Automatic discharge control method for filter press

Abstract

The application discloses an automatic mud unloading control method of a filter press, and comprises the following steps: step S1, when the filter press enters a mud unloading process, a detection system is started, and a scanning end of the detection system acquires an image of a filter plate surface of the filter press and transmits the image to a control end of the detection system; step S2, the control end of the detection system processes the acquired image, obtains information about whether mud cakes on the filter plate surface fall off, and transmits the mud cake information to a filter press control system; and step S3, the filter press control system controls whether an auxiliary mud unloading device operates according to the mud cake information on the filter plate surface. The application has the characteristics of simple principle, convenient operation and high mud unloading efficiency, realizes full-automatic work of the filter press, and does not need manual on-site work.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sludge treatment, in particular to an automatic sludge unloading control method of a filter press. BACKGROUND

[0002] The filter press is a solid-liquid separation device in the sludge treatment industry, which realizes sludge-water separation under the extrusion state of filter cloth and filter plate to reduce the water content of sludge. Some sticky mud cakes will not fall off naturally during the sludge unloading process of the filter press, and need to be manually scooped or assisted by other sludge unloading devices. In recent years, the auxiliary sludge unloading device of the filter press has developed rapidly, and various auxiliary sludge unloading devices have been applied. Although the filter press can be assisted in unloading sludge by using some auxiliary sludge unloading devices, the working efficiency of the filter press is also reduced.

[0003] The automatic sludge unloading device of the filter press does not have a corresponding detection system or method during the sludge unloading process, and the auxiliary sludge unloading device can only uniformly unload each filter plate once. The existing technology has the following defects:

[0004] The filter press has a long sludge unloading time. During actual use, the filter press mud cake has a certain natural falling rate: after the filter plate is pulled open, the mud cake can naturally fall off without the work of the auxiliary sludge unloading device, and the natural falling rate of the mud cake is related to the mud quality and the use time of the filter cloth. Generally, the natural falling rate of the mud cake is between 10% and 99%. If the auxiliary sludge unloading device works once for each filter plate during the sludge unloading process (when the auxiliary sludge unloading device is working, the filter press pauses the plate pulling action or the hook-pulling filter plate device is in a paused state), the overall sludge unloading time of the filter press will be longer.

[0005] The unloading effect cannot be automatically determined, and the batch processing capacity of the filter press is low. At present, although most filter presses are equipped with auxiliary sludge unloading devices, the unloading effect of the auxiliary sludge unloading device is not stable, and is greatly related to the use time of the filter cloth and the mud quality. Generally, the longer the use time of the filter cloth, the worse the filtering performance, the lower the mud cake falling rate, and the lower the filter press unloading rate. The auxiliary sludge unloading device can only work mechanically once for the same filter plate, and there is no method to automatically detect the unloading effect. If the mud cake on the filter plate still does not fall off after the work of the auxiliary sludge unloading device, the mud cake will occupy the space of the filter plate chamber, resulting in a reduction in the processing capacity of the next batch of filter press and a reduction in the production efficiency of the filter press. SUMMARY

[0006] The technical problem to be solved by the present application is to provide an automatic sludge unloading control method of a filter press, which has the advantages of simple principle, convenient operation and high unloading efficiency.

[0007] In order to solve the above technical problems, the technical scheme adopted by the present application is:

[0008] An automatic mud unloading control method of a filter press, comprising the following steps:

[0009] Step S1, after the filter press enters the mud unloading process, the detection system is started, the scanning end of the detection system acquires the image of the filter plate surface and transmits it to the control end of the detection system;

[0010] Step S2, the control end of the detection system processes the acquired image to obtain the information of whether the mud cake on the filter plate surface has fallen off, and transmits the mud cake information to the filter press control system;

[0011] Step S3, the filter press control system controls whether the auxiliary mud unloading device operates according to the mud cake information on the filter plate surface.

[0012] As a further improvement of the present application, in step S1, the scanning end of the detection system walks synchronously with the pull plate equipment that pulls the filter plate of the filter press in the mud unloading process, and moves following the pulled open filter plate, and starts scanning the filter plate after the filter plate is pulled open to acquire the image of the filter plate surface.

[0013] As a further improvement of the present application, the scanning end of the detection system scans the front face, side face and back face of the filter plate to acquire the image information of the filter plate height C, filter plate width D and total thickness b of the filter plate and mud cake, and transmits the image information to the control end of the detection system for processing and modeling to form the 3D image of the filter plate.

[0014] As a further improvement of the present application, the control end of the detection system divides the whole filter plate into N regions according to the 3D image of the filter plate, then the total area S of the whole filter plate = s1+s2+s3+s4+......+ sN; the total thickness of the filter plate and mud cake corresponding to each region is b1, b2, b3, b4,......, b N respectively; then the total average thickness B of the filter plate and mud cake = (b1+b2+b3+b4+......+bN) / N.

[0015] As a further improvement of the present application, the control end of the detection system compares the calculated total average thickness B of the filter plate and mud cake with the designed thickness A of the filter plate, if B≤A, it indicates that the mud cake on the filter plate surface has fallen off, the auxiliary mud unloading device does not work, and the filter press control system controls the pull plate equipment to continue pulling plate to unload mud.

