An automatic filter cloth breakage detection device

Abstract

This utility model discloses an automatic filter cloth damage detection device, belonging to the field of filter press technology. It includes a sampling tube and a turbidity meter. The sampling tube is connected to the filtrate discharge channel, and the filtrate passes through the sampling tube. The probe of the turbidity meter is installed in the sampling tube to detect the turbidity of the filtrate within the sampling tube. The turbidity meter is connected to an alarm device, which sounds an alarm when the detected filtrate turbidity reaches a preset value. This utility model installs a turbidity meter on the filtrate discharge channel of the filter press. The turbidity meter can perform real-time detection of the filtrate flowing through the sampling tube. Based on the change in filtrate turbidity, it determines whether there is filter cloth damage. When filter cloth damage is present, the filtrate turbidity will increase significantly. When the turbidity reaches the preset value, the alarm device is triggered, reminding the operator to replace the filter cloth in time. This eliminates the need for operators to frequently observe the filtrate clarity based on experience, freeing up labor and avoiding missed detections due to human negligence or fatigue.

Description

Technical Field

[0001] This utility model relates to the field of filter press technology, specifically to an automatic detection device for filter cloth damage. Background Technology

[0002] A filter press is a commonly used wastewater treatment device. Its principle is to use mechanical compression to force liquid substances (filtrate) through the filter medium (filter cloth), while solid substances (filter cake) are retained in the filter chamber, thus achieving separation. The condition of the filter cloth directly determines the filtration effect and the sustainability of the filtration operation. As a consumable item, the filter cloth has a relatively short lifespan and will eventually break, requiring replacement before the filter press can continue operating.

[0003] Currently, the condition of the filter cloth is determined entirely by visual inspection by the operator. Operators conduct routine inspections, observing the effluent and judging its turbidity to determine if the filter cloth is damaged. This manual inspection method lacks immediacy, is slow to respond, and is heavily reliant on the operator's conscientiousness. Failure to detect filter cloth damage in a timely manner may lead to contamination of the filtrate (when filtrate is needed); uneven filter cake formation due to filter cloth damage can, in severe cases, cause the filter plate to crack. Utility Model Content

[0004] To address the aforementioned technical shortcomings, the purpose of this utility model is to provide an automatic filter cloth damage detection device. By setting up a turbidity meter, the device can detect changes in the turbidity of the filtrate in real time, thereby determining whether the filter cloth is damaged.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: This utility model provides an automatic filter cloth damage detection device, which is installed on the filtrate discharge channel of a filter press, including: A sampling tube is connected to a filtrate discharge channel, through which the filtrate passes. A mixing mechanism is provided inside the sampling tube to stir the filtrate flowing through the sampling tube. The turbidimeter has a probe placed in a sampling tube to detect the turbidity of the filtrate in the sampling tube; the turbidimeter is connected to an alarm device, which sounds an alarm when the detected turbidity of the filtrate reaches a preset value.

[0006] Preferably, the sampling tube is arranged horizontally, with an inlet pipe at the front end and an outlet pipe at the rear end, and a horizontal flow divider is provided in the middle of the sampling tube. The flow divider divides the middle of the sampling tube into a mixing chamber and a direct flow chamber. The mixing mechanism is arranged in the mixing chamber, and the direct flow chamber is located above the mixing chamber.

[0007] Preferably, the sampling tube has a downwardly protruding cylinder in the middle, and the mixing chamber extends into the inner cavity of the cylinder.

[0008] Preferably, the mixing chamber is provided with a guide plate perpendicular to the diverting plate, so that the filtrate entering the mixing chamber from the inlet pipe is diverted by the guide plate and discharged from the outlet pipe.

[0009] Preferably, the mixing mechanism includes a rotating shaft rotatably installed inside the cylinder, the rotating shaft being located below the guide plate and having stirring blades fixed thereon, the rotating shaft agitating the filtrate inside the mixing chamber when it rotates.

[0010] Preferably, a sealing cover is connected to the bottom flange of the cylinder, the rotating shaft is rotatably sealed on the sealing cover, and a motor for driving the rotating shaft is fixed to the end of the sealing cover away from the cylinder.

[0011] Preferably, the probe is disposed in the mixing chamber on the side of the guide plate near the outlet pipe.

