CN113621771B - Multifunctional roller hearth furnace - Google Patents

Multifunctional roller hearth furnace Download PDF

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Publication number
CN113621771B
CN113621771B CN202110930156.XA CN202110930156A CN113621771B CN 113621771 B CN113621771 B CN 113621771B CN 202110930156 A CN202110930156 A CN 202110930156A CN 113621771 B CN113621771 B CN 113621771B
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furnace body
quenching
heating
furnace
cylinder
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CN113621771A (en
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钱洁明
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Shengzhou Yinkang Machinery Co ltd
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Shengzhou Yinkang Machinery Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/562—Details
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/60—Continuous furnaces for strip or wire with induction heating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The invention relates to the technical field of roller hearth furnaces. The purpose is to provide a multifunctional roller hearth furnace, which comprises a furnace body, wherein a plurality of conveying rollers extending along the width direction of the furnace body are arranged in the furnace body side by side along the length direction of the furnace body; the inside of the furnace body is sequentially divided into a heating zone, a forming zone and a quenching zone along the length direction of the furnace body, and a heating device, a thermoforming device and a quenching device are further arranged in the heating zone, the forming zone and the quenching zone; the heating device comprises a flat square cylindrical heating cylinder, a plurality of inverted U-shaped first abdication openings matched with the conveying rollers are arranged at intervals on the upper part of the heating cylinder, and the conveying rollers are positioned in the first abdication openings; an electromagnetic heating coil is arranged on the inner wall of the heating cylinder. The invention can complete the working procedures of heating, forming and quenching of the workpiece at one time, thereby greatly improving the processing efficiency.

Description

Multifunctional roller hearth furnace
Technical Field
The invention relates to the technical field of roller hearth furnaces, in particular to a multifunctional roller hearth furnace.
Background
The roller hearth furnace is a generic name of a series of self-conveying furnace bodies, and by installing conveying rollers in the furnace bodies, workpieces are automatically conveyed in the furnace bodies, and processing procedures such as heating, annealing, quenching and the like are completed in the conveying process, so that the assembly line processing of the workpieces in the furnace is realized. However, in the use process of the roller hearth furnace, the following problems are required to be solved due to the natural defects of the structure:
1. the traditional roller hearth furnace has single function, namely an independent hot forming roller hearth furnace or an independent quenching roller hearth furnace, and workpieces do not finish a process, and are transferred between different devices, so that the overall processing efficiency is affected.
2. The traditional roller hearth furnace does not have a continuous conveying and forming function, namely, the workpiece cannot be naturally bent and formed in the conveying process, but is required to be bent and pressed by a punching machine, a pressing machine and the like after conveying is stopped, and the production and processing efficiency is greatly influenced.
3. The conveying roller of the roller hearth furnace is positioned outside the furnace body due to the power coupling end, the conveying section is positioned in the furnace body, and part of heat is inevitably transmitted to the outside of the furnace body through the conveying roller, so that the heat loss of the furnace body is caused, and the heat energy efficiency of the furnace body is affected. Meanwhile, heat in the furnace body overflows from the mounting seam of the power coupling end of the conveying roller on the furnace body, and although sealing is improved in some ways in the prior art, the overall effect is poor, and the heat efficiency is affected.
Disclosure of Invention
The invention aims to provide a multifunctional roller hearth furnace with compact and reasonable layout.
In order to achieve the aim of the invention, the invention adopts the following technical scheme: a multifunctional roller hearth furnace comprises a furnace body, wherein a plurality of conveying rollers extending along the width direction of the furnace body are arranged in the furnace body side by side along the length direction of the furnace body;
the inside of the furnace body is sequentially divided into a heating zone, a forming zone and a quenching zone along the length direction of the furnace body, and a heating device, a thermoforming device and a quenching device are further arranged in the heating zone, the forming zone and the quenching zone;
the heating device comprises a flat square cylindrical heating cylinder, a plurality of inverted U-shaped first abdication openings matched with the conveying rollers are arranged at intervals on the upper part of the heating cylinder, and the conveying rollers are positioned in the first abdication openings; an electromagnetic heating coil is arranged on the inner wall of the heating cylinder.
