146results about How to "Strong extrusion rigidity" patented technology

The invention discloses a hot-air drying machine capable of utilizing waste heat and achieving penetrating countercurrent fluidization. The upper portion of a drying tower is connected with an induced draft fan, and the induced draft fan is connected with a cyclone dust removing waste heat efficient recoverer formed by a tube-type heat exchanger and a cyclone dust collector in an overlapped manner in the tangent direction and then is emptied; the air inlet end of the shell side of the tube-type heat exchanger is communicated with the atmosphere, and the air outlet end of the shell side of the tube-type heat exchanger is connected with the lower portion of the drying tower through an air blower and a steam finned heater; and an impeller of the induced draft fan is of a structure that blades are in a hollow and wedged shape, and the contour line of the appearance of the induced draft fan is an involute. According to the hot-air drying machine capable of utilizing the waste heat and achieving the penetrating countercurrent fluidization, creative integration is conducted on waste heat utilization and dust removal, the cyclone dust removing waste heat efficient recoverer is designed out, the equipment input is reduced, and the work efficiency is improved; and due to the fact that sieve mesh cone covers, sieve mesh cone discs, discharging tubes, a stretching vibration transmission shaft and conical plugs are arranged, penetrating, countercurrent, boiling and fluidization drying of materials are exquisitely and perfectly achieved, more energy is saved, the drying quality is higher, the power consumption of the induced draft fan is lower, and the application prospect is wider.

The invention discloses a hot air type penetration reverse flow fluidization drying machine with tail heat utilization and inertial dust collecting functions. The upper portion of a drying tower is connected with an induced draft fan. The induced draft fan is connected with an efficient cyclone dedusting tail heat recovery device in a tangential manner through an inertial dust collecting device and then performs evacuation, wherein the efficient cyclone dedusting tail heat recovery device is formed by overlaying a tube bank type heat exchanger and a cyclone dust collector. The air inlet end of a shell pass of the tube bank type heat exchanger is communicated with atmosphere, and the air outlet end is connected with the lower portion of the drying tower through an air blower and a steam fin heater; and blades of an impeller of the induced draft fan are arranged to be in a radiation shape and are in radial and central symmetry with respect to an impeller shaft, the dust can be cleared up in time through centrifugal force, and safety accidents are avoided. By the adoption of the hot air type penetration reverse flow fluidization drying machine, the drying efficiency is improved, and energy saving and emission reduction are achieved; and more importantly, the disassembly and assembly technology of the induced draft fan is improved greatly, so that pressure applied to the shaft shoulder end face of a screw by components similar to a nut component can be eliminated simply when the induced draft fan is disassembled, and the problem that the induced draft fan is locked continuously and automatically and cannot be disassembled easily under the load action due to threaded assembly is solved effectively; and the hot air type penetration reverse flow fluidization drying machine is especially suitable for convenient and fast disassembly of a large-scale fan which is locked in a threaded manner, and the effect is particularly obvious.

The invention discloses a tail gas recovery dust removal type coal-fired boiler. The tail gas recovery dust removal type coal-fired boiler comprises a boiler body and an induced draft fan. A tail gas tube of the boiler body is connected with the inducted draft fan through an air preheater, a water preheater, a cyclone dust collector and a granite dust collector, and then evacuation is carried out. The air inlet end of the shell side of the air preheater is connected with an air blower, and the air outlet end of the shell side of the air preheater is connected with the boiler body. A water inlet tube of the shell side of the water preheater is connected with a high-position pool, and a water outlet tube of the shell side of the water preheater is connected with a boiler water inlet pump. An impeller of the inducted draft fan is provided with a structure with hollow inverted-drop-shaped blades and a dish-shaped back plate. The contour line of the appearance of the induced draft fan is an involute. Two-stage counterflow heat exchange and dry-wet dust removal are carried out on boiler tail gas to achieve tail heat recovery and dust removal operation, and energy saving and emission reducing are achieved. Due to the structure with the inverted-drop-shaped blades and the dish-shaped back plate, dust on the impeller of the induced draft fan is removed in real time, and meanwhile the strength of the impeller of the fan is increased; and stability is improved, potential safety hazards caused by dust accumulation are effectively eradicated, and wide application prospects are achieved.

