CN1947865A - Mixed sieving method for utilizing domestic garbage as combustion energy, and polygonal drum broken bag sieving machine - Google Patents

Abstract

A mixing-screening method for making the life garbage to become combustible energy source and a multi-corner drum type bag-breaking and screening machine are disclosed. Multiple said multi-corner drum type bag-breaking and screening machines are sequentially connected to become a mixing-screening stream line to increase the caloricity of life garbage by 1-3 times to make it to become a true energy source.

Description

Make house refuse become the nixing sieve separating method and the polygonal drum broken bag screening machine of combustion energy

Technical field

The invention belongs to a kind of garbage treating process and device, relate in particular to a kind of nixing sieve separating method and polygonal drum broken bag screening machine that makes house refuse become combustion energy, it is energy saving technique before the consumer waste incineration and the energy-conserving and environment-protective equipment of eliminating bioxin.

Background technology

China's house refuse produced 1.6 hundred million tons in 2005, account for 32% of the world, the whole nation has 2/3 city to be surrounded by rubbish in 688 cities, big and medium-sized cities, the whole nation have 575 garbage disposal plants (factory), the garbage disposal rate reaches 49.7%, and a large amount of small and medium-sized cities and samll cities and towns do not have waste treatment facility substantially.70 of the garbage burning factories in the whole nation day are handled 16511 tons, account for garbage treatment quantity 6.9%, and the developing steps of waste incineration at present strengthen, and burning disposal ability in 2003 is 6 times in 2000, gives meter and has bigger development in five to ten years from now on.

The many urban population density height in Deposits in Eastern Coastal China area, land resource is very valuable, has had 1/4 city can not supply garbage loading embeading with having." waste incineration " handled, and will develop into the main trend of coastal region in east China garbage disposal.

China introduces the external advanced waste incineration and generating electricity equipment of many families, work well abroad and favorable economic benefit is arranged, but have difficulty in taking a step at home, all rely on great number charge or great number government subsidy to keep operation, its basic reason is that China's house refuse and American-European developed country house refuse are formed in that there were significant differences on the quality and quantity.

" waste incineration " is owing to the quantity of refuse that China's house refuse has the calorific value formation is little, calorific value is too low, as low heat valve only is 1000-1500KCal/kg, and the rubbish of a large amount of heat dissipations is many, many as kitchen organic matter (water), lime-ash silt (slurry) is many, the moisture content height, so must replenish a large amount of auxiliary fuels during waste incineration, as fuel oil and coal, could move, and expensive fuel, price constantly rises, and causes the processing cost of burning away the refuse high, become the financial burden of governments at all levels, make China's waste incineration be difficult to large-scale popularization for a long time.

The one, China's level of economic development and GDP per capita all are in the economics of underdevelopment level, and American-European western countries then are in developed country's economic level, so rubbish constitutes the product that objectively reflects two kinds of different stages of economic development.High heating value rubbish in China's house refuse, as plastics, rubber, leather, textile fabric, paper, bamboo and wood material etc., quantity is also few, low heat valve only is 1000-1570KCal/kg (Beijing, Shanghai, Shenzhen), and high heating value rubbish quantity is more in American-European countries's house refuse, low heat valve reaches 2800-3350KCal/kg (American and Britain, day), exceeds more than two times than China.

The 2nd, China's house refuse is based on (plastics) packed composting, and sorting rubbish is still in the experiment and demonstration stage, and west American-European countries is based on sorting rubbish.

The 3rd, China's domestic waste is collected from the source, to transhipment, arrive garbage disposal again, formed to choose rubbish family and the industrial chain that rubbish is made a living, they have the resource rubbish that high heating value is worth with major part, be that most combustiblerefuses sort away, convert to be worth and reclaim and utilize.

The 4th, the greatest differences of the cooking culture life habit in east and western diet culture life habit makes two kinds of house refuses constitute the difference that has on the quality and quantity.China's house refuse formation has three high one low characteristics: a height is a garbage ratio height, and two height are lime-ash, silt, masonry, pottery, glass ratio height, and three height are moisture content height; One low be that to have the rubbish ratio of calorific value few, low heat valve is low.The western developed country house refuse constitutes and to have three low one high characteristics: one low be that garbage quantity is low, two low be that lime-ash silt ratio is low, three low be that water content is low; One height is the rubbish low heat valve height with calorific value.

The fundamental difference of China's house refuse and western developed country house refuse is:

One height is the deal height that garbage accounts for house refuse, reaches 42.7-51.26%, Shanghai 42.7%, and Beijing 49.77%, Shenzhen 51.26% is up to 66.81%.And the western developed country garbage is 6-27%, the mean value of the U.S. is 12%, and than low 30-39 percentage point of China three big cities, China's garbage accounts for half of house refuse gross mass, higher more than 2 times than developed country, the low one of the main reasons of China's house refuse calorific value that Here it is.

Two height are lime-ash, silt, masonry, pottery, glass ratio height, contain many silts and lime-ash in China's garbage, and the silt that enters in refuse collection, scale removal process accounts for house refuse 13-30%, is up to 36%.Through measuring and calculating lime-ash, silt account for garbage amount be 50-60% to the maximum, and organic matter is living beings residual body only accounts for 40-45%, this is the basal conditions in combustion gas district, China three big city, coal-fired district is then higher; And lime-ash silt only is 7% in the house refuse of North America, and China's lime-ash silt exceeds doubly a lot of than the North America, lime-ash silt height, then suction is many, and consumption of calorie is many during burning, and slag ash content discharge capacity is big, increase processing cost, this be China's house refuse caloric value low former therefore two.

Three height are moisture content height, and garbage is a large amount of moisture content up to 80-90% because of living beings contain, so garbage content height, the house refuse water content increases naturally, and China's house refuse water content is 45-60%, is up to 83.2%, and the U.S. only is 25%, and China is higher more than 1 times than the U.S..

The main cause that moisture content is high have one be summer and autumn melon and fruit go on the market in a large number, increase the house refuse water content; The 2nd, in rainy season, moisture content increases in the particularly southern domestic waste, is up to 65%.The 3rd, house refuse is carried out anaerobic fermentation immediately once heap, produces saprophytic water (leakage water), and pilling up time is longer, and saprophytic water the more.

Moisture content is very big to the waste incineration process influence, and the moisture content in most of rubbish need remove in advance, and transpiring moisture need to consume a large amount of valuable heat energy, this be China's house refuse caloric value low former therefore three.

Water content is excessive in the house refuse, causes rubbish ignition lag, makes combustion process undesired.