Preferably, two rows of first supporting feet are symmetrically arranged on two sides of the lower part of the heating cylinder, and the first supporting feet are fixedly connected with a first supporting seat arranged at the bottom of the furnace body.
Preferably, the quenching device comprises a quenching cylinder which is in a flat square cylinder shape, wherein a plurality of inverted U-shaped second abdication openings matched with the conveying rollers are arranged at intervals on the upper part of the quenching cylinder, and the conveying rollers are positioned in the second abdication openings; the inner surfaces of the top and the bottom of the quenching cylinder are respectively provided with a plurality of quenching nozzles.
Preferably, the upper part of the quenching cylinder is provided with a gas collecting cover, the gas collecting cover is communicated with one end of the exhaust pipe, and the other end of the exhaust pipe extends out of the furnace body.
Preferably, two water collecting tanks extending along the length direction of the quenching cylinder are arranged on the left side and the right side of the lower portion of the quenching cylinder, the water collecting tanks are communicated with the quenching cylinder through overflow holes, and the water collecting tanks are communicated with the water collecting tank through connecting pipes.
Preferably, two rows of second supporting feet are symmetrically arranged on two sides of the lower part of the quenching cylinder, and the second supporting feet are fixedly connected with a second supporting seat arranged at the bottom of the furnace body.
Preferably, the conveying roller comprises a hollow roller shaft, two ends of the hollow roller shaft are connected with the inner ends of ceramic heat insulation cups, the outer ends of the ceramic heat insulation cups are connected with shaft rods, the shaft rods penetrate through the side wall of the furnace body and are arranged on bearing seats on the outer surface of the furnace body through bearings, and driving wheels are arranged at the outer ends of the shaft rods;
the ceramic heat-insulating cup comprises a conical hollow cone, a connector is embedded in the inner cavity of the hollow cone, and the outer diameter of one end, close to the hollow roll shaft, of the connector is matched with the inner diameter of the hollow roll shaft; shoulder tables are arranged at two ends of the hollow roll shaft, and first key teeth are arranged on the outer peripheral surface of the shoulder tables; a groove matched with the shoulder is formed in the inner end face of the hollow cone of the ceramic heat insulation cup, and second key teeth are formed in the inner side wall of the groove; the hollow roller is sleeved on the connecting head, the shoulder stretches into the groove, and the first key teeth and the second key teeth are meshed with each other; the outer end of the hollow cone is fixedly connected with the shaft lever.
Preferably, the furnace wall of the furnace body is composed of two layers of steel plates, and an air heat insulation layer is formed between the two layers of steel plates.
Preferably, an annular mounting cavity taking the shaft rod as the center is formed in the furnace wall at the mounting position of the shaft rod, two Feng Pan sealing discs are fixedly arranged in the mounting cavity, the edges of the sealing discs are fixedly arranged on the inner side wall of the mounting cavity, and a high-pressure sealing chamber is formed between the two sealing discs; the center of the sealing disc is provided with a pump sleeve, and the pump sleeve is sleeved outside the shaft rod and forms clearance fit with the shaft rod; the inner side wall of the pump sleeve is provided with a threaded pump tooth, and the pumping direction of the threaded pump tooth faces the high-pressure sealing chamber; and the side wall of the mounting cavity is also provided with an air inlet pipe, and the inner end of the air inlet pipe is communicated with the high-pressure sealing chamber.
The beneficial effects of the invention are concentrated in that: the working procedures of heating, forming and quenching the workpiece can be completed at one time, and the processing efficiency is greatly improved. Specifically, the invention sets heating, forming and quenching on the same roller hearth furnace line, realizes continuous processing of the band plate, and greatly improves the efficiency; the electromagnetic heating coil is adopted to heat the band plate, so that the pollution is small, the workshop environment is purified, and meanwhile, the high-efficiency intelligent control of the temperature is convenient; the special shape design of the heating cylinder and the quenching cylinder ensures that the overall layout of the invention is more reasonable and compact.
