CN213887387U - Quick belt cleaning device of rice, wheat seed - Google Patents

Abstract

The utility model provides a quick cleaning device for rice and wheat seeds, which comprises a shell, wherein the upper end of the shell is provided with a feed opening, a first filter screen is arranged in the shell, the outer wall of the shell is provided with a vibrating motor, and a conveyer belt is arranged below the outlet of the shell; the discharge end of the conveying belt extends into the cleaning box, a sliding block which is driven by a second power mechanism to move left and right is arranged in the cleaning box, a first motor is arranged on the sliding block, and the output end of the first motor is connected with a rotating rod with intensive cleaning brushes; the bottom of the cleaning box is communicated with a drying box through a second water outlet pipe with a second switch valve, a third motor is arranged at the top in the drying box, the output end of the third motor is connected with a rotating shaft, a separation net is arranged on the rotating shaft, and a water outlet of the second water outlet pipe is arranged above the separation net. The utility model can sieve the seeds and fully clean the seeds, and can also dry the cleaned seeds; the whole process has high automation degree and high working efficiency.

Description

Quick belt cleaning device of rice, wheat seed

Technical Field

The utility model relates to the technical field of agricultural machinery, in particular to quick belt cleaning device of rice, wheat seed.

Background

In the processing of crops, particularly in the processing of rice and wheat seeds, the quality of the seeds is directly related to the plants cultivated in the later period, the cleaning degree of the seeds directly influences the quality of the seeds, the cleanliness of the seeds is improved by adopting a cleaning mode at present, the seeds are manually cleaned by a traditional seed cleaning method in a water tank, the cleaning mode is high in labor intensity and low in working efficiency, and the cleaning quality of the seeds is difficult to guarantee. The existing cleaning device can clean seeds, but has poor cleaning effect and cannot dry the cleaned seeds.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving one of the above technical problems in the related art to at least a certain extent, therefore, the utility model provides a quick cleaning device for rice and wheat seeds, which divides the seeds into screens through a dividing and screening mechanism and recovers the generated dust, fully cleans the seeds through a cleaning mechanism, removes the bad seeds, and can dry the cleaned seeds; the whole process has high automation degree and high working efficiency.

The technical scheme of the utility model is realized like this:

a quick cleaning device for rice and wheat seeds comprises a screening mechanism and a cleaning mechanism, wherein the screening mechanism comprises a shell, a feed opening is formed in the upper end of the shell, a plurality of first filter screens are arranged in the shell at intervals from top to bottom, a vibration motor is arranged on the outer wall of the shell, and a conveying belt is arranged right below an outlet at the lower end of the shell; the cleaning mechanism comprises a cleaning box, the discharge end of the conveying belt extends into the cleaning box, a sliding block is arranged in the cleaning box, a first motor is arranged on the sliding block, the output end of the first motor is connected with a rotating rod, intensive cleaning brushes are arranged on the rotating rod, and the sliding block is driven by a second power mechanism to move left and right; the bottom of the cleaning box is communicated with a drying mechanism through a second water outlet pipe, a second switch valve is arranged on the second water outlet pipe, the drying mechanism comprises a drying box, a third motor is arranged at the top in the drying box, the output end of the third motor is connected with a rotating shaft, a plurality of separation nets are arranged on the rotating shaft, and water outlets of the second water outlet pipes are arranged above the separation nets.

Further, the second power mechanism comprises a second motor, the output end of the second motor is connected with a driving wheel, the driving wheel is connected with a driven wheel through a belt, and the driven wheel is coaxially connected with a cam; a pushing rod is arranged on one side, facing the cam, of the sliding block, and the other end of the pushing rod extends out of the cleaning box and abuts against the cam; wash the case orientation one side of cam is provided with the connecting block, the inside of connecting block is provided with the mounting groove, the catch bar epirelief is equipped with the round platform, the cover is equipped with the spring on the catch bar, the one end butt of spring in the inner wall of mounting groove, the other end butt of spring in the round platform.

