JP2006102588A - Cake peeling device of filter press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the cake peeling device of a filter press capable of efficiently peeling even a lightweight cake by performing the rising and falling of filter cloth by an air cylinder. <P>SOLUTION: Support bars (12) are inserted in the air cylinders (11) erected on both shoulder parts (5a) of a filter plate (5) to suspend the filter cloth (14) from the support bars (12). At the time of opening of the filter plate, air in the air cylinders (11) is released to lower the support bars (12) at a stroke to allow the support bars (12) to impinge against excitation bars (8). Since the peeling of cake is performed by this impingement, the lowering of the support bars (12) is reliable even with a lightweight cake and even the lightweight cake can be perfectly peeled. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to an improvement of a filter press that simultaneously opens a large number of parallel filter plates to peel a cake from a filter cloth, and in particular, a peeling that peels cakes by oscillating easily removable filter cloths suspended between filter plates all at once. It relates to the improvement of the apparatus.

  After filtering and dewatering the undiluted solution with a filter press, as a method of peeling the dehydrated cake from the filter cloth and discharging it outside the machine, in the filter press described in Patent Document 1, the filter surface is covered with a filter cloth, and the filter cloth The filter cloth suspension rod attached to the upper edge of the filter plate is suspended from the upper end of the filter plate by a spring. When discharging the cake, the filter plates are opened one by one in order, and the filter cloth A sequential plate-type filter press is shown in which a hitting member is moved up and down by an air cylinder, vibration is applied to the filter cloth, and the cake is peeled off from the filter cloth.

  Further, in the filter press described in Patent Document 2, a column with springs is erected on the upper shoulders of the parallel filter plates, a support bar is inserted and supported on the column, and a filter cloth is attached to the column. This is a filter press that is suspended. When the cake is discharged, each filter plate is opened to open the filtration chamber, and the spring is compressed by its own weight, and the cake is peeled off by colliding with the lower vibration bar. Furthermore, the cake that remains without being peeled off from the filter cloth is pulled up with an air cylinder and brought into contact with the support bar, and the cake is peeled off by vibrating the filter cloth with a vibrator arranged on the vibration bar. A filter press is shown.

Japanese Patent Laid-Open No. 06-269611 JP-A-10-99607

  However, the conventional filter press described above has the following problems. In the sequential open plate type filter press described in Patent Document 1, members such as a portal frame and an air cylinder have to be disposed on the upper portion of the filter press in order to raise and lower the filter cloth tapping member, which increases the overall height. . And it is necessary to widen the opening dimension between filter plates in order to give vibration to the filter cloth by hitting the filter cloth. Further, since the filter cloth is fixed at the center portion of the filter plate, vibration is hardly transmitted to the lower half of the filter cloth, and it is difficult to completely peel the cake.

  In the simultaneous open plate type filter press described in Patent Document 2, the filter cloth is simply suspended from the support bar, and can be easily attached and detached. In order to discharge the cake, the plate is simply opened, the spring is compressed by the weight of the cake, and the filter cloth vibrates by the reaction, and the cake is peeled off from the filter cloth. The cake attached to the filter cloth is not peeled off only by the reaction of the spring, and the filter cloth is vibrated by a vibrator to be peeled off. However, in this peeling method, if the cake weight is not more than the set value, the compression force of the spring is insufficient, the vibration of the filter cloth is small, and the cake peeling cannot be performed well. Moreover, since the impact at the time of cake peeling acts on both shoulder parts of the filter plate, it is necessary to increase the strength of both shoulder parts. For this reason, when dehydrating a stock solution having a light cake weight, it was necessary to change to a spring having weak elasticity. And in order to vibrate a filter cloth with a vibrator, the vibration bar had to be lifted with an air cylinder and had to be brought into contact with the support bar.

