JP5800239B2 - Opening / closing device and opening / closing method of filter plate in filter press - Google Patents

Description

The present invention relates to an opening / closing device for filter plates arranged in parallel in a filter press for treating water sewage sludge, sewage sludge, industrial wastewater sludge, etc., and a hydraulic pressure having the same stroke as a filter plate opening / closing stroke arranged in parallel along a guide rail The present invention relates to a switchgear using a cylinder.

A large number of filter plates arranged in parallel in the horizontal direction are moved to the left and right with the central part as the boundary, and a hydraulic cylinder for opening and closing these filter plates is attached along the guide rails hanging the filter plates, Patent Document 1 discloses a technique in which the stroke of the hydraulic cylinder and the stroke of opening and closing the filter plate are overlapped to shorten the length of the machine.

Further, in the filter press configured to open and close by moving left and right with the central portion of the filter plate row as a boundary, a movable head is provided on the outer side of each of the left and right filter plate rows, and these movable heads are arranged along the filter plate row. Japanese Patent Application Laid-Open Publication No. 2005-259542 describes a connection device that is connected with a fastening tool provided on the head and a driving device that operates in a direction in which the movable heads approach each other.
By doing in this way, the filter plate row | line | column between both movable heads is narrowed, and the filtration chamber which can endure high pressure is formed. The force for clamping the filter plate is received by a hydraulic cylinder connected to the movable head attached so as to sandwich the filter plate row with a connector, and thus a strong guide rail is not required as in the prior art.

Japanese Utility Model Publication No. 62-34569 Japanese Patent Laid-Open No. 3-118806

In the conventional filter press or cited document 1, as a means for fastening the filter plate row suspended on the guide rail 4, a frame and a movable head are installed on both sides of the filter plate row so as to sandwich them, and this movable head is attached to the guide rail at the time of fastening. In this state, the hydraulic cylinder attached to the movable head is extended and tightened. With this configuration, a reaction force and a moment are generated in the movable head or the guide rail to which the movable head is fixed. Therefore, a strong guide rail that can withstand this reaction force is required.

In the filter press as in the above cited reference 2, the filter plate row center position in the filter plate open state and the closed state is not concentrated at a predetermined position due to a difference in load or sliding friction resistance, and the filter plate is opened and closed. Filter plate stop position at time may not be constant. For example, when the filter plate is opened, if one movable head moves greatly due to a load difference or the like with the filter press center position as a reference, the filter plate may be biased to one side and the filter plate sliding speed may be The phenomenon of moving at a speed exceeding the speed occurs. This is a situation that should be avoided in filter press operation. To further explain this phenomenon, the moving speeds when both movable heads at the same position as the both ends of the filter plate row are equally opened and closed are ideally V1 = V1 and V2 = the other. In this state, the filter plate rows open and close evenly, and the center position of the filter plate rows is constant. When the moving speeds of both movable heads exceed the allowable value as in the previous example, if one moving head stops due to a load difference or the like and the speed becomes zero, the speed of the other moving head is the hydraulic cylinder opening / closing speed ( V1 + V2). When the opening / closing speed of the movable head is increased in this way, the sliding speed of the filter plate is increased in the same manner as the moving head moving speed. The moving speed of the filter plate is set to V1 and V2 as the maximum allowable filter plate sliding speed in order to open and close the filter plate evenly. Therefore, if there is a difference in moving speed between the two movable heads, the high speed side will exceed the maximum allowable sliding speed of the filter plate, which may lead to the problem of rattling and galling at the sliding portion of the filter plate. Garage.

Similarly, when only one movable head is moved when the filter plate is closed, the filter plate center position is shifted from a predetermined position (usually set to the filter press center position) when the plate is completed. For this reason, a detrimental effect that a biased load is applied to the guide rail or the like is caused.
Even if the chain is evenly opened and closed by hanging the chain or the like, there is a problem that a strength sufficient to withstand tension or the like is required and a large filter press requires a long chain.
This invention solves the problem that when the parallel filter plates are opened and closed, the filter plate cannot hold the predetermined position due to the difference in load and sliding frictional resistance, and the problem that the allowable filter plate sliding speed cannot be maintained. A filter plate opening and closing device in a filter press that prevents the backlash and galling of the filter plate row, which can sometimes occur, and that always keeps the center position of the filter plate row at a predetermined position without generating excessive stress on the guide rail. An opening / closing method is also provided.

