CN102869139B - Uniform induction heating device for surface of tubular or columnar object - Google Patents

Abstract

The present invention provides a device for uniformly induction heating the surface of a tubular or columnar object, comprising a tubular or columnar object, a hollow heat-insulating sleeve and an electromagnetic induction heating unit; the electromagnetic induction heating unit further comprises a heating coil and a plurality of magnetic flux concentrators; after the tubular or columnar object is fixed in the hollow heat-insulating sleeve, the electromagnetic induction heating unit is then wrapped around the outer side of the heat-insulating sleeve, and then the electromagnetic induction heating unit generates eddy currents on the surface of the tubular or columnar object due to the electromagnetic effect, and the direction of the magnetic flux lines is limited by the magnetic flux concentrators, thereby improving the heating efficiency, making the tubular or columnar object uniformly and quickly heated, and the heat energy is not easily dissipated by the heat-insulating sleeve, thereby improving the heating efficiency and reducing the advantages and effects of heat energy dissipation.

Description

Uniform induction heating device for the surface of tubular or cylindrical objects

technical field

The invention relates to a uniform induction heating device for the surface of a tubular or columnar object, in particular to a device that uses a magnetic block to limit the direction of the magnetic force line to improve the efficiency of electromagnetic induction, and then generates an eddy current for the tubular or columnar object of the magnetic sensitive material to generate uniform, Fast heating device.

Background technique

During plastic injection/extrusion molding, the plastic is injected into a tubular or cylindrical barrel and then squeezed into the mold. The barrel is usually a high-temperature resistant tubular or cylindrical object (hereinafter referred to as the object). The object is continuously heated, so that the plastic in the object is in a molten state, so that it can be smoothly injected into the sprue of the mold, and in order to maintain a stable flow and avoid premature cooling of the molten plastic, therefore, before plastic injection/extrusion molding, must Continuously heat the heated object to a predetermined temperature, so that the plastic can continue to maintain a molten state, so that it can flow from the object into the mold cavity reliably and smoothly, and then cool and form; it is not only used in plastic injection/extrusion molding, but also in other applications The mold forming process such as aluminum alloy casting and magnesium alloy casting adopts the same method.

However, the heating device used in existing extrusion/injection molding machines is usually a low-cost resistance heating device, which includes a power supply, a resistance heating coil, and a heated object that can accommodate plastic , the resistance heating coil is mainly made of conductive metal material with high heat analysis, using the principle of metal conduction heat analysis, when the current passes through the resistance heating coil, the high heat analysis metal material directly converts electrical energy into heat energy, so, Rapid heating of the heated object, and then transfer heat to the inside of the heated object by radiation or conduction, so that the plastic inside the heated object melts into a molten slurry, so that the plastic can flow smoothly into the mold cavity and then cooled and formed; The overall structure of the resistance heating device is simple and the cost is low, but its disadvantage is that the heating is not uniform, and the heat energy can only be transferred according to the relative layout position of the coil, resulting in extremely high temperature of the part of the heated object located in the resistance heating coil, and the heated object is not under heating. The temperature of the coil part is relatively low, resulting in uneven surface temperature of the heated object. In addition, the resistance heating coil is not efficient in converting electrical energy into heat energy. In comparison, a large amount of electric energy must be consumed to heat the object to be heated. to the desired heating temperature.

Second, another heating device used in existing extrusion/injection molding machines, as shown in the patent case of "barrel heating structure of extrusion/injection molding machine" (hereinafter referred to as the first case) of Taiwan New Certificate No. M365253 , which includes a material tube for storing plastic to be heated, a heating coil that can be energized to generate heat to heat the material tube, and a power supply device for supplying power to the heating coil. When the power supply device transmits current to the heating coil , and the heating coil generates eddy currents on the surface of the material tube due to electromagnetic induction, and the material tube itself generates heat energy due to resistance, so the material tube and its interior are heated; in addition, a refractory Cotton, according to this, can effectively isolate the heat of the material tube from escaping to the external environment, and can greatly improve the heating efficiency of the material tube and the plastic; however, the first proposal uses the principle of electromagnetic induction to generate eddy currents on the material tube and then Heating, its heating efficiency is better than that of the existing resistance heating device, but the magnetic force lines generated by the heating coil of the first case are randomly distributed, and there are many magnetic force line loops, and the magnetic field directions of these magnetic force line loops are not unified. Therefore, it is impossible to make the most effective use of these magnetic force lines, and the eddy current value generated by each place on the surface of the material tube is different, and the heating coil layout density is high, which is very easy to cause the surface and internal temperature of the material tube to be too high , while the layout density of heating coils is lower, and vice versa, resulting in the disadvantage of uneven heating as a whole.

