CN218041820U - Metal heater - Google Patents

Abstract

The utility model relates to a metal heater, which comprises a shell, a heating assembly and a heating coil; the heating coil is used for heating a workpiece to be heated; the heating assembly comprises a conversion circuit, a protection circuit and a heating driving unit, wherein the conversion circuit is coupled with a power supply end and the protection circuit and is used for converting an alternating current power supply into a low-voltage direct current power supply so as to supply power to the heating driving unit; the protection circuit is coupled between the conversion circuit and the heating driving unit, the heating driving unit is electrically connected with the heating coil, and the heating driving unit is used for applying alternating current to the heating coil so as to heat a workpiece to be heated; by arranging the heating coil, compared with an electric furnace for heating a workpiece to be heated, the heating speed is increased; meanwhile, the safety is improved.

Description

Metal heater

Technical Field

The utility model belongs to the technical field of the metal heater technique and specifically relates to a metal heater is related to.

Background

At present, after a product is demolded frequently in the injection molding process of an injection molding machine, the tail of the product is broken and cannot be taken out of a mold runner to influence subsequent work, a thin metal screw and the like are required to be heated to the temperature capable of melting plastics and then inserted into the middle of the broken plastics in the mold runner, and after the metal screw is cooled, a tool is used for clamping the tail of the metal screw to pull out the broken plastics together.

The traditional metal screw heating method is that an electric furnace is often used for heating, so that the heating is slow, and meanwhile, potential safety hazards exist when the metal screw is heated.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a metal heater, which has the advantages that the heating speed can be improved; meanwhile, the safety is improved.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme: a metal heater comprises a shell, a heating assembly and a heating coil; the heating device comprises a shell, a heating assembly, a heating coil and a heating coil, wherein the shell is enclosed into an accommodating cavity, the heating assembly is accommodated in the accommodating cavity, one end of the heating coil is inserted into the accommodating cavity and is electrically connected with the heating assembly, the other end of the heating coil is positioned outside the accommodating cavity, and the heating coil is used for heating a workpiece to be heated; the heating assembly is used for controlling the heating coil to heat a workpiece to be heated, which is inserted into the heating coil, and comprises a conversion circuit, a protection circuit and a heating driving unit, wherein the conversion circuit is coupled with a power supply end and the protection circuit, and is used for converting an alternating current power supply into a low-voltage direct current power supply so as to supply power to the heating driving unit; the protection circuit is coupled between the conversion circuit and the heating driving unit, the heating driving unit is electrically connected with the heating coil, and the heating driving unit is used for applying alternating current to the heating coil so as to heat the workpiece to be heated.

Preferably, the utility model provides a metal heater, converting circuit includes fuse, time delay outage functional unit and power switching unit, the fuse is coupled between power end and the control switch who sets up on the casing, control switch with time delay outage functional unit is coupled, power switching unit is coupled with time delay outage functional unit in protection circuit; the power conversion unit is used for converting alternating current voltage into low-voltage direct current voltage.

Preferably, the utility model provides a metal heater, be provided with total power indicator on the casing, total power indicator with time delay outage functional unit parallel connection, when control switch closed, total power indicator is bright.

Preferably, the utility model provides a metal heater, protection circuit includes overcurrent protection unit, time delay circular telegram functional unit and relay, overcurrent protection unit is coupled between conversion circuit and the time delay circular telegram functional unit, time delay circular telegram functional unit with the relay is coupled; the relay is connected with the heating driving unit through an electrical parameter display instrument arranged on the shell; the time-delay electrifying functional unit is used for preventing the conversion circuit from causing insufficient excitation of the heating driving unit when the conversion voltage is insufficient.

Preferably, the utility model provides a metal heater, be provided with the display module on the casing, the display module be coupled in converting circuit with between the protection circuit.

Preferably, the utility model provides a metal heater, display module includes low pressure output pilot lamp and radiator fan, low pressure output pilot lamp with radiator fan parallel connection.

Preferably, the utility model provides a metal heater, be provided with drive power supply pilot lamp on the casing, drive power supply pilot lamp be coupled in electrical parameter display instrument with heat between the drive unit.

Preferably, the utility model provides a metal heater installs heating coil a plurality of louvres have been seted up to one side of casing, and are a plurality of the louvre all with hold the chamber intercommunication.

