CN111578694A - Silicon carbide fiber heat treatment roller furnace - Google Patents

Abstract

The utility model provides a carborundum fibre thermal treatment roller furnace, includes the rollgang, locates the material loading roll table of rollgang one end and locates the unloading roll table of the rollgang other end, the rollgang is equipped with first washing transition bin, not melting section furnace body, second washing transition bin, heat cross-linking section furnace body and third washing transition bin from material loading end to unloading end in proper order, first washing transition bin, second washing transition bin and third washing transition bin all set at least one gate. The invention has the advantages of realizing continuous production, improving production efficiency, reducing energy consumption and the like.

Description

Silicon carbide fiber heat treatment roller furnace

Technical Field

The invention relates to silicon carbide fiber heat treatment equipment, in particular to a silicon carbide fiber heat treatment roller furnace.

Background

At present, the existing silicon carbide fiber production technology in China adopts a non-melting treatment process and a thermal crosslinking treatment process which are separated into two steps, and continuous production equipment which is suitable for the combination of the non-melting treatment process and the thermal crosslinking treatment process of Polycarbosilane (PCS) fibers in the silicon carbide fiber production process is not provided. The non-melting treatment process and the thermal cross-linking treatment process adopt a box-type furnace to furnace heat treatment, the box-type furnace is not easy to realize automatic feeding and discharging production, manual conveying feeding and discharging are adopted for conversion among different processes, continuous batch production cannot be realized, the box-type furnace needs to undergo temperature rise, constant temperature and temperature reduction processes every time, a large amount of electric energy is consumed in the temperature reduction process, the time span is lengthened, the production efficiency is lower, and the capacity increase can only depend on increasing the number of devices. In addition, in the process of non-melting treatment of the silicon carbide fiber, the material is easy to generate spontaneous combustion phenomenon in the temperature range of 140 ℃ to 180 ℃, and the box-type furnace can not be used for treatment.

Silicon carbide fibers are very fragile and ambient air flow rates are not allowed to exceed 0.1m/s, otherwise the fibers are very fragile. A traditional roller furnace adopts a branch pipe branch air inlet mode, each furnace body and each temperature area are provided with a branch air pipe for air inlet, the branch pipe extends into the furnace body and is divided into a plurality of points for air inlet in a refractory material masonry, the common air inlet points are arranged on a straight line and cannot be used for integral air inlet at the bottom of the whole temperature area, so that air flow is relatively concentrated, the air flow speed is relatively high, the flow direction is disordered, and the requirements of a silicon carbide fiber heat treatment process cannot be met. Furthermore, the air inlet pipeline has no preheating structure, the process atmosphere still has a relatively low temperature state when entering the hearth, and cold airflow impacts the atmosphere in the hearth to influence the temperature uniformity of the hearth. On the other hand, the fibers require a production environment with high cleanliness, especially dust-free. The hearth of the existing roller furnace is generally built by adopting refractory materials, the refractory materials are generally light or heavy insulating bricks, ceramic fiber boards and the like, dust can be generated in the using process, or tiny particles fall off from the bricks, so that the cleanliness of materials in a sagger is influenced, and therefore, the requirements of a Polycarbosilane (PCS) fiber treatment process on the production environment cannot be met. In addition, the existing roller furnace generally adopts a single independent heating element to be arranged at the upper side and the lower side of a hearth at a certain distance, saggars are conveyed and passed by a middle bearing material, because the heating elements are spaced, the influence of air flow in the furnace is superposed, the temperature of the saggars in the hearth is not uniform, in the production process of silicon carbide fibers, when the continuous production of a non-melting treatment process and a thermal crosslinking treatment process of intermediate products, namely Polycarbosilane (PCS) fibers is carried out, the requirement on process parameters is very high, the maximum use temperature of the non-melting treatment is about 250 ℃, the maximum use temperature of the thermal crosslinking treatment is about 500 ℃, and under the condition of low temperature, the temperature uniformity of the saggars in the hearth is very difficult to reach +/-5. Further, in order to improve the temperature uniformity in the furnace of the device, the number of elements is increased due to the small distance between the heating elements, and when the number of elements is large, each heating element needs to be installed and replaced one by one, which is time-consuming.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the silicon carbide fiber heat treatment roller furnace which can realize continuous production, improve the production efficiency and reduce the energy consumption.