Again, another existing heating device used for hot runners, as shown in the Taiwan Patent No. M280908 "Hot runner heating coil tightening structure" (hereinafter referred to as the second case), mainly includes a hot runner The runner body, a fixing piece, a heating coil, a ring, and a ring, the fixing piece locks the hot runner body, and the heating coil is set on the surface of the hot runner body, and the ferrule is placed on the The appearance of the heating coil, by means of the heating coil, heats the hot runner body through electromagnetic induction, and also prevents the excessive expansion of the heating coil due to thermal expansion and contraction, so that there is no heating between the heating coil and the heating tube of the hot runner body. The gap is used to improve the heating effect, but the heating coil also uses the generated magnetic force lines to be randomly distributed, and there is also the lack of the first solution, which cannot make the most effective use of the above-mentioned magnetic force lines, resulting in the disadvantage of uneven heating as a whole.

In view of the problems of uneven heating, poor heating efficiency, and easy dissipation of heat conduction in the above-mentioned existing heating devices, our inventors specially researched and improved the induction heating device with a uniform surface, and came out with the present invention.

Contents of the invention

Therefore, the surface uniform induction heating device for tubular or columnar objects provided by the present invention mainly solves the problems of uneven heating, poor efficiency, and easy dissipation of heat energy in existing heating devices.

The main purpose of the present invention is to provide a uniform induction heating device for the surface of a tubular or columnar object, which includes at least one tubular or columnar object. The tubular or columnar object is made of a magnetically sensitive material. A locking hole and two fixing holes; at least one hollow heat insulating sleeve, the heat insulating sleeve is made of non-magnetic material, the heat insulating sleeve can be sleeved on the outside of the tubular or columnar object, and the heat insulating sleeve A locking through hole is provided on the side walls at both ends relative to each locking hole of the tubular or columnar object; the plurality of locking accessories, when these locking accessories pass through the locking through holes of the heat insulating sleeve, are locked. on the locking hole of the tubular or columnar object, so that the tubular or columnar object is assembled on the inside of the heat insulating sleeve; a plurality of spacers, these spacers respectively include a fixing part and a spacer part, the fixing part It is assembled in the fixing hole of the tubular or columnar object, and the spacer has a spacing thickness, so that the two opposite surfaces of the heat insulating sleeve and the tubular or columnar object form a fixed equidistant interval according to the spacing thickness; and an electric The magnetic induction heating unit surrounds and covers the outer side of the heat insulating sleeve.

According to the above-mentioned uniform induction heating device for tubular or columnar objects, the electromagnetic induction heating unit further includes a heating coil and a plurality of magnetic conductive blocks, the heating coil is an electromagnetic induction heating coil, and the magnetic conductive blocks are Equidistantly and in the same direction, the heating coil is sleeved, and the two are combined into a flexible body using industrial glue to form the electromagnetic induction heating unit. Next, the electromagnetic induction heating unit is guided inwardly with the heating coil The magnetic block is outside and surrounds the outer side of the heat insulating sleeve.

According to the above-mentioned uniform induction heating device for tubular or columnar objects, the electromagnetic induction heating unit adopts a single-layer spiral method to surround the outer side of the heat-insulating sleeve, or adopts a single-layer folded line method to sequentially surround the outer two ends of the heat-insulating sleeve Arranged back and forth to cover the outer side of the heat insulating sleeve.

According to the above-mentioned uniform induction heating device for the surface of tubular or columnar objects, firstly, two tubular or columnar objects are arranged at intervals, and then the hollow heat-insulating sleeve is set on the outside of the two tubular or columnar objects, and then, the electric The magnetic induction heating unit surrounds the outer side of the heat insulating sleeve with the heating coil facing inward and the magnetic block facing outward.

