CN206570197U - A kind of sludge dewatering treatment system - Google Patents

Abstract

The utility model is related to a kind of sludge dewatering treatment system, including pushing away mud system, sludge dewatering system and mud cake crushing system, by it is described push away mud system sludge be delivered to sludge dewatering system carry out mud-water separation, mud cake is formed after sludge dewatering and falls into mud cake crushing system and realizes pulverization process；Pushing away the setting of tapering point in mud system can not only make the push of sludge raw material more smoothly; it can also reduce discharging opening diameter; the diameter of discharging opening, which is limited, simultaneously makes its friction smaller when second piston is contacted with discharging opening, protect the service life of second piston, prevent it from wearing and tearing.The problem of sludge dewatering system has floor space small, easy to maintain and operated, sets case effectively to lift the sealing property of complete machine, the setting of differential mechanism can meet the processing of different solid content liquid, substantially increase complete machine safe running performance.

Description

A kind of sludge dewatering treatment system

Technical field

The utility model is related to sludge and takes off book processing equipment field, more particularly to a kind of sludge dewatering treatment system.

Background technology

At present, existing sludge dewatering equipment is that in the state of closed, sludge squeezing through more than half frames is squeezed into by high-pressure pump Pressure, makes the water in sludge be discharged by filter cloth, so as to reach the efficiency of dehydration.But existing equipment is in the process of separation of solid and liquid In, the susceptible to plugging phenomenon of appearance is all there is, can only be rinsed, thus be made by being passed through a large amount of water in order to prevent from blocking it Into the waste at water source, and a large amount of water rinse the burden for adding that who is changed in sewage disposal, equal to the work(for having made to be dehydrated successively again, And bath must shut down operation, the production running of enterprise or society so have impact on.Other existing sludge raw material is being taken off Be before water by mixer add water mixing after be diluted, pug is then squeezed into by device for dehydrating sladge waste by external membrane pump In, but the power output of existing membrane pump is up to 8kg, sludge dewatering limited by membrane pump power output so that dehydrating effect compared with Difference, and be diluted with water in this step equal to a step has been made, it is not only wasted time and energy, and can not also meet production requirement, together. more When after mud cake can be produced after sludge dewatering treatment, the mud cake is last by manually carrying out pulverization process, and this processing mode is not only carried The employment cost of Gao Liao enterprises, wastes time and energy, also reduces operating efficiency.

Utility model content

The applicant is directed to above-mentioned existing issue, has carried out Improvement there is provided a kind of sludge dewatering treatment system, it is carried High sludge conveying capacity, makes the dewatering efficiency of sludge further improve, with dewatering efficiency it is high, be not easily blocked and can automatic powder The advantage of broken mud cake.

The technical scheme that the utility model is used is as follows：

A kind of sludge dewatering treatment system, including mud system, sludge dewatering system and mud cake crushing system are pushed away, pushed away by described Sludge is delivered to sludge dewatering system and carries out mud-water separation by mud system, and mud cake is formed after sludge dewatering and mud cake is fallen into and crushes system System realizes pulverization process；

The concrete structure for pushing away mud system is as follows：

Including the first charging cylinder body, the first oil cylinder is set at the charging aperture of the described first charging cylinder body, described first The output end of oil cylinder is provided for stretching into the first piston for pushing sludge raw material；The first charging cylinder body is not provided with the first oil cylinder One end extend to form tapering point, the tapering point with second charging cylinder body periphery be connected, enter in the tapering point with second The junction of material cylinder body is opened up for connecting the first discharging opening for feeding cylinder body and the second charging cylinder body, and cylinder is fed in described second Second oil cylinder is set at the charging aperture of body, and the output end of second oil cylinder is provided for stretching into and pushed the second of sludge raw material Piston；

The concrete mechanism of the sludge dewatering system is as follows：

Including frame, the liquid-phase outlet of sludge water abjection is respectively arranged in the frame and for discharging sludge Solid-phase outlet；Frame side set the first motor, the output end of first motor by transmission mechanism connected with differential, One end of pusher shaft is connected with differential mechanism and stretched into by first bearing seat in case, multiple in arranged for interval on the pusher shaft For realizing the pusher blade to sludge extrusion dehydration, passive rotating shaft through each pusher blade and with stem on pusher shaft and afterbody Pusher blade connection, the first helical blade for crushing mud cake, first spiral are also set up in the passive rotating shaft The quantity of blade is incremented by by the pusher blade of the pusher blade positioned at pusher shaft stem rearwardly；The other end of the pusher shaft is stretched Go out case and be connected with second bearing seat；Also set up rotary drum in the case, in the periphery of the pusher shaft, the rotary drum by Second motor and transmission mechanism control are rotated；