The filter plate opening / closing device in the filter press according to the present invention slidably supports a large number of filter plates on a pair of guide rails whose ends are bridged to a stand, and a movable head is arranged at both ends of the parallel filter plate rows. and set, the end portion after the hydraulic cylinder the cylinder tube connected to one of the removable head, in a filter press which is connected the tip end of the piston rod to the other removable head, the positions of both ends of the filter plate columns to open and close The detector to be measured, the position adjustment device that moves the filter plate row along the guide rail together with the move valve head and the hydraulic cylinder, and the center position of the filter plate row is calculated based on the measured value of the detector. and have a, and a control unit for calculating a difference value between the predetermined position set between the stand, transfer the filter plate columns central position by the position adjusting device based on the difference value to a predetermined position Since the cause, when opening and closing the plate parallel to the filter plates, to solve the problems filter plates due to the difference in such load difference can not be stopped at a predetermined position.
In the position adjusting device, a pinion gear of a drive source connected to a cylinder tube of a hydraulic cylinder is fitted to a rack bar disposed along a guide rail. Or the pinion gear of the drive source arrange | positioned at the guide rail is fitted by the rack bar connected with the cylinder tube of the hydraulic cylinder.
As a detector for specifying the opening / closing position of the filter plate row, transmitters are arranged at both ends of the movable head or the hydraulic cylinder sandwiching the filter plate row, and the reference receiving unit is provided at one place on the guide rail or at both stands. Arrange. By moving the center position of the filter plate array to a predetermined position based on the detected distance, the moving speeds of both movable heads can be made uniform, and rattling and galling of the filter plate sliding portion can be prevented. .
By setting the predetermined position as the center position of the filter press, the center position of the filter press is always vertically coaxial with the center position of the filter plate row, so that a biased load is not applied to the guide rail or the like.

The filter plate opening and closing device and the opening and closing method in the filter press according to the present invention are provided with a movable head on both sides of the filter plate row, and a hydraulic cylinder as a filter plate opening and closing device connected to both movable heads. It is the structure which expands-contracts in the direction along. And by measuring the distance from the filter press center position to both movable heads, the position of the filter plate opening / closing device composed of hydraulic cylinders is controlled in the opening / closing direction, and the center position of the filter plate row is held at a fixed position. The load of the filter plate or the like on the guide rail can be balanced to reduce the weight of the guide rail member. In addition, since the maximum allowable sliding speed of the filter plate is maintained, the speed of the sliding open / close plate of the filter plate array can be increased, and the miscellaneous time in the dehydration process can be shortened, thus improving the filtration capacity of the dehydrator. It becomes possible to do.

  When the filter plate is centered at a predetermined position when the filter plate is closed, for example, when it is operated so as to always keep the filter press center position, the stress and moment generated by the filter plate row and movable head load become uniform in the guide rail part. It works preferentially against fatigue fracture and plastic fracture. Depending on the form of the filter press, it may be possible to stop at a biased position instead of the center position. However, this control can sufficiently cope with that case.

It is a side view at the time of the filter plate closing of the opening / closing apparatus of the filter press which concerns on this invention. Similarly, it is a detailed view of the position adjusting device. Similarly, it is a figure which shows the positional relationship of a detector. Similarly, it is a filter press side view at the time of a filter plate closing plate. Similarly, it is a filter press side view in the filter plate opening.