According to the above-mentioned uniform induction heating device for tubular or columnar objects, the electromagnetic induction heating unit further includes a heating coil, a plurality of magnetic conductive blocks and a coilable sheet, and the magnetic conductive blocks are equidistant Arrange and spread over the sheets, and connect the two. Next, make the heating coil wrap around the outer side of the heat insulating sleeve, and then cover the sheet with the magnetic permeable block on the outer layer of the heating coil.

According to the above-mentioned uniform induction heating device for the surface of tubular or columnar objects, the heating coil is wound around the outer side of the heat insulating sleeve in a single-layer spiral manner, or arranged back and forth in sequence at both ends of the outer heat insulating sleeve in a single-layer broken line manner Set and cover the outer side of the heat insulating sleeve.

According to the above-mentioned uniform induction heating device for the surface of tubular or columnar objects, firstly, two tubular or columnar objects are arranged at intervals, and then the hollow heat insulating sleeve is set on the outside of the two tubular or columnar objects, and then the heating coil After wrapping around the outer side of the heat insulating sleeve, the sheet body on which the magnetic permeable block is laid is then wrapped on the outer layer of the heating coil.

According to the above-mentioned uniform induction heating device for the surface of tubular or columnar objects, the heat insulation sleeve is a ceramic tube or heat insulation cotton with good heat insulation effect.

With the above settings, compared with the prior art, the electromagnetic induction heating unit of the present invention contains a magnetically conductive block, which uses the magnetically conductive block to limit the direction of the magnetic force line, and aligns the magnetic force line with the tubular or columnar object to generate a uniform eddy current with maximum efficiency. In order to uniformly and quickly heat the tubular or columnar objects, and improve the heating efficiency, in addition, the material of the heat insulating sleeve itself has the effect of heat insulation, and there is a gap between the heat insulating sleeve and the tubular or columnar objects, so there is only radiation heat transfer without conduction The heat is dissipated, and then the heat energy around the tubular or columnar object is blocked by the heat insulating sleeve. Therefore, it has the advantages and effects of reducing heat energy dissipation.

Description of drawings

Fig. 1 is the three-dimensional exploded view of the first basic configuration A of the present invention;

Fig. 2 is the combination schematic diagram of the first basic configuration A of the present invention;

Fig. 3 is the use schematic diagram (before assembling) of glue filling mold of the present invention;

Fig. 4 is the use schematic diagram (after assembling) of glue filling mold of the present invention;

Fig. 5 is the electromagnetic induction heating unit combined by glue filling according to the present invention;

Fig. 6 is a three-dimensional exploded schematic view of the first embodiment of the present invention;

7 is a schematic perspective view of the first embodiment of the present invention;

Fig. 8 is a sectional view of the first embodiment of the present invention;

Fig. 9 is a schematic diagram of the laying of the magnetic block of the present invention on the sheet;

Fig. 10 is a three-dimensional exploded schematic view of the second embodiment of the present invention;

Fig. 11 is a schematic perspective view of the second embodiment of the present invention;

Fig. 12 is a sectional view of the second embodiment of the present invention;

Fig. 13 is a three-dimensional exploded schematic view of the third embodiment of the present invention;

Fig. 14 is a schematic perspective view of a third embodiment of the present invention;

Fig. 15 is a sectional view of a third embodiment of the present invention;

Fig. 16 is a three-dimensional exploded schematic view of the fourth embodiment of the present invention;

Fig. 17 is a schematic perspective view of a fourth embodiment of the present invention;

Fig. 18 is a cross-sectional view of a fourth embodiment of the present invention;

Fig. 19 is a three-dimensional exploded view of the second basic configuration B of the present invention;

Fig. 20 is a combined schematic diagram of the second basic configuration B of the present invention;

Fig. 21 is an exploded perspective view of a fifth embodiment of the present invention;

Fig. 22 is a schematic perspective view of the fifth embodiment of the present invention;

Fig. 23 is an exploded perspective view of the sixth embodiment of the present invention;

Fig. 24 is a schematic perspective view of the sixth embodiment of the present invention.

Explanation of reference signs: 1-tubular or columnar object; 11-locking hole; 12-fixing hole; 2, 2'-insulation sleeve; 21, 21'-locking through hole; 3-locking accessory; 4-interval 41-fixed part; 42-interval part; 5, 5'-electromagnetic induction heating unit; 51, 51'-heating coil; 52, 52'-magnetic block; 53'-sheet body; 6-filling mold ; 61-groove; 62-groove; A-first basic configuration; B-second basic configuration.

