CN213179409U

CN213179409U - Intermediate frequency furnace

Info

Publication number: CN213179409U
Application number: CN202021621454.8U
Authority: CN
Inventors: 于立明; 张志伟; 程子龙; 刘玉红
Original assignee: Xingtai Delong Machinery & Mill Roll Co ltd
Current assignee: Xingtai Delong Machinery & Mill Roll Co ltd
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2021-05-11
Anticipated expiration: 2030-08-06

Abstract

The utility model relates to an intermediate frequency furnace, it includes the frame, rotates and locates the furnace body in the frame, locates the crucible in the furnace body to and dust collecting unit and slagging-off unit, corresponding to the export, are equipped with the filter residue net on the outer wall of furnace body, and outside the export was covered to the filter residue net, one side that its top is close to the furnace body was constructed and is had the row's cinder notch, and the filter residue net face was constructed to one side of export and is just setting up, protruding water conservancy diversion to furnace body one side. The utility model discloses an intermediate frequency furnace, through set up the filter residue net that arranges corresponding to the export on the outer wall of furnace body, can filter the molten iron when empting the molten iron, thus can prevent the slag from flowing out with the molten iron effectively; in addition, through setting up lead screw motor and slagging-off piece, the removal of accessible slagging-off piece in the crucible strikes off the slag on the crucible inner wall, not only can improve cleaning efficiency, simultaneously, also can effectively reduce intensity of labour.

Description

Intermediate frequency furnace

Technical Field

The utility model relates to a metal melting equipment technical field, in particular to intermediate frequency furnace.

Background

The intermediate frequency furnace is a power supply device for converting power frequency 50HZ alternating current into intermediate frequency (more than 300HZ to 1000HZ), converts three-phase power frequency alternating current into direct current after rectification, converts the direct current into adjustable intermediate frequency current, supplies the intermediate frequency alternating current flowing through a capacitor and an induction coil, generates high-density magnetic lines in the induction coil, cuts metal materials contained in the induction coil, and generates large eddy current in the metal materials.

When the existing intermediate frequency furnace melts metal, melted high-temperature molten iron is continuously contacted with a furnace wall, a furnace lining is sometimes burnt and forms slag to float on the molten iron liquid level, and the existing intermediate frequency furnace cannot effectively remove the slag, so that the quality of a cast is influenced after the slag is poured into the cast along with the molten iron. In addition, because the molten liquid can condense on the inner wall of the crucible, the slag is usually removed by manual stirring nowadays, the efficiency is low, and the labor intensity is greatly increased.

In addition, current dust collecting device for intermediate frequency furnace is when the furnace body upset is in order to empty the molten iron, because the change of furnace body position, can not effectively collect the dust of furnace body, leads to the dust to spread in the factory building, has serious harm to staff's health.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to an intermediate frequency furnace, which can effectively prevent slag from flowing out along with molten iron, effectively collect dust generated by the furnace body, facilitate cleaning of melt condensed on the inner wall of the crucible, and effectively reduce labor intensity.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

an intermediate frequency furnace comprising:

a frame;

the furnace body is rotatably arranged on the rack, a rotating motor for driving the furnace body to rotate relative to the rack is arranged on the rack, a containing cavity is formed inside the furnace body, a furnace opening communicated with the containing cavity is formed in the top of the furnace body, a shell is sleeved outside the furnace body, a heat storage cavity is formed between the shell and the furnace body in a surrounding mode, a plurality of heat conducting fins protruding into the heat storage cavity are arranged on the outer wall of the furnace body, and cooling pipes with two ends respectively connected with a cold water tank and a hot water tank are wound outside the shell;

the crucible is arranged in the accommodating cavity, an outlet which extends to the furnace body along the radial direction of the crucible is formed at the top end of the crucible, a filter residue net is arranged on the outer wall of the furnace body corresponding to the outlet, the filter residue net covers the outlet, a slag discharge port is formed at one side of the top of the filter residue net close to the furnace body, and a flow guide bulge which is arranged right opposite to the outlet and protrudes towards one side of the furnace body is formed at one side of the filter residue net facing the outlet;

