JP5809923B2 - Control device for filter press dewatering device, filter press dewatering device, and operation method of filter press dewatering device - Google Patents

Description

  The present invention includes a plurality of filter plates supported so as to be movable between a pressure contact state and a separated state, and a filter cloth formed endlessly by joining both ends of a base fabric formed in a band shape at a joint portion. A filter press dewatering device comprising: a support mechanism that supports the filter cloth so as to be able to travel while being separated from each filter plate in the separated state; and a drive mechanism that causes the filter cloth supported by the support mechanism to travel. The control apparatus of this, the filter press dehydration apparatus provided with the said control apparatus, and the operating method of the said filter press dehydration apparatus.

  Conventionally, various sludge treatment processes such as dewatering sludge generated at water purification plants and sewage treatment plants and separating it into filtrate and cake, or solid-liquid separation processes required in the production process of carbon products, titanium products, etc. Filter press dehydrators are used in the field for solid-liquid separation.

  FIG. 6A shows a conventional filter press dewatering device 80 disclosed in Patent Document 1. In the filter press dewatering device 80, a plurality of filter plates 84 are disposed on a pair of side frames 83 provided between a front frame 81 and a rear frame 82 so as to be slidable between a pressure contact state and a separation state. With the advance operation of the hydraulic cylinder 86 installed in the frame 81, each filter plate 84 is shifted to a pressure contact state pressed in the direction of the rear frame 82 via the pressing member 85 connected to the hydraulic cylinder 86. In accordance with the retraction operation of the hydraulic cylinder 86, each filter plate 84 is configured to shift to a separated state.

  The endless filter cloth 88 is stretched by the support mechanism 87 provided on the filter plate 84 so that the filter surfaces face each other, and a filter chamber is formed by the filter cloth 88 sandwiched between the filter plates 84 in a pressure contact state. In a state where the stock solution is supplied to the filtration chamber, the diaphragm provided in the filter plate 84 is expanded, so that the stock solution is squeezed and separated into solid and liquid. Peel and fall from 88.

  An upper frame 89 is installed between the front frame 81 and the rear frame 82 and in an upper space of each filter plate 84, and a drive roller 90 that runs the filter cloth 88 is wound around the upper frame 89 and is wound up by the drive roller 90. A cleaning mechanism 91 for cleaning the filter cloth 88, a tension mechanism 92 for applying a predetermined tension to the filtered filter cloth 88, and a meandering correction mechanism 93 for regulating the travel position in the width direction of the strained filter cloth 88 are installed. Then, the washed filter cloth 88 is configured to circulate again toward the filter plate 84.

  Such an endless filter cloth is configured by joining both ends of a base cloth formed in a band shape.

  In Patent Document 2, as shown in FIG. 6B, there is a method of forming an endless filter cloth by connecting both ends of a filter cloth 94 with an industrial sewing machine with an upper thread 95a and a lower thread 95b. It is disclosed.

Japanese Patent Laid-Open No. 5-15710 Japanese Patent No. 2930294

  However, the conventional filter press dewatering device is configured to stop running after the filter cloth has traveled, when a time set in advance by a timer or the like, for example, a time that can be washed for one round of the filter cloth has elapsed. In particular, it does not recognize the joint portion of the filter cloth and control its stop position, and has the following problems.

  Since the joint portion of the filter cloth has a configuration in which both ends of the belt-like base fabric are stitched together, the permeability of the filtrate is poor compared to the other surfaces of the filter cloth. Therefore, when a junction part stopped between filter plates, there existed a problem that the filtration efficiency of a pressing target object fell in a junction part.

  Further, in the filter press dewatering device, a pressure of several hundred tons is applied to the pressure contact surface of each filter plate in the pressure contact state of each filter plate.

  If each filter plate is in a pressure contact state with the joints that are stitched and connected to both ends of the filter cloth between the filter plates, a strong pressure is applied to the filter cloth that is sandwiched between the pressure contact surfaces of adjacent filter plates. Therefore, there is a possibility that the joint portion is deformed and the stock solution leaks or the joint portion is damaged. Further, when the thickness of the joint portion is larger than the thickness of the filter cloth, there is a possibility that the filter plate and the diaphragm may be deformed or damaged when pressed between the filter plates.