Detailed ways

With regard to the technical means of the present invention, several feasible embodiments are described in detail below in conjunction with the drawings, so as to provide the above-mentioned in-depth understanding and approval of the present invention.

The first to fourth embodiments of the present invention, as shown in FIG. 1 , include a tubular or columnar object 1, which is made of magnetically sensitive material, and at least two locks are respectively arranged on the side walls at both ends thereof. Attached hole 11 and two fixing holes 12; a hollow cylindrical heat insulating sleeve 2, the heat insulating sleeve 2 is a ceramic tube or heat insulating cotton made of non-magnetic material, and the inner diameter of the heat insulating sleeve 2 is larger than the tubular or The outer diameter of the columnar object 1, and the side walls at both ends of the heat insulating sleeve 2 are provided with a locking through hole 21 relative to each locking hole 11 of the tubular or columnar object 1; The attachments 3 are configured according to the number of locking holes 11 of the tubular or columnar object 1, and these locking attachments 3 pass through the locking through holes 21 of the heat insulating sleeve 2, and are locked to the locking holes of the tubular or columnar object 1. On the hole 11, so that the tubular or columnar object 1 is assembled on the inner side of the heat insulating sleeve 2; a plurality of spacers 4, these spacers 4 are arranged according to the number of fixing holes 12 of the tubular or columnar object 1, and the The spacers 4 mentioned above respectively include a fixing part 41 and a spacer part 42, the fixing part 41 is assembled in the fixing hole 12 of the tubular or columnar object 1, and the spacer part 42 has a spacer thickness, according to the needs of users And determine its interval thickness, make the heat insulating sleeve 2 and the two opposite faces of this tubular or columnar object 1 form a fixed equidistant interval according to the interval thickness, form the first basic configuration A by means of the above-mentioned elements, and then make the second A basic configuration A combines electromagnetic induction heating units 5, 5' to form a completed uniform induction heating device for the surface of tubular or columnar objects; in addition, an electromagnetic induction heating unit 5, 5' (not shown yet, to be described in the following embodiments drawing), the electromagnetic induction heating unit 5, 5' has different configurations according to different embodiments, the electromagnetic induction heating unit 5 includes a heating coil 51 and a plurality of magnetic conductive blocks 52, and the electromagnetic induction heating unit 5' includes a heating A coil 51', a plurality of magnetic conductive blocks 52' and a coilable sheet 53', wherein the heating coils 51, 51' are electromagnetic induction heating coils, and the magnetic conductive blocks 52, 52' have a C Shaped opening, the electromagnetic induction heating unit 5, 5' is externally connected to a power supply (not shown) that generates low frequency, medium frequency or high frequency.

Here, the inventor needs to specifically point out that after the heating coils 51, 51' are manufactured, the infrared thermal images can be used to detect the heating results of the heating coils 51, 51', and then the temperature of the heating coils 51, 51' is relatively high. It is sufficient to lay the magnetic permeable blocks 52, 52' at low places, and this method of partially laying the magnetic permeable blocks 52, 52' has the advantage of reducing manufacturing costs. The electromagnetic induction heating units 5, 5' of the following embodiments are no matter what This configuration is mainly based on the example that the heating coils 51, 51' are completely covered with magnetic blocks 52, 52' (as shown in the diagrams of various embodiments), but the heating coils 51, 51' can be used according to the actual application requirements , and only partially lay the magnetic permeable blocks 52, 52'.

Regarding the combined state of the first basic configuration A of the single tube of the first to fourth embodiments of the present invention (not including the electromagnetic induction heating unit 5, 5'), as shown in FIG. 4 groups are set in the fixing holes 12 of the tubular or columnar object 1, and then the heat insulating sleeve 2 is set on the outside of the tubular or columnar object 1, and by virtue of these spacers 4, the heat insulating sleeve 2 is set on the tubular or columnar object. The two opposite surfaces of the object 1 form an equidistant interval. Next, align the locking through hole 21 of the heat insulating sleeve 2 with the locking hole 11 of the tubular or columnar object 1, and place the locking parts 3 through the After the locking through hole 21 of the heat insulating sleeve 2, it is locked on the locking hole 11 of the tubular or columnar object 1. Accordingly, the relative position of the tubular or columnar object 1 and the heat insulating sleeve 2 is kept stable, maintaining a Equidistantly spaced, the above is the first basic configuration A of the uniform induction heating device for the surface of the tubular or columnar object, and an electromagnetic induction heating unit 5, 5' must be added to form a complete configuration.

