CN108424181B

CN108424181B - Garbage dewatering device

Info

Publication number: CN108424181B
Application number: CN201810332015.6A
Authority: CN
Inventors: 孙友权
Original assignee: Ningbo Qingzhi Environmental Protection Technology Co ltd
Current assignee: Ningbo Qingzhi Environmental Protection Technology Co ltd
Priority date: 2018-04-13
Filing date: 2018-04-13
Publication date: 2021-02-26
Anticipated expiration: 2038-04-13
Also published as: CN108424181A

Abstract

The invention relates to the technical field of garbage treatment devices, and particularly discloses a garbage dewatering device which comprises a rack, a dewatering mechanism, a sorting mechanism and a detection mechanism, wherein the sorting mechanism, the dewatering mechanism and the detection mechanism are sequentially arranged from left to right. The sorting mechanism comprises a sorting plate provided with a rectangular hole, a tension sensor, a first controller and a first air cylinder detection mechanism, and the sorting plate, the tension sensor, the first controller and the first air cylinder detection mechanism comprise a detection box, and an object bearing plate and a second air cylinder are arranged in the detection box. The invention aims to achieve the purpose of separating articles such as plastic bags, paper bags and the like in the kitchen waste and then sufficiently dewatering the kitchen waste.

Description

Garbage dewatering device

Technical Field

The invention relates to the technical field of garbage disposal devices, and particularly discloses a garbage dewatering device.

Background

Along with the improvement of living standard and the increasing of population, the discharge amount of municipal solid waste, especially the discharge amount of kitchen waste, is increasing continuously. The collection of kitchen waste for treatment and resource utilization also become a new application direction at present.

The kitchen waste contains more leftovers, vegetable leaves and the like, is very suitable for composting, but the kitchen waste also contains certain waste which is difficult to degrade, such as plastic bags, paper bags and the like, and needs to be separated and then dewatered; in addition, in the composting process of the kitchen waste, the water content of the kitchen waste is required to be lower, and the control of the water content of the kitchen waste is a key problem.

Disclosure of Invention

The invention provides a garbage dewatering device, which aims to achieve the purpose of fully dewatering kitchen garbage after separating objects such as plastic bags, paper bags and the like in the kitchen garbage.

The basic scheme of the invention is as follows: garbage water trap, including frame and dewatering mechanism, sorting mechanism and detection mechanism, sorting mechanism is including the sorting board of seting up the rectangular hole, force sensor, first controller and first cylinder, sorting board passes through extension spring pull rod and frame fixed connection, sorting board left end upwarps the right-hand member and pushes down the slope setting, force sensor sets up on the extension spring pull rod, first controller and force sensor circuit connection, sliding connection has first piston in the first cylinder, be connected with first extension spring between the downside of first piston and the end lateral wall of first cylinder, the first push rod of side fixedly connected with on the first piston, the free end of first push rod is provided with the screening plate, the side surface of going up of screening plate is provided with the sieve needle selection that a plurality of plastic bags were used for separating in the rubbish from kitchen select the needle.

The dewatering mechanism includes that the left end upwarps the filter that the right-hand member pushed down the slope and set up, and the below of filter is provided with the waste water collection case that is arranged in collecting the rubbish from cooking waste water, and the intercommunication of waste water collection case has the bleeder valve, and the side of filter is equipped with the dewatering roller, and the dewatering roller contacts with the filter, and the dewatering roller rotates with the frame to be connected.

The detection mechanism comprises a detection box and a timing controller with a timing function, and an object bearing plate is arranged in the detection box. The left of holding the thing board is provided with the second cylinder that is used for promoting rubbish after detecting, is equipped with air inlet and gas outlet on the second cylinder, is provided with the solenoid valve between air inlet and the gas outlet, and the solenoid valve is connected with the controller. The bottom surface of the object bearing plate and the inner bottom wall of the detection box are connected with a second tension spring, a second piston is connected in a second cylinder in a sliding mode, the right end of the second piston is connected with a second push rod, a fourth tension spring is sleeved on the second push rod, a second one-way air inlet and a second one-way air outlet are formed in the second cylinder, the timing controller is used for controlling air inlet of the second one-way air inlet at first preset time, and air outlet of the second one-way air outlet is controlled at second preset time.