In addition, because it was not configured to control the stop position of the filter cloth, there are places where the frequency of use is high and low in the endless filter cloth, and clogging, deformation, or breakage occurs in areas where the frequency of use is high. There was a problem that it was likely to occur.

  The present invention provides a control device for a filter press dewatering device, a filter press dewatering device, and a method for operating the filter press dewatering device capable of efficiently using the filter cloth by adjusting the stop position of the endless filter cloth. The purpose is to do.

In order to achieve the above-mentioned object, the characteristic configuration of the control device of the filter press dewatering device according to the present invention is movable between the pressure contact state and the separation state as described in claim 1 of the claims. A plurality of supported filter plates, a filter fabric formed in an endless shape by joining both ends of a base fabric formed in a band shape, and the filter fabric separated from each filter plate in the separated state A control device for a filter press dewatering device, comprising: a support mechanism that supports the vehicle so that it can travel; and a drive mechanism that travels the filter cloth supported by the support mechanism. A position recognizing unit for recognizing the position of the sensor, and operating the drive mechanism in the separated state to cause the filter cloth to run, and the joint recognized by the position recognizing unit becomes a predetermined position other than between the filter plates. And control the stop position of the filter cloth The amount of slip of said filter cloth during running of the filter cloth is measured, is the point that and a travel control unit for correcting the control value for controlling the stopping position of the filter cloth on the basis of the slip amount.

  The travel control unit operates the drive mechanism to run the filter cloth when the filter plates are separated from each other, and causes the dehydrated cake to be separated from between the filter plates. Thereafter, when stopping the filter cloth, the position of the filter cloth joint recognized by the position recognition unit stops the filter cloth at a predetermined position other than between the filter plates. The portion can be prevented from being sandwiched between the filter plates.

Even if the filter cloth extends or slips during traveling and deviates from the feed amount by the drive mechanism, the traveling control unit measures the slip amount of the filter cloth during traveling of the filter cloth, Since it correct | amends so that the said junction part may stop at the predetermined positions other than between the said filter plates based on slip amount, it can avoid reliably that the said junction part stops between the said filter plates.

  Thereby, since the situation which filters at the junction part with the poor permeability | transmittance of a filtrate does not generate | occur | produce, the fall of filtration efficiency can be prevented.

  Since the joining portion is not sandwiched between the pressure contact surfaces of the adjacent filter plates, it is possible to avoid the possibility that the joining portion is deformed and the stock solution leaks or the joining portion is damaged. Furthermore, the risk that the filter plate and the diaphragm are deformed or damaged can be avoided.

  In the second feature configuration, as described in claim 2, in addition to the first feature configuration described above, the travel control unit is a region of the filter cloth that is clamped by the filter plate in the press-contact state. Is that the stop position of the filter cloth is variably controlled so that is uniformly used.

  By variably controlling the stop position of the filter cloth and evenly using the area of the filter cloth that is clamped by the filter plate in the press-contact state, the life of the filter cloth can be reduced compared to the case where the parts used by the filter cloth are biased. Can be extended.

  In the third feature configuration, as described in claim 3, in addition to the first or second feature configuration described above, the position recognition unit has a relative position with respect to the joint portion defined in advance. It is in the point comprised with the sensor which detects the marker provided to cloth.

  The filter cloth is provided with a marker whose relative position with respect to the joint portion is determined in advance, and the position of the joint portion can be recognized by detecting the marker with a sensor.

  As described in claim 4, the fourth characteristic configuration includes a cleaning mechanism that is disposed in a travel path of the filter cloth and that cleans the filter cloth, in addition to the third characteristic configuration described above, The recognition part is in the point installed downstream of the cleaning mechanism.

Sensor as position recognition unit is installed on the downstream side of the cleaning mechanism for cleaning the filter cloth, since the marker is cleaned by the cleaning mechanism, the sensor can reliably detect the marker.