In order to solve the technical problems, the invention adopts the following technical scheme:

the utility model provides a carborundum fibre thermal treatment roller furnace, includes the rollgang, locates the material loading roll table of rollgang one end and locates the unloading roll table of the rollgang other end, the rollgang is equipped with first washing transition bin, not melting section furnace body, second washing transition bin, heat cross-linking section furnace body and third washing transition bin from material loading end to unloading end in proper order, first washing transition bin, second washing transition bin and third washing transition bin all set at least one gate.

As a further improvement of the above technical solution: the heat cross-linking section furnace body and the non-melting section furnace body are both provided with a hearth and a main gas inlet pipe, a preheating buffer cavity is arranged in the hearth, a gas storage buffer cavity is arranged below the hearth, a plurality of air inlet buffer cavities are uniformly arranged below the air storage buffer cavity, the air inlet main pipe is communicated with each air inlet buffer cavity through a plurality of air inlet branch pipes, a plurality of first vent holes are uniformly arranged between the air inlet buffer cavity and the air storage buffer cavity, a plurality of second vent holes are uniformly arranged between the air storage buffer cavity and the preheating buffer cavity, a lower heating component is arranged in the preheating buffer cavity, a lower separation baffle plate is arranged above the preheating buffer cavity, and a plurality of third vent holes are uniformly formed in the lower separation partition plate, the sum of the flow areas of the first vent holes is S1, the sum of the flow areas of the second vent holes is S2, and the sum of the flow areas of the third vent holes is S3, so that S1 is more than S2 and more than S3.

As a further improvement of the above technical solution: the first vent hole and the second vent hole are both strip-shaped holes and are staggered with each other, and the third vent hole is a round hole; s2 is 1.5S 1-2.5S 1, S3 is 1.5S 2-2.5S 2.

As a further improvement of the above technical solution: the furnace is internally provided with an exhaust buffer cavity, an upper separation partition plate is arranged below the exhaust buffer cavity, a plurality of fourth vent holes are uniformly formed in the upper separation partition plate, and an exhaust pipe communicated with the exhaust buffer cavity is arranged above the furnace.

As a further improvement of the above technical solution: and a transverse reinforcing rib is arranged in the hearth, and the exhaust pipe is positioned above the transverse reinforcing rib.

As a further improvement of the above technical solution: the exhaust buffer cavity is internally provided with an upper heating assembly, the upper heating assembly and the lower heating assembly respectively comprise a drawer box, a heating resistance wire, supporting tubes and positioning bricks, the drawer box is provided with a track, the positioning bricks are respectively arranged at two ends of the drawer box, a plurality of positioning grooves are uniformly formed in the positioning bricks, the supporting tubes are provided with a plurality of positioning grooves which are corresponding to the end parts one by one, and the heating resistance wire is wound on each supporting tube.

As a further improvement of the above technical solution: the heat cross-linking section furnace body and the non-melting section furnace body comprise a furnace shell and a refractory material layer positioned on the inner side of the furnace shell, metal coamings are arranged on the inner side of the refractory material layer, the metal coamings are encircled to form a hearth, and expansion joints are arranged at two ends of the hearth.

As a further improvement of the above technical solution: the expansion joint comprises an elastic folding plate and connecting flanges which are respectively arranged at two ends of the elastic folding plate, end plates are fixedly arranged at the end parts of the metal enclosing plates, and one of the connecting flanges is fixedly connected with the end plates.

As a further improvement of the above technical solution: the position that the roller shaft that supplies the rollgang passes of metal bounding wall is equipped with the through-hole, be equipped with wear ring in the through-hole, wear ring periphery is equipped with the dust ring, and the mid point welding that is located the metal bounding wall of furnace downside has bearing structure.