Drawings
FIG. 1 is a schematic view of the structure of a furnace body of the present invention;
FIG. 2 is a schematic diagram of the internal structure of the furnace body corresponding to the heating zone;
FIG. 3 is a schematic view of a heating cartridge;
FIG. 4 is a schematic diagram of the internal structure of the furnace body corresponding to the quenching zone;
FIG. 5 is a schematic view of the internal structure of the furnace body corresponding to the forming zone;
FIG. 6 is an enlarged view of portion A of FIG. 5;
fig. 7 is an enlarged view of a portion B in fig. 5.
Detailed Description
The roller hearth furnace shown in combination with fig. 1-7 comprises a furnace body 1, and is the same as the traditional roller hearth furnace in that a plurality of conveying rollers 2 extending along the width direction of the furnace body 1 are arranged in the furnace body 1 side by side along the length direction of the furnace body 1, and the conveying rollers 2 are used for conveying band plate workpieces, namely band plate workpieces. In general, the form of carrying can be directly adopted, and the form of clamping can also be adopted under part of requirements, and the carrying is mainly taken as an example for illustration.
In order to realize one-time processing and forming of the band plate, the invention integrates multiple functions of heating and heat preservation, bending and forming, quenching heat treatment and the like, and the band plate workpiece moves from left to right under the conveying action of the conveying roller 2 as shown in fig. 1, the furnace body 1 is sequentially divided into a heating zone 3, a forming zone 4 and a quenching zone 5 along the length direction of the furnace body 1, and a heating device, a thermoforming device and a quenching device are further arranged in the heating zone 3, the forming zone 4 and the quenching zone 5. As the name suggests, the heating device, the thermoforming device and the quenching device are used for heating, bending forming and quenching the workpiece respectively.
Different from the traditional heating mode, as shown in fig. 2 and 3, the heating device of the invention comprises a flat square cylindrical heating cylinder 6, two rows of first supporting feet are symmetrically arranged on two sides of the lower part of the heating cylinder 6, and the first supporting feet are fixedly connected with a first supporting seat arranged at the bottom of the furnace body 1. Of course, in the case of meeting the fixing requirement, the specific fixing manner of the heating cylinder 6 may be adjusted as required. The upper part of the heating cylinder 6 is provided with a plurality of inverted U-shaped first abdication openings 7 which are matched with the conveying rollers 2 at intervals, and the conveying rollers 2 are positioned in the first abdication openings 7. The main function of the first abdication opening 7 is to provide an abdication space for the installation of the conveying roller 2, avoid the occupation conflict with the conveying roller 2, and an electromagnetic heating coil 8 is arranged on the inner wall of the heating cylinder 6. The electromagnetic heating coil 8 is used for uniformly heating the workpiece up and down, and compared with a traditional roller hearth furnace. According to the continuous processing device, heating, forming and quenching are arranged on the same roller hearth furnace line, so that continuous processing of the band plate is realized, and the efficiency is greatly improved; the electromagnetic heating coil 8 is adopted to heat the band plate, so that the pollution is small, the workshop environment is purified, and meanwhile, the temperature is conveniently and intelligently controlled in an efficient manner.
In terms of thermoforming, the conventional roller hearth furnace adopts an intermittent processing mode, that is, the workpiece is conveyed to a forming device and conveyed to stop, and the workpiece is bent by a press machine, a plate bending machine and the like, but the mode is not suitable for continuous forming of strip-shaped plates and has low processing efficiency, and for this reason, the second difference of the invention is that: the thermoforming device comprises a plurality of groups of forming assemblies distributed along the length direction of the furnace body 1, the positions of the forming assemblies are opposite to gaps between the conveying rollers 2, mutual interference with the conveying rollers 2 is avoided, and the forming assemblies comprise forming press rollers and forming guide rollers. In other words, the thermoforming apparatus of the present invention is composed of several groups of forming press rolls and forming guide rolls arranged in the heating zone 4 along the length direction of the furnace body 1. The forming press roller is used for limiting the bending of the upper surface of the workpiece, and the forming guide roller is used for limiting the bending of the lower surface of the workpiece.