The fifth characterizing feature of the Ri through described in the claim 5, a plurality of filter plate which is movably supported between a pressure contact state and the separated state, the fabric braze is endlessly formed, the separation A control device for a filter press dewatering device, comprising: a support mechanism that supports the filter cloth so as to be able to travel while being separated from each filter plate in a state; and a drive mechanism that causes the filter cloth supported by the support mechanism to travel The position recognition unit for recognizing a specific position of the filter cloth, the filter mechanism is caused to travel by operating the drive mechanism in the separated state, and the filter plate of the filter cloth in the pressure contact state. The stop position of the filter cloth is variably controlled on the basis of the specific position recognized by the position recognition unit so that the area sandwiched between the filter and the filter is traveled. Measure the slip amount of the cloth, and based on the slip amount, It lies in the are and a driving control unit configured to correct the control value for variably controlling the stop position.

  According to the above configuration, when the position recognition unit recognizes a specific position in the filter cloth and runs the filter cloth in the separated state of each filter plate, the stop position of the filter cloth is variably controlled based on the specific position. And by using the area | region clamped by the filter board in a press-contact state among filter cloths uniformly, a lifetime can be extended compared with the case where the part which a filter cloth uses is biased.

In addition, even if the filter cloth extends or slips during travel and deviates from the feed amount by the drive mechanism, the travel control unit measures the slip amount of the filter cloth during travel of the filter cloth. Based on the slip amount, the joining portion is corrected so as to stop at a predetermined position other than between the filter plates, so that the joining portion can be reliably prevented from stopping between the filter plates.

The characteristic configuration of the filter press dewatering device according to the present invention includes a plurality of filter plates that are supported so as to be movable between a press-contact state and a separated state, and a base fabric formed in a band shape as described in claim 6 . cloth both ends braze is formed into an endless shape is joined at the junction, said filter cloth and support mechanism for travelable supported spaced apart from the respective filter plate, which is supported by the support mechanism in the previous SL separated state It is in the point provided with the drive mechanism which makes the said filter cloth run, and the control device provided with any one of the 1st to 5th characteristic composition mentioned above.

  According to the above configuration, the filter cloth can be used efficiently by adjusting the stop position of the endless filter cloth.

The first characteristic configuration of the operation method of the filter press dewatering device according to the present invention is, as described in claim 7 , formed in a strip shape with a plurality of filter plates supported so as to be movable between the pressure contact state and the separation state. A filter cloth formed in an endless shape by joining both ends of the base cloth formed by a joint part, a support mechanism that supports the filter cloth so as to be able to run while being separated from each filter plate in the separated state, and the support mechanism A driving mechanism for running the filter cloth supported by the filter press dehydrating apparatus, and a running step for running the filter cloth by operating the driving mechanism in the separated state; Among the filter cloths, a position recognition step for recognizing the position of the joint portion, and a stop position of the filter cloth so that the joint portion recognized in the position recognition step is a predetermined position other than between the filter plates. And control the filter cloth The slip amount of the filter cloth is measured during line, lies in that it and a stop step of stopping said filter cloth by correcting the control value for controlling the stopping position of the filter cloth on the basis of the slip amount .

As described in claim 8 , the second characteristic configuration includes a plurality of filter plates supported so as to be movable between a pressure contact state and a separation state, a filter cloth formed in an endless manner, and the separation state. In the operation method of the filter press dewatering device, comprising: a support mechanism that supports the filter cloth so as to be able to travel apart from each filter plate; and a drive mechanism that causes the filter cloth supported by the support mechanism to travel. A traveling step of operating the drive mechanism in the separated state to travel the filter cloth, a position recognition step of recognizing a specific position of the filter cloth, and the pressure contact state of the filter cloth in the pressure contact state. as the region sandwiched filtration plate is used equally, on the basis of the recognized the specific position by the position recognition step, as well as variably controlling the stop position of the filter cloth, during running of the filter cloth Measure the slip amount of the filter cloth, To correct the control value for variably controlling the stop position of the filter cloth on the basis of a slip amount, in that it and a stop step of stopping said filter cloth.

  As described above, according to the present invention, by adjusting the stop position of the endless filter cloth, the control device for the filter press dewatering apparatus that can efficiently use the filter cloth, the filter press dewatering apparatus, and the filter press A method of operating a dehydrator can be provided.