The concrete structure of the mud cake crushing system is as follows：

Including the hopper with above-mentioned solid phase outlet, in the affixed installing plate of side outer wall of the hopper, drive mechanism Be arranged on the installing plate, the output end of drive mechanism connection rotary shaft, the rotary shaft through the hopper and with positioned at The 3rd bearing seat connection of hopper opposite side outer wall, powder is provided in the inside of the hopper, in the periphery of the rotary shaft The helical blade of broken mud cake, to the rotary shaft other end be in close to the spacing of each adjoining spiral blade of bearing block one end in rotary shaft Gradually successively decrease；In the lower section of the rotary shaft, the also affixed many shakes flitch in the hopper, open up multiple on flitch in each shake The material path passed through for mud cake particle, each other each material path on adjacent shake flitch misplace each other arrangement, in each flitch that shakes Two ends, in the outer wall of the hopper also set up dither for reducing mud cake volume.

Its further technical scheme is：

The level sensor for monitoring sludge raw material material position is also set up in the outer surface of cylinder block of first oil cylinder；In institute State the outlet valve also opened up on tapering point for opening and closing discharging opening；

Angle angle of the tapering point between the bus of arbitrary diameter two-end-point is 10~15 °；The discharging opening Diameter D is no more than 10cm；

The second bearing seat is located at the opposite side of frame；The sub-material for flowing into sludge is also set up on the pusher shaft Mouthful, one end that the pusher shaft stretches out second bearing seat sets charging aperture, the charging aperture and sub-material mouthful and the second charging cylinder body Mud mouth connection；

Be further opened with overfall at the stem pusher blade of the pusher shaft, in one end of rotary drum, the case with Inner chamber body is also formed between rotary drum, the overfall is connected with inner chamber body；Sludge water is also respectively arranged in the frame The liquid-phase outlet of abjection and the solid-phase outlet for discharging sludge；

The other end of the rotary drum is tapered, and slag-drip opening is also opened up in the other end of the rotary drum；

One end of the hopper is back taper mechanism, and covering one layer along along the inner conical surface of the hopper makes mud cake not stick together In the waterproof layer of inwall, one end intake port of the hopper with back taper mechanism tapers off to the other end of hopper；

The material path is the through hole through shake flitch, and one end of the material path is the taper hole with circular conical surface；

The air inlet for the hot blast that circulates also is opened up in one end of the rotary shaft, is also opened up in the rotary shaft center Air outlet, the circulation duct for being respectively communicated with air inlet and air outlet is also opened up in the inside of the rotary shaft.

The beneficial effects of the utility model are as follows：

The utility model is simple in construction, easy to use, and the setting of tapering point can not only make the push of sludge raw material more suitable Freely, it can also reduce discharging opening diameter, it is rubbed while the diameter of discharging opening is limited when second piston is contacted with discharging opening Power is smaller, protects the service life of second piston, prevents it from wearing and tearing, and arrangement of the present utility model can be by the conveying capacity of sludge More than 30kg is promoted to, the course of conveying of sludge raw material is time saving and energy saving, substantially increases dewatering efficiency, it is to avoid need to add water in the past The tedious steps of dilution.

Sludge dewatering system can realize 24 hours dewatering operations to sludge in the utility model, its have floor space it is small, Easy to maintain and operation advantage, sets case effectively to lift the sealing property of complete machine, the setting of differential mechanism can be met not With the processing of solid content liquid, complete machine safe running performance is substantially increased, the setting of helical blade and passive rotating shaft can be by Mud cake carries out fast-crushing, and its power source is provided by pusher shaft and pusher blade, and the afterbody of rotary drum is designed to that cone type can increase The extruding force of pusher blade, greatly reduces mud extraction liquid holdup, improves solid-liquid separation efficiency.