As a further improvement of the above technical solution: an observation channel and a fire extinguishing gas inlet pipe are arranged on the non-melting section furnace body in a penetrating mode.

Compared with the prior art, the invention has the advantages that: the invention discloses a silicon carbide fiber heat treatment roller furnace which is provided with a conveying roller way, wherein a feeding roller way and a discharging roller way are respectively arranged at two ends of the conveying roller way, automatic feeding and discharging can be realized, manual carrying for feeding and discharging is not needed, the conveying roller way is sequentially provided with a first cleaning transition bin, a non-melting section furnace body, a second cleaning transition bin, a heat cross-linking section furnace body and a third cleaning transition bin along the conveying direction, the first cleaning transition bin, the second cleaning transition bin and the third cleaning transition bin are all provided with at least one gate, and the cleaning transition bins are used for realizing connection between the heat cross-linking section furnace body and the non-melting section furnace body, so that the purposes of automatically cleaning atmosphere and process communication are achieved, continuous production can be realized, repeated heating and cooling treatment on equipment is not needed, energy consumption is saved, and production efficiency is improved.

Drawings

FIG. 1 is a schematic top view of a roller hearth furnace for heat treatment of silicon carbide fibers according to the present invention.

FIG. 2 is a schematic front view of the thermal cross-linking stage furnace and the non-melting stage furnace according to the present invention.

FIG. 3 is a schematic side view of the thermal cross-linking stage furnace and the non-melting stage furnace according to the present invention.

Fig. 4 is a schematic structural diagram of each cleaning transition bin in the invention.

Fig. 5 is a front view schematically showing the structure of the intake buffer chamber in the present invention.

Fig. 6 is a schematic top view of the intake buffer chamber of the present invention.

Fig. 7 is a schematic structural view of the first vent hole in the present invention.

Fig. 8 is a schematic structural view of the second vent hole in the present invention.

Fig. 9 is a schematic structural view of a third vent hole or a fourth vent hole in the present invention.

Fig. 10 is an enlarged perspective view of the expansion joint of the present invention.

Fig. 11 is an enlarged view of the wear ring and dust ring of the present invention.

Fig. 12 is a perspective view of a heating unit according to the present invention.

The reference numerals in the figures denote: 1. an upper heating assembly; 2. a lower heating assembly; 3. an upper separation baffle; 31. a fourth vent hole; 4. a lower separation baffle; 41. a third vent hole; 5. a hearth; 51. a preheating buffer chamber; 52. an exhaust buffer chamber; 53. transverse reinforcing ribs; 6. a drawer box; 61. a track; 7. heating resistance wires; 8. supporting a tube; 9. positioning the brick; 91. positioning a groove; 10. a furnace shell; 20. building a refractory material layer; 30. a metal coaming; 301. an end plate; 302. a through hole; 303. a wear ring; 304. a dust ring; 40. an expansion joint; 401. an elastic folding plate; 402. a connecting flange; 50. a rollgang; 501. a first cleaning transition bin; 502. a thermal cross-linking section furnace body; 503. a second cleaning transition bin; 504. a non-melting section furnace body; 505. a third cleaning transition bin; 506. a gate; 507. a fire extinguishing gas inlet pipe; 508. high-purity setting soft cotton; 509. high-purity loose cotton; 60. a support structure; 70. blocking strips; 80. a main air inlet pipe; 801. a gas storage buffer cavity; 802. an air inlet buffer chamber; 803. a first vent hole; 804. a second vent hole; 805. an intake branch pipe; 90. an exhaust pipe; 100. a feeding roller way; 200. and (5) blanking a roller way.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples of the specification.