Furthermore, the number of the separation nets is three, the three separation nets are arranged on the rotating shaft at intervals along the vertical direction, and the outer edge of the upper end of each separation net is provided with a surrounding edge; the second water outlet pipe is communicated with third branch pipes with the same number as the separation nets, and each third branch pipe extends into the drying box and is arranged above the corresponding separation net.

Furthermore, an electric heating tube is arranged on the inner wall of the drying box in an encircling mode, the electric heating tube is electrically connected with a power supply, a third switch and a bimetallic strip temperature switch are connected in series on a circuit between the electric heating tube and the power supply, and the bimetallic strip temperature switch is used for being disconnected or closed according to the temperature in the drying box.

The washing machine further comprises a water supply tank, the water supply tank is communicated with the washing tank through a water supply pipe, and a first water pump is arranged in the water supply tank; the drying box is communicated with the water supply box through a fourth water outlet pipe.

Furthermore, a purified water tank is arranged between the drying tank and the water supply tank, an adsorption layer, a purified water layer and a reverse osmosis layer are arranged in the purified water tank from top to bottom, the adsorption layer is made of activated carbon, the purified water layer is made of filter cotton, and the reverse osmosis layer is made of reverse osmosis membrane; the fourth outlet pipe communicates the drying box with the water purification box, and the water purification box is communicated with the water supply tank through a fifth outlet pipe.

Furthermore, a first water outlet pipe is arranged at the upper end of the side wall of the cleaning box, a first switch valve is arranged on the first water outlet pipe, the water outlet end of the first water outlet pipe is communicated with a collecting box, a sliding groove is arranged on the inner wall of the collecting box, a second filter screen is inserted in the sliding groove, and one end of the second filter screen extends out of the collecting box and is fixedly connected with a handle; the lower end of the collecting box is communicated with the water purifying tank through a sixth water outlet pipe.

Furthermore, the inside of wasing the case is provided with liquid level detector, go up liquid level detector electricity and be connected with the controller, the controller control first water pump.

Further, the upper end of the shell is also provided with an exhaust fan, and the other end of the exhaust fan is also communicated with a waste collection box.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a set up and divide the sieve mechanism, will wait that abluent seed drops into the casing from the dog-house, the seed passes through the branch sieve of first filter screen in proper order under vibrating motor's vibration effect for the seed that finally falls to the conveyer belt is not stained with together, realizes the preliminary treatment to the seed; then, the conveying belt conveys the seeds primarily treated by the screening mechanism to a cleaning box, then a first motor is started to drive a rotating rod to rotate, so that the cleaning brush stirs and cleans the seeds, and a second power mechanism drives a sliding block to move left and right in a reciprocating manner in the process that the first motor drives the rotating rod to rotate, so that the rotating rod and the cleaning brush move left and right in a reciprocating manner, and the seeds are fully cleaned; after the stirring is washd and is accomplished and treat that the surface of water in the washing incasement is stable, normal plump seed can sink at the bottom, opens the second ooff valve, and seed and water can get into the stoving incasement through the second outlet pipe, because the delivery port setting of second outlet pipe is in the top of spacer screen, therefore the spacer screen can separate water and seed, and the seed can obtain the stoving collection in the stoving case afterwards, avoids the moisture on the seed too much, leads to appearing rotting. The whole process has high automation degree and high working efficiency.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is an enlarged schematic view at A in FIG. 1;

FIG. 3 is an enlarged schematic view at B of FIG. 1;

FIG. 4 is a schematic view of an assembly structure of the cleaning mechanism and the second power mechanism of FIG. 1;

fig. 5 is a schematic structural diagram of a drying mechanism in an embodiment of the present invention;

FIG. 6 is a schematic structural view of a water purifying tank according to an embodiment of the present invention;

fig. 7 is a schematic diagram of the electrical connection between the electrical heating tube and the power source in the embodiment of the present invention.

