JP5294090B2 - Filter cloth hanging device in filter press - Google Patents

Description

The present invention relates to a technology for peeling a cake by vibrating a filter cloth, and particularly to a filter cloth suspending device in a filter press that improves the peelability of a cake with a simple configuration.

Conventionally, in a filter press in which a large number of filter plates with filter cloths stretched on their front and rear surfaces are movably arranged in parallel on guide rails bridged between the front and rear frames, and a number of filter plates are opened and closed simultaneously. A pair of filter cloths provided between the plates are suspended in a swingable manner, and an excitation shaft is disposed below the support bar on which the filter cloths are suspended. An elevator and a vibration device are attached to the excitation shaft. The provided technique is disclosed in Patent Document 1.

In addition, a vibration shaft is arranged below the support bar on which the filter cloth is hung, and a bag portion is formed at the lower end of the filter cloth, and a weight is inserted by attaching the bag portions before and after the filter plate. This technique is disclosed in Patent Document 2.

Furthermore, a technology in which a pair of leaf spring members are fixed upward at the top of each filter plate, the leaf spring member and the filter cloth are connected by a string-like member, and the filter cloth is suspended along the filtration surface of the filter plate. Is disclosed in Patent Document 3.

Japanese Utility Model Publication 7-21204 No. 7-28888 No. 4-3605

In Patent Document 1, when the filter plate is opened, the filter cloth descends due to the cake load adhering to the filter cloth and peels off by impact. Also, if the vibrating shaft is vibrated while being gradually raised, the filter cloth is lifted upward while being vibrated together with the support bar, and the filter cloth that is difficult to filter is raised upward, and the remaining cake is peeled off. Promote.
However, the filter cloth is pulled away from the uneven surface of the filter plate by pushing up the filter cloth with the vibration shaft. Since a large number of filter cloths are vibrated at the same time, if the filter press is increased in size, the vibration device is also increased in size to push up a large number of filter cloths, which requires a large amount of power.

In Patent Document 2, when the filter plate is opened, the filter cloth is pulled away from the uneven surface of the filter plate due to the cake load and the weight attached to the filter cloth and lowered. Part of the cake is peeled off by the impact, and the filter cloth support bar compresses the spring when lowered, so that the filter cloth is pushed up by the repulsive force, and the remaining cake peels off by the impact.
However, if the filter cloth only vibrates up and down, it is difficult to completely peel off cakes with poor peelability that adhere to the filter cloth or thin cakes from the filter cloth, resulting in large acceleration. A vibrating device is required.

Patent Document 3 discloses that when a filter plate is opened, a vibration is promoted by the leaf spring member by applying vibration to any of the leaf spring member, the string member, or the filter cloth of the filter plate, and the string member. The filter cloth vibrates along the filtration surface of the filter plate. The vibration facilitates the peeling of the cake attached to the filter cloth, and smoothly peels from the filter cloth.
However, if the amplitudes of the pair of leaf springs erected on the filter plate do not match, the vibrations cancel each other, resulting in a smaller vibration and a shorter vibration generation time. Moreover, since the string-like member is subjected to the tensile and compressive stress from the leaf spring and the load of the filter cloth and the cake, a large strength is required and it is difficult to form the elastic member. Furthermore, since the lower end portion of the filter cloth is fixed to the filter plate, there is a problem that the vibration amplitude is weak below the filter cloth and the peelability is poor.

The present invention provides a filter cloth suspending device in a filter press that can be easily peeled off from a filter cloth with a simple configuration even with a cake having poor peelability.

The gist of the filter cloth suspending device in the filter press according to the present invention is a suspension device in which an upper filter cloth rod that hangs a filter cloth is locked to a filter cloth mandrel on the upper part of a filter plate that is openable and closable. In the filter press where the filter cloth is installed and stretched on the filtration floor surface of the front and back of the filter plate, a support column is erected in the upper center of the filter plate, and the filter cloth core is inserted and supported in the support column. The upper filter cloth rod is locked in the vicinity of the mandrel support and the upper filter cloth rod is made of an elastic member, so that the load of cake and other materials adhering to the filter cloth is applied to the upper filter cloth rod at the same time as the filter plate is opened. Both ends are bent downward with the engaging portion as a fulcrum. Since the upper filter cloth rod is made of an elastic member, the upper cloth cloth rod is repelled upward when reaching the lower end point, and by repeating this action, the filter cloth is vibrated up and down, and the cake is peeled off.

