Heating device
阅读说明:本技术 加热装置 (Heating device ) 是由 S·席尔 于 2019-04-11 设计创作,主要内容包括:本发明涉及一种加热装置,其包括:炉,待加热的半成品可以被移入到该炉中并且从该炉中移出;导线支座,该导线支座由多个彼此间隔开距离的导线构成并且半成品能够被定位在该导线支座上;以及用于使导线支座移入到炉中并且从炉中移出的机构。为了能够实现高移动速度的移动并且同时能够将同一个导线支座用于不同成形的半成品,按照本发明规定,导线是导电的并且所选出的导线可以被加载电压并且由此被加热,其中,该电压可以这样被设定和/或调节,使得导线可以占据可预先给定的温度。通过对导线适当地加热,半成品能够通过熔化固定在导线支座上。(The invention relates to a heating device, comprising: a furnace into which the semifinished product to be heated can be moved and from which it can be removed; a conductor support which is formed from a plurality of conductors at a distance from one another and on which the semifinished product can be positioned; and a mechanism for moving the wire support into and out of the furnace. In order to be able to move at high displacement speeds and at the same time be able to use the same wire carrier for differently shaped semifinished products, it is provided according to the invention that the wires are electrically conductive and that selected wires can be subjected to a voltage and thus heated, wherein the voltage can be set and/or adjusted in such a way that the wires can assume a predeterminable temperature. By suitably heating the wire, the semi-finished product can be fixed on the wire holder by melting.)
1. A heating device, comprising: a furnace (21) into which the semifinished product (9) to be heated can be moved and from which it can be removed; a conductor support (30) which is formed from a plurality of conductors (32, 32a, 32b) at a distance from one another and on which the semi-finished product (9) can be positioned; and a mechanism (22) for moving the wire carrier (30) into and out of the furnace (21), characterized in that the wires (32, 32a, 32b) are electrically conductive and the selected wire (32, 32a, 32b) can be subjected to a voltage and thereby heated, wherein the voltage can be set and/or adjusted in such a way that the wire (32, 32a, 32b) can assume a predeterminable temperature or the switch-on duration of the power supply is predetermined.
2. The heating device according to claim 1, characterized in that the wire holder (30) is composed of a plurality of wires (32) parallel to each other.
3. The heating device according to claim 1 or 2, wherein the wire holder is formed by a plurality of crossing wires (32a, 32b), wherein the wires (32a, 32b) preferably cross at an angle of 90 °.
4. Heating device according to any one of the preceding claims, characterized in that a temperature sensor (36) is provided on one or more of the wires (32, 32a, 32b), respectively.
5. Heating device according to one of the preceding claims, characterized in that for moving the wire support (30) a carriage (25) is provided which can be moved into the furnace (21) and out of the furnace on a rail system (23, 24).
6. Heating device according to one of the preceding claims, characterized in that an adjusting device (37) is provided, with which the voltage can be set and/or adjusted such that the line (32, 32a, 32b) can be kept at a predeterminable temperature.
7. Injection molding machine (1) for producing plastic molded parts from a semifinished product (9) which is injection-molded with a plastic material, comprising a closing unit, an injection unit, a robot and a heating device according to one of claims 1 to 6.
8. Method for producing a plastic molded part from a semifinished product, which is encapsulated with a plastic material by injection molding, wherein the semifinished product is heated by means of a heating device according to any one of claims 1 to 6, wherein the voltage of the line is set to a value at which the line has a temperature which causes the semifinished product to melt, wherein the heated semifinished product is removed from the line carrier after removal of the line carrier from the furnace and is encapsulated with the plastic material in an injection molding machine.
Technical Field
The invention relates to a heating device according to the preamble of claim 1, to an injection molding installation equipped with such a heating device, and to a method for producing plastic molded parts from semifinished products encapsulated by injection molding with a plastic material.
Background
A generic heating device is known from DE102014010173a 1. The heating device is usually used in an injection molding machine for producing plastic molded parts made of semifinished products that are injection-molded with a plastic material. The heating device known from DE102014010173a1 has a carriage system, by means of which a frame can be moved through a heating zone formed by a heat radiator.