The arrangement of bucket front back taper mechanism is easy to mud cake blanking more quick and convenient in the utility model, adjoining spiral The design of spacing can guarantee that the fast-crushing of different size mud cake particle between blade, the material path and jolting plate of the arrangement that misplaces, The arrangement of dither can make mud cake particle carry out after-treatment after single treatment, quickly reduce the body of mud cake particle Product, is made it meet subsequent treatment process, the intensity of artificial treatment mud cake is reduced using the utility model, time saving and energy saving, significantly Improve operating efficiency.

Brief description of the drawings

Fig. 1 is the structural representation of sludge dewatering system in the utility model.

Fig. 2 is to push away the structural representation of mud system in the utility model.

Fig. 3 is to push away the action schematic diagram of mud system in the utility model.

Fig. 4 is to push away the structural representation of discharging opening in mud system in the utility model.

Fig. 5 is the structural representation of mud cake crushing system in the utility model.

1st, sludge dewatering system；101st, the first motor；102nd, differential mechanism；103rd, first bearing seat；104th, overfall；105、 Pusher shaft；106th, pusher blade；107th, passive rotating shaft；108th, the first helical blade；109th, sub-material mouthful；110th, slag-drip opening；111、 Second bearing seat；112nd, charging aperture；113rd, the second motor；114th, solid-phase outlet；115th, case；116th, rotary drum；117th, liquid phase goes out Mouthful；118th, frame；

201st, the first oil cylinder；202nd, first piston；203rd, sludge raw material；204th, belt conveyor；205th, the first charging cylinder Body；2501st, level sensor；2502nd, discharging opening；2503rd, tapering point；206th, the second charging cylinder body；207th, second piston；208、 Second oil cylinder；209th, outlet valve；2091st, discharge valve；

3rd, hopper；301st, waterproof layer；4th, drive mechanism；401st, air inlet；402nd, air outlet；403rd, the second helical blade； 404th, rotary shaft；405th, 3rd bearing seat；406th, installing plate；407th, circulation duct；5th, dither；6th, flitch is shaken；601、 Material path.

Embodiment

Illustrate embodiment of the present utility model below.

A kind of sludge dewatering treatment system includes pushing away mud system, sludge dewatering system 1 and mud cake crushing system, by pushing away mud system Sludge is delivered to sludge dewatering system 1 and carries out mud-water separation by system, and mud cake is formed after sludge dewatering and mud cake crushing system is fallen into Realize pulverization process；

Shown as shown in Figure 2, Figure 3 and Figure 4, the above-mentioned concrete structure for pushing away mud system is as follows：Cylinder body 205 is fed including first, First oil cylinder 201 is set at the charging aperture of first charging cylinder body 205, is provided for stretching into the output end of the first oil cylinder 201 and pushes away Send the first piston 202 of sludge raw material 203；One end that first charging cylinder body 205 is not provided with the first oil cylinder 201 extends to form taper End 2503, tapering point 2503 is connected with the periphery of the second charging cylinder body 206, and cylinder body 206 is fed in tapering point 2503 and second Junction is opened up feeds the discharging opening 2502 that cylinder body 205 and second feeds cylinder body 206 for connecting first, and cylinder body is fed in second Second oil cylinder 208 is set at 206 charging aperture, and the output end of the second oil cylinder 208 is provided for stretching into and pushes sludge raw material 203 Second piston 207；The material position also set up in the outer surface of cylinder block of the first oil cylinder 201 for monitoring the material position of sludge raw material 203 is passed Sensor 2501；In also opening up the outlet valve 209 for opening and closing discharging opening 2502 on tapering point 2503.Above-mentioned tapering point 2503 is in office Angle angle between the bus of meaning diameter two-end-point is 10~15 °；The diameter D of discharging opening 2502 is no more than 10cm.

The concrete mechanism of sludge dewatering system 1 is as follows：

Including frame 118, the liquid-phase outlet 117 of sludge water abjection is respectively arranged in frame 118 and for discharging The solid-phase outlet 114 of sludge；First motor 101 is set in the side of frame 118, and the output end of the first motor 101 passes through transmission Mechanism connected with differential 102, one end of pusher shaft 105 is connected with differential mechanism 102 and stretches into case by first bearing seat 103 In 115, in the multiple pusher blades 106 for being used for realization to sludge extrusion dehydration of arranged for interval on pusher shaft 105, passive rotating shaft 107 run through each pusher blade 106 and are connected with the pusher blade 106 of stem and afterbody on pusher shaft 105, in passive rotating shaft 107 On also set up the first helical blade 108 for crushing mud cake, the quantity of the first helical blade 108 is by first positioned at pusher shaft 105 The pusher blade 106 of the pusher blade 106 in portion rearwardly is incremented by；The other end of pusher shaft 105 stretch out case 115 and with the second axle Bearing 111 is connected；Also set up rotary drum 116 in the case 115, in the periphery of pusher shaft 105, rotary drum 116 by the second motor 113 and Transmission mechanism control is rotated；

