ES2724924A1 - Internally threaded heating device with a thermocouple for threaded bars - Google Patents

Abstract

The invention relates to an internally threaded heating device with a thermocouple, formed by a thermocouple and a heating resistor that can have different forms, such as (fig. 5a) a tube, (fig. 5b) a wire coil, (fig. 5c) a printed resistor, (fig. 5d) a band heater or positive-temperature-coefficient (PTC) thermistor. The various types of resistor and the thermocouple (fig. 24) surround (fig. 10) a metal piece (fig. 6) that acts as a support. An internal drill hole (fig. 7) is made in the metal piece and then a determined thread (fig. 8) is made in the hole, producing an internally threaded cylinder (fig. 9). The assembly is coated (fig. 11) with a metallic or ceramic flux material to produce better contact between the resistor and the threaded cylinder, the power cables and the thermocouple cables being left uncoated, the assembly forming an internally threaded heated piece having infinite internal and external dimensions, depending on the diameter of the threaded bar to be heated. The internally threaded heating device with a thermocouple, for threaded bars, can be used in industry to replace current methods for heating threaded bars, for example 3D-printing extruders that have a threaded bar through the inside of which solid plastic moves, the plastic being heated to transform into a liquid, the extruders comprising a block with cartridge resistors and thermocouples, separately, to heat the plastic.

Description

INTERNAL THREAD WARMING DEVICE WITH THERMOCOPY FOR

THREADED BARS

DESCRIPTION

SECTOR OF THE TECHNIQUE

The object of the invention falls within the heating devices, being a minor good of molds, metal parts or machinery.

BACKGROUND OF THE INVENTION

Within the existing technique for heating threaded bars (5) shown in Figure 1, a metal mold (1) is made to which a threaded hole (2) is made, another hole is made and a cartridge resistance ( 3) As a heat source, a 3rd hole is made where the temperature probe (4) is inserted, to finish the threaded rod (5) with an internal through hole to be heated in the threaded hole (2) is introduced and energized the cartridge resistance (3), transmitting heat (6) through the metal mold (1) from the cartridge resistance (3) to reach the threaded rod (5), receiving heat first from the side (7) and not Throughout the perimeter of the threaded bar _{(5), which causes the solid plastic material (11) to melt first on the one} hand, producing extrusion waiting and faults, it is a more bulky construction method, the temperature probe (4) is further away from the threaded bar (5), which implies a delay in t Time to mark the temperature and does not have the temperature accuracy as it is farther from the melting material outlet (10).

Another way of heating is with nozzle resistors fixed with tortillería, which does not allow 100% contact with the threaded bar, as it does not touch the striations of the threaded bar in its entirety.

Another means of heating is with a gas torch directly to the bolt, where there is no temperature control or induction precision, where the equipment is too bulky to install.

EXPLANATION OF THE INVENTION

The object to which the object of the invention to be patented refers is defined by the following description, which is not intended to be limiting of its scope.

In the heating apparatus of the existing technique shown in Figure 1, the most obvious problems are the lack of temperature control, when it is _{introduced through the through hole of the threaded rod (5) plastic solid material} normally (11) and by means of energizing the cartridge resistance (3) that emits temperature transforming it into a liquid (8), the heat emitted by the cartridge resistance (3) first melts the plastic that circulates inside the threaded rod (5) closest to the cartridge resistance (3), taking longer to heat the entire threaded bar (5) equally. When constructing heated molds containing threaded holes plus temperature sensors and a housing for the electrical resistance of the cartridge, the resulting object is obviously larger and less precise. In the solution of the present invention, as seen in Figures 2 and 3, it is proposed to build a _{heating apparatus with a heating resistor (12) and thermocouple} incorporated (13) in a socket (15) made with filler material (metallic or refractory paste) forming a set with a certain through thread inside fully adjustable to the thread of the threaded bar (17). The advantages are:

1 ° Allow the heating resistor (12) to be installed as close to the threaded bar (17) achieving a uniform temperature throughout the perimeter (20) and allowing if solid plastic is introduced to transform all this into liquid plastic (21 ) at the same time

2 ° Considerable reduction in the volume of current heating systems.

3 ° Precise adjustment between the threaded rod (17) and the heating device offering excellent heat transmission (22).

4th Lack of additional restraint systems.

5th Temperature regulation more precise when placing the probe or thermocopy (13) as close as possible to the thread of the threaded rod (17).

6 ° Absence of connections seen, avoiding short circuits and breaks.

7 ° Watertight, protected from excess circulating material, shocks, vibrations.

8 ° Cleaning with any method (wet, blown, scraped).

BRIEF DESCRIPTION OF THE DRAWINGS

_{To complement the description that is being made and in} order to help a better understanding of the characteristics of the invention, a set of drawings is attached as an integral part of said description, where illustrative and non-limiting nature has been represented. next:

Figure 1.- Shows a sectioned front view of the current state of the art.

Figure 2.- Shows a sectioned front view of the internal thread heating apparatus with thermocopy.

Figure 3.- Shows a sectional top view of the internal thread heating apparatus with thermocopy.

Figure 4.- Front sample of the internal thread heating apparatus with _thermocopy.

Figure 5§- Shows view of cartridge resistance with built-in probe.

Figure.5b- Shows view of resistance of heating wire in the form of a worm.

Figure.5- Shows view of resistance printed PTC thermistors.

Figure 5d- Shows resistance view of sheet metal clamp.

Figure 6- Shows metallic support view.

Figure 7- Shows sectional view of metal support with drill.

Figure 8- Shows sectional view of metallic support with threading.

Figure 9- Shows metallic support view with threaded and finished.

Figure 10- Shows view of the rolled support a resistance with thermocouple.

Figure 11- Shows metallic support filled with flux or refractory paste.

Figure 12 shows a sectioned front view of the internal thread heating apparatus with thermocopy with threaded bar.

Claims (3)

1 ° Internal thread heating apparatus with thermocopy to heat threaded bars (17) with a through hole in its interior for the purpose of melting plastic, it is formed by a set of the following elements, electric heating resistance (12), thermocopy (13 ) and metal bushing (15) with an internal thread, all connected together and electrified by an electrical cable for connection to the mains, characterized by having the same thread and internal passage inside the metal support (15) as the thread outside of the threaded rod (17) to be heated. 2 ° Internal thread heating apparatus with thermocopy for heating threaded bars (17) with a through hole inside, according to claim 1, whose heating electric resistance (12) surrounds the entire outer perimeter of the threaded bar (17) and is configured to emit heat and by conduction increase the temperature of the threaded rod (17) throughout its perimeter (22) at the same time. 3a Internal thread heating apparatus with thermocopy for heating threaded bars (17) with a through hole inside, according to claim 1, wherein the thermocopy (13) is arranged between the heating electric resistance (12) and the thread of the threaded rod (17).