The invention discloses a tail heat utilization and dust removal integrated coil-fired boiler. A boiler tail gas pipe is connected with a cyclone dust remover in the tangent direction. Dust is discharged through an air-lock valve at the cone bottom after dust removal is conducted through rotational flow. Tail gas is connected with a cone through a rotational flow ascending pipe and penetrates a tube nest after being uniformly scattered. The tail gas is discharged through a discharge pipe by means of an induced draught fan after being concentrated through a conical hopper on the upper portion. An impeller of the induced draught fan is of a structure that blades are in a hollow wedge shape. The appearance contour line of the induced draught fan is an involute. According to the tail heat utilization and dust removal integrated coil-fired boiler, boiler tail heat utilization and dust removal are innovatively integrated, an efficient cyclone dust removal tail heat utilization device is designed, and therefore tail heat utilization and dust removal are completed in one step, the device input is reduced, and the work efficiency is improved; the blades are in the hollow wedge shape, and therefore dust on the impeller of the induced draught fan is removed in real time, the strength of the impeller of the draught fan is increased, stability is enhanced, accidents caused by dust accumulation are effectively eradicated, and application prospects are wide.

The invention discloses a hot wind type penetration reverse flow drying machine capable of recycling tail heat. A draught hood and a wind inlet hood are arranged at the two ends of a case body of the drying machine respectively. The draught hood is tangentially connected with a cyclone dust removing tail heat efficient recoverer through a draught fan and then evacuation is conducted. A blast blower is connected with the wind inlet hood through a tube type heat exchanger and a steam fin heater. A draught fan impeller is provided with hollow inverse-drop-shaped blades. The outline of the draught fan is an involute. According to the hot wind type penetration reverse flow drying machine capable of recycling tail heat, tail heat recovery and dust removal are creatively integrated, the cyclone dust removing tail heat efficient recoverer is designed, the equipment investment is reduced, and the working efficiency is improved. By means of the draught fan, a soft partition plate and an axial fan, penetration type reverse flow drying is ingeniously achieved, and the working efficiency is improved. The blades are in a hollow inverse drop shape, and therefore real-time cleaning of dust on the impeller is achieved, the strength of the impeller of the draught fan is improved, stability is enhanced, accidents caused by dust accumulation are effectively eradicated, and the application prospects are wide.

The invention discloses a heat pump type exhaust heat utilization counterflow dryer. A draught hood of the dryer is connected with an induced draft fan, and the induced draft fan is emptied after being connected with an evaporator of a heat pump system through a cyclone dust collector; the evaporator of the heat pump system is connected with a host through a refrigerant pipe, and the host is connected with a condenser through a refrigerant pipe; the air outlet end of a blast blower is connected with an air inlet housing through the condenser; an impeller of the induced draft fan is provided with blades shaped like hollow wedges, and a back plate is of a dish-shaped structure; and the outer contour line of the induced draft fan is an involute. The heat pump type exhaust heat utilization counterflow dryer is provided with the induced draft fan, a heat exchanger and a sealed conical hopper which is arranged below a sieve plate steel strip, and the conical hopper is internally provided with an axial fan, so that the penetration-type counterflow low-temperature drying of materials is realized, and the heat pump system is particularly suitable for recovering heat of low-temperature tail gases; and the blades are shaped like hollow wedges, and the back plate is of the dish-shaped structure, so that dust on the impeller of the induced draft fan can be cleared in real time, the strength of the impeller of the fan is improved, the stability is improved, safety accidents caused by dust accumulation is effectively avoided. Therefore, the heat pump type exhaust heat utilization counterflow dryer has a broad application prospect.