Second bearing seat 111 is located at the opposite side of frame 118；Point for flowing into sludge is also set up on pusher shaft 105 Material mouth 109, one end that pusher shaft 105 stretches out second bearing seat 111 sets charging aperture 112, charging aperture 112 and sub-material mouthfuls 109 and The mud mouth connection of second charging cylinder body 206.At the stem pusher blade 106 of pusher shaft 105, in one end of rotary drum 116 also Overfall 104 is offered, inner chamber body is also formed between case 115 and rotary drum 116, overfall 104 is connected with inner chamber body；In machine The liquid-phase outlet 117 of sludge water abjection and the solid-phase outlet 114 for discharging sludge are also respectively arranged on frame 118.It is above-mentioned The other end of rotary drum 116 is tapered, and slag-drip opening 110 is also opened up in the other end of rotary drum 116.

As shown in figure 5, the concrete structure of mud cake crushing system is as follows：Including exporting 114 hoppers connected with above-mentioned solid phase 3, in the affixed installing plate 406 of the side outer wall of hopper 3, drive mechanism 4 is arranged on installing plate 406, the output end of drive mechanism 4 Rotary shaft 404 is connected, rotary shaft 404 is connected through hopper 3 and with the 3rd bearing seat 405 positioned at the opposite side outer wall of hopper 3, in The inside of hopper 3, the second helical blade 403 for being provided in the periphery of rotary shaft 404 crushing mud cake, are leaned in rotary shaft 404 The spacing of each adjacent second helical blade 403 of nearly 405 one end of 3rd bearing seat is in gradually to successively decrease to the other end of rotary shaft 404； In the lower section of rotary shaft 404, the also affixed many shakes flitch 6 in hopper 3, open up multiple for mud cake on flitch 6 in each shake The material path 601 that passes through of grain, each other each material path 601 on adjacent shake flitch 6 misplace each other arrangement, shake the two of flitch 6 in each End, in the outer wall of hopper 3 also set up dither 5 for reducing mud cake volume.One end of hopper 3 is back taper mechanism, One layer is covered along along the inner conical surface of hopper 3 makes the waterproof layer 301 that mud cake can not be attached to inwall, and hopper 3 carries back taper mechanism The other end of from one end intake port to hopper 3 taper off.Material path 601 is the through hole through shake flitch 6, material path 601 one end is the taper hole with circular conical surface.The air inlet 401 for the hot blast that circulates also is opened up in one end of rotary shaft 404, The center of rotary shaft 404, which also opens up air outlet 402 and also opened up in the inside of rotary shaft 404, is respectively communicated with air inlet 401 and air-out The circulation duct 407 of mouth 402.

Specific work process of the present utility model is as follows：

Shown as shown in Figure 2, Figure 3 and Figure 4, sludge raw material 203 is conveyed into the first charging cylinder body 205 by belt conveyor 204 Inside, after the sludge raw material 203 that level sensor 2501 is monitored in the first charging cylinder body 205 reaches specified location, by outer Portion PLC controls the first oil cylinder 201 to start, and first piston 202 is moved downward sludge raw material 203 enters the by discharging opening 2502 In two charging cylinder bodies 206, the discharge valve 2091 of outlet valve 209 is always on and keeps sludge raw material in the course of conveying 203 conveying, after sludge raw material 203, which enters second, to be fed in cylinder body 206, above-mentioned first piston 202 retracts, while outlet valve 209 discharge valve 2091 is closed, while above-mentioned belt conveyor 204 continues to convey sludge raw material 203 into the first charging cylinder In body 205, then second piston 207 pushes forward sludge raw material 203 by the second charging cylinder body 206, as shown in figure 3, making dirt Mud raw material 203 enters in sludge dewatering system 1.

