阅读说明：本技术 一种热成型辊底炉 (Thermal forming roller hearth furnace ) 是由 钱洁明 于 2021-08-13 设计创作，主要内容包括：本发明涉及辊底炉技术领域。目的在于提供一种热成型辊底炉,包括炉体,所述炉体内沿炉体的长度方向并排布置有若干沿炉体宽度方向延伸的输送辊；所述炉体内沿炉体的长度方向依次分为加热区、成型区和淬火区,所述加热区、成型区和淬火区内还设置有加热装置、热成型装置和淬火装置；所述热成型装置包括若干组沿炉体的长度方向分布的成型组件,所述成型组件的位置与输送辊之间的缝隙相对,成型组件包括成型压辊和成型导辊。本发明采用多组成型组件逐渐对带板进行成型弯折,弯折效果好,不易回弹,同时实现了对带板在输送过程中的同步成型,加工效率极高。(The invention relates to the technical field of roller hearth furnaces. The aim is to provide a hot forming 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 furnace body is sequentially divided into a heating area, a forming area and a quenching area along the length direction of the furnace body, and a heating device, a thermal forming device and a quenching device are arranged in the heating area, the forming area and the quenching area; the hot forming device includes the shaping subassembly that the length direction of a plurality of groups edge furnace body distributes, the gap between the position of shaping subassembly and the conveying roller is relative, and the shaping subassembly includes shaping compression roller and shaping deflector roll. The belt plate is gradually formed and bent by adopting a plurality of groups of forming assemblies, the bending effect is good, the belt plate is not easy to rebound, synchronous forming of the belt plate in the conveying process is realized, and the processing efficiency is extremely high.)

1. A thermal forming 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 furnace body (1) is sequentially divided into a heating area (3), a forming area (4) and a quenching area (5) along the length direction of the furnace body (1), and a heating device, a thermal forming device and a quenching device are further arranged in the heating area (3), the forming area (4) and the quenching area (5);

the hot forming device comprises a plurality of groups of forming assemblies distributed along the length direction of the furnace body (1), the forming assemblies are opposite to gaps between the conveying rollers (2), and each forming assembly comprises a forming press roller and a forming guide roller;

the forming press roller comprises a press roller body (18) and conical discs (19) arranged at two ends of the press roller body (18), and the press roller body (18) is fixedly connected with the inner wall of the top of the furnace body (1) through a press roller connecting frame; the forming guide rollers comprise guide roller bodies (20) and rotary rollers (21) sleeved outside the guide roller bodies (20), the forming guide rollers are obliquely arranged in pairs at two sides of the forming press rollers, and the oblique angles are matched with the conical surfaces of the conical discs (19); the upper end of the guide roller body (20) is arranged on an upper roller seat (22) on the inner walls of 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) at 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 two sides of the furnace body (1) through a guide roller connecting frame;

an inclined bent plate area (24) is formed between the rotary drum (21) and the conical surface of the conical disc (19); the angle of inclination of the bending zone (24) of each forming assembly is gradually increased along the conveying direction of the workpieces.

2. The thermoforming roller hearth furnace of claim 1, wherein: the compression roller connecting frame comprises an H-shaped frame (25), the lower end of the H-shaped frame (25) is fixedly connected with the compression roller body (18) through two hoops, and the upper end of the H-shaped frame (25) is fixedly connected with a third supporting seat arranged on the inner side wall of the top of the furnace body (1).

3. The thermoforming roller hearth furnace of claim 2, wherein: the upper end and the lower end of the guide roller body (20) are respectively connected with an upper roller seat (22) and a lower roller seat (23) in a rotating way.

4. The thermoforming roller hearth furnace of claim 3, wherein: the conveying roller (2) comprises a hollow roller shaft (26), two ends of the hollow roller shaft (26) are connected with the inner end of a ceramic heat insulation cup (27), the outer end of the ceramic heat insulation cup (27) is connected with a shaft lever (28), the shaft lever (28) penetrates through the side wall of the furnace body (1) and is installed on a bearing seat (29) on the outer surface of the furnace body (1) through a bearing, and a driving wheel (30) is arranged on the outer end of the shaft lever (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); shoulders (33) are arranged at two ends of the hollow roll shaft (26), and first key teeth are arranged on the peripheral surfaces of the shoulders (33); a groove matched with the shoulder (33) is formed in the end face of the inner end of the hollow cone (31) of the ceramic heat insulation cup (27), and second key teeth are arranged on the inner side wall of the groove; the hollow roll shaft (26) is sleeved on the connector (32), the shoulder (33) extends 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).