As shown in fig. 5, the forming press roll comprises a press roll body 18 and conical discs 19 arranged at two ends of the press roll body 18, wherein the press roll body 18 is fixedly connected with the top inner wall of the furnace body 1 through a press roll connecting frame. As shown in the figure, in order to ensure the installation strength of the forming press roller, the press roller connecting frame comprises an H-shaped frame 25, the lower end of the H-shaped frame 25 is fixedly connected with the press roller body 18 through two hoops, and the upper end of the H-shaped frame 25 is fixedly connected with a third supporting seat installed on the inner side wall at the top of the furnace body 1. The forming guide roller comprises a guide roller body 20 and a rotary roller 21 sleeved outside the guide roller body 20, the forming guide roller is obliquely arranged in pairs on two sides of the forming press roller, and the inclination angle is matched with the conical surface of the conical disc 19. The upper end of the guide roller body 20 is arranged on an upper roller seat 22 on the inner walls of the two sides of the upper part of the furnace body 1, the lower end of the guide roller body 20 is arranged on a lower roller seat 23 in the center of the lower part of the furnace body 1, and the lower roller seat 23 is fixedly connected with the inner walls of the two sides of the furnace body 1 through a guide roller connecting frame, as shown in the figure, the guide roller connecting frame is a transverse frame arranged at the lower part of the furnace body 1.
When forming operation, namely bending plate operation is carried out, the edges of the band plate workpiece are bent through cooperation of the conveying roller 2, the forming press roller and the forming guide roller. An inclined bent plate area 24 is formed between the rotary roller 21 and the conical surface of the conical disk 19, and the inclined angle of the bent plate area 24 of each forming assembly gradually increases along the conveying direction of the workpiece. In the conveying process, the workpiece is limited by the bending plate area 24, so that the edge of the workpiece is changed along with the inclination angle of the bending plate area 24, and the final forming is realized. In other words, the belt plate workpiece is pressed against the conveying roller 2 by the forming press roller and conveyed along the conveying roller 2, and during the conveying, the edge of the belt plate is gradually pressed and bent by the forming guide roller with the gradual increase of the angle of the bending plate area 24, and finally the belt plate is formed into a groove-shaped belt plate; compared with the traditional mode, the belt plate bending machine is gradually bent in the conveying process of the belt plate, a machine is not required to be stopped or a pressing part such as a press machine is not required to be used, the bending plate is completely formed by virtue of the guiding of the forming guide roller and the forming press roller, continuous non-stop production can be realized, and the machining efficiency is extremely high. And because the band plate workpiece is gradually bent at a high temperature, the internal stress is well released, the resilience is not easy to occur after the processing is finished, and the quality of the produced grooved band plate is stable.
The cone 19 and the rotary drum 21 of the present invention are mounted on the press roller body 18 and the guide roller body 20, respectively, and are rotatable. In order to further improve the self-rotation performance of the forming guide roller, the upper and lower ends of the guide roller body 20 are respectively in rotational connection with the upper roller seat 22 and the lower roller seat 23, so that the risk of clamping plates can be greatly reduced and the smoothness is improved by the free rotation of the rotary roller 21 on the guide roller body 20 and the free rotation of the guide roller body 20 on the upper and lower roller seats, and the double rotation is formed through communication.
The quenching device comprises a quenching cylinder 9 in a flat square cylinder shape, wherein a plurality of inverted U-shaped second yielding openings 10 matched with the conveying rollers 2 are arranged at intervals on the upper part of the quenching cylinder 9, and the conveying rollers 2 are positioned in the second yielding openings 10. The overall shape of the quenching drum 9 is similar to the heating drum 6, but it is not provided with electromagnetic heating coils 8, but the inner surfaces of the top and bottom of the quenching drum 9 are provided with a plurality of quenching nozzles 11, respectively. The quenching nozzle 11 can spray quenching liquid to perform quenching heat treatment on the high-temperature band plate, and it should be noted that the quenching nozzle 11 should be uniformly arranged and ensure a relatively complete spray area coverage on the workpiece.
