JP3791705B2 - Rubber dewatering device and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rubber dewatering apparatus and method for removing water from crumbs obtained in the process of producing synthetic rubber.
[0002]
[Prior art]
Since the crumb obtained in the synthetic rubber manufacturing process contains about 30% of water, it is necessary to dehydrate it to about 10% and send it to the next step.
[0003]
A conventional rubber dewatering device for dewatering this crumb supplies the crumb from one end side of a cylindrical barrel having a drainage passage formed radially, and compresses the crumb by a screw shaft that rotates in the barrel, while other than the barrel. When sending from the end side to the next process, moisture in the crumb compressed in the barrel oozes out from the drain passage.
[0004]
In such a type of rubber dewatering device, a part of the crumb oozes out from the drain passage of the barrel together with the water. If the crumb that has oozed out of the barrel with water is left as it is, the viscosity increases as the temperature decreases, which adheres to and accumulates on the outer periphery of the barrel and lowers the dehydration function. There is a risk of causing a stoppage. For this reason, conventionally, every 15 minutes or 30 minutes, an operator scrapes off the crumbs adhering to the outer periphery of the barrel using a scraping jig, and recovers this to return to the previous step.
[0005]
[Problems to be solved by the invention]
In general, since the surroundings of the rubber dehydrator are in a hot and humid atmosphere, manually scraping the crumb that has exuded to the outer periphery of the barrel under such an environment requires considerable labor. This will force workers, which is not desirable from the viewpoint of improving the working environment.
[0006]
Also, when removing crumbs from the outer periphery of the barrel using a scraping jig, the crumbs adhere to and accumulate on the scraping jig due to the adhesion force of the crumb itself, so it is necessary to remove the crumbs from the scraping jig. The work efficiency was not so good.
[0007]
OBJECT OF THE INVENTION
An object of the present invention is to provide a rubber dewatering apparatus and a method thereof that can automatically and efficiently remove crumbs that bleed out from the outer periphery of the barrel together with water from the barrel.
[0008]
[Means for Solving the Problems]
A first aspect of the present invention is a hopper into which crumb containing water is introduced from a buffer tank , a cylindrical barrel having one end connected to the hopper and a plurality of drainage passages formed radially, A screw shaft that is housed in this barrel so as to be driven to rotate and that is fed into the other end of the barrel while compressing the crumb charged from the hopper, and is connected to the other end of the barrel and connected to the other end of the barrel. A face plate in which a discharge port for discharging the dewatered crumb that has been sent out is formed, and is arranged so as to face the outer peripheral surface of the barrel along the screw shaft, and is supplied with high-pressure hot water, respectively. a plurality of hot water injection nozzle for scraping off crumbs from the water drain passage of the barrel oozing with water from the outer peripheral surface of the barrel, the scraped crumb from the outer peripheral surface of the barrel before In rubber dewatering apparatus characterized in that comprising a recovery means for returning to the buffer tank.
[0009]
According to the present invention, the crumb containing water in the buffer tank is put into the barrel from the hopper , and these are pressure-fed from one end side of the barrel toward the other end side by a screw shaft that rotates. In this pumping process, the crumb is compressed, moisture is discharged from the drainage passage of the barrel, and a part of the crumb oozes out from the drainage passage. Moreover, the crumb which is sent to the other end side of the barrel and dehydrated is pushed out from the discharge port of the face plate and sent to the next process.
[0010]
On the other hand, high-pressure hot water supplied to a plurality of hot water injection nozzles is sprayed from the hot water injection nozzles toward the outer peripheral surface of the barrel, and the crumbs that have exuded from the drainage passage of the barrel are washed away from the outer peripheral surface of the barrel. Is returned to the buffer tank by the collecting means .
The rubber dewatering device according to the first aspect of the present invention can further include a shutter that is reciprocally attached in the radial direction of the face plate and can change the opening area of the discharge port.
Moreover, it can be further provided with a pair of nozzle brackets arranged on the side of the barrel so as to face each other across the barrel in parallel with the screw shaft and to which the hot water spray nozzles are respectively attached. In this case, it is possible to further include a motor that is connected to one end of a pair of nozzle brackets that are rotatably supported and swings the nozzle brackets.
According to a second aspect of the present invention, a step of introducing a crumb containing water into the barrel from one end side of a cylindrical barrel having a plurality of drainage passages formed radially, and an addition from one end side of the barrel The compressed crumb is compressed and sent to the other end of the barrel, and the dewatered crumb is discharged from the discharge port of the face plate connected to the other end of the barrel, and the crumb is compressed in the barrel. A step of scraping the crumb exuding together with water from the drainage passage of the barrel with high-pressure hot water from the outer peripheral surface of the barrel, a step of recovering the crumb scraped off from the outer peripheral surface of the barrel, and a recovered crumb again comprising a step of introducing from one end of the barrel, the step of scraping the crumb from the outer peripheral surface of the barrel, the crumb was dehydrated from the discharge port of said face plate In rubber dehydration process characterized in that it is carried out simultaneously with the step to out.
