Device for cleaning liquid medium with vacuum belt filters

Abstract

Device for cleaning liquid medium (2) with vacuum belt filters, wherein - the device has a container (1) for receiving the medium (2) to be cleaned, assemblies (3) with filter belts (10) as vacuum belt filters and at least one vacuum pump (4) for generating a vacuum, - the assemblies (3) each have rollers (11) arranged in a row and spaced apart from one another for carrying the filter belt (10) between supports (12), so that the respective circulating filter belt (10) and the associated supports (12) define a space, - the assemblies (3) are arranged parallel or predominantly parallel and diagonally spaced from one another, - the rollers (11) arranged towards the bottom of the container (1) are hollow cylinders with openings in their walls as first deflection rollers and - the interiors of the first deflection rollers are connected to the vacuum pump (4) as hollow cylinders, characterized in that - that the assemblies (3) protrude above the surface of the medium (2) to be cleaned in the container (1), - that the rollers (11) pointing in the direction away from the medium (2) to be cleaned and arranged above the surface of the medium (2) to be cleaned are coupled as second deflection rollers to drives (16) as components of the assemblies (3), wherein the second deflection rollers and the drives (16) are arranged above the surface of the medium (2) to be cleaned, - that the deflection rollers are connected to each other via chain drives with articulated chains (15), - that the filter belts (10) of the assemblies (3) are detachably connected to the link chains (15), - that channels (20) are arranged at a distance from the ends of the first deflection rollers in the medium (2) to be cleaned, wherein legs of adjacent channels (20) are connected to one another via plates (21) arranged at a distance from the assemblies (3), - that scraper plates (22) are connected to the link chains (15) and - that the scraper plates (22) are designed such that the scraper plates (22) can be guided through the spaces between the first deflection rollers with the areas of the filter belts (10) arranged thereon and the channels (20) as well as between the plates (21) and the areas of the assemblies (3) arranged at a distance therefrom.

Description

[0001] The invention relates to a device for cleaning liquid medium with vacuum belt filters, wherein - the device has a container for holding the medium, assemblies with filter belts as vacuum belt filters and at least one vacuum pump for generating a vacuum, - the assemblies each have rollers arranged in a row and spaced from each other for carrying the filter belt between supports, so that the respective circulating filter belt and the associated supports define a space, - the assemblies are arranged parallel or predominantly parallel and diagonally spaced from each other and - the first rollers arranged towards the bottom of the container as deflection rollers and hollow cylinders have at least partially openings in their walls and are connected with their interior spaces to the vacuum pump.

[0002] In a vacuum belt filter, also known as a vacuum filter, a vacuum pump creates a vacuum in a filter chamber, causing the liquid to be cleaned to flow through the filter belt, leaving contaminants on the belt. The cleaned liquid is pumped out using a conveyor system.

[0003] DE 32 48 231 A1 discloses a vacuum filter system equipped with an endless conveyor belt. The conveyor belt is reinforced with tensile fabric inserts and provided with at least one longitudinal row of holes.

[0004] From the publication DE 20 2018 001 403 U1, a vacuum belt filter for cleaning liquid medium is known, wherein the vacuum belt filter has a container, an endless filter belt and at least one vacuum pump for generating a vacuum. For this purpose, the container for receiving the medium has the guided filter belt bridging the cross-section of the container, wherein the filter belt is guided on a series of rollers arranged at a distance from one another in the container for receiving the medium. Between the filter belt guided on the rollers there is a cavity for the cleaned medium, which is connected via a vacuum container receiving the cleaned medium in conjunction with the vacuum pump and a device conveying the cleaned medium. Furthermore, a unit extending the series of rollers with further rollers guiding the filter belt cuts through the surface of the medium to be cleaned in the container.The vacuum belt filter has a filter belt that is meandering in the container.

[0005] The document DE 10 2019 003 210 A1 discloses a device for cleaning liquid medium using vacuum belt filters. The device comprises a container for holding the medium, filter belts, and at least one vacuum pump for generating a vacuum. For this purpose, the container contains several supports, each with a filter belt. The supports each have rollers arranged in a row and spaced apart from one another for supporting the filter belt between rails, so that the respective circulating filter belt and the associated rails define a space. The filter belts are arranged parallel or predominantly parallel and spaced apart from one another in the container.The rollers arranged towards the bottom of the container as deflection rollers and hollow cylinders have openings in their walls at least in some areas and are connected to their interiors via a vacuum container containing the cleaned medium in conjunction with a vacuum pump and a device for conveying the cleaned medium. Furthermore, at least one of the supports, with the filter belt, cuts through the surface of the medium to be cleaned in the container. The filter belt has several layers, with a first layer being a belt-shaped support element with holes and at least a second layer being a filter fabric. The belt-shaped support element has toothed belts. The feed forces are introduced via the toothed belts, resulting in considerable loads for the filter belts.