The complete configuration combination state of the first embodiment of the present invention is shown in Fig. 1 to Fig. 8, wherein, the electromagnetic induction heating unit 5 combines the heating coil 51 and the magnetic block 52 using a potting mold 6 to form a Flexible body, as shown in Figure 3 to Figure 5, the mold 6 is a long strip, its length is determined according to the user's needs, and the mold 6 is dug inward from the top surface along the direction of the strip extension to provide a heating coil 51 parallel to the groove 61 that is submerged in, and a plurality of grooves 62 for the insertion of the magnetic block 52 are respectively formed on the two vertical walls of the groove 61, and the grooves 62 are arranged at equal intervals along the elongated direction , and the width of these grooves 62 is wider than the groove 61;

Regarding the use state of the glue filling mold 6, please continue to refer to Figures 3 to 5. First, place the heating coil 51 in parallel between the grooves 61 of the glue filling mold 6. Next, insert the magnetic block 52 into the mold in sequence. 6 Groove 62, so that the magnetic block 52 is sleeved on the outside of the heating coil 51 in the same direction, and the length of the heating coil 51 with the magnetic block 52 is determined according to the needs of the user. Continue, use industrial glue to pour Between the groove 61 and the groove 62, after the industrial glue is solidified, the heating coil 51 and the magnetic conductive blocks 52 are combined into a flexible body to form the electromagnetic induction heating unit 5, as shown in FIG. 5 Show;

Again, referring to Fig. 6 to Fig. 8, let the electromagnetic induction heating unit 5 which is integrated by potting glue have the heating coil 51 facing inward and the magnetic block 52 outside, and surround the tubular or The outer side of the thermal insulation sleeve 2 of the first basic configuration A of the columnar object surface uniform induction heating device makes the magnetic conductive block 52 further limit the direction of the magnetic force line, and the two ends of the heating coil 51 are connected to the power supply (not shown in the figure). It constitutes a complete uniform induction heating device for the surface of tubular or columnar objects.

The combined state of the complete configuration of the second embodiment of the present invention is shown in Figures 9 to 12, wherein the magnetic conductive blocks 52' of the electromagnetic induction heating unit 5' are laid on the Sheet 53', as shown in Figure 9, forms the electromagnetic induction heating unit 5' by virtue of the heating coil 51' and the magnetic blocks 52' laid on the sheet 53'; 10 to 12, after the heating coil 51' is wound around the outer side of the heat insulating sleeve 2 of the first basic configuration A of the uniform induction heating device on the surface of the tubular or columnar object in a single-layer helical manner, the next step is to lay the magnetic conductive The piece 53' of the block 52' is wrapped on the outer layer of the heating coil 51', so that the magnetic block 52' can further limit the direction of the magnetic force line, and then align the tubular or columnar object 1, and the two ends of the heating coil 51' are connected to the power supply The supplier (not shown in the figure) constitutes a complete uniform induction heating device for the surface of the tubular or columnar object.

The complete configuration combination state of the third embodiment of the present invention is shown in Figs. 3 to 5 and Figs. The coil 51 and the plurality of magnetic conductive blocks 52 are combined into a flexible body by using the glue filling mold 6 mentioned in the first embodiment to form the electromagnetic induction heating unit 5; The electromagnetic induction heating unit 5 combined by glue filling is arranged with the heating coil 51 inward and the magnetic block 52 outward, and is arranged back and forth at both ends of the heat insulating sleeve 2 in a single-layer folded line manner to surround it. The outer side of the thermal insulation sleeve 2 of the first basic configuration A of the tubular or cylindrical object surface uniform induction heating device makes the magnetic block 52 further limit the direction of the magnetic force line, and the two ends of the heating coil 51 are connected to the power supply (not shown in the figure) ), forming a complete uniform induction heating device on the surface of tubular or columnar objects.