[0012] Preferably, a clamp is fixed on the guide plate, and the probe is fixed by the clamp.

[0013] Preferably, the end of the diverter plate inside the water inlet pipe is located at more than two-thirds of the height of the inner cavity of the water inlet pipe.

[0014] Preferably, the filtrate discharge channel is the filtrate manifold of the filter press, the water outlet pipe of each filter chamber of the filter press, or the filtrate drainage tank of the filter press.

[0015] The beneficial effects of this utility model are as follows: This invention features a turbidity meter installed on the filtrate discharge channel of a filter press. The turbidity meter can detect the filtrate flowing through the sampling tube in real time. Based on the changes in turbidity of the filtrate, it can determine whether the filter cloth is damaged. When the filter cloth is damaged, the turbidity of the filtrate will increase significantly. When the turbidity reaches the preset value, an alarm device is triggered to remind the operator to replace the filter cloth in time. This eliminates the need for operators to frequently observe the clarity of the filtrate based on experience, freeing up labor and avoiding missed detections due to human negligence or fatigue. This invention incorporates a mixing mechanism in the sampling tube. Since solid particles in the filtrate may be unevenly distributed or easily settle, this invention uses stirring blades to force-mix the filtrate, ensuring that the filtrate flowing through the probe is a uniformly mixed sample. This avoids lower measurement values ​​due to particle sedimentation, greatly improving the accuracy and reliability of the detection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram showing the installation position of an automatic filter cloth damage detection device provided for an embodiment of this utility model.

[0018] Figure 2 This is a perspective view of an automatic filter cloth damage detection device provided for an embodiment of the present utility model.

[0019] Figure 3 This is a side view of an automatic filter cloth damage detection device provided in an embodiment of the present utility model.

[0020] Figure 4 This is a top view of an automatic filter cloth damage detection device provided in an embodiment of the present invention.

[0021] Figure 5 for Figure 4 Sectional view at point AA.

[0022] Figure 6 The image shows a bottom-view perspective of an automatic filter cloth damage detection device provided in this embodiment of the present invention, after removing the sealing cover and the mixing mechanism.

[0023] Explanation of reference numerals in the attached figures: 1. Material pool, 2. Feed pump, 3. Filter press, 4. Filter cloth, 5. Filter plate, 6. Hydraulic station, 7. Sampling tube, 8. Filtrate discharge channel, 9. Turbidity meter, 10. Probe, 11. Inlet pipe, 12. Outlet pipe, 13. Diverter plate, 14. Mixing chamber, 15. Straight flow chamber, 16. Cylinder, 17. Guide plate, 18. Rotating shaft, 19. Stirring blades, 20. Sealing cover, 21. Motor, 22. Clamp. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1 like Figures 1 to 6As shown in Embodiment 1 of this utility model, an automatic filter cloth 4 damage detection device is mainly used for monitoring the integrity of the filter cloth 4 in a plate filter press 3. The feed pump 2 transports the material from the material pool 1 to each filter chamber of the filter press 3. The hydraulic station 6 drives the filter plate 5 to move and squeeze the filter cloth 4, thereby squeezing out the water from the material. The filtrate filtered from each filter chamber is collected in the filtrate discharge channel 8. The core design of this device is to determine whether the filter cloth 4 is damaged by real-time detection of the filtrate turbidity. The specific structure and working process are as follows: In this embodiment, the device is installed on the filtrate discharge channel 8 of the filter press 3, wherein the filtrate discharge channel 8 is selected from the filtrate manifold of the filter press 3. This design enables centralized sampling of the filtrate discharged from all filter chambers of the filter press 3, avoiding the limitations of single-chamber sampling. The device can also be installed in the filtrate manifold drainage tank of the filter press 3. The device can also be installed on the outlet pipe 12 (i.e., the outlet nozzle) of each filter chamber of the open-flow filter press 3, so that it can directly detect which filter cloth 4 is damaged. The sampling pipe 7 in this device is arranged horizontally, with the inlet pipe 11 and the outlet pipe 12 at its front and rear ends, respectively. The inlet pipe 11 is sealed to the filtrate manifold through a flange, and the outlet pipe 12 is sealed to the subsequent filtrate collection pipeline of the filter press 3 through a flange, forming a complete filtrate flow loop.