The left side tank wall of the detection box is provided with a first discharge port, the right side tank wall starts to be provided with a second discharge port, the first discharge port is higher than the second discharge port, a first collecting barrel is arranged at the left of the first discharge port, and a second collecting barrel is arranged at the right of the second discharge port.

The technical principle of the invention is as follows: when rubbish from cooking is on the sorting board, because the weight of sorting board increases, the extension spring pull rod can be the pulling force downwards, force sensor will experience the pulling force, then force sensor transmission an electric signal gives first controller, first controller controls first solenoid valve earlier after accepting the signal and opens, close the second solenoid valve, make first one-way air inlet department ventilate, let in the air in the messenger first cylinder, make first push rod shift up fast, the sieve needle selection on the screening board that sets up on the first push rod can insert to the rectangular opening, make the rectangular opening filled up by the sieve needle. If the kitchen garbage contains plastic bags, paper bags and other articles, the plastic bags can be punctured by the screening needles to be retained on the screening needles, and the diameter of the cross section of each screening needle is larger than that of rice grains, so that the rice grains and vegetable leaves in the kitchen garbage cannot be punctured and fall onto the filter plate under the influence of gravity.

After the surplus rubbish in kitchen after the separation sent into the filter, the filter slope sets up so rice grain vegetable leaf can roll down under the influence of self gravity, when the surplus rubbish in kitchen rolls to dewatering roller department, can produce contact looks mutual friction between the two in addition dewatering roller clockwise rotation this moment can extrude the surplus rubbish in kitchen through here, makes the moisture discharge of the surplus rubbish in kitchen. The discharged wastewater drops into the wastewater collection box through the filter plate. If the kitchen garbage after being dewatered is equal to or less than the weight value, the volume of the dewatered garbage is basically the same within a certain time because the preset time is equal, at the moment, the object bearing plate still feels slight pressure and presses downwards, the timing controller still receives an electric signal to control the second push rod to move leftwards, at the moment, the second push rod pushes the lower end of the object bearing plate or pushes the second tension spring to bend the second tension spring rightwards. Thereby when timing controller controls the one-way gas outlet of second after the time of settlement and gives vent to anger and make the second push rod reset under the effect of fourth extension spring, second extension spring self also can reset, thereby produces elasticity left and makes kitchen garbage pop out from first discharge gate department and fall into first collecting box, and kitchen garbage side at this moment has accomplished the dewatering, can accomplish processing such as subsequent compost.

The kitchen waste can fall into the object bearing plate in the detection box after being drained, when the weight of the kitchen waste is greater than 1000 units, the object bearing plate can be automatically pressed to the bottom due to gravity, the object bearing plate can transmit an electric signal to the timing controller after sensing pressure, the second one-way air inlet is opened to enable air to be introduced into the second air cylinder, and the air pushes the second piston to continuously move rightwards at the moment, so that the kitchen waste is pushed to fall into the second collection box from the second discharge hole. The timing controller controls the second one-way air outlet to exhaust air after the set time, so that the second push rod is reset under the action of the fourth tension spring; the object bearing plate is then lifted up under the action of the second tension spring after being subjected to no pressure. And carrying out secondary dewatering after collection until the kitchen waste is ejected from the first discharge hole.

The invention has the beneficial effects that: 1. the tension sensor and the first controller which are arranged through the sorting mechanism automatically complete separation of difficult-to-degrade garbage such as plastic bags in the kitchen garbage through the gravity of the kitchen garbage, and the kitchen garbage after separation is dewatered independently.

2. The arrangement of the water filtering plate and the waste water collecting box can collect waste water after water removal for centralized recovery treatment.

3. The obliquely arranged water filtering plate and the sorting plate can enable kitchen garbage to roll by gravity without the aid of external power.

4. Compared with the prior art, the kitchen waste water treatment device has the advantages that the second spring is arranged, the water content of the treated kitchen waste is represented according to the pressure applied to the second spring, so that the kitchen waste can be discharged from different discharge ports, the kitchen waste which is not completely dewatered for the first time can be sufficiently dewatered, and the kitchen waste which is thoroughly dewatered can not be treated any more.

