Vertical vacuum filter and vacuum filtration method

Abstract

The invention discloses a vertical vacuum filter and a vacuum filtering method, belonging to the field of filtering technology. The vertical vacuum filter comprises a filter cloth, a filter cloth driving roller and a vacuum filtering mechanism, and also comprises an input roller, at least one left-turning roller and at least one right-turning roller. The filter cloth is in an S shape and is wound between adjacent right-turning rollers and left-turning rollers. One end of the S shape bypasses the input roller, the filter cloth driving roller and is connected to the other end of the S shape to form a closed loop structure; the upper filtering area of ​​each right-turning roller forms a front filtering area, and the lower filtering area of ​​each right-turning roller forms a reverse filtering area. The front filtering area and the reverse filtering area both include a support plate, a vacuum pipeline, a feed pipeline, a left baffle and a right baffle. Not only is the structure simple and compact, but also the space in the height direction is fully utilized to reduce the space occupied by the vacuum filter. The front and back sides of the filter cloth are recycled to increase the filtering area of ​​the filter cloth, thereby improving the filtering quality and filtering efficiency of the vacuum filter.

Description

Technical Field

[0001] The invention relates to a vertical vacuum filter and a vacuum filtering method, belonging to the technical field of filtering. Background Art

[0002] The vacuum filter uses vacuum negative pressure as the driving force to achieve solid-liquid separation. Specifically, the filter cloth is used as the filter medium, and the slurry is placed on the filter medium. The gravity and vacuum suction of the slurry are fully utilized to separate the solid and liquid. It is widely used in various industries such as mining, chemical industry, medicine, and energy.

[0003] Existing vacuum filters are generally installed horizontally. In order to meet the requirements of filtration volume and filtration efficiency, the existing horizontal belt vacuum filters are relatively long, bulky, and occupy a large area.

[0004] In addition, the filter cloth of the existing vacuum filter always keeps using the same filter surface. On the one hand, the other side of the filter cloth is not fully utilized, and on the other hand, the filter cloth needs to be frequently washed to meet the filtering requirements because one side is always used. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a vertical vacuum filter and a vacuum filtration method which have a simple structure, a small volume, and a small footprint, and fully utilizes the front and back surfaces of the filter cloth to filter the slurry, thereby improving not only the filtration quality but also the filtration efficiency.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: a vertical vacuum filter, comprising a filter cloth arranged on a frame, a filter cloth driving roller for driving the filter cloth to circulate and a vacuum filtering mechanism, the vacuum filtering mechanism comprising a vacuum pump and a vacuum pipeline, and also comprising an input roller arranged on the frame, at least one left-turning roller and at least one right-turning roller, the left-turning roller and the right-turning roller being arranged on the left side and the right side of the frame respectively, the filter cloth is wound in an S shape between the adjacent right-turning roller and the left-turning roller, one end of the S shape bypasses the input roller, the filter cloth driving roller and is connected to the other end of the S shape to form a closed loop structure;

[0007] The upper filtering area of ​​each right-turning roller forms a front filtering area, and the lower filtering area of ​​each right-turning roller forms a reverse filtering area. The front filtering area and the reverse filtering area both include a support plate arranged under each layer of the filter cloth, a vacuum pipeline for vacuuming arranged on or under the support plate, a feed pipeline arranged above the filter cloth, a left baffle and a right baffle. The left baffle and the right baffle are rotatably arranged on the frame on the left and rear sides of the corresponding filtering area through a plate opening and closing mechanism.

[0008] The beneficial effects of the present invention are as follows: a vertical multi-layer layout structure can be formed by the cooperation of a plurality of left-turning rollers and right-turning rollers, which changes the horizontal layout of the traditional vacuum filter. Not only is the structure simple and compact, but the filtering areas are arranged in layers in the height direction, which fully utilizes the space in the height direction and reduces the floor space of the vacuum filter. Moreover, the filtering capacity and operating cost have made great breakthroughs. In addition, not only the front side of the filter cloth is used for filtering, but also the back side of the filter cloth is used for filtering. The front and back sides of the filter cloth are recycled, which not only achieves the purpose of fully utilizing the filter cloth, but also increases the filtering area of ​​the filter cloth, thereby improving the filtering quality and filtering efficiency of the vacuum filter. In addition, the alternating use of the front and back sides of the filter cloth can improve the permeability of the filter cloth, further improve the filtering efficiency or reduce the energy consumption of vacuuming.