  The present invention solves the above-mentioned problems of the prior art, and a cake peeling device for a filter press according to the present invention opens and closes on a pair of horizontal guide rails supported on a front frame and a rear frame. In a filter press comprising a plurality of freely arranged filter plates and a filter cloth suspended so as to cover the filtration floor surfaces of these filter plates, an air cylinder is erected on the filter plate, and the air cylinder By inserting the support bar into the support bar, the support bar can be raised and lowered.

  The air cylinder is built in a head metal fixed to both shoulders of the filter plate, and the support bar is slidably supported by a guide shaft extending from a piston rod of the air cylinder, and the filter The vibration bar provided on both sides of the press has both end portions that come into contact with and separate from each other. The support bar is provided with a filter cloth position detecting device for confirming the separation from the vibration bar, and it is confirmed that the cake is completely peeled from the filter cloth.

In the case of an air cylinder type that lifts and lowers the filter cloth by air pressure instead of the conventional vibration method by the spring, the cake peeling device for the filter press according to the present invention arbitrarily adjusts the support force of the filter cloth by the supply air pressure. The filter cloth can be lifted and lowered completely even with a light cake, and the cake can be peeled off reliably. And when the cake is peeled off as in the spring type, the load of cake, filter cloth, support bar, etc. is not applied to the filter plate shoulder at a stretch, and there is no need to increase the strength of the filter plate shoulder. Also, if the air pressure to raise the filter cloth after peeling the cake is set to the weight in the state where the cake is completely peeled off, the cake adhering to the filter cloth without being peeled should be A certain filter cloth can be easily detected, and can be forced to vibrate by a vibrator, and even a light cake can be completely peeled off.

  The cake peeling apparatus according to the present invention is configured as described above, and covers a plurality of filter plates arranged in parallel in an openable / closable manner on a pair of horizontal guide rails, and covers the filtration floor surfaces of these filter plates. In a filter press in which a filtration chamber is formed with a filter cloth suspended on the filter cloth, if the stock solution is supplied to the filtration chamber between the closed filter plates, the filtrate passes through the filter cloth and is discharged to the outside. The solid matter captured by the filter cloth is dehydrated while forming a cake layer. In this way, when the dehydration operation of the stock solution press-fitted into the filtration chamber is completed, a cake is formed between adjacent filter cloths. At this time, the filter cloth is suspended from the support bar, and a guide shaft extending vertically from the piston rod of the air cylinder standing on both shoulders above the filter plate is slidable on the support bar. It is inserted.

  Next, when the filter plate is opened, the filter cloth and the cake and the support bar attached to the filter cloth are supported by the piston rod of the air cylinder. Subsequently, if the air in the air cylinder is released to the outside, the filter cloth, cake, and support bar will drop together with the piston rod due to their own weight. Then, both ends of the support bar collide with the vibration bar, and the descent stops. Due to the impact of the collision with the vibration bar, the entire filter cloth vibrates up and down, and the cake is peeled off from the filter cloth. At this time, since the position of the upper end portion of the vibration bar is set to be slightly higher than the upper end portion of the piston rod, the load of the filter cloth / cake / support bar is not applied to the air cylinder. Therefore, in the conventional spring type, since the entire load is applied to the spring, it is necessary to increase the strength of the filter plate shoulder, but in the air cylinder type of the present invention, this is not necessary.

  After peeling the cake, air is supplied into the air cylinder to raise the filter cloth and the support bar. The air pressure at this time is set to a pressure that only raises the filter cloth and the support bar. If the filter cloth with the cake left unpeeled is overloaded, it will not rise. And the presence or absence of the filter cloth which has not risen is detected by the photoelectric switch type filter cloth position detection device arranged in the filter press. If there is a filter cloth that has not risen, the vibrator can be driven to vibrate the vibration bar, the filter cloth that has not risen can be forcibly vibrated, and the remaining cake can be peeled off. Hereinafter, embodiments of a cake peeling apparatus for a filter press according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, a filter press 1 according to the present invention has a pair of parallel guide rails 4 supported by a front frame 2 and a rear frame 3. The guide rail 4 is fixed to the left and right side walls of the front frame 2 and the rear frame 3, and a plurality of filter plates 5 arranged in parallel between the guide rails 4 are placed so as to be able to move forward and backward. A movable head 6 is disposed behind the filter plate 5 in the last row, and is placed on the guide rail 4 so as to be able to move forward and backward in the same manner as the filter plate 5. The movable head 6 is connected to a tightening cylinder 7 supported by the rear frame 3, and is moved back and forth on the guide rail 4 by expanding and contracting the tightening cylinder 7. Further, a pair of vibration bars 8 are arranged on the front frame 2 and the rear frame 3 in parallel with the guide rail 4. A vibrator 9 is provided in the vicinity of the central portion of the left and right vibration bars 8 so as to vibrate the vibration bars 8.