Preferably, the utility model provides a metal heater, the mounting hole has been seted up on the top of casing, the mounting hole with hold the chamber intercommunication, the mounting hole is used for the installation or dismantles heating coil.

Preferably, the utility model provides a metal heater, the mounting hole upper cover is equipped with the apron, the apron pass through connecting bolt with the casing is connected, the apron can be relative the casing rotates, so that the mounting hole exposes.

To sum up, the utility model discloses a beneficial technological effect does: the application provides a metal heater, which comprises a shell, a heating assembly and a heating coil; the heating coil is used for heating a workpiece to be heated; the heating assembly is used for controlling the heating coil to heat a workpiece to be heated, which is inserted into the heating coil, and comprises a conversion circuit, a protection circuit and a heating driving unit, wherein the conversion circuit is coupled with a power supply end and the protection circuit and is used for converting an alternating current power supply into a low-voltage direct current power supply so as to supply power to the heating driving unit; the protection circuit is coupled between the conversion circuit and the heating driving unit, the heating driving unit is electrically connected with the heating coil, and the heating driving unit is used for applying alternating current to the heating coil so as to heat a workpiece to be heated; by arranging the heating coil, compared with an electric furnace for heating a workpiece to be heated, the heating speed is increased; meanwhile, the safety is improved.

Drawings

Fig. 1 is a schematic view of an overall structure of a metal heater according to an embodiment of the present invention.

Fig. 2 is a first side view of a metal heater provided by an embodiment of the present invention.

Fig. 3 is a second side view of the metal heater according to the embodiment of the present invention.

Fig. 4 is a top view of a metal heater according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a heating coil in a metal heater according to an embodiment of the present invention.

Fig. 6 is a circuit diagram of a heating assembly in a metal heater according to an embodiment of the present invention.

Fig. 7 is a circuit diagram of a delayed power-off function unit in a metal heater according to an embodiment of the present invention.

Fig. 8 is a circuit diagram of a time-delay power-on functional unit in a metal heater according to an embodiment of the present invention.

In the figure, 1, a metal heater; 10. a housing; 11. a control switch; 12. a drive switch; 13. a mains power indicator light; 14. an electrical parameter display instrument; 15. a display component; 151. a low voltage output indicator light; 152. a heat radiation fan; 16. driving a power supply indicator lamp; 17. heat dissipation holes; 18. mounting holes; 19. a cover plate; 191. a connecting bolt; 40. a support leg; 41. a handle; 42. a heat dissipation port; 20. a heating assembly; 21. a conversion circuit; 211. a fuse; 212. a delayed power-off functional unit; 2121. a voltage reduction rectification filter circuit; 2122. a voltage stabilizing circuit; 2123. a first timing circuit; 2124. a first relay control circuit; 2125. a first relay; 2126. starting a control signal; 213. a power conversion unit; 22. a protection circuit; 221. an overcurrent protection unit; 222. a delayed power-on functional unit; 2221. a voltage conversion circuit; 2222. a second timing circuit; 2223. a second relay control circuit; 2224. a second relay; 223. a relay; 2231. a relay coil; 2232. a normally open contact of the relay; 23. a heating drive unit; 24. a power supply terminal; 30. a heating coil; 31. winding a coil; 32. a cable; 33. an insulating sleeve.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, a metal heater 1 disclosed in the present invention includes a housing 10, a heating assembly 20, and a heating coil 30; the shell 10 is enclosed into an accommodating cavity, the heating assembly 20 is accommodated in the accommodating cavity, one end of the heating coil 30 is inserted into the accommodating cavity and is electrically connected with the heating assembly 20, the other end of the heating coil 30 is located outside the accommodating cavity, and the heating coil 30 is used for heating a workpiece to be heated; by arranging the heating coil 30, compared with the heating of a workpiece to be heated by adopting an electric furnace, the heating speed is improved; meanwhile, the safety is improved.

The plane parallel to the horizontal plane is taken as a cross section, and the cross section of the accommodating cavity may be rectangular, rhombic or other multiple deformations, which is not limited in this embodiment.

For convenience of explanation, the following description will be given taking as an example a case where the sectional shape of the accommodating chamber is rectangular.