Fig. 1 to 12 show an embodiment of a roller furnace for heat treatment of silicon carbide fiber according to the present invention, the roller furnace for heat treatment of silicon carbide fiber of the present embodiment includes a roller conveyor 50, a feeding roller 100 disposed at one end of the roller conveyor 50, and a discharging roller 200 disposed at the other end of the roller conveyor 50, the roller conveyor 50 is sequentially provided with a first cleaning transition bin 501, a non-melting section furnace body 504, a second cleaning transition bin 503, a thermal cross-linking section furnace body 502, and a third cleaning transition bin 505 from the feeding end to the discharging end, and the first cleaning transition bin 501, the second cleaning transition bin 503, and the third cleaning transition bin 505 are all provided with at least one gate 506. The feeding roller bed 100 and the discharging roller bed 200 can be formed by bending and tailor-welding metal plates, particularly, the lower part of the feeding roller bed 100 and the discharging roller bed 200 is formed by bending thin plates to form a support structure, the upper layer of the feeding roller bed is formed by bending thin plates to form fixed supports, a plurality of fixed roller shafts are inserted between the fixed supports, ceramic roller wheels are installed on the roller shafts, the outer diameter vertexes of the ceramic roller wheels form a working plane of the feeding and discharging roller bed, the feeding and discharging roller beds are driven by a motor chain wheel, chain transmission is adopted between the roller shafts, sagger transition transmission and buffering functions in the whole automatic system are achieved, the preferred feeding roller bed 100 and the preferred discharging roller bed 200; each cleaning transition bin can be composed of a metal shell, a bracket, a cylinder driving device and the like, a ceramic roller wheel is arranged on a roller shaft, and the saggars are driven to run by friction force, so that the saggars can be orderly fed into and discharged from the equipment; preferably, the first cleaning transition bin 501 is formed by a single gate 506 structure driven by an air cylinder, so that a dustproof function is realized; the non-melting section furnace body 504 and the heat cross-linking section furnace body 502 adopt a sealing structure design, the non-melting section furnace body 504 is filled with air atmosphere, the heat cross-linking section furnace body 504 is filled with nitrogen atmosphere, a second cleaning transition bin 503 between the two sections of furnace bodies forms 3 cleaning bins by 4 gates 506, the condition that the atmosphere around the sagger is converted into nitrogen from air is realized, the cleaning speed is high, and the high-yield and quick transmission requirements are met; the third cleaning transition bin 505 behind the heat cross-linking section furnace body 504 adopts 4 gates to form the structure of 3 cleaning bins in the same way, thereby realizing the dustproof and cleaning functions.

The silicon carbide fiber heat treatment roller furnace is provided with a conveying roller way 50, a feeding roller way 100 and a discharging roller way 200 are respectively arranged at two ends of the conveying roller way 50, the automatic feeding and discharging and the continuous conveying of materials can be realized, the manual carrying of the feeding and discharging is not needed, the conveying roller 50 is sequentially provided with a first cleaning transition bin 501, a non-melting section furnace body 504, a second cleaning transition bin 503, a heat cross-linking section furnace body 502 and a third cleaning transition bin 505 along the conveying direction, the first cleaning transition bin 501, the second cleaning transition bin 503 and the third cleaning transition bin 505 are all provided with at least one gate 506, the connection between the heat cross-linking section furnace body 502 and the non-melting section furnace body 504 is realized by utilizing the cleaning transition bins, the purposes of automatically cleaning atmosphere and process communication are achieved, continuous production can be realized, repeated heating and cooling treatment on equipment is not needed, energy consumption is saved, and production efficiency is improved.