The invention discloses a manganese processing rotary kiln system with a gas furnace supplying heat and a draught fan being free of dust accumulation. A rotary kiln is arranged in an inclined mode. A combustor is arranged in the rotary kiln and connected with an air control valve and a gas control valve. An air lock is arranged at the higher end of the rotary kiln for feeding and connected with a dust remover through a fin section and an air pipe. A cover cylinder is arranged outside the fin section, a sleeve type air heat exchanger is arranged outside the air pipe, and the cover cylinder is connected with the gas control valve and the air control valve after being joined with a lower air suction port of the air heat exchanger. The draught fan is of a structure with blades being in a reverse drop shape and a back plate being in a butterfly shape. A convex refractory plate is arranged in the rotary kiln. Through the convex refractory plate, the heat transfer area of the rotary kiln is increased, material stirring is promoted, and heat efficiency is easily improved; through the fin section and the air heat exchanger, tail heat is utilized, and combustion is facilitated; through shock chilling liquid, the environmental protection pressure of production liquid expansion is effectively relieved; because the draught fan is free of dust accumulation, safety accidents are effectively eradicated. The manganese processing rotary kiln system is especially suitable for manganese ore firing processing and has broad application prospects.

The invention discloses a heat pump type drying machine capable of utilizing waste heat and achieving penetrating countercurrent. An air draft hood and an air inlet hood are arranged at the two ends of a drying machine case body respectively, the air draft hood is connected with an induced draft fan, and the induced draft fan is connected with an evaporator of a heat pump system through a cyclone dust collector and then is emptied; the evaporator of the heat pump system is connected with a host through a refrigerant pipe, and the host is connected with a condenser through the refrigerant pipe; the air outlet end of an air blower is connected with the air inlet hood through a condenser; and multiple soft partition plates which are vertically arranged and divide an upper machine case body and a lower machine case body into multiple units are arranged in the drying machine case body. According to the heat pump type drying machine capable of utilizing the waste heat and achieving the penetrating countercurrent, by means of the induced draft fan, the partition plates and axial fans, the penetrating countercurrent drying is exquisitely achieved, and the work efficiency is improved; the heat pump type waste heat utilization is suitable for heat recovery of tail gas with lower temperature and is particularly efficient, convenient and rapid; and by means of the structure that blades are in a hollow and wedged shape and the backing plate is in a disc shape, real-time cleaning of dust on an impeller is achieved, the impeller strength of the induced draft fan is increased, the stability is enhanced, safety accidents caused by dust accumulation is effectively eradicated, and the application prospect is wide.

The invention discloses a hot-air drying machine capable of utilizing waste heat and achieving penetrating countercurrent fluidization. The upper portion of a drying tower is connected with an induced draft fan, and the induced draft fan is connected with a cyclone dust removing waste heat efficient recoverer formed by a tube-type heat exchanger and a cyclone dust collector in an overlapped manner in the tangent direction and then is emptied; the air inlet end of the shell side of the tube-type heat exchanger is communicated with the atmosphere, and the air outlet end of the shell side of the tube-type heat exchanger is connected with the lower portion of the drying tower through an air blower and a steam finned heater; and an impeller of the induced draft fan is of a structure that blades are in a hollow and wedged shape and the backing plate is in a disc shape, and the contour line of the appearance of the induced draft fan is an evolvent. According to the hot-air drying machine capable of utilizing the waste heat and achieving the penetrating countercurrent fluidization, creative integration is conducted on waste heat utilization and dust removal, the cyclone dust removing waste heat efficient recoverer is designed out, the equipment input is reduced, and the work efficiency is improved; and due to the fact that sieve mesh cone covers, sieve mesh cone discs, discharging tubes, a stretching vibration transmission shaft and conical plugs are arranged, penetrating, countercurrent, boiling and fluidization drying of materials are exquisitely and perfectly achieved, more energy is saved, the drying quality is higher, the power consumption of the induced draft fan is lower, and the application prospect is wider.