the dust collection unit comprises a fan arranged on the frame, a dust collection box connected to one end of the fan, and an annular air pipe connected to the other end of the fan through a connecting pipe, the connecting pipe comprises two hard pipes of which two ends are respectively connected with the fan and the annular air pipe, and a hose connected between the two hard pipes, the annular air pipe is arranged on the furnace body in an annular mode, and the furnace mouth is provided with a notch corresponding to the outlet;

slag removal unit, including locating in the frame, and be located the lead screw motor of fire door top, and locate swivel nut on lead screw motor's the lead screw, and in swivel nut overcoat be equipped with the adaptation in the slagging-off piece that the crucible set up, just the slagging-off piece covers the main part that is equipped with the brush hair including the outer peripheral face, and to the installation pipe that main part one side extended the setting, just the installation pipe with the connection can be dismantled to the swivel nut.

Furthermore, be equipped with the installation piece that inside cavity set up on the outer wall of installation pipe, and in slidable ground inserts on the installation piece and is equipped with the edge the spliced pole of radially arranging of installation pipe, in the spliced pole is constructed to keep off the ring of arranging along its radial evagination, and in the cover is equipped with elasticity butt on the spliced pole in keep off the ring with spring between the installation piece, and corresponding to the spring, in construct on the outer peripheral face of swivel nut can with the spliced pole is pegged graft continuous connecting hole.

Furthermore, the filter residue net is detachably connected to the furnace body.

Further, encircle the edge of filter residue net has set firmly the mounting panel, and in be constructed the ring on the mounting panel the edge of filter residue net and the turn-ups of outwards buckling, corresponding to the turn-ups, in be constructed the slot on the outer wall of furnace body, the turn-ups insert locate in the slot, and constitute filter residue net with can dismantle between the furnace body and be connected.

Furthermore, the annular air pipe is detachably arranged on the furnace body, a plurality of dust suction ports are arranged on the annular air pipe at intervals, and filter screens which are arranged in one-to-one correspondence with the dust suction ports are arranged on the annular air pipe.

Furthermore, the top of the furnace body is provided with a mounting seat which is arranged around the furnace mouth, a plurality of jacks which are uniformly distributed along the circumferential direction of the mounting seat are constructed on the mounting seat, clamping holes are constructed at the edges of the jacks, the area of each clamping hole is smaller than that of each jack, a clamping block is constructed at the bottom of the annular air pipe corresponding to each clamping hole, the clamping block can penetrate through the mounting seat through the jacks, and the clamping block slides into the clamping holes from the jacks due to the rotation of the annular air pipe and is clamped on the mounting seat.

Further, the bottom of the crucible is configured to be an inverted cone shape, and the bottom of the main body is conformal with the crucible.

Compared with the prior art, the utility model discloses following advantage has:

(1) the intermediate frequency furnace of the utility model can filter molten iron when pouring molten iron by arranging the filter residue net corresponding to the outlet on the outer wall of the furnace body, thereby effectively preventing molten iron from flowing out by slag; in addition, through setting up lead screw motor and slagging-off piece, the removal of accessible slagging-off piece in the crucible strikes off the slag on the crucible inner wall, not only can improve cleaning efficiency, simultaneously, also can effectively reduce intensity of labour. In addition, the hose is connected between the two hard pipes, so that the annular air pipe can be allowed to follow the turnover of the furnace body, the dust collecting effect on the furnace body can be effectively improved, and dust can be effectively prevented from being scattered in the external environment.

(2) The filter residue net can be detachably connected to the furnace body, and can be detached, so that slag in the filter residue net can be conveniently cleaned.

(3) The detachable connection of the filter residue net on the furnace body is realized through the plug-in connection of the flanging and the inserting grooves, the structure is simple, and the design and implementation are convenient.

(4) The annular air pipe is detachably arranged on the furnace body, and the annular air pipe can be conveniently detached to clean the furnace body.