Reference numerals:

110 shell, 120 feed inlet, 130 first filter screen, 140 vibrating motor, 150 conveyer belt, 160 exhaust fan, 170 waste collecting box;

210 cleaning box, 211 upper liquid level detector, 220 sliding block, 230 first motor, 240 rotating rod, 241 cleaning brush, 250 second water outlet pipe, 251 second switch valve, 252 third branch pipe, 260 pushing rod, 261 round table, 270 connecting block, 271 installing groove, 280 spring, 290 first water outlet pipe and 291 first switch valve;

310 drying box, 320 third motor, 330 rotating shaft, 340 separating net, 341 surrounding edge, 350 electric heating pipe, 360 power supply, 370 third switch, 380 bimetallic strip temperature switch and 390 fourth water outlet pipe;

410 a second motor, 420 a driving wheel, 430 a belt, 440 a driven wheel and 450 a cam;

510 a water supply tank, 520 a water supply pipe, 530 a first water pump;

a clean water tank 610, an adsorption layer 620, a clean water layer 630, a reverse osmosis layer 640 and a fifth water outlet pipe 650;

710 collecting box, 711 chute, 720 second filter screen, 730 handle, 740 sixth outlet pipe.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the positional or orientational descriptions, such as "upper", "lower", "front", "rear", "left", "right", etc., are referred to the positional or orientational relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, if there is any description of "first", "second", etc., it is only for the purpose of distinguishing technical features, and it is not understood that relative importance is indicated or implied or that the number of indicated technical features is implicitly indicated or that the precedence of the indicated technical features is implicitly indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 to 5, according to the utility model discloses a quick belt cleaning device of rice, wheat seed that embodiment provided, including dividing sieve mechanism and wiper mechanism, divide sieve mechanism including casing 110, the upper end of casing 110 is provided with dog-house 120, be provided with a plurality of first filter screens 130 from last interval down in the casing 110, be provided with vibrating motor 140 on the casing 110 outer wall. The vibration motor 140 is used for driving the first filter 130 to vibrate, and a conveyor belt 150 is arranged right below the lower outlet of the housing 110; the cleaning mechanism comprises a cleaning box 210, the discharge end of the conveying belt 150 extends into the cleaning box 210, a sliding block 220 is arranged in the cleaning box 210, a first motor 230 is arranged on the sliding block 220, the output end of the first motor 230 is connected with a rotating rod 240, intensive cleaning brushes 241 are arranged on the rotating rod 240, and the sliding block 220 is driven by a second power mechanism to reciprocate left and right; the bottom of the cleaning box 210 is communicated with a drying mechanism through a second water outlet pipe 250, the second water outlet pipe 250 is provided with a second switch valve 251, the drying mechanism comprises a drying box 310, the top of the inside of the drying box 310 is provided with a third motor 320, the output end of the third motor 320 is connected with a rotating shaft 330, the rotating shaft 330 is provided with a plurality of separating nets 340, and the water outlets of the second water outlet pipe 250 are arranged above the separating nets 340. Compared with the prior art, the embodiment of the utility model has the advantages that the seeds to be cleaned are thrown into the shell 110 from the feed opening 120 through the screening mechanism, and the seeds sequentially pass through the screening of the first filter screen 130 under the vibration action of the vibration motor 140, so that the seeds finally falling onto the conveyer belt 150 are not stuck together, and the primary treatment of the seeds is realized; then, the conveyer belt 150 conveys the seeds primarily treated by the screening mechanism to the washing tank 210, then the first motor 230 is started to drive the rotating rod 240 to rotate, so that the washing brush 241 stirs and washes the seeds, and in the process that the first motor 230 drives the rotating rod 240 to rotate, the second power mechanism drives the sliding block 220 to reciprocate left and right, so that the rotating rod 240 and the washing brush 241 reciprocate left and right, and further the seeds are sufficiently washed; after the stirring is washd and is accomplished and treat the surface of water in the washing case 210 stable, normal plump seed can sink at the bottom, opens second ooff valve 251, and seed and water can get into stoving case 310 through second outlet pipe 250 in, because the delivery port setting of second outlet pipe 250 is in the top of separation net 340, consequently separation net 340 can separate water and seed, and the seed can be dried in stoving case 310 afterwards and collected, avoids the moisture on the seed too much, leads to appearing rotting. The whole process has high automation degree and high working efficiency.