With continued reference to fig. 1 and 2, in the present embodiment, at least two pairs of legs 40 are provided at the bottom end of the casing 10, and the two pairs of legs 40 are spaced apart along the length of the casing 10, wherein each pair of legs 40 includes two oppositely disposed legs 40; by providing the support legs 40, the stable shape of the metal heater 1 can be facilitated while avoiding the metal heater 1 from being affected with moisture.

Wherein, the top of the casing 10 is provided with a handle 41, the handle 41 is connected with the casing 10, and the handle 41 is arranged, thereby being convenient for moving the metal heater 1.

Illustratively, the handle 41 may be U-shaped, but of course, the handle 41 may also be H-shaped. In the implementation of the handle 41 being U-shaped, the open end of the handle 41 is connected to the top end of the housing 10.

The handle 41 may be connected to the housing 10 by bolts, and the handle 41 may be integrally formed with the housing 10 by casting, which is not limited in this embodiment. Further, in the present embodiment, the first side of the housing 10 is provided with a control switch 11, and the control switch 11 is used for controlling the power-off and power-on of the heating assembly 20.

The first side of the casing 10 is further provided with a driving switch 12, the driving switch 12 is electrically connected to the heating element 20, and the driving switch 12 is used for controlling the heating element 20 to be turned on or turned off.

With continued reference to fig. 1 and 5, the heating coil 30 includes a winding coil 31 and a cable 32, one end of the cable 32 passes through an insulating sleeve 33 and is connected with the winding coil 31, the winding coil 31 is enclosed into a heating cavity, and a workpiece to be heated is inserted into the heating cavity during use.

Specifically, a fixing hole is formed in the first side of the housing 10, the fixing hole is communicated with the accommodating cavity, one end of the cable 32, which is away from the winding coil 31, penetrates through the fixing hole and is electrically connected with the heating assembly 20, and the winding coil 31 is located outside the accommodating cavity.

Further, in the present embodiment, a plurality of heat dissipation holes 17 are formed at one side of the housing 10 where the heating coil 30 is installed, and the plurality of heat dissipation holes 17 are all communicated with the accommodating cavity; by providing the heat radiation holes 17, the heat radiation performance is improved, and the service life of the metal heater 1 is prolonged.

Specifically, a plurality of heat dissipation holes 17 are formed in the first side of the housing 10, the plurality of heat dissipation holes 17 are formed around the winding coil 31, and when the winding coil 31 heats a workpiece to be heated, the heat dissipation efficiency is improved.

In order to heat different types of workpieces to be heated, the top end of the shell 10 is provided with a mounting hole 18, the mounting hole 18 is communicated with the accommodating cavity, and the mounting hole 18 is used for mounting or dismounting the heating coil 30.

Specifically, a mounting hole 18 is formed in a position, close to the first side, of the top end of the casing 10, the mounting hole 18 extends along the height direction of the casing 10, one end, away from the winding coil 31, of the cable 32 penetrates through the fixing hole, and a worker connects the cable 32 with the heating assembly 20 through the mounting hole 18.

In order to prevent external dust from entering the accommodating cavity through the mounting hole 18, a cover plate 19 covers the mounting hole 18, the cover plate 19 is connected with the housing 10 through a connecting bolt 191, and the cover plate 19 can rotate relative to the housing 10 to expose the mounting hole 18.

Continuing to refer to fig. 4, specifically, the cover plate 19 is parallel to the horizontal plane, after the heating coil 30 is installed, the cover plate 19 covers the installation hole 18, and one end of the cover plate 19 is connected to the housing 10 through the connecting bolt 191; when the heating coil 30 is replaced, the connecting bolt 191 is loosened, then the connecting bolt 191 is rotated by a preset angle, the connecting bolt 191 drives the baffle to rotate, at the moment, the mounting hole 18 is exposed outside, a worker detaches the heating coil 30 from the heating assembly 20 through the mounting hole 18, and pulls one end of the heating coil 30 out of the accommodating cavity through the fixing hole; then, a new heating coil 30 is installed, a worker connects the cable 32 in the new heating coil 30 with the heating assembly 20 through the installation hole 18, after the installation of the new heating coil 30 is completed, the connecting bolt 191 is rotated reversely, the connecting bolt 191 drives the cover plate 19 to rotate until the cover plate 19 covers the installation hole 18, at this time, the rotation of the connecting bolt 191 is stopped, and the connecting bolt 191 is tightened, so that the cover plate 19 is connected with the housing 10.