(5) The installation of the annular air pipe on the furnace body is realized by rotating the annular air pipe, so that the annular air pipe can be conveniently detached.

(6) The air outlet of the air cooler is provided with the conical air guide cover, so that the uniformity of air cooling of the air cooler on each radiating pipe is improved.

(7) Through establishing the installation pipe into can dismantle with the swivel nut and be connected, can dismantle the slagging-off unit when not using to can effectively avoid the slagging-off piece to be in under the high temperature environment all the time, and then can prolong the life of slagging-off piece.

(8) Through set up the spring on the spliced pole, accessible compression spring realizes deviating from in the spliced pole by the connecting hole, also can be under the restoring force of spring simultaneously for the spliced pole is inserted and is located in the connecting hole, and easy operation, and the dismouting of slagging-off piece on the swivel nut of can being convenient for.

(9) The bottom of the crucible is formed into an inverted cone shape, so that slag can be concentrated on the bottom, and the slag can be cleaned conveniently.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of an intermediate frequency furnace according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an intermediate frequency furnace according to an embodiment of the present invention at another viewing angle;

fig. 3 is a front view of an intermediate frequency furnace according to an embodiment of the present invention;

fig. 4 is a top view of an intermediate frequency furnace according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of an intermediate frequency furnace according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a mounting seat according to an embodiment of the present invention;

fig. 7 is a schematic structural view of the mounting base according to the embodiment of the present invention at another viewing angle;

fig. 8 is a connection state diagram between the installation tube and the screw sleeve according to the embodiment of the present invention;

fig. 9 is a schematic structural view of a cooling portion according to an embodiment of the present invention;

fig. 10 is a schematic structural view of a heat dissipating pipe according to an embodiment of the present invention;

description of reference numerals:

1-a rack, 2-a fan, 3-a connecting pipe, 4-an annular air pipe, 5-a deslagging piece, 6-a screw motor, 7-a filter screen, 8-a furnace body, 9-a rotating motor, 10-an installation pipe, 11-a shell, 12-a heat storage cavity, 13-a heat conducting fin, 14-an isolation cylinder, 15-an induction coil, 16-a crucible, 17-an upper installation plate, 18-a lower installation plate, 19-a connecting column, 20-a spring, 21-an installation block, 22-a screw sleeve, 23-an air cooler, 24-a wet curtain, 25-a heat dissipation pipe and 26-an air guide cover;

801-outlet, 1701-jack, 1702-clamp hole, 1801-through hole, 1901-baffle ring and 2201-connecting hole;

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment relates to an intermediate frequency furnace, which comprises a frame 1, a furnace body 8 rotatably arranged on the frame 1, a crucible 16 arranged in the furnace body 8, a cooling unit for cooling the furnace body 8, and a dust collecting unit for collecting dust generated by the furnace body 8. In addition, in order to remove the melt condensed on the inner wall of the crucible 16, a slag removing unit for removing slag is provided in this embodiment.

Specifically, as shown in fig. 1 to 5, the furnace body 8 is disposed in the middle of the frame 1, a rotating motor 9 is disposed on one side of the frame 1 for driving the furnace body 8 to rotate relative to the frame 1, a supporting seat is disposed on the other side of the frame 1 relative to the rotating motor 9, and a bearing for rotatably supporting the furnace body 8 is disposed in the supporting seat. In addition, as shown in fig. 1 in conjunction with fig. 5, an accommodating chamber is formed inside the furnace body 8, and a furnace opening communicating with the accommodating chamber is formed at the top thereof. In addition, a casing 11 is sleeved outside the furnace body 8, a heat storage cavity 12 is formed between the casing 11 and the furnace body 8, and a plurality of heat conducting fins 13 protruding into the heat storage cavity 12 are arranged on the outer wall of the furnace body 8.

Through setting up heat accumulation chamber 12, can make the heat of furnace body 8 save in heat accumulation chamber 12, can effectively avoid following cooling tube direct and furnace body 8 contact and shorten the life of cooling tube. In addition, the heat conducting fins 13 are provided to facilitate the transfer of heat in the furnace body 8 to the heat storage chamber 12.