Schematic of filter press dewatering device according to the present invention Schematic of filter press dewatering device according to the present invention Illustration of filter cloth connection Schematic of the control device of the filter press dewatering device according to the present invention Schematic explaining the replacement of filter cloth It is explanatory drawing of the conventional filter press dehydration apparatus, Comprising: (a) is schematic and (b) is explanatory drawing of filter cloth.

  Below, the control apparatus of the filter press dehydration apparatus by this invention, the filter press dehydration apparatus, and the operating method of a filter press dehydration apparatus are demonstrated.

  As shown in FIGS. 1 and 2, the filter press dewatering device 1 includes a front frame 2, a rear frame 3, and a pair of side frames 4 that are installed between the front frame 2 and the rear frame 3. .

  A plurality of filter plates 20 are slidably supported on the side frame 4, and each filter plate 20 is separated from the separated state shown in FIG. 1 by the advance / retreat mechanism 5 installed in the front frame 2. It is comprised so that it may move to either of two states with the press-contact state shown in 2.

  On the front and back sides of each filter plate 20, a pair of engagement pins 11 are vertically provided, and the engagement pins 11 of a pair of adjacent filter plates 20 are engaged with a long hole formed in the connecting metal fitting. They are connected by a combined link mechanism 12. The left end filter plate 20 is connected to the rear frame 3, and the right end filter plate 20 is connected to the advance / retreat mechanism 5.

  The advance / retreat mechanism 5 is composed of a hydraulic cylinder 5c having a pressing member 5b at the tip of a rod 5a. When the rod 5a is advanced by the hydraulic cylinder 5c, each filter plate 20 shifts to a pressure contact state pressed toward the rear frame 3 via the pressing member 5b, and when the rod 5a is retracted, the front frame 2 is moved. Each of the filter plates 20 moves toward it, and shifts to a separated state separated by a distance defined by a long hole formed in the connection fitting.

  A driving roller 6 for feeding out the endless filter cloth 7 is disposed on the upper part of the front frame 2, and a cleaning mechanism 8 for cleaning the filter cloth 7 is disposed on the upper part of the rear frame 3.

The filter cloth 7 fed out by the drive roller 6 is adjusted to a predetermined tension by the tension mechanism 9 similarly installed in the front frame 2, and then the filter surfaces are opposed to each other by the support mechanism 10 provided in each filter plate 20. In the separated state, the filter cloth 7 is supported so as to be separated from the respective filter plates 20, and is arranged so as to be guided to the cleaning mechanism 8 after being fed out from each filter plate 20.

  The tensioning mechanism 9 includes a plurality of fixed rollers fixed to the front frame 2 and a plurality of moving rollers that approach and separate from the fixed roller, and the moving roller approaches and separates from the fixed roller, A predetermined tension is applied to the filter cloth 7. The predetermined tension refers to a tension that allows the drive roller 6 and the filter cloth 7 to run stably without slipping.

  In order for the filter cloth 7 to be stably conveyed by the drive roller 6, it is necessary that a sufficient tension is applied before and after the drive roller 6. Since the tension of the filter cloth is adjusted to an appropriate value by the tension mechanism 9 on the downstream side of the driving roller 6 that becomes smaller, the filter cloth 7 is stably driven by the driving roller 6 and is installed on the downstream side of the filter board. It will be transported toward 20.

  The support mechanism 10 includes a lower roller 10a and an upper roller 10b supported by brackets fixed to the filter plates 20, and the filter cloth 7 is stretched vertically between the adjacent filter plates 20 by both rollers 10a and 10b. ing.

  In the vicinity of the upper roller 10b, a guide roller 10c for guiding the filter cloth 7 so as not to contact the filter plate 20 and the diaphragm 22 when the filter plate 20 is separated is provided.

  Each filter plate 20 is provided with a diaphragm 21 on one surface along the arrangement direction. When the filter plate 20 shifts to the pressure contact state by the advance / retreat mechanism 5, a filter chamber is formed in a space partitioned by the diaphragm 21 and the back surface of the adjacent filter plate 20. At this time, the space partitioned by the filter cloth 7 in the filter chamber becomes the filtration chamber.

