damage caused by overheating of the heater related to temperature control of the heater, and overheating of the heating cylinder, etc. The purpose is to prevent heater overheating, etc. at the same time.

<Summary of the Invention> In order to achieve the above-mentioned object, a temperature control meter is provided, which is characterized by being provided with means for calculating the addition of an injection molding machine, etc., and displaying the calculation results. In addition, the thermometer is designed to issue an alarm when the calculation result exceeds a permissible energization rate value that can be set arbitrarily.

<Example> To explain the graph showing the relationship between the temporal temperature change state and the energization state using FIG. 1, the energization state until the temperature reaches the set temperature TS is the energization time Sn for a constant time t
Then, Sn/ is close to 1, and the current is about 100 to 80%, but when the temperature reaches the set temperature Ts,
This time, it is sufficient to maintain the temperature Ills, and /, is about 0.5 to 0.6, that is, 50 to
This shows that the '1ltI rate is 60chi.

Therefore, in order to calculate the west electric rate, it is necessary to
The actual declaration is S, 10 out of 181 +...+81
=ΣSn, and the ΣSn conduction rate is -, knee X100%.

<Effect> The energization rate is calculated as described above, and if the calculation result exceeds the predetermined allowable energization rate, an alarm is issued, eliminating the need for the operator to monitor the temperature controller each time. Moreover, compared to conventional devices, the response is faster, preventing overheating of the heating cylinder, etc., and preventing damage to the heater due to overheating. In addition, it is possible to control the heat capacity received from the heating cylinder, which allows different materials to have different properties.

[Brief explanation of drawings]

FIG. 1 is a graph showing the passage of time, temperature changes, and current application time in the present invention.

Claims (1)

[Scope of Claims] 1. A temperature controller that controls the temperature of a heating cylinder of an injection molding machine, etc., which is equipped with a means for calculating an energization rate and displaying the result of the calculation. 2. The temperature controller according to claim 1, wherein an alarm is issued when the calculation result exceeds an arbitrarily set energization rate.