A kind of plate frame machine diaphragm plate breakage self-checking device

Abstract

The utility model discloses a kind of plate and frame machine diaphragm plate breakage self-checking devices, comprising: water storage tank, extrusion pump, flow rate sensor, diaphragm filter plate and control assembly;Water storage tank, extrusion pump, flow rate sensor and diaphragm filter plate are sequentially communicated by water delivery pipeline, and the flow rate sensor is electrically connected with control assembly;Extrusion pump is used to pressurize the water of water storage tank after and is delivered to diaphragm filter plate in water delivery pipeline and flow rate sensor, and flow rate sensor is used to measure the water flow rate in diaphragm filter plate, and data is transmitted to control assembly, and control assembly is used to display the water injection flow rate of diaphragm filter plate in real time, when the water injection flow rate of diaphragm filter plate exceeds preset range value, control assembly alarms.The utility model has the characteristics of compact structure, convenient operation, high reliability, realizes the breakage condition of accurate monitoring diaphragm plate.

Description

Technical Field

[0001] This utility model relates to the field of sludge treatment technology, specifically to a self-inspection device for diaphragm plate damage in a plate and frame machine. Background Technology

[0002] Sludge dewatering is a crucial step in sludge treatment. This step utilizes plate and frame filter press technology to separate dry solids from liquids in the sludge. Plate and frame filter press dewatering technology is an important research direction in the field of sludge treatment. The plate and frame filter press achieves solid-liquid separation through mechanical pressure. Its advantage lies in processing highly viscous and difficult-to-dewater sludge (such as municipal sewage and industrial wastewater sludge), reducing the moisture content of the filter cake to 30%–60%.

[0003] The core components of a plate and frame filter press include alternating chamber plates, diaphragm plates, and filter cloth (the chamber plates and diaphragm plates are collectively referred to as filter plates). Sludge enters the filter chamber under the action of a high-pressure pump for primary filtration. The alternating diaphragm plates expand and deform under the pressure of water, thus squeezing the sludge inside the filter chamber for secondary filtration; this process is called "pressure filtration." Water passes through the filter cloth and is discharged to produce filtrate, while solid particles are retained to form a filter cake. With technological development and progress, the material of the filter plates has changed from traditional metal to polypropylene (PP), which has advantages in corrosion resistance, lightweight, and cost. Simultaneously, to enhance dewatering efficiency and reduce the moisture content of the filter cake, the application of high-pressure technology has increased the maximum pressure that the filter plates can withstand to 1.6–2.5 MPa. Through practical engineering application analysis, high-pressure working conditions and complex mud properties can easily cause irreversible damage to filter plates, especially diaphragm plates. Under extreme conditions, if large-area damage to the diaphragm plate is not detected in time, squeezed water will enter the filter chamber from the damaged area, causing leakage. On the one hand, this will reduce the solid content of the filter cake and affect the quality of the filter cake; on the other hand, it will increase the amount of production water used, the amount of filtrate generated, and the treatment cost.

[0004] Currently, the methods and devices for inspecting diaphragm plate damage in plate and frame milling machines have the following deficiencies: (1) Normally, an industrial plate and frame machine has dozens to hundreds of diaphragm plates. It is time-consuming and laborious to check them one by one by manual. The damaged parts are sometimes difficult to find. The filter cloth covering the surface further increases the difficulty of manual search.

[0005] (2) Offline detection requires shutdown and production stoppage, which affects production efficiency.

[0006] (3) The diaphragm plates of the plate and frame machine are inspected by water injection / air pressure, which is labor-intensive, inefficient, inaccurate, and prone to damage to the filter plates due to misoperation. Utility Model Content

[0007] The technical problem this utility model aims to solve is to address the defects caused by the diaphragm plate of a plate and frame filter press during the sludge dewatering process, which leads to leakage of squeeze water, resulting in increased production water consumption and wastewater generation, as well as a decrease in the solid content of the filter cake. The present invention provides a self-inspection device for diaphragm plate damage of a plate and frame filter press that is compact in structure, easy to operate, highly automated, efficient, and accurate.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A self-inspection device for diaphragm plate damage in a plate and frame mill includes: a water storage tank, a squeeze pump, a flow rate sensor, a diaphragm filter plate, and a control component. The water storage tank, squeeze pump, flow rate sensor, and diaphragm filter plate are connected sequentially via a water supply pipeline. The flow rate sensor is electrically connected to the control component. The squeeze pump pressurizes water from the water storage tank and delivers it to the diaphragm filter plate via the water supply pipeline and the flow rate sensor. The flow rate sensor measures the water flow rate entering the diaphragm filter plate and transmits the data to the control component. The control component displays the water injection rate of the diaphragm filter plate in real time. When the water injection rate of the diaphragm filter plate exceeds a preset range, the control component issues an alarm.