In the quenching operation, a large amount of mist is generated, so that in order to avoid the influence of direct dissipation of the mist on the production environment, a certain collection treatment can be performed on the mist, as shown in fig. 4, a gas collecting cover 12 is arranged at the upper part of the quenching cylinder 9, the gas collecting cover 12 is communicated with one end of an exhaust pipe 13, and the other end of the exhaust pipe 13 extends out of the furnace body 1. The mist is collected through the gas return cover 12, and the mist is conveyed through the exhaust pipe 13, so that the external exhaust is finally realized, and the exhaust pipe 13 can be externally connected and connected with a workshop smoke exhaust system, so that the device can be flexibly designed according to actual conditions by a person skilled in the art, and redundant description is omitted.
Of course, in the quenching process, there is a residual part of the quenching liquid, in order to collect the quenching liquid, two water collecting tanks 14 extending along the length direction of the quenching drum 9 are disposed at the left and right sides of the lower part of the quenching drum 9, the water collecting tanks 14 are communicated with the quenching drum 9 through an overflow hole 15, and the water collecting tanks 14 are communicated with a water collecting tank 17 through a connecting pipe 16. For a specific installation form of the quenching cylinder 9, reference may be made to the heating cylinder 6, that is, two rows of second supporting feet may be symmetrically disposed on two sides of the lower portion of the quenching cylinder 9, and the second supporting feet are fixedly connected with a second supporting seat disposed at the bottom of the furnace body 1.
The invention has compact overall layout, but the three regions in the furnace body 1 are required to be separated by a certain region due to different functional properties so as to ensure that the regions do not influence each other, and the specific design modes of the partition plate and the partition curtain can be selected according to various conventions in the prior art.
In addition to the above, the present invention provides a new conveying roller 2 for guiding out a part of heat in the furnace to reduce heat efficiency, wherein the conveying roller 2 can effectively isolate heat transfer to ensure heat efficiency in the furnace body 1, and is especially suitable for being installed in various heating functional areas and heat preservation functional areas of the roller hearth furnace, and of course, the conveying roller 2 can also be adopted entirely.
As shown in connection with fig. 5-7, the conveyor rolls 2 comprise hollow roll shafts 26, both ends of the hollow roll shafts 26 are connected to inner ends of ceramic heat insulation cups 27, outer ends of the ceramic heat insulation cups 27 are connected to shaft rods 28, the shaft rods 28 penetrate through side walls of the furnace body 1 and are mounted on bearing blocks 29 on the outer surface of the furnace body 1 through bearings, as shown in fig. 7, generally the bearing blocks 29 comprise a base body and a base cover, and the bearings are packaged in the base body through the base cover. The outer end of the shaft 28 is provided with a driving wheel 30, and the driving wheel 30 is used for being connected with power, and can take various forms such as gears, chain wheels and the like.
As shown in fig. 6, the ceramic heat insulation cup 27 of the conveying roller comprises a conical hollow cone 31, the hollow cone 31 is made of high-strength and high-heat-insulation ceramic as a main material, a connecting head 32 is embedded in the inner cavity of the hollow cone 31, and the connecting head 32 is generally made of high-strength metal and mainly used for strengthening the hollow cone 31 and bridging with the hollow roller shaft 26. The outer diameter of the end of the connector 32 near the hollow roller shaft 26 is matched with the inner diameter of the hollow roller shaft 26. Shoulders 33 are arranged at two ends of the hollow roll shaft 26, and first key teeth are arranged on the outer circumferential surface of the shoulders 33. The inner end face of the hollow cone 31 of the ceramic heat insulation cup 27 is provided with a groove matched with the shoulder 33, and the inner side wall of the groove is provided with a second key tooth. The hollow roller shaft 26 is sleeved on the connector 32, the shoulder 33 extends into the groove, the first key teeth and the second key teeth are meshed with each other, power transmission is achieved, the outer end of the hollow cone 31 is fixedly connected with the shaft lever 28, and a common fixing mode is flange connection.
