WO2018091945A1 - 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

 D E S C R I P C I Ó N

Internal thread heating device with thermocopy for threaded bars

 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 technique for heating threaded bars (figure 1), a metal mold (1) is made that is drilled and threaded (2), another hole is made and a cartridge resistance (3) source of heat, a 3rd hole is performed where the temperature probe (4) is introduced, to finish the threaded rod to be heated into the threaded hole (5) and the resistance is energized, emitting temperature by transmitting it (or) through the mold from the resistance until it reaches the threaded bar (5), the temperature is first received by one side (7) not all the perimeter of the threaded bar which causes the solid plastic material (1 1) to melt first by one side producing extrusion waiting and faults (8), is a more bulky construction method, the temperature probe (4) is further away from the threaded bar, which entails a delay in time in marking the temperature and does not have the temperature accuracy being further away d e the output of the flux material (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 gas torch directly to the bolt

, where there is no temperature control or accuracy

 By induction, where the equipment is too bulky to install EXPLANATION OF THE INVENTION

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

Heater apparatus of the existing technique (figure 1), the most important problems evident with the methods of heating existing threaded bars, are the lack of temperature control, when plastic solid material (1 1) is introduced inside the threaded bar (5) and by means of energizing the resistance (3 ) that emits temperature transforming it into liquid (8), the heat emitted by the resistance first melts the plastic that circulates inside the threaded bar closest to the cartridge resistance (7), taking longer to heat the whole equally of the threaded bar, when building 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, the solution (figure 2), (figure 3) is poses in building a resistance

heater (12) with built-in thermocouple (13) that surrounds an internally threaded bushing (14) and the assembly is fused with filler material (metallic or refractory paste) (15) forming a set with a through thread (Fig. 4) determined inside fully adjustable to the thread of the bar, the advantages are:

1 ° Allow the heating wire (16) to be installed as close to the threaded bar (17) achieving a uniform temperature throughout the entire

perimeter (20) and allowing the solid plastic (23) to circulate into liquid plastic (21) at the same time

2 ° Considerable reduction in the volume of current heating systems

3rd precise adjustment between the threaded rod and the cylindrical resistance offering excellent heat transmission. (22)

4th lack of additional restraint systems.

5th temperature regulation more precise when placing the probe as close as possible to the thread of the bar. (13)

6 ° absence of connections seen, avoiding short circuits and breakages

7 ° waterproof, 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. It 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 5a - Shows cartridge resistance view with built-in probe.

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

Figure 5c-Sample view of resistance printed PTC thermistors.

 Figure 5d-Shows view of sheet clamp resistance.

Figure 6-Sample metal support view.

 Figure 7-Sample view sectioned metal support with drill.

 Figure 8-Sample view sectioned metal support with threaded.

 Figure 9-Sample view metal support with threaded and finished.

 Figure 1 0-Sample view of the rolled support a resistance with thermocouple. Figure 1 1 - Shows metallic support filled with flux or refractory paste.

 Figure 1 2- Shows a sectioned front view of the internal thread heating apparatus with thermocopy with threaded bar.

Claims

1 ° Internal thread heating apparatus with thermocopy to heat threaded bars with a through hole in its interior with the purpose of melting plastic, is formed by a set of the following elements, electric heating resistance, thermocopy and metal support with an internal thread, all connected to the assembly and electrified by an electrical cable for connection to the mains (fig.4). Characterized by having the same internal thread and passage inside the metal support (fig. 9) as the outer thread of the hollow cylindrical piece that we intend to heat. (Figure 12) 2 ° Internal thread heating apparatus with thermocopy for heating threaded bars with a through hole inside, According to claim 1, it contains a heating resistor that is surrounding the entire outer perimeter (12) of the threaded bar (17), emitting heat and by conduction we increase the temperature of the threaded bar all its perimeter (22) at the same time, inside of the threaded bar circulates solid plastic (23) turning it into liquid (21), the effect will occur in length of the width of the Internal thread heating device with thermocopy (Fig. 4) 3 ^a Heater apparatus with thermocopy of internal threads for threaded bars with a through hole inside According to revindicacionl, the thread of the bar is fully in contact (14) with any surface of the internal thread internally threaded bushing (f¡g. 9), facilitating heat conduction throughout the perimeter of the thread 4 ^a Heating apparatus with thermocopy of internal threads for threaded bars with a through hole inside, According to claim 1 the thermocopy is placed at the closest point between the resistance and the thread of the bar (13)