The filter press according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of the filter press opening and closing device according to the present invention when the filter plate is closed. In the filter press 1, a large number of filter plates 5 are supported in parallel on a pair of guide rails 4, 4, and the guide rails 4, 4 are bridged by front and rear stands 2, 2. A pair of movable heads 7 and 8 are arranged at both ends of the filter plate 5 in parallel with the guide rail 4, and the filter plate row 5... And the movable heads 7 and 8 are connected to each other by a chain (not shown). A large number of filter plates 5 can be opened at predetermined intervals.
A hydraulic cylinder 9 is juxtaposed along the guide rail 4, and the rear end portion of the cylinder tube 10 of the hydraulic cylinder 9 is connected to one movable head 7 and the front end portion of the piston rod 11 is connected to the other movable head 8 by a connecting tool. It is.
The hydraulic cylinder 9 sets the total length when the piston rod 11 is contracted to the distance between the movable heads 7 and 8 when the filter plate row 5 is closed, and the length of the hydraulic cylinder 9 when the piston rod 11 extends. The distance between the movable heads 7 and 8 when the parallel filter plate 5 is opened is set.

Hydraulic cylinders 9 of filter plate rows 5... Are connected to the guide rail 4 by a position adjusting device 12. The filter plate row 5... Can be opened / closed along the guide rail 4 by the hydraulic cylinder 9, and the hydraulic cylinder 9 is moved by the position adjusting device 12 in the filter plate opening / closing direction, that is, the hydraulic cylinder extending / contracting direction. The center position of the filter plate row can be moved to a predetermined position. In addition, the filter press 1 is provided with a detector 16 having a transmitter 16a and a receiver 16b in order to specify the positions of both ends of the filter plate row 5... Are disposed at both ends of the movable heads 7 and 8 or the hydraulic cylinder sandwiching the... And the receiving unit 16b as a reference is disposed at one place on the guide rail or at both the stands 2 from the transmitting unit 16a to the receiving unit 16b. Detect the distance. The value detected by the detector is transmitted to the control unit, and the control unit calculates the positions of both ends of the filter plate array by comparing the distance difference from the transmission unit to the reception unit or a preset reference value. After calculating the positions of both ends of the filter plate row, the center position of the filter plate row that is the midpoint of the filter plate row is specified. Then, a difference value ( deviation ) between the predetermined position and the filter plate row center position is calculated, and an instruction is given to the position adjusting device to move the filter plate row by the difference value, and the filter plate row center position is always moved to the predetermined position. The configuration is to let

FIG. 2 is a detailed view of the position adjusting device of the opening / closing device of the filter press according to the present invention. The position adjusting device 12 has a structure in which the hydraulic cylinder 9 is movable in the filter plate row opening / closing direction. This embodiment is obtained by arranging the gear device having a Piniongi A 14 to be fitted thereto on the cylinder tube side mounting the rack bar 13 to the guide rail side. When the pinion gear 14 is rotated, the gear with the rack bar 13 is engaged, and the hydraulic cylinder 9 can be moved along the guide rail 4.
As an inverse configuration, it is possible to gearing having Piniongi A 14 to be fitted thereto with the guide rail side mounting the rack bar 13 in the cylinder tube side.
The guide rail 4 and the movable heads 7 and 8 may be connected by the position adjusting device 12 if the filter plate row 5 is movable.
The drive source 15 of the position adjusting device 12 includes an electric motor drive and a hydraulic motor drive.
Further, since the purpose of the position adjusting device 12 is an error correcting movement between the predetermined position and the center position of the filter plate row, there are other methods such as a hydraulic cylinder for adjusting the position and an air cylinder as the driving source 15.