Garbage is many more in the house refuse, water content is just many more, and the dust and sand content of carrying secretly is also many more, and then the house refuse caloric value is low more, moisture content heat absorption evaporation moisture content chargeable heat can be many more, more unfavorable to the incinerator burning, form " unable to make ends meet " the heat imbalance, must replenish a large amount of auxiliary fuels, heat energy ability balance, incinerator could run well, and this is the present situation of China's house refuse.

Otherwise, garbage is few more in the house refuse, water content is just few more, the dust and sand content of carrying secretly is also few more, and then the house refuse caloric value is high more, and house refuse becomes a kind of energy, help the incinerator burning more, send more generated energy, therefore, developed country house refuse as a kind of " energy ".

In a word, owing to three high one of China's house refuse low characteristics, make China's house refuse can't become a kind of " energy " in present stage.

In addition; domestic and international sieving garbage order " from fine to coarse "; as Spain's technology and the patent CN20724430 of Shanghai environmental sanitation design and research institute or " from coarse to fine " in garbage disposal plant, Zun Yi, as the Kweiyang environmental sanitation machinery patent CN20830760 of repair plant, simple screening order can not meet the needs of.

Have again, in the domestic garbage mixing sieving technology, the present situation of conventional rollers sieve and belt feeder is: in house refuse screening sorting process technology, domestic and international successively used have vibratory sieve, uniform thickness sieve, flip-flow screening machine, probability screen, rotary screen or the like, because rotary screen can adapt to complicated domestic rubbish disposal, at home and abroad still using at present.

The conventional rollers sieve exists major defect for a long time, and the one, screening efficiency is low, can only reach 45-60%, causes the screening separating effect not good, can't implement sieve; The 2nd, easily stop up sieve aperture; The 3rd, volume is big, and the consumption metal material is many etc., and this ancient conventional screen subset is eliminated away from the screening machine field of numerous metals and nonmetallic materials.Though in use, rotary screen screening house refuse screening efficiency is low in domestic rubbish disposal, susceptible to plugging major defect has hampered its and has further extensively promoted and use.

(1) major parameter and the performance of traditional rotary screen extension set are analyzed:

(1) screening efficiency is low: 45-60%, easily stop up sieve aperture; (2) rotating speed is low: 12-18 rev/min;

(3) turn over that to throw number of times few: house refuse is turned in the screen drum body and is thrown number of times and have only 5-10 time;

(4) material time of staying in the screen drum body is short:＜30 seconds; (5) high inclination-angle: 4 °-7 °, the most frequently used is 5 °; (6) long screen drum body; (7) the big heaviness of volume, it is many to consume material (metal).

With Ф 1.5 barrel dliameters commonly used both at home and abroad is example, to existing rotary screen parameter and technical performance are analyzed the low basic reason of rotary screen screening efficiency both at home and abroad.

Use parameter both at home and abroad always

Sequence number	Barrel dliameter (m)	The inclination angle	Rotating speed rev/min	Tube length (m)	The time of staying (s)	The upset number of times
							Economical	Ф1.5	5°	15	4.61	22.19	5.54

	Ф1.5	5°	18	4.61	18.5	5.6
							Ф1.5	5°	27	4.61	12.53	5.64
	Extended type	Ф1.5	5°	27	6	16.3							7.34
Ф1.5							5°	18	6	24.11	7.24
		Ф1.5	5°	15	6	28.9						7.225

1, first group of L/D of barrel dliameter Ф 1.5m is 3.07, and tube length 4.61m is economical,

Second group of L/D is 4, tube length 6m extended type,

Big inclination angle: the inclination angle is 4-7 ° both at home and abroad, selects 5 °,

(1) screening efficiency is still too low, has only 45-60%, is the common defective that exists of conventional rollers sieve.

(2) time of staying is short, rotating speed is 15 rev/mins, be domestic normal revolution, find out, though low 15 rev/mins of rotating speed from first group parameter, the time of staying reaches 22.19 seconds most in cylinder, rotating speed is the highest 27 rev/mins, the time of staying the shortest only is 12.53 seconds in cylinder, differs nearly 10 seconds, what the house refuse time of staying was the longest has only 22.19 seconds, and the time of staying is too short.

(3) turn over the throwing number of times very little, rotary screen is the rotating speed height no matter, Ф 1.5m turns over that to throw number of times basic identical, and rotating speed is high turns over that to throw number of times slightly high, though three kinds of different rotating speeds are arranged, but three kinds are turned over that to throw number of times basic identical, throw number of times and double even turn over, and reach 10-15 time and turn over throwing, turn over and throw number of times still very little, therefore also basically identical of three kinds of rotating speed screening efficiencies.

2, two groups of parameters are compared

Second group because rotary screen is lengthened to 6m, increases approximately 25%, and other parameter does not become.

(1) though the time of staying increases to some extent, increase by 7 seconds, about 25%, still too short, be increased to 29 seconds by 22.19 seconds as time of staying of 15 rev/mins of revolutions.

(2) though turn over and throw number of times and increase to some extent, be increased to 7.34 times by 5.54 times, turn over the throwing number of times still very little.

(3) screening efficiency improves limitedly, though slightly improve than first group, screening efficiency is still very low, has only 45-60%.

Find out thus by traditional method and have only further growth screen drum body length, could prolong the time of staying of house refuse in rotary screen, only this a kind of method improves screening efficiency, the rotary screen volume is further increased, metal material consumption increases, heavy more, transportation is difficulty more, obviously is not optimal selection.

(2) belt conveyer of domestic standard design is difficult to satisfy the needs of " nixing sieve point-score ", do not fit into house refuse yet and have three high material transportations: the one, lime-ash silt (slurry) and moisture content height, also have that the adhesiveness material adheres on the belt ectonexine, driving and driven cylinder surface, carrying roller surface up and down, operating mode is worsened; The 2nd, during the rotary screen screening, silt lime-ash, combustiblerefuse are all following to the screenings belt feeder, and be seriously polluted mutually; The 3rd, the house refuse complexity, density is little, and volume is big, and dust and sand is many, easily scatters ground everywhere from the belt feeder both sides; The 4th, house refuse has rancid material, and machine components are had corrosiveness and lost efficacy.