5. The thermoforming roller hearth furnace of claim 4, wherein: the hollow roll shaft (26) and the connecting head (32) are both filled with high-temperature-resistant heat-insulating filler (34).

6. The thermoforming roller hearth furnace of claim 5, wherein: and a pressure relief hole (35) penetrating through the hollow cone (31) and the connector (32) is formed in the side wall of the ceramic heat insulation cup (27).

7. The thermoforming roller hearth furnace of claim 6, wherein: the furnace wall of the furnace body (1) is composed of two layers of steel plates, and an air heat insulation layer is formed between the two layers of steel plates.

8. The thermoforming roller hearth furnace of claim 7, wherein: an annular mounting cavity (38) taking the shaft lever (28) as the center is formed in the furnace wall at the mounting position of the shaft lever (28), two sealing discs (39) are fixedly arranged in the mounting cavity (38), the edge of each 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 sealing discs (39); a pump sleeve (41) is arranged in the center of the sealing disc (39), and 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); the side wall of the mounting cavity (38) is further provided with an air inlet pipe (43), and the inner end of the air inlet pipe (43) is communicated with the high-pressure sealing chamber (40).

9. The thermoforming roller hearth furnace of claim 8, wherein: the bearing seat (29) comprises a seat body and a seat cover, and the bearing is packaged in the seat body through the seat cover.

Technical Field

The invention relates to the technical field of roller hearth furnaces, in particular to a thermal forming roller hearth furnace.

Background

The roller hearth furnace is a general name of a series of self-conveying furnace bodies, the conveying rollers are arranged in the furnace bodies, so that workpieces are automatically conveyed in the furnace bodies, the processing procedures of heating, annealing, quenching and the like are completed in the conveying process, and the assembly line processing of the workpieces in the furnace is realized. However, the roller hearth furnace has the following problems to be solved due to the natural defects of the structure during the use process:

firstly, the traditional roller hearth furnace has single function, namely, the traditional roller hearth furnace is an independent thermal forming roller hearth furnace or an independent quenching roller hearth furnace, a work piece does not complete a process, and the work piece needs to be transferred among different devices, so that the whole processing efficiency is influenced.

Secondly, the traditional roller hearth furnace does not have the continuous conveying and forming function, namely, the workpiece cannot be naturally bent and formed in the conveying process, but the workpiece needs to be bent and pressed by a punching machine, a press machine and the like after being stopped to be conveyed, and the production and processing efficiency is greatly influenced.

And thirdly, 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 transferred 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 effect of the furnace body is influenced. Meanwhile, the heat in the furnace body can also overflow from the mounting seam of the power coupling end of the conveying roller on the furnace body, and although the sealing is improved in some modes in the prior art, the overall effect is poor, and the heat energy effect can also be influenced.

Disclosure of Invention

The invention aims to provide a thermoforming roller hearth furnace with high processing efficiency.

In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: a thermal forming 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 furnace body is sequentially divided into a heating area, a forming area and a quenching area along the length direction of the furnace body, and a heating device, a thermal forming device and a quenching device are arranged in the heating area, the forming area and the quenching area;

the hot forming device comprises a plurality of groups of forming assemblies distributed along the length direction of the furnace body, the forming assemblies are opposite to gaps among the conveying rollers, and each forming assembly comprises a forming press roller and a forming guide roller;

the forming press roller comprises a press roller body and conical discs arranged at two ends of the press roller body, and the press roller body is fixedly connected with the inner wall of the top of the furnace body through a press roller connecting frame; the forming guide rollers comprise guide roller bodies and rotary rollers sleeved outside the guide roller bodies, the forming guide rollers are obliquely arranged in pairs at two sides of the forming press roller, and the oblique angles are matched with the conical surfaces of the conical discs; the upper end of the guide roller body is arranged on an upper roller seat on the inner walls of two sides of the upper part of the furnace body, the lower end of the guide roller body is arranged on a lower roller seat at the center of the lower part of the furnace body, and the lower roller seat is fixedly connected with the inner walls of two sides of the furnace body through a guide roller connecting frame;

an inclined bent plate area is formed between the rotary drum and the conical surface of the conical disc; the inclination angle of the bent plate area of each forming assembly is gradually increased along the conveying direction of the workpieces.