Further, be provided with reinforced mechanism between sorting mechanism and the dewatering mechanism, reinforced mechanism is including the conveyer belt that is used for conveying the kitchen garbage after sorting, fixedly connected with head rod in the frame of conveyer belt top, and the right flank of head rod middle part department is provided with the electro-magnet through the bracing piece, and the free end of head rod is provided with the response piece, is provided with the power supply line in the response piece, passes through coil connection between response piece and the electro-magnet. Be provided with the charging box in the frame of head rod right side, the charging box includes the case body and the bottom of the iron case, fixed connection between the upper end of case body and the frame, lower extreme and the bottom of the iron case sliding connection, the electro-magnet is relative with the left end of the bottom of the iron case, the inside third extension spring that is connected with the case body inner wall of the right-hand member of the bottom of the iron case, the bottom clearance contact of conveyer belt right direction of transfer has the filter, the charging box is filled with microelement.

The separated kitchen waste contains more rice grains and vegetable pieces, if the content of the rice grains in the treated kitchen waste is more, the rice grains can slightly vibrate in the conveying process of the conveying belt, when the rice grains move to the induction sheet, the induction sheet vibrates to drive the coil to vibrate, the coil generates electricity, and the coil supplies power to the electromagnet; the electro-magnet can adsorb the iron bottom of the case and remove left after the circular telegram to make the charging box opened, the trace drops to the conveyer belt on, can add the element to kitchen garbage, makes kitchen garbage and microelement can mix completely in the follow-up extrusion dewatering, makes behind the kitchen garbage compost nutrient substance abundanter, more is favorable to follow-up utilization.

Further, the first preset time of the timing controller is 10 s-20 s, and the second preset time is 10 s-20 s.

The first preset time is 10 s-20 s, so that the air inlet time can be effectively controlled, the pushing is more facilitated, and the second preset time is different from the first preset time, so that the back-and-forth movement of the second push rod can be completely controlled, and the material pushing effect is better.

Further, the surface of the dewatering roller is a stainless steel anticorrosive coating.

The kitchen garbage can not be corroded by acidic sewage in the process of removing water from the kitchen garbage, so that the service life of the whole equipment is shortened, and the kitchen garbage can not be effectively removed with water.

Further, the trace element is a potash fertilizer.

Because the potassium content of the vegetable leaves in the plants is higher, the potassium content of the rice grains is lower, in order to ensure the composting effect of the dewatered kitchen garbage, enough potassium fertilizer can be ensured when more rice grains are contained in the screened kitchen garbage, and the composting effect is not influenced.

Drawings

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

FIG. 2 is a schematic view of the construction of the sorting plate according to the invention;

FIG. 3 is a schematic view of the internal structure of the detection box of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the device comprises a rack 1, a tension spring pull rod 2, a tension sensor 3, a first controller 4, a sorting plate 5, a first connecting rod 6, a supporting rod 7, an electromagnet 8, a box body 9, a first air cylinder 10, a first piston 11, a first tension spring 12, a first push rod 13, a screening plate 14, a screening needle 15, an induction sheet 16, a coil 17, a conveyor belt 18, a dewatering roller 19, a wastewater concentration box 20, a filtering plate 21, a first collecting barrel 22, a second collecting barrel 23, a detection box 24, a first discharge hole 25, a second discharge hole 26, a second air cylinder 27, a second piston 28, a material bearing plate 29, a second tension spring 30, a second push rod 31, a rectangular hole 32 and an iron box bottom 33.

The embodiment is basically as shown in the attached figure 1: the garbage dewatering device comprises a rack 1, wherein two elastic tension spring pull rods 2 are movably connected at the left end of the rack 1 through a pin shaft, a tension sensor 3 is arranged on the left side surface of the upper end of the tension spring pull rod 2 at the left side, a first controller 4 is arranged on the rack 1 at the right side of the tension spring pull rod 2, and the first controller 4 is electrically connected with the tension sensor 3; the lower extreme welding of two extension spring pull rods 2 has same piece to select separately board 5, selects separately 5 slope settings of board. In this embodiment, the tension sensor 3 may be an HX711 module of TELESKY, and the first controller 4 may be an AT89C51 series single chip microcomputer.