If the filter cloth mandrel is slidably inserted into the support column, a spring is inserted around the lower periphery of the support column, and the filter cloth mandrel is swingably supported by the spring, it will resonate with the vibration of the upper filter cloth rod. Amplifies the amplitude and generates a large acceleration during vibration to promote cake peeling.

Under the filter cloth mandrel both ends, if the vibration bar is bridged up and down along the filter plate row and a vibration device is installed on the vibration bar, if a cake that does not peel easily remains on the filter cloth, The vibration bar can efficiently vibrate the filter cloth through the upper filter cloth rod, and the filter cloth can be regenerated without using cleaning water.

If a filter cloth position detection device that detects the descending position of the filter cloth mandrel is provided when the filter plate is opened, it is possible to detect the occurrence of an abnormality such as cake remaining on the filter cloth.

If the filter cloth core is made of an elastic member, the upper filter cloth rod can be locked in the vicinity of both ends of the filter cloth core, and the load applied to the upper filter cloth rod can be dispersed.

The filter cloth suspending device in the filter press according to the present invention is configured as described above, and can be reduced in weight with a simple configuration that does not require an increase in the size of the device.
Specifically, since the filter cloth vibrates along the filtration surface, the opening distance between the filter plates can be reduced, and the filter press can be downsized. In addition to uniform vertical vibrations on the entire surface of the filter cloth, different vibrations can be applied to the central portion and the side portions, and cakes with poor peelability can be easily peeled off. Furthermore, if the elastic member for hanging the filter cloth is supported by an elastic body such as a spring, vibration can be amplified and the peelability can be improved.

1 is a schematic side view of a filter press having a filter cloth suspending device according to the present invention. Similarly, it is a sectional side view of the hanging device for the filter cloth. Similarly, it is a front view of the hanging device for the filter cloth. Similarly, it is a front view of a filter cloth. Similarly, it is a principal part enlarged view of the hanging apparatus of a filter cloth. It is a sectional side view of the hanging device of the filter cloth concerning other embodiment. It is a front view of the hanging apparatus of the filter cloth concerning other embodiment. It is a principal part enlarged view of the hanging apparatus of the filter cloth concerning other embodiment. It is a model side view of the filter press which provided the filter cloth position detection apparatus which concerns on this invention, Comprising: It shows that a filter cloth exists in a normal position. 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 filter cloth exists in an abnormal position.

The filter cloth suspending device in the filter press according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic side view of a filter press having a filter cloth suspending device, and the filter press 1 according to the present invention includes: A pair of parallel guide rails 4 supported by the front frame 2 and the rear frame 3 are supported.
The guide rail 4 has a filter plate 5 having a filtration floor 5a on the front and back, a suspension device 6 disposed on the top of the filter plate 5, and a suspension device 6 that is suspended on the filtration floor 5a. A plurality of filter cloths 7 are attached. The plurality of filter plates 5 are placed on the guide rail 4 so as to be able to move forward and backward.
An opening / closing device 8 is supported on the rear frame 3, the filter device 5 is closed by extending the opening / closing device 8 and pressing the movable head 9 toward the front frame 2, and between the closed filter plates 5, 5. When the stock solution is supplied to the filtration chamber 10, the filtrate passes through the filter cloth 7 and is discharged to the outside. The solid matter captured by the filter cloth 7 is dehydrated while forming a cake layer in the filtration chamber 10.
After dehydration, the opening / closing device 8 is contracted to open the filter plate 5. The filter plates 5 can be simultaneously opened at a predetermined interval determined by the connecting link 11. And the cake in the filtration chamber 10 is dropped and discharged out of the machine. The opening / closing device 8 that opens and closes the filter plate 5 may be a hydraulic cylinder, an electric cylinder, or the like.

As shown in FIG. 2, a concave filtration floor 5 a is formed on the front and back of each filter plate 5. The filtration bed surface 5a partitions the filtration chamber 10 with the opposite filtration bed surfaces 5a of the adjacent filter plates 5 when the filter plate 5 is closed. A filter cloth 7 is stretched on the filtration floor 5 a on the front and back of the filter plate 5, and the upper part of the filter cloth 7 is supported by an upper filter cloth rod 12. As shown in FIG. 4, bag portions 7 a and 7 b are respectively provided at the upper end portion and the lower end portion of the filter cloth 7, and the upper filter cloth rod 12 is provided at the upper bag portion 7 a and the lower bag portion 7 b. A weight 13 for tensioning the filter cloth 7 is inserted into each.