As shown in figure 1, power is transferred into differential mechanism 102 by transmission mechanism by the first motor 101 and pusher shaft is driven 105th, pusher blade 106, the helical blade 108 of passive rotating shaft 107 and first are rotated, and the second motor 113 is driven by transmission mechanism Rotary drum 116 rotates, and starts to after full speed and to produce powerful centrifugal force field, the upper dirt by pushing away the push of mud system by rotation Mud raw material 203 is entered by charging aperture 112 and flowed out to from sub-material mouthful 109 in rotary drum 116, in the presence of centrifugal force field, than More great solid-phase material is heavy to be attached at the inwall of rotary drum 116, by differential mechanism 102 make pusher shaft 105, pusher blade 106 with Rotary drum 116 produces a constant differential speed, and the solid phase sediment being then dehydrated is discharged from slag-drip opening 110 and solid-phase outlet 114, than The liquid phase of heavy and light is then flowed out from overfall 104, and the purpose of dehydration is reached by continuously working.Sludge is in continuous conveying mistake Cheng Zhonghui formation mud cakes, make it crush immediately when forming mud cake by the first helical blade 108 and the effect of passive rotating shaft 107, from And ensure to be not easily blocked in rotary drum 116.

As shown in figure 3, bulky grain mud cake flows out from the solid-phase outlet 114 of sludge dewatering equipment and falls into material of the present utility model In bucket 3, because the inwall of hopper 3 sets the inwall of waterproof layer 301 and hopper 3 for inclined conical surface type structure, therefore its energy Make the whereabouts of mud cake at the uniform velocity, drive mechanism 4 starts and drives rotary shaft 404 to rotate, and hot blast enters into and through stream from air inlet 401 Thread a pipe and 407 flowed out from air outlet 402, bulky grain sludge is heated and contact with the second helical blade 403 of rotation so as to be formed The particle of small volume, by the spacing between the second helical blade 403 from the one end of rotary shaft 404 to the other end in the energy that gradually successively decreases The purpose that different mud cake particles are crushed is met, the mud cake particle after single treatment is fallen on shake flitch 6, and dither 5 starts The particle on shake flitch 6 is set persistently to beat and reduce into more tiny particle and flowed out from material path 601, due to material path 601 in dislocation arrangement, therefore mud cake particle can be made to be shaken by repeat impact and fine particle is formed, and meets subsequent treatment work Make.

Above description is explained of the present utility model, is not the restriction to utility model, what the utility model was limited Scope is referring to claim, and in the case of without prejudice to basic structure of the present utility model, the utility model can make any shape The modification of formula.

Claims (9)

1. a kind of sludge dewatering treatment system, it is characterised in that：System is crushed including pushing away mud system, sludge dewatering system and mud cake System, by it is described push away mud system sludge be delivered to sludge dewatering system carry out mud-water separation, formed mud cake and to fall after sludge dewatering Enter mud cake crushing system and realize pulverization process；

The concrete structure for pushing away mud system is as follows：

Including the first charging cylinder body (205), the first oil cylinder (201) is set at the charging aperture of the described first charging cylinder body (205), It is provided for stretching into the first piston (202) for pushing sludge raw material in the output end of first oil cylinder (201)；Described first enters Material cylinder body (205) is not provided with one end of the first oil cylinder (201) and extends to form tapering point (2503), the tapering point (2503) and the The periphery connection of two charging cylinder bodies (206), use is opened up in the junction of the tapering point (2503) and the second charging cylinder body (206) The discharging opening (2502) of cylinder body (205) and the second charging cylinder body (206) is fed in connection first, cylinder body is fed in described second (206) the second oil cylinder (208) is set at charging aperture, and the output end of second oil cylinder (208) is provided for stretching into and pushed The second piston (207) of sludge raw material；

The concrete mechanism of the sludge dewatering system is as follows：

Including frame (118), the liquid-phase outlet (117) of sludge water abjection is respectively arranged in the frame (118) and is used In the solid-phase outlet (114) of discharge sludge；In the side of frame (118), the first motor (101), first motor are set (101) output end is connected simultaneously by transmission mechanism connected with differential (102), one end of pusher shaft (105) with differential mechanism (102) Stretched into by first bearing seat (103) in case (115), it is multiple for realization pair in arranged for interval on the pusher shaft (105) The pusher blade (106) of sludge extrusion dehydration, passive rotating shaft (107) through each pusher blade (106) and with pusher shaft (105) Pusher blade (106) connection of stem and afterbody, also sets up the first spiral shell for crushing mud cake in the passive rotating shaft (107) Vane piece (108), the quantity of first helical blade (108) from the pusher blade (106) positioned at pusher shaft (105) stem to The pusher blade (106) of afterbody is incremented by；The other end of the pusher shaft (105) stretches out case (115) and and second bearing seat (111) connect；Rotary drum (116), the rotary drum are also set up in the case (115), in the periphery of the pusher shaft (105) (116) rotated by the second motor (113) and transmission mechanism control；

