JP3195575B2 - Temperature control device for heating cylinder with heater with heat retention cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device for a heating cylinder having a heater with a heat insulating cover.

[0002]

2. Description of the Related Art In a heating cylinder of an injection molding machine, an extrusion molding machine, or the like, as shown in FIG.
In general, a type in which the band heater 102 attached to the outer wall surface of the heating unit 101 is heated to heat the heating cylinder 101 to a predetermined temperature by energizing the band heater 102 is used. There is a problem that a large amount of heat is radiated from the outer peripheral surface of the band heater 102, and energy is wasted correspondingly.

Therefore, as shown in FIG. 3, by attaching a heat insulating cover 203 having a heat insulating material 204 lined on the outer wall surface of a band heater 202 mounted on the outer wall surface of the heating cylinder 201, the amount of heat radiation from the band heater 202 is reduced. Heating cylinders having a heater with a heat retaining cover that has reduced heat generation have been developed.

[0004]

However, in the heating cylinder having the conventional heater with a heat retaining cover, the amount of heat radiated from the band heater during heating is reduced.
There are the following problems.

In an injection molding machine, an extrusion molding machine or the like, when the temperature of a heating cylinder becomes higher than a predetermined set temperature and needs to be cooled, the heat retaining effect by the heat retaining cover can be maintained even when the power supply to the band heater is stopped. As a hindrance, the temperature of the heating cylinder does not drop for a long time, during which the resin in the heating cylinder may be thermally degraded or the quality of the molded product may fluctuate.

Further, the band heater itself is exposed to a high temperature level for a long time, and the life of the heater is shortened.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and has a heat retaining cover that can reduce the amount of heat radiated from a heater and can rapidly lower the temperature of a heating cylinder. It is an object of the present invention to realize a temperature control device in a heating cylinder having a heater.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, a temperature control device for a heating cylinder having a heater with a heat retaining cover according to the present invention comprises: a heater mounted on an outer wall surface of the heating cylinder; in the heating cylinder having a heat insulating covered heater with a heat insulating cover attached to the wall, the thermal insulation cover, the semi-cylindrical pair of halves heat insulating material is lined with breathable
The heater is openably and closably connected by a hinge portion, and
Attached to the outer wall of each half and provided on the anti-hinge part side of each half
The bolts screwed into the boss
The two halves are communicated at the mating surface and the ventilation
A ventilation channel is formed by the heat insulating material having
The air supply port where the dust filter is
It is open and the dust collecting
An exhaust port provided with a filter is opened, and is configured to be able to forcibly cool by introducing outside air from the air supply port by the airflow generating means and exhausting the air from the exhaust port. Is what you do.

[0009]

[0010]

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

FIG. 1 is an explanatory diagram showing a temperature control device in a heating cylinder having a heater with a heat retaining cover according to one embodiment.

A heater 2 composed of a band heater or the like, which generates heat when energized, is attached to the outer wall surface of the heating cylinder 1, and a heat insulating material 5 made of glass wool or the like is lined on the outer wall surface of the heater 2. By attaching the cover 3, heat radiation from the outer wall surface of the heater 2 during heating can be reduced.

In the present embodiment, the heat retaining cover 3 is
Semi-cylindrical halves 3a and 3b, each of which is provided with a heat insulating material 5 having air permeability, are connected to be openable and closable by a hinge 6 so that each of the halves can be attached to the outer wall surface of the heater 2 when the heat insulating cover 3 is attached. When the tightening bolts 7 screwed to the bosses 4a, 4b provided on the side opposite to the hinges of the 3a, 3b are tightened, the two halves 3a, 3b are communicated with each other at the mating surface, and the heat insulating material 5 having air permeability is used. It is configured such that a ventilation path is formed.

An air supply port 8 provided with a dust filter 9 is provided on an outer wall surface of one half 3a, and a dust filter 11 and an exhaust gas filter are provided on an outer wall surface of the other half 3b. The exhaust port 10 provided with the fan 12 is provided.