Preferably, the compression roller connecting frame comprises an H-shaped frame, the lower end of the H-shaped frame is fixedly connected with the compression roller body through two hoops, and the upper end of the H-shaped frame is fixedly connected with a third supporting seat arranged on the inner side wall of the top of the furnace body.

Preferably, the upper end and the lower end of the guide roller body are respectively connected with the upper roller seat and the lower roller seat in a rotating mode.

Preferably, the conveying roller comprises a hollow roller shaft, two ends of the hollow roller shaft are connected with the inner end of the ceramic heat-insulating cup, the outer end of the ceramic heat-insulating cup is connected with a shaft rod, the shaft rod penetrates through the side wall of the furnace body and is installed on a bearing seat on the outer surface of the furnace body through a bearing, and a driving wheel is arranged on the outer end of the shaft rod;

the ceramic heat insulation 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; shoulders are arranged at two ends of the hollow roll shaft, and first key teeth are arranged on the peripheral surfaces of the shoulders; a groove matched with the shoulder is formed in the end face of the inner end of the hollow cone of the ceramic heat insulation cup, and second key teeth are arranged on the inner side wall of the groove; the hollow roll shaft is sleeved on the connecting head, the shoulder extends 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, high-temperature-resistant heat-insulating filler is filled in both the hollow roll shaft and the connecting head.

Preferably, the side wall of the ceramic heat-insulating cup is provided with a pressure relief hole penetrating through the hollow cone and the connector.

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 installation cavity taking the shaft rod as a center is formed in the furnace wall at the shaft rod installation position, two sealing discs are fixedly arranged in the installation cavity, the edge of each sealing disc is fixedly arranged on the inner side wall of the installation 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 lever and forms clearance fit with the shaft lever; 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 to the high-pressure sealing chamber; the side wall of the mounting cavity is further provided with an air inlet pipe, and the inner end of the air inlet pipe is communicated with the high-pressure sealing chamber.

Preferably, the bearing seat comprises a seat body and a seat cover, and the bearing is encapsulated in the seat body through the seat cover.

The beneficial effects of the invention are concentrated and expressed as follows: adopt multiunit shaping subassembly to carry out the shaping gradually to the band plate and buckle, it is effectual to buckle, difficult resilience, realized simultaneously to the synchronous molding of band plate in transportation process, machining efficiency is high. Specifically, in the using process of the invention, the strip plate workpiece is pressed on the conveying roller by the forming press roller and conveyed along the conveying roller, and in the conveying process, the edge of the strip plate is gradually bent by the forming guide roller along with the gradual increase of the angle of the plate bending area, and finally the strip plate is formed into a groove-shaped strip plate; compared with the traditional mode, the bending machine is gradually bent in the conveying process of the strip plate, a press part such as a press machine and the like is not needed to be stopped or used, the bending plate forming is completed completely by the guide of the forming guide roller and the forming press roller, the continuous non-stop production can be realized, and the processing efficiency is extremely high. And because the strip plate workpiece is gradually bent at a high temperature, the internal stress is well released, the strip plate workpiece is not easy to rebound after being processed, and the produced groove-shaped strip plate has stable quality.

Drawings

FIG. 1 is a schematic structural view of a furnace body according to the present invention;

FIG. 2 is a schematic view of the internal structure of the furnace body corresponding to the heating zone;

FIG. 3 is a schematic structural view of a heating cartridge;

FIG. 4 is a schematic view 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 fig. 1-7 comprises a furnace body 1, and the roller hearth furnace is the same as the conventional 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 a strip plate workpiece, namely a strip plate workpiece. In general, the form of carrying can be directly adopted, and under partial requirements, the form of clamping and conveying can also be adopted, and the carrying is mainly taken as an example for description in the text.

In order to realize one-time processing and forming of the strip plate, the invention integrates multiple functions of heating and heat preservation, bending and forming, quenching and heat treatment and the like, and combines the structure shown in figure 1, a strip plate workpiece moves from left to right under the conveying action of a conveying roller 2, the inside of the furnace body 1 is sequentially divided into a heating area 3, a forming area 4 and a quenching area 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 area 3, the forming area 4 and the quenching area 5. As the name suggests, the heating device, the hot forming device and the quenching device are respectively used for heating, bending and forming and quenching the workpiece.