In the rubber dehydrating method according to the second aspect of the present invention, the hot water may be heated to 70 to 90 ° C.
[0011]
【Example】
An embodiment in which the rubber dehydrating apparatus and method according to the present invention are incorporated in a synthetic rubber manufacturing system will be described in detail with reference to FIGS.
[0012]
As shown in FIG. 3 representing the concept of the synthetic rubber production system in the present embodiment, the processing tank 11 provided with the motor-driven stirring blade 10 contains the rubber solution obtained in the previous step and high-temperature steam. And hot water from the hot water tank 12 is supplied, and a crumb slurry is formed here. In addition, for example, toluene or the like as a solvent for the rubber solution is recovered from the processing tank 11 and returned to the previous process side.
[0013]
The crumb slurry in the processing tank 11 is supplied to the buffer tank 14 side by a pump 13 together with hot water. The buffer tank 14 is provided with a stirring blade 16 that is rotated by a motor 15, and the crumb slurry and hot water are stirred in the buffer tank 14 by the driving rotation of the stirring blade 16. The crumb slurry in the buffer tank 14 is sequentially supplied onto the drainage conveyor 18 by the pump 17, and becomes a crumb C having a water content of about 30% while moving on the drainage conveyor 18. 20 is input. Then, the dehydrating device 19 dehydrates the water content to about 10% and carries it out to the next process.
[0014]
Meanwhile, the hot water that is squeezed out later to the barrel 21 of the dewatering device 19 flows down into the collection tank 22, crumb C which squeezed out from the barrel 21 together with the hot water, high-pressure hot water heated to 70 to 90 ° C. blown from the outer peripheral surface of the barrel 21 by the injection, it is collected in the collection tank 22 with the high pressure warm water. Further, the hot water flowing down from the water draining conveyor 18 together with the fine crumb C is also collected in the collection tank 22.
[0015]
The recovery tank 22 is provided with a stirring blade 24 that is rotated by a motor 23, and hot water and crumb C respectively recovered from the water draining conveyor 18 and the dewatering device 19 are stored in the recovery tank 22 by the rotation of the stirring blade 24. The crumb slurry is agitated into crumb slurry, which is returned to the buffer tank 14 side by the pump 25 to reprocess the crumb C that could not be sent to the next process.
[0016]
However, since most of the recovery tank 22 is hot water, it is necessary to supply the hot water in the recovery tank 22 to the hot water tank 12. In this case, the stirring blades 24 are stopped and the specific gravity is higher than that of the hot water. The warm crumbs are lifted up and only hot water is returned from the bottom of the recovery tank 22 to the hot water tank 12 by the pump 25.
[0017]
Thus, for example, the crumb C is scraped off from the outer peripheral surface of the barrel 21 of the dewatering device 19 with high-pressure washing water heated to about 90 ° C., and this is returned from the recovery tank 22 to the buffer tank 14. The temperature drop of the crumb C returned to the tank 14 can be suppressed. That is, when the recovered crumb C is returned to the buffer tank 14, it is possible to prevent a problem that the processing temperature in the buffer tank 14 is greatly lowered.
Note that the recovery tank 22, the pump 25, and a tray part 50, which will be described later, constitute the recovery means in the present invention for returning the crumb C scraped off from the outer peripheral surface of the barrel 21 to the buffer tank 14.
[0018]
FIG. 1 shows a schematic plan structure of the dehydrating apparatus 19 in this embodiment, FIG. 2 shows a cross-sectional structure taken along the line II-II, and FIG. 4 shows a cross-sectional structure taken along the line IV-IV in FIG. That is, a face plate 27 in which eight discharge ports 26 are formed in an annular shape is connected to the other end of the barrel 21 having one end communicating with the hopper 20. A drive motor (not shown) is connected to the other end of the screw shaft 28 whose tip is rotatably supported by the center portion of the face plate 27 so as to penetrate the center of the barrel 21 and the hopper 20 via a speed reducer. Yes. A portion of the screw shaft 28 located in the hopper 20 and the barrel 21 is provided with a plurality of intermittently conveying blades 29 having a lead angle that becomes gentler toward the face plate 27 side. For this reason, the amount of movement of the crumb C per rotation of the screw shaft 28 increases toward the hopper 20 side and decreases toward the face plate 27 side. As a result, the crumb C is gradually compressed while moving in the barrel 21. ing.