In order to further improve the heat dissipation performance of the metal heater 1, two sets of heat dissipation openings 42 are formed at the top end of the casing 10, and the two sets of heat dissipation openings 42 are respectively disposed at two opposite sides of the handle 41, wherein each set of heat dissipation openings 42 includes a plurality of heat dissipation openings 42, and the plurality of heat dissipation openings 42 are distributed in a rectangular array.

The use process of the metal heater 1 provided by the embodiment is as follows: inserting a workpiece to be heated into the heating cavity, attaching the outer peripheral wall of the workpiece to be heated to the inner peripheral wall of the heating cavity, closing the control switch 11, then pressing the driving switch 12, starting the heating assembly 20, introducing alternating current with a certain frequency into the heating assembly 20, generating an alternating magnetic field around the heating coil 30 at the moment, and generating a closed induced current-vortex in the workpiece to be heated under the electromagnetic induction action of the alternating magnetic field; the induced current is not uniformly distributed on the section of the workpiece to be heated, the current density on the surface layer of the workpiece to be heated is high, and the phenomenon that the current density is gradually reduced from outside to inside is called skin effect; the electric energy of the high-density current on the surface layer of the workpiece is converted into heat energy, so that the temperature of the surface layer of the workpiece to be heated is increased, and the workpiece to be heated is rapidly heated.

With continued reference to fig. 1 and 6, in the present embodiment, the heating assembly 20 is configured to control the heating coil 30 to heat a workpiece to be heated inserted in the heating coil 30, the heating assembly 20 includes a converting circuit 21, a protection circuit 22 and a heating driving unit 23, the converting circuit 21 is coupled to the power end 24 and the protection circuit 22, the converting circuit 21 is configured to convert an ac power into a low-voltage dc power to supply power to the heating driving unit 23; the protection circuit 22 is coupled between the conversion circuit 21 and the heating driving unit 23, the heating driving unit 23 is electrically connected to the heating coil 30, and the heating driving unit 23 is used for applying an alternating current to the heating coil 30 to heat the workpiece to be heated.

Further, in the present embodiment, the converting circuit 21 includes a fuse 211, a time-delay power-off functional unit 212 and a power converting unit 213, the fuse 211 is coupled between the power source terminal 24 and a control switch 11 disposed on the housing 10, the control switch 11 is coupled with the time-delay power-off functional unit 212, and the power converting unit 213 is coupled between the time-delay power-off functional unit 212 and the protection circuit 22; the power conversion unit 213 is configured to convert an ac voltage into a low-voltage dc voltage; by arranging the delayed power-off function unit 212, the power supply is automatically cut off after the metal heater 1 is started for a preset time, so that the service life of the metal heater 1 is prolonged.

Specifically, the driving switch 12 is coupled between the control switch 11 and the delayed power-off function unit 212, in the using process, the control switch 11 is turned on, the power supply enters the delayed power-off function unit 212 through the electric shock of the fuse 211 and the control switch 11, at this time, the driving switch 12 is pressed, then, the delayed power-off function unit 212 transmits the alternating current 220V power to the power supply conversion unit 213, the power supply conversion unit 213 outputs a 24V low-voltage direct current power, the 24V low-voltage direct current power is loaded to the heating driving unit 23 through the protection circuit 22, the heating driving unit 23 generates an alternating current with a certain frequency to act on the coil of the metal heater 1, and at this time, when a ferromagnetic object (i.e., a workpiece to be heated) is placed in the heating coil 30, the workpiece to be heated can be rapidly heated.

In order to observe whether the control switch 11 is closed or not, a main power indicator 13 is arranged on the shell 10, the main power indicator 13 is connected with the delayed power-off function unit 212 in parallel, and when the control switch 11 is closed, the main power indicator 13 is on.

With reference to fig. 7, in the present embodiment, the delay power-off function unit 212 includes a buck rectifying filter 2121, a regulator 2122, a first timing circuit 2123, a first relay control circuit 2124, and a first relay 2125, wherein the regulator 2122 is coupled between the buck rectifying filter 2121 and the first timing circuit 2123, and the first relay control circuit 2124 is coupled between the first timing circuit 2123 and the first relay 2125.