According to a first embodiment (DE102014010173a1, fig. 4), a clamping frame is provided, which has a plurality of spring-loaded holding devices in the form of clips. The semi-finished product is held in its position by means of a clip. The clamp is spring-loaded in order to compensate for thermal deformations of the semi-finished product and thermal expansions of the clamping frame. According to a second embodiment (DE102014010173a1, fig. 5), the conductor holder, which is formed by a plurality of conductors, is clamped in a frame, wherein the conductors are spring-loaded to compensate for thermal deformations. In this case, the semifinished product is merely placed on the conductor support.
In principle, it is considered to be advantageous to avoid the semifinished product from slipping off during the movement of the wire support. In the exemplary embodiment according to DE102014010173a1, the semifinished product is only placed on the wire holder, so that only low displacement speeds can be set. The difference is the case in the embodiment of fig. 4 in DE102014010173a1, in which spring-loaded clips are used as positioning aids and for holding the semifinished product. A higher displacement speed can also be provided with this embodiment. However, it is disadvantageous that these positioning aids must be adapted individually for differently configured semi-finished products. If such a positioning aid is made of a metallic material, it will heat up, which in itself brings about some disadvantages. On the one hand, this can lead to a change in the position of the semifinished product in the furnace and, on the other hand, the heating behavior of the semifinished product can be adversely affected by the thermal capacity of the positioning aid.
Disclosure of Invention
Starting from this, the object of the invention is to provide a heating device which can be used for differently shaped semifinished products without having to adapt the wire support.
This object is achieved by a heating device having the features of claim 1. Advantageous embodiments and further developments are obtained in the dependent claims.
By the following means: the wires of the wire carrier are electrically conductive and selected wires can be subjected to a voltage and thus heated, wherein the voltage can be set and/or adjusted in such a way that the wires can assume a predeterminable temperature and the surface of the semifinished product can be heated to above the melting temperature of the semifinished substrate. This results in the semi-finished product adhering to the conductor support, whereby the positioning aid is superfluous. No longer leaves the position that it occupied once when the semi-finished product was placed on the wire holder. The semi-finished product is reliably held in its position on the conductor support even at relatively high displacement speeds.
Another advantage is that the same wire holder can be used for differently shaped semi-finished products, as long as the semi-finished product is smaller than the available bearing surface of the wire holder. Thus, the same wire support can be used for different profiles of the semi-finished product. Unlike the prior art, the conductor support does not need to be matched when the semi-finished product is replaced. Since there is no positioning aid, the disadvantages associated therewith, as described above, are not taken into account.
According to a first embodiment, the conductor support can be formed from a plurality of conductors which are parallel to one another. Furthermore, the conductor support can be formed from a plurality of intersecting conductors, wherein the conductors preferably intersect at an angle of 90 °. Suitable insulation may be provided at the intersection.
Preferably, a temperature sensor is provided on one or more of the lines in order to measure the temperature of the line and to be able to set a temperature suitable for the semifinished product.
In a further development of the invention, a carriage can be provided for moving the wire support, which carriage can be moved into and out of the furnace on a rail system. The furnace and carriage system can be designed in the same way as in DE102014010173a1, i.e. the rail system extends through the furnace, so that the carriage can be moved into the furnace on one side and out of the furnace on the opposite side by means of the wire carrier. The furnace and carriage system may also be configured such that the carriage, with the wire support, can be moved into and out of the furnace on the same side of the furnace.
Furthermore, a regulating device can be provided, by means of which the voltage can be set and/or regulated in such a way that the line can be kept at a predeterminable temperature. External influences which may lead to temperature fluctuations can thus be compensated for.
A preferred field of application of the heating device according to the invention is an apparatus for producing plastic molded parts from semifinished products that are injection-molded with a plastic material. The apparatus comprises an injection molding machine known per se with a closing unit and an injection unit, a robot and a heating device according to the invention.
The invention further relates to a method for producing a plastic molded part from a semifinished product injection-molded with a plastic material, wherein the semifinished product is heated by means of a heating device according to the invention, wherein the voltage of the line is set to a value at which the line has a temperature that causes the semifinished product to melt, wherein the heated semifinished product is removed from the line carrier after the line carrier has been removed from the furnace and is injection-molded with the plastic material in an injection-molding machine. For handling the semifinished product, robots known per se can be used.
Preferably, measures can be taken to set the temperature of the wire in a suitable manner, namely:
-pre-heating the wire to a temperature above the melting temperature of the semi-finished product. For the polyamide semi-finished product, for example, 260 ℃.