Summary of the invention

The objective of the invention is to overcome above-mentioned defective, a kind of nixing sieve separating method and polygonal drum broken bag screening machine that makes house refuse become combustion energy is provided, house refuse is sieved sorting, flammable rubbish and garbage are come by screening sorting difference; The garbage of high moisture content and lime-ash, silt rubbish and the difference of low moisture content combustible garbage of high moisture content are come; Living beings saprophytic property rubbish and non-decayable rubbish are come by screening sorting difference; With metal with nonmetally carry out sorting difference and come; Make rubbish reach standard coal 50-80% low heat valve, become the energy of burning electricity generation, need not add any auxiliary fuel, do not discharge dioxin.

Technical scheme of the present invention is: a kind of nixing sieve separating method that makes house refuse become combustion energy is characterized in that: the polygonal drum broken bag screening machine of Jiang Duotai is in turn connected into nixing sieve by the belt unit and divides streamline, and sieves according to the following steps:

1, the first order screening of packed composting: selecting the screening aperture is 120-150/50-70mm, with 90% above kitchen organic matter (moisture content), 〉=about 95% lime-ash silt (slurry) and 30-35% combustible separate through the first order and become screenings, through the screenings belt feeder, send into the transfer belt feeder, to the material loading belt feeder;

2, second level screening: the selection aperture is 50-70/15-30mm, sieve through the second level, oversize is 15-25%, lime-ash silt (slurry) 3-5% and＜15% combustible of kitchen organic matter (moisture content), through the oversize belt feeder, to the material loading belt feeder, through the trajectory sorting, remove masonry in the lime-ash silt (slurry), pottery, material that the glass isodensity is big, send into selection by winnowing, separate, kitchen organic matter and PVC are by artificial separation, and via hole diameter is a 15-25/5-10mm oversize belt feeder, to dump truck, deliver to the fertilizer workshop, the combustible use that acts as a fuel; Screenings is to isolate the kitchen organic matter (moisture content) of 70-80% and about 90% lime-ash silt (slurry), about 10% combustible, through the screenings belt feeder, with metal materials such as iron through magnetic separation, separated going out, send between recovery vehicle, the residue screenings is sent into third level screening to transfer belt feeder, charging belt machine;

3, third level screening: the selection aperture is 15-25/5-10mm, sieve through the third level, to separate screenings be＞85% lime-ash silt (moisture content), contain organic matter about 8% and about 2% combustible, through the screenings belt feeder, be sent to a heap stacking and turning through 1 month, after the fermentation and sterilization degraded, do non-burning brick use; Organic 65-75% in kitchen and about 8% inflammable substance, about 10% lime-ash silt (slurry) are arranged in the oversize that third level screening separates, through the oversize belt feeder, to dump truck, be sent to the fermentation of high-temperature aerobic fermentation pond, compost is after the 15-25d fermentation, enter rotary screen screening, general≤Ф 6 particles remove to do compost, and about 8% the combustible recovery of 〉=Ф 6 removes to do fuel;

4, fourth stage screening: the selection aperture is 200-270/130-150mm, in the oversize that first order screening separates, 65-80% be combustible ,≤5% kitchen bulk organic matter and＜3% lime-ash silt, through the oversize belt feeder,, sieve through fourth stage large aperture to the material loading belt feeder, the 30-45% combustible by oversize through the oversize belt feeder, to dump truck, separate, do fuel through fragmentation, most moisture content sieves substantially and separates, and does not comprise that bafta and paper products absorb moisture content; In the screenings of fourth stage screening based on the 30-45% combustible, also have noncombustibleses such as masonry in organic and about 2% the lime-ash silt (slurry) in about 3% kitchen, pottery, glass, through the screenings belt feeder, to the transfer belt feeder, through the charging belt machine, be sent to the trajectory sorting, remove the big material of density of masonry, pottery, glass, the air-supply choosing separates the kitchen organic matter with combustible; Kitchen organic matter and PVC are by artificial separation, and via hole diameter is a 15-25/5-10mm oversize belt feeder, to dump truck, delivers to the fertilizer workshop; Combustible is made fuel.

The rotating speed of said polygonal rotary screen is 20-30 rev/min, turns over and throws number of times 20-30 time/minute.

Said polygonal rotary screen needs the screenings belt feeder to carry screenings with the speed of 2.4m/s-1.6m/s when second, the time sieved with revolution 2-3.

A kind of polygonal drum broken bag screening machine, it comprises running part, support, screen drum body and sieve belt feeder down, running part is made of motor, reductor, power transmission shaft, rubber drive roll, the rubber drive roll is connected with motor and speed reducer by power transmission shaft, the front end of screen drum body and tail end are separately installed with polygonal ribbon cloth mouth and discharging opening, and the sieve end of belt feeder down is equipped with strainer; Said support has 0.5 °-4 ° inclination angle, belt feeder is installed in the below of screen drum body portion under the said sieve, be used for collection screen cylindrical shell screenings, the sieve frame and the support of belt feeder is down fixed, conveyer belt both sides under the sieve on the upper supporting roller of belt feeder install backplate additional, and this backplate is fixed on the frame, connects with rubber slab between backplate and the upper supporting roller, one end of rubber slab is connected with backplate, and the other end is taken the both sides of the conveyer belt that is contained in upper supporting roller top; Said screen drum body is a polygonal, its face is made up of the sieve plate that is fixed on screen drum body skeleton, the sieve aperture of sieve plate is oval slotted hole or conical slotted hole, and with the counter-clockwise direction of motion of the sieve plate layout that is arranged in parallel, there are broken bag cutter and/or baffle plate to be fixed on the sieve plate in the screen drum body, are fixed with on the sieve plate of the outer surface of screen drum body and can rotate the ball hammer of doing upper and lower 180 ° of motions with the screen drum body.

Described sieve plate is selected 16Mn steel plate or rubber-steel composite material or polyurethane-steel composite material or polyurethane material or nylon material or elastomeric material for use.

On the roll surface of described rubber drive roll, offer 2-4 bar groove, make whole rubber rollers resolve into three to four rubber rings, separate by groove between circle and the circle, and the 5-15mm slit is arranged by a whole rubber ring along axis.

Described broken bag cutter sieve plate upper edge helix install the 2-8 circle or along parallel junction between sieve plate and the sieve plate fixedly 2-8 enclose.

Described broken bag cutter is that the top is spring steel wire or the triangular taper or the blade row of taper.

Described broken bag cutter is arranged counter clockwise to the screen drum body, is arranged in proper order by cutter one short sword in the rimmer knife one.

Described upper supporting roller or snub pulley adopt the bidirectional screw formula of rubber or plastics.

The bearing of described strainer is the roller bearing units of usheing to seat, and this bearing adopts plastics and steel plate double-layer seal from the inside to the outside; Bearing block is the cast iron seat; Tensioning screw is a stainless steel material.