Further, the heat cross-linking section furnace body 502 and the non-melting section furnace body 504 are both provided with a furnace chamber 5 and a main air inlet pipe 80, a preheating buffer chamber 51 is arranged in the furnace chamber 5, a buffer gas storage chamber 801 is arranged below the furnace chamber 5, a plurality of buffer gas inlet chambers 802 are uniformly arranged below the buffer gas storage chamber 801, the main air inlet pipe 80 is communicated with the buffer gas inlet chambers 802 through a plurality of branch air inlet pipes 805, a plurality of first vent holes 803 are uniformly arranged between the buffer gas inlet chambers 802 and the buffer gas storage chamber 801, a plurality of second vent holes 804 are uniformly arranged between the buffer gas storage chamber 801 and the preheating buffer chamber 51, a lower heating assembly 2 is arranged in the preheating buffer chamber 51, a lower separation partition plate 4 is arranged above the preheating buffer chamber 51, a plurality of third vent holes 41 are uniformly arranged on the lower separation partition plate 4, the sum of the flow areas of the first vent holes 803 is S1, the sum of the flow areas of the second vent holes 804 is S2, and the sum of the flow areas, then S1 < S2 < S3. When the device works, air atmosphere or nitrogen atmosphere is input from the air inlet main pipe 80 and then enters each air inlet buffer cavity 802 through each air inlet branch pipe 805 to realize the first shunting and pressure reduction effect, the gas in the air inlet buffer cavity 802 enters the air storage buffer cavity 801 through the first vent holes 803, the second pressure reduction and speed reduction effect is realized by adopting the mode of large buffer space matched with large flow area, the gas in the air storage buffer cavity 801 enters the preheating buffer cavity 51 through the second vent holes 804, the lower heating component 2 is arranged in the preheating buffer cavity 51, the third pressure reduction and speed reduction effect is carried out on the gas flow by adopting the mode of large flow area and the gas flow is fully preheated, the process gas is uniformly dispersed into the whole hearth 5 through the third vent holes 41 on the lower separation partition plate 4 after being heated, the process atmosphere in the hearth 5 is ensured to be uniform, and the gas flow velocity around the silicon carbide fiber to be treated is less than 0., meanwhile, the problem that the temperature uniformity in the hearth 5 is influenced by the gas inlet atmosphere is avoided, and the quality of production materials is ensured; on the other hand, the lower separation baffle plate 4 is used for separating the hearth 5 from the lower heating assembly 2, the lower heating assembly 2 does not directly heat the materials in the hearth 5, the lower separation baffle plate 4 is firstly heated by radiation, the materials in the hearth 5 are heated in a whole-plate heat transfer radiation mode after the lower separation baffle plate 4 is heated, the harsh process environment requirements of silicon carbide fiber production are met, the uniformity of the temperature around the sagger in the hearth 5 is less than or equal to +/-5 ℃ at the process use temperature of 250-500 ℃ in the hearth 5, and after the temperature in the hearth exceeds 500 ℃, the higher the temperature is, the better the uniformity of the temperature in the hearth 5 is, and the integral structure is simple and reliable.

Furthermore, in this embodiment, the first vent 803 and the second vent 804 are both elongated holes and are staggered to each other, which is beneficial to ensuring two-stage buffering effect on the atmosphere, and the third vent 41 is a round hole, which is beneficial to the atmosphere to be uniformly dispersed into the whole furnace 5.

Preferably, S2 is 1.5S 1-2.5S 1, and S3 is 1.5S 2-2.5S 2. In this embodiment, S2 is 2S1, and S3 is 2S2, so that the rapid pressure reduction and deceleration effect on the atmosphere can be realized by a large flow area. Of course, in other embodiments, the adjustment may be performed as appropriate.

Further, in this embodiment, an exhaust buffer chamber 52 is disposed in the furnace 5, an upper separation plate 3 is disposed below the exhaust buffer chamber 52, a plurality of fourth vent holes 31 are uniformly disposed on the upper separation plate 3, and an exhaust pipe 90 communicated with the exhaust buffer chamber 52 is disposed above the furnace 5. The process waste gas enters the exhaust buffer cavity 52 through the fourth vent hole 31 on the upper separation cover plate 3 and is finally exhausted through the exhaust pipe 90, so that the purpose of smooth exhaust is achieved. As a preferable technical solution, in the present embodiment, the area of the upper heating module 1 covering the upper separation barrier 3 and the area of the lower heating module 2 covering the lower separation barrier 4 are not less than 85%.