[0009] Based on the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the plate opening and closing mechanism includes a driving cylinder arranged on the frame, the left baffle or the right baffle is connected to the frame via a hinge shaft, the piston rod of the driving cylinder is hinged to the middle part or free end of the left baffle or the right baffle, or the piston rod of the driving cylinder is hinged to the middle part or free end of the left baffle or the right baffle via a connecting rod.

[0011] The beneficial effect of adopting the above-mentioned further scheme is that the plate opening and closing mechanism adopts an independent drive, that is, the left baffle plate or the right baffle plate on each filter area is respectively equipped with an independent driving cylinder for driving. When the slurry in each filter area starts to be spread, the left baffle plate and the right baffle plate on the left and right sides of the filter cloth need to be lowered to achieve the limit on the left and right sides of the slurry sprinkled on the filter cloth in each filter area.

[0012] Furthermore, the plate opening and closing mechanism includes a driving cylinder and a connecting rod mechanism for driving the left baffle or the right baffle to rotate, the connecting rod mechanism includes a main push rod and branch push rods with the same number of filter areas, the main push rod is movably arranged on the frame up and down, one end of the branch push rod is hinged to the left baffle or the right baffle on each filter area, and the other end is hinged to the main push rod, and the piston rod of the driving cylinder is connected to the main push rod.

[0013] The beneficial effect of adopting the above-mentioned further scheme is that another form of the plate opening and closing mechanism is to use one group of plate opening and closing mechanisms or two groups of plate opening and closing mechanisms to synchronously drive the left baffle of each layer of the filter area, and to use one group of plate opening and closing mechanisms or two groups of plate opening and closing mechanisms to synchronously drive the right baffle of each layer of the filter area, further simplifying the baffle driving structure and reducing costs. The specific power transmission is to transmit the telescopic action of the drive cylinder through the connecting rod mechanism through the main push rod and the branch push rod to the support shaft of each baffle, so that the baffle can be rotated at a hinged fulcrum to lower the baffle or lift it up to facilitate discharge.

[0014] Furthermore, the front filter area and the back filter area both include a washing water pipe, and the washing water pipe is arranged above the filter cloth.

[0015] The beneficial effect of adopting the above further scheme is that whether to set up a washing water pipe or whether to open the washing water pipe can be selected according to user needs. Some materials need to be washed, and the washing water pipe can be opened to wash the materials to meet customer needs; according to customer needs, washing can be performed after filtering, filtering can be performed after washing stops, or filtering can be performed while washing, and the materials after filtration enter the unloading process.

[0016] Furthermore, it also includes a cleaning box, in which a guide roller for the filter cloth to move is provided, and a filter cloth cleaning pipe acting on the front and / or back side of the filter cloth is also provided in the cleaning box.

[0017] The beneficial effect of adopting the above further scheme is that the filter cloth passes over the guide roller in the cleaning box and is cleaned by the cleaning box; the filter cloth can also be pre-cleaned through a filter cloth cleaning pipe between the guide rollers when the filter cloth enters the cleaning box. The filter cloth cleaning pipe can be arranged on the front side, the back side, or the front side and the back side of the filter cloth. The design of the filter cloth cleaning pipe makes the cleaning effect of the filter cloth better when it enters the cleaning box for cleaning.

[0018] Furthermore, a left scraper plate acting on the left side of the left-turning roller and a right scraper plate acting on the right side of the right-turning roller are provided respectively. The left and right scraper plates are respectively arranged on the frame, and a left discharge hopper and a right discharge hopper are respectively provided under the left scraper plate and the right scraper plate.