The present invention has the following advantages:

One, use said method,

1, combustible garbage is put together; the PVC sorting is gone out; make its caloric value improve 1-3 doubly; make house refuse become a kind of " energy "; incinerator is run well not adding any auxiliary fuel, reduce the operating cost energy savings, can also improve generated energy; do not discharge bioxin, the protection environment.

2, biomass garbage is put together, turn waste into wealth,, guarantee Environmental security so that produce organic fertilizer.

3, lime-ash, silt, pottery, the glass of high moisture content are separated, put together and produce non-burning brickly, glass is put together, recycle or other purposes.

4, metal is put together obtain regeneration.

House refuse is divided into five kinds of different-grain diameters, and make the flow proportional distribution of five kinds of logistics comparatively reasonable, it is a kind of suitable house refuse complicated shape variable grain size, different densities, the mixing screening sequential process that adapts to the rubbish characteristic, it has avoided the shortcoming of " from coarse to fine " or " from fine to coarse " single technology, and both advantages are got up, and becomes the new technology of mixing the screening order.

Two, use above-mentioned mixing screening plant,

1, screening efficiency improves:＞90%;

2,0.5 ° of-4 ° of small inclination, high and low baffle plate, prolonging material time of staying in the screen drum body is 1-5 minute;

3,20-30 rev/min of high rotating speed makes material turn over throwing often in the screen drum body: minimum 20-30 time/minute, the highest 5 minutes 100-150 time, average 3 minutes is 60-90 time;

4, economical screen drum body length, economical with materials;

5, impact ball hammer cylinder vibratory sieve, solve desliming (water) and easily stop up a difficult problem;

6, conical or oval long sieve aperture is parallel to the direction of motion of sieve plate, prevents to stop up, and improves screening efficiency, the expansion range of application.

7, the special material sieve plate becomes the effective measures of " wet screening ", improves screening percentage.

Description of drawings

Fig. 1 is a flow chart of the present invention; Fig. 2 is that nixing sieve of the present invention divides layout drawing;

Fig. 3 is nixing sieve separation structure figure of the present invention; Fig. 4 is the polygonal drum broken bag screening machine of a present invention structure chart;

Fig. 5 is the side view of Fig. 3; Fig. 6 is baffle arrangement figure; Figure 76 is baffle arrangement figure;

Fig. 8 is a sieve plate ball hammer structure chart; Fig. 9 is a ball hammer side view;

Figure 10 is sieve aperture structure chart and sieve aperture partial enlarged drawing; Figure 11 is a sieve aperture arranged schematic diagram;

Figure 12 is carrying roller, guard board structure schematic diagram.Figure 13 is the tension structure schematic diagram;

Figure 14 is broken bag cutter mounting structure figure and deployed configuration schematic diagram; Figure 15 is a broken bag knife structure schematic diagram;

Figure 16 is a rubber drive roll structural representation.

The specific embodiment

Embodiment: shown in Fig. 2,3, select octagonal screen drum body for use, six anistree drum broken bag screening machines are in turn connected into nixing sieve by the belt unit that sieves belt feeder 4 under belt feeder 26, the sieve, charging belt machine 25, transfer belt feeder 24 compositions and divide streamline; As shown in Figure 4, said anistree drum broken bag screening machine, it comprises running part 1, support 2, screen drum body 3 and sieve belt feeder 4 down, running part 1 is made of motor, reductor, power transmission shaft, rubber drive roll 5; As shown in figure 16, rubber drive roll 5 is four friction pulleys that adopt special thick natural rubber to make, on its roll surface, offer 2-4 bar groove 6 along axis, make whole rubber rollers resolve into three to four rubber rings by a whole rubber ring, separated by groove between circle and the circle, and the 5-15mm slit is arranged, rubber drive roll 5 is connected with motor and speed reducer by power transmission shaft; As shown in Figure 4, the front end of screen drum body and tail end are separately installed with polygonal ribbon cloth mouth 7 and discharging opening 8; Shown in Fig. 3,4,13, the sieve end of belt feeder 4 down is equipped with strainer 9, the bearing 10 of strainer 9 is 11 roller bearing units of usheing to seat, plastics and steel plate double-layer seal that this bearing 10 adopts from the inside to the outside, has anticorrosion, waterproof and dustproof, prevent house refuse three height, i.e. lime-ash silt height, garbage corrosivity height and the high harm of moisture; Bearing block 11 is the cast iron seat, has function anticorrosion, waterproof; Tensioning screw 12 is a stainless steel, uses non-corrosive for a long time in domestic rubbish disposal, does not corrode; As shown in Figure 4, said support 2 has 0.5 °-4 ° inclination angle, make rubbish in tube, sieve time of staying prolongation, as shown in Figure 3, belt feeder 4 is installed in the below of screen drum body 3 under the described sieve, be used to collect screenings, the frame 13 that belt feeder 4 under the sieve is installed is fixed on the inboard of support 2, as shown in figure 12, little for preventing house refuse density, volume is big, lime-ash silt is many, the moisture content height, at belt feeder 4,24,25,26 carry the shortcoming that easily scatters ground in the transport process, belt feeder 4,24,25,26 parallel upper supporting roller 14 or the conveyer belt both sides on the flute profile upper supporting roller 14 install backplate 15 additional, this backplate 15 is fixed on the frame 13 of tower structure, connect with rubber slab 16 between backplate 15 and parallel upper supporting roller 14 or the flute profile upper supporting roller 14, one end of rubber slab 16 is connected with backplate 15 usefulness bolts, detachably, the 50mm of the other end takes the both sides of the conveyer belt that is contained in parallel upper supporting roller 14 or flute profile upper supporting roller 14 tops, prevent that effectively material from scattering on ground, rubber slab 16 is thick 4-8mm, the band cord laminated rubber plate of wide 100-150mm; Shown in Figure 12 a, in domestic rubbish disposal, sieve is belt feeder 4 down, charging belt machine 25, transfer belt feeder 24 and sieve are gone up the bidirectional screw formula flute profile upper supporting roller that belt feeder 26 adopts rubber or plastic material, the flat shape snub pulley of bidirectional screw formula, effect because of spiral power, roll banding not when conveyer belt is carried in the rubbish lime-ash silt and caking property material, each carrying roller makes adhesive tape keep that tape surface is had the function of a sweeper, and keep carrying roller from cleaning function, the rubber layer on carrying roller surface and adhesive tape coefficient of friction are little, reduce the adhesive tape wearing and tearing and improve the life-span, there is the 20mm thickening bondline on the carrying roller surface, to masonry, pottery, concrete block, the bump of iron and steel plays cushioning effect, improve adhesive tape service life, rubber or plastic conveyer roller use " ABS " plastic bearing and sealing, raising is to the house refuse waterproof, antisepsis and antistatic property, above-mentioned belt feeder also can adopt bidirectional screw formula V-arrangement upper supporting roller peace shape snub pulley, as Figure 12 b, or bidirectional screw formula arc upper supporting roller peace shape snub pulley, as Figure 12 c, or be on the flat shape of bidirectional screw formula, the snub pulley structure is as Figure 12 d; As shown in Figure 5, the tube face of octagonal screen drum body is made up of the sieve plate 17 that is fixed on screen drum body skeleton, and sieve plate 17 is selected 16Mn steel plate or rubber one steel composite material or polyurethane one steel composite material or polyurethane material or nylon material or elastomeric material for use; As Figure 10, shown in 11, the sieve aperture 18 of sieve plate 17 is oval slotted hole or conical slotted hole, with the counter-clockwise direction of motion of sieve plate 17 layout that is arranged in parallel, as Figure 14, shown in 15, in the sieve screen drum body 3 of first order screening, fixing broken bag cutter 21 on the sieve plate 17 of its front end, broken bag cutter 21 is installed the 2-8 circle at sieve plate 17 upper edge helixes, or along the fixing 2-8 circle of parallel junction between sieve plate 17 and the sieve plate 17, broken bag cutter 21 is that the top is spring steel wire or the triangular taper or the blade row of taper, 21 pairs of screen drum bodies 3 of broken bag cutter are arranged counter clockwise, arrange in proper order by cutter one short sword in the rimmer knife one, be positioned on the sieve plate 17 of broken bag cutter rear end fixed interval in the screen drum body 3 and arrange height more, low baffle plate 19,20, second to fourth stage screen drum body 3, fixed interval is arranged height more on the sieve plate 17, low baffle plate 19,20, as Fig. 8,9, be fixed with on the sieve plate 17 of the outer surface of screen drum body 3 to rotate and do with the screen drum body, the ball hammer 22 that the 10-25kg of following 180 ° of motions is heavy; Shown in Fig. 8,9, rolling ring 23 is fixed on the two ends of screen drum body 3, is placed on the rubber drive roll 5 of running part, and whole screening machine is by the computer control frequency control, and the operative orientation of control rubber drive roll is counterclockwise;