  Next, based on FIGS. 2-6, the cake peeling apparatus of this invention is explained in full detail. As shown in FIG. 2, the head metal 10 is fixed to the shoulders 5a at both ends of the upper surface of the filter plate 5 with bolts. An air cylinder 11 is built in the head metal 10 and stands upright. A support bar 12 is inserted into the air cylinder 11 and is slidably supported. If air is supplied from the air supply port 13 provided in the lower part of the air cylinder 11, the support bar 12 will rise, and if the air in the air cylinder 11 is open | released to air | atmosphere, the support bar 12 will fall.

  FIG. 3 is a front view showing a state where the support bar 12 is raised by supplying air from the air supply pipe 13a into the air cylinder 11 which is erected on the head metal 10. FIG. In this state, the support bar 12 and the vibration bar 8 are not in contact with each other, and a predetermined gap is provided. A bag portion is provided on the upper edge portion of the filter cloth 14, a filter cloth core 15 is inserted into the bag portion, and the filter cloth core 15 is hooked on a latch 12 a provided on both surfaces of the support bar 12. Filter cloths 14 are suspended on both sides of the filter plate 5.

  FIG. 4 is an enlarged cross-sectional view of the air cylinder 11 with the support bar 12 raised. Air supplied from the air supply port 13 below the air cylinder 11 flows into the piston tube 16 and moves the piston 17. Raise. A packing 17a is fitted over the entire circumference of the piston 17 so as to prevent leakage of air in the piston tube 16. A piston rod 18 having a diameter smaller than the piston diameter extends vertically from the upper portion of the piston 17, and a cover 19 of the head metal 10 is loosely fitted to the piston rod 18 to prevent the piston 17 from being pulled out. is doing. A scraper 20 is fitted over the entire inner periphery of the cover 19 to prevent dust, dirt, etc. adhering to the piston rod 18 from entering the piston tube 16. Further, a buffer material 21 is attached to the lower end portion of the piston rod 18 over the entire circumference so as to absorb an impact caused by a collision with the cover 19 when the piston 17 is raised. A guide shaft 22 having a diameter smaller than that of the piston rod 18 extends from the upper portion of the piston rod 18, and the support bar 12 is slidably inserted through the guide shaft 22. The lower surface portion of the support bar 12 is supported by the upper surface portion of the piston rod 18, and the support bar 12 is raised by the piston rod 18. The upper half of the guide shaft 22 is threaded 22a, and a nut 23 is screwed to prevent the support bar 12 from falling off.

  FIG. 5 is a front view showing a state where the air in the air cylinder 11 is released to the atmosphere and the support bar 12 is lowered. The lowering of the support bar 12 stops by contacting the vibration bar 8. At this time, by releasing the air in the air cylinder 11 at once, both ends of the support bar 12 collide with the vibration bar 8 due to the weight of the support bar 12, the filter cloth 14 and the cake, and the filter cloth 14 is affected by the impact. The cake adhering to the filter cloth 14 is peeled off by vibrating up and down.