In the using process, the ac power enters the buck rectifying filter 2121 through the input end, the buck rectifying filter 2121 converts the ac power into the dc power, the dc power passes through the voltage stabilizing circuit 2122 and then becomes a stable dc low voltage power suitable for the requirement, the dc low voltage power is sent to the first timing circuit 2123, when the driving switch 12 is pressed, the start control signal 2126 is generated, the start control signal 2126 is sent to the timing chip in the first timing circuit 2123, the timing chip continuously outputs a high level to the first relay control circuit 2124 after receiving the start control signal 2126, the first relay control circuit 2124 switches on the coil of the first relay 2125 after working, the coil of the first relay 2125 is powered on, at this time, the normally open contact of the first relay 2125 is actuated, and then the power is output to the following circuits; the first timing circuit 2123 starts timing at the same time, when the set time is reached, the timing chip turns off the high level output, the first relay control circuit 2124 turns off the coil power supply of the first relay 2125 after failing to work, and the normally open contact of the first relay 2125 is opened to cut off the power supply output.

The structure of the power conversion unit 213 is well known to those skilled in the art, and the structure of the power conversion unit 213 is not described herein.

Further, in the present embodiment, the protection circuit 22 includes an overcurrent protection unit 221, a delay-powered functional unit 222 and a relay 223, the overcurrent protection unit 221 is coupled between the conversion circuit 21 and the delay-powered functional unit 222, and the delay-powered functional unit 222 is coupled with the relay 223; the relay 223 is connected with the heating driving unit 23 through the electric parameter display instrument 14 arranged on the shell 10; the delay energization functional unit 222 is used to prevent the switching circuit 21 from causing the heating driving unit 23 to be insufficiently energized when the switching voltage is insufficient.

Specifically, the overcurrent protection unit 221 is coupled between the power conversion unit 213 and the time-delay power-on functional unit 222, the relay 223 is coupled between the time-delay power-on functional unit 222 and the electrical parameter display instrument 14, the electrical parameter display instrument 14 is used for displaying the working parameter number, and the operator can determine the heating condition of the workpiece to be heated according to the working parameter.

Wherein, relay 223 includes relay coil 2231 and relay normally open contact 2232, and in the use, relay coil 2231 gets electric, and relay normally open contact 2232 is closed, and relay coil 2231 loses electric, and relay normally open contact 2232 breaks off.

With reference to fig. 8, in the present embodiment, the time-delay power-on functional unit 222 includes a voltage converting circuit 2221, a second timing circuit 2222, a second relay control circuit 2223, and a second relay 2224, wherein the second timing circuit 2222 is coupled between the voltage converting circuit 2221 and the second relay control circuit 2223, and the second relay control circuit 2223 is coupled to the second relay 2224.

In the using process, after the dc power supply flows into the power supply input end, 5v voltage is output to the second timing circuit 2222 through the voltage conversion circuit 2221, a preset delay time is set for a timing chip in the second timing circuit 2222, voltage is output to the second relay control circuit 2223 after the preset delay time is reached, the second relay control circuit 2223 is powered on, at this time, a coil in the second relay 2224 is powered on, a normally open contact of the second relay 2224 is closed, and then power supply with the same voltage is output to a following circuit from the power supply output end.

It should be noted that the structure of the overcurrent protection unit 221 is well known to those skilled in the art, and the structure of the overcurrent protection unit 221 is not described herein in detail.

With continued reference to fig. 1 and fig. 3, in the present embodiment, the display module 15 is disposed on the housing 10, and the display module 15 is coupled between the converting circuit 21 and the protection circuit 22.

Specifically, the display module 15 is coupled between the power conversion unit 213 and the over-current protection unit 221.

The display module 15 includes a low voltage output indicator 151 and a heat dissipation fan 152, wherein the low voltage output indicator 151 and the heat dissipation fan 152 are connected in parallel.

Specifically, the fuse 211 and the heat dissipation fan 152 are both disposed on the second side of the housing 10, and the heat dissipation fan 152 is used for dissipating heat generated by the metal heater 1, thereby improving the service life of the metal heater 1.

