CN219117315U

CN219117315U - Sludge treatment system

Info

Publication number: CN219117315U
Application number: CN202320211427.0U
Authority: CN
Inventors: 曹伟贤
Original assignee: Guangzhou Chuangyi Renewable Resources Co ltd
Current assignee: Guangzhou Chuangyi Renewable Resources Co ltd
Priority date: 2023-02-14
Filing date: 2023-02-14
Publication date: 2023-06-02
Anticipated expiration: 2033-02-14

Abstract

A sludge treatment system, a wet sludge treatment device, a dry sludge treatment device, a sludge dewatering treatment device and a mixing extrusion device; utilize wet mud processing apparatus to separate mud, sand, stone to with the mud sanitization on stone surface, utilize dry mud processing apparatus to separate dry mud and stone, utilize mud dewatering processing apparatus to filter-press mud into mud cake, utilize compounding extrusion device to extrude wet mud respectively with dry mud and drier mixture, solve the problem of mud recycling.

Description

Sludge treatment system

Technical Field

The utility model relates to sludge treatment equipment, in particular to a sludge treatment system.

Background

Sludge is sediment formed by material migration, transformation and precipitation in water or sediment formed by suspended matter deposition in water body in the process of purifying domestic sewage and industrial wastewater. Sludge is a solid waste, or precisely a semi-solid waste, formed with the purification of various types of water. The sludge has the characteristics of high water content (about 80 percent of water content), large volume, high organic matter content, fine particles, poor air permeability and a large amount of active microorganisms, and contains various metal elements. Because the amount of sludge is large and contains high concentration of pollutants, serious secondary pollution is caused to the environment if the sludge cannot be properly treated.

The mud cake has fluid property due to higher water content, so that the subsequent disposal difficulty and cost are higher. At present, direct landfill is mostly adopted, because the sludge is too loose, the compaction, the covering and other works cannot be carried out on the surface of the sludge, and the sludge flows into a collecting system along with percolate, so that the percolate collecting system is blocked, the percolate of a landfill is in a disordered flowing state, and serious pollution and harm are caused to the surrounding environment.

Mud cakes with high water content are also unsuitable for direct incineration, and must be evaporated by natural air drying or input of an external heat source to reduce their water content. At present, the drying of sludge is generally divided into full drying (the solid content is more than 85%) and half drying (the solid content is about 55%), no matter which way is adopted, an external heat source is required to be input, so that the water in the sludge overcomes the bonding force between the water and colloid substances in the sludge and becomes free water, and then the water is evaporated and taken away along with flue gas when the temperature is increased and the evaporation point of the water is reached.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a sludge treatment system which can recycle sludge.

In order to solve the technical problems, the technical scheme of the utility model is as follows: a sludge treatment system, a wet sludge treatment device, a dry sludge treatment device, a sludge dewatering treatment device and a mixing extrusion device;

the wet mud treatment device comprises a vibrating screen, a double-spiral sand washer and a high-frequency vibrating dewatering screen; the vibrating screen is obliquely arranged and comprises a first layer of screen mesh for conveying stones and a second layer of screen mesh which is arranged below the first layer of screen mesh and is used for conveying sediment, a first high-pressure flushing head is arranged above the first layer of screen mesh, a first conveying belt is arranged at the output end of the first layer of screen mesh, and the first conveying belt is in butt joint with the crusher; the output end of the second layer of screen is in butt joint with the input end of the double-spiral sand washer, the output end of the double-spiral sand washer is in butt joint with the input end of the high-frequency vibration dewatering screen, the output end of the high-frequency vibration dewatering screen is provided with a second conveying belt, and the second conveying belt is in butt joint with a finished sand heap;

the sludge dewatering treatment device comprises a collecting tank, a clean water tank, a concentration tank, a dosing tank and filter pressing equipment; the collecting tank is connected with the top input port of the concentration tank through a first pipeline, the bottom output port of the concentration tank is connected with the input end of the filter pressing equipment through a second pipeline, the top overflow port of the concentration tank is connected with the clean water tank through a third pipeline, the dosing tank is connected with the top input port of the concentration tank through a fourth pipeline, the dosing tank is connected with the second pipeline through a fifth pipeline, the dosing tank is connected with the input end of the filter pressing equipment through a sixth pipeline, the clean water tank is connected with the dosing tank through a seventh pipeline, the clean water tank washes the filter pressing mesh belt of the filter pressing equipment through an eighth pipeline, and filtered water of the filter pressing equipment returns to the collecting tank through a channel;