The combined state of the complete configuration of the fourth embodiment of the present invention is shown in Fig. 9 and Fig. 16 to Fig. 18, wherein the magnetic conductive blocks 52' of the electromagnetic induction heating unit 5 are laid in sequence at equidistant intervals In the sheet 53', as shown in FIG. 9, the electromagnetic induction heating unit 5' is formed by means of the heating coil 51 and the magnetic conductive blocks 52' laid on the sheet 53'; As shown in Fig. 16 to Fig. 18, the heating coil 51 is arranged back and forth at both ends of the heat insulating sleeve 2 in the form of a single-layer folded line, and surrounds the surface of the tubular or columnar object to uniformly induce the heat insulation of the first basic configuration A of the heating device. The outer side of the sleeve 2, and the sheet body 53' with the magnetic permeable block 52' is wrapped on the outer layer of the heating coil 51', so that the magnetic permeable block 52' can limit the direction of the magnetic force line, and the two ends of the heating coil 51 are connected to the power supply The supplier (not shown in the figure) constitutes a complete uniform induction heating device for the surface of the tubular or columnar object.

The fifth and sixth embodiments of the present invention rely on a hollow heat insulating sleeve 2' to replace the heat insulating sleeve 2 of the first basic configuration A to form the second basic configuration B, please refer to Fig. 19 to Fig. 20, and the rest The components are the same as the first basic configuration A, and will not be repeated. The heat insulating sleeve 2' is made of ceramic tube or heat insulating cotton made of non-magnetic material, and the hollow part of the heat insulating sleeve 2' can accommodate two tubular or A columnar object 1, and the side walls at both ends of the heat insulating sleeve 2' are provided with a locking through hole 21' relative to each locking hole 11 of the tubular or columnar object 1, and the heat insulating sleeve 2' is matched with two tubular or Columnar object 1, and constitute the second basic configuration B, as shown in Figure 19;

First of all, the combined state diagram of the second basic configuration B is to arrange two tubular or columnar objects 1 in parallel at intervals, and then make the hollow heat insulating sleeve 2' sleeve on the outside of the two tubular or columnar objects, and by virtue of the above These spacers 4 make the heat insulating sleeve 2' sleeved to form a gap with the outside of the tubular or columnar object 1, and then align the locking through hole 21' of the heat insulating sleeve 2' with the locking hole of the tubular or columnar object 1 11 placement, by virtue of the above-mentioned locking parts 3 passing through the locking through hole 21' of the heat insulating sleeve 2', they are locked on the locking hole 11 of the tubular or columnar object 1, so that the tubular or columnar The relative position of the object 1 and the heat insulating sleeve 2' is stable, and a distance is maintained to form the second basic configuration B of the uniform induction heating device on the surface of the tubular or columnar object, as shown in Figure 20;

The complete configuration combination state of the fifth embodiment of the present invention is shown in Fig. 5, Fig. 21 to Fig. 22. First, this embodiment relies on the second basic configuration B of the uniform induction heating device on the surface of the tubular or columnar object, as As shown in Figure 20, with the electromagnetic induction heating unit 5, a complete tubular or cylindrical object surface uniform induction heating device is formed. And the glue filling mold 6 is filled with glue and combined into a flexible body to form the electromagnetic induction heating unit 5; continued, the electromagnetic induction heating unit 5 that is combined with glue is filled with the heating coil 51 inward, magnetically conductive The block 52 is on the outside, and adopts a single-layer spiral method to surround the outer side of the heat insulating sleeve 2' of the second basic configuration B of the uniform induction heating device on the surface of the tubular or columnar object, so that the magnetic conduction block 52 further limits the direction of the magnetic force line, and the heating coil 51 is two The end is connected to a power supply (not shown in the figure) to form a complete uniform induction heating device for the surface of a tubular or columnar object.

The complete configuration combination state of the sixth embodiment of the present invention is shown in Fig. 9, Fig. 23 to Fig. 24. First, this embodiment relies on the second basic configuration B of the uniform induction heating device on the surface of the tubular or columnar object, such as As shown in Figure 20, with the electromagnetic induction heating unit 5', a complete uniform induction heating device on the surface of a tubular or columnar object is formed, and the magnetic conductive blocks 52' of the electromagnetic induction heating unit 5' are equidistantly spaced in sequence Lay on the sheet body 53', as shown in Figure 9; continue, make the heating coil 51' surround the outer side of the second basic configuration B heat insulating sleeve 2' of the uniform induction heating device on the surface of the tubular or columnar object, and The sheet body 53' of the magnetic permeable block 52' is covered on the outer layer of the heating coil 51', so that the magnetic permeable block 52' can limit the direction of the magnetic force lines, and the two ends of the heating coil 51' are connected to the power supply (not shown in the figure). Out), forming a complete uniform induction heating device for the surface of tubular or columnar objects.