Compared with the traditional roller hearth furnace, the hollow roller shaft 26 is adopted, so that the heat conduction efficiency of the hollow roller shaft 26 is lower than that of the traditional solid shaft, and the heat transfer is not facilitated; meanwhile, the hollow roll shaft 26 is connected with the shaft lever 28 through the ceramic heat insulation cup 27, and the main body of the ceramic heat insulation cup is made of ceramic materials, so that the heat conduction performance is poor, and the hollow roll shaft 26 and excessive heat in the furnace can be prevented from being transferred towards the shaft lever 28; the connector 32 can structurally reinforce the ceramic hollow cone 31, so that the structural strength of the ceramic hollow cone is ensured. The hollow cone 31 and the connector 32 may be directly fixed by clamping, tooth-engaging, etc., or may be connected by fastening bolts 36, or may be connected by combining the above modes.
On this basis, in order to further improve the heat insulating performance of the conveying roller 2 and the deformation resistance of the hollow roller shaft 26, the hollow roller shaft 26 and the connecting head 32 are filled with high-temperature-resistant heat insulating filler 34. Meanwhile, in order to avoid the excessive internal pressure of the hollow roller shaft 26, which causes the expansion deformation of the hollow roller shaft, a pressure relief hole 35 penetrating through the hollow cone 31 and the connector 32 is arranged on the side wall of the ceramic heat insulation cup 27, and when the internal pressure is excessive, the pressure can be released through the pressure relief hole 35.
For workpieces with different widths, in order to achieve better positioning and conveying, a limiting sleeve 37 is sleeved outside a section of the hollow roll shaft 26, which is close to two ends, and the limiting sleeve 37 is in threaded connection with the hollow roll shaft 26. The edges on two sides of the workpiece are limited by the limiting sleeve 37, so that the stability of the movement of the workpiece is improved. The rotation limiting sleeve 37 can adjust the position of the rotation limiting sleeve to a certain extent, and of course, in order to prevent the loosening of threads, bolt tightening limiting, stop limiting and other modes can be added on the basis of threaded connection because the conveying roller 2 is in a rotating state.
The furnace wall of the furnace body 1 is formed by two layers of steel plates, and an air heat insulation layer is formed between the two layers of steel plates, so that the heat insulation performance of the furnace body can be further improved, and the heat energy efficiency is further improved. Regarding the sealing of the gap between the shaft lever 28 and the furnace wall of the furnace body 1, the sealing performance cannot be ensured by adopting the conventional sealing mode because the furnace body 1 is in a high temperature state, and the high temperature leakage or the invasion of cold air inside the furnace body 1 can be caused, which can affect the heat energy efficiency. For this purpose, the invention also creates a sealing mode at the gap.
Specifically, as shown in fig. 7, an annular installation cavity 38 centering on the shaft lever 28 is arranged on the furnace wall where the shaft lever 28 is installed, two pieces Feng Pan 39 are fixedly arranged in the installation cavity 38, the edge of the sealing disc 39 is fixedly arranged on the inner side wall of the installation cavity 38, and a high-pressure sealing chamber 40 is formed between the two pieces Feng Pan 39. The invention adopts the technical route that high-pressure gas is injected into the high-pressure sealing chamber 40 so that high pressure exists inside and outside the furnace body 1, thereby avoiding the leakage of the inside and outside of the furnace body 1 and the invasion of the gas outside the furnace body 1. However, how to seal the high pressure seal chamber 40 is a challenge in itself.