[0016] As a further improvement of the present application, the control end of the detection system compares the calculated total average thickness B of the filter plate and the mud cake with the design thickness A of the filter plate, if B>A, it indicates that the mud cake on the surface of the filter plate has not fallen off, the filter press control system controls the auxiliary mud unloading device to work once, after the auxiliary mud unloading device works once, the detection system scans again to obtain the mud cake information; if the mud cake still does not fall off, the auxiliary mud unloading device works again; if the mud cake falls off, the auxiliary mud unloading device stops working, and the filter press control system controls the plate pulling device to continue to pull the plate and unload the mud.

[0017] As a further improvement of the present application, when the number of times that the auxiliary mud unloading device works on the same filter plate reaches the preset number of times, whether the mud cake falls off or not, the plate pulling device continues to pull the plate and unload the mud, and the filter press control system alarms and records.

[0018] As a further improvement of the present application, the filter press control system adopts a PLC control system.

[0019] As a further improvement of the present application, the scanning end of the detection system adopts a camera or an array camera or a combination of a camera and an infrared detector.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] The filter press automatic mud unloading control method of the present application can identify whether there is a mud cake on the filter plate of the filter press through the detection system, when the filter press control system receives the information that there is no mud cake on the filter plate, the filter press control system controls the auxiliary mud unloading device to directly skip the auxiliary mud unloading step and continue the plate pulling and mud unloading step, effectively saving the mud unloading time and improving the mud unloading efficiency of the filter press. If the detection system identifies that the mud cake on the filter plate does not fall off during the mud unloading process, the filter press control system can control the auxiliary mud unloading device to work again, so that the mud cake falls off from the filter plate, significantly improving the mud unloading rate of the filter press. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a flowchart of the filter press automatic mud unloading control in the embodiment of the present application;

[0023] Figure 2 It is a schematic diagram of the control system composition in the embodiment of the present application;

[0024] Figure 3 It is a working principle diagram of the detection system in the embodiment of the present application;

[0025] Figure 4 It is a front view of the filter plate of the filter press in the embodiment of the present application;

[0026] Figure 5 It is a side view of the filter plate of the filter press in the embodiment of the present application.

[0027] Illustrations: 1. Front of filter plate; 2. Side of filter plate; 3. Back of filter plate; 4. Center hole of filter plate; 5. Filtration hole. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more unless otherwise explicitly specified.

[0031] Example

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, the automatic sludge unloading control method for a filter press of the present invention includes the following steps:

[0033] Step S1: When the filter press enters the sludge unloading process, the detection system is started. The scanning end of the detection system acquires the image of the filter plate surface of the filter press and transmits it to the control end of the detection system.

[0034] Step S2: The CPU control terminal of the detection system processes the acquired image to obtain information on whether the mud cake on the surface of the filter plate has fallen off, and transmits the mud cake information to the filter press control system.

[0035] Step S3: The filter press control system controls whether the auxiliary unloading device operates based on the information of the mud cake on the filter plate surface. By linking the detection system with the filter press control system, the start and stop of the auxiliary unloading device are precisely controlled, improving the mud cake drop rate, thereby improving the unloading efficiency and production efficiency of the filter press.

[0036] In this embodiment, the filter press control system adopts a PLC control system, which has the characteristics of simple principle, convenient operation and precise control. The scanning end of the detection system can use a camera or an array camera or a combination of a camera and an infrared detector, etc. image forming equipment to realize accurate acquisition of the key parameters of the filter plate surface.

[0037] In this embodiment, the detection system can identify whether there is a mud cake on the filter plate of the filter press. When the filter press control system receives information that there is no mud cake on the filter plate, the filter press control system controls the auxiliary mud unloading device to directly skip the auxiliary mud unloading step and continue the plate pulling and mud unloading step, effectively saving the mud unloading time and improving the mud unloading efficiency of the filter press. If the detection system identifies that the mud cake on the filter plate has not fallen off during the mud unloading process, the filter press control system can control the auxiliary mud unloading device to work again, so that the mud cake falls off from the filter plate, significantly improving the mud unloading rate of the filter press.

[0038] In step S1 of this embodiment, the scanning end of the detection system walks synchronously with the plate pulling equipment of the filter press during the mud unloading process, and moves with the pulled open filter plate. The scanning of the filter plate starts at the moment when the filter plate is pulled open, and the image of the filter plate surface is acquired.

[0039] As shown in Figure 4 and Figure 5 , the filter plate center is provided with a filter plate center hole 4, and the filter plate periphery is provided with a filter liquid hole 5. The scanning end of the detection system scans the front face 1 of the filter plate, the side face 2 of the filter plate and the back face 3 of the filter plate to acquire key image parameter information such as the height C of the filter plate, the width D of the filter plate, the total thickness b of the filter plate and the mud cake, and transmit the image information to the control end of the detection system for processing and modeling to form a 3D image of the filter plate.