  A base 13 is provided between the filter plates 20, and a through hole formed through the base plate 13 in the thickness direction of the filter plate 20 is communicated with the base 13 in a pressure contact state. Then, the processing object is supplied to the through-hole from the supply port provided in the rear frame 3 in the pressure contact state, and the processing object is filled into each filtration chamber via the branch path formed in the base 13.

  In a pressure contact state of each filter plate 20, pressurized water is supplied from a pressurized water flow path provided below each filter plate 20, and a diaphragm 21 attached to the filter plate 20 is inflated toward the filter chamber, thereby processing objects. Is squeezed.

  In the separated state in which the advance / retreat mechanism 5 is retracted after the dehydration process, a driving process is performed in which the filter cloth 7 travels a predetermined distance by the drive roller 6 in order to separate the dehydrated cake from the filter cloth 7. The advance operation is performed, and the same processing is repeated. The drive roller 6 is drivingly connected to a drive motor via a speed reduction mechanism, and the drive mechanism is constituted by the drive roller 6, the speed reduction mechanism, and the drive motor.

  The filter cloth 7 fed out from the last-stage filtration unit 20 is washed by the washing mechanism 8 provided in the rear frame 3 and then passed over the drive roller 6 via the meandering correction mechanism 15.

  The meandering correction mechanism 15 is installed in the upper frame 14 attached to the upper part of the front frame 2 and travels in the width direction of the filter cloth 7 based on a signal from a sensor (not shown) that detects meandering of the filter cloth 7. Correct the position.

  The upper frame 14 is provided with a filter cloth changing mechanism 16. An example of the filter cloth changing mechanism 16 will be described later.

  As shown in FIG. 3, the filter cloth 7 is formed in an endless shape by joining both end portions 7a and 7b of a base fabric made of a resin such as polypropylene formed in a band shape at a joining portion 7c.

  The joint portion 7c is formed of a resin or metal so-called lacing, and includes a plurality of loops 7d and 7e and pins 7f respectively provided at the end portion 7a and the end portion 7b of the base fabric, and the loop 7d and the loop 7e. The end 7a and the end 7b are joined by inserting the pins 7f in a state where they are alternately engaged with each other.

  The filter cloth 7 is provided with a marker 7g at a position where a relative position with the joint 7c is determined in advance. The marker 7g is made of, for example, a thin metal plate and is stored in a pocket formed on the surface of the filter cloth 7.

  The filter press dewatering device 1 is provided with a sensor at a location along the travel path of the filter cloth 7 where the marker 7g can be detected. The sensor may be a non-contact type sensor, for example, a capacitive proximity sensor, and the installation position is more clean because the filter cloth 7 is cleaned on the downstream side of the cleaning mechanism 8. This is preferable in that the marker 7g can be reliably detected.

  In addition, the thin metal plate used for the marker 7g can prevent misdetection of the sensor by using a metal different from the metal contained in the pressing object. For example, when iron is contained in the object to be compressed, aluminum may be used for the marker.

  FIG. 4 shows an outline of the control device 30 of the filter press dewatering device 1.

  The control device 30 controls the advancing / retreating mechanism 5 to switch the advancing / retreating control unit 31 that switches between the pressure contact state and the separation state of each filter plate 20, and the supply pump of the object to be squeezed to the filtration chamber in the pressure contact state of each filter plate 20. Among the filter cloth 7, a supply control unit 32 that controls driving / stopping, a pressure control unit 33 that controls driving / stopping of a pressurized water supply pump that inflates the diaphragm 21 to the filter chamber side in order to squeeze the object to be compressed. A position recognition unit 34 for recognizing the joint 7c as an example of a specific position, a travel control unit 35 for driving the filter cloth 7 by operating the drive roller 6 in the separated state, and the filter cloth 7 when the filter cloth 7 is traveling. A tensioning mechanism control unit 36 that controls the position of the moving roller of the tensioning mechanism 9 so that a predetermined tension is applied, a cleaning control unit 37 that controls driving / stopping of a cleaning water supply pump of the cleaning mechanism 8, and a filter cloth Meander detection sensor that detects 7 meanders Based on, the meandering correction mechanism 15 includes a meandering correction control unit 38 for controlling the correction of the meandering of the filter cloth 7, is configured to perform the operation of the filter press dewatering device 1. Each control unit is constituted by a sequencer or a microcomputer.