[0019] The beneficial effect of adopting the above further scheme is that in order to make the filtered filter material discharge more thoroughly, a scraper plate is added, and the discharged filter material can also be collected centrally through a discharge hopper, which is convenient for subsequent treatment of the filter material.

[0020] Furthermore, the filter cloth driving roller includes a main driving roller and at least one auxiliary driving roller.

[0021] The beneficial effect of adopting the above further solution is that the filter cloth can be driven to circulate by the cooperation of the main driving roller and the auxiliary driving roller, and the driving is more stable.

[0022] Furthermore, the support plate includes a water-permeable bottom plate and a grille plate arranged on the bottom plate.

[0023] The beneficial effect of adopting the above further solution is that, on the one hand, it plays a role in supporting the filter cloth during vacuuming, and on the other hand, the cooperation of the water-permeable bottom plate and the grid plate facilitates vacuuming to absorb the moisture in the slurry.

[0024] Furthermore, it also includes a deviation correction mechanism, which includes a position switch for detecting the positions of the two sides of the filter cloth and a deviation correction roller, and the filter cloth passes around the deviation correction roller.

[0025] The beneficial effect of adopting the above further scheme is that after the position switch on one side senses the deviation of the filter cloth, it will transmit the sensing signal on that side to the control system, and the control system will control the movement of the correction roller to correct the deviation. For example, the correction cylinder used to drive one end of the correction roller to extend and retract can be used to control the corresponding end of the correction roller to move upward or downward for correction.

[0026] Furthermore, it also includes a tensioning roller and / or a redirecting roller, and the filter cloth bypasses the tensioning roller and the redirecting roller.

[0027] The beneficial effect of adopting the above further solution is that the filter cloth can be tightened or redirected, which is conducive to tightening and changing the filter cloth, thereby achieving smooth movement of the filter cloth.

[0028] Furthermore, the frame includes a base and side panels arranged on the front and rear sides of the base.

[0029] The beneficial effect of adopting the above further scheme is that the base can raise the frame, which is convenient for placing the discharge hopper to collect the filtered materials. The design of the front and rear side panels is convenient for the installation and positioning of various components such as the support plate, feed pipeline, and vacuum pipeline.

[0030] Furthermore, the invention also comprises an encoder for controlling the running length of the filter cloth.

[0031] The beneficial effect of adopting the above further solution is that the running length of the filter cloth can be controlled by the encoder to determine whether the material has run to the specified position. For example, the encoder can be used to determine whether the unloading is completed, so as to achieve more accurate and efficient vacuum filtration of the slurry.

[0032] The present invention also relates to a vacuum filtration method, comprising the vertical vacuum filter as described above, and the specific steps are as follows:

[0033] S1, the filter cloth stops moving, the plate opening and closing mechanism starts, and the left baffle and the right baffle rotate to close the left and right sides of the front filter area or the back filter area respectively;

[0034] S2, the slurry enters the filter cloth in the front filter area or the back filter area through the feed pipeline for spreading;

[0035] S3, after the slurry between the left baffle and the right baffle has completed filtering the cloth on the filter cloth, the vacuum pump is started, the slurry is filtered through the filter cloth, and the moisture is sucked away by the vacuum pump through the support plate until the slurry filtering is completed;

[0036] S4. Turn off the vacuum pump, the plate opening and closing mechanism starts to operate, the left and right baffles are opened, the filter cloth driving roller starts to operate, the filter cloth starts to move and unload, after the unloading is completed, the filter cloth stops moving and enters the next cycle.

[0037] The beneficial effects of the present invention are: a vertical multi-layer filter area structure is formed by setting adjacent front filter areas and back filter areas, and the front and back sides of the filter cloth are used to filter the slurry in the corresponding filter area at the same time. The front and back sides of the filter cloth are recycled, which not only achieves the purpose of fully utilizing the filter cloth, but also increases the filter area of ​​the filter cloth, and improves the filter quality and filter efficiency of the vacuum filter. The horizontal layout of the traditional vacuum filter is changed, which is not only simple and compact in structure, but also fully utilizes the space in the height direction, reduces the space occupied by the vacuum filter, and has a great breakthrough in filtering capacity and operating costs.