the mixing extrusion device comprises a pug extruder, a mixer and a spiral feeder; a third conveyer belt is arranged between the output end of the filter pressing equipment and the input end of the mixer, a fourth conveyer belt is arranged between the output end of the spiral feeder and the input end of the mixer, and the output end of the mixer is in butt joint with the input end of the pug extruder;

the dry mud treatment device comprises a mud-stone separator and a roller screen, a fifth conveying belt is arranged between the stone output end of the mud-stone separator and the input end of the vibrating screen, a sixth conveying belt is arranged between the dry mud output end of the mud-stone separator and the input end of the roller screen, a seventh conveying belt is arranged between the stone output end of the roller screen and the fifth conveying belt, and an eighth conveying belt is arranged between the dry mud output end of the roller screen and the fourth conveying belt.

The principle of the utility model is as follows: wet mud treatment process: wet soil residues enter a vibrating screen, a first layer of screen mesh of the vibrating screen separates large stones, then the large stones after separation and flushing are washed by first high-pressure water, the large stones enter a first conveying belt from an output end, the first conveying belt conveys the large stones to a crusher for crushing, and the crushed stones return to the vibrating screen again; the sediment and small stones enter a second layer of screen, and then enter a double-spiral sand washer from the second layer of screen; the double-screw sand washer separates mud, sand and small stones, the mud is dissolved into water to form mud water, the mud water enters a collecting tank, the sand and the small stones are conveyed to a high-frequency vibration dewatering screen for dewatering, and the dewatered sand and the small stones are conveyed to a finished sand storage yard through a second conveying belt. The sludge dewatering treatment process comprises the following steps: the muddy water is stored and precipitated in the collecting tank to form slurry, and the slurry is pumped to the concentration tank through the first pipeline; the flocculating settling medicine in the medicine adding pond is pumped to a concentration tank through a fifth pipeline, and the slurry and the medicine are mixed in the concentration tank and settled; the clear water in the concentration tank overflows to a clear water tank through a third pipeline; the thick slurry at the bottom of the concentration tank automatically flows and is conveyed to filter pressing equipment through a second pipeline, and the conveying process is mixed with a fifth pipeline medicament to flocculate again into clusters, and is mixed with a sixth pipeline xanthate to adjust quality; the mud enters filter pressing equipment for mud-water separation, water obtained by filter pressing flows back to a collecting tank for drug effect recycling, and mud cakes output by filter pressing are discharged to a storage yard; the clean water in the clean water tank can be used for adding medicines through the first pipeline, and the filter-pressing mesh belt of the filter-pressing equipment can also be flushed through the eighth pipeline. And (3) pug extrusion process: the mud is subjected to filter pressing through filter pressing equipment to form mud cakes, and the mud cakes directly fall on a third conveying belt; the third conveyer belt conveys the mud cake to the mixer, and the dry materials such as sawdust are conveyed to the mixer through the spiral feeder and the fourth conveyer belt; stirring and mixing the mud cake and the dry materials in a mixer, and neutralizing the moisture in the mud cake to ensure that the mud cake is suitable for extrusion granulation; the mixed materials enter a pug extruder for extrusion molding, and the extruded pugs are convenient to store and can be used as fertilizer. The dry mud treatment process comprises the following steps: the dry soil slag enters a mud-stone separator, and the large stones are screened out and conveyed to a vibrating screen through a fifth conveying belt and then conveyed to a crusher through the vibrating screen; the dry mud is screened out by a mud-stone separator and is conveyed to a roller screen through a sixth conveying belt, the roller screen further sorts the dry mud and stones, the dry mud is mixed with wet mud cakes through an eighth conveying belt and enters a mud extruder for extrusion, and stones screened by the roller screen enter a vibrating screen through a seventh conveying belt.

As an improvement, the input end of the double-spiral sand washer is provided with a second high-pressure flushing head, and the first high-pressure flushing head and the second high-pressure flushing head are connected with a cleaning pump.

As an improvement, the input end of the vibrating screen is provided with a supporting frame, the supporting frame is provided with a digging machine, and the digging machine is arranged above the first layer of screen.

