A clarification filtration control system for filter press

Abstract

The application discloses a clarification filter detection and control system for a filter press, which comprises a collecting main pipe, a main pipe detection device and a single plate detection and control device fixed on the collecting main pipe, the single plate detection and control device comprises a valve island, at least one detection loop is arranged in the valve island, each detection loop comprises a clarification liquid flow channel, a detection flow channel and a liquid inlet flow channel connected with a filter plate, a turbidity sensor is arranged in the detection flow channel, a switching valve mechanism for switching the detection flow channel and the clarification liquid flow channel is fixed on the valve island, the switching valve mechanism has an initial state and a detection state, the main pipe detection device is used for detecting the filtrate turbidity of the clarification liquid channel, and the single plate detection and control device is switched from the initial state to the detection state when the main pipe detection device detects that the filtrate turbidity in the clarification liquid channel reaches a set value. The system can switch the filtrate and automatically perform single plate positioning detection immediately when the overall detection shows that there is turbidity running, so that the timeliness and accuracy of turbidity running detection are improved, the detection time is shortened, and the labor intensity is reduced.

Description

Technical Field

[0001] This invention relates to the field of solid-liquid separation technology, and more specifically to a clarification filtration control system for a filter press. Background Technology

[0002] In the actual use of filter presses, the problem of turbidity caused by filter cloth damage has always been one of the main challenges in clarification filtration, especially in the field of dark flow filtration. This is manifested in the difficulty of timely detection and accurate location, and even if the location is accurate, it cannot be dealt with in a timely manner, which is quite a headache for users.

[0003] To address the aforementioned technical issues, patent document CN202844664U discloses a device for detecting filter cloth on diaphragm plates in a dark-flow filter press. This device first opens the control valve at the sampling port on the filtrate collection pipe to release some filtrate and test its quality. This allows for the determination of whether any filter cloth is damaged. If the filtrate is unclear, it indicates that the filter cloth is damaged. Then, the sampling ports located on the filter plates are opened sequentially for manual testing; turbidity corresponds to filter cloth damage. This allows for the inspection of each filter plate and direct manual determination of whether the filter cloth is damaged. However, this technology still has the following technical problems in practical applications:

[0004] 1. The device does not specify how or when to open the control valve for testing. It is possible that the device has already run into turbidity, but the lack of valve opening for testing has resulted in poor timeliness of the detection.

[0005] 2. After the device detects that the filter cloth is damaged, the user still needs to check each one individually, which lacks long-term operability; at the same time, since the filtrate is more or less contaminating, the observation tube may be quickly contaminated, making it impossible for the user to make an immediate and accurate judgment on whether the filter cloth has become turbid.

[0006] 3. During the detection process, the turbid filtrate will continue to flow into the filtrate collection pipe, which is not conducive to the continuous control of material clarification and filtration. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned technical problems existing in the prior art and to provide a clarification filtration control system for filter presses. This system uses the principle that the detection element can detect the solid content of the liquid to determine whether the filter cloth is in a turbid state. It uses multi-channel switching detection to quickly locate the turbid filter cloth and shut off the filtrate of the filter cloth. This not only improves the timeliness and accuracy of turbidity detection, shortens the detection time and reduces the intensity of manual labor, but also facilitates the continuous control of material clarification filtration.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A clarification filtration control system for a filter press, characterized in that it includes a manifold, which comprises a clarified liquid channel and a detection liquid channel. A main pipe detection device and a single-plate detection device are fixed on the manifold. The single-plate detection device includes a valve island fixed on the manifold, and the valve island has at least one detection loop. Each detection loop includes a clarified liquid channel, a detection channel, and an inlet channel connected to the filter plate. The two ends of the clarified liquid channel are respectively connected to the inlet channel and the clarified liquid channel, and the two ends of the detection channel are respectively connected to the inlet channel and the detection liquid channel. The system includes a turbidity sensor installed in the detection channel; a switching valve mechanism is fixed on the valve island to switch between the detection channel and the clarified liquid channel. The switching valve mechanism has an initial state and a detection state. In the initial state, the switching valve mechanism controls the connection between the inlet channel and the clarified liquid channel. In the detection state, the switching valve mechanism controls the connection between the inlet channel and the detection channel. The main pipe detection device is used to detect the turbidity of the filtrate in the clarified liquid channel. The single-board detection and control device switches from the initial state to the detection state when the main pipe detection device detects that the turbidity of the filtrate in the clarified liquid channel reaches a set value.