[0038] Based on the above technical solution, the present invention can also be improved as follows.

[0039] Furthermore, in the above step S3, before or during filtration, the washing water pipe located above the filter cloth is opened to wash the material on the filter cloth.

[0040] The beneficial effect of adopting the above further scheme is that whether to set up a washing water pipe or open the washing water pipe can be selected according to user needs. Some materials need to be washed according to customer requirements, and the washing water pipe can be opened to wash the materials to meet customer needs; according to customer needs, washing can be performed after filtration, and filtering can be performed after washing stops, or filtering can be performed while washing, and the materials after filtration enter the unloading, thereby meeting different filtration requirements of customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of the vacuum filter of the present invention;

[0042] Figure 2 It is a side structural schematic diagram of the vacuum filter of the present invention;

[0043] Figure 3 This is a schematic diagram of the driving structure of the right baffle of Example 1 of the present invention;

[0044] Figure 4 It is a structural schematic diagram of the deviation correction roller of the present invention;

[0045] Figure 5 It is a structural schematic diagram of the left discharge hopper of the present invention;

[0046] Figure 6 This is a structural schematic diagram of the driving method of the right baffle of Example 2 of the present invention;

[0047] In the figure, 1. cleaning box; 2. filter cloth cleaning pipe; 3. right discharge hopper; 4. main driving roller; 5. tensioning roller; 6. filter cloth; 7. encoder; 8. feed pipeline; 9. vacuum pipeline; 10. bottom plate; 11. grid plate; 12. right turning roller; 13. right scraper plate; 14. right baffle plate; 15. washing water pipe; 16. side plate; 17. base; 18. deviation correction roller; 19. redirection roller; 20. driving cylinder; 21. main push rod; 22. left turning roller; 23. left scraper plate; 24. left baffle plate; 25. left discharge hopper; 26. input roller; 27. branch push rod; 28. deviation correction cylinder; 29. ​​filter cloth hole. DETAILED DESCRIPTION

[0048] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0049] Embodiment 1, as Figure 1-Figure 5 As shown, a vertical vacuum filter comprises a filter cloth 6 arranged on a frame, a filter cloth driving roller for driving the filter cloth 6 to circulate, and a vacuum filtering mechanism, wherein the vacuum filtering mechanism comprises a vacuum pump and a vacuum pipeline 9, and further comprises an input roller 26 arranged on the frame, at least one left-turning roller 22, and at least one right-turning roller 12, wherein the left-turning roller 22 and the right-turning roller 12 are respectively arranged on the left side and the right side of the frame, and the filter cloth 6 is wound in an S shape between the adjacent right-turning roller 12 and the left-turning roller 22, wherein one end of the S shape bypasses the input roller 26, and the filter cloth driving roller is connected to the other end of the S shape to form a closed loop structure;

[0050] The upper filtering area of ​​each right-turning roller 12 forms a front filtering area, and the lower filtering area of ​​each right-turning roller 12 forms a reverse filtering area. The front filtering area and the reverse filtering area both include a support plate arranged below each layer of the filter cloth 6, a vacuum pipeline 9 for vacuuming arranged on or below the support plate, a feed pipeline 8 arranged above the filter cloth 6, a left baffle 24 and a right baffle 14. The left baffle 24 and the right baffle 14 are rotatably arranged on the frame on the left and rear sides of the front filtering area or the reverse filtering area through a plate opening and closing mechanism.