For this reason, when the fan 12 is rotated to exhaust the air in the heat insulating cover 3, the outside air flows from the air inlet 8 through the arrow A.
As shown in (1), the air flows through the heat insulating material 5 having air permeability, is exhausted from the exhaust port 10 as shown by the arrow B, and the heating cylinder 1 is air-cooled together with the heater 2, so that the temperature of the heating cylinder 1 is rapidly increased. Can be lowered. In addition, the outside air sucked from the air supply port 8 is cleaned by the dust filter 9 and then flows into the heat retaining cover 3, where
Since the exhaust gas discharged to the outside is discharged through the dust collecting filter 11, the heat insulating material 5 and the like in the heat insulating cover 3 are not contaminated or the heat insulating material 5 and the like are not scattered to the outside.

In the temperature control device for a heating cylinder having a heater with a heat retaining cover shown in FIG. 1, when the heater 2 is energized (on), the heating cylinder 1 is heated and its temperature rises, and the fan 12 is rotated (on). Then, the heating cylinder 1 is air-cooled together with the heater 2 as described above, and the temperature is rapidly lowered. Therefore, by operating the heater 2 and the fan 12 as shown in Table 1, the temperature of the heating cylinder can be quickly controlled.

[0017]

[Table 1] Note that, in the present invention, the airflow generating means is not limited to the one in which the exhaust fan 10 is provided in the exhaust port 10 shown in FIG. 1, and a blower for sending outside air to the air supply port 8 may be provided. Alternatively, the fan 12 for exhaust may be provided at the exhaust port 10 and a blower for sending outside air to the air supply port 8 may be provided.

[0018]

Since the present invention is configured as described above, the following effects can be obtained.

[0019] In addition to the advantages of energy saving and shortening the time required to reach a set temperature during heating, the original heat retaining action of the heater with a heat retaining cover has been added.
Since the temperature of the heating cylinder can be rapidly lowered, the problem of the heating cylinder temperature becoming high for a long time and the resin being thermally degraded and the quality of the molded product fluctuating, as in the conventional example, is eliminated. Temperature control becomes possible. As a result, the temperature of the heating cylinder can be controlled with high accuracy, and the quality of the molded product can be improved.

In addition, since it can be cooled rapidly,
The heater itself is no longer exposed to high temperature levels for an extended period of time, extending the life of the heater. In addition
Outside air sucked from the air supply port
After cleaning, it flows into the thermal insulation cover, and
Exhaust exhausted to the section is discharged through a dust filter
Heat insulation material inside the heat insulation cover is contaminated or
Heating material does not scatter outside.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a temperature control device in a heating cylinder having a heater with a heat retaining cover according to an embodiment.

FIG. 2 is an explanatory diagram of a heating cylinder having a conventional heater.

FIG. 3 is an explanatory view of a heating cylinder having a conventional heater with a heat retaining cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating cylinder 2 Heater 3 Heat insulation cover 3a, 3b Half body 4a, 4b Boss part 5 Heat insulation material 6 Hinge part 7 Tightening bolt 8 Air supply port 9, 11 Dust collection filter 10 Exhaust port

Continuation of the front page (56) References JP-A 55-169095 (JP, U) JP-A 54-93068 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45 / 46-45/84 B29C 47/00-47/96

Claims (1)

(57) [Claims] 1. A heating cylinder having a heater (2) attached to an outer wall surface of a heating cylinder (1) and a heater with a heat insulating cover provided with a heat insulating cover (3) attached to an outer wall surface of the heater. A pair of half-cylindrical halves (3a, 3b) lined with a heat insulating material (5) having air permeability are provided on the heat insulating cover.
Opening (6) so as to be openable and closable,
On the anti-hinge side of each half
Bolts screwed to the set boss portions (4a, 4b)
By tightening (7), the two halves are in contact with each other.
And a ventilation path formed by the heat insulating material having air permeability.
Is formed on the outer wall of one half.
If the air supply port (8) in which the
In both cases, a dust filter (11) is provided on the outer wall of the other half.
An exhaust port (10) provided is opened, and is configured to be able to forcibly cool by introducing outside air from the air supply port and exhausting from the exhaust port by an airflow generating means (12). A temperature control device for a heating cylinder having a heater with a heat retaining cover.