With the above settings, when the tubular or columnar object 1 is to be heated, the power supply is turned on to the electromagnetic induction heating unit 5, 5', so that the electromagnetic induction heating unit 5, 5' will target the tubular or cylindrical object of the magnetic sensitive material due to electromagnetic induction. The columnar object 1 generates uniform eddy current, and heats up quickly and uniformly, and has no electromagnetic induction on the heat insulating sleeve 2 of non-magnetic material; because the heating coil 51 is affected by the magnetic block 52, the direction of the magnetic force line is limited, so that the magnetic force line is aligned with the tubular or a columnar object 1, and then the energy of the electromagnetic induction heating unit 5, 5' can be conducted to the surface of the tubular or columnar object 1 through the heat insulating sleeve 2, and a uniform heating surface can be formed by heating without direct contact. The purpose of rapid heating and improving the surface heating efficiency of the tubular or columnar object 1 can be achieved.

With the above settings, the tubular or columnar object 1 described in the first to fourth embodiments of the present invention can be made into a barrel or a hot runner body of an injection/extrusion molding machine, or a set of tubular or columnar objects can be made It is installed outside the barrel of the injection/extrusion molding machine or outside the hot runner body to achieve uniform and rapid heating, so that the plastic inside the barrel or hot runner body can be heated evenly to form a molten slurry, which can be used for injection/extrusion molding , the best quality molded items are obtained.

With the above settings, the tubular or columnar object 1 described in the fifth embodiment to the sixth embodiment of the present invention can be made into a barrel of a twin-screw injection/extrusion molding machine, or the tubular or columnar object 1 can be sleeved on a double-screw injection molding machine. The outside of the barrel of the screw injection/extrusion molding machine is used to achieve uniform and rapid heating, so that the plastic inside the double barrel body can be heated evenly to form a molten slurry, and the best quality molded articles can be obtained during injection/extrusion molding.

In addition, with regard to the first to sixth embodiments of the present invention, in order to prevent the heat dissipation of the tubular or columnar object 1 after heating or preheating, the heating efficiency of the tubular or columnar object 1 will be reduced, or the temperature of the surrounding environment will be raised due to heat dissipation. , causing discomfort to the user, so a heat insulating sleeve 2 is placed around the tubular or columnar object 1 to avoid heat dissipation; and there is an equal distance between the tubular or columnar object 1 and the insulating sleeve 2, so only radiant heat Transfer and dissipate to avoid direct transfer and dissipation of conduction heat, and make the inside of the heat insulating sleeve 2 a heat insulation system. Due to the low temperature dissipation rate during the heat insulation process, there is almost no heat exchange with the outside world, achieving the heat insulation effect.

By virtue of the above description, it can be known that the characteristics and effects of the present invention are:

1. Eddy current for maximum performance:

The present invention can indeed achieve the purpose and demand of uniform and rapid heating of tubular or columnar objects, so the electromagnetic induction heating unit with a magnetic block is used, and the heating coil is limited by the action of the magnetic block to guide the direction of the magnetic force line. The magnetic induction heating unit generates electromagnetic induction to generate eddy current with maximum efficiency on tubular or cylindrical objects. Accordingly, the induced eddy current flow area is affected by the proximity effect and flows only in different areas. Therefore, as long as the frequency and inductance of the entire heating coil are reached , resistance matching, the maximum eddy current can be generated, and the heating efficiency can be improved.

2. With a variety of heating coil configurations:

In the present invention, the heating coils of the first to fourth embodiments are matched with properly arranged magnetic blocks to achieve the purpose of covering tubular or columnar objects and heating them. The coils are bent and wound to form different shapes and curved surfaces.

3. Avoid heat dissipation:

When the heat energy dissipates, thereby reducing the heating efficiency of the tubular or columnar object 1, or the heat dissipation increases the temperature of the surrounding environment, causing discomfort to the user, so an insulating sleeve is placed around the tubular or columnar object; and the tubular or columnar object and There is an equal distance between the insulation sleeves, so only radiant heat is transferred and dissipated, and the inside of the insulation sleeve is a heat insulation system. Due to the low temperature dissipation rate during the heat insulation process, there is almost no heat exchange with the outside world, achieving the heat insulation effect.

