JPH053299Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention relates to a temperature measuring device for a heating cylinder of an injection molding machine, and in particular, the thermocouple for temperature measurement can be adjusted to the optimum depth within the heating cylinder as needed. The present invention relates to a temperature measuring device that can be rotatably and fixedly installed in any position.

(Prior art) In an injection molding machine, the raw resin introduced into the heating cylinder is heated by a band heater installed on the outer periphery of the heating cylinder, and is sent to the front of the heating cylinder while being kneaded and melted by a screw inside the heating cylinder. It will be done.

Generally, in this type of heating cylinder, a thermocouple is arranged at a certain depth in the circumferential thickness direction of the cylinder, and the internal temperature in the front heater zone, middle heater zone, and rear heater zone of the cylinder is managed. Ru. However, the temperature of the heating cylinder varies depending on the position of the cooling fan and other external heat sources, internal heat generation due to material kneading, etc.; It is often not possible to handle delicate temperature measurements.

(Problem to be solved by the invention) Therefore, in view of the above situation, this invention proposes a heating cylinder temperature measuring device that can adjust the depth position of the thermocouple in the heating cylinder according to the molding process. It is something.

(Means for solving the problem) In other words, this invention has a blind hole for temperature measurement drilled from the outer surface of the heating cylinder toward the inner surface, and is configured to be rotatable and fixed at an appropriate depth position of the blind hole. A thermocouple for temperature measurement, which is formed as a protruding tip so that the tip comes into contact with the inner surface of the blind hole, is installed inside the holding tube. This relates to a temperature measuring device for a heating cylinder of an injection molding machine.

(Function) In this invention, a blind hole for temperature measurement is drilled from the outer surface of the heating cylinder toward the inner surface, and is configured to be rotatable and fixed at an appropriate depth position in the blind hole. A thermocouple having a protruding tip that contacts the inner surface of the blind hole is installed inside the holding cylinder. Therefore, the thermocouple can be rotated together with the holding cylinder to an appropriate depth position in the blind hole for measurement, and can be fixed therein.

(Example) Fig. 1 is a sectional view of an injection device equipped with a temperature measuring device for a heating cylinder according to this invention, Fig. 2 is an enlarged sectional view of the temperature measuring device, and Fig. 3 is a protruding tip of a thermocouple. FIG. 4 is a sectional view taken along line 4-4 in FIG. 3.

As shown in FIG. 1, the injection device S of this injection molding machine is a typical screw in-line type injection device, and 10 is a heating tube, 11 is a screw, and 12 is a nozzle. represent
Reference numerals 13, 13, . . . are band heaters arranged around the outer periphery of the heating cylinder, and reference numeral 14 is a temperature measuring device for the heating cylinder according to this invention, which is installed in each heater zone at the front, middle, and rear of the heating cylinder. Usually, one is provided at each zone to measure the temperature inside the heating cylinder in each zone.

FIG. 2 illustrates the configuration of this temperature measuring device 14. That is, the outer surface 1 of the heating cylinder 10
A blind hole 20 for temperature measurement is bored from 0A toward the inner surface 10B. Since this blind hole 20 is a place where the temperature of the heating cylinder is measured, in the embodiment, it is formed as deep as possible so as to reach near the cylinder inner surface 10B.

The blind hole 20 is provided on the outer surface of the heating cylinder above the blind hole 20.
Reference numeral 25 designates a support member attachment bottle to which a support member 23 having a through hole 24 communicating with is attached.

A holding cylinder 30 is inserted into the blind hole 20 and the through hole 24 of the support member 23, and a thermocouple 40 whose tip is bent into an L shape at right angles is housed inside the holding cylinder 30.

This holding cylinder 30 and thermocouple 40 are
As understood from FIGS. 3 and 4, the tip of the thermocouple is formed as a protruding tip 41 that protrudes from the side hole 31 of the holding cylinder 30 so as to come into contact with the inner surface of the blind measurement hole 20. Ru. The protruding tip 41 is fitted with a solder 3 in the hole 31 of the holding cylinder 30.
Fixed by 2. Furthermore, in this embodiment, the blind hole 20 of the tip portion 41 of the thermocouple is
In order to ensure reliable contact, leaf springs 33, 34, and 35 are provided on three sides around the tip 41 of the holding cylinder 30.

Reference numeral 36 denotes a leaf spring provided at the bottom of the holding cylinder 30 to absorb and reduce the impact with the floor 21 of the blind hole. As shown in FIG. 2, the thermocouple 40 housed in the holding tube 30 adjusts the depth of the protruding tip 41 in the blind measurement hole 20 by moving the holding tube 30 up and down in the direction of the arrow. Furthermore, by rotating the holding cylinder 30, it can be brought into contact with either side of the blind hole 20. The holding cylinder 30 is fixed by tightening a lock screw 26 inserted from the side of the support member 23. When the temperature of the heating cylinder is measured by the thermocouple 40 in the blind hole 20, the output of the thermocouple 40 is input to the temperature controller, passes through the contactor, and supplies power to each band heater 13.
ON and OFF are now controlled.

(Effects) As illustrated and explained above, in the temperature measuring device for the heating cylinder of an injection molding machine according to this invention, the depth of the thermocouple for temperature measurement with respect to the heating cylinder,
The position can be adjusted with a simple configuration, and it is now possible to set the optimum measurement position of the thermocouple depending on the molding.

Therefore, it was possible to provide a useful temperature measuring device that contributes to improving the quality of molded products, not to mention problems such as so-called "burning" caused by the temperature inside the heating cylinder.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an injection device equipped with a temperature measuring device for a heating cylinder according to this invention, FIG. 2 is an enlarged cross-sectional view of the temperature measuring device, and FIG. 3 is a front view of the protruding tip of the thermocouple. FIG. 4 is a sectional view taken along line 4-4 in FIG. 3. 10... Heating tube, 13... Band heater, 14
... Temperature measuring device, 20 ... Blind hole, 30 ... Holding cylinder, 40 ... Thermocouple, 41 ... Projection tip, S ... Injection device.

Claims (1)

[Claim for Utility Model Registration] A blind hole for temperature measurement is drilled from the outer surface of the heating cylinder toward the inner side, and a holding cylinder configured to be rotatable and fixed is inserted into the blind hole at an appropriate depth position. In addition, the heating cylinder of an injection molding machine is characterized in that a thermocouple for temperature measurement, which is formed as a protruding tip so that the tip comes into contact with the inner surface of the blind hole, is installed inside the holding cylinder. temperature measuring device.