Furthermore, in the present embodiment, the top of the hearth 5 is provided with a transverse rib 53, and the exhaust pipe 90 is located above the transverse rib 53. Wherein the transverse direction is also the axial direction of the roller shafts of the rollgang 50. The structure is favorable for avoiding the local high pressure formed by the air exhaust from the top, and causes the uneven air exhaust, so that the uneven airflow in the hearth 5 is ensured.

Further, in this embodiment, an upper heating element 1 is disposed in the exhaust buffer cavity 52, the upper heating element 1 and the lower heating element 2 both include a drawer box 6, a heating resistor wire 7, a support tube 8 and a positioning brick 9, the drawer box 6 is provided with a rail 61, the positioning brick 9 is respectively disposed at two ends of the drawer box 6, a plurality of positioning grooves 91 are uniformly disposed on the positioning brick 9, the support tube 8 is provided with a plurality of tracking grooves 91 corresponding to end portions one to one, and the heating resistor wire 7 is wound around each support tube 8. The upper side and the lower side of a hearth 5 are respectively covered completely by an upper separation clapboard 3 and a lower separation clapboard 4, the upper separation clapboard 3 is used for separating the hearth 5 from an upper heating assembly 1, the lower separation clapboard 4 is used for separating the hearth 5 from a lower heating assembly 2, the upper heating assembly 1 and the lower heating assembly 2 do not directly heat materials in the hearth 5, but the corresponding separation clapboards are firstly heated in a radiation mode, the materials in the hearth 5 are heated in a whole-plate heat transfer radiation mode after the separation clapboards are heated, the harsh technological environment requirements of silicon carbide fiber production are met, the temperature uniformity around a box bowl in the hearth 5 is less than or equal to +/-5 ℃ between the process use temperature of 250 ℃ and 500 ℃ in the hearth 5, and the higher the temperature is after the temperature in the hearth exceeds 500 ℃, the better the temperature uniformity in the hearth 5 is, and the whole structure is simple and reliable; furthermore, the drawer box 6 is matched with the rail 61, so that the modular rapid replacement of the upper heating assembly 1 and the lower heating assembly 2 can be realized, and the efficiency is improved; set up constant head tank 91 on the locating brick 9, 8 tip of stay tube are positioned in constant head tank 91, and heating resistor silk 7 twines on stay tube 8, and overall structure is simple, the reliability is high and be convenient for maintain. In the present embodiment, the support tube 8 is a corundum tube.

Further, in this embodiment, the heat cross-linking furnace body 502 and the non-melting furnace body 504 both include a furnace shell 10 and a refractory material lining 20 located inside the furnace shell 10, a metal shroud 30 is provided inside the refractory material lining 20, the metal shroud 30 surrounds to form a furnace chamber 5, and expansion joints 40 are provided at two ends of the furnace chamber 5. The refractory material course 20 may be, for example, a ceramic fiber board; for the non-melting section furnace body 504, the use temperature is relatively low, the metal shroud 30 can be made of 304 stainless steel plates, for the thermal-adhesive coupling section furnace body 502, the use temperature is relatively high, and the metal shroud 30 can be made of 301 stainless steel plates. The metal coamings 30 are arranged on the inner side of the refractory material layer 20, and the metal coamings 30 are encircled to form the hearth 5, so that the hearth 5 and the refractory material layer 20 can be isolated by the metal coamings 30, dust and particles generated by the refractory material layer 20 cannot enter the hearth 5 in the using process, and the metal coamings 30 cannot easily generate dust and particles in the using process, so that higher cleanliness in the hearth 5 can be kept, and the harsh requirement of a silicon carbide fiber heat treatment process is met; furthermore, the metal coaming 30 has more expansion after being heated, and the expansion joints 40 are arranged at the two ends, so that the extrusion degree between the front and the rear adjacent furnace bodies can be adaptively adjusted, the furnace arching phenomenon is avoided, and the structure is simple and reliable. Further, for the heat preservation treatment of the roller shaft, the roller shaft is wrapped by punching high-purity shaped soft cotton 508, and high-purity loose cotton 509 is filled in the gap between the transmission box and the upper and lower heating boxes, so that the heat preservation effect is excellent, and the lightweight equipment is facilitated.