As shown in fig. 1, 2 and 4, in some embodiments of the present invention, the second power mechanism includes a second motor 410, an output end of the second motor 410 is connected to a driving wheel 420, the driving wheel 420 is connected to a driven wheel 440 through a belt 430, and the driven wheel 440 is coaxially connected to a cam 450; a pushing rod 260 is arranged on one side of the sliding block 220 facing the cam 450, and the other end of the pushing rod 260 extends out of the cleaning box 210 and abuts against the outer peripheral surface of the cam 450; wash case 210 orientation one side of cam 450 is provided with connecting block 270, the inside of connecting block 270 is provided with the mounting groove 271, the catch bar 260 epirelief is equipped with the round platform 261, the cover is equipped with spring 280 on the catch bar 260, the one end butt of spring 280 in the inner wall of mounting groove 271, the other end butt of spring 280 in the round platform 261. In the cleaning process, the second motor 410 is started, the rotation of the cam 450 drives the pushing rod 260 to reciprocate left and right, so that the sliding block 220 is driven to reciprocate left and right, the rotating rod 240 and the cleaning brush 241 are driven to move left and right while rotating, and the seeds are sufficiently cleaned. The embodiment of the present invention provides a spring 280, the spring 280 makes the pushing rod 260 always abut against the outer peripheral surface of the cam 450, and ensures that the pushing rod 260 reciprocates once when the cam 450 rotates the round.

As shown in fig. 1 and 5, in some embodiments of the present invention, there are three separation nets 340, three separation nets 340 are spaced apart from each other in the vertical direction on the rotating shaft 330, and a peripheral edge 341 is provided at an outer edge of an upper end of each separation net 340; the second water outlet pipe 250 is communicated with third branch pipes 252 with the same number as the separation nets 340, and each third branch pipe 252 extends into the drying box 310 and is arranged above the corresponding separation net 340. By the arrangement, the cleaned seeds can be divided into a plurality of parts and placed on the corresponding separation nets 340 respectively for drying, and the separation nets 340 can rotate around the shafts under the driving of the second motor 410, so that the accumulation of the seeds can be effectively avoided, and the drying effect is further improved. Through being provided with surrounding edge 341 in the outward flange of every separation net 340 upper end, because separation net 340 can give the centrifugal force of seed at the rotation in-process, surrounding edge 341 can play the effect of separation, avoids partial seed to throw away under the effect of centrifugal force and glues on the inner wall of stoving case 310.

As shown in fig. 5 and 7, in some embodiments of the present invention, an electric heating tube 350 is surrounded on an inner wall of the drying box 310, the electric heating tube 350 is electrically connected to a power source 360, a third switch 370 and a bimetal temperature switch 380 are connected in series on a circuit between the electric heating tube 350 and the power source 360, and the bimetal temperature switch 380 is configured to be opened or closed according to a temperature in the drying box 310. The cleaned seeds enter the drying box 310 through the second water outlet pipe 250 along with water, the separation net 340 separates the seeds from the water, so that the seeds are kept on the separation net 340, and in the process of heating by electrifying the electric heating pipe 350, the second motor 410 drives the separation net 340 to rotate through the rotating shaft 330, so that the seeds are dried better; the bimetallic strip temperature switch 380 can detect the temperature in the drying box 310 in real time, and when the temperature in the drying box 310 is too high, the bimetallic strip temperature switch 380 is automatically disconnected, so that the electric heating pipe 350 stops heating; when the temperature in the drying box 310 is lower than the set value, the bimetallic strip temperature switch 380 is automatically closed, so that the electric heating pipe 350 is electrified and heated; so that the temperature in the drying box 310 is maintained in a proper temperature range, and it is ensured that the seeds are not damaged on the basis of drying the seeds.

As shown in fig. 1, in some embodiments of the present invention, the cleaning apparatus further includes a water supply tank 510, the water supply tank 510 is connected to the cleaning tank 210 through a water supply pipe 520, and a first water pump 530 is disposed in the water supply tank 510; the drying box 310 is communicated with the water supply box 510 through a fourth water outlet pipe 390. The water in the water supply tank 510 can be timely supplied to the washing tank 210 through the water supply pipe 520, and the continuity of the washing work can be ensured.