In this embodiment, a power socket is disposed on the second side of the casing 10, wherein the power socket is a power end 24, and the power end 24 is used for connecting with an external power source.

In the using process, after the control switch 11 is closed, the power enters the delayed power-off functional unit 212 through the fuse 211 and the contact of the control switch 11, the main power indicator 13 is lighted at the same time, after the driving switch 12 is pressed, the delayed power-off functional unit 212 outputs the alternating current 220V power to the power conversion unit 213, the power conversion unit 213 converts the alternating current 220V power into the 24V low-voltage direct current power for output, at this time, the low-voltage output indicator 151 is lighted, and meanwhile, the cooling fan 152 is started.

Further, in the present embodiment, a driving power supply indicator 16 is disposed on the housing 10, and the driving power supply indicator 16 is coupled between the electrical parameter display instrument 14 and the heating driving unit 23.

Specifically, the driving power indicator lamp 16 is disposed on a first side of the housing 10, and the driving power indicator lamp 16 is disposed at a distance from the main power indicator lamp 13.

It should be noted that the first side of the housing 10 is disposed opposite to the second side of the housing 10.

For example, the heating driving unit 23 may adopt an oscillation circuit, and when it is hot, the heating driving unit 23 may adopt other structures as long as the heating coil 30 can heat the workpiece to be heated.

In the implementation manner of the heating driving unit 23 using the oscillation circuit, after the power is inputted, the switching tube, the coil, the capacitor and the heating coil 30 in the oscillation circuit cooperate to generate oscillation, and a large current with high frequency change polarity flows through the heating coil 30 wound in a ring shape, so that a strong magnetic beam with instantaneous change polarity is generated in the heating coil 30, at this time, if a ferromagnetic metal waits for a heating workpiece to be placed in the heating coil 30, the magnetic beam penetrates through the whole workpiece to be heated, and when the direction of the internal current of the workpiece to be heated is opposite to that of the heating current, a corresponding large eddy current is generated; because the resistance exists in the workpiece to be heated, a lot of joule heat can be generated, so that the temperature of the workpiece to be heated is rapidly increased, and the purpose of heating the workpiece to be heated is achieved.

The working principle of the metal heater 1 provided by the embodiment is as follows: inserting a workpiece to be heated into a heating cavity, attaching the outer peripheral wall of the workpiece to be heated to the inner peripheral wall of the heating cavity, closing the control switch 11, enabling a power supply to enter the time-delay power-off function unit 212 through a fuse 211 and contacts of the control switch 11, simultaneously lightening the main power indicator 13, pressing the drive switch 12, enabling the time-delay power-off function unit 212 to output an alternating current 220V power supply to the power supply conversion unit 213, enabling the power supply conversion unit 213 to convert the alternating current 220V power supply into a 24V low-voltage direct current power supply for outputting, lightening the low-voltage output indicator 151 at the moment, starting the cooling fan 152, enabling the low-voltage direct current power supply to enter the overcurrent protection unit 221 at the same time, outputting the power supply to the time-delay power-on function unit 222 through the overcurrent protection unit 221 (the function of the time-delay power-on function unit 222 prevents the short-time voltage shortage of the starting of the high-power supply conversion unit 213 from causing insufficient excitation of the subsequent heating drive unit 23 to shorten the service life or damage), switching on a relay 223 coil after a preset time length, enabling the relay 223 coil to be energized, enabling the relay coil to be normally open, enabling the 24V low-voltage direct current power supply to be added to the main contacts of the electrical parameter display 14 through the main contacts of the instrument to be added to be heated, and displaying that when the alternating current of the alternating current 14 to be rapidly loaded on the heating coil of the metal heating coil when the alternating current display unit 30 to be heated metal instrument, and displaying the alternating current to be rapidly loaded on the heating coil, and displaying the alternating current of the alternating current 1.