The above description is only illustrative of the present invention, rather than restrictive. Those of ordinary skill in the art understand that many modifications, changes or equivalents can be made without departing from the spirit and scope defined in the claims, but All will fall within the protection scope of the present invention.

Claims (7)

1. A uniform induction heating device for the surface of a tubular or columnar object, characterized in that it comprises: At least one tubular or columnar object, the tubular or columnar object is made of magnetically sensitive material, and at least two locking holes and two fixing holes are respectively provided on the side walls at both ends; At least one hollow heat-insulating sleeve, the heat-insulating sleeve is made of non-magnetic material, the heat-insulating sleeve can be sleeved on the outside of the tubular or columnar object, and the side walls at both ends of the heat-insulating sleeve are opposite to the tubular or cylindrical object Each locking hole of the columnar object is provided with a locking through hole; A plurality of locking parts, when these locking parts pass through the locking through holes of the heat insulating sleeve, they are locked on the locking holes of the tubular or columnar object, so that the tubular or columnar object is assembled on the heat insulating sleeve inside; A plurality of spacers, said spacers respectively include a fixing part and a spacer part, the fixing part is assembled in the fixing hole of the tubular or columnar object, and the spacer part has a spaced thickness, so that the heat insulating sleeve and the The opposing faces of the tubular or cylindrical object form a fixed equidistant interval according to the thickness of the interval; and An electromagnetic induction heating unit, the electromagnetic induction heating unit surrounds and covers the outer side of the heat insulating sleeve; The electromagnetic induction heating unit further includes a heating coil and a plurality of magnetic conductive blocks. The heating coil is an electromagnetic induction heating coil. The magnetic conductive blocks are sleeved on the heating coil at equal distances and in the same direction, and are made of industrial glue. The two are combined into a flexible body to form the electromagnetic induction heating unit. Next, the electromagnetic induction heating unit is surrounded on the outside of the heat insulating sleeve with the heating coil facing inward and the magnetic conductive block facing outward. 2. The uniform induction heating device for the surface of tubular or columnar objects according to claim 1, characterized in that, the electromagnetic induction heating unit adopts a single-layer spiral method to surround the outer side of the heat-insulation sleeve, or adopts a single-layer folding line method to surround the heat-insulation sleeve The outer two ends are arranged back and forth in sequence to cover the outer side of the heat insulating sleeve. 3. The uniform induction heating device for the surface of tubular or columnar objects according to claim 1, characterized in that firstly, the two tubular or columnar objects are arranged at intervals, and then the hollow heat insulating sleeve is set on the outside of the two tubular or columnar objects, and then the two tubular or columnar objects are connected. Next, make the electromagnetic induction heating unit surround the outer side of the heat insulating sleeve with the heating coil facing inward and the magnetic block facing outward. 4. The uniform induction heating device for the surface of tubular or columnar objects according to claim 1, wherein the electromagnetic induction heating unit further comprises a heating coil, a plurality of magnetic conductive blocks and a coilable sheet, and these conductive The magnetic blocks are arranged equidistantly and spread over the sheet, and the two are connected. Next, the heating coil is wrapped around the outside of the heat insulating sleeve, and then the sheet with the magnetic block is wrapped around the heating coil. layer. 5. The uniform induction heating device for the surface of tubular or columnar objects according to claim 4, characterized in that the heating coil is wound around the outer side of the heat insulating sleeve in a single-layer spiral manner, or is wound on both sides of the outer side of the heat insulating sleeve in a single-layer broken line manner. The ends are arranged back and forth in sequence and covered on the outside of the heat insulating sleeve. 6. The uniform induction heating device for the surface of tubular or columnar objects according to claim 4, characterized in that firstly, the two tubular or columnar objects are arranged at intervals, and then the hollow heat insulating sleeve is set on the outside of the two tubular or columnar objects, and then Next, after the heating coil is wrapped around the outer side of the heat insulating sleeve, the sheet body on which the magnetic permeable block is laid is then wrapped on the outer layer of the heating coil. 7. The uniform induction heating device for the surface of tubular or columnar objects according to any one of claims 1-6, characterized in that the thermal insulation sleeve is a ceramic tube or thermal insulation cotton with good thermal insulation effect.