As shown in Figure 1, 2, house refuse is carried out the level Four screening according to the following steps,

1, the first order of packed composting screening: combustiblerefuse and kitchen organic matter (moisture content) and lime-ash silt (slurry) are separated; Through the measuring and calculating of house refuse difformity and tens thousand of tons of sieving garbage examinations are sieved, the characteristic of garbage is that particle diameter is distributed in≤the accounting for more than 90% of 120-150/50-70mm in the house refuse, garbage needs three grades of screenings of " from coarse to fine ", and needs special-purpose polygonal drum broken bag screening machine to finish; The combustiblerefuse distribution of particles is at the 65-80% that accounts for of 〉=120-150/50-70, also need the two-stage screening of " from fine to coarse ", and combustiblerefuse put together, be distributed with certain proportion in the small particles, account for 20-35%, need three grades of screenings in " from coarse to fine ", combustiblerefuse is put together, therefore the first order of packed composting screening, selecting the screening aperture is 120-150/50-70mm, with 90% above kitchen organic matter (moisture content), 〉=95% lime-ash silt (slurry) and 30-35% combustible are separated through the first order becomes screenings, through the screenings belt feeder, send into the transfer belt feeder to the material loading belt feeder, enter second level screening;

2, second level screening: through the 50-70/15-30mm rotary screen screening of screening aperture, the second level, the 15-25% of kitchen organic matter (moisture content), lime-ash silt (slurry) 3%-5% and about 15% combustible are from oversize, through the oversize belt feeder, to the material loading belt feeder, through the trajectory sorting, remove masonry in the lime-ash silt (slurry), pottery, material that the glass isodensity is big, send into selection by winnowing, separate, kitchen organic matter and PVC are by artificial separation, and via hole diameter is a 15-25/5-10mm oversize belt feeder, to dump truck, deliver to the fertilizer workshop; Combustible is made fuel and is used; Isolate the kitchen organic matter (moisture content) of 70-80% and about 90% lime-ash silt (slurry), about 10% combustible in the screenings, through the screenings belt feeder, with the metal materials such as iron in the lime-ash silt (slurry) through magnetic separation, separated going out, send between recovery vehicle, the residue screenings is sent into third level screening to transfer belt feeder, charging belt machine;

3, third level screening: sieve through third level rotary screen particle diameter 15-25/5-10mm, to separate screenings be＞85% lime-ash silt (moisture content), contain≤8% kitchen organic matter and＜2% combustible, through the screenings belt feeder, be sent to and heap a stacking and a turning, through 1 month, after the fermentation and sterilization degraded, do non-burning brick use; Organic 65-75% in kitchen and about 8% combustible, about 10% lime-ash silt (slurry) are arranged in the oversize that third level screening separates, through the oversize belt feeder, to dump truck, be sent to the fermentation of high-temperature aerobic fermentation pond, compost is after the 15-25d fermentation, carry out rotary screen screening, general≤Ф 6 particles remove to do compost, and fuel is made in about 8% the combustible recovery of 〉=Ф 6;

4, fourth stage screening: in the oversize that first order screening separates, 65-80% be combustible ,≤5% kitchen bulk organic matter and＜3% lime-ash silt, through the oversize belt feeder, to the material loading belt feeder, through the screening of fourth stage large aperture 200-270/130-150mm, the 30-45% combustible by oversize through the oversize belt feeder, to dump truck, separate, do fuel through fragmentation, most moisture content sieves substantially and separates, and does not comprise that bafta and paper products absorb moisture content; In the screenings of fourth stage screening, based on the 30-45% combustible, also have noncombustibleses such as masonry in organic and about 2% the lime-ash silt (slurry) in about 3% kitchen, pottery, glass, through the screenings belt feeder, to the transfer belt feeder, through the charging belt machine, be sent to the trajectory sorting, remove the big material of density of masonry in the lime-ash silt (slurry), pottery, glass, the air-supply choosing separates kitchen organic matter (moisture content) with combustible; Organic matter and PVC are by artificial separation, and via hole diameter 15-20/5-10mm oversize belt feeder to dump truck, is delivered to the fertilizer workshop; Combustible is made fuel.

