JPH0616461Y2 - Electric heater device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention rotatably transfers an object to be heated by a turret, such as a preform crystallization device or a blow molding device provided in a PET (polyethylene terephthalate) container manufacturing line. However, the present invention relates to an electric heater device suitable for heating from the surroundings.

[Prior Art] For example, in the case of blow molding a PET preform, as shown in FIG. 5, a plurality of heaters 100 for local heating are provided around a turret 11 for preform transfer over a certain range. The preform (object to be heated) W arranged and attached to the mandrel attached to the turret 11 is heated from the surroundings.

Here, in the conventional heater device, as shown in an enlarged view in FIG. 6, a heating element 102 is housed in a linear elongated case 101, and lead portions formed at both ends of the heating element 102 (see FIG. A lead wire 103 is connected to each of the (not shown), and the lead wire 103 is drawn from both ends of the case 101 and connected to a power supply (not shown).

[Problems to be Solved] In the above-described conventional heater device, when the heater device is arranged around the turret 11, the distance between the circular transfer track 13 by the turret 11 and the heater 100 is different in each part as shown in FIG. become. Therefore, for example, the heater 10
In the central part of 0, the distance D ₁ to the heated object W becomes short,
Although the heating amount for the object W to be heated becomes large, the heater 10
At the end of 0, the distance D ₂ to the heated object W becomes long,
The heating amount for the object W to be heated becomes small. As a result, the heating of the object W to be heated becomes non-uniform, and the quality of the product may be deteriorated.

Further, since the conventional heater device has a configuration in which the lead portion and the lead wire 103 are drawn out to both sides of the case 101, a plurality of case 101 is provided around the turret 11.
In the case of installing the heater, a certain space must be provided so that the lead portions of the adjacent heater and the lead wire 103 do not interfere with each other, and there is a drawback that the installation space becomes large.

Even if the distance between the heaters 100 is increased as described above, the non-heated zone is formed in the area of the distance.
It has a drawback that heating of the object W to be heated becomes non-uniform intermittent heating.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and provides a heater capable of uniformly heating the object to be heated supplied to the turret and saving the installation space. To aim.

[Means for Solving the Problems] In order to achieve the above object, an electric heater device of the present invention has an elongated case that is curved with a required curvature and is bent at both ends, and the inside of the case is end to end. A heater having an electric heating element that penetrates through the main heating element and that has a main heating portion arranged over the entire length of the curved portion, and lead wires that are connected to both ends of the electric heating element at both ends of the case. A groove formed of metal is provided, and the inside of the groove is a support table in which the heater is attached in a state of being floated from the bottom of the groove via a holder made of a thin plate material.

Here, the curvature of the case corresponds to the curvature of the turret as the installation destination.

[Operation] According to the electric heater device as described above, since the case has the curved shape corresponding to the curvature of the turret, the distance between the case and the turret is constant, and uniform heating can be performed.

Also, both ends of the case are bent, the main heat generating part is housed in the curved part of the case, and the lead part is housed in the bent part of the case. Individual heaters can be installed in close proximity.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention. FIG. 1 is a plan view of a heater, FIG. 2 is a partially cutaway plan view showing an enlarged end portion of the heater, and FIG. Is a plan view showing a state of installation around the turret, and FIG. 4 is a front view showing a part of a support base in the electric heater device.

The electric heater device of the present invention comprises a heater 10 and a support 20.

In FIGS. 1 and 2, 1 is a case of the heater 10,
A heating element 2 is provided inside the case 1, and lead wires 3 respectively connected to both ends of the heating element 2 are drawn out from both ends of the case 1.

The case 1 is made of a long glass tube having a hollow portion 1a and is formed in a curved shape with a predetermined curvature. The curvature is set corresponding to the curvature of the turret. Specifically, as shown in FIG. 3, the turret 11
When arranging the electric heater device on the circumference 12 concentric with
The case 1 is curved with the same curvature as the circumference 12.

Further, both ends 1b of the case 1 are formed by being bent outward at substantially right angles, and lead terminals 4 made of molybdenum or the like are provided on the bent ends 1b.