[0040] The control end of the detection system divides the entire filter plate into N regions according to the 3D image of the filter plate, so the total area S of the entire filter plate is s1+s2+s3+s4+......+sN; the total thickness of the filter plate and the mud cake corresponding to each region is b1, b2, b3, b4,......, bN; and the total average thickness B of the filter plate and the mud cake is (b1+b2+b3+b4+......+bN) / N.

[0041] The control end of the detection system compares the calculated total average thickness B of the filter plate and the mud cake with the design thickness A of the filter plate. If B≤A, it indicates that the mud cake on the surface of the filter plate has fallen off. The control end of the detection system sends corresponding instructions to the filter press control system, the auxiliary mud unloading device does not work, and the filter press control system controls the plate pulling equipment to continue the plate pulling and mud unloading.

[0042] If B > A, it indicates that the mud cake on the surface of the filter plate has not fallen off, the control end of the detection system sends corresponding instructions to the filter press control system, the filter press control system controls the auxiliary mud unloading device to work once, after the auxiliary mud unloading device works once, the detection system scans and acquires mud cake information again; if the mud cake still does not fall off, the auxiliary mud unloading device works again; if the mud cake falls off, the auxiliary mud unloading device stops working, and the filter press control system controls the plate pulling equipment to continue to pull the plate and unload the mud.

[0043] When the number of times that the auxiliary mud unloading device works on the same filter plate reaches a preset number of times, for example, twice, the specific number of repetitions can be set according to the actual sludge quality. After the auxiliary mud unloading device works twice, whether the mud cake falls off or not, the plate pulling equipment continues to pull the plate and unload the mud, and the filter press control system alarms and records.

[0044] In other embodiments, the design thickness A of the filter plate, the number N of regions divided by the filter plate and other parameters can be adjusted according to the actual situation on site.

[0045] The above only describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments only, any technical solution that belongs to the idea of the present application falls within the protection scope of the present application. It should be noted that for ordinary skilled persons in the art, some improvements and decorations without departing from the principles of the present application are also considered to be within the protection scope of the present application.

Claims

1. A method for automatic discharge control of a filter press, characterized by, Includes the following steps: Step S1: When the filter press enters the sludge unloading process, the detection system is started. The scanning end of the detection system acquires the image of the filter plate surface of the filter press and transmits it to the control end of the detection system. Step S2: The control terminal of the detection system processes the acquired image to obtain information on whether the mud cake on the surface of the filter plate has fallen off, and transmits the mud cake information to the filter press control system. Step S3: The filter press control system controls whether the auxiliary sludge unloading device operates based on the sludge cake information on the filter plate surface. The scanning end of the detection system scans the front (1), side (2) and back (3) of the filter plate to obtain image information of the filter plate height C, filter plate width D and the total thickness b of the filter plate and the mud cake, and transmits the image information to the control end of the detection system for processing and modeling to form a 3D image of the filter plate. The control terminal of the detection system divides the entire filter plate into N regions based on the 3D image of the filter plate. The total area of ​​the entire filter plate is S = s1 + s2 + s3 + s4 + ... + sN. The total thickness of the filter plate and the mud cake corresponding to each region are b1, b2, b3, b4, ..., bN, respectively. The total average thickness of the filter plate and the mud cake is B = (b1 + b2 + b3 + b4 + ... + bN) / N. The control end of the detection system compares the calculated total average thickness B of the filter plate and the mud cake with the design thickness A of the filter plate. If B≤A, it indicates that the mud cake on the surface of the filter plate has fallen off, the auxiliary mud unloading device does not work, and the filter press control system controls the plate pulling equipment to continue pulling the plate and unloading mud. The control unit of the detection system compares the calculated total average thickness B of the filter plate and the sludge cake with the design thickness A of the filter plate. If B > A, it indicates that the sludge cake on the surface of the filter plate has not fallen off. The filter press control system controls the auxiliary sludge unloading device to work once. After the auxiliary sludge unloading device finishes working once, the detection system scans again to obtain the sludge cake information. If the sludge cake still has not fallen off, the auxiliary sludge unloading device will work again. If the sludge cake falls off, the auxiliary sludge unloading device will stop working, and the filter press control system will control the plate pulling device to continue pulling the plate and unloading the sludge.

2. The automatic discharge control method of a filter press according to claim 1, characterized by, In step S1, the scanning end of the detection system moves synchronously with the plate-pulling device of the filter press during the sludge unloading process, and follows the pulled-out filter plate. After the filter plate is pulled out, it starts scanning the filter plate to obtain an image of the filter plate surface.

3. The automatic discharge control method of a filter press according to claim 1, characterized by, Once the auxiliary unloading device has worked on the same filter plate a preset number of times, the plate pulling device will continue to perform the plate pulling and unloading operation regardless of whether the mud cake falls off. The filter press control system will then alarm and record the operation.

4. The automatic sludge unloading control method for a filter press according to any one of claims 1 to 3, characterized in that, The filter press control system adopts a PLC control system.

5. The automatic sludge unloading control method for a filter press according to any one of claims 1 to 3, characterized in that, The scanning end of the detection system uses a camera, an array camera, or a combination of a camera and an infrared detector.

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