The invention discloses a mesh turning plate type drying machine utilizing exhaust heat. A drying machine box body is provided with a mesh turning plate type conveyor from top to bottom, the drying machine box body is divided into an upper drying zone, a middle drying zone and a lower drying zone, the upper drying zone is connected with an induced draft fan through an air heat exchanger, emptying is conducted on the upper drying zone, a fresh air outlet of the air heat exchanger is connected with an air inlet of an air blower, an air outlet of the air blower is connected with a steam fin heater in the middle drying zone, an induced draft fan impeller is of a structure with hollow and wedge-shaped blades and a disc-shaped backing plate, and the outline of the induced draft fan is an evolvent. According to the mesh turning plate type drying machine utilizing the exhaust heat, exhaust heat utilization is concise and reasonable, damp and hot exhaust gas which is subjected to heat recovery is discharged through the induced draft fan, effective cooling is conducted on dried materials, the exhaust heat utilization is further conducted, and energy conservation and emission reduction are facilitated; by means of the structure with the hollow and wedge-shaped blades and the disc-shaped backing plate, real-time cleaning of dust is achieved, impeller strength of the induced draft fan is increased, the stability is enhanced, accidents caused by dust accumulation are effectively avoided, and the application prospect is broad.

The invention discloses an air suction type grinder for pseudo-ginseng. The air suction type grinder for the pseudo-ginseng comprises a grinder body and an induced draft fan, wherein the discharging end of the grinder body is connected with the induced draft fan through a material storage case, air suction pipes and a cyclone separator; a ventilation door used for adjusting the air volume is arranged on one of the air suction pipes; and an impeller of the induced draft fan is of a structure with blades in a hollow reverse drop shape, and the shape contour line of the induced draft fan is an involute. By means of the air suction type grinder for the pseudo-ginseng, sorting of particles and cooling and temperature drop of the material are achieved in the pneumatic transmission process; the return and secondary grinding of the coarse particles are completed in one step, the qualified output of the material is achieved, and meanwhile dust capture is achieved; the timely and smooth discharging of the grinder is guaranteed by an air suction system, the material is prevented from being excessively ground, and electric power is saved; by means of the structure with the blades in the hollow reverse drop shape, the real-time cleaning of dust on the impeller of the induced draft fan and the increase of the strength of the impeller of the draught fan are achieved, the stability is improved, and safety accidents caused by dust accumulation are effectively eradicated; and the application prospect is wide.

The invention discloses a cyclone dust removal heat pump type drying room. An internal recycle long-shaft draught fan is arranged in the drying room and comprises a long shaft and blades; the blades are long-strip-shaped; the cross section of each blade is centrosymmetric hollow reverse drop-shaped in the radial direction of an impeller shaft; two ends of the blades are inserted in end discs; the long shaft is connected with and fixed with the end discs through spokes; a draught hood and an air inlet hood are arranged at two ends of the drying room; the draught hood is connected with an induced draft fan; the induced draft fan is connected with the evaporator of a heat pump system via a cyclone dust collector for evacuation; the evaporator of the heat pump system is connected with a host machine; the host machine is connected with a condenser via a refrigerant pipe; the air outlet end of an air blower is connected with the air inlet hood via the condenser; the induced draft fan and the impeller of the long-shaft draught fan are arranged into hollow symmetrical structures, do not accumulate dust, and are firm and durable. The heat pump dries in a cross flow manner, recycles residual heat, is particularly suitable for being adopted by a lower drying temperature system, prevents nutritional ingredients of thermosensitive substances from being destroyed, and completes drying, dust removal and heat recovery in an efficient and low energy consumption manner.