FIG. 3 is a diagram showing a positional relationship of detectors of the opening / closing device of the filter press according to the present invention. Detectors 16 are provided at arbitrary positions of the movable heads 7 and 8 and the filter press 1 in order to detect the positions of both ends of the filter plate row 5... The position of the transmitter 16a provided on the movable heads 7 and 8 at both ends of the filter plate row is set as a and b, and the position of the receiver 16b provided at an arbitrary position of the filter press is set as d and the filter from the movable heads 7 and 8 A distance to an arbitrary position d of the press 1 is detected. The position information of the arbitrary position d is stored in the control device 6 in advance as a reference position.
The center position of the filter plate row is c, the distance from the movable heads 7 and 8 to an arbitrary position d is ad and bd, and the predetermined position is e. It is assumed that ad is a positive direction from a to d, and bd is a positive direction from b to d. The distance between ad and bd is measured , the positions of both ends of the current filter plate row 5... are specified by the control device 6 , the filter plate row center position c is calculated, and deviates from a predetermined position e. If so, the hydraulic cylinder 9 is moved by the position adjusting device 12.
As shown in FIG. 3 (A), the receiving unit 16b is set at one position on the guide rail, and as shown in FIG. 2 can also determine the positions of both ends of the filter plate row 5...
As shown in FIG. 2, the transmitting portion 16 a may be attached to the rear end of the cylinder tube and the front end of the piston rod instead of the movable heads 7 and 8.
Although the position sensor etc. which can detect a relative distance are used as the detector 16, if the relative distance is detectable, the system of a sensor will not be chosen especially.

As shown in FIG. 1, in the filter press 1 that moves the filter plate rows 5 that are supported in parallel on the guide rail 4 and that can move in the opening and closing direction by moving the hydraulic cylinders, ideally, the opening and closing plates are equal in both directions. The filter plate row center position c is required to be at the filter press center position. However, a phenomenon occurs in which one movable head 7 moves more than the other movable head 8 due to a difference in filter plate row load or the like. In that case, the filter plate row center position c at the time of the opening and closing plate moves, and a shift occurs between the filter plate row center position c and the filter press center position. In order to prevent this displacement, the predetermined position e is set to the center position of the filter press, and the filter cylinder row center position c is always set by moving the hydraulic cylinder 9 in the counter displacement direction until the displaced distance becomes zero. Since a certain position is held, this can be solved.

FIG. 4 shows a situation in which the filter plate is closed when the filter plate is closed, and the predetermined position e (filter press center position) and the filter plate row center position c are shifted. The position d of the receiving unit 16b of the detector 16 is coaxial with the predetermined position e.
If the movable head 7 moves more than the movable head 8 due to a load difference or the like when the filter plate is closed, the distance of ad becomes smaller than the distance of bd.
In this state, the center position c of the filter plate row is moved in the b direction. In order to align the center position c of the filter plate array with the predetermined position e, the center position c may be moved in a direction opposite to the direction in which the center position is shifted by a half of the difference between the distances a and b to d. In other words, in this case, if the filter plate row 5... Is moved by (bd-ad) / 2 in the a direction by the position adjusting device 12, the filter plate row center position c coincides with the predetermined position e.
Similarly, when the movable head 8 moves more than the movable head 7, the filter plate row center position c moves in the direction a, so that the filter plate row 5 ... is moved in the b direction by (ad-bd) / 2. If moved, the filter plate row center position c coincides with the predetermined position e.

FIG. 5 shows a state in which the predetermined position e (filter press center position) and the filter plate row center position c are shifted while the plate is biased when the filter plate is opened.
If the movable head 7 moves more than the movable head 8 due to a load difference or the like when the filter plate is opened, the distance of ad becomes larger than the distance of bd.
In this state, the filter plate row center position c is moved in the direction a. In order to align the center position c of the filter plates with the predetermined position e, the center position c may be moved in the direction opposite to the direction in which the center position is shifted by a half of the difference between the distances a and b to d. That is, in this case, the filter plate row center position c coincides with the predetermined position e by moving the filter plate rows 5... In the b direction by (ad−bd) / 2 by the position adjusting device 12.
Similarly, when the movable head 8 moves more than the movable head 7, the filter plate row center position c moves in the b direction, so that the filter plate row 5... Is moved in the a direction by (bd-ad) / 2. If moved, the filter plate row center position c coincides with the predetermined position e.