[0006] The invention defined in claim 1 is based on the object of easily cleaning liquid medium for further use or application.

[0007] This problem is solved by the features listed in claim 1.

[0008] The device for cleaning liquid medium with vacuum belt filters, whereby - the device has a container for holding the medium to be cleaned, assemblies with filter belts as vacuum belt filters and at least one vacuum pump for generating a vacuum, - the assemblies each have rollers arranged in a row and spaced from each other for carrying the filter belt between supports, so that the respective circulating filter belt and the associated supports define a space, - the assemblies are arranged parallel or predominantly parallel and diagonally spaced from each other, - the rollers arranged towards the bottom of the container as first deflection rollers are hollow cylinders with openings in their walls and - the interiors of the first deflection rollers are connected to the vacuum pump as hollow cylinders, is particularly characterized by the fact that liquid medium is easy to clean for further use or application.

[0009] For this purpose, the assemblies project above the surface of the medium to be cleaned in the container, so that one end region of the assemblies project above the surface of the medium to be cleaned in the container and the other end region of the assemblies are arranged in the medium to be cleaned. The rollers, which point away from the medium to be cleaned and are arranged above the surface of the medium to be cleaned, serve as second deflection rollers and are each coupled to drives as components of the assemblies, with the second deflection rollers and the drives being arranged above the surface of the medium to be cleaned. The deflection rollers are connected to one another via chain drives with articulated chains, with the filter belts of the assemblies being detachably connected to the articulated chains. Channels are arranged at a distance from the ends of the first deflection rollers in the medium to be cleaned, with legs of adjacent channels being connected to one another via plates arranged at a distance from the assemblies.Furthermore, scraper plates are connected to the articulated chains, wherein the scraper plates are designed such that the scraper plates can be guided through the spaces between the first deflection rollers with the areas of the filter belts and the channels arranged thereon, as well as between the plates and the areas of the assemblies arranged at a distance therefrom.

[0010] The assemblies with the filter belts are advantageously arranged at an angle so that the upstream filter belt ends above the downstream one. This arrangement ensures that solids from the filter cake reach the downstream filter belt. The solids from the filter cake can be easily removed from the end of the row of consecutively arranged filter belts. Assemblies can be arranged inside the container or extend above it. At least the last filter belt ends outside the container so that the solids are easily transported out of the container. In the simplest case, the solids can simply fall off the last filter belt. In the spaces of the assemblies between the filter belts, a negative pressure is created via the openings in the deflection rollers, so that the medium to be cleaned is sucked through the filter belts.By means of the assemblies with the filter belts, a large filter surface can be realized for cleaning the liquid medium in the container.

[0011] The channels arranged at a distance from the ends of the first deflection rollers in the medium to be cleaned and the plates connecting the legs of adjacent channels can also be formed in one piece as a plate shaped in this way.

[0012] The deflection rollers are connected to each other via chain drives with articulated chains. For this purpose, at least the second deflection rollers have sprockets. The articulated chains are guided over the first deflection rollers. In one embodiment, the first deflection rollers can also have sprockets for the articulated chains.

[0013] The filter belts are detachably connected to the articulated chains. The filter belts are thus advantageously located between the driven articulated chains, so that the drive and synchronization of the filter belts is carried out by the articulated chains. The feed forces are introduced into the filter belts at several points via fastening elements on the articulated chains, resulting in low loads on the filter belts. The loads are determined by the number and thus the spacing of the fastening elements on the filter belts. Scraper plates are also located on the articulated chains, so that the assemblies each represent a combination of belt filter and container with scraper conveyor.

[0014] The filter belts are advantageously detachably connected to the link chains. In particular, the ends of the filter belts are detachably connected to each other. The end areas of the assemblies, and thus the filter belts, extend above the medium in the tank. Furthermore, the filter belts are individually driven. This allows filter belts to be changed individually while the filtering of the medium is running. The filtering process of the medium therefore does not need to be interrupted to change filter belts.

[0015] The device can thus be used particularly advantageously for cleaning liquid processing media. Such processing operations can include, among other things, machining, forming, or testing of objects. Of course, a liquid medium itself can also be cleaned.

[0016] Advantageous refinements of the invention are presented in the following developments and embodiments. These can further develop the device for cleaning liquid medium with vacuum belt filters individually or in combination.

[0017] In a further development, the link chains can in particular be roller chains.

[0018] In one embodiment, the roller chains can be detachably connected to the filter belts via plates, wherein the plates are connected to pins of the roller chains. The plates can, in particular, be finger-shaped and thus connected to the filter belts. For this purpose, the plate is advantageously connected to the pin of the articulated chain. The plate can be flat or U-shaped in cross-section.