As shown in FIG. 3, a pair of support columns 14, 14 are erected in the central portion above the filter plate 5, and the filter cloth core 15 is slidably inserted by the support columns 14, 14. A spring 16 is interposed on the outer periphery of the lower portion of the support 14, and the filter cloth core 15 is supported by the support 16 so as to be swingable.

A support 17 as an engaging portion of the upper filter cloth rod 12 is fixed to the front and rear surfaces of the filter cloth core 15. As shown in FIG. 5, the support 17 holds the upper filter cloth rod 12 inserted through the bag portion 7 a in a state where the filter cloth 7 is suspended so as to cover the upper and lower filtration floor surfaces 5 a of the filter plate 5. As shown in the figure, the filter cloth core 15 is erected so as to face the side surface.
As shown in FIG. 4, the notch window 7c is provided in the part which contact | abuts the support 17 of the bag part 7a of the filter cloth 7, The notch window 7d is provided in the lower bag part 7b.

5 and 6 show details of the attachment portion of the filter cloth 7 to the filter cloth core 15. The upper end portion of the support 17 provided on the front and rear surfaces of the filter cloth core 15 is formed by winding the upper end into a cylindrical shape. When the filter cloth 7 is vibrated, the upper filter cloth rod 12 of the filter cloth 7 that is locked to the support 17 is prevented from coming off by repelling upward.

In order to reinforce the support portion, the filter cloth core 15 may be held between the support plate 25 and the presser plate 26 at the portion where the filter cloth core 15 is supported by the support column 14 and the spring 16. The support 17 may be fixed to the front and rear surfaces of the presser plate 26.

  In this embodiment, an upper filter cloth rod 12 with a filter cloth 7 suspended thereon is locked to a filter cloth core 15 made of a square steel pipe. Since the filter cloth core 15 and the upper filter cloth rod 12 are composed of a rigid member and an elastic member, respectively, if the filter plate 5 is opened after the filtration / dehydration process, the filter cloth 7, the weight 13 and the filter cloth are opened. 7 is applied to the upper filter cloth rod 12 at a stretch, and both ends bend downward with the central column 14 as a fulcrum. The upper filter cloth rod 12 bent downward is repelled upward when reaching the lower solstice point, and by repeating this action, vertical vibration is generated in the filter cloth 7. Further, the vicinity of the center portion of the filter cloth 7 is supported by a support column, and there is a characteristic that the amplitude in the vicinity of both end portions of the filter cloth 7 is large. Therefore, the filter cloth 7 is twisted, and a cake having a thin cake thickness and poor peelability can be easily peeled off from the filter cloth 7.

Since a spring 16 is interposed under the support column 14 through which the filter cloth core 15 is inserted and supported, the amplitude is amplified by resonating with the vibration of the filter cloth core 15 and the upper filter cloth rod 12. A large acceleration is generated during vibration to promote cake peeling.
As an elastic member which comprises the upper filter cloth rod 12, well-known members, such as spring steel and glass fiber, are suitably selected according to a specification.

As shown in FIG. 1, a pair of vibration bars 19 are inserted into and supported by an elevating device 24 erected on a front frame 2 and a rear frame 3 so as to be movable in parallel with the guide rail 4. The elevating device 24 can use a known technique such as a cylinder.
When cake that is difficult to peel remains on the filter cloth 7, the filter cloth 7 can be efficiently vibrated through the upper filter cloth rod 12 by the vibration bar 19, and the filter cloth 7 is regenerated without using cleaning water in particular. be able to.