The control of the position adjusting device 12 is performed by the control device 6 connected to the drive source 15 as shown in FIG.
The ad and bd detected by the detector 16 may be transmitted to the control device 6 for comparison and moved to move the filter plate rows 5. The driving source 15 continues to drive until ad = bd, and if there is no difference, the filter plate row center position c coincides with the predetermined position e, so that the driving method is terminated. By performing the above control while expanding and contracting the hydraulic cylinder 9, it is possible to always keep the filter plate row 5 at a fixed position.

The filter press 1 according to the present invention is configured as described above, and the predetermined position e where the filter plate center position c at the time of the opening and closing plate stays is the filter press center position. The detector 16 is disposed at the center of the side surface of the movable heads 7 and 8 and at the filter press center position d on the side surface of the guide rail using a position sensor (reception unit, transmission unit) . The three points are coaxially horizontal. The position sensor transmits a signal to the control device 6, and the control device 6 controls the position adjustment device 12 from the signal. The opening / closing plate process of the filter plate 5 is as follows.

A. Closing step A-1. Closed plate start Movable heads 7 and 8 that are slidable on the guide rail 4 are connected to both ends of the hydraulic cylinder. By moving the hydraulic cylinder 9, the movable heads 7 and 8 are moved inward, and the filter plate 5 Close and tighten the plate.
A-2. Distance detection
At the same time as the hydraulic cylinder contracts , the position sensor is located at a distance from the filter head center position d to the filter head center position d by the transmission section disposed at the movable heads 7 and 8 and the reception section disposed at the filter press center position d. ad and bd are detected, and detected value data is transmitted to the control device 6.
A-3. The distance calculation control device 6 compares the received detection values ad and bd. The control device 6 calculates an error distance (difference value) between the filter plate row center position c and the filter press center position by (ad−bd) / 2.
A-4. The signal output control device 6 compares ad and bd. When ad> bd, the hydraulic cylinder 9 is moved by a difference value (ad−bd) / 2 in the b direction. When ad <bd , the difference value (bd -Ad) A drive signal is transmitted to the position adjusting device 12 that moves the filter plate rows 5.
A-5. Position Adjustment The position adjustment device 12 receives the signal and is driven to keep the filter plate row center position c at the filter press center position. The position adjustment device 12 eliminates the difference between ad and bd by moving the filter plate row 5... By the received difference value . By driving the position adjusting device 12 simultaneously with the filter plate closing plate, the filter plate row center position c is corrected and moved to the filter press center position during the filter plate closing plate.
A-6. A-2 to A-5 are repeated until the closing of the closing plate 5 is completed. When the filter plate 5 is closed and the correction drive is completed and the filter plate row center position c coincides with the filter press center position, the plate closing process is ended.

B. Opening Step The opening step performs the same control as the closing step, and always keeps the filter plate row center position c at the filter press center position.
B-1. Opening plate opening The hydraulic cylinder 9 is extended to push the movable heads 7 and 8 outward, and the filter plate 5 is opened at regular intervals. The cake is discharged downward by opening the filter plate 5.
B-2. Distance detection
At the same time as the hydraulic cylinder contracts , the position sensor is located at a distance from the filter head center position d to the filter head center position d by the transmission section disposed at the movable heads 7 and 8 and the reception section disposed at the filter press center position d. ad and bd are detected, and detected value data is transmitted to the control device 6.
B-3. The distance calculation control device 6 compares the received detection values ad and bd. The control device 6 calculates an error distance (difference value) between the filter plate row center position c and the filter press center position by (ad−bd) / 2.
B-4. The signal output control device 6 compares ad and bd. When ad> bd, the hydraulic cylinder 9 is moved by a difference value (ad−bd) / 2 in the b direction. When ad <bd , the difference value (bd -Ad) A drive signal is transmitted to the position adjusting device 12 that moves the filter plate rows 5.
B-5. Position Adjustment The position adjustment device 12 receives the signal and is driven to keep the filter plate row center position c at the filter press center position. The position adjustment device 12 eliminates the difference between ad and bd by moving the filter plate row 5... By the received difference value . By driving the hydraulic cylinder position control device simultaneously with the filter plate opening, the filter plate row center position c is corrected and moved to the filter press center position during the filter plate opening.
B-6. B-2 to B-5 are repeated until the opening of the filter plate 5 is completed. When the opening of the filter plate 5 is completed, the correction drive is also completed, and the filter plate row center position c coincides with the filter press center position, the plate opening process ends.