As an improvement, the top of the concentration tank is provided with a mixing runner, the mixing runner is obliquely arranged, the output end of the mixing runner is connected with the input port of the concentration tank, and the first pipeline and the fourth pipeline are in butt joint with the mixing runner.

As an improvement, the first pipeline is connected with the first water pump, the fourth pipeline is connected with the fourth water pump, the fifth pipeline is connected with the fifth water pump, the sixth pipeline is connected with the sixth water pump, the seventh pipeline is connected with the seventh water pump, and the eighth pipeline is connected with the eighth water pump.

As an improvement, a mixer is arranged on the second pipeline, a spiral sheet is arranged in the mixer, and the fifth pipeline is connected to the mixer.

As an improvement, the mud-rock separator comprises a plurality of parallel separating rollers and a driving structure for driving the separating rollers to rotate, wherein each separating roller comprises a roller body and a plurality of polygonal ring bodies arranged on the surface of the roller body, gaps are arranged between the roller bodies of adjacent separating rollers, and the polygonal ring bodies of the adjacent separating rollers are staggered with each other.

As an improvement, the sixth conveyor belt passes through a dry mud mixer.

As an improvement, the mixer comprises a mixing box and a stirrer arranged in the mixing box; the spiral feeding machine is arranged in the sawdust bin; the pug extruder comprises an extrusion cylinder and an extrusion head.

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

utilize wet mud processing apparatus to separate mud, sand, stone to with the mud sanitization on stone surface, utilize dry mud processing apparatus to separate dry mud and stone, utilize mud dewatering processing apparatus to filter-press mud into mud cake, utilize compounding extrusion device to extrude wet mud respectively with dry mud and drier mixture, solve the problem of mud recycling.

Drawings

FIG. 1 is a layout of the present utility model.

FIG. 2 is a schematic view of a wet sludge treatment apparatus.

FIG. 3 is a schematic view of a sludge dewatering treatment apparatus.

Fig. 4 is a top view of the thickening tank.

Fig. 5 is a schematic diagram of a compounding extrusion apparatus.

FIG. 6 is a schematic diagram of a dry sludge treatment apparatus.

Description of the embodiments

The utility model is further described below with reference to the drawings.

As shown in fig. 1, a sludge treatment system comprises a wet sludge treatment device 1, a dry sludge treatment device 4, a sludge dewatering treatment device 2 and a mixing extrusion device 3.

As shown in fig. 2, the wet sludge treatment apparatus 1 includes a vibrating screen 11, a double spiral sand washer 12, a high frequency vibration dewatering screen 13, and a cleaning apparatus. The vibrating screen 11 is obliquely arranged through a supporting column, the lower end is an output end, the higher end is an input end, wet soil residues enter the vibrating screen 11 from the input end, and the vibrating screen 11 performs vibrating conveying through vibration and self gravity of the soil residues; the vibrating screen 11 has two layers of screens, including a first layer of screens for screening and conveying stones and a second layer of screens which are arranged below the first layer of screens and are used for conveying sediment; the output end of the first layer of screen cloth is provided with a first conveying belt 14, the first conveying belt 14 is in butt joint with the crusher, the first layer of screen cloth is used for conveying the large stones to the crusher for crushing after screening, and the crusher returns to the vibrating screen 11 after crushing; the input end of the vibrating screen 11 is provided with a supporting frame, the supporting frame is provided with a digging machine, the digging machine is arranged above the first layer of screen, soil and slag are dumped into the input end of the vibrating screen 11, some soil and slag cannot directly enter the vibrating screen 11, and the digging machine is required to help to shift the soil and slag into the vibrating screen 11; the output end of the second layer of screen mesh is in butt joint with the input end of the double-spiral sand washer 12, and the second layer of screen mesh conveys sediment and small stones to the double-spiral sand washer 12. The double-screw sand washer 12 is arranged obliquely, the lower end is an input end, the higher end is an output end, and the double-screw sand washer 12 is provided with two screw rods for lifting sand and small stones. The output end of the double-spiral sand washer 12 is in butt joint with the input end of the high-frequency vibration dewatering screen 13, a second conveying belt 15 is arranged at the output end of the high-frequency vibration dewatering screen 13, and the second conveying belt 15 is in butt joint with a finished sand heap. The cleaning device comprises a clean water tank, a first high-pressure flushing head 16 arranged above the first layer of screen, a second high-pressure flushing head 17 arranged at the input end of the double-spiral sand washer 12 and a cleaning pump 18, wherein the input end of the cleaning pump 18 is connected with the clean water tank, the output end of the cleaning pump 18 is connected with the first high-pressure flushing head 16 and the second high-pressure flushing head 17 through water pipes, the first high-pressure flushing head 16 can clean sediment on the surface of a large stone block, and the second high-pressure flushing head 17 can accelerate separation of mud, sand and small stones. Wet mud treatment process: raw soil slag enters a vibrating screen 11, a first layer of screen mesh of the vibrating screen 11 separates large stones, then the large stones after separation and washing are washed by high-pressure water, the large stones enter a first conveying belt 14 from an output end, and the large stones are conveyed to a crusher by the first conveying belt 14 to be crushed; the sediment and small stones enter a second layer of screen mesh and then enter a double-spiral sand washer 12 from the second layer of screen mesh; the double-screw sand washer 12 separates mud, sand and small stones, the mud is dissolved into water to form mud water, the mud water is collected in a collecting tank and is waiting to enter a concentration tank, the sand and the small stones are conveyed to a high-frequency vibration dewatering screen 13 for dewatering, and the dewatered sand and the small stones are conveyed to a finished sand storage yard through a second conveying belt 15.