Different from the traditional heating mode, as shown in fig. 2 and 3, the heating device of the invention comprises a heating cylinder 6 in a flat square cylinder shape, 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 first supporting seats arranged at the bottom of the furnace body 1. Of course, the specific fixing manner of the heating cartridge 6 may also be adjusted as required in case of satisfying the fixing requirements. The upper portion of the heating cylinder 6 is provided with a plurality of inverted U-shaped first yielding openings 7 matched with the conveying rollers 2 at intervals, and the conveying rollers 2 are located in the first yielding openings 7. The main effect of first letting a mouthful 7 lies in being convenient for provide the space of letting a place to the installation of conveying roller 2, avoids the occupation conflict with conveying roller 2, be provided with electromagnetic heating coil 8 on the inner wall of cartridge heater 6. The upper and lower uniform heating of the workpiece is completed through the electromagnetic heating coil 8, compared with the traditional roller hearth furnace. According to the invention, heating, forming and quenching are arranged on the same roller hearth furnace line, so that continuous processing of the strip plate is realized, and the efficiency is greatly improved; adopt electromagnetic heating coil 8 to heat the band plate, pollute for a short time, purified workshop environment, conveniently carry out efficient intelligent control to the temperature simultaneously.

In the aspect of hot forming, the conventional roller hearth furnace adopts an intermittent processing manner during hot forming, that is, a workpiece is conveyed to a forming device, the conveying is stopped, and the workpiece is bent by a press, a plate bender and the like, but this manner is not suitable for continuous forming of a strip-shaped plate, and the processing efficiency is low, and therefore, the second difference of the present invention is that: the thermoforming device includes the shaping subassembly that a plurality of groups distributed along the length direction of furnace body 1, the position of shaping subassembly is relative with the gap between conveying roller 2, avoids with conveying roller 2 mutual interference, and the shaping subassembly includes shaping compression roller and shaping deflector roll. In other words, the hot forming device of the present invention is composed of a plurality of forming rolls and forming guide rollers arranged along the length direction of the furnace body 1 in the heating zone 4. The forming press roller is used for limiting bending of the upper surface of the workpiece, and the forming guide roller is used for limiting 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, and the press roll body 18 is fixedly connected with the inner wall of the top 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 roll, the press roll connecting frame comprises an H-shaped frame 25, the lower end of the H-shaped frame 25 is fixedly connected with the press roll body 18 through two anchor ears, and the upper end of the H-shaped frame 25 is fixedly connected with a third supporting seat arranged on the inner side wall of the top of the furnace body 1. The shaping deflector roll includes guide roll body 20 and the rotary drum 21 of cover outside the guide roll body 20, the shaping deflector roll sets up in pairs of the both sides slope of shaping pressure roller, and inclination cooperatees with the conical surface of conical disk 19. The upper end of the guide roller body 20 is arranged on the 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 the lower roller seat 23 at the center of the lower part of the furnace body 1, 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, and 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 the forming operation is carried out, namely the plate bending operation, the conveying roller 2, the forming press roller and the forming guide roller cooperate to bend the edge of the plate-provided workpiece together. An inclined bending plate area 24 is formed between the rotary roller 21 and the conical surface of the conical disc 19, and the inclined angle of the bending plate area 24 of each forming assembly is gradually increased along the conveying direction of the workpieces. In the conveying process, the workpiece is limited through the bent plate area 24, so that the edge of the workpiece is changed along with the inclination angle of the bent plate area 24, and final forming is realized. In other words, the strip workpiece is pressed on the conveying roller 2 by the forming press roller and conveyed along the conveying roller 2, and in the conveying process, the edge of the strip is gradually bent by the forming guide roller along with the gradual increase of the angle of the bent plate area 24, and finally the strip is formed into a groove-shaped strip; compared with the traditional mode, the bending machine is gradually bent in the conveying process of the strip plate, a press part such as a press machine and the like is not needed to be stopped or used, the bending plate forming is completed completely by the guide of the forming guide roller and the forming press roller, the continuous non-stop production can be realized, and the processing efficiency is extremely high. And because the strip plate workpiece is gradually bent at a high temperature, the internal stress is well released, the strip plate workpiece is not easy to rebound after being processed, and the produced groove-shaped strip plate has stable quality.

The conical disc 19 and the rotary drum 21 of the invention are respectively arranged on the pressing roller body 18 and the guide roller body 20 and can rotate freely. In order to further promote the self-rotation performance of shaping deflector roll, the upper and lower both ends of guide roll body 20 rotate with last roller holder 22 and lower roller holder 23 respectively and are connected, so, through the free rotation of rotary drum 21 on guide roll body 20, guide roll body 20 on the upper and lower roller holder free rotation, communicate and form dual rotation, the risk of reduction cardboard that can be very big improves the smoothness nature.