To solve the above problem, the pump sleeve 41 is arranged at the center of the seal disk 39, and the pump sleeve 41 is a sleeve slightly larger than the shaft lever 28 and having micro-holes with the shaft lever 28. The pump sleeve 41 is sleeved outside the shaft lever 28 and forms clearance fit with the shaft lever 28. The inner side wall of the pump sleeve 41 is provided with a threaded pump tooth 42, and the pumping direction of the threaded pump tooth 42 faces the high-pressure sealing chamber 40. Since the screw thread pumping teeth 42 of both pumping sleeves 41 pump air towards the high pressure seal chamber 40, the screw thread directions are opposite. The pumping direction toward the high-pressure sealing chamber 40 refers to that the threaded pump teeth 42 and the shaft 28 rotate relatively under the normal conveying condition of the conveying roller 2, and particularly, with the increasing rotation speed of the shaft 28, a pumping force is generated on the threaded pump teeth 42, and at this time, the pressure in the high-pressure sealing chamber 40 is larger, and an external discharging force exists, and the external discharging force and the pumping force are balanced or the pumping force is larger than the external discharging force, so that sealing can be realized.
Therefore, the invention has no sealing property under the state that the conveying roller 2 stops rotating, and only when the conveying roller 2 rotates at a high speed, the pump discharge force can be balanced, so that the sealing is realized. In order to inject high-pressure gas into the high-pressure sealing chamber 40, an air inlet pipe 43 is further disposed on the side wall of the mounting cavity 38, the inner end of the air inlet pipe 43 is communicated with the high-pressure sealing chamber 40, and the air inlet pipe 43 may be further provided with a one-way valve to avoid gas backflushing in the high-pressure sealing chamber 40. During operation of the conveying roller 2, high-pressure gas may be continuously injected through the gas inlet pipe 43 according to the pressure in the high-pressure sealing chamber 40 to ensure pressure balance.

Claims (6)

1. The multifunctional roller hearth furnace comprises a furnace body (1), wherein a plurality of conveying rollers (2) extending along the width direction of the furnace body (1) are arranged in the furnace body (1) side by side along the length direction of the furnace body (1);
the method is characterized in that: the inside of the furnace body (1) is sequentially divided into a heating zone (3), a forming zone (4) and a quenching zone (5) along the length direction of the furnace body (1), and a heating device, a thermoforming device and a quenching device are further arranged in the heating zone (3), the forming zone (4) and the quenching zone (5);
the heating device comprises a flat square cylindrical heating cylinder (6), a plurality of inverted U-shaped first abdication openings (7) matched with the conveying rollers (2) are arranged at intervals on the upper part of the heating cylinder (6), and the conveying rollers (2) are positioned in the first abdication openings (7); an electromagnetic heating coil (8) is arranged on the inner wall of the heating cylinder (6);
the conveying roller (2) comprises a hollow roller shaft (26), two ends of the hollow roller shaft (26) are connected with the inner ends of ceramic heat insulation cups (27), the outer ends of the ceramic heat insulation cups (27) are connected with shaft rods (28), the shaft rods (28) penetrate through the side walls of the furnace body (1) and are arranged on bearing seats (29) on the outer surface of the furnace body (1) through bearings, and driving wheels (30) are arranged at the outer ends of the shaft rods (28);
the ceramic heat insulation cup (27) comprises a conical hollow cone (31), a connector (32) is embedded in the inner cavity of the hollow cone (31), and the outer diameter of one end, close to the hollow roll shaft (26), of the connector (32) is matched with the inner diameter of the hollow roll shaft (26); shoulder (33) are arranged at two ends of the hollow roll shaft (26), and first key teeth are arranged on the outer circumferential surface of the shoulder (33); a groove matched with the shoulder (33) is formed in the inner end face of the hollow cone (31) of the ceramic heat insulation cup (27), and second key teeth are formed in the inner side wall of the groove; the hollow roll shaft (26) is sleeved on the connector (32), the shoulder (33) stretches into the groove, and the first key teeth and the second key teeth are meshed with each other; the outer end of the hollow cone (31) is fixedly connected with the shaft lever (28);
the furnace wall of the furnace body (1) is formed by two layers of steel plates, and an air heat insulation layer is formed between the two layers of steel plates;
an annular mounting cavity (38) taking the shaft lever (28) as a center is formed in the furnace wall where the shaft lever (28) is arranged, two pieces Feng Pan (39) are fixedly arranged in the mounting cavity (38), the edge of the sealing disc (39) is fixedly arranged on the inner side wall of the mounting cavity (38), and a high-pressure sealing chamber (40) is formed between the two pieces Feng Pan (39); the center of the sealing disc (39) is provided with a pump sleeve (41), and the pump sleeve (41) is sleeved outside the shaft lever (28) and is in clearance fit with the shaft lever (28); a threaded pump tooth (42) is arranged on the inner side wall of the pump sleeve (41), and the pumping direction of the threaded pump tooth (42) faces the high-pressure sealing chamber (40); an air inlet pipe (43) is further arranged on the side wall of the mounting cavity (38), and the inner end of the air inlet pipe (43) is communicated with the high-pressure sealing chamber (40).