Specifically, the vibration bar 19 is raised by the cylinder 24 and is provided in the vicinity of the central portion of the vibration bar 19 with the vibration bar 19 coming into contact with both ends of the filter cloth core 15 from below. The vibrating device 20 is vibrated, the filter cloth 7 is forcibly vibrated, and the remaining cake is peeled off.
When the filter plate 5 is opened, the vibration bar 19 is lowered, so that there is no interference when the upper filter cloth rod 12 made of an elastic member is vibrated, and a sufficient amplitude can be secured.
In addition, when the filter plate is closed, the vibration bar 19 is lifted and pushed up while coming into contact with the lower portion of the filter cloth core 15 to align the stock solution passage 22 of the filter plate 5 with the stock solution supply plate 23 of the filter cloth.
Since the filter cloth core 15 is composed of a rigid member, when the filter bar 5 is closed, the vibration bar 19 is lifted and pushed up while coming into contact with the filter cloth core 15 from below. It is easy to align the position of the stock solution passage 22 and the stock solution supply plate 23 of the filter cloth.

When the cake remains on the filter cloth 7, the spring 16 interposed in the column 14 is compressed by the cake load, and the filter cloth 7, the upper filter cloth rod 12, and the filter cloth core 15 are pushed down. . If the filter plate 5 is closed in this state, there are problems such as a pinch failure of the stock solution supply plate 23, component damage due to pinching of the upper filter cloth rod 12, and liquid leakage.
The filter cloth position detection device 21 will be described in detail with reference to FIGS. 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 light projector 21 a is disposed on the front frame 2 of the filter press 1, and a light receiver 21 c that receives the light projection 21 b emitted from the light projector 21 a is disposed on the rear frame 3. The light projection 21b is irradiated in parallel with the guide rail 4 and is received by a light receiver 21c facing each other. In FIG. 9, all the filter cloth cores 15 are raised to the normal position, and the projection light 21 b emitted from the light projector 21 a is incident on the light receiver 21 c. In this state, the cake is surely peeled. In FIG. 10, since there is the filter cloth core 15 that has not been raised to the normal position, the projection light 21b is blocked by the upper filter cloth rod 12 and is not incident on the light receiver 21c. This indicates that the cake is not completely peeled off and an abnormality such as the cake remaining on the filter cloth 7 remains.
In this embodiment, as shown in FIG. 4, the detection is performed by irradiating the projection 21b below the center portion of the filter cloth core 15. However, the filter press type, the number of filter chambers, the field atmosphere, etc. are taken into consideration. The irradiation position and the number of irradiations may be set as appropriate.

6 to 8 show a filter cloth suspending device 30 in a filter press according to another embodiment. An L-shaped support 37 is erected on a filter cloth core 35 made of an elastic member, and a filter cloth 31 is provided. And the upper filter cloth rod 32 made of an elastic member is locked.
Simultaneously with the opening of the filter plate 5, the filter cloth cored bar 35 is simultaneously vibrated together with the upper filter cloth rod 32 by the weight of the cake or the like, and the cake attached to the filter cloth 31 is peeled off.

As shown in FIG. 6, a filter cloth 31 is stretched on the filtration floor surfaces 5 a on the front and back of the filter plate 5, and bag portions 31 a and 31 b are respectively provided at the upper end portion and the lower end portion of the filter cloth 31. An upper filter cloth rod 32 is inserted into the upper bag portion 31a, and a weight 33 for tensioning the filter cloth 31 is inserted into the lower bag portion 31b.

As shown in FIG. 7, a pair of support columns 34, 34 are erected in the central portion above the filter plate 5, and a filter cloth core 35 is slidably inserted through the support columns 34, 34. A spring 36 is interposed on the outer periphery of the lower part of the support 34, and the filter cloth core 35 is supported by the support 34 so as to be swingable. The filter cloth core 35 is sandwiched between the backing plate 38 and the presser plate 39 in the portion where the support cloth 34 and the spring 36 support the filter cloth core 35 to disperse the stress concentration of the support portion. The support 37 may be fixed to the front and rear surfaces of the contact plate 38 or the presser plate 39 of the filter cloth core 35.
Since the filter cloth mandrel 35 is formed of an elastic member, the support 37 can be disposed up to the vicinity of both ends of the filter cloth mandrel 35, and the load applied to the upper filter cloth rod 32 can be dispersed.

As shown in FIG. 8, the support 37 holds the upper filter cloth rod 32 inserted through the bag portion 31 a in a state where the filter cloth 31 is suspended so as to cover the upper and lower filtration floor surfaces 5 a of the filter plate 5. As shown, the filter cloth core 35 is erected so as to face the side surface.
A cutout window 31 c is provided in a portion of the filter cloth 31 that contacts the support 37 of the bag portion 31 a.