[0019]
As shown in FIG. 4 and FIG. 6 showing the shape of the left side surface thereof, a shutter capable of changing the opening area corresponding to each discharge port 26 is attached to the face plate 27 so as to be capable of reciprocating in the radial direction of the face plate 27. It has been. Four of the shutters 30 can open and close the discharge ports 26 by manual operation using screws 31. Further, since the remaining four shutters 30 are configured to open and close the discharge ports 26 by the actuators 32, the discharge ports 26 can be opened and closed even while the dehydrator 19 is moving.
[0020]
The barrel 21 in the present embodiment is provided with a large number of bar members 33 each having an arc shape, and a plurality of bars 33 are provided intermittently along the longitudinal direction so as to surround the bar members 33, and the bar members 33 are bundled in a cylindrical shape. A two-divided disk plate 34 and a conveying blade sandwiched between the two-divided disk plate 34 and sandwiched between bar members 33 located at the upper end and the lower end in FIG. 2 and a pair of knife bars 35 for preventing the crumb C from rotating along with the rotation of the screw shaft 28 in the barrel 21, and the upper and lower ends of the disk plate 34 in FIG. The disc plate along the longitudinal direction of the bar 33 and the two sets of the pressing plate 36 and the nut plate 37 facing each other with the disc plate 34 interposed therebetween. Deployed to 34 and alternately, by the pressing plate 36 located in the upper and lower ends of the disc plate 34 through each of which comprises a fastening bolt 38 screwed into the nut plate 37.
[0021]
As shown in FIG. 5 in which the arrow V portion in FIG. 2 is extracted and enlarged, slit-shaped drainage passages 39 are formed between the bars 33 adjacent to each other in the circumferential direction. The inside of the barrel 21 and the outside of the barrel 21 are in communication with each other through the passage 39. For this reason, as the crumb C is compressed in the barrel 21, the water in the crumb C is squeezed out of the barrel 21 from the drain passage 39. As a result, the crumb C discharged from the discharge port 26 of the face plate 27 is The water content is dehydrated to about 10%.
[0022]
On the side of the barrel 21, a pair of nozzle brackets 40 facing each other with the barrel 21 interposed therebetween are arranged in parallel with the screw shaft 28. Both end portions of these nozzle brackets 40 in the form of rods are rotatably supported via bearing metal 41, respectively. In addition, a nozzle swing motor 42 for swinging these nozzle brackets 40 is connected to one end of each nozzle bracket 40, and the nozzle swing motor 42 whose operation is controlled by a sequencer 43 (see FIG. 3) is rotated. Accordingly, the nozzle bracket 40 swings.
[0023]
The said nozzle bracket 40, a plurality of temperature water injection nozzle 44, respectively facing the surface of the rod 33 located between adjacent disc plates 34 is attached to these warm water injection nozzle 44, respectively temperature A pair of switching chambers 46 communicate with each other via a water supply pipe 45. These switching chamber 46 the hot water is supplied via the high pressure pump 47, opening and closing valve 48 of the plurality of pairs corresponding to the respective temperature water supply pipe 45 is incorporated. Then, in an open state only any pair of on-off valve 48 by a command from the sequencer 43, the warm water injection nozzle 44 to be connected to the hot water supply pipe 45 corresponding to the opening and closing valve 48 of the open state, for example 130 kg / cm ² sprayed onto the surface of the bar 33 to the high-pressure hot water degree opposite to the warm water injection nozzle 44 at a rate per minute 70 liters, the surface of the water drain passage 39 bars 33 crumbs C oozing with water through Is supposed to be removed from.
[0024]
In this case, since the nozzle bracket 40 is rotated by the operation of the nozzle oscillation motor 42, high pressure hot water from the hot water injection nozzle 44 is to be ejected over the substantially entire periphery of the barrel 21, the barrel oozing from 2 1 of entire periphery it can be scraped off reliably crumb C. In this embodiment, each independently because it so as to inject high-pressure hot water viewed hot from a pair of hot water injection nozzle 44, the crumb C from drain passage 39 bleeding amount is large portion and a small place and the And can be cleaned efficiently. Therefore, than when ejecting simultaneously from all hot water injection nozzle 44 a high-pressure hot water of the hot, on can use a small high-pressure pump 47 capacity, since it is able to reduce the consumption of hot water, running Cost can be reduced.
[0025]
Thus, since the high-pressure hot water is sprayed toward the outer circumferential surface of the barrel 21, the periphery of the barrel 21 is surrounded by the scattering prevention cover 49, temperature water of the hot outside the dewatering device 19 is not scattered Consideration is taken. Further, below the scattering prevention cover 49, pan portions 50 for collecting crumbs C removed from the barrel 21 along with temperature water are provided, crumb C and warm water recovery tank collected in the saucer portion 50 22 is discharged.