The quenching device comprises a flat square cylinder-shaped quenching cylinder 9, wherein a plurality of inverted U-shaped second yielding openings 10 matched with the conveying roller 2 are arranged at the upper part of the quenching cylinder 9 at intervals, and the conveying roller 2 is positioned in the second yielding openings 10. The overall shape of the quenching cylinder 9 is similar to that of the heating cylinder 6, but instead of the electromagnetic heating coil 8, the inner surfaces of the top and bottom of the quenching cylinder 9 are provided with a plurality of quenching nozzles 11, respectively. The quenching nozzles 11 can spray quenching liquid to perform quenching heat treatment on the high-temperature strip plate, and it should be noted that the positions of the quenching nozzles 11 should be uniformly arranged, and a relatively complete spraying area coverage on the workpiece is ensured.

In the quenching operation process, because a large amount of mist is generated, in order to avoid the direct escape of the mist to influence the production environment, the mist can be collected to a certain extent, as shown in fig. 4, a gas gathering cover 12 is arranged on the upper part of the quenching cylinder 9, the gas gathering 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 is conveyed through the exhaust pipe 13, and finally, the exhaust is realized, and the exhaust pipe 13 can be externally connected and connected with a workshop exhaust system, so that the exhaust pipe can be flexibly designed by a person skilled in the art according to actual conditions, and is not described herein again.

Of course, in the quenching process, there is a residual part of the quenching liquid, and in order to collect the residual part of the quenching liquid, two water collecting grooves 14 extending along the length direction of the quenching cylinder 9 are arranged on the left and right sides of the lower part of the quenching cylinder 9, the water collecting grooves 14 are communicated with the quenching cylinder 9 through an overflowing hole 15, and the water collecting grooves 14 are communicated with a water collecting tank 17 through a connecting pipe 16. Regarding the specific installation form of the quenching cylinder 9, refer to the heating cylinder 6, that is, two rows of second supporting legs may also be symmetrically arranged on two sides of the lower portion of the quenching cylinder 9, and the second supporting legs are fixedly connected with a second supporting seat arranged at the bottom of the furnace body 1.

The overall layout of the invention is compact, but three areas in the furnace body 1 should be separated into certain areas due to different functional properties so as to ensure that the areas are not affected with each other, and the specific design mode of the partition boards and the partition curtains can refer to various conventional choices in the prior art.

In addition to the above, the invention also provides a novel conveying roller 2 for solving the problem that the existing conveying roller 2 of the roller hearth furnace can guide out a part of heat in the furnace to further reduce the heat energy efficiency, the conveying roller 2 can effectively isolate heat transfer, ensure the heat energy efficiency in the furnace body 1, and is particularly suitable for being installed in various heating functional areas and heat preservation functional areas of the roller hearth furnace for use, and of course, the conveying roller 2 can be completely adopted.

Referring to fig. 5-7, the conveying roller 2 comprises a hollow roller shaft 26, two ends of the hollow roller shaft 26 are connected with the inner end of a ceramic heat-insulating cup 27, the outer end of the ceramic heat-insulating cup 27 is connected with a shaft 28, the shaft 28 penetrates through the side wall of the furnace body 1 and is mounted on a bearing seat 29 on the outer surface of the furnace body 1 through a bearing, as shown in fig. 7, generally, the bearing seat 29 comprises a seat body and a seat cover, and the bearing is packaged in the seat body through the seat cover. The outer end of the shaft 28 is provided with a drive wheel 30, the drive wheel 30 being adapted for power connection, which may take the form of gears, sprockets, etc.

As shown in fig. 6, the ceramic heat insulation cup 27 of the conveyor 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 an inner cavity of the hollow cone 31, and the connecting head 32 is usually made of high-strength metal and mainly used for reinforcing the strength of the hollow cone 31 and bridging the hollow roller shaft 26. The outer diameter of the end of the connecting head 32 close to the hollow roll shaft 26 is matched with the inner diameter of the hollow roll shaft 26. The hollow roll shaft 26 is provided with shoulders 33 at both ends thereof, and first key teeth are provided on the outer circumferential surfaces of the shoulders 33. The end face of the inner end 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 second key teeth. The hollow roll 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 to realize power transmission, the outer end of the hollow cone 31 is fixedly connected with the shaft rod 28, and the common fixing mode is flange connection.