[0010] The main pipe detection device includes a valve seat with a filtrate inlet, a filtrate outlet, and a multi-channel detection unit. The filtrate inlet is connected to the clarified liquid channel. Each detection unit includes a flow channel, a channel switching mechanism, and a turbidity detector. The turbidity detector is fixed in the flow channel via the valve seat to detect the turbidity of the filtrate. The channel switching mechanism is fixed on the valve seat to control the opening and closing of the flow channel. The flow channels of the multi-channel detection units are connected in parallel between the filtrate inlet and the filtrate outlet. The multi-channel detection units cooperate to form a detection structure that allows one device to be used for multiple purposes.

[0011] The number of detection units is four, and the four detection units cooperate to form a detection structure of one use and three votes.

[0012] The channel switching mechanism includes a cylinder body, a cylinder head, and a pneumatic control valve core assembly. The cylinder head, cylinder body, and pneumatic control valve core assembly are connected in series from top to bottom and fixed on the valve seat to form the channel switching mechanism. The cylinder head is pressed and fixed to the cylinder body by several long screws fixed on the valve seat, and the cylinder head is provided with air distribution holes corresponding to the cylinder body.

[0013] In the main pipe testing device, each testing unit shares a cylinder head, and each testing unit is paired up and controlled by a three-position five-way central leakage solenoid valve mounted upside down on the cylinder head through the air distribution port. Each solenoid valve is driven by the same power air pipe.

[0014] The pneumatically controlled valve core assembly includes a pneumatically controlled piston, an elastic reset member, a pneumatically controlled valve core, and a pneumatically controlled cylinder head. The pneumatically controlled cylinder head is fixed between the cylinder body and the valve seat. The pneumatically controlled piston is movably disposed within the cylinder body. The elastic reset member is located between the pneumatically controlled piston and the pneumatically controlled cylinder head. One end of the pneumatically controlled valve core is fixed to the pneumatically controlled piston, and the other end passes through the elastic reset member and the pneumatically controlled cylinder head in sequence to control the opening and closing of the flow channel.

[0015] The single-board detection and control device also includes a shut-off valve mechanism fixed on the valve island for cutting off the liquid inlet flow channel. The shut-off valve mechanism has a normally open state and a shut-off state. The shut-off state is used to cut off the liquid inlet flow channel after the filter cloth is found to be turbid.

[0016] The switching valve mechanism includes a switching cylinder barrel, a switching cylinder head, and a pneumatic switching valve core assembly. The switching cylinder head, the switching cylinder barrel, and the pneumatic switching valve core assembly are connected in series from top to bottom on the valve island to form the switching valve mechanism. The switching cylinder head is provided with an air distribution hole corresponding to the switching cylinder barrel.

[0017] The shut-off valve mechanism includes a shut-off cylinder barrel, a shut-off cylinder head, and a pneumatic shut-off valve core assembly. The shut-off cylinder head, the switching cylinder barrel, and the pneumatic shut-off valve core assembly are connected in series from top to bottom on the valve island to form the shut-off valve mechanism. The shut-off cylinder head is provided with an air distribution hole corresponding to the shut-off cylinder barrel.

[0018] The switching cylinder head and the cut-off cylinder head share a common valve head. The valve head is tightened and fixed to the switching cylinder and the cut-off cylinder by several long screws fixed to the valve island. The switching valve mechanism and the cut-off valve mechanism are controlled by a three-position five-way leakage solenoid valve mounted on the valve head through the valve port.

[0019] The number of switching valve mechanisms and the number of shut-off valve mechanisms are the same as the number of detection circuits. When the number of switching valve mechanisms and the number of shut-off valve mechanisms are both greater than one set, the solenoid valves are reversed and driven by the same power air pipe.

[0020] The pneumatic switching valve core assembly includes a switching piston, a switching reset spring, a switching valve core, and a switching cylinder head. The switching cylinder head is fixed between the switching cylinder barrel and the valve island. The switching piston is movably disposed inside the switching cylinder barrel. The switching reset spring is located between the piston and the switching cylinder head. One end of the switching valve core is fixed on the switching piston, and the other end passes through the switching spring and the switching cylinder head in sequence to switch between the initial state and the detection state.

[0021] The pneumatic shut-off valve core assembly includes a shut-off piston, a shut-off return spring, a shut-off valve core, and a shut-off cylinder head. The shut-off cylinder head is fixed between the shut-off cylinder barrel and the valve island. The shut-off piston is movably disposed inside the shut-off cylinder barrel. The shut-off return spring is located between the piston and the shut-off cylinder head. One end of the shut-off valve core is fixed on the shut-off piston, and the other end passes through the shut-off spring and the shut-off cylinder head in sequence to switch between the normally open state and the shut-off state.