[0026]
【The invention's effect】
According to the rubber dehydrating apparatus of the present invention, a plurality of hot water pipes to which high-pressure hot water is supplied are arranged in proximity to the barrel along the screw shaft, and a plurality of hot water injection nozzles facing the outer peripheral surface of the barrel are provided. connected to, jetted high pressure hot water from the hot water injection nozzle with respect to crumb oozing with water from the drain passage of the barrel, whereby the recovery means crumbs scraped from the outer peripheral surface of the barrel depending on the buffer tank since the back, it can be again dehydrated this by overlooked off the crumbs from the outer circumferential surface of the automatically barrel without hands. In addition, the crumb that oozes out from the outer peripheral surface of the barrel can be scraped off continuously, so that the dewatering efficiency is improved and stable dewatering work can be continued on the crumb .
[0027]
Further, since the Suyo overlooked off the crumbs from the outer peripheral surface of the barrel in a state where the lower the viscosity of the material using a high-temperature hot water, than methods as conventional mechanical scraping, easily and reliably barrel The crumb can be removed from the outer peripheral surface.
[0028]
Furthermore, by returning high-temperature hot water to the previous process together with the crumb , the thermal energy of this hot water can be used effectively, and an efficient production plant can be realized.
[Brief description of the drawings]
FIG. 1 is a plan view showing a schematic structure of an embodiment of a rubber dehydrating apparatus according to the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a conceptual diagram showing an example of a synthetic rubber manufacturing system in which the rubber dewatering device shown in FIG. 1 is incorporated.
4 is a cross-sectional view taken along arrow IV-IV in FIG.
5 is a cross-sectional view showing an enlarged view of an arrow V portion in FIG. 2. FIG.
6 is a left side view of FIG. 4. FIG.
[Explanation of symbols]
C crumb 10 stirring blade 11 treatment tank 12 hot water tank 13 pump 14 buffer tank 15 motor 16 stirring blade 17 pump 18 draining conveyor 19 dewatering device 20 hopper 21 barrel 22 recovery tank 23 motor 24 stirring blade 25 pump 26 discharge port 27 face plate 28 the screw shaft 29 carrying blade 30 shutter 31 screw 32 actuator 33 rod 34 disc plates 35 knife bar 36 pressing plate 37 nut plate 38 fastening bolt 39 drain passage 40 nozzle bracket 41 bearing alloy 42 nozzle oscillation motor 43 sequencer 44 warm water injection nozzle 45 warm water supply pipe 46 is switched chamber 47 high-pressure pump 48 off valve 49 scattering prevention cover 50 saucer section

Claims (6)

A hopper into which water-containing crumbs are charged from a buffer tank ;
A cylindrical barrel having one end connected to the hopper and a plurality of drainage passages formed radially;
A screw shaft that is housed in this barrel so as to be driven to rotate and is sent out to the other end of the barrel while compressing the crumb thrown from the hopper,
A face plate formed with a discharge port for discharging the dewatered crumb connected to the other end of the barrel and fed to the other end of the barrel;
To scrape the crumbs that are arranged along the screw shaft so as to face the outer peripheral surface of the barrel and that are each supplied with high-pressure hot water and bleed out with water from the drainage passage of the barrel. A plurality of hot water injection nozzles ,
A rubber dewatering device comprising: recovery means for returning the crumb scraped off from the outer peripheral surface of the barrel to the buffer tank .   The rubber dewatering device according to claim 1, further comprising a shutter that is reciprocally mounted in a radial direction of the face plate and that can change an opening area of the discharge port.   2. The apparatus according to claim 1, further comprising a pair of nozzle brackets arranged on the side of the barrel so as to face each other across the barrel in parallel with the screw shaft and to which the hot water spray nozzles are respectively attached. The rubber dehydrator as described.   4. The rubber dehydrating apparatus according to claim 3, further comprising a motor connected to one end of the pair of nozzle brackets, each of which is rotatably supported, and for swinging the nozzle brackets. Introducing a crumb containing water into the barrel from one end of a cylindrical barrel in which a plurality of drainage passages are radially formed;
Sending the dehydrated crumb from the discharge port of the face plate connected to the other end side of the barrel, sending the other side of the barrel while compressing the crumb charged from one end side of the barrel;
Scraping the crumb that bleeds together with water from the drainage passage of the barrel with compression of the crumb in the barrel with high-pressure hot water from the outer peripheral surface of the barrel ;
Recovering crumbs scraped from the outer peripheral surface of the barrel;
And the step of scraping the crumb from the outer peripheral surface of the barrel is performed simultaneously with the step of discharging the dewatered crumb from the discharge port of the face plate. Rubber dehydration method characterized by.   The rubber dewatering method according to claim 5, wherein the hot water is heated to 70 to 90 ° C.

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