The invention discloses a tail heat recovery and dust removal integrated coal-fired boiler. A boiler exhaust pipe is in tangential connection with a cyclone dust collector, dust is exhausted from a cone bottom through an air-lock valve after cyclone de-dusting, and exhaust enters a cone through a cyclone riser, passes through a tube nest after being uniformly dispersed, and is discharged by an exhaust pipe through an induced draft fan after being centralized by an upper tapered hopper; an impeller of the induced draft fan adopts the structure that blades are shaped like hollow reversed water droplets and a back plate is dish-shaped; the contour line of the induced draft fan is an involute. The tail heat recovery and dust removal integrated coal-fired boiler creatively integrates boiler tail heat recovery and dust removal, and a cyclone dust removal efficient tail heat recoverer is designed to complete tail heat recovery and dust removal in one step, so that the equipment investment is reduced and the working efficiency is improved; as the structure that the blades are shaped like hollow reversed water droplets and the back plate is dish-shaped is adopted, dust on the impeller of the induced draft fan can be cleaned in real time, the impeller strength of the induced draft fan is improved, the stability is enhanced, safety accidents caused by dust accumulation are effectively prevented, and the application prospect is wide.

The invention discloses a huperzia serrata ventilation type crusher. The huperzia serrata ventilation type crusher comprises a crusher and an induced draft fan, wherein a blanking end of the crusher is connected with the induced draft fan by a storage box, an exhaust pipe and a cyclone separator; an air door for adjusting an air volume is arranged on the exhaust pipe; an impeller of the induced draft fan has blades with hollow wedged structures; and the outline of the induced draft fan is an involute. The huperzia serrata ventilation type crusher realizes the particle separation and the material cooling in the pneumatic conveying process, and finishes the coarse particle returning and the secondary crushing by one step to realize the qualified material outputting and the dust capturing; a ventilation system guarantees timely smooth discharge of the crusher to prevent excessive material crushing and save electric power; as the blades are hollow wedged structures, the real-time removal of dust on the impeller of the induced draft fan is realized, the strength of the impeller of the fan is enhanced, the stability is promoted, and safety accidents caused by dust accumulation are effectively prevented; and the application prospect is broad.

The invention discloses a tail heat recovery hot wind type penetration countercurrent fluidized dryer. The upper part of a drying tower is connected with an induced draft fan; the induced draft fan is tangentially connected with a cyclone dust removal tail heat efficient recoverer formed by superposing a shell and tube heat exchanger and a cyclone dust remover for evacuation; a shell pass intake end of the shell and tube heat exchanger is communicated with atmosphere, and an exhaust end is connected with the lower part of the drying tower by an air blower and a steam fin heater; an impeller of the induced draft fan has a structure with hollow reverse water drop-shaped blades and a disc-shaped back plate; and the outline of the induced draft fan is an involute. The cyclone dust removal tail heat efficient recoverer is designed through creatively integrating the tail heat recovery with the dust removal, so that the equipment investment is reduced, and the working efficiency is improved; and as a screen hole conical cover, a screen hole conical disc, a blanking pipe, an extension vibration transmission shaft and a conical plug are arranged, the penetration, the backflow, the boiling and the fluidized drying of materials are skillfully and perfectly realized, more energies are saved, the drying quality is higher, the fan power consumption is lower, and the application prospect is broader.

The invention discloses a heat pump type tunnel drying device with a baffling dust removal function. A trolley is arranged on a rail of a tunnel, long-shaft fans for internal circulation are arranged in the tunnel, vanes of each long-shaft fan are long-strip-shaped, the section of each vane is in a hollow wedge shape centrosymmetric about the axial radial direction of an impeller, two ends of each vane are inserted into end plates, and each long shaft is fixedly connected with the corresponding end plates through spokes; an air suction hood and an air inlet hood are arranged at two ends of the tunnel adopting a sealed structure, the air suction hood is connected with an induced draft fan, and the induced draft fan is connected with an evaporator of a heat pump system through a dust remover and then emptied; the evaporator of the heat pump system is connected with a main unit, and the main unit is connected with a condenser; an air outlet end of an air blower is connected with the air inlet hood through the condenser; the induced draft fan and the impeller of the long-shaft fans are designed to adopt a hollow symmetric structure and are light, ingenious, solid and durable, and dust cannot be accumulated. Crossflow drying and waste heat recovery of a heat pump are especially suitable for low-temperature drying, nutritional ingredients of thermosensitive substances can be prevented from being damaged, and the system can finish drying, dust removal and heat recovery efficiently at low energy consumption.