As shown in fig. 2, a rectangular hole 32 is formed in the middle of the sorting plate 5; referring to the attached drawing 1, the lower rectangular hole 32 of the sorting plate 5 is provided with a first cylinder 10 in a right-facing manner, the first cylinder 10 is connected with a first piston 11 in a sliding manner, a first tension spring 12 is connected between the lower side surface of the first piston 11 and the bottom side wall of the first cylinder 10, a first push rod 13 is welded on the upper side surface of the first piston 11, a screening plate 14 is arranged at the upper end of the first push rod 13, a plurality of screen selection needles 15 are arranged on the upper side surface of the screening plate 14, and the diameter of the cross section of each screening needle 15 is larger than that of the cross section of rice grains. The first cylinder 10 is provided with a first one-way air inlet and a first one-way air outlet, the first one-way air inlet is provided with a first electromagnetic valve, the first one-way air outlet is provided with a second electromagnetic valve, and the first controller 4 is used for controlling the opening and closing of the first electromagnetic valve and the second electromagnetic valve.

A conveyor belt 18 for conveying sorted kitchen waste is arranged at the right side of the lower end of the sorting plate 5, a first connecting rod 6 is welded on the rack 1 above the conveyor belt 18, an electromagnet 8 is arranged on the right side surface of the middle part of the first connecting rod 6 through a support rod 7, an induction sheet 16 is arranged at the lower end of the first connecting rod 6, a power supply circuit is arranged in the induction sheet 16, and the induction sheet 16 is connected with the electromagnet 8 through a coil 17; the feeding box is arranged on the frame 1 on the right side of the first connecting rod 6 and comprises a box body 9 and an iron box bottom 33, the upper end of the box body 9 is fixedly connected with the frame 1, the lower end of the box body is connected with the iron box bottom 33 in a sliding mode through a sliding groove, the electromagnet 8 is opposite to the left end of the iron box bottom 33, and a third tension spring is connected with the inner wall of the box body 9 inside the right end of the iron box bottom 33. The feeding box is filled with potassium fertilizer.

Conveyer belt 18 has the filter 21 that the slope set up is pushed down to the right side direction of transfer's of warping on the left end bottom clearance contact, the below of filter 21 is provided with the waste water centralized box 20 that is arranged in collecting the rubbish from cooking waste water, the left side intercommunication of waste water centralized box 20 has the discharge valve, can carry out the discharge concentrated to the waste water in the waste water centralized box 20, the filter 21 is close to the one end contact of upwarping and has dewatering roller 19, dewatering roller 19 surface is the stainless steel anticorrosive coating, can handle the great raw materials of acidity in the rubbish from cooking. The dewatering roll 19 is rotatably connected with the frame 1.

A detection box 24 is arranged at the lower right end of the filter plate 21, as shown in fig. 3, an object bearing plate 29 is arranged in the detection box 24, the weight unit of the object bearing plate 29 is twenty kilograms, a second air cylinder 27 is arranged at the left of the object bearing plate 29, the object bearing plate 29 is electrically connected with a timing controller, and a second tension spring 30 is connected between the lower side surface of the object bearing plate 29 and the inner bottom wall of the detection box 24; second piston 28 sliding connection has in the second cylinder 27, the right-hand member of second piston 28 is connected with second push rod 31, the cover is equipped with the fourth extension spring on the second push rod 31, second one-way air inlet and the one-way gas outlet of second have been seted up to second cylinder 27, in this embodiment, timing controller can adopt PCC timing controller, timing controller is used for controlling the one-way air inlet of second and admitting air for twenty seconds at first preset time, control the one-way gas outlet of second and give vent to anger for twenty seconds at second preset time.

A first discharge port 25 is formed in the left box wall of the detection box 24, a second discharge port 26 is formed in the right box wall, and the first discharge port 25 is higher than the second discharge port 26. The first collecting barrel 22 is provided at the left of the first discharging hole 25, and the second collecting barrel 23 is provided at the right of the second discharging hole 26.