The position recognition unit 34 and the travel control unit 35 will be described in detail.
Since the relative position between the marker 7g provided on the filter cloth 7 and the joint portion 7c is known in advance, the position recognition unit 34 detects the marker 7g applied to the filter cloth 7 with the proximity sensor, whereby the joint portion 7c is detected. Can be recognized.

  When the position recognition unit 34 recognizes the position of the joint portion 7 c while the filter cloth 7 is traveling, the travel control unit 35 determines that the joint portion 7 c is in a position other than the space between the filter plates 20 when the filter plates 20 are pressed. Thus, the drive roller 6 is controlled to stop.

  The traveling control unit 35 includes a timer. When the position recognizing unit 34 recognizes the position of the joint 7c, the traveling control unit 35 starts counting of the timer. What is necessary is just to comprise so that stop control of the drive roller 6 may be performed after progress of time which will be in positions other than 20 intervals.

  The travel control unit operates the drive roller 6 when each filter plate 20 is separated to cause the filter cloth 7 to travel so that the dewatered cake is separated from between the filter plates 20 and the rear cloth 7 is stopped. Since the position of the joint portion 7c of the filter cloth 7 recognized by the position recognition unit 34 stops the filter cloth 7 at a predetermined position other than between the filter plates 20, the joint portion 7c is connected to each filter plate in the pressure contact state of each filter plate 20. It can prevent being pinched between 20.

  Thereby, since the situation which filters by the junction part 7c does not generate | occur | produce, the fall of filtration efficiency can be prevented.

  Since the joining portion 7c is not sandwiched between the pressure contact surfaces of the adjacent filter plates 20, it is possible to avoid the possibility that the joining portion 7c is deformed and the stock solution leaks or the joining portion 7c is damaged. Furthermore, the possibility that the filter plate 20 and the diaphragm 21 are deformed or damaged can be avoided.

  Furthermore, the traveling control unit 35 uses the filter cloth 7 as a reference based on the position of the joint 7c recognized by the position recognition unit 34 so that the region where the filtration chamber is formed is used evenly. 7 stop position may be variably controlled.

  By variably controlling the stop position of the filter cloth 7, the part used for the filtration of the filter cloth 7 in the area other than the joint 7c is shifted, and the area of the filter cloth 7 where the filtration chamber is formed is evenly distributed. Since it is used, the life of the filter cloth can be extended as compared with the case where the part used by the filter cloth is biased.

  A roller that is not driven by the power of the drive motor like the drive roller 6 but is rotated as the filter cloth 7 travels, for example, a fixed roller of the tension mechanism 9, a moving roller, and other cleaning mechanisms 8 are provided. By detecting the rotation of the roller with a sensor such as a rotary encoder and comparing it with the number of rotations of the driving roller 6, the amount of slip generated when the filter cloth 7 travels can be measured.

  Even if the filter cloth 7 extends or slips during traveling and shifts with respect to the feed amount by the driving roller 6, the travel control unit 35 slips the filter cloth 7 during travel of the filter cloth 7. Since the joining portion 7c is corrected so as to stop at a predetermined position other than between the filter plates 20 based on the slip amount, it is reliably avoided that the joining portion 7c stops between the filter plates. Can do.

  Of the filter cloth 7 supported by the support mechanism 10 by the filter press dewatering device 1 and the control device 30 configured as described above, the position recognition step for recognizing the position of the joint portion 7c, and the separation state of each filter plate 20 And a stop step in which the joint 7c recognized in the position recognition step stops the filter cloth 7 at a predetermined position other than between the filter plates 20. The driving method is executed.

  Further, the operation method of the filter press dewatering apparatus includes a position recognition step for recognizing a specific position among the filter cloths supported by the support mechanism 10, and the filter cloth 7 by operating the driving roller 6 in the separated state of the filter plates 20. The stop position of the filter cloth 7 is determined based on the specific position recognized in the position recognition step so that the traveling step and the area where the filtration chamber is formed in the filter cloth 7 are used evenly. And a stop step that is variably controlled.