The concrete structure of the mud cake crushing system is as follows：

Including exporting the hopper (3) that (114) are connected with above-mentioned solid phase, in the affixed installing plate of side outer wall of the hopper (3) (406), drive mechanism (4) is arranged on the installing plate (406), the output end connection rotary shaft (404) of drive mechanism (4), The rotary shaft (404) is connected through the hopper (3) and with the 3rd bearing seat (405) positioned at hopper (3) opposite side outer wall, Inside in the hopper (3), the second helical blade in the periphery of the rotary shaft (404) being provided for crushing mud cake (403), in rotary shaft (404) close to each adjacent second helical blade (403) of bearing block (405) one end spacing to rotary shaft (404) other end is in and gradually successively decreased；Lower section in the rotary shaft (404), the also affixed many shakes flitch in the hopper (3) (6), in opening up multiple material paths (601) passed through for mud cake particle on each shake flitch (6), each other on adjacent shake flitch (6) Each material path (601) misplace each other arrangement, also set up and be used in the two ends of each shake flitch (6), in the outer wall of the hopper (3) Reduce the dither (5) of mud cake volume.

2. a kind of sludge dewatering treatment system as claimed in claim 1, it is characterised in that：In first oil cylinder (201) Outer surface of cylinder block also sets up the level sensor (2501) for monitoring sludge raw material material position；In on the tapering point (2503) also Open up the outlet valve (209) for opening and closing discharging opening (2502).

3. a kind of sludge dewatering treatment system as claimed in claim 1, it is characterised in that：The tapering point (2503) is any Angle angle between the bus of diameter two-end-point is 10~15 °；The diameter D of the discharging opening (2502) is no more than 10cm.

4. a kind of sludge dewatering treatment system as claimed in claim 1, it is characterised in that：Second bearing seat (111) position Opposite side in frame (118)；The sub-material mouthful (109) for flowing into sludge is also set up on the pusher shaft (105), it is described to push away Expect that axle (105) stretches out one end setting charging aperture (112) of second bearing seat (111), the charging aperture (112) and sub-material mouthful (109) and second charging cylinder body (206) mud mouth connection.

5. a kind of sludge dewatering treatment system as claimed in claim 1, it is characterised in that：Head in the pusher shaft (105) Portion's pusher blade (106) place, in one end of rotary drum (116) overfall (104) is further opened with, in the case (115) and rotary drum (116) inner chamber body is also formed between, the overfall (104) connects with inner chamber body；Also set respectively in the frame (118) The liquid-phase outlet (117) deviate from for sludge water and the solid-phase outlet (114) for discharging sludge.

6. a kind of sludge dewatering treatment system as claimed in claim 1, it is characterised in that：The other end of the rotary drum (116) It is tapered, also open up slag-drip opening (110) in the other end of the rotary drum (116).

7. a kind of sludge dewatering treatment system as claimed in claim 1, it is characterised in that：One end of the hopper (3) is Cone mechanism, one layer of covering makes the waterproof layer (301) that mud cake can not be attached to inwall, institute along along the inner conical surface of the hopper (3) The other end for stating one end intake port to hopper (3) of the hopper (3) with back taper mechanism tapers off.

8. a kind of sludge dewatering treatment system as claimed in claim 1, it is characterised in that：The material path (601) be through The through hole of flitch (6) is shaken, one end of the material path (601) is the taper hole with circular conical surface.

9. a kind of sludge dewatering treatment system as claimed in claim 1, it is characterised in that：The one of the rotary shaft (404) End also opens up the air inlet (401) for the hot blast that circulates, and air outlet (402) is also opened up in the rotary shaft (404) center, The inside of the rotary shaft (404) also opens up the circulation duct (407) for being respectively communicated with air inlet (401) and air outlet (402).