The specific implementation process is as follows: starting a working switch of the dewatering roller 19, wherein the dewatering roller 19 rotates clockwise at the moment; artificially dumping a certain amount of kitchen waste to the left side of the sorting plate 5, at this time, due to the increase of the weight of the sorting plate 5, the tension spring and tension rod 2 is pulled downwards, the tension sensor 3 senses the tension, then the tension sensor 3 transmits an electric signal to the first controller 4, after receiving the signal, the first controller 4 controls the first electromagnetic valve to be opened, closes the second electromagnetic valve, allows the first one-way air inlet to be ventilated, allows air to be introduced into the first air cylinder 10, allows the first push rod 13 to move upwards quickly, allows the screening needle 15 on the screening plate 14 arranged on the first push rod 13 to be inserted into the rectangular hole 32, and allows the rectangular hole 32 to be filled with the screening needle 15.

If there are plastic bags, paper bags and other articles in the kitchen waste, the plastic bags are pierced by the screening needles 15 and retained on the screening needles 15, and the diameter of the cross section of the screening needles 15 is larger than that of the cross section of rice grains, so that the rice grains and leaves in the kitchen waste are not pierced but fall onto the conveyor belt 18 under the influence of gravity. After the kitchen garbage after sorting falls, the tension spring pull rod 2 does not receive downward tension, the tension sensor 3 does not transmit an electric signal to the first controller 4, the first controller 4 closes the first electromagnetic valve, and the second electromagnetic valve is opened to enable the first one-way air outlet pipe to vent air, so that the first piston 11 resets under the first tension spring 12.

The separated kitchen waste contains more rice grains and vegetable pieces, if the content of the rice grains in the processed kitchen waste is more, the rice grains can slightly vibrate in the transportation process of the conveyor belt 18, when the rice grains move to the induction sheet 16, the rice grains can vibrate up and down, so that the induction sheet 16 vibrates up and down, and the coil 17 is cut to electrify the electromagnet 8 in the up-and-down vibration process of the induction sheet 16; the electromagnet 8 can adsorb the iron box bottom 33 to move leftwards after being electrified, so that the charging box is opened, potassium fertilizer drops to the conveyor belt 18, and due to the fact that the potassium content of vegetable leaves in plants is high, the potassium content in rice grains is low, in order to guarantee the composting effect of the dewatered kitchen garbage, enough potassium fertilizer can be guaranteed when the rice grains in the screened kitchen garbage are large, and the composting effect is not influenced. After the kitchen waste passes through the conveyor belt 18, the electromagnet 8 is not electrified, and the iron plate is reset under the action of the third tension spring, so that the box body returns to the closed state again.

The rice and vegetable leaves after feeding are sent to the filter plate 21 through the conveyor belt 18, the filter plate 21 is obliquely arranged, so the rice and vegetable leaves can roll down under the influence of self gravity, when kitchen garbage rolls to the dewatering roller 19, contact mutual friction can be generated between the rice and vegetable leaves, and the kitchen garbage passing through the kitchen garbage can be extruded when the dewatering roller 19 rotates clockwise, so that the water of the kitchen garbage is discharged. The discharged wastewater drops through the filter sheet 21 into the wastewater collection tank 20.

If the amount of kitchen waste is twenty kilograms or less than twenty kilograms after dewatering, the object bearing plate 29 still feels pressure and slightly presses down at the moment, the timing controller still receives an electric signal to control the second push rod 31 to move leftwards, and at the moment, the second push rod 31 pushes the lower end of the object bearing plate 29 or pushes the second tension spring 30, so that the second tension spring 30 bends rightwards. When the timing controller controls the second one-way air outlet to discharge air after the set time, so that the second push rod 31 is reset under the action of the fourth tension spring, the second tension spring 30 resets, elasticity is generated leftwards, and kitchen waste is ejected from the first discharge hole 25 and falls into the first collection box, the kitchen waste side at the moment is dewatered, and subsequent compost treatment and the like can be completed.

The kitchen waste will fall into the object bearing plate 29 in the detection box 24 after being drained, when the weight of the kitchen waste is twenty kilograms, such as thirty kilograms, at this time, the object bearing plate 29 will be automatically pressed to the bottom due to gravity, the object bearing plate 29 will transmit an electric signal to the timing controller after sensing pressure, so that the second one-way air inlet is opened to let air in the second cylinder 27, and at this time, the air pushes the second piston 28 to continuously move rightwards, thereby pushing the kitchen waste to fall into the second collection box from the second discharge hole 26. The timing controller controls the second one-way air outlet to discharge air after the set time, so that the second push rod 31 is reset under the action of the fourth tension spring; the carrier plate 29 is then raised under the action of the second tension spring 30 after it has not been subjected to pressure. The second dewatering after collection is carried out until the kitchen waste is ejected from the first outlet 25.