[0026] A horizontal flow divider 13 is fixedly installed in the middle of the sampling tube 7. One end of the flow divider 13 extends into the inlet pipe 11 and is located above two-thirds of the height of the inner cavity of the inlet pipe 11. This height design allows most (approximately 70%-80%) of the filtrate entering the inlet pipe 11 to flow into the lower region due to the obstruction of the flow divider 13, while a small portion of the filtrate containing air bubbles flows over the flow divider 13. Through the division of the flow divider 13, the middle part of the sampling tube 7 is divided into upper and lower cavities: the lower one is the mixing chamber 14, and the upper one is the direct flow chamber 15. At the same time, a downwardly protruding cylinder 16 is integrally formed in the middle of the sampling tube 7. The inner cavity of the cylinder 16 is connected to the mixing chamber 14, which expands the volume of the mixing chamber 14 and provides sufficient space for thorough mixing of the filtrate. A mixing mechanism is provided in the mixing chamber 14, and the probe 10 of the turbidimeter 9 is fixed in the mixing chamber 14. The turbidimeter 9 is also electrically connected to an alarm device (selected as a buzzer), and the operator can preset the turbidity threshold through the main unit of the turbidimeter 9.

[0027] After the filter press 3 is started, the filtrate enters the filtrate manifold through each filter chamber, and part of the filtrate enters the inlet pipe 11 of the sampling pipe 7 from the manifold. Under the action of the diverter plate 13, most of the filtrate enters the mixing chamber 14, and a small part of the filtrate with foam and bubbles flows along the direct flow chamber 15. The mixing mechanism forcibly stirs the filtrate in the mixing chamber 14 to make the solid particles in the filtrate (which will be generated if the filter cloth 4 is damaged) evenly dispersed, avoiding particle sedimentation. The probe 10 detects the turbidity of the filtrate in real time and transmits the signal to the turbidity meter 9 host. When the filter cloth 4 is damaged, the content of solid particles in the filtrate increases and the turbidity value rises. If the turbidity reaches the preset threshold, the turbidity meter 9 immediately triggers the alarm device, and the buzzer sounds an alarm to remind the operator to stop the machine and replace the filter cloth 4.

[0028] The combination of the flow divider 13 and the mixing mechanism ensures that the filtrate detected by the probe 10 is a uniformly mixed sample, avoiding detection errors caused by particle sedimentation. At the same time, it eliminates the need for operators to manually observe the clarity of the filtrate, significantly reducing labor intensity and the risk of missed detection.

[0029] Example 2 Based on Embodiment 1, this utility model further includes a guide plate 17 perpendicular to the diverting plate 13 within the mixing chamber 14. One end of the guide plate 17 is fixed to the inner wall of the sampling tube 7, and the other end extends to the middle of the cylinder 16. Its function is to change the flow direction of the filtrate. The filtrate entering the mixing chamber 14 from the inlet pipe 11 will be diverted by the obstruction of the guide plate 17, and then flow along the guide plate 17 towards the outlet pipe 12, finally being discharged from the outlet pipe 12. The mixing mechanism within the mixing chamber 14 includes a rotating shaft 18 rotatably mounted inside the cylinder 16. The axis of the rotating shaft 18 is perpendicular to the axis of the sampling tube 7 and is located directly below the guide plate 17. Multiple stirring blades 19 are evenly fixed on the rotating shaft 18. The stirring blades 19 are made of rectangular stainless steel, and a 5-8mm gap is left between their edges and the inner wall of the cylinder 16 to prevent friction with the cylinder 16 during rotation.

[0030] A sealing cover 20 is connected to the bottom of the cylinder 16 via a flange. The flange connection is sealed with a sealing ring to prevent filtrate leakage. The rotating shaft 18 is mounted on the sealing cover 20 via a rotating seal (using a mechanical seal structure) to ensure that the filtrate does not leak from the sealing cover 20 when the rotating shaft 18 rotates. A motor 21 is bolted to the end of the sealing cover 20 away from the cylinder 16. The output shaft of the motor 21 is connected to the rotating shaft 18 via a coupling. When the motor 21 starts, it drives the rotating shaft 18 to rotate, which in turn drives the stirring blades 19 to stir the filtrate in the mixing chamber 14. The guide plate 17 guides the filtrate to flow through the stirring blades 19.