[0022] The advantages of using this invention are:

[0023] 1. This invention allows the filter press to immediately enter single-plate detection mode upon detecting turbidity using the main pipe detection device. In the single-plate detection device, the initial state (normal position) is first switched to detection mode via a switching valve mechanism. In detection mode, the detection channel is connected to the inlet channel. At this time, the turbidity sensor in the detection channel detects the turbidity of the filtrate separately, comparing it to a preset threshold to determine if the corresponding filter cloth is damaged and turbid. When damage and turbidity are confirmed, the corresponding switching valve mechanism continues to maintain detection mode. The turbid filtrate is discharged through the detection channel into the detection liquid channel, while the switching valve mechanisms of other normal filter plates can switch back to the initial state for normal filtration. This ensures that the turbid filtrate does not continue to contaminate other clarified liquid channels and does not affect the normal operation of the filtration process. In summary, this invention utilizes the principle that the detection element can detect the solid content of liquid to determine whether the filter cloth is in a turbid state. It uses multi-channel switching detection to quickly locate the turbid filter cloth and shut off the filtrate of the filter cloth. This not only improves the timeliness and accuracy of turbidity detection, shortens the detection time and reduces the intensity of manual labor, but also makes it more conducive to the control of material clarification and filtration.

[0024] 2. This invention utilizes multiple detection units to form a multi-voting detection structure. This structure enables multi-voting detection of the filtrate. Specifically, when one detection unit detects that the filtrate turbidity has reached a set value and is becoming cloudy, the results from other detection units are used to vote on the result of that detection unit, thus achieving accurate detection of turbidity. It should be noted that since most slurries to be filtered have some degree of scaling ability, using only a single turbidity detector may result in numerous false alarms due to scaling, further increasing the workload. Therefore, this invention's multi-voting detection structure effectively solves the technical problem of false alarms caused by scaling.

[0025] In summary, this invention can detect whether the filtrate is turbid in real time, and can obtain accurate detection results by voting when turbidity occurs. At the same time, it can also prevent the turbidity detector from making false alarms due to scaling. It has the advantages of better timeliness, higher accuracy and better practicality.

[0026] 3. The present invention uses four detection units to form a detection structure with one function and three votes. Its advantage is that it can improve the accuracy of detection without excessive cost and overly complex structure, and is more practical.

[0027] 4. The present invention uses a cylinder body, cylinder head and pneumatic control valve core assembly to form a channel switching mechanism, which has the advantages of simple structure, convenient operation, accurate control and low cost.

[0028] 5. In this invention, all detection units share a cylinder head, and the two detection units are controlled by the same three-position five-way central leakage solenoid valve. Furthermore, each solenoid valve is controlled through the same power air pipe. This not only helps to simplify the device structure and reduce the overall size of the device, but also helps to reduce the number of pipes and simplify the structure, and is more conducive to the accurate control of the channel switching mechanism.

[0029] 6. This invention, through a shut-off valve mechanism, can cut off the corresponding inlet flow channel when damage to the filter plate or filter cloth is detected, thereby stopping the filtration of the corresponding filter plate. Furthermore, by coordinating the shut-off valve mechanism with the switching valve mechanism, this invention can automatically, quickly, and accurately locate the filter plate that is leaking turbidity and take timely action, improving the timeliness and accuracy of clarification filtration control, enhancing the overall efficiency of the device, ensuring the long-term reliability of the filter press, and optimizing the arrangement of subsequent processing work.

[0030] 7. In this invention, the cut-off valve mechanism and the switching valve mechanism are set to share a common air distribution cylinder head, both controlled by a three-position five-way central leakage solenoid valve mounted in reverse on the air distribution cylinder head through the air distribution hole, and the solenoid valve is mounted in reverse and controlled through the same power air pipe. Its advantage is that it reduces piping and realizes the single-line air pipe series drive of all detection and control circuits.

[0031] 8. The number of detection circuits in this invention is at least one, which can be set to two or more as needed, so that a single board detection and control device can detect two or more filter boards at the same time, which can take into account both manufacturing convenience and configuration flexibility. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0033] Figure 2 This is a three-dimensional structural diagram of the present invention connected to a filter press;

[0034] Figure 3 This is a three-dimensional structural diagram of the main pipe detection device;

[0035] Figure 4 This is a cross-sectional structural diagram of the main pipe inspection device;

[0036] Figure 5 This is a schematic diagram of the planar structure of a single-board detection and control device, which includes two detection loops.