[0009] As a further improvement of this utility model, the control component includes a PLC controller and a display terminal connected to each other, and the flow rate sensor is electrically connected to the PLC controller.

[0010] As a further improvement of this utility model, the display terminal is equipped with an audible and visual alarm.

[0011] As a further improvement of this utility model, the extrusion pump is a variable frequency pump.

[0012] As a further improvement of this utility model, the diaphragm filter plate is provided with an expandable and contractible inner cavity, the inner cavity is provided with a water inlet, and the water inlet is connected to a water supply pipe to realize pressurized water entering and exiting the inner cavity.

[0013] As a further improvement of this utility model, it also includes a return water pipe, the inlet of which is connected to the water supply pipe and the inlet of which is located between the squeeze pump and the flow rate sensor, and the outlet of which is connected to the water storage tank, so as to realize the circulation of water discharged from the diaphragm filter plate into the water storage tank.

[0014] As a further improvement of this utility model, the return water pipe is equipped with an electric valve to control the opening and closing of the return water pipe.

[0015] As a further improvement of this utility model, the water storage tank is equipped with a level gauge for real-time monitoring of the water level in the tank.

[0016] Compared with the prior art, the advantages of this utility model are: This utility model relates to a self-inspection device for diaphragm plate damage in plate and frame filter presses. It utilizes the principle that the inner chamber of the diaphragm filter plate is filled during the extrusion and pressure-holding stage, and there is no flow after the extruded water maintains constant pressure. A flow rate sensor is installed on the water supply pipeline to monitor the water flow rate signal entering the diaphragm filter plate in real time and transmit it to the control component. The control component then analyzes the relationship between the preset alarm flow rate range of the diaphragm filter plate and the actual flow rate, providing monitoring results and alarm prompts. This achieves the purpose of self-inspection and alarm, solving the problem of timely detection of diaphragm filter plate damage in the plate and frame filter press process. It improves the accuracy of filter plate damage identification, increases production efficiency and automation level, and reduces the intensity of manual operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the structural principle of the self-inspection device for diaphragm plate damage in a specific embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the structural principle of the diaphragm filter plate in a specific embodiment of this utility model; Figure 3 This is a schematic diagram of the flow sensor arrangement in a specific embodiment of the present invention.

[0018] Legend: 1. Water storage tank; 2. Squeezing pump; 3. Flow rate sensor; 301. Sensor No. 1; 4. Diaphragm filter plate; 401. Filter No. 1; 41. Inner chamber; 42. Inlet and outlet; 5. PLC controller; 6. Display terminal; 71. Water supply pipeline; 72. Return water pipeline; 8. Electric valve; 9. Level gauge. Detailed Implementation

[0019] 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.

[0020] In the description of this utility model, it should be understood that the terms "side", "center", "longitudinal", "transverse", "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 utility model and simplifying the description, and do not 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 utility model.

[0021] 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 utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0022] Example like Figure 1 and Figure 3 As shown, the self-inspection device for diaphragm plate damage in a plate and frame mill of this utility model includes: a water storage tank 1, a squeeze pump 2, a flow rate sensor 3, a diaphragm filter plate 4, a PLC controller 5, and a display terminal 6. The water storage tank 1, squeeze pump 2, flow rate sensor 3, and diaphragm filter plate 4 are connected sequentially via a water supply pipe 71. The flow rate sensor 3 is electrically connected to the PLC controller 5, and the PLC controller 5 is electrically connected to the display terminal 6. The squeeze pump 2 pressurizes the water in the water storage tank 1 and delivers it to the diaphragm filter plate 4 via the water supply pipe 71 and the flow rate sensor 3. The flow rate sensor 3 measures the water flow velocity entering the diaphragm filter plate 4 and transmits the data to the PLC controller 5. The flow rate sensor 3 is a small flow rate sensor with a measurement accuracy of 0.01 m / s, which can accurately measure the squeezed water flow velocity. The PLC controller 5 compares the received data with preset data and transmits the comparison result to the display terminal 6, which displays the water injection status of the diaphragm filter plate 4 in real time. Based on the principle that the inner chamber of the diaphragm filter plate 4 is filled during the extrusion and pressure holding stage, and the extruded water has no flow after maintaining constant pressure, the system can monitor the extruded water flow rate during the extrusion and pressure holding stage of the diaphragm filter plate 4 in real time to determine whether the filter plate is damaged, the location of the damage, and the degree of damage, and issue an alarm through the display terminal 6.