As shown in fig. 3, the sludge dewatering treatment apparatus 2 includes a collection tank 201, a clean water tank 202, a concentration tank 203, a dosing tank 204, and a filter press device 206. The collecting tank 201 is connected with the top input port of the concentrating tank 203 through a first pipeline 208, the first pipeline 208 is connected with a first water pump, and the first water pump is a submersible slurry pump, so that slurry in the collecting tank 201 can be pumped into the concentrating tank 203. The bottom output port of the concentration tank 203 is connected with the input end of the filter pressing equipment 206 through a second pipeline 209, and the thick slurry in the concentration tank 203 is settled and conveyed to the filter pressing equipment 206 in a self-flowing mode; the second pipeline 209 is provided with a mixer 205, and a spiral sheet is arranged in the mixer 205, and the mixer 205 is used for mixing mud and medicament, so as to further accelerate mud flocculation. The top of the concentration tank 3 is provided with an overflow port, the overflow port is connected with the clean water tank 202 through a third pipeline 210, the slurry of the concentration tank 203 is sunk, and clean water can automatically overflow to the clean water tank 202 through the overflow port for collection, so that the liquid level balance in the concentration tank 203 is ensured. The dosing tank 204 is connected with the top input port of the concentration tank 203 through a fourth pipeline 211, the fourth pipeline 211 is connected with a fourth water pump, and the fourth pipeline 211 is used for adding flocculating settling medicine of the dosing tank 24 into the concentration tank 23 to be mixed with slurry. As shown in fig. 4, a mixing flow channel 217 is provided at the top of the concentration tank 203, the mixing flow channel 217 is inclined, an output end of the mixing flow channel 217 is connected with an input port of the concentration tank 203, and the first pipeline 208 and the fourth pipeline 211 are abutted to the mixing flow channel 217; the mixing flow channel 217 is curved in an arc shape, so that the mixing flow channel 217 is prolonged, and the medicament and the slurry can be fully mixed. The dosing tank 204 is connected with the mixer 205 on the second pipeline 209 through a fifth pipeline 212, the fifth pipeline 212 is connected with a fifth water pump, and the concentrated slurry flows out of the concentration tank 203 and is flocculated again with the medicament through the mixer. The dosing tank 204 is connected with the input end of the filter pressing equipment 206 through a sixth pipeline 213, the sixth pipeline 213 is connected with a sixth water pump, and the sixth pipeline 213 is used for adding xanthate tempering. The clean water tank 202 is connected with the dosing tank 204 through a seventh pipeline 214, the seventh pipeline 214 is connected with a seventh water pump, and clean water in the clean water tank 202 can be used for dosing medicines. The clean water tank 202 washes the filter pressing mesh belt of the filter pressing device 206 through an eighth pipeline 215, the eighth pipeline 215 is connected with an eighth water pump, and clean water in the clean water tank 202 can be used for cleaning the filter pressing device 206. The bottom of the filter pressing device 206 is provided with a water filtering tank 207, the bottom of the water filtering tank 207 is conical, and the filtered water of the filter pressing device 206 and the muddy water of the flushing filter screen belt are returned to the collecting tank 201 through a channel 216. The sludge dewatering treatment process comprises the following steps: the muddy water is stored and precipitated in the collecting tank 201 to form slurry, and the slurry is pumped to the concentrating tank 203 through the first pipeline 208; the flocculating settling medicine in the medicine adding tank 204 is pumped to the concentration tank 203 through the fifth pipeline 212, and the slurry and the medicine are mixed in the concentration tank 203 and settled; the clean water in the concentration tank 203 overflows to the clean water tank 202 through the third pipeline 210; the thick slurry at the bottom of the concentration tank 203 automatically flows and is conveyed to the filter pressing equipment 206 through the second pipeline 209, and the conveying process is mixed with the medicament of the fifth pipeline 212 for flocculation again, and mixed with the xanthate of the sixth pipeline 213 for tempering; the mud enters filter pressing equipment 206 for mud-water separation, the water obtained by filter pressing flows back to a collecting tank 201 for drug effect recycling, and mud cakes output by filter pressing are discharged to a storage yard; the clean water in the clean water tank 202 can be used for adding medicines through the first pipeline 208, and can also be used for flushing the filter pressing mesh belt of the filter pressing device 206 through the eighth pipeline 215.