Further, in this embodiment, the expansion joint 40 includes an elastic folding plate 401 and connecting flanges 402 respectively disposed at two ends of the elastic folding plate 401, the end plate 301 is fixedly disposed at an end portion of the metal enclosing plate 30, and one of the connecting flanges 402 is fixedly connected with the end plate 301. When the metal surrounding plate 30 expands due to heating and extrudes the elastic folding plate 401, the elastic folding plate 401 can contract, and after the metal surrounding plate 30 is cooled, the elastic folding plate 401 extends to always keep the sealing connection between the front and rear furnace bodies. As the preferred technical scheme, the connecting flange 402 is provided with an inner threaded hole, the end plate 301 is provided with a round through hole, and the expansion joint 40 is connected inside the hearth 5 by using a fastener, so that the mounting difficulty of the expansion joint 40 is reduced.

In this embodiment, through holes 302 are formed in the portions of the metal enclosing plates 30 through which the roller shafts of the roller conveyor 50 pass (specifically, the middle upper portions of the metal enclosing plates 30 on the left and right sides), wear-resistant rings 303 are arranged in the through holes 302, and dust-blocking rings 304 are arranged on the peripheries of the wear-resistant rings 303. Through wear-resisting ring 303 and dust blocking ring 304, prevent that the dust from getting into in furnace 5, simple structure, reliable. The wear-resistant ring 303 and the dust-blocking ring 304 can be made of the same material as the metal enclosing plate 30, and the wear-resistant ring 303 and the dust-blocking ring are welded into a whole. As a preferred technical solution, the barrier strips 70 can be arranged on the metal enclosing plates 30 on the left and right sides, and the barrier strips 70 are higher than the working surface of the roller conveyor 50, so as to provide a guiding function and prevent the sagger from deviating and impacting the metal enclosing plates 30 on the left and right sides.

In this embodiment, the supporting structure 60 is welded to the midpoint of the metal shroud 30 at the lower side of the hearth 5, so that the metal shroud 30 extends from the midpoint of the furnace body to the two ends when being heated and extended.

Furthermore, an observation channel (not shown in the figure) and a fire extinguishing gas inlet pipe 507 are arranged on the non-melting section furnace body 504 in a penetrating way, so that production personnel can smoothly observe the production conditions inside the hearth 5 at the temperature of 140-180 ℃, such as whether the material is spontaneously combusted or not. Furthermore, a high-pressure nitrogen gas inlet pipe bank is arranged beside each observation channel, so that gas can be timely introduced for treatment aiming at the sudden spontaneous combustion phenomenon, and the larger loss is avoided.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims (10)

1. The utility model provides a carborundum fibre heat treatment roller hearth furnace which characterized in that: including rollgang (50), locate material loading roller way (100) of rollgang (50) one end and locate unloading roller way (200) of rollgang (50) other end, rollgang (50) are equipped with first washing transition bin (501), not melt section furnace body (504), second washing transition bin (503), heat cross-linking section furnace body (502) and third washing transition bin (505) from material loading end to unloading end in proper order, first washing transition bin (501), second washing transition bin (503) and third washing transition bin (505) all set at least one gate (506).