[0023] like Figure 3 As shown, in this embodiment, 2 to 5 diaphragm filter plates 4 can share a single flow sensor 3. By numbering the diaphragm filter plates 4 and the flow sensor 3, for example, the diaphragm filter plates 4 are sequentially numbered as filter plate 1 401, filter plate 2 402, etc., and the flow sensor 3 is numbered as sensor 1 301, sensor 2 302, etc., real-time damage monitoring of each diaphragm filter plate 4 in the plate and frame machine can be achieved, improving the reliability of the plate and frame machine operation. Furthermore, the display terminal 6 is equipped with an audible and visual alarm. Specifically, the audible and visual alarm operates during the compression and pressure holding stage, and is tiered. When the PLC controller 5 detects V=0, meaning the flow rate sensor 3 does not detect water flow, it indicates that the diaphragm filter plate 4 is in normal working condition, and the audible and visual alarm displays green. When the PLC controller 5 detects 0<V≤1, more preferably 0<V≤0.5, the flow rate sensor 3 detects water flow, indicating that the diaphragm filter plate 4 is slightly damaged, and the audible and visual alarm displays yellow. When the PLC controller 5 detects V>1, more preferably V>0.5, the flow rate sensor 3 detects a high water flow rate, indicating that the diaphragm filter plate 4 is severely damaged, and the audible and visual alarm displays red.

[0024] In this embodiment, utilizing the principle that the inner chamber of the diaphragm filter plate 4 is filled during the extrusion and pressure holding stage, and that there is no flow after the water pressure is maintained at a constant level, a flow rate sensor 3 is installed on the water supply pipeline 71 to monitor the water flow rate entering the diaphragm filter plate 4 in real time and transmit it to the PLC controller 5. The PLC controller 5 then analyzes the relationship between the preset inlet water flow rate and the actual inlet water flow rate of the diaphragm filter plate 4 and transmits the comparison result to the display terminal 6. The display terminal 6 displays the monitoring results and makes corresponding alarm prompts, achieving the purpose of self-inspection and alarm, improving the accuracy of filter plate damage judgment, improving production efficiency and automation level, and reducing the intensity of manual operation.

[0025] like Figure 2 As shown, the diaphragm filter plate 4 is provided with an expandable and contractible inner chamber 41, and the maximum volume of the inner chamber 41 remains constant during the compression stage. The inner chamber 41 is provided with inlet and outlet ports 42, which are connected to the water supply pipe 71 to realize the entry and exit of pressurized water into and out of the inner chamber 41. The compression pump 2 is a variable frequency pump, which controls the pressure in the inner chamber 41 of the diaphragm filter plate 4 at 15-25 bar through frequency conversion control to ensure that the sludge compression achieves the preset drying effect.

[0026] like Figure 1 As shown, it also includes a return water pipe 72 equipped with an electric valve 8. The inlet of the return water pipe 72 is connected to the water supply pipe 71, and the inlet of the return water pipe 72 is located between the squeeze pump 2 and the flow sensor 3. The outlet of the return water pipe 72 is connected to the water storage tank 1 so as to realize the circulation of water discharged from the diaphragm filter plate 4 into the water storage tank 1.

[0027] like Figure 1As shown, a level gauge 9, electrically connected to the PLC controller 5, is also installed in the water storage tank 1 to monitor the liquid level changes in the tank in real time. The signal priority of the level gauge 9 is lower than that of the flow rate sensor 3. During the pressure-holding stage of the diaphragm filter plate 4, if the information from the flow rate sensor 3 does not trigger an alarm signal, and the signal from the level gauge 9 is greater than 0.01 m / min, an alarm is automatically triggered. This prevents inaccurate detection of diaphragm filter plate 4 damage due to flow rate sensor 3 malfunction, providing dual protection. This effectively solves the problem of timely detection of diaphragm filter plate 4 damage during plate and frame filter press production. It offers good performance, high accuracy, and automated, continuous operation without manual intervention, significantly reducing labor intensity and effectively improving production efficiency.