[0051] The plate opening and closing mechanism comprises a driving cylinder 20 and a connecting rod mechanism for driving the left baffle or the right baffle to rotate, the connecting rod mechanism comprises a main push rod 21 and a branch push rod 27 with the same number of filtering zones, the main push rod is arranged on the frame to be movable up and down, one end of the branch push rod is hinged with the left baffle or the right baffle on each filtering zone, and the other end is hinged with the main push rod, and the piston rod of the driving cylinder is connected with the main push rod. The main push rod is arranged on the frame to be movable up and down. Another form of the plate opening and closing mechanism is to use a set of plate opening and closing mechanisms or two sets of plate opening and closing mechanisms to synchronously drive the left baffle of each layer of filtering zone, and to use a set of plate opening and closing mechanisms or two sets of plate opening and closing mechanisms to synchronously drive the right baffle of each layer of filtering zone, one set of plate opening and closing mechanisms uses a driving cylinder to drive the branch push rod through the main push rod to drive the baffle to rotate, lower, close or lift to open, and when two sets of plate opening and closing mechanisms are used, two driving cylinders are used to drive the shafts at the left and right ends of the baffle respectively. The baffle driving structure is further simplified and the cost is reduced. The specific power transmission is that the telescopic action of the driving cylinder is transmitted to the supporting shaft of each baffle through the connecting rod mechanism through the main push rod and the branch push rod, so that the baffle can be rotated at the hinge fulcrum to lower the baffle or lift it up to facilitate unloading.

[0052] The front filtering area and the back filtering area both include a washing water pipe 15, and the washing water pipe 15 is arranged above the filter cloth 6. Whether to set the washing water pipe or open the washing water pipe is selected according to user needs. Some materials need to be washed, and the washing water pipe can be opened to wash the materials to meet customer needs; according to customer needs, washing can be performed after filtering, filtering can be performed after washing stops, or filtering can be performed while washing, and the filtered materials enter the unloading process.

[0053] It also includes a cleaning box 1, in which a guide roller is provided for the filter cloth 6 to travel, and a filter cloth cleaning pipe 2 is provided in the cleaning box 1 to act on the front and / or back of the filter cloth 6. The filter cloth 6 passes over the guide roller in the cleaning box 1, and the filter cloth 6 is cleaned by the cleaning box 1; the filter cloth 6 can also be pre-cleaned through the filter cloth cleaning pipe 2 between the guide rollers when entering the cleaning box 1. The filter cloth cleaning pipe 2 can be arranged on the front side, back side, or both the front side and back side of the filter cloth 6. The design of the filter cloth cleaning pipe 2 makes the cleaning effect of the filter cloth 6 better when it enters the cleaning box 1 for cleaning. There are filter cloth holes 29 on the left discharge hopper 25 for the filter cloth to pass through.

[0054] A left scraper plate 23 acting on the left side of the left-turning roller 22 and a right scraper plate 13 acting on the right side of the right-turning roller 12 are also provided. The left and right scraper plates 13 are respectively arranged on the frame, and a left discharge hopper 25 and a right discharge hopper 3 are respectively arranged below the left scraper plate 23 and the right scraper plate 13. In order to make the filtered material discharge more thoroughly, the scraper plates are added, and the discharged filter material can also be collected centrally through the discharge hopper, which is convenient for subsequent treatment of the filter material.

[0055] The filter cloth driving roller comprises a main driving roller 4 and at least one auxiliary driving roller. The main driving roller 4 and the auxiliary driving roller cooperate to drive the filter cloth 6 to circulate, and the driving is more stable.

[0056] The support plate includes a water-permeable bottom plate 10 and a grid plate 11 arranged on the bottom plate 10. On the one hand, it plays a role in supporting the filter cloth 6 during vacuuming, and on the other hand, the water-permeable bottom plate 10 and the grid plate 11 cooperate to facilitate vacuuming to absorb moisture in the slurry.

[0057] It also includes a deviation correction mechanism, which includes a position switch for detecting the positions of both sides of the filter cloth 6 and a deviation correction roller 18, and the filter cloth 6 passes over the deviation correction roller 18. After the position switch on one side senses the deviation of the filter cloth, it transmits the sensing signal of that side to the control system, and the control system controls the movement of the deviation correction roller to correct the deviation, such as controlling the corresponding end of the deviation correction roller to move upward or downward to correct the deviation by extending and retracting the deviation correction cylinder 28 used to drive one end of the deviation correction roller.