[0019] The detachable connections between the filter belts and the roller chains are clamp and / or screw connections.

[0020] In one embodiment, the rollers of the roller chains can be rollers guided on rails as part of the carrier. The rails can be simple plates on which the rollers can roll.

[0021] The scraper plates can be smooth or serrated. Scraper plates with serrated edges are particularly advantageous for cleaning the processing medium used in steel processing, where a floating carpet of steel shavings forms. An alternating arrangement of serrated and smooth scraper plates transports the resulting carpet of steel shavings out of the container.

[0022] The chutes can be semicircular in a further development, allowing the solids to be removed almost completely. Dead spaces are largely avoided.

[0023] In one embodiment, the interiors of the first deflection rollers are connected to the vacuum pump and a device for conveying the purified medium via a vacuum container containing the purified medium. The purified liquid medium located between the filter belts is pumped out via the vacuum container and the conveying device. Pumping out the purified medium in conjunction with the vacuum pump's negative pressure creates a flow in the container.

[0024] In one embodiment, the vacuum container can contain at least one fill level sensor connected to a control device. The control device is connected to the vacuum pump and the device conveying the purified medium. This enables continuous operation of the vacuum belt filter. At the same time, penetration of the purified medium into the vacuum pump can be prevented.

[0025] In one embodiment, the last assembly can extend laterally beyond both the surface of the medium to be cleaned in the container and the container. At least the last assembly can have a device for removing solid contaminants. A further container can be located beneath the lateral overhang for receiving the contaminants of the medium to be cleaned that fall off from the last assembly and / or by means of the solid removal device.

[0026] An embodiment of the invention is shown in principle in the drawings and is described in more detail below.

[0027] They show: Fig. 1 a device for cleaning liquid medium with vacuum belt filters, Fig. 2 a sectional view of an assembly in a side view, Fig. 3 a roller chain with a filter belt and Fig. 4 end areas of assemblies in a container.

[0028] A device for cleaning liquid medium 2 with vacuum belt filters essentially consists of a container 1 with medium 2 to be cleaned, a vacuum pump 4, a vacuum container 5, a device 6 conveying cleaned medium 7, a further container 9 for receiving impurities and assemblies 3 with rollers 11, filter belts 10 and drives 16.

[0029] The Fig. 1 shows a device for cleaning liquid medium 2 with vacuum belt filters in a basic representation.

[0030] The assemblies 3 are arranged parallel or predominantly parallel and diagonally spaced from one another. The assemblies 3 are connected via the vacuum container 5 to the device 6 conveying the purified medium 7, so that purified medium 7 is made available for further use. The assemblies 3 intersect and project beyond the surface of the medium 2 to be cleaned in the container 1, with one end of the last assembly 3 located outside the container 1. Below this end, the further container 9 is arranged for receiving filtered-out contaminants. The vacuum container 5 is connected to the vacuum pump 4. Furthermore, it contains at least one fill level sensor, which is connected to a control device, which is further interconnected with the vacuum pump 4 and the device 6 conveying the purified medium.Below the assemblies 3 there is a base 8, which can be the base of the container 1 or an intermediate base 8 in the container 1.

[0031] The Fig. 2 shows a basic sectional view of an assembly 3 in a side view.

[0032] An assembly 3 as a vacuum belt filter has the filter belt 10 on the rollers 11 arranged in a row and spaced from one another between supports 12, so that the rotating filter belt 10 and the supports 12 define a space. The roller 11 of the row, pointing towards the bottom of the container 1 and arranged in the medium 2 to be cleaned, is the first deflection roller, a hollow cylinder with openings in its wall. The interior of this first deflection roller is connected to the vacuum pump 4. The first deflection roller 11 can also be connected to first sprockets 13. The last roller 11 of the row, arranged outside the medium 2 to be cleaned, is a second deflection roller connected to sprockets or second sprockets 14. A sprocket or second sprocket 14 connected to the second deflection roller is connected to a drive 16.In a first embodiment, the first sprockets 13 and the second sprockets 14 are connected to each other via link chains 15, thus forming the chain transmissions as chain drives. In a second embodiment, the sprockets and the first deflection roller are connected to each other via link chains 15. The link chains 15 are guided over the second deflection roller, thus forming chain transmissions. The link chains 15 are, in particular, roller chains 15.

[0033] The Fig. 3 shows a roller chain 15 with a filter belt 10 in a basic representation.

[0034] Each of the roller chains 15 is detachably connected to the filter belts 10 via plates 17. For this purpose, the plates are connected at a distance from one another by bolts 18 of the roller chains 15. The detachable connections between the filter belts 10 and the roller chains 15 are clamp and / or screw connections. The rollers 19 of the roller chains 15 are rollers 19 guided on rails as components of the supports 12.

[0035] The Fig. 4 shows end areas of assemblies 3 in a container 1 in a schematic representation.