The invention discloses a heat-pump type exhaust heat utilization penetration counter-flow fluidized drying machine. A material seal screw feeder is arranged at the upper part of a drying tower, and an air-lock valve discharging machine is arranged at the bottom of the drying tower; the upper part of the drying tower is connected to an induced draft fan; the induced draft fan is connected to an evaporator of a heat pump system through a cyclone dust collector and then exhausts; the evaporator of the heat pump system is connected with a main machine through a refrigerant pipe; the main machine is connected with a condenser through the refrigerant pipe; the air outlet end of an air blower is connected with the lower part of the drying tower through the condenser; an impeller of the induced draft fan is provided with blades, each blade takes the shape a hollow wedge and each back plate adopts a dish-shaped structure; and the shape contour line of the induced draft fan is an involute. According to the invention, by arranging sieve pore conical covers, sieve pore conical disks, material falling pipes, a stretching vibration transmission shaft and conical plugs, penetration, counter-flow, boiling and fluidized drying of materials can be realized skillfully and perfectly, a classical boiling reflux drying mode is completely overtaken, more energy conservation, higher drying quality and lower power consumption of the air blower are realized; and the heat-pump type exhaust heat utilization is specially suitable for recovery of heat from exhaust gas with relatively low temperature.

The invention discloses a tail heat recovery hot air type penetrating counterflow fluidized drying machine. The upper portion of a drying tower is connected with an induced draft fan, the induced draft fan is tangentially connected with a cyclone dust removal tail heat efficient recoverer formed by overlapping a tube type heat exchanger and a cyclone dust collector, and then evacuation is carried out. The shell side air inlet end of the tube type heat exchanger is communicated with the air, and the air outlet end of the tube type heat exchanger is connected with the lower portion of the drying tower through an air blower and a steam fin heater. An impeller of the induced draft fan is provided with the structure with hollow inverted-drop-shaped blades. The contour line of the appearance of the induced draft fan is an involute. According to the tail heat recovery hot air type penetrating counterflow fluidized drying machine, tail heat recovery and dust removal are creatively integrated, the cyclone dust removal tail heat efficient recoverer is designed, equipment investment is reduced, and work efficiency is improved. Screen mesh cone covers, screen mesh cone discs, a blanking tube, a telescopic vibration transmission shaft and a conical plug are arranged, so that penetrating, counterflow, boiling and fluidized drying on materials are achieved ingeniously and perfectly, more energy is achieved, and the drying quality is higher; and the power consumption of the fan is lower, and wider application prospects are achieved.

The invention discloses a tail heat utilization and dust removal integrated coal fired boiler. According to the tail heat utilization and dust removal integrated coal fired boiler, a tail gas pipe of the boiler is tangentially connected with a cyclone dust remover, and dust is discharged at the cone base through a closed-air aspirator after rotational flow dust removal; tail gas is connected with a cone through a rotational flow ascending pipe and penetrates row pipes after being uniformly dispersed, and the tail gas is centralized by a cone hopper on the upper portion and exhausted out by an induced draft fan through an exhaust pipe; an impeller of the induced draft fan is of a structure with blades in a hollow wedge shape and a backboard is in a dish shape; and the shape contour line of the induced draft fan is an involute. According to the tail heat utilization and dust removal integrated coal fired boiler, tail heat utilization and the dust removal of the boiler are creatively integrated, and a cyclone dust removal tail heat efficient using device is designed; the tail heat utilization and the dust removal are completed in one step, the equipment input is reduced, and the working efficiency is also improved; by means of the structure with the blades in the hollow wedge shape and the backboard in the dish shape, the real-time cleaning of the dust on the impeller of the induced draft fan and the increase of the strength of the impeller of the draught fan are achieved, the stability is improved, and safety accidents caused by dust accumulation are effectively eradicated; and the application prospect is wide.