[0031] The probe 10 of the turbidity meter 9 is set in the mixing chamber 14 on the side of the guide plate 17 near the outlet pipe 12. In order to ensure the stability of the probe 10 and facilitate disassembly and assembly, an arc-shaped clamp 22 is welded and fixed on the guide plate 17. The probe 10 is clamped and fixed by the clamp 22, and the detection end of the probe 10 is completely immersed in the filtrate in the mixing chamber 14.

[0032] After the filter press 3 is started, the filtrate enters the inlet pipe 11 of the sampling pipe 7 from the main manifold; under the action of the diverter plate 13, most of the filtrate enters the mixing chamber 14; at the same time, the motor 21 starts and drives the stirring blade 19 to rotate, forcibly stirring the filtrate in the mixing chamber 14 to avoid particle sedimentation and improve the accuracy of the turbidity meter 9.

[0033] Example 3 Based on Embodiments 1 and 2, the alarm device used in this invention is an audible and visual alarm device, including a red LED warning light and a high-decibel buzzer, and the audible and visual alarm device is electrically connected to the control system of the filter press 3. When the turbidity of the filtrate reaches a preset threshold, not only will the audible and visual alarm device be activated, but the control system will also send a signal to slow down the feed pump 2 of the filter press 3 (reduce the feed pressure), giving the operator time to replace the filter cloth 4 and preventing further damage to the filter cloth 4 that could lead to more solid particles entering the filtrate.

[0034] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. An automatic filter cloth damage detection device, characterized in that, It is installed on the filtrate discharge channel of the filter press, including: A sampling tube is connected to a filtrate discharge channel, through which the filtrate passes. A mixing mechanism is provided inside the sampling tube to stir the filtrate flowing through the sampling tube. The turbidimeter has a probe placed in a sampling tube to detect the turbidity of the filtrate in the sampling tube; the turbidimeter is connected to an alarm device, which sounds an alarm when the detected turbidity of the filtrate reaches a preset value.

2. The automatic filter cloth damage detection device as described in claim 1, characterized in that, The sampling tube is arranged horizontally, with an inlet pipe at the front end and an outlet pipe at the rear end. A horizontal flow divider is provided in the middle of the sampling tube, which divides the middle of the sampling tube into a mixing chamber and a direct flow chamber. The mixing mechanism is located inside the mixing chamber, and the direct flow chamber is located above the mixing chamber.

3. The automatic filter cloth damage detection device as described in claim 2, characterized in that, The sampling tube has a downward-protruding cylinder in the middle, and the mixing chamber extends into the inner cavity of the cylinder.

4. The automatic filter cloth damage detection device as described in claim 3, characterized in that, The mixing chamber is equipped with a guide plate perpendicular to the flow divider plate. The filtrate entering the mixing chamber from the inlet pipe is diverted by the guide plate and then discharged from the outlet pipe.

5. The automatic filter cloth damage detection device as described in claim 4, characterized in that, The mixing mechanism includes a rotating shaft rotatably installed inside the cylinder. The rotating shaft is located below the guide plate and has stirring blades fixed on it. When the rotating shaft rotates, it disturbs the filtrate in the mixing chamber.

6. The automatic filter cloth damage detection device as described in claim 5, characterized in that, The bottom flange of the cylinder is connected to a sealing cover, and the rotating shaft is rotatably sealed on the sealing cover. A motor for driving the rotating shaft is fixed to the end of the sealing cover away from the cylinder.

7. The automatic filter cloth damage detection device as described in claim 4, characterized in that, The probe is positioned inside the mixing chamber on the side of the guide plate near the outlet pipe.

8. The automatic filter cloth damage detection device as described in claim 7, characterized in that, The guide plate is fixed with a clamp, and the probe is fixed by the clamp.

9. The automatic filter cloth damage detection device as described in claim 2, characterized in that, The end of the diverter plate inside the water inlet pipe is located at more than two-thirds of the height of the inner cavity of the water inlet pipe.

10. The automatic filter cloth damage detection device as described in claim 1, characterized in that, The filtrate discharge channel is the filtrate manifold of the filter press, the outlet pipe of each filter chamber of the filter press, or the filtrate drainage tank of the filter press.

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