The heating element 2 is made of a wire material such as a nichrome (nickel chrome alloy) wire, and is composed of a main heating portion 2a and a lead portion 2b that generates a small amount of heat. Main heat generating part 2a is case 1
Is installed in the hollow portion 1a over the entire length of the curved portion (that is, the portion facing the object to be heated). Further, the lead portions 2b connect between both ends of the main heat generating portion 2a and the lead terminals 4, respectively.

Reference numeral 5 is a support for holding such an installed state of the heating element 2, which is provided between the inner wall of the case 1 and the heating element 2 at an arbitrary interval.

The lead wires 3 are connected to both ends of the heating element 2 via lead terminals 4 provided at both ends of the case 1.
Specifically, the lead wire 3 and the lead portion 2b of the heating element 2 are connected via the joint portion 4 of the lead terminal 4. The other end of the lead wire 3 is connected to a power source (not shown).

As shown in FIG. 3, a plurality of heaters 10 having the above-described structure are arranged in series on the outer circumference of the turret 11.
In order to realize such an installation, in this embodiment, the support base 20 as shown in FIG. 4 is used. A groove 21 is formed on the support base 20 in the front circumferential direction, and the heater 10 is attached to the groove 20 via a holder 22. The holder 22 is formed of a thin plate material, and is fixed to the support base 20 while floating from the bottom of the groove 21. This prevents heat from the heater 10 from being transferred to the support base 20 via the holder 22. The surface of the groove 21 for mounting the heater 10 is made of a metal having a high heat reflectance. This prevents the heat generated from the heater 10 from being conducted to the support base 20.

As described above, in the heater of the present embodiment, the case 10 has the curved shape corresponding to the curvature of the turret 11, so that the distance between the case 10 and the turret 11 is constant, and uniform heating can be performed. Further, since both ends of the case 10 are bent substantially at right angles and the lead wires 3 are drawn out from these both ends, it is possible to continuously install a plurality of heaters 10 in close proximity. As a result, the quality of the product manufactured by heating can be improved, and the heating system can be made compact to save the installation space and facilitate the design.

Further, the support table 20 is configured as described above, and the heater 10
By preventing heat conduction from the support base 20 to the support base 20, heating can be performed efficiently without loss of heat and the support base 2
It is possible to prevent various dangers and harmful effects caused by heating at 0.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the invention.

For example, in addition to blow molding of containers, it can be applied to a crystallization system of the bottom or mouth of a preform, a local heating system of plastic parts, and an end surface heating system of plastic pipes.

Further, the same effect can be obtained even if the rotary transfer mechanism other than the turret (for example, a pulley of a belt conveyor) is installed around the rotary transfer mechanism.

Further, it can be installed on the inner peripheral surface side of the rotary transfer mechanism. In this case, both ends of the case may be bent inward.

[Advantages of the Invention] As described above, according to the heater of the present invention, the object to be heated supplied to the turret can be uniformly heated and the installation space can be saved.

Further, by preventing the heat generated from the heater from being conducted to the support base, the heating efficiency is improved and the danger due to the high heat of the support base is prevented.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a plan view of a heater, FIG. 2 is a partially cutaway plan view showing an enlarged end portion of the heater, and FIG. Is a plan view showing a state of installation around the turret, FIG. 4 is a front view showing a part of a support base of an electric heater device, FIG. 5 is a schematic plan view showing a conventional preform blow molding system, and FIG. The figure is a plan view showing a conventional heater. 1: Case 2: Heating element 2a: Heating part 2b: Lead part 3: Lead wire 4: Lead terminal 4a: Joining part 10: Heater 11: Turret 20: Support base

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display area B29K 67:00 4F

Claims (1)

[Scope of utility model registration request] Claims: 1. An elongated case which is curved with a required curvature and is bent at both ends, and an electric heating device which penetrates through the case from one end to the other and has a main heating portion arranged over the entire length of the curved portion. A heater having a body and lead wires respectively connected to both ends of the electric heating element at both ends of the case; a groove having a surface formed of a metal having high heat reflectance is provided, and the heater is provided inside the groove. An electric heater device comprising a holder made of a thin plate member and a support table mounted in a state of floating from the bottom of the groove.