The filter plate opening / closing device and the opening / closing method in the filter press according to the present invention are generated at the time of driving by performing a control to detect the deviation of the filter plate row center position and to correct the filter plate row center position to a predetermined position. Stress can be minimized. Moreover, the filter plate opening and closing plate can be evenly performed on both sides. Accordingly, it is possible to reduce the weight and cost of the parts.

1 filter press 2 stand 4 guide rails 5 filter plates 6 controller 7, 8 removable head 9 hydraulic cylinder 10 the cylinder tube 11 the piston rod 12 a position adjusting device 14 Piniongi A 15 drive source 16 detector 16a transmitting unit 16b receiving portion

Claims (6)

A large number of filter plates (5) are slidably supported on a pair of guide rails (4, 4) bridged at both ends by stands (2, 2), and both ends of the parallel filter plate rows (5 ...) by disposing the removable head (7, 8) to and connected to one of the removable head ends after the cylinder tube (10) of the hydraulic cylinder (9) (7), above end portions of the piston rod (11) In the filter press connected to the other movable head (8),
A detector (16) for measuring the positions of both ends of the filter plate row (5 ...) to be opened and closed ;
A position adjusting device (12) for moving the filter plate array (5 ...) along the guide rail together with the move valve head (7, 8) and the hydraulic cylinder (9) ;
Based on the measurement value of the detector (16) , the filter plate row center position (c) is calculated, and the difference value between the filter plate row center position (c) and the predetermined position (e) set between the stands (2, 2). It has a control unit (6), for calculating a,
A filter plate opening / closing device in a filter press, wherein the position adjusting device (12) moves the filter plate row center position (c) to a predetermined position (e) based on the difference value . The position adjusting device (12) includes a rack bar (14) in which a pinion gear (14) of a drive source (15) connected to a cylinder tube (10) of a hydraulic cylinder (9) is disposed along a guide rail (4). The filter plate opening and closing device in the filter press according to claim 1, wherein the filter plate is fitted to 13). The position adjusting device (12) includes a rack bar (13) in which a pinion gear (14) of a drive source (15) disposed on a guide rail (4) is connected to a cylinder tube (10) of a hydraulic cylinder (9). The filter plate opening and closing device in the filter press according to claim 1, wherein the filter plate is fitted to the filter press.   As a detector (16) for specifying the open / close position of the filter plate row (5...), A movable head (7, 8) or a hydraulic cylinder sandwiching the filter plate row (5. 4. The device according to claim 1, wherein the receiving portions (16 b) provided at both ends are arranged at one place on the guide rail or at both stands (2). 5. The opening / closing device of the filter plate in the filter press as described. A large number of filter plates (5) are slidably supported on a pair of guide rails (4, 4) bridged at both ends by stands (2, 2), and both ends of the parallel filter plate rows (5 ...) The movable head (7, 8) is disposed on the front end of the cylinder tube (10) of the hydraulic cylinder (9) and connected to one movable head (7). The rear end of the piston rod (11) In the filter press connected to the other movable head (8),
Measure the position of both ends of the filter plate row (5 ...) to be opened and closed with the detector (16) ,
Filter plate bank center position (c) is calculated by the control unit (6) based on measurements of the detector (16),
The controller (6) calculates the difference value between the filter plate row center position (c) and the predetermined position (e) set between the stands (2, 2),
A filter plate opening / closing method in a filter press, wherein the position adjustment device (12) moves the filter plate row center position (c) to a predetermined position (e) based on the difference value . The method for opening and closing a filter plate in a filter press according to claim 5, wherein the predetermined position (e) is a filter press center position.

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