Still as shown in fig. 5, the crucible 16 of the present embodiment is disposed in the containing cavity, an induction coil 15 for heating the crucible 16 is wound outside the crucible 16, an isolation cylinder 14 is sleeved outside the induction coil 15, and quartz sand is filled between the isolation cylinder 14 and the furnace body 8. And the bottom of the crucible 16 of this embodiment is configured in an inverted cone shape for easy cleaning of slag. In addition, as shown in fig. 1 and 2, an outlet 801 extending to the furnace body 8 along the radial direction thereof is formed at the top end of the crucible 16, and a strainer 7 is provided on the outer wall of the furnace body 8 corresponding to the outlet 801, and the strainer 7 is made of a conventional high temperature-resistant strainer.

As shown in fig. 1, the residue filtering net 7 covers the outlet 801, a residue discharge port is formed at one side of the top of the residue filtering net 7 close to the furnace body 8, and a flow guide protrusion which is arranged right opposite to the outlet 801 and protrudes towards one side of the furnace body 8 is formed at one side of the residue filtering net 7 facing the outlet 801. So set up, can guide the slag to flow to the bottom of dregs net 7 when empting the molten iron to can effectively prevent that the slag from shutoff dregs net 7 and influencing the outflow of molten iron.

Furthermore, in order to facilitate cleaning of the slag in the strainer 7, the strainer 7 of this embodiment is arranged to be detachably connected to the furnace body 8. In a concrete structure, a fixing plate is fixedly arranged at the edge of the annular filter residue net 7, and a flanging which is bent outwards at the edge of the annular filter residue net 7 is constructed on the fixing plate. And corresponding to the flanging, a slot not shown in the figure is formed on the outer wall of the furnace body 8, and the flanging is inserted in the slot to form detachable connection between the filter residue net 7 and the furnace body 8. Here, it should be noted that, in addition to cleaning the slag by detaching the strainer 7, the slag may be cleaned out through the slag discharge port by an external tool in pouring the molten iron.

As shown in fig. 1 and 2, the dust collecting unit of the present embodiment includes a blower 2 provided on a frame 1, a dust box, not shown, connected to one end of the blower 2, and an annular duct 4 connected to the other end of the blower 2 via a connection pipe 3. And, for realizing that annular tuber pipe 4 can follow up in the upset of furnace body 8 to improve the collection dirt effect to furnace body 8, connecting pipe 3 of this embodiment includes two hard tubes that both ends are connected with fan 2 and annular tuber pipe 4 respectively to and connect the hose between two hard tubes, this hose specifically adopts current high temperature resistance tuber pipe to make.

As shown in fig. 1, the annular duct 4 of this embodiment is detachably provided to the furnace body 8 so that the inside of the annular inner duct can be cleaned periodically. Specifically, the top of the furnace body 8 is provided with a mounting seat with a ring furnace mouth, and the ring-shaped air pipe 4 is detachably arranged on the mounting seat. In consideration of the installation effect and dust collection effect of the circular air duct 4, the mounting seat of the present embodiment is specifically composed of an upper mounting plate 17 and a lower mounting plate 18 which are vertically fixed together, the outer diameters of the upper mounting plate 17 and the lower mounting plate 18 are the same as the outer diameter of the housing 11, and the outlet 801 extends to the upper mounting plate 17.

To facilitate the detachable connection of the annular duct 4 to the mounting seat, as shown in fig. 6 and 7, a plurality of insertion holes 1701 are formed in the upper mounting plate 17 so as to be evenly distributed along the circumferential direction thereof, and at the edges of the insertion holes 1701, click holes 1702 are formed, and the area of the click holes 1702 is smaller than that of the insertion holes 1701. In addition, through holes 1801 are formed in the lower mounting board 18 corresponding to the insertion holes 1701 and the card holes 1702. As shown in fig. 1 and fig. 2, the annular air duct 4 of the present embodiment is provided with a furnace opening on the furnace body 8, and has a notch corresponding to the outlet 801, and a plurality of dust suction openings are arranged on the annular air duct 4 at intervals, and the annular air duct 4 is provided with filter screens arranged corresponding to the dust suction openings one by one.