  As shown in FIG. 5, the filter cloth replacement mechanism 16 includes, for example, a winding roller 16 a for the used filter cloth 7 and a feeding roller 16 b for a new filter cloth 17. The take-up roller 16a is configured to be driven by a motor (not shown) to take up the filter cloth.

  The replacement work of the filter cloth 7 eliminates the joining of the joining portion 7c of the filter cloth 7, connects the end portion 7a at the foremost direction in the traveling direction to both ends of the winding roller 16a, and ends the end portion 7b at the end in the traveling direction. Are joined to the front end of the new filter cloth 17 placed on the feed roller 16b, at the front end in the traveling direction.

  When the take-up roller 16a and the drive roller 6 are driven in this state, the new filter cloth 17 is moved to the drive roller 6, the tension mechanism 9, the filter cloth support mechanism 10, and the cleaning as the used filter cloth 7 is taken up. It is made to travel to the filter cloth changing mechanism 16 through the mechanism. When the foremost end portion of the new filter cloth 17 in the traveling direction reaches the vicinity of the filter cloth changing mechanism 16, the joining of the used filter cloth 7 and the new filter cloth 17 is canceled, and the new filter cloth 17 is moved forward of the traveling direction. The end portion and the last end portion are joined to form an endless filter cloth 17.

  According to the present invention, since there is no possibility that the joint 7c of the used filter cloth 7 is deformed or damaged, a new filter cloth can be easily connected, and the replacement work is facilitated.

  In the above-described embodiment, the example in which the marker is a thin aluminum plate has been described. However, any sensor may be used as long as the sensor can be distinguished from the contents of the compressed object.

  The proximity sensor is not limited to a capacitance type, and a known sensor such as an inductive or magnetic proximity sensor or a photosensor can be used.

  In the above-described embodiment, the configuration in which the specific position of the filter cloth 7 is the filter cloth joint 7c has been described, but the specific position is not limited to the case of the filter cloth joint 7c. When the joint portion 7c is not provided, an arbitrary specific position of the filter cloth is set in advance, and the traveling control unit is configured to variably control the stop position of the filter cloth based on the specific position. By doing so, since the area | region where a filtration chamber is formed among filter cloths is used equally, a lifetime can be extended compared with the case where the same location of a filter cloth is repeatedly used for filtration.

  The position recognition unit 34 includes a storage unit in which the position of the joint 7c is stored in advance, and a measurement unit 40 that measures the travel distance of the filter cloth 7 based on the diameter and the rotational speed of the drive roller 6. The storage unit The position of the joint portion 7c may be recognized based on the travel distance of the filter cloth 7 measured by the measurement unit from the position of the joint portion 7c stored in the above.

  The position recognition unit 34 recognizes the position of the joint 7c based on the travel distance of the filter cloth 7 measured by the measurement unit from the position of the joint 7c stored in the storage unit. It is not necessary to detect a marker provided with a position relative to the part 7c. Since it is not necessary to provide the marker 7g provided on the filter cloth 7 and the proximity sensor for detecting the marker 7g, the cost can be reduced.

  Each of the above-described embodiments is an example of the present invention, and the present invention is not limited by the description. The specific configuration of each part can be appropriately changed and designed within the range where the effects of the present invention are exhibited. Needless to say.

1: filter press dewatering device 2: front frame 3: rear frame 4: side frame 5: advance / retreat mechanism 6: drive roller 7: filter cloth 7a, 7b: end 7c: joint 7g: marker 8: cleaning mechanism 9: tension Mechanism 10: Support mechanism 20: Filter plate 30: Control device 34: Position recognition unit 35: Travel control unit

Claims (8)