[0058] It also includes a tensioning roller 5 and / or a redirecting roller 19, and the filter cloth 6 bypasses the tensioning roller and the redirecting roller 19. The filter cloth 6 can be tightened or redirected, which is conducive to the tightening and changing of the filter cloth 6, thereby realizing the smooth walking of the filter cloth 6.

[0059] The frame includes a base 17 and side panels 16 arranged on the front and rear sides of the base 17. The base 17 can raise the frame, which is convenient for placing the discharge hopper to collect the filtered materials. The design of the front and rear side panels 16 is convenient for the installation and positioning of various components such as the support plate, the feed pipeline 8, and the vacuum pipeline 9.

[0060] The system also includes an encoder 7 for controlling the running length of the filter cloth 6. The running length of the filter cloth can be controlled by the encoder to determine whether the material has run to a specified position. For example, the encoder 7 can be used to determine whether the unloading is completed, so as to achieve more accurate and efficient vacuum filtration of the slurry.

[0061] Embodiment 2, as Figure 6As shown, the plate opening and closing mechanism includes a drive cylinder 20 arranged on the frame, the left baffle 24 or the right baffle 14 is connected to the frame through a hinge shaft, the piston rod of the drive cylinder 20 is hinged to the middle part or free end of the left baffle 24 or the right baffle 14, or the piston rod of the drive cylinder 20 is hinged to the middle part or free end of the left baffle 24 or the right baffle 14 through a connecting rod. The plate opening and closing mechanism adopts independent drive, that is, the left baffle or the right baffle on each filter area is respectively equipped with an independent drive cylinder for driving. When the slurry in each filter area starts to be spread, the left baffle 24 and the right baffle 14 on the left and right sides of the filter cloth 6 need to be lowered to achieve the limit of the left and right sides of the slurry sprinkled on the filter cloth 6 in each filter area. The remaining structure is the same as that of Example 1, and will not be described in detail here.

[0062] The present invention also relates to a vacuum filtration method, comprising the vertical vacuum filter as described above, and the specific steps are as follows:

[0063] S1, the filter cloth 6 stops moving, the plate opening and closing mechanism starts, and the left baffle 24 and the right baffle 14 rotate to close the left and right sides of the front filter area or the back filter area respectively;

[0064] S2, the slurry enters the filter cloth 6 of the front filter area or the back filter area through the feed pipe 8 for distribution;

[0065] S3, after the slurry between the left baffle plate 24 and the right baffle plate 14 has completed filtering the cloth on the filter cloth 6, the vacuum pump is started, the slurry is filtered through the filter cloth 6, and the moisture is sucked away by the vacuum pump through the support plate until the slurry filtering is completed;

[0066] S4, turn off the vacuum pump, the plate opening and closing mechanism starts, the left and right baffles 14 are opened, the filter cloth driving roller starts, the filter cloth 6 moves and starts to unload, after the unloading is completed, the filter cloth 6 stops moving and enters the next cycle.

[0067] The slurry filtration is completed, and the dehydration of the material on the filter cloth can be observed to determine, for example, reaching a certain moisture content.

[0068] In the above step S3, before or during filtering, the washing water pipe located above the filter cloth is opened to wash the material on the filter cloth. Some materials need to be washed according to customer requirements, and it can be selected whether to set the washing water pipe or open the washing water pipe according to user needs. The materials that need to be washed can be washed by opening the washing water pipe to meet customer needs; according to customer needs, washing can be performed after filtering, and filtering can be performed after washing stops, or filtering can be performed while washing, and the filtered materials enter the discharge, thereby meeting different filtering requirements of customers.