2. The multifunctional roller hearth furnace of claim 1, wherein: two rows of first supporting feet are symmetrically arranged on two sides of the lower portion of the heating cylinder (6), and the first supporting feet are fixedly connected with a first supporting seat arranged at the bottom of the furnace body (1).
3. The multifunctional roller hearth furnace of claim 2, wherein: the quenching device comprises a quenching cylinder (9) which is in a flat square cylinder shape, a plurality of inverted U-shaped second abdication openings (10) matched with the conveying rollers (2) are arranged at intervals on the upper part of the quenching cylinder (9), and the conveying rollers (2) are positioned in the second abdication openings (10); the inner surfaces of the top and the bottom of the quenching cylinder (9) are respectively provided with a plurality of quenching nozzles (11).
4. A multi-function roller hearth furnace as defined in claim 3, wherein: the upper portion of quenching section of thick bamboo (9) is provided with and gathers gas cap (12), the one end intercommunication of gas cap (12) and blast pipe (13), the other end of blast pipe (13) extends outside furnace body (1).
5. The multifunctional roller hearth furnace of claim 4, wherein: two water collecting tanks (14) extending along the length direction of the quenching cylinder (9) are arranged on the left side and the right side of the lower portion of the quenching cylinder (9), the water collecting tanks (14) are communicated with the quenching cylinder (9) through overflow holes (15), and the water collecting tanks (14) are communicated with a water collecting tank (17) through connecting pipes (16).
6. The multifunctional roller hearth furnace of claim 5, wherein: two rows of second supporting feet are symmetrically arranged on two sides of the lower part of the quenching cylinder (9), and the second supporting feet are fixedly connected with a second supporting seat arranged at the bottom of the furnace body (1).
CN202110930156.XA 2021-08-13 2021-08-13 Multifunctional roller hearth furnace Active CN113621771B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201874725U (en) * 2010-12-09 2011-06-22 江西泰豪特种电机有限公司 Combined comb tooth sealing structure
CN203132337U (en) * 2013-03-04 2013-08-14 中国兵器工业新技术推广研究所 Furnace roller of roller bottom type thermal treatment furnace with internal heat insulation device
CN105603164A (en) * 2016-03-18 2016-05-25 东北轻合金有限责任公司 Roller-hearth quenching furnace
CN109182708A (en) * 2018-08-18 2019-01-11 京港工业炉科技(苏州)有限公司 Hot forming multilayer roller bottom furnace
CN110904320A (en) * 2019-11-14 2020-03-24 北京机电研究所有限公司 Precision heat treatment production line for thin-wall special-shaped aluminum component

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201874725U (en) * 2010-12-09 2011-06-22 江西泰豪特种电机有限公司 Combined comb tooth sealing structure
CN203132337U (en) * 2013-03-04 2013-08-14 中国兵器工业新技术推广研究所 Furnace roller of roller bottom type thermal treatment furnace with internal heat insulation device
CN105603164A (en) * 2016-03-18 2016-05-25 东北轻合金有限责任公司 Roller-hearth quenching furnace
CN109182708A (en) * 2018-08-18 2019-01-11 京港工业炉科技(苏州)有限公司 Hot forming multilayer roller bottom furnace
CN110904320A (en) * 2019-11-14 2020-03-24 北京机电研究所有限公司 Precision heat treatment production line for thin-wall special-shaped aluminum component

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