In addition, a clamping block is formed at the bottom of the annular air duct 4, and the clamping block can pass through the upper mounting plate 17 through the insertion hole 1701, and by applying a rotating external force on the annular air duct 4, the clamping block can slide into the clamping hole 1702 through the insertion hole 1701 due to the self-rotation of the annular air duct 4 and be clamped on the upper mounting plate 17, so that the installation of the annular air duct 4 on the mounting seat is realized. When the annular air pipe 4 is pre-disassembled, the annular air pipe 4 is rotated reversely, and the fixture blocks are aligned with the insertion holes 1701, so that the annular air pipe 4 can be disassembled from the mounting seat.

As shown in fig. 1 and fig. 2 in combination with fig. 5, the slag removing unit of the present embodiment includes a screw motor 6 disposed on the frame 1 and above the furnace opening, and a threaded sleeve 22 disposed on the screw of the screw motor 6, and a slag removing member 5 adapted to the crucible 16 is disposed around the threaded sleeve 22. The deslagging part 5 comprises a main body with bristles covered on the peripheral surface and a mounting pipe 10 extending towards one side of the main body. And the outer diameter of the body is the same as the inner diameter of the crucible 16 and may be slightly smaller to facilitate movement within the body crucible 16. In addition, the bottom of the main body is arranged with the crucible 16, the installation tube 10 is detachably connected with the threaded sleeve 22, and bristles can be adopted.

Structurally, as shown in fig. 8, an installation block 21 having a hollow interior is disposed on an outer wall of the installation tube 10, and a connection column 19 disposed along a radial direction of the installation tube 10 is slidably inserted into the installation block 21. In addition, a retaining ring 1901 protruding outward along the radial direction is configured on the connecting column 19, and a retaining block is disposed at one end of the connecting column 19 exposed to the mounting block 21 to abut against the mounting block 21. In addition, a spring 20 elastically abutting between the stopper ring 1901 and the mounting block 21 is sleeved on the connecting column 19, and a connecting hole 2201 capable of being connected with the connecting column 19 in an inserting manner is formed on the outer peripheral surface of the threaded sleeve 22 corresponding to the spring 20.

With the arrangement, when the slag removing piece 5 is installed, the installation pipe 10 is firstly sleeved on the screw rod, the stop block is pulled when the slag removing piece is close to the threaded sleeve 22 in advance, the connecting column 19 compresses the spring 20, so that the connecting column 19 is not interfered with the threaded sleeve 22, and when the connecting column 19 is aligned with the connecting hole 2201, the connecting column 19 is released, so that the connecting column 19 can be inserted into the connecting hole 2201 under the restoring force of the spring 20. And for improving the connection effect, the installation block 21 and the connection column 19 of this embodiment are two arranged on the installation tube 10 relatively, at this moment, in order to facilitate the detachment and installation of the deslagging piece 5, a chute is constructed on the installation block 21, corresponding to the chute, and a sliding block which can be slidably arranged in the chute is constructed on the connection column 19.

Therefore, before the slag removing piece 5 is installed, the connecting column 19 can be rotated after the sliding block is separated from the sliding groove by pulling the stop block, so that the sliding block is clamped on one side of the installing block 21, the compression state of the spring 20 can be kept, the connecting column 19 does not interfere with the thread insert, the installing pipe 10 is sleeved on the lead screw, and the connecting column 19 does not need to be pulled all the time. Then, when the connecting column 19 is aligned with the connecting hole 2201, the connecting column 19 is rotated to the slide block alignment sliding groove, and then the connecting column 19 is released, so that the connecting column 19 can be inserted into the connecting hole 2201. In addition, in order to facilitate the alignment of the connection column 19 and the connection hole 2201, the distance between the connection column 19 and the end of the installation tube 10 may be made to be the same as the distance between the connection hole 2201 and the end of the threaded sleeve 22, and indication lines arranged correspondingly may be provided on the installation tube 10 and the threaded sleeve 22.