As shown in fig. 1 and 6, preferably, a purified water tank 610 is disposed between the drying tank 310 and the water supply tank 510, an adsorption layer 620, a purified water layer 630 and a reverse osmosis layer 640 are disposed in the purified water tank 610 from top to bottom, the adsorption layer 620 is made of activated carbon, the purified water layer 630 is made of filter cotton, and the reverse osmosis layer 640 is made of reverse osmosis membrane; the fourth water outlet pipe 390 is connected to the drying box 310 and the clean water tank 610, and the clean water tank 610 is connected to the water supply tank 510 through a fifth water outlet pipe 650. Through the purification subassembly of constituteing by water purification case 610, adsorbed layer 620, water purification layer 630 and reverse osmosis layer 640 can purify the sewage of discharging from stoving case 310 and carry supply tank 510 again, realize the reuse of water, reduce the water consumption, the water economy resource.

As shown in fig. 1, 3 and 4, it is further preferable that a first water outlet pipe 290 is disposed at an upper end of a side wall of the cleaning tank 210, a first switch valve 291 is disposed on the first water outlet pipe 290, a water outlet end of the first water outlet pipe 290 is communicated with the collecting tank 710, a sliding groove 711 is disposed on an inner wall of the collecting tank 710, a second filter screen 720 is inserted into the sliding groove 711, and one end of the second filter screen 720 extends out of the collecting tank 710 and is fixedly connected with a handle 730; the lower end of the collecting tank 710 is communicated with the purified water tank 610 through a sixth water outlet pipe 740. After the seeds are stirred and cleaned and the water level in the tank 210 to be cleaned is stable, the shriveled seeds and other impurities float on the water surface, and the normal and full seeds sink at the water bottom, so that after the first switch valve 291 is opened, the shriveled seeds and other impurities are discharged into the collecting tank 710 from the first water outlet pipe 290 along with the water at the upper end, the shriveled seeds and other impurities are separated from the water by the second filter screen 720, the shriveled seeds and other impurities are adsorbed on the second filter screen 720, the separated sewage enters the water purifying tank 610 through the sixth water outlet pipe 740 to be purified and then recovered into the water supply tank 510 for recycling, and further water resources are saved; when the amount of the shriveled seeds and the rest of the impurities accumulated in the second filter 720 is sufficient, the second filter 720 can be drawn out by the drawing handle 730 to be cleaned or replaced, and the use is convenient.

As shown in fig. 4, preferably, an upper liquid level detector 211 is disposed inside the cleaning tank 210, and the upper liquid level detector 211 is electrically connected to a controller (not shown), and the controller controls the first water pump 530. When the water supply pipe 520 supplies water into the washing tank 210 until the liquid level rises to a position where the upper liquid level detector 211 is triggered, the upper liquid level detector 211 transmits a signal to the controller, and the controller controls the first water pump 530 to stop working, thereby ensuring that the amount of water added into the washing tank 210 is within an appropriate range. It should be noted that the controller is a controller with model number DSE 8660.

As shown in fig. 1, in some embodiments of the present invention, an exhaust fan 160 is further disposed at the upper end of the housing 110, and the other end of the exhaust fan 160 is further communicated with a waste collecting box 170. Because the first filter screen 130 can generate dust in the process of screening the seeds under the driving of the vibration motor 140, and some empty seeds may exist in the seeds to be cleaned, in the screening process, the dust generated by the seed screening and some empty seeds can be effectively and sufficiently pumped into the waste collecting box 170 to be collected by starting the exhaust fan 160, so that the primary treatment of the seeds is realized.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A quick cleaning device for rice and wheat seeds is characterized by comprising a screening mechanism and a cleaning mechanism, wherein the screening mechanism comprises a shell, a feed opening is formed in the upper end of the shell, a plurality of first filter screens are arranged in the shell at intervals from top to bottom, a vibration motor is arranged on the outer wall of the shell, and a conveying belt is arranged right below an outlet at the lower end of the shell; the cleaning mechanism comprises a cleaning box, the discharge end of the conveying belt extends into the cleaning box, a sliding block is arranged in the cleaning box, a first motor is arranged on the sliding block, the output end of the first motor is connected with a rotating rod, intensive cleaning brushes are arranged on the rotating rod, and the sliding block is driven by a second power mechanism to move left and right; the bottom of the cleaning box is communicated with a drying mechanism through a second water outlet pipe, a second switch valve is arranged on the second water outlet pipe, the drying mechanism comprises a drying box, a third motor is arranged at the top in the drying box, the output end of the third motor is connected with a rotating shaft, a plurality of separation nets are arranged on the rotating shaft, and water outlets of the second water outlet pipes are arranged above the separation nets.