Above-mentioned mixing screening process, anistree rotary screen rotating speed is 20-30 rev/min, turns over and throws number of times 20-30 time/minute.

Above-mentioned mixing screening process, the first order screening preferred 150/60mm in aperture, the second level screening preferred 70/15mm in aperture, the third level screening preferred 20/5mm in aperture, the fourth stage screening preferred 270/130mm in aperture.

Long 4.61m is an example with Ф 1.5m rotary screen cylindrical shell, and when revolution needed 2S, the screenings belt feeder needed linear velocity to reach 2.45m/s, and the screening material new pollution can not take place.

When revolution needed 3S, it was 1.536m/s that the screenings belt feeder needs speed, can not pollute between the screening material.

When rotary screen when second, the time sieved with revolution 2-3, when needing the screenings belt feeder to carry screenings, could mate and do not produce secondary pollution with the speed of 2.4m/s-1.6m/s.

Operation principle: because China's house refuse extensively adopts bag (plastics) dressization, sack varies, and also has especially big sack, sack has and long weak point is arranged, and having widely has narrowly, and bag material is based on plastic sheeting, also be doped with paper bag, cloth bag, textile bag, even gunnysack or the like.

After packed house refuse enters polygonal drum broken bag screening machine, the volume of all sacks is all greater than the hole diameter of sieve (perforated) plate, some bag contacts with the broken bag cutter in the bagged garbage, most bagged garbage, form the rambling bed of material, in order to implement broken bag, the one, bagged garbage has the 1-5 minute sufficiently long time of staying in rotary screen, carry out broken bag, guarantee packed rate; The 2nd, have the broken bag cutter, guarantee big-and-middle pouch, even the broken bag of Jumbo Bag; The 3rd, keep 20-30 rev/min of higher rotation speed, make bagged garbage keep parabolic path and the powerful state that rolls, be convenient to broken bag, keep maximum to turn over the throwing distance, making sieve plate have concentrated being applied on the broken bag cutter with maximum pressure to bagged garbage and implement broken bag, must be polygonal sieve, can not be drum sieve, guarantee house refuse broken bag rate reach 〉=98%, finish simultaneously house refuse broken bag and large aperture the screening.

House refuse after the broken bag is because composition is extremely complicated, different, thickness length mixes, granular size difference is very big, moisture content is very big with seasonal variations, combustiblerefuse and kitchen organic matter (moisture content), lime-ash silt (slurry), the masonry pottery, the mutual blending of glass is assorted together, become the bed of material of piles and piles of hodgepodge, only some particle contacts with the compass screen surface hole in the house refuse bed of material, be not to be granule entirely, most kitchen organic matter (moisture content), lime-ash silt (slurry), masonry, pottery, glass disperses to be mixed among the combustiblerefuse bed of material, in order to implement combustiblerefuse and kitchen organic matter (moisture content), lime-ash silt (slurry) sieves separation, house refuse must have 20-30 rev/min of higher rotation speed, powerful leave tumbling motion and maximum is turned over the throwing distance, make the house refuse bed of material loose, have " activity ", the caked rubbish of diplomatic corps scatters, make combustiblerefuse and kitchen organic matter (moisture content), on sieve plate, constantly leave to roll between the lime-ash silt (slurry) and scatter, the 2nd, house refuse has 1-5 minute sufficiently long screening time in rotary screen, the logistics long-time continuous that forms when the house refuse bed of material keeps turning over throwing 20-150 time, powerful leaves, when tumbling motion is thrown distance state with maximum turning over, kitchen organic matter (moisture content), lime-ash silt (slurry) constantly gets rid of to take off from the combustiblerefuse preferably and separates.

Kitchen organic matter (moisture content), lime-ash silt (slurry) is seized the opportunity the gap of passing between the oarse-grained combustiblerefuse and is transferred to lower floor, make rambling house refuse carry out " layering ", kitchen organic matter (moisture content), lime-ash silt (slurry) is in lower floor, and than their big combustiblerefuse particles on the upper strata, be formed with regularly arranged, house refuse constantly left under the state of rolling for a long time through 1-5 minute in rotary screen and sieves 20-150 time, kitchen organic matter (moisture content), lime-ash silt (slurry) is because its coefficient of friction is big, the particle footpath is less than the large aperture sieve aperture, from sieve plate, separate, finish combustiblerefuse and kitchen organic matter (moisture content), lime-ash silt (slurry) is separated from first order screening, make screen rate bring up to＞90%.

China's house refuse has three height, garbage (moisture content) ratio height accounts for the house refuse gross mass up to 42.7-51.27%, be up to 66.8%, lime-ash silt (slurry) ratio height wherein, it accounts for the 50-60% of garbage gross mass, the moisture content height, water content is 45-60% in the house refuse, be up to 83.3%, in " wet screening ", desliming (water) screening, what face is＜0.5mm, 40 purpose lime-ash silts, and the moisture content of lime-ash adsorption of sediment 5-60%, its moisture content of can reuniting forms agglomerate, can also absorb a large amount of moisture content and form mud, because when moisture content is 5-8% in a part of material, wedge shape moisture content will appear, wedge shape moisture content makes between the house refuse cohesive force particle and between particle and the sieve plate and produces internal stress, cohesive force cause between the household garbage particles and particle and sieve plate hole between produce to reunite caking, stop up the sieve plate eyelet, screening efficiency is declined to a great extent.

When house refuse moisture content is 45-60%, and distributed pole is inhomogeneous, existing wedge shape moisture content between particle, space moisture content is arranged again, also has surperficial moisture content, house refuse had both formed reunion, the lime-ash of caking, silt, the stifled sieve plate eyelet of plug, also have surface water gap moisture content to soak into the sieve plate surface, with lime-ash, adsorption of sediment after a few hours screening, is formed thick dirt on the sieve plate or on the sieve plate eyelet around sieve plate or eyelet, run into fiberous material or easily stop up material, eyelet tightly can be stopped up, and fiber is with easily the obstruction material is more in the rubbish, the material that the easiest generation is stopped up in house refuse has:

1: the material that grain density is little: wollen fabrics fiber, foamed plastics, plastic sheeting, lime-ash silt etc.;

2: hygroscopic material: cotton, wollen fabrics, paper, cardboard, lime-ash, silt, garbage or the like;

3: the material that filling is good: cotton, textile, foamed plastics, lime-ash, silt, plastic sheeting etc.;

4: produce the static material: plastics, staple fibre or the like.