[0037] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure;

[0038] Figure 7 This is a cross-sectional view of the single-board detection and control device installed on the main busbar.

[0039] Figure 8 A three-dimensional structural diagram of a single-board detection and control device installed on a manifold.

[0040] Figure 9 A three-dimensional structural diagram of a single-board detection and control device, including a shut-off valve mechanism;

[0041] Figure 10 for Figure 9 A cross-sectional view of the structure installed on the manifold.

[0042] Figure 11 This is a three-dimensional structural diagram of a single-board detection and control device installed in series on a main busbar.

[0043] The diagram is labeled as follows: 1. Main manifold; 1-1. Clarified liquid channel; 1-2. Detection liquid channel; 2. Single-board detection and control device; 3. Valve island; 4. Inlet channel; 5. Clarified liquid channel; 6. Detection channel; 7. Turbidity sensor; 8. Switching valve mechanism; 8-1. Switching cylinder; 8-2. Switching piston; 8-3. Switching return spring; 8-4. Switching valve core; 8-5. Switching cylinder head; 9. Cut-off valve mechanism; 9-1. Cut-off cylinder; 9-2. 9-3. Cut-off piston, 9-4. Cut-off return spring, 9-5. Cut-off valve core, 9-6. Cut-off cylinder head, 10. Cylinder head, 11. Main pipe detection device, 12. Valve seat, 13. Flow passage, 14. Turbidity detector, 15. Channel switching mechanism, 15-1. Cylinder body, 15-2. Pneumatic piston, 15-3. Elastic return element, 15-4. Pneumatic valve core, 15-5. Pneumatic cylinder head, 16. Cylinder head, 17. Solenoid valve, 18. Air distribution pipe fittings. Detailed Implementation

[0044] Example 1

[0045] This embodiment provides a clarification and filtration control system for a filter press, such as... Figure 1 , 2As shown, it includes a manifold 1, which includes a clarified liquid channel 1-1 and a detection liquid channel 1-2. The clarified liquid channel 1-1 is used for the collection and output of clarified liquid during normal operation of the filter press, and the detection liquid channel 1-2 is used for the collection and output of filtrate during filter cloth damage detection. Additionally, a main pipe detection device 11 and a single-plate detection device 2 are fixed on the manifold 1. The main pipe detection device 11 is fixed at the outlet end of the clarified liquid channel 1-1 and communicates with it, used to detect the clarified filtrate in the clarified liquid channel 1-1. The single-plate detection device 2 is fixed above the inlet end of the manifold 1 and communicates with both the filter plate outlet of the filter press and the detection liquid channel 1-2. The single-plate detection device 2 is used to immediately switch the filtrate to the detection liquid channel 1-2 and automatically perform single-plate positioning detection when the main pipe detection device 11 detects turbidity. In this embodiment, the main pipe detection device 11 and the single plate detection and control device 2 work together to perform overall turbidity detection on the filtrate and position detection on the turbidity-laden filter plate in practical applications. This not only improves the timeliness and accuracy of turbidity detection, shortens the detection time and reduces the intensity of manual labor, but also facilitates the continuous control of material clarification and filtration.

[0046] It should be noted that this embodiment does not limit the structure of the main busbar 1, but it is preferred to adopt... Figure 1 The integrated tube shown is preferably an integrated structure in which the clarifying liquid channel 1-1 and the detection liquid channel 1-2 are simultaneously provided in the same structural component. However, a separate structure with two individual tubes or a combined structure with two individual tubes fixed together can also be used.

[0047] like Figure 5-8 As shown, the single-plate detection and control device 2 in this embodiment includes a valve island 3, which is generally a cuboid structure. In actual use, it can be fixed to the main manifold 1 by bolts or welding. The valve island 3 has at least one detection loop, each connected to a single filter plate for turbidity detection of the corresponding filter plate. Each detection loop includes a clarified liquid channel 5, a detection channel 6, and an inlet channel 4. The inlet channel 4 is connected to the filter plate outlet. The outlet ends of the clarified liquid channel 5 and the detection channel 6 are both located at the bottom of the valve island 3. The two ends of the clarified liquid channel 5 are connected to the inlet channel 4 and the clarified liquid channel 1-1, respectively. The two ends of the detection channel 6 are connected to the inlet channel 4 and the detection liquid channel 1-2, respectively. The detection channel 6 is equipped with a turbidity sensor 7 for detecting the turbidity of the incoming filtrate. When the turbidity sensor 7 detects that the turbidity of the filtrate reaches a set threshold, it determines that the filter cloth corresponding to the detection loop is damaged.