[0069] like Figure 1 As shown in the figure, three right-turning rollers and three left-turning rollers are selected to form three groups of positive filtering areas and reverse filtering areas. Figure 3 The structural schematic diagram of the plate opening and closing mechanism of Example 1 is presented in the figure. A driving cylinder can simultaneously drive the right baffles of multiple layers to rotate synchronously. The support shafts at both ends of the right baffle can be rotatably supported on the frame, specifically, can be rotatably supported on the side plates of the frame. The feed pump can pump the slurry through the feed pipeline 8 to the filter cloth 6 in the filter area of ​​each layer; the feed pump can be closed to stop feeding according to whether the slurry reaches the required thickness; the bottom plate 10 includes a bottom edge and a rib arranged on both sides of the bottom edge, the rib is perpendicular to the bottom edge, or the rib is inclined outward from bottom to top, which can not only support the slurry on the filter cloth 6, but also have a certain material blocking effect, and cooperate with the left and right baffles 14 to block and limit the front, back, left and right sides of the slurry to prevent slurry leakage. The main drive roller 4 and the auxiliary drive roller can be driven by hydraulic motors respectively; the vacuum filtration mechanism can also include a gas-liquid separator, which can play a role in roughly filtering out some moisture in the air.

[0070] When working, close the baffle, and the slurry is sprinkled on the filter cloth between the left and right baffles of the filter section through the feed port of the feed pipeline. When the slurry covers the filter cloth, if the slurry reaches the required thickness, close the feed pump to stop the feed of the feed pipeline, start the vacuum pump, and the slurry is filtered through the filter cloth. The moisture is sucked away by the vacuum pipeline of the filter section through the bottom plate and the grid plate to achieve the purpose of filtration. When the moisture content of the material reaches the required level, close the vacuum pump; open the left and right baffles, start the drive motor of the tensioning roller, and tighten the filter cloth; start the main drive roller and the auxiliary drive roller, and convey the filtered material out through the filter cloth, unload it into the left and right discharge hoppers through the scraper plate, and enter the unloading area for unloading. After the filter cloth operation is completed, stop the filter cloth drive, stop tightening the filter cloth, and enter the next cycle.

[0071] Taking sludge filtering as an example, the filter cloth is about 1.5 meters wide, the filter section is about 3 meters long, the cloth thickness on the filter cloth is about 15-30 mm, the moisture content of the slurry before filtration is about 40%, and the filter section is vacuum filtered. The moisture content of the material after vacuum filtration is about 10%-18%. The filter cloth is running, and the material is discharged with the operation of the filter cloth. The material falls into the discharge hopper, and the above operation is repeated to achieve efficient dehydration. The above-mentioned filtration section filtration takes about 3 minutes, that is to say, it can achieve simultaneous vacuum filtration of slurry in multiple filtration areas in about 3 minutes, thereby meeting the requirements of efficient material dehydration.