As shown in fig. 4, the mixing extrusion device 3 includes a pug extruder 34, a mixer 33, and a screw feeder 31. The filter pressing equipment 206 can filter-press and dehydrate the slurry to form a mud cake with lower water content, and different numbers of filter pressing equipment 206 can be arranged according to the needs, and the filter pressing equipment 206 are arranged side by side; the filter pressing equipment 206 comprises a filter pressing net belt, a driving mechanism for driving the filter pressing net belt and a mud scraping plate arranged at the output end; a third conveying belt 36 is arranged between the output end of the filter pressing device 206 and the input end of the mixer 33, and the mud cake is directly conveyed to the mixer 33 through the third conveying belt 36. The spiral feeder 31 is arranged in the sawdust bin 32, quantitative conveying of dry materials such as sawdust and the like can be achieved through the spiral feeder 31, a fourth conveying belt 35 is arranged between the output end of the spiral feeder 31 and the input end of the mixer 33, and the dry materials and wet mud cakes are matched and mixed to achieve the effect of adjusting the humidity of the mud cakes. The output end of the mixer 33 is in butt joint with the input end of a pug extruder 34, the pug extruder 34 comprises an extrusion cylinder and an extrusion head, and the pug extruder 34 is used for extruding the mixed materials into particles, so that the storage and the transportation are convenient; the pug extruder 34 of this embodiment is mounted on a support frame with a space below it for material collection. The mixer 33 includes a mixing tank and a stirrer provided in the mixing tank. And (3) mixing and extruding: the mud is subjected to filter pressing by filter pressing equipment 206 to form mud cakes, and the mud cakes directly fall on the third conveying belt 36; the third conveyer belt 36 conveys the mud cake to the mixer 33, and the dry materials such as sawdust and the like are conveyed to the mixer 33 through the spiral feeder 31 and the fourth conveyer belt 35; the mud cake and the dry material are stirred and mixed in a mixer 33, and the moisture in the mud cake is neutralized, so that the mud cake is suitable for extrusion granulation; the mixed materials enter a pug extruder 34 for extrusion molding, and the extruded pugs are convenient to store and can be used as fertilizer.