[0048] In addition, a switching valve mechanism 8 for switching the detection flow channel 6 and the clarifying liquid flow channel 5 is fixed on the upper part of the valve island 3. The number of switching valve mechanisms 8 is the same as the number of detection circuits and the two correspond one-to-one. Each set of switching valve mechanisms 8 is used to control the corresponding detection circuit to switch.

[0049] The aforementioned switching valve mechanism 8 has an initial state and a detection state. The initial state is the normal filtration state of the filter press, and the detection state is the controlled command detection state. In the initial state, the switching valve mechanism 8 controls the inlet channel 4 to connect with the clarified liquid channel 5. In the detection state, the switching valve mechanism 8 controls the inlet channel 4 to connect with the detection channel 6. The main pipe detection device 11 is used to detect the turbidity of the filtrate in the clarified liquid channel 1-1. When the main pipe detection device 11 detects that the turbidity of the filtrate in the clarified liquid channel 1-1 reaches the set value, the single-plate detection and control device 2 switches from the initial state to the detection state, and the turbidity sensor 7 detects the turbidity of the incoming filtrate.

[0050] Specifically, in the initial state, the switching valve mechanism 8 only controls the connection between the inlet channel 4 and the clarified liquid channel 5. At this time, the detection channel 6 is not connected to either the inlet channel 4 or the clarified liquid channel 5. The filtrate filtered by each filter plate on the filter press is output to the clarified liquid channel 1-1 through the corresponding clarified liquid channel 5. When the main pipe detection device 11 detects turbidity in the clarified liquid channel 1-1, the switching valve mechanism 8 switches from the initial state to the detection state. In the detection state, the switching valve mechanism 8 only controls the connection between the inlet channel 4 and the detection channel 6. At this time, the clarified liquid channel 5 is not connected to either the inlet channel 4 or the detection channel 6. The filtrate filtered by each filter plate on the filter press is output to the detection liquid channel 1-2 through the corresponding detection channel 6. Since the turbidity sensor 7 is located in the detection channel 6, when the turbidity sensor 7 detects that the turbidity of the filtrate reaches the set threshold, it can be determined that the filter cloth corresponding to the detection circuit is damaged.

[0051] Since each filter press has multiple filter plates, if the same number of detection circuits and switching valve mechanisms 8 as the number of filter plates are set on the same valve island 3, it will result in an excessively large single-plate detection and control device 2, making transportation and installation inconvenient. Therefore, to make the structure of the single-plate detection and control device 2 more reasonable, this embodiment preferably sets such as... Figure 5 The two detection loops and two sets of switching valve mechanisms 8 shown indicate that each single-plate detection and control device 2 can simultaneously detect two filter plates. Based on this, using a single-plate detection and control device 2 with half the number of filter plates can detect all filter plates. This not only reduces the size of the single-plate detection and control device 2 and the overall size of the system, but also facilitates equipment transportation and installation.

[0052] This embodiment does not limit the structure of the switching valve mechanism 8; it can use a pneumatic valve structure or an electromagnetic drive mechanism, or similar equivalent actuators, to perform the same action. Furthermore, when it is determined that the filtrate is completely free of contamination or when real-time monitoring is required to be extremely high, the turbidity sensor 7 can be moved to the middle of the inlet channel 4 for continuous monitoring. In this case, the monitoring responsiveness is maximized, but the maintenance cycle is minimized.

[0053] like Figure 3 , 4 As shown, the main pipe detection device 11 in this embodiment includes a valve seat 12, which is generally a cuboid structure. In actual use, it can be fixed to the outlet end of the main pipe 1 by bolts or welding. The valve seat 12 is provided with a filtrate inlet, a filtrate outlet, and a multi-channel detection unit. The filtrate inlet is connected to the clarified liquid channel 1-1 for introducing filtrate for real-time detection; the filtrate outlet is connected to the detection liquid channel 1-2 for discharging the detected filtrate. Each detection unit includes a flow channel 13, a channel switching mechanism 15, and a turbidity detector 14. The turbidity detector 14 is fixed in the flow channel 13 via the valve seat 12 for detecting the turbidity of the filtrate. Specifically, it is fixed in the flow channel 13 between the channel switching mechanism 15 and the filtrate outlet. The channel switching mechanism 15 is fixed on the valve seat 12 to control the opening and closing of the flow channel 13. The flow channel 13 of the multi-channel detection unit is connected in parallel between the filtrate inlet and the filtrate outlet. The channel switching mechanism 15 of the multi-channel detection unit can control the opening and closing of the corresponding flow channel 13 respectively. The multi-channel detection units cooperate to form a detection structure with one function and multiple functions.