In this case, the temperature of the wire grid is regulated by at least one thermocouple, a thermocouple being fastened to a wire or a plurality of thermocouples being fastened to a wire in each case. Preferably, thermocouples with small dimensions can be used for this purpose in order to keep the thermal mass as low as possible.
Together with a suitable switching element, such as a Solid State Relay (SSR), the temperature rise of the wire can now be regulated by the duration of the applied voltage, wherein the temperature is measured with a thermocouple. It is likewise conceivable to adapt the voltage or current intensity accordingly instead of the switch-on duration.
Temperature regulation by means of the switch-on duration is known and is known, for example, from ceramic heating bands or infrared temperature regulation.
At the moment of placing the semifinished product on the grate, there is therefore a wire support, the temperature of which has been adjusted above the melting temperature.
By contact between the semifinished product and the conductor holder, heat transfer takes place from the conductor holder to the semifinished product and the semifinished product or the matrix material contained in the semifinished product melts.
Due to the melting process, a positive connection is produced between the placed semi-finished product and the conductor holder.
The positive locking results in the semi-finished product being securely fixed to the wire support and a rapid displacement movement of the wire support can be achieved without the semi-finished product being displaced on the grate.
In the sense of the present invention, in particular so-called organic sheet materials or FKV inserts can be regarded as semi-finished products. Furthermore, the following products can be considered as semi-finished products in the sense of the present invention:
-semi-finished product of natural fibres
-nonwoven material
-an integral flat semi-finished product consisting of fibres and a thermoplastic or thermosetting matrix.
Typical fiber-matrix combinations are:
glass fabrics with Polypropylene or Polyamide
-carbon fibre fabrics with polyamide
-Unidirectional (UD) layer construction with polyamide or polypropylene
-natural fiber polypropylene nonwoven material
Drawings
The invention is described in detail below with the aid of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 shows an injection molding apparatus with a heating device according to the invention;
FIG. 2 shows a wire standoff with parallel wires;
fig. 3 shows a wire mount with crossing wires.
Detailed Description
An exemplary injection molding machine 1 is shown in fig. 1. The injection molding machine 1 has a
In fig. 1, a heating device according to the invention, which is designated as a whole by
Between the
Fig. 2 shows a first embodiment of a
Measures may be taken to set the temperature of the wire 32 in a suitable manner, namely:
-pre-heating the wire to a temperature above the melting temperature of the organic sheet. For polyamide organic sheets, for example, 260 ℃.
In this case, the temperature of the wire grid is regulated by at least one thermocouple, one of which is fastened to a wire or a plurality of which are each fastened to a wire. Preferably, thermocouples with small dimensions can be used for this purpose in order to keep the thermal mass as low as possible.
Together with suitable switching elements, such as Solid State Relays (SSRs), the temperature rise can now be measured and regulated by the duration of the applied voltage. It is likewise conceivable to adapt the voltage or current intensity accordingly.
Temperature regulation by means of the switch-on duration is known and is known, for example, from ceramic heating bands or infrared temperature regulation.
The wire support, which is tempered to a temperature above the melting temperature, is therefore present at the moment the organic sheet is placed on the grate.
By the contact between the organic sheet and the wire holder, heat transfer from the wire holder to the organic sheet is generated and the organic sheet or the matrix material contained in the organic sheet is melted.
Due to the melting process, a form-locking connection is produced between the placed organic sheet and the conductor support.
This form-locking results in a secure fastening of the organic sheet material to the wire support and a rapid displacement movement of the wire support without the organic sheet material being displaced on the grate.
Fig. 3 shows a second embodiment of the
The
List of reference numerals
1 injection moulding machine
2 machine base
3 fixed die clamping plate
4 moving mold clamping plate
5 horizontal column
6 Linear guide device
7 first half of injection mould
8 second injection mould half
9 organic plate
20 heating device
21 furnace
22 carriage system
23 track
24 track
25 sliding rack
30 wire holder
31 frame
32 wire
32a conductor
32b conducting wire
33 connecting cable
34 connecting cable
35 power supply
36 temperature sensor
37 regulator
40 robot
41 gripping device
- 上一篇:一种医用注射器针头装配设备
- 下一篇:具有热量存储能力的太阳能烹饪设备