The metal heater 1 provided by the application comprises a shell 10, a heating assembly 20 and a heating coil 30; the shell 10 is enclosed into an accommodating cavity, the heating assembly 20 is accommodated in the accommodating cavity, one end of the heating coil 30 is inserted into the accommodating cavity and is electrically connected with the heating assembly 20, the other end of the heating coil 30 is located outside the accommodating cavity, and the heating coil 30 is used for heating a workpiece to be heated; the heating assembly 20 is used for controlling the heating coil 30 to heat a workpiece to be heated inserted in the heating coil 30, the heating assembly 20 comprises a conversion circuit 21, a protection circuit 22 and a heating driving unit 23, the conversion circuit 21 is coupled with a power supply end 24 and the protection circuit 22, and the conversion circuit 21 is used for converting an alternating current power supply into a low-voltage direct current power supply to supply power to the heating driving unit 23; the protection circuit 22 is coupled between the conversion circuit 21 and the heating driving unit 23, the heating driving unit 23 is electrically connected to the heating coil 30, and the heating driving unit 23 is used for applying an alternating current to the heating coil 30 to heat the workpiece to be heated; by arranging the heating coil 30, compared with the heating of the workpiece to be heated by adopting an electric furnace, the heating speed is improved; meanwhile, the safety is improved.

The utility model provides a metal heater 1 has following advantage: the device has simple structure, easy manufacture and convenient operation.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.

Claims (10)

1. A metal heater, characterized by: comprises a shell, a heating assembly and a heating coil;

the heating device comprises a shell, a heating assembly, a heating coil and a heating coil, wherein the shell is enclosed into an accommodating cavity, the heating assembly is accommodated in the accommodating cavity, one end of the heating coil is inserted into the accommodating cavity and is electrically connected with the heating assembly, the other end of the heating coil is positioned outside the accommodating cavity, and the heating coil is used for heating a workpiece to be heated;

the heating assembly is used for controlling the heating coil to heat a workpiece to be heated, which is inserted into the heating coil, and comprises a conversion circuit, a protection circuit and a heating driving unit, wherein the conversion circuit is coupled with a power supply end and the protection circuit, and is used for converting an alternating current power supply into a low-voltage direct current power supply so as to supply power to the heating driving unit;

the protection circuit is coupled between the conversion circuit and the heating driving unit, the heating driving unit is electrically connected with the heating coil, and the heating driving unit is used for applying alternating current to the heating coil so as to heat the workpiece to be heated.

2. The metal heater of claim 1, wherein: the conversion circuit comprises a fuse, a time-delay power-off functional unit and a power conversion unit, wherein the fuse is coupled between the power supply end and a control switch arranged on the shell, the control switch is coupled with the time-delay power-off functional unit, and the power conversion unit is coupled between the time-delay power-off functional unit and the protection circuit;

the power conversion unit is used for converting alternating current voltage into low-voltage direct current voltage.

3. The metal heater of claim 2, wherein: the shell is provided with a main power supply indicating lamp, the main power supply indicating lamp is connected with the delayed power-off functional unit in parallel, and when the control switch is turned off, the main power supply indicating lamp is turned on.

4. The metal heater of claim 1, wherein: the protection circuit comprises an overcurrent protection unit, a time-delay electrifying functional unit and a relay, wherein the overcurrent protection unit is coupled between the conversion circuit and the time-delay electrifying functional unit, and the time-delay electrifying functional unit is coupled with the relay;

the relay is connected with the heating driving unit through an electrical parameter display instrument arranged on the shell;

the time-delay electrifying functional unit is used for preventing the conversion circuit from causing insufficient excitation of the heating driving unit when the conversion voltage is insufficient.

5. The metal heater of claim 1, wherein: the shell is provided with a display component, and the display component is coupled between the conversion circuit and the protection circuit.

6. The metal heater of claim 5, wherein: the display assembly comprises a low-voltage output indicator light and a cooling fan, and the low-voltage output indicator light is connected with the cooling fan in parallel.

7. The metal heater of claim 4, wherein: the shell is provided with a driving power supply indicator light, and the driving power supply indicator light is coupled between the electrical parameter display instrument and the heating driving unit.

8. The metal heater of claim 1, wherein: install heating coil a plurality of louvres have been seted up to one side of casing, it is a plurality of the louvre all with hold the chamber intercommunication.

9. The metal heater of claim 1, wherein: the top end of the shell is provided with a mounting hole, the mounting hole is communicated with the accommodating cavity, and the mounting hole is used for mounting or dismounting the heating coil.

10. The metal heater of claim 9, wherein: the mounting hole upper cover is equipped with the apron, the apron pass through connecting bolt with the casing is connected, the apron can be relative the casing rotates, so that the mounting hole exposes.

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