2. The silicon carbide fiber heat treatment roller hearth furnace according to claim 1, wherein: the heat cross-linking section furnace body (502) and the non-melting section furnace body (504) are respectively provided with a hearth (5) and an air inlet main pipe (80), a preheating buffer cavity (51) is arranged in the hearth (5), an air storage buffer cavity (801) is arranged below the hearth (5), a plurality of air inlet buffer cavities (802) are uniformly arranged below the air storage buffer cavity (801), the air inlet main pipe (80) is communicated with the air inlet buffer cavities (802) through a plurality of air inlet branch pipes (805), a plurality of first vent holes (803) are uniformly arranged between the air inlet buffer cavities (802) and the air storage buffer cavities (801), a plurality of second vent holes (804) are uniformly arranged between the air storage buffer cavities (801) and the preheating buffer cavities (51), a lower heating component (2) is arranged in the preheating buffer cavities (51), a lower separation clapboard (4) is arranged above the preheating buffer cavities (51), and a plurality of third vent holes (41) are uniformly arranged on the lower separation clapboard (4), when the sum of the flow areas of the first vent holes (803) is S1, the sum of the flow areas of the second vent holes (804) is S2, and the sum of the flow areas of the third vent holes (41) is S3, S1 < S2 < S3.

3. The silicon carbide fiber heat treatment roller hearth furnace according to claim 2, wherein: the first vent hole (803) and the second vent hole (804) are both strip-shaped holes and are staggered with each other, and the third vent hole (41) is a round hole; s2 is 1.5S 1-2.5S 1, S3 is 1.5S 2-2.5S 2.

4. The silicon carbide fiber heat treatment roller hearth furnace according to claim 2, wherein: be equipped with exhaust cushion chamber (52) in furnace (5), exhaust cushion chamber (52) below is equipped with separation baffle (3), evenly be provided with a plurality of fourth vent holes (31) on last separation baffle (3), furnace (5) top be equipped with blast pipe (90) of exhaust cushion chamber (52) intercommunication.

5. The silicon carbide fiber heat treatment roller hearth furnace according to claim 4, wherein: a transverse reinforcing rib (53) is arranged in the hearth (5), and the exhaust pipe (90) is located above the transverse reinforcing rib (53).

6. The silicon carbide fiber heat treatment roller hearth furnace according to claim 4, wherein: be equipped with heating element (1) in exhaust buffer chamber (52), go up heating element (1) and heating element (2) down and all include drawer box (6), heating resistor silk (7), stay tube (8) and positioning brick (9), drawer box (6) have set track (61), positioning brick (9) branch is located the both ends of drawer box (6), evenly seted up a plurality of constant head tanks (91) on positioning brick (9), stay tube (8) are equipped with and locate a plurality ofly with and tip one-to-one in constant head tank (91), heating resistor silk (7) are around locating each on stay tube (8).

7. The silicon carbide fiber heat treatment roller hearth furnace according to any one of claims 1 to 6, wherein: the heat cross-linking section furnace body (502) and the non-melting section furnace body (504) comprise a furnace shell (10) and a refractory material layer (20) located on the inner side of the furnace shell (10), a metal coaming (30) is arranged on the inner side of the refractory material layer (20), the metal coaming (30) is encircled to form a hearth (5), and expansion joints (40) are arranged at two ends of the hearth (5).

8. The silicon carbide fiber heat treatment roller hearth furnace according to claim 7, wherein: the expansion joint (40) comprises an elastic folding plate (401) and connecting flanges (402) which are respectively arranged at two ends of the elastic folding plate (401), the end part of the metal enclosing plate (30) is fixedly provided with an end plate (301), and one of the end plate and the connecting flange (402) is fixedly connected with the end plate (301).

9. The silicon carbide fiber heat treatment roller hearth furnace according to claim 7, wherein: the part of the metal enclosing plate (30) for the roller shaft of the conveying roller way (50) to penetrate is provided with a through hole (302), a wear-resisting ring (303) is arranged in the through hole (302), the periphery of the wear-resisting ring (303) is provided with a dust-blocking ring (304), and the middle point of the metal enclosing plate (30) on the lower side of the hearth (5) is welded with a supporting structure (60).

10. The silicon carbide fiber heat treatment roller hearth furnace according to any one of claims 1 to 6, wherein: an observation channel and a fire extinguishing gas inlet pipe (507) are arranged on the non-melting section furnace body (504) in a penetrating way.

Images