  FIG. 6 is an enlarged cross-sectional view of the air cylinder 11 with the support bar 12 lowered. By releasing the air in the piston tube 16 from the air supply port 13 to the atmosphere, the piston 17 has its own weight and the lower end of the piston tube 16. To descend. At this time, the support bar 12 also descends simultaneously due to its own weight, but the stop position is a position where the lower surface of the support bar 12 and the upper surface of the vibration bar are in contact, and the lower surface of the support bar 12 and the upper surface of the piston rod 18 Is provided with a predetermined gap. As described above, the impact load due to the lowering of the support bar 12, the filter cloth 14 and the cake is not applied to the air cylinder 11 at all, and the impact load is not applied to the head metal 10, that is, the shoulder 5 a of the filter plate 5. For this reason, it is not necessary to reinforce the shoulder portion 5a of the filter plate 5 as compared with the conventional spring-type cake peeling method.

  FIG. 7 is a front view of a conventional cake peeling apparatus using a spring. When the filter plate 50 is opened after the filtration / dehydration process is completed, all the loads of the support bar 51, filter cloth 52, cake, etc. are applied to the spring 53 at once, and the spring 53 expands and contracts to vibrate the filter cloth 52 up and down. It is made to peel from the filter cloth 52. FIG. At this time, even if the support bar 51 is lowered, it does not come into contact with the vibration bar 54, and the above-described total load is applied to the head metal 55 through the spring 53. For this reason, it is necessary to increase the strength of both shoulder portions 50a of the filter plate 50, and they are reinforced. In the method using the spring 53, if the cake weight is not equal to or greater than the set value, the spring 53 does not expand and contract and the cake cannot be sufficiently peeled off. Therefore, the spring 53 having elasticity corresponding to the cake weight must be replaced. I must. Further, in order to peel off the cake remaining on the filter cloth 52 without being peeled off, the vibration bar 54 is vibrated with a vibrator (not shown) while the vibration bar 54 is vibrated with an air cylinder (not shown). By pulling upward, the vibration of the vibrator and the vibration of the spring 53 are transmitted to the filter cloth 52, and the remaining cake is peeled off. As described above, an air cylinder for pulling up the vibration bar 54 upward is necessary.

  Next, the filter cloth position detection device 24 will be described in detail with reference to FIGS. 8 and 9. In this embodiment, the filter cloth position is detected by a transmissive photoelectric switch, but a wired detection device such as a wire can also be used. A pair of light projectors 24a are disposed at both upper ends of the front frame 2 of the filter press 1, and a pair of light receivers 24c are disposed at both upper ends of the rear frame 3 to receive the projection light 24b emitted from the light projector 24a. Yes. The light projection 24b is irradiated in parallel with the guide rail 4, and is received by a light receiver 24c facing each other. In FIG. 8, all the support bars 12 are raised to the normal position, and the light projection 24b irradiated from the light projector 24a is incident on the light receiver 24c. In this state, the cake is surely peeled. In FIG. 9, since there is a support bar 12 that has not risen to the normal position, the light projection 24b is blocked by the support bar 12 and is not incident on the light receiver 24c. This indicates that the cake is not completely peeled off, and an abnormality such as the cake remaining on the filter cloth 14 remains.

The operation of the air cylinder 11 will be described with reference to FIG. The pressure reducing valve (A) 25 is set to an air pressure (normal pressure) that can raise the support bar in a state where a cake is formed in the filtration chamber. The pressure reducing valve (B) 26 is set to an air pressure (low pressure) that can raise the support bar only when there is no cake. The solenoid valve (A) 27 is provided for switching between normal pressure and low pressure, and the solenoid valve (B) 28 is provided for supplying air into the air cylinder 11 or exhausting it. The solenoid valve (A) 27 and the solenoid valve (B) 28 are opened when not energized and closed when energized. Reference numeral 29 denotes an air filter.
I. In order to raise and hold the filter cloth position during the plate opening process, the air pressure uses the normal pressure of the pressure reducing valve (A) 25. At this time, the solenoid valve (A) 27 and the solenoid valve (B) 28 are in an open (non-energized) state.
B. In the cake peeling process, if the solenoid valve (A) 27 and the solenoid valve (B) 28 are energized, the solenoid valve (A) 27 is switched to a low pressure, and the solenoid valve (B) 28 is energized simultaneously with the air in the air cylinder 11. Is released into the atmosphere at once, and the cake is peeled off.