Then pouring the same amount of kitchen garbage and repeating the above process to complete the next work.

The above description is only an example of the present invention and common general knowledge in the art is not described here too much. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. The garbage dewatering device comprises a rack, a dewatering mechanism, a sorting mechanism and a detection mechanism, wherein the sorting mechanism comprises a sorting plate provided with a rectangular hole, a tension sensor, a first controller and a first air cylinder, the sorting plate is fixedly connected with the rack through a tension spring pull rod, the left end of the sorting plate is upwarped and the right end of the sorting plate is arranged in a downward pressing and inclining manner, the tension sensor is arranged on the tension spring pull rod, the first controller is connected with a tension sensor circuit, a first piston is connected in the first air cylinder in a sliding manner, a first tension spring is connected between the lower side surface of the first piston and the bottom side wall of the first air cylinder, a first push rod is fixedly connected with the upper side surface of the first piston, a screening plate is arranged at the free end of the first push rod, and a plurality of screening needles used for separating plastic bags in kitchen garbage are arranged on the upper side surface of the,

the dewatering mechanism comprises a filter plate with the left end tilted upwards and the right end pressed downwards, a waste water collecting box used for collecting waste water in kitchen waste is arranged below the filter plate, the waste water collecting box is communicated with a discharge valve, a dewatering roller is arranged on the side surface of the filter plate, the dewatering roller is contacted with the filter plate and is rotationally connected with the frame,

the detection mechanism comprises a detection box, an object bearing plate is arranged in the detection box, a second cylinder for pushing detected garbage is arranged at the left of the object bearing plate, an air inlet and an air outlet are formed in the second cylinder, an electromagnetic valve is arranged between the air inlet and the air outlet and connected with a controller, a second tension spring is connected between the bottom surface of the object bearing plate and the inner bottom wall of the detection box, a second piston is connected in the second cylinder in a sliding manner, a second push rod is connected to the right end of the second piston, a fourth tension spring is sleeved on the second push rod, a second one-way air inlet and a second one-way air outlet are formed in the second cylinder, the controller is used for controlling the second one-way air inlet to be filled at a first preset time and controlling the second one-way air outlet to be filled at a second preset time,

the detection box comprises a detection box body, and is characterized in that a first discharge port is formed in the left box wall of the detection box body, a second discharge port begins to be formed in the right box wall of the detection box body, the first discharge port is higher than the second discharge port, a first collecting barrel is arranged at the left of the first discharge port, a second collecting barrel is arranged at the right of the second discharge port, and the sorting mechanism, the water removal mechanism and the detection mechanism are sequentially arranged from left to right.

2. The trash dewatering device of claim 1, further comprising: a feeding mechanism is arranged between the sorting mechanism and the dewatering mechanism, the feeding mechanism comprises a conveyor belt for conveying sorted kitchen waste, a first connecting rod is fixedly connected to the rack above the conveyor belt, an electromagnet is arranged on the right side face of the middle part of the first connecting rod through a supporting rod, a sensing piece is arranged at the free end of the first connecting rod, a power supply line is arranged in the sensing piece, the sensing piece is connected with the electromagnet through a coil, the sensing piece is connected with the electromagnet through the power supply line, a feeding box is arranged on the rack on the right side of the first connecting rod, the feeding box comprises a box body and an iron box bottom, the upper end of the box body is fixedly connected with the rack, the lower end of the box body is slidably connected with the iron box bottom, the electromagnet is opposite to the left end of the iron box bottom, and a third tension spring is connected with the inner wall of the box body inside the right end of the, the bottom end of the conveyor belt towards the right conveying direction is in clearance contact with a filter plate, and the feeding box is filled with trace elements.

3. The trash dewatering device of claim 2, further comprising: the first preset time of the timing controller is 10 s-20 s, and the second preset time is 10 s-20 s.

4. The trash dewatering device of claim 3, further comprising: the surface of the dewatering roller is a stainless steel anticorrosive coating.