[0028] During the operation of a plate and frame filter press, when the press enters the extrusion process, the extrusion water in the storage tank 1 is pressurized by the extrusion pump 2 and enters the inner chamber 41 of the diaphragm filter plate 4. The diaphragm filter plate 4 expands and deforms, extruding the filter cake on both sides of the filter plate. After the extrusion pressure is maintained for a certain period of time, the extrusion pump 2 stops running, the extrusion water in the diaphragm filter plate 4 returns to the storage tank 1, and the plate and frame filter press enters the sludge unloading process. During the extrusion and pressure holding process, the flow rate of the extruded water measured by the flow rate sensor 3 is transmitted to the PLC controller 5. The PLC controller 5 compares and analyzes the monitored flow rate with the preset flow rate through the corresponding preset module: V=0 indicates that there is no extruded water leakage in this group of filter plates, the filter plate chamber is well sealed, and the audible and visual alarm displays green; 0<V≤0.5 indicates that there is slight damage to this group of filter plates, the audible and visual alarm displays yellow, and depending on the production situation, the processing can be temporarily suspended or the machine can be stopped for inspection of this group of filter plates; V>0.5 indicates that there is serious damage to this group of filter plates, the audible and visual alarm is red and an audible warning is given, and the machine needs to be stopped immediately for inspection. The PLC controller 5 transmits the monitoring information to the information display terminal 6 in real time and displays the group number of the corresponding diaphragm filter plate 4, completing the system's self-inspection of the damage status of the diaphragm filter plates 4 during the automatic operation of the plate and frame machine.

[0029] The above flow rate parameters are set based on actual application needs or experience. Taking a plate and frame filter press with a batch processing time of 2 hours and a pressing and holding time of 15 minutes as an example, if the pressing water flow rate of a certain group of filter plates is 0.5 m / s and the pressing water branch pipe diameter is DN50, then the pressing water leakage is 0.88 m³ / s. 3 That is, a single plate and frame filter press will theoretically consume 10m³ of filter plates per day. 3 The squeezed water permeates the filter cloth into the filter cake, causing the moisture content to increase. At the same time, most of the squeezed water enters the filtrate, increasing the amount of wastewater generated.

[0030] The automatic operation of the aforementioned damage self-inspection device enables the graded judgment of the damage status of the diaphragm filter plate 4 of the plate and frame machine, with an accuracy rate of over 95%. It achieves the function of accurately locating damaged filter plates, eliminating the tedious work of manual inspection, and effectively reducing the situation of substandard filter cake and the generation of filtrate.

[0031] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected by this utility model. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A self-inspection device for diaphragm plate damage in a plate and frame mill, characterized in that, include: The water storage tank (1), squeeze pump (2), flow rate sensor (3), diaphragm filter plate (4), and control component are connected in sequence through water supply pipe (71). The flow rate sensor (3) is electrically connected to the control component. The squeeze pump (2) is used to pressurize the water in the water storage tank (1) and then transport it to the diaphragm filter plate (4) through the water supply pipe (71) and the flow rate sensor (3). The flow rate sensor (3) is used to measure the water flow rate entering the diaphragm filter plate (4) and transmit the data to the control component. The control component is used to display the water injection rate of the diaphragm filter plate (4) in real time. When the water injection rate of the diaphragm filter plate (4) exceeds the preset range value, the control component will issue an alarm.

2. The self-inspection device for diaphragm plate damage in a plate and frame machine according to claim 1, characterized in that, The control components include a PLC controller (5) and a display terminal (6) connected to each other, and the flow rate sensor (3) is electrically connected to the PLC controller (5).

3. The self-inspection device for diaphragm plate damage in a plate and frame machine according to claim 2, characterized in that, The display terminal (6) is equipped with an audible and visual alarm.

4. The self-inspection device for diaphragm plate damage of a plate and frame mill according to any one of claims 1 to 3, characterized in that, The extrusion pump (2) is a variable frequency pump.

5. The self-inspection device for diaphragm plate damage in a plate and frame machine according to claim 4, characterized in that, The diaphragm filter plate (4) is provided with an expandable and contractible inner chamber (41), and the inner chamber (41) is provided with an inlet and outlet (42). The inlet and outlet (42) are connected to the water supply pipe (71) to realize pressurized water entering and exiting the inner chamber (41).

6. The self-inspection device for diaphragm plate damage of a plate and frame mill according to any one of claims 1 to 3, characterized in that, It also includes a return water pipe (72), the inlet of which is connected to the water supply pipe (71), and the inlet of the return water pipe (72) is located between the squeeze pump (2) and the flow sensor (3). The outlet of the return water pipe (72) is connected to the water storage tank (1) so as to realize the circulation of water discharged from the diaphragm filter plate (4) into the water storage tank (1).

7. The self-inspection device for diaphragm plate damage in a plate and frame machine according to claim 6, characterized in that, An electric valve (8) is provided on the return water pipe (72) to control the opening and closing of the return water pipe (72).

8. The self-inspection device for diaphragm plate damage of a plate and frame machine according to any one of claims 1 to 3, characterized in that, The water storage tank (1) is equipped with a level gauge (9) for real-time monitoring of the water level in the water storage tank (1).

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