As shown in fig. 5, the dry sludge treatment apparatus 4 includes a mud-stone separator 41 and a drum screen 43. The mud-rock separator 41 is used for screening and separating dry soil and slag, a conical hopper is arranged at an upper input port of the mud-rock separator 41, the mud-rock separator 41 comprises a plurality of separation rollers which are arranged in parallel and a driving structure for driving the separation rollers to rotate, each separation roller comprises a roller body and a plurality of polygonal ring bodies which are arranged on the surface of the roller body, gaps are arranged between the roller bodies of adjacent separation rollers, and the polygonal ring bodies of the adjacent separation rollers are staggered with each other; a fifth conveying belt 44 is arranged between the stone output end of the mud-stone separator 41 and the input end of the vibrating screen 11, and a sixth conveying belt 45 is arranged between the dry mud output end of the mud-stone separator 41 and the input end of the roller screen 43; dry soil and slag enter the mud-stone separator 41 through the conical hopper, the soil and slag fall onto the separating rollers, dry mud falls onto the sixth conveying belt 45 below through gaps between the separating rollers, larger mud blocks can be crushed through polygonal rings on the surfaces of the separating rollers, and the crushed mud blocks can pass through the gaps; the large stones cannot stay on the surface of the separation roller through the gap, the separation roller rotates, and the large stones can be conveyed through the polygonal ring body on the surface of the separation roller, and the large stones fall onto the fifth conveyor belt 44 from one end. The sixth conveying belt 45 passes through the dry mud mixer 42, the dry mud mixer 42 is arranged at the input end or the output end of the sixth conveying belt 45, and the uncrushed mud blocks are crushed by the dry mud mixer, so that the screening or the mixing of the subsequent process is facilitated. A seventh conveyor belt 46 is arranged between the stone output end of the roller screen 43 and the fifth conveyor belt 44, and the stone screened and separated by the roller screen 43 is re-entered into the vibrating screen 11. An eighth conveyor belt 47 is arranged between the dry mud output end of the roller screen 43 and the third conveyor belt 36, and the mud cake and the dry mud are mixed and extruded into granules by a mud extruder 34. The dry mud treatment process comprises the following steps: the dry soil slag enters a mud stone separator 41, and the large stones are screened out and conveyed to a vibrating screen 11 through a fifth conveying belt 44 and then conveyed to a crusher through the vibrating screen 11; the dry mud is screened out by the mud-stone separator 41 and conveyed to the roller screen 43 through the sixth conveying belt 45, the roller screen 43 further sorts the dry mud and stones, the dry mud is mixed with wet mud cakes through the conveying belt and enters the mud extruder 34 for extrusion, and stones screened by the roller screen 43 enter the vibrating screen 11 through the sixth conveying belt 45. The dry mud and the wet mud are treated and mixed at the same time, so that the problem of recycling the sludge is solved.

Claims

1. A sludge treatment system, characterized in that: a wet sludge treatment device, a dry sludge treatment device, a sludge dewatering treatment device and a mixing extrusion device;

2. A sludge treatment system as claimed in claim 1 wherein: the input end of the double-spiral sand washer is provided with a second high-pressure flushing head, and the first high-pressure flushing head and the second high-pressure flushing head are connected with a cleaning pump.

3. A sludge treatment system as claimed in claim 1 wherein: the input of shale shaker is equipped with the support frame, be equipped with the excavator on the support frame, the excavator is established in the top of first layer screen cloth.

4. A sludge treatment system as claimed in claim 1 wherein: the top of the concentration tank is provided with a mixing runner, the mixing runner is obliquely arranged, the output end of the mixing runner is connected with the input port of the concentration tank, and the first pipeline and the fourth pipeline are in butt joint with the mixing runner.

5. A sludge treatment system as claimed in claim 1 wherein: the first pipeline is connected with the first water pump, the fourth pipeline is connected with the fourth water pump, the fifth pipeline is connected with the fifth water pump, the sixth pipeline is connected with the sixth water pump, the seventh pipeline is connected with the seventh water pump, and the eighth pipeline is connected with the eighth water pump.

6. A sludge treatment system as claimed in claim 1 wherein: the second pipeline is provided with a mixer, a spiral sheet is arranged in the mixer, and the fifth pipeline is connected to the mixer.

7. A sludge treatment system as claimed in claim 1 wherein: the mud-rock separator comprises a plurality of separating rollers which are arranged in parallel and a driving structure for driving the separating rollers to rotate, wherein each separating roller comprises a roller body and a plurality of polygon rings which are arranged on the surface of the roller body, gaps are arranged between the roller bodies of adjacent separating rollers, and the polygon rings of the adjacent separating rollers are staggered with each other.

8. A sludge treatment system as claimed in claim 1 wherein: the sixth conveyor belt passes through a dry mud mixer.

9. A sludge treatment system as claimed in claim 1 wherein: the mixer comprises a mixing box and a stirrer arranged in the mixing box; the spiral feeding machine is arranged in the sawdust bin; the pug extruder comprises an extrusion cylinder and an extrusion head.