2. The quick cleaning device for the rice and wheat seeds as claimed in claim 1, wherein the second power mechanism comprises a second motor, the output end of the second motor is connected with a driving wheel, the driving wheel is connected with a driven wheel through a belt, and the driven wheel is coaxially connected with a cam; a pushing rod is arranged on one side, facing the cam, of the sliding block, and the other end of the pushing rod extends out of the cleaning box and abuts against the cam; wash the case orientation one side of cam is provided with the connecting block, the inside of connecting block is provided with the mounting groove, the catch bar epirelief is equipped with the round platform, the cover is equipped with the spring on the catch bar, the one end butt of spring in the inner wall of mounting groove, the other end butt of spring in the round platform.

3. The quick cleaning device for rice and wheat seeds as claimed in claim 1, wherein there are three separating nets, the three separating nets are arranged on the rotating shaft at intervals along the vertical direction, and the outer edge of the upper end of each separating net is provided with a surrounding edge; the second water outlet pipe is communicated with third branch pipes with the same number as the separation nets, and each third branch pipe extends into the drying box and is arranged above the corresponding separation net.

4. The rapid cleaning device for rice and wheat seeds as claimed in claim 1, wherein an electric heating tube is surrounded on the inner wall of the drying box, the electric heating tube is electrically connected with a power supply, a third switch and a bimetallic strip temperature switch are connected in series on a circuit between the electric heating tube and the power supply, and the bimetallic strip temperature switch is used for opening or closing according to the temperature in the drying box.

5. The rapid cleaning device for rice and wheat seeds as claimed in claim 1, further comprising a water supply tank, wherein the water supply tank is connected to the cleaning tank through a water supply pipe, and a first water pump is arranged in the water supply tank; the drying box is communicated with the water supply box through a fourth water outlet pipe.

6. The rapid cleaning device for rice and wheat seeds as claimed in claim 5, wherein a clean water tank is arranged between the drying tank and the water supply tank, an adsorption layer, a clean water layer and a reverse osmosis layer are arranged in the clean water tank from top to bottom, the adsorption layer is made of activated carbon, the clean water layer is made of filter cotton, and the reverse osmosis layer is made of reverse osmosis membrane; the fourth outlet pipe communicates the drying box with the water purification box, and the water purification box is communicated with the water supply tank through a fifth outlet pipe.

7. The quick cleaning device for rice and wheat seeds as claimed in claim 6, wherein a first water outlet pipe is arranged at the upper end of the side wall of the cleaning box, a first switch valve is arranged on the first water outlet pipe, the water outlet end of the first water outlet pipe is communicated with a collecting box, a chute is arranged on the inner wall of the collecting box, a second filter screen is inserted in the chute, and one end of the second filter screen extends out of the collecting box and is fixedly connected with a handle; the lower end of the collecting box is communicated with the water purifying tank through a sixth water outlet pipe.

8. The quick cleaning device for rice and wheat seeds as claimed in claim 5, wherein an upper liquid level detector is arranged inside the cleaning tank, the upper liquid level detector is electrically connected with a controller, and the controller controls the first water pump.

9. The quick cleaning device for rice and wheat seeds as claimed in claim 1, wherein an exhaust fan is further disposed at the upper end of the casing, and a waste collection box is further communicated with the other end of the exhaust fan.

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