In this embodiment, the slag removing member 5 is detachably mounted on the threaded sleeve 22, so that the slag removing member 5 can be detached when not in use, thereby preventing the bristles from being degraded in use effect due to high temperature near the furnace body 8. In addition, the length of the mounting tube 10 can be allowed to be long, so that the length of the lead screw can be shortened, and the cost can be reduced. In addition, in order to prevent the height of the screw motor 6 from being high due to the long length of the screw, the screw motor 6 of the present embodiment may specifically adopt a through-type screw motor 6. In this embodiment, when carrying out the slagging-off operation, accessible lead screw motor 6 drives the removal of slagging-off piece 5 in crucible 16 and the slag on the clearance crucible 6 inner wall, then overturn furnace body 8 again with the slag pour out can, not only can improve the slagging-off efficiency, also greatly reduced intensity of labour simultaneously.

In addition, in order to enhance the cooling effect on the furnace body 8, a cooling pipe having both ends connected to the cold water tank and the hot water tank is wound around the outside of the case 11, and a cooling portion is connected between the hot water tank and the cold water tank. As shown in fig. 9, the cooling portion of the present embodiment includes an air cooler 23, a wet curtain 24 located on one side of the air cooler 23, and a plurality of radiating pipes 25 arranged at intervals and connected in sequence on the other side of the wet curtain 24 relative to the air cooler 23. The cold water tank and the hot water tank of the present embodiment are respectively connected with the two radiating pipes 25 located at both sides via pipes in a one-to-one correspondence manner, so that the water flow in the hot water tank is radiated after passing through the radiating pipes 25, and the temperature is reduced.

In addition, the pure water preparation machine is connected with the cold water tank through a pipeline, and a water pump and a valve are arranged on the pipeline so as to periodically open the water pump and the valve to supplement water into the cold water tank. In addition, in order to further improve the heat dissipation effect, as shown in fig. 10, each heat dissipation tube 25 of the present embodiment is shaped like a sheet, and a U-shaped channel is configured in the heat dissipation tube 25, so that the heat dissipation area of the water flow can be increased, and the heat dissipation path of the water flow can be extended, thereby improving the heat dissipation effect of the water flow. In fig. 10, the directions of the dotted lines and arrows are the flow paths and the flow directions of the water flowing in the radiating pipe 25.

Based on the above overall description, in the intermediate frequency furnace of the present embodiment, by providing the strainer 7 disposed corresponding to the outlet 801 on the outer wall of the furnace body 8, molten iron can be filtered when the molten iron is poured, so that the molten iron can be effectively prevented from flowing out by the slag. In addition, through setting up lead screw motor 6 and slagging-off piece 5, the removal of accessible slagging-off piece 5 in crucible 16, and strike off the slag on the crucible 16 inner wall, not only can improve cleaning efficiency, simultaneously, also can effectively reduce intensity of labour. In addition, the hose is connected between the two hard pipes, so that the annular air pipe 4 can be allowed to follow the turnover of the furnace body 8, the dust collection effect on the furnace body 8 can be effectively improved, and dust can be effectively prevented from being scattered in the external environment.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An intermediate frequency furnace, comprising:

a frame (1);

the furnace body (8) is rotatably arranged on the rack (1), a rotating motor (9) for driving the furnace body (8) to rotate relative to the rack (1) is arranged on the rack (1), a containing cavity is formed inside the furnace body (8), a furnace opening communicated with the containing cavity is formed in the top of the furnace body, a shell (11) is sleeved outside the furnace body (8), a heat storage cavity (12) is formed between the shell (11) and the furnace body (8) in a surrounding mode, a plurality of heat conducting fins (13) protruding into the heat storage cavity (12) are arranged on the outer wall of the furnace body (8), and cooling pipes with two ends respectively connected with a cold water tank and a hot water tank are wound outside the shell (11);