C. Subsequently, low-pressure air is supplied into the air cylinder 11 in order to confirm whether the cake is completely peeled off by the filter cloth position detection step. At this time, the solenoid valve (A) 27 is energized and the solenoid valve (B) 28 is not energized. Then, the position of the support bar 12 is detected by the filter cloth position detection device 24 described above. If all the support bars 12 are raised to the normal position, the process proceeds to the next step.
D. If there is an abnormality, the process moves to the vibration peeling process. First, the air in the air cylinder 11 is released to the atmosphere and the support bar 12 is lowered. With the support bar 12 in contact with the vibration bar 8, the vibration bar 8 is vibrated with the vibrator 9, and the filter cloth 14 is removed. Forcibly vibrate to peel off the remaining cake. Then, low-pressure air is supplied again into the air cylinder 11, and the position of the support bar 12 is detected by the filter cloth position detection device 24. If there is an abnormality, the above operation is repeated, and if normal, the process proceeds to the next closing plate process.
E. In the closing plate process, the normal pressure of the pressure reducing valve (A) 25 is used as the air pressure in order to raise and hold the filter cloth position. At this time, the solenoid valve (A) 27 and the solenoid valve (B) 28 are in an open (non-energized) state.

  Since the cake peeling device of the filter press of the present invention works reliably even with a cake having a light weight, it can be applied to filter presses for filtering and dehydrating stock solutions in various fields. And it can utilize as a cake peeling apparatus of all kinds of filter presses, such as all-chamber simultaneous opening type filter press, sequential opening type filter press, and multiple chamber simultaneous opening type filter press.

It is a side view of the filter press concerning the present invention. It is a principal part enlarged view of the cake peeling apparatus which concerns on this invention. It is a front view at the time of a raise of the cake peeling apparatus which concerns on this invention. It is the principal part enlarged view at the time of the raise of the cake peeling apparatus which similarly concerns on this invention. It is a front view at the time of the descent | fall of the cake peeling apparatus which concerns on this invention. It is the principal part enlarged view at the time of the descent of the cake peeling apparatus which similarly concerns on this invention. It is a front view of the conventional cake peeling apparatus. It is a model side view of the filter press which provided the filter cloth position detection apparatus concerning the present invention, and shows that a support bar exists in a normal position. It is a model side view of the filter press which similarly provided the filter cloth position detection apparatus which concerns on this invention, Comprising: It shows that a support bar exists in an abnormal position. It is an air system diagram of the cake peeling apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filter press 2 Front frame 3 Rear frame 4 Guide rail 5 Filter plate 5a Shoulder part 8 Excitation bar 10 Head metal 11 Air cylinder 12 Support bar 14 Filter cloth 18 Piston rod 22 Guide shaft 24 Filter cloth position detection apparatus

Claims (4)

On a pair of horizontal guide rails (4) supported by the front frame (2) and the rear frame (3), a plurality of filter plates (5) arranged in parallel to be openable and closable, and these filter plates (5 ) In a filter press (1) provided with a filter cloth (14) suspended so as to cover the filtration floor surface, an air cylinder (11) is erected on the filter plate (5), and the air cylinder (11 ), The support bar (12) can be moved up and down by inserting the support bar (12) into the cake. The cake peeling device for a filter press according to claim 1, wherein the air cylinder (11) is built in a head metal (10) fixed to both shoulders (5a) of the filter plate (5). The support bar (12) is slidably supported by a guide shaft (22) extending from the piston rod (18) of the air cylinder (11) and is attached to both sides of the filter press (1). The cake stripping device for a filter press according to claim 1 or 2, wherein the vibration bar (8) has both end portions that come into contact with and separate from each other. The filter press (1) is provided with a filter cloth position detection device (24) so that the support bar (12) confirms the separation from the vibration bar (8). The cake peeling apparatus of the filter press of any one of thru | or 3.

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