One is that easily to stop up material wide in variety in the house refuse, ratio is big, the 2nd, the moisture content height, skewness, wedge shape moisture content is arranged, also has surface water, gap moisture content, the 3rd, granularity is thinner≤0.5mm, 40 order lime-ash silts (slurry) and garbage account for the house refuse quality about half, be fixed with the heavy bead hammer of 10-25kg on the rotary screen, do by gravity, following 180 ° gyration, the bead hammer rotates with cylinder, cylinder turns around for every time, bead hammer hammering sieve plate once, sieve plate (screen cloth) then produces vibration, particularly use the extraordinary sieve plate of polyurethane or nylon, the hammering of bead hammer, make polyurethane or nylon sieve plate become the sieve plate or the vibration sieve of vibratory sieve, on rotary screen, adorn several ball hammers, rotary screen returns and turns around, be subjected to hammering several times, sieve plate (screen cloth) produces vibration several times, how many ball hammers that how much determines according to percentage of plugged hole is provided with, under the hammering of ball hammer, special sieve plate polyurethane or nylon sieve plate (screen cloth) produce the secondary vibration ripple, and under the continuous hammering of bead hammer, rubber-like grating (screen cloth) produces secondary, three times and n hypoelasticity vibration wave, making four classes that easily stick on grating (screen cloth) eyelet easily stop up material is difficult to stop up sieve aperture or block sieve aperture, special process was turned over throwing in long-time 1-5 minute and 20-150 time, anistree sieve is the repeatedly elastic vibration ripple of 160 times-1200 times vibrations, makes lime-ash silt (water) be difficult to reunite, and separates the saturating sieve of realization rapidly from compass screen surface, make the moisture content that retains on the sieve plate can't adsorb the silt of viscosity and fouling, having solved domestic and international rotary screen can't desliming (water) and susceptible to plugging technical barrier.

The bead hammer adopts four friction pulleys of special thick natural rubber owing to the rubber drive roll to the vibration of cylinder sieve plate, and the function that absorbs vibration wave is arranged, therefore sieve plate (screen cloth) is produced the vibration wave because of the bead hammer except that the screen drum body, transmission system and frame are not subjected to vibration effect.

The orientation of ellipse garden shape slotted hole sieve plate must be to arrange and arrange in the sieve plate upper edge inhour direction of motion along material (house refuse), be that oval slotted hole direction is parallel to the direction of motion of material on sieve plate, favourable moisture content (gap water or surface water) down trickles and discharges, help the mud that forms by the particulate silt gap water that wedge shape water body combinate form becomes, from oval slotted hole, sieve away or discharge, effectively improve the screen rate of desliming (water), and improved screening efficiency greatly.

After the oval slotted hole of desliming (water), the pass in sieve plate hole also can be conical slotted hole, up-small and down-big, arrange and arrange by up-small and down-big in the sieve plate upper edge inhour direction of motion along the material house refuse, be that conical slotted hole direction is up-small and down-big, be parallel to the direction of motion of material on sieve plate, conical slotted hole helps surperficial moisture content in the house refuse, gap moisture content is trickling from top to bottom on sieve plate, with under high rotating speed centrifugal action, from conical slotted hole, separate, the favourable wedge shape water body of circular port sieve plate gathers producing the agglomerate that uniform internal stress forms between the particle and between particle and the sieve plate eyelet and stops up sieve aperture, and the internal stress of the up-small and down-big agglomerate of hole shape of conical slotted hole is to go up greatly, and plaquette hole internal stress is extremely inhomogeneous down, because the agglomerate internal stress of stopping up in the conical slotted hole, has extremely uneven characteristic, long-time 1-5 minute and very easily screening under higher rotation speed 20-30 rev/min centrifugal action, discharge sieve aperture, desliming (water) sieve plate is selected conical slotted hole.

Adopt the special material sieve plate, 16Mn steel plate, rubber sieve plate, polyurethane sieve plate, nylon sieve plate, screen cloth etc. are difficult for stopping up eyelet, wearability is good, reduces noise.

Polyurethane or nylon sieve plate (screen cloth), it has elasticity, in screening process, makes sieve plate (screen cloth) produce secondary or vibration wave repeatedly, makes the four above-mentioned classes that easily stick on the sieve plate (screen cloth) easily stop up material, is difficult to block sieve aperture or blocks sieve aperture.

After house refuse enters charging aperture by polygonal drum broken bag screening machine, carry out first procedure--broken bag, screening machine is with 20-30 rev/min of high rotational speed, bagged garbage and rubbish at random are thrown so that parabolical is high, fall on the broken bag cutter of distance farthest and carry out the broken bag operation, house refuse is advanced to the discharging opening direction with zigzag shape, 2-8 circle broken bag cutter is housed in the polygonal drum broken bag screening machine, broken bag-screening process is the comprehensive process process of broken bag limit, limit screening, bagged garbage broken bag rate 〉=98%, house refuse is divided into two after the screening of large aperture, house refuse is divided into oversize and screenings two-way, with kitchen organic matter (moisture content)＞90%, lime-ash silt 〉=95%, from combustiblerefuse, separate, and with especially big, greatly, in, short grained combustiblerefuse separates and puts together, and makes contained kitchen organic matter (moisture content)≤5% in the combustiblerefuse, is lower than the 6-26% of the U.S., lime-ash silt (slurry)≤5% makes the combustiblerefuse low heat valve improve 1-2 doubly.Reach the low heat valve of developed country's house refuse fully; reach the 50-80% of China's standard bituminous coal low heat valve; consumer waste incineration per ton does not add any auxiliary fuel; can save fuel oil 30-67 liter; existing good economic benefit; enlarge 1 times of domestic rubbish disposal amount; isolate PVC (polyvinyl chloride) and HCL through selection by winnowing and picking; effectively stop the source of refuse incineration from generating dioxins and HCL; guarantee that waste incineration is neither to airborne release dioxin and HCL; protecting does not have bioxin and HCL yet in the lime-ash, have good benefits in environment, makes China's house refuse be converted into a kind of " energy " truly.