the crucible (16) is arranged in the accommodating cavity, an outlet (801) extending to the furnace body (8) along the radial direction of the crucible is formed at the top end of the crucible (16), a filter residue net (7) is arranged on the outer wall of the furnace body (8) corresponding to the outlet (801), the filter residue net (7) covers the outlet (801), a residue discharge port is formed at one side of the top of the filter residue net (7) close to the furnace body (8), and a flow guide bulge which is arranged right opposite to the outlet (801) and protrudes towards one side of the furnace body (8) is formed at one side of the filter residue net (7) facing the outlet (801);

the dust collection unit comprises a fan (2) arranged on the rack (1), a dust collection box connected to one end of the fan (2), and an annular air pipe (4) connected to the other end of the fan (2) through a connecting pipe (3), the connecting pipe (3) comprises two hard pipes of which two ends are respectively connected with the fan (2) and the annular air pipe (4), and a hose connected between the two hard pipes, the annular air pipe (4) is arranged on the furnace body (8) in a manner of surrounding the furnace mouth, and is provided with a notch arranged corresponding to the outlet (801);

slag removal unit, slag removal unit is including locating on frame (1) and be located screw motor (6) of fire door top, and locate swivel nut (22) on the lead screw of screw motor (6), and in swivel nut (22) overcoat be equipped with the adaptation in slag removal spare (5) that crucible (16) set up, just slag removal spare (5) cover the main part that is equipped with the brush hair including the outer peripheral face, and to installation pipe (10) that main part one side extended the setting, just installation pipe (10) with the connection can be dismantled to swivel nut (22).

2. The intermediate frequency furnace of claim 1, wherein: an installation block (21) with a hollow inner part is arranged on the outer wall of the installation pipe (10), and a connecting column (19) arranged along the radial direction of the installation pipe (10) is slidably inserted into the installation block (21); a blocking ring (1901) which is arranged along the radial direction in a protruding mode is constructed on the connecting column (19), a spring (20) which is elastically abutted between the blocking ring (1901) and the mounting block (21) is sleeved on the connecting column (19), a connecting hole (2201) which can be connected with the connecting column (19) in an inserting mode is constructed on the outer peripheral face of the threaded sleeve (22) corresponding to the spring (20).

3. The intermediate frequency furnace of claim 1, wherein: the filter residue net (7) is detachably connected to the furnace body (8).

4. The intermediate frequency furnace of claim 3, wherein: the ring the edge of filter residue net (7) has set firmly the fixed plate, and in construct the ring on the fixed plate the edge of filter residue net (7) and the turn-ups of outwards buckling, corresponding to the turn-ups, in the slot has been constructed on the outer wall of furnace body (8), the turn-ups is inserted and is located in the slot, and constitute filter residue net (7) with the dismantlement between furnace body (8) is connected.

5. The intermediate frequency furnace according to any one of claims 1 to 4, characterized in that: the annular air pipe (4) is detachably arranged on the furnace body (8), a plurality of dust suction ports are arranged on the annular air pipe (4) at intervals, and filter screens which are arranged in one-to-one correspondence with the dust suction ports are arranged on the annular air pipe (4).

6. The intermediate frequency furnace of claim 5, wherein: the top of the furnace body (8) is provided with a mounting seat with a ring arranged at the furnace mouth, a plurality of insertion holes (1701) are uniformly distributed along the circumferential direction of the mounting seat, clamping holes (1702) are formed in the edges of the insertion holes (1701), the area of each clamping hole (1702) is smaller than that of the corresponding insertion hole (1701), a clamping block is formed at the bottom of the annular air pipe (4) corresponding to each clamping hole (1702), the clamping block can penetrate through the mounting seat through the insertion holes (1701), and the clamping block can slide into the clamping holes (1702) from the insertion holes (1701) due to the rotation of the annular air pipe (4) and is clamped on the mounting seat.

7. The intermediate frequency furnace of claim 1, wherein: the bottom of the crucible (16) is configured to be an inverted cone, and the bottom of the body is conformal with the crucible (16).