The invention discloses a tail heat utilized hot-air type penetration countercurrent fluidized drying machine. A draught fan is connected to the upper part of a drying tower; the draught fan is tangentially connected with a cyclone dust removal tail heat efficient recoverer which is formed by a tube type heat exchanger and a cyclone dust collector which are overlapped, and is evacuated; the shell pass air inlet end of the tube type heat exchanger is communicated with the atmosphere; the air outlet of the tube type heat exchanger is connected to the lower part of the drying tower through an air blower and a steam fin heater; blades of the draught fan impeller are arranged in a radiation manner that impeller shafts are in radial and central symmetry; dust can be collected by virtue of centrifugal force in time, and thus security accidents can be avoided. By adopting the tail heat utilized hot-air type penetration countercurrent fluidized drying machine, the drying efficiency is improved, the purposes of energy conservation and emission reduction are achieved, more importantly, the assembling and disassembling technique of the draught fan is greatly improved, pressure caused by components such as a screw nut to the shoulder end surface of a screw shaft can be easily eliminated when the draught fan is assembled and disassembled, the problem that the draught fan is continuously automatically locked and is not easy to disassemble under the action of load in threaded assembling can be effectively solved, and the tail heat utilized hot-air type penetration countercurrent fluidized drying machine is particularly applicable to convenient and rapid disassembling after a large-size draught fan is in threaded locking and is particularly remarkable in effect.

The invention discloses a heat pump type tail heat recycling inertial dust collection penetrating countercurrent fluidization drying machine. A material seal spiral feeder is arranged on the upper portion of a drying tower, and a closed-air aspirator discharging machine is arranged at the bottom of the drying tower; an induced draft fan is connected to the upper portion of the drying tower, and is connected with an evaporator of a heat pump system through a cyclone dust collector and a repeated reciprocating type inertial dust collector and then is subject to venting; the air outlet end of an air blower is connected with the lower portion of the drying tower through a condenser; blades of an induced draft fan impeller are arranged to be in a radiation shape in impeller shaft radial and central symmetry, centrifugal force can be used for cleaning up dust in time, and safety accidents are avoided; and according to the drying machine, the drying efficiency is improved, energy saving and emission reduction are achieved, more importantly, the dismounting and mounting technology of the induced draft fan is greatly changed, and therefore during dismounting, the pressure of similar nut components on the end face of a screw shaft shoulder can be simply eliminated; and the problem that according to the induced draft fan thread assembly, automatic locking is continuously carried out under the load effect, and dismounting is not likely to be achieved is effectively solved, and the drying machine is particularly suitable for portable dismounting of a large-scale fan obtained after thread locking, and the effect is particularly obvious.

The invention discloses a rotary kiln system capable of utilizing residual heat for stoving and with no dirt retention on an induced draft fan. A rotary kiln is arranged in an inclined manner; a burner is arranged in the rotary kiln; the high end of the rotary kiln and one end of a dryer are connected with an air hose in a bidirectional manner through a discharging pipe; a conveyer belt is arranged in the dryer and is connected with the discharging pipe; a star discharger is arranged at the other end of the dryer; a bulged refractory slab is arranged in the rotary kiln; the induced draft fan for dust removal has the structure of wedge-shaped blades and a dished backboard. According to the invention, the bulged refractory slab increases the heat transfer area of the rotary kiln, promotes stirring of a material, and facilitates improvement of thermal efficiency; the dryer utilizes residual heat to facilitate forming and drying of a globular material; residual heat utilization and heat preservation consequent reaction of hot material have the remarkable energy-saving characteristic; a quenching liquid pool rapidly cools a pellet material, and plenty of water is evaporated through reaction, so that the environmental protection pressure caused by expansion of producing fluid is effectively relieved; the induced draft fan does not accumulate dirt to completely eradicate a safety accident; the rotary kiln system is particularly suitable for burning processing of vanadium ore and is broad in application prospect.