In the use process, 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 conduction is not beneficial to heat transfer; meanwhile, the hollow roll shaft 26 is connected with the shaft rod 28 through the ceramic heat insulation cup 27, the main body material of the ceramic heat insulation cup is made of ceramic materials, the heat conduction performance is poor, and excessive heat in the hollow roll shaft 26 and the furnace can be prevented from being transferred to the shaft rod 28; the connector 32 can also structurally reinforce the ceramic hollow cone 31, so that the structural strength of the hollow cone is ensured. The hollow cone 31 and the connector 32 can be directly fixed by clamping, key tooth meshing and the like, or can be connected by a fastening bolt 36, or can be connected in a mode of mutually combining the modes.

On the basis, in order to further improve the heat insulation 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 insulation fillers 34. Meanwhile, in order to avoid the hollow roll shaft 26 from being burst and deformed due to excessive internal pressure, the side wall of the ceramic heat-insulating cup 27 is provided with a pressure relief hole 35 penetrating through the hollow cone 31 and the connector 32, and when the internal pressure is excessive, the pressure can be released through the pressure relief hole 35.

For workpieces with different plate widths, in order to realize better positioning and conveying, a section of the hollow roller shaft 26 close to two ends is also sleeved with a limiting sleeve 37, and the limiting sleeve 37 is in threaded connection with the hollow roller shaft 26. The edges of the two sides of the workpiece are limited by connecting the limiting sleeves 37, so that the movement stability of the workpiece is improved. The position of the rotary limiting sleeve 37 can be adjusted to a certain extent, and of course, since the conveying roller 2 is in a rotating state, in order to prevent the thread from loosening, a bolt fastening limiting mode, a stop limiting mode and the like can be added on the basis of threaded connection.

The furnace wall of the furnace body 1 is composed of 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 28 and the furnace wall of the furnace body 1, since the furnace body 1 is in a high temperature state, the sealing performance cannot be ensured by adopting a traditional sealing mode, and high temperature leakage or internal cold air invasion inside the furnace body 1 can be caused, which affects the thermal energy efficiency. Therefore, the invention also creates a sealing mode at the gap.

Specifically, as shown in fig. 7, an annular mounting cavity 38 is provided around the shaft 28 in the furnace wall where the shaft 28 is mounted, two seal disks 39 are fixedly provided in the mounting cavity 38, the edge of the seal disk 39 is fixedly provided on the inner side wall of the mounting cavity 38, and a high-pressure seal chamber 40 is formed between the two seal disks 39. The invention adopts the technical route that high-pressure gas is injected into the high-pressure sealing chamber 40 so as to ensure that the high pressure exists inside and outside the furnace body 1, thereby avoiding the leakage inside 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 big problem in itself.

In order to solve the above problem, the present invention provides a pump sleeve 41 in the center of the sealing disk 39, and the pump sleeve 41 is a sleeve slightly larger than the shaft 28 and having a micro-pore with the shaft 28. The pump sleeve 41 is sleeved outside the shaft rod 28 and forms clearance fit with the shaft rod 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 sealed chamber 40. The pump teeth 42 of the two pump sleeves 41 are opposite in thread direction because they are both pumping towards the high pressure seal chamber 40. The pumping direction towards the high-pressure sealing chamber 40 is to say that in the normal conveying state of the conveying roller 2, the threaded pump teeth 42 and the shaft rod 28 rotate relatively, and particularly, along with the rotation speed of the shaft rod 28 becoming faster and faster, the threaded pump teeth 42 generate a pumping force, and at the moment, when the pressure in the high-pressure sealing chamber 40 is higher, an external discharge force exists, and the external discharge force is balanced with the pumping force or the pumping force is greater than the external discharge force, so that sealing can be realized.

Therefore, the invention has no sealing property when the conveying roller 2 stops rotating, and the pump discharge force can be balanced only when the conveying roller 2 rotates at high speed to realize sealing. In order to inject high-pressure gas into the high-pressure sealing chamber 40, an air inlet pipe 43 is further arranged 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 can be further provided with a one-way valve to avoid gas recoil in the high-pressure sealing chamber 40. During the operation of the conveying roller 2, high-pressure gas can be continuously injected through the gas inlet pipe 43 according to the pressure in the high-pressure sealed chamber 40, so as to ensure pressure balance.