A plurality of filter plates supported movably between the pressure contact state and the separation state;
A filter cloth formed in an endless shape by joining both ends of the base fabric formed in a belt shape at the joint,
A support mechanism for supporting the filter cloth so as to be able to travel apart from each filter plate in the separated state;
A drive mechanism for running the filter cloth supported by the support mechanism;
A control device for a filter press dewatering device comprising:
Among the filter cloths, a position recognition unit for recognizing the position of the joint part;
In the separated state, the drive mechanism is operated to run the filter cloth, and the stop position of the filter cloth is controlled so that the joint recognized by the position recognition unit is at a predetermined position other than between the filter plates. And a travel control unit that measures a slip amount of the filter cloth during travel of the filter cloth and corrects a control value for controlling a stop position of the filter cloth based on the slip amount ;
A control device for a filter press dewatering device.   2. The filter press according to claim 1, wherein the travel control unit variably controls a stop position of the filter cloth so that a region of the filter cloth that is sandwiched between the filter plates in the press-contact state is evenly used. Control device for dehydrator.   The control device for the filter press dewatering device according to claim 1, wherein the position recognition unit is configured by a sensor that detects a marker attached to the filter cloth, the relative position of the position recognition unit being determined in advance. It is arranged in the travel route of the filter cloth, and has a cleaning mechanism for cleaning the filter cloth,
The control device for a filter press dewatering apparatus according to claim 3, wherein the position recognition unit is installed downstream of the cleaning mechanism. A plurality of filter plates supported movably between the pressure contact state and the separation state;
An endless filter cloth,
A support mechanism for supporting the filter cloth so as to be able to travel apart from each filter plate in the separated state;
A drive mechanism for running the filter cloth supported by the support mechanism;
A control device for a filter press dewatering device comprising:
Of the filter cloth, a position recognition unit that recognizes a specific position;
The position recognition unit recognizes the filter cloth to run by operating the drive mechanism in the separated state and to use evenly the region of the filter cloth that is clamped by the filter plate in the pressure contact state. The filter cloth stop position is variably controlled on the basis of the specified position, the slip amount of the filter cloth is measured during travel of the filter cloth, and the filter cloth stop position is determined based on the slip amount. A travel control unit configured to correct a control value for variably controlling the vehicle;
A control device for a filter press dewatering device. A plurality of filter plates supported movably between the pressure contact state and the separation state;
A filter cloth formed in an endless shape by joining both ends of the base fabric formed in a belt shape at the joint,
A support mechanism for supporting the filter cloth so as to be able to travel apart from each filter plate in the separated state;
A drive mechanism for running the filter cloth supported by the support mechanism;
And which filter press dewatering apparatus comprises a control device according to any one of claims 1 5. A plurality of filter plates supported movably between the pressure contact state and the separation state;
A filter cloth formed in an endless shape by joining both ends of the base fabric formed in a belt shape at the joint,
A support mechanism for supporting the filter cloth so as to be able to travel apart from each filter plate in the separated state;
A drive mechanism for running the filter cloth supported by the support mechanism;
An operation method of a filter press dewatering apparatus comprising:
A running step of running the filter cloth by operating the drive mechanism in the separated state;
Of the filter cloth, a position recognition step for recognizing the position of the joint portion;
The stop position of the filter cloth is controlled so that the joint recognized in the position recognition step is a predetermined position other than between the filter plates, and the slip amount of the filter cloth is measured when the filter cloth is running. A stop step for stopping the filter cloth by correcting a control value for controlling the stop position of the filter cloth based on the slip amount ;
A method for operating a filter press dewatering apparatus. A plurality of filter plates supported movably between the pressure contact state and the separation state;
An endless filter cloth,
A support mechanism for supporting the filter cloth so as to be able to travel apart from each filter plate in the separated state;
A drive mechanism for running the filter cloth supported by the support mechanism;
An operation method of a filter press dewatering apparatus comprising:
A running step of running the filter cloth by operating the drive mechanism in the separated state;
A position recognition step for recognizing a specific position of the filter cloth;
The stop position of the filter cloth is made variable based on the specific position recognized in the position recognition step so that the area sandwiched between the filter plates in the pressure contact state of the filter cloth is evenly used. In addition to controlling , the slip amount of the filter cloth is measured during travel of the filter cloth, the control value for variably controlling the stop position of the filter cloth is corrected based on the slip amount, and the filter cloth is stopped. A stop step;
A method for operating a filter press dewatering apparatus.