Claims (10)

1, a kind of nixing sieve separating method that makes house refuse become combustion energy is characterized in that: the polygonal drum broken bag screening machine of Jiang Duotai is in turn connected into nixing sieve by the belt unit and divides streamline, and sieves according to the following steps:

(1) first order of packed composting screening: selecting the screening aperture is 120-150/50-70mm, with 90% above kitchen organic matter (moisture content), 〉=95% lime-ash silt (slurry) and 20-35% combustible be through first order screening, separating becomes screenings, through the screenings belt feeder, send into the transfer belt feeder, to the material loading belt feeder, enter second level screening;

(2) second level screening: the selection aperture is 50-70/15-30mm, sieve through the second level, separating oversize is the 15-25% of kitchen organic matter (moisture content), lime-ash silt (slurry) 3-5% and＜15% combustible, through the oversize belt feeder, to the material loading belt feeder, through the trajectory sorting, remove the masonry in the lime-ash silt (slurry), pottery, the material that the glass isodensity is big, send into selection by winnowing, the kitchen organic matter is separated with combustible, kitchen organic matter and PVC are by artificial separation, through third level screening oversize belt feeder, to dump truck, deliver to the fertilizer workshop, the combustible use that acts as a fuel; Isolated screenings is the kitchen organic matter (moisture content) of 70-80% and about 90% lime-ash silt (slurry), about 10% combustible, through the screenings belt feeder, with the metal materials such as iron in the lime-ash silt (slurry) through magnetic separation, separated going out, send between recovery vehicle, the residue screenings is sent into third level screening to transfer belt feeder, charging belt machine;

(3) third level screening: the selection aperture is 15-25/5-10mm, sieve through the third level, to separate screenings be＞85% lime-ash silt (slurry), contain kitchen organic matter (moisture content) about 8% and about 2% combustible, through the screenings belt feeder, be sent to and heap a stacking and a turning, through 1 month, after the fermentation and sterilization degraded, do non-burning brick use; In the oversize that third level screening separates, the inflammable substance of kitchen organic matter (moisture content) 65-75% and about 8%, about 10% lime-ash silt (slurry) are arranged, through the oversize belt feeder, to dump truck, be sent to the fermentation of high-temperature aerobic fermentation pond, compost is after fermentation in 15-25 days, carry out rotary screen screening, general≤Φ 6 particles remove to do compost, and about 8% the combustible recovery of 〉=Φ 6 removes to do fuel;

(4) fourth stage screening: the selection aperture is 200-270/130-150mm, in the oversize that first order screening separates, 65-80% is combustible and≤5% kitchen bulk organic matter and＜3% lime-ash silt, through the oversize belt feeder, to the material loading belt feeder, sieve to fourth stage large aperture, the 30-45% combustible is an oversize, through the oversize belt feeder, to dump truck, separate, after fragmentation, do fuel, most moisture content sieves substantially and separates, and does not comprise that bafta and paper products absorb moisture content; In the screenings of fourth stage screening based on the 30-45% combustible, also have noncombustibleses such as masonry in the lime-ash silt (slurry) of about 3% kitchen organic matter and about 2%, pottery, glass, through the screenings belt feeder, to the transfer belt feeder, through the charging belt machine, be sent to the trajectory sorting after, remove the big material of density of masonry in the lime-ash silt (slurry), pottery, glass, the air-supply choosing separates the kitchen organic matter with combustible; Kitchen organic matter and PVC are by artificial separation, and via hole diameter is a 15-25/5-10mm oversize belt feeder, to dump truck, deliver to the fertilizer workshop; Combustible is made fuel.

2, a kind of nixing sieve separating method that makes house refuse become combustion energy according to claim 1, it is characterized in that: the rotating speed of said polygonal rotary screen is 20-30 rev/min, turns over and throws number of times 20-30 time/minute.

3, a kind of polygonal drum broken bag screening machine, it comprises running part, support, screen drum body and sieve belt feeder down, running part is made of motor, reductor, power transmission shaft, rubber drive roll, the rubber drive roll is connected with motor and speed reducer by power transmission shaft, the front end of screen drum body and tail end are separately installed with polygonal ribbon cloth mouth and discharging opening, and the sieve end of belt feeder down is equipped with strainer; It is characterized in that: said support has 0.5 °-4 ° inclination angle, belt feeder is installed in the below of screen drum body portion under the said sieve, be used for collection screen cylindrical shell screenings, the sieve frame and the support of belt feeder is down fixed, conveyer belt both sides under the sieve on the upper supporting roller of belt feeder install backplate additional, and this backplate is fixed on the frame, connects with rubber slab between backplate and the upper supporting roller, one end of rubber slab is connected with backplate, and the other end is taken the both sides of the conveyer belt that is contained in upper supporting roller top; Said screen drum body is a polygonal, its face is made up of the sieve plate that is fixed on screen drum body skeleton, the sieve aperture of sieve plate is oval slotted hole or conical slotted hole, and with the counter-clockwise direction of motion of the sieve plate layout that is arranged in parallel, there are broken bag cutter and/or baffle plate to be fixed on the sieve plate in the screen drum body, are fixed with on the sieve plate of the outer surface of screen drum body and can rotate the ball hammer of doing upper and lower 180 ° of motions with the screen drum body.

4, a kind of polygonal drum broken bag screening machine according to claim 3 is characterized in that: described sieve plate is selected 16Mn steel plate or rubber-steel composite material or polyurethane-steel composite material or polyurethane material or nylon material or elastomeric material for use.

5, a kind of polygonal drum broken bag screening machine according to claim 3, it is characterized in that: on the roll surface of described rubber drive roll, offer 2-4 bar groove along axis, make whole rubber rollers resolve into three to four rubber rings by a whole rubber ring, separate by groove between circle and the circle, and the 5-15mm slit is arranged.

6, a kind of polygonal drum broken bag screening machine according to claim 3 is characterized in that: described broken bag cutter sieve plate upper edge helix install the 2-8 circle or along parallel junction between sieve plate and the sieve plate fixedly 2-8 enclose.

7, a kind of polygonal drum broken bag screening machine according to claim 3 is characterized in that: described broken bag cutter is that the top is spring steel wire or the triangular taper or the blade row of taper.

8, a kind of polygonal drum broken bag screening machine according to claim 3, it is characterized in that: described broken bag cutter is arranged counter clockwise to the screen drum body, is arranged in proper order by rimmer knife-middle cutter-short sword.

9, a kind of polygonal drum broken bag screening machine according to claim 3 is characterized in that: described upper supporting roller or snub pulley adopt the bidirectional screw formula of rubber or plastics.

10, a kind of polygonal drum broken bag screening machine according to claim 3, it is characterized in that: the bearing of described strainer is the roller bearing units of usheing to seat, this bearing adopts plastics and steel plate double-layer seal from the inside to the outside; Bearing block is the cast iron seat; Tensioning screw is a stainless steel material.

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