If the filter plate 5 is opened after the filtration / dehydration process is completed, the load of the cake attached to the filter cloth 31 and the weight 33 and the filter cloth 31 is applied to the upper filter cloth rod 32 made of an elastic member at a stretch, and the upper filter It hangs on the filter cloth mandrel 35 through the support 37 that locks the cloth rod. Since the filter cloth core 35 is also made of an elastic member, both ends bend downward with the central support column 34 as a fulcrum. The upper filter cloth rod 32 and the filter cloth mandrel 35 bent downward are repelled upward when reaching the lower end point, and by repeating this action, vertical vibrations are generated in the filter cloth 31. Further, the vicinity of the center portion of the filter cloth 31 is supported by a support column, and there is a characteristic that the amplitude in the vicinity of both end portions of the filter cloth 31 is large. Therefore, the filter cloth 31 is twisted, and a cake having a thin cake thickness and poor peelability can be easily peeled from the filter cloth 31.

Since a spring 36 is interposed under the support column 34 through which the filter cloth mandrel 35 is inserted and supported so as to move up and down, the amplitude is amplified by resonating with the vibration of the upper filter cloth rod 32, and the vibration is reduced. In particular, a large acceleration is generated to promote cake peeling.
When cake that is difficult to peel remains on the filter cloth 31, the vibration bar 19 is raised by the cylinder 24, and the vibration bar 19 is in contact with the both ends of the filter cloth core 35 from below. The vibrating device 20 provided in the vicinity of the center is vibrated, the filter cloth 31 is forcibly vibrated, and the remaining cake is peeled off.
As an elastic member constituting the filter cloth mandrel 35, a known member such as spring steel or glass fiber is appropriately selected according to the specification.

The filter cloth suspending device in the filter press of the present invention can peel the filter cloth by vibration due to the weight of the cake adhering to the filter cloth simultaneously with the opening of the filter plate. Moreover, since the number of parts is small and the structure is simple, the parts related to the hanging device can be easily disassembled and assembled.
Therefore, the present invention can be applied to a filter press for treating large-capacity sludge, etc., and a filter cloth suspending device for a multi-chamber type filter press for water sewage sludge, sewage sludge, industrial wastewater sludge, etc. It is.

DESCRIPTION OF SYMBOLS 1 Filter press 5 Filter board 5a Filtration floor surface 6, 30 Lifting device 7, 31 Filter cloth 12, 32 Upper filter cloth rod 14, 34 Strut 15, 35 Filter cloth core 16, 36 Spring 19 Excitation bar 20 Vibration apparatus 21 Filter cloth position detection device

Claims (5)

The upper filter cloth rod (12, 32) with the filter cloth (7, 31) hung on the upper part of the filter plate (5) that can be opened and closed in parallel is suspended by the filter cloth core (15, 35). In the filter press (1) in which the apparatus (6, 30) is arranged and the filter cloth (7, 31) is stretched between the filtration floor surfaces (5a) on the front and back of the filter plate (5), the filter plate (5) A strut (14, 34) is erected in the upper center portion, and the filter cloth core (15, 35) is inserted into and supported by the strut (14, 34), and in the vicinity of the strut of the filter cloth core (15, 35). An apparatus for suspending a filter cloth in a filter press, wherein the upper filter cloth rod (12, 32) is locked and the upper filter cloth rod (12, 32) is formed of an elastic member. The filter cloth mandrel (15, 35) is slidably inserted into the column (14, 34), and a spring (16, 36) is interposed on the lower outer periphery of the column (14, 34). 36. The filter cloth suspending device in the filter press according to claim 1, wherein the filter cloth mandrel (15, 35) is swingably supported by 36). A vibrating bar (19) is bridged up and down along the filter plate (5) row below both ends of the filter cloth core (15, 35), and a vibrating device (20) is mounted on the vibrating bar (19). The filter cloth suspending device in the filter press according to claim 1, wherein the filter cloth is suspended. The filter cloth position detection device (21) for detecting the descending position of the filter cloth mandrel (15, 35) when the filter plate (5) is opened is provided. A filter cloth hanging device in a filter press. The said filter cloth core metal (35) was comprised with the elastic member, The hanging apparatus of the filter cloth in the filter press of any one of Claim 1 thru | or 4 characterized by the above-mentioned.