[0072] Compared with the prior art, a vertical layout is adopted, and the vacuum is directly connected to the bottom plate 10, the grid plate 11, and the filter cloth, so the vacuuming effect is better; the filter cloth 6 can be used on both sides and has a double-sided cleaning function, with a large filtering area, a high vacuum degree, and a high degree of automation. When the present invention is used, it occupies a small area, has a large output, a simple and compact structure, and a low cost.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vacuum filtration method, comprising a vertical vacuum filter, the vertical vacuum filter comprising a filter cloth (6) arranged on a frame, a filter cloth driving roller for driving the filter cloth (6) to circulate, and a vacuum filtration mechanism, the vacuum filtration mechanism comprising a vacuum pump and a vacuum pipeline (9), characterized in that: It also includes an input roller (26), at least one left-turning roller (22) and at least one right-turning roller (12) arranged on the frame, wherein the left-turning roller (22) and the right-turning roller (12) are arranged on the left side and the right side of the frame respectively; The upper filtering area of ​​each right-turning roller (12) forms a front filtering area, and the lower filtering area of ​​each right-turning roller (12) forms a reverse filtering area; The invention is characterized in that the filter cloth (6) is wound in an S shape between the adjacent right-turning roller (12) and left-turning roller (22), one end of the S shape is wound around the input roller (26), and the filter cloth driving roller is connected to the other end of the S shape to form a closed loop structure, and the front filtering area and the back filtering area both include a support plate arranged below each layer of the filter cloth (6), a vacuum pipeline (9) for vacuuming arranged on or below the support plate, a feed pipeline (8) arranged above the filter cloth (6), a left baffle plate (24) and a right baffle plate (14), and the left baffle plate (24) and the right baffle plate (14) are rotatably arranged on the frame on the left and rear sides of the corresponding filtering area through a plate opening and closing mechanism respectively; the specific steps are as follows: S1, the filter cloth (6) stops moving, the plate opening and closing mechanism is activated, and the left baffle (24) and the right baffle (14) rotate to close the left and right sides of the front filter area or the back filter area respectively; S2, the slurry enters the filter cloth (6) of the front filter area or the back filter area through the feed pipeline (8) for distribution; S3, after the slurry between the left baffle plate (24) and the right baffle plate (14) has completed filtering the cloth on the filter cloth (6), the vacuum pump is started, the slurry is filtered through the filter cloth (6), and the moisture is sucked away by the vacuum pump through the support plate until the slurry filtering is completed; S4, the vacuum pump is turned off, the plate opening and closing mechanism is activated, the left baffle (24) and the right baffle (14) are opened, the filter cloth driving roller is activated, the filter cloth (6) moves to start unloading, and after unloading is completed, the filter cloth (6) stops moving and enters the next cycle; The front filtering area and the back filtering area both further include a washing water pipe (15), and the washing water pipe (15) is arranged above the filter cloth (6); in the above step S3, before or during filtering, the washing water pipe (15) located above the filter cloth (6) is opened to wash the material on the filter cloth (6); It also comprises a cleaning box (1), wherein the cleaning box (1) is provided with a guide roller for the filter cloth (6) to travel, and the cleaning box (1) is also provided with a filter cloth cleaning pipe (2) acting on the front and / or back side of the filter cloth (6); the filter cloth is pre-cleaned between the guide rollers when entering the cleaning box through the filter cloth cleaning pipe, and the filter cloth cleaning pipe is arranged on the front side, the back side, or the front side and the back side of the filter cloth, and the filter cloth cleaning pipe makes the cleaning effect of the filter cloth better when entering the cleaning box for cleaning; A left scraper plate (23) is also provided for acting on the left side of the left-turning roller (22) and a right scraper plate (13) is provided for acting on the right side of the right-turning roller (12). The left scraper plate (23) and the right scraper plate (13) are respectively arranged on the frame. A left discharge hopper (25) and a right discharge hopper (3) are respectively provided below the left scraper plate (23) and the right scraper plate (13). A vertical multi-layer filter area structure is formed by setting up adjacent front filter areas and back filter areas. The front and back sides of the filter cloth are used to filter the slurry in the corresponding filter areas at the same time. The front and back sides of the filter cloth are recycled to make full use of the filter cloth and increase the filter area of ​​the filter cloth.

2. The vacuum filtration method according to claim 1, characterized in that: The plate opening and closing mechanism comprises a driving cylinder (20) and a connecting rod mechanism for driving the left baffle or the right baffle to rotate, the connecting rod mechanism comprises a main push rod (21) and branch push rods (27) whose number is the same as the filtering zones, one end of the branch push rod is hinged to the left baffle or the right baffle on each filtering zone, and the other end is hinged to the main push rod, and the piston rod of the driving cylinder is connected to the main push rod.

3. The vacuum filtration method according to claim 1, characterized in that: The plate opening and closing mechanism comprises a drive cylinder (20) arranged on the frame, the left baffle (24) or the right baffle (14) is connected to the frame via a hinge shaft, the piston rod of the drive cylinder (20) is hinged to the middle part or free end of the left baffle (24) or the right baffle (14), or the piston rod of the drive cylinder (20) is hinged to the middle part or free end of the left baffle (24) or the right baffle (14) via a connecting rod.

4. The vacuum filtration method according to claim 1, characterized in that: The support plate comprises a water-permeable bottom plate (10) and a grid plate (11) arranged on the bottom plate (10).

5. The vacuum filtration method according to claim 1, characterized in that: The invention also comprises an encoder (7) for controlling the running length of the filter cloth (6).

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