[0036] Two semicircular troughs 20 are arranged in the medium to be cleaned, spaced apart from the ends of the first deflection rollers. Legs of adjacent troughs 20 are connected to one another via plates 21 arranged spaced apart from the assemblies 3. The troughs 20 and the plates 21 form the intermediate floor 8 in the container 1 or are the floor of the container 1. Scraper plates 22 are also connected to the roller chains 15. The scraper plates 22 are designed such that the scraper plates 22 can be guided through the spaces between the first deflection rollers with the areas of the filter belts 10 arranged thereon and the troughs 20, as well as between the plates 21 and the areas of the assemblies 3 arranged at a distance therefrom. The scraper plates 22 are smooth or have serrations.

[0037] In one embodiment, the last assembly 3, which projects laterally above both the surface of the medium 2 to be cleaned in the container 1 and the container 1, can have a device for removing solids. For this purpose, a further container 9 can be located beneath the lateral projection to receive the contaminants of the medium 2 to be cleaned that fall off from the last assembly 3 and / or by means of the contaminant removal device. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 32 48 231 A1

[0003] DE 20 2018 001 403 U1

[0004] DE 10 2019 003 210 A1

[0005]

Claims

[1] Device for cleaning liquid medium (2) with vacuum belt filters, wherein - the device has a container (1) for receiving the medium (2) to be cleaned, assemblies (3) with filter belts (10) as vacuum belt filters and at least one vacuum pump (4) for generating a vacuum, - the assemblies (3) each have rollers (11) arranged in a row and spaced apart from one another for carrying the filter belt (10) between supports (12), so that the respective circulating filter belt (10) and the associated supports (12) define a space, - the assemblies (3) are arranged parallel or predominantly parallel and diagonally spaced from one another, - the rollers (11) arranged towards the bottom of the container (1) are hollow cylinders with openings in their walls as first deflection rollers and - the interiors of the first deflection rollers are connected to the vacuum pump (4) as hollow cylinders, characterized by , - that the assemblies (3) protrude above the surface of the medium (2) to be cleaned in the container (1), - that the rollers (11) pointing in the direction away from the medium (2) to be cleaned and arranged above the surface of the medium (2) to be cleaned are coupled as second deflection rollers to drives (16) as components of the assemblies (3), wherein the second deflection rollers and the drives (16) are arranged above the surface of the medium (2) to be cleaned, - that the deflection rollers are connected to each other via chain drives with articulated chains (15), - that the filter belts (10) of the assemblies (3) are detachably connected to the link chains (15), - that channels (20) are arranged at a distance from the ends of the first deflection rollers in the medium (2) to be cleaned, wherein legs of adjacent channels (20) are connected to one another via plates (21) arranged at a distance from the assemblies (3), - that scraper plates (22) are connected to the link chains (15) and - that the scraper plates (22) are designed such that the scraper plates (22) can be guided through the spaces between the first deflection rollers with the areas of the filter belts (10) arranged thereon and the channels (20) as well as between the plates (21) and the areas of the assemblies (3) arranged at a distance therefrom. [2] Device according to claim 1, characterized by that the link chains (15) are roller chains (15). [3] Device according to at least one of claims 1 and 2, characterized by that the roller chains (15) are detachably connected to the filter belts (10) via plates (17), that the plates (17) are connected to bolts (18) of the roller chains (15). [4] Device according to at least one of claims 1 to 3, characterized bythat the detachable connections between the filter belts (10) and the roller chains (15) are clamp and / or screw connections. [5] Device according to at least one of claims 1 to 4, characterized by that the rollers (19) of the roller chains (15) are rollers (19) guided on rails as components of the carriers (12). [6] Device according to at least one of claims 1 to 5, characterized by that the scraper plates (22) are smooth or that the scraper plates (22) have teeth. [7] Device according to at least one of claims 1 to 6, characterized by that the grooves (20) are semicircular grooves (20). [8] Device according to at least one of claims 1 to 7, characterized by that the interiors of the first deflection rollers are connected via a vacuum container (5) receiving the cleaned medium (7) in conjunction with the vacuum pump (4) and a device (6) conveying the cleaned medium (7). [9] Device according to at least one of claims 1 to 8, characterized by that at least one fill level sensor connected to a control device is located in the vacuum container (5) and that the control device is connected to the vacuum pump (4) and the device (6) conveying the purified medium (7). [10] Device according to at least one of claims 1 to 9, characterized by that the last assembly (3) projects laterally beyond both the surface of the medium (2) to be cleaned in the container (1) and the container (1), that at least the last assembly (3) has a device for removing solids and that a further container (9) for receiving the impurities of the medium (2) to be cleaned which fall off from the last assembly (3) and / or by means of the device for removing solids is located below the lateral projection.

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