[0054] The aforementioned one-to-many voting detection structure enables one-to-many voting detection. This one-to-many voting detection means that, under normal detection conditions, only one detection unit's flow channel 13 is connected to the filtrate inlet and outlet for detection, while the flow channels 13 of other detection units are cut off and not connected to the filtrate inlet and outlet. Only when the filtrate turbidity detected by the detection unit reaches the set value will the flow channels 13 of other detection units be connected simultaneously for detection. Finally, the initial detection results are judged by voting based on the detection results to determine whether turbidity has occurred and whether there is sensor failure.

[0055] The channel switching mechanism 15 in this embodiment includes a cylinder body 15-1, a cylinder head 16, a solenoid valve 17, and a pneumatically controlled valve core assembly. The solenoid valve 17, cylinder head 16, cylinder body 15-1, and pneumatically controlled valve core assembly are connected in series from top to bottom and fixed on the valve seat 12 to form the channel switching mechanism 15. The cylinder head 16 is fixed to the valve seat 12 by several long screws and presses the cylinder body 15-1 tightly. The cylinder head 16 is provided with air distribution holes corresponding to the cylinder body 15-1. The solenoid valve 17, cylinder head 16, cylinder body 15-1, pneumatically controlled valve core assembly, and valve seat 12 work together to complete the controlled switching valve function, thereby realizing the on / off control of the flow channel 13.

[0056] Specifically, the pneumatically controlled valve core assembly includes a pneumatically controlled piston 15-2, an elastic reset member 15-3, a pneumatically controlled valve core 15-4, and a pneumatically controlled cylinder head 15-5. The pneumatically controlled cylinder head 15-5 is fixed between the cylinder body 15-1 and the valve seat 12. The pneumatically controlled piston 15-2 is movably disposed within the cylinder body 15-1. The elastic reset member 15-3 is located between the pneumatically controlled piston 15-2 and the pneumatically controlled cylinder head 15-5. One end of the pneumatically controlled valve core 15-4 is fixed to the pneumatically controlled piston 15-2, and the other end passes through the elastic reset member 15-3 and the pneumatically controlled cylinder head 15-5 in sequence to control the opening and closing of the flow channel 13. In addition, each detection unit can be controlled by a solenoid valve 17 mounted upside down on the cylinder head 16 through a valve port.

[0057] In this embodiment, the preferred number of detection units is four. The four detection units can cooperate to form a detection structure with one-to-three voting. By adopting this detection structure with one-to-three voting, the accuracy of detection can be improved on the one hand, while avoiding excessive cost and overly complex structure. On the other hand, it can prevent the turbidity detector 14 from making false alarms due to scaling.

[0058] When the number of detection units is four or more, to make the structure of the main pipe detection device 11 more reasonable and concise, this embodiment preferably uses a shared cylinder head 16 for each detection unit in the main pipe detection device 11, which is equivalent to each detection unit using the same cylinder head 16 for air distribution. Simultaneously, each detection unit can be controlled in pairs by the same three-position five-way center-leakage solenoid valve 17 mounted upside down on the cylinder head 16 through the air distribution port. For example, if four detection units are provided, they can be divided into two groups, each controlled by a three-position five-way center-leakage solenoid valve 17 through the air distribution port. Correspondingly, when the number of solenoid valves 17 is greater than one, each solenoid valve 17 is preferably driven by the same power air pipe, i.e., the solenoid valves 17 are connected in series, which further simplifies the structure of the device. It should be noted that a distribution pipe 18 connected to the power air pipe is fixed on the solenoid valve 17, and the solenoid valve 17 can control the power gas from the distribution pipe 18 to enter and exit the corresponding channel switching mechanism 15 through the air distribution port.

[0059] In practical use, this embodiment employs a programmable PLC controller to achieve automatic control of the detection, thereby realizing automatic detection and damage location of turbidity. Specifically, the PLC controller can be connected to the turbidity detector 14, the turbidity sensor 7, the main pipe detection device 11, and the single-board detection and control device 2. When the turbidity detector 14 and the turbidity sensor 7 detect that the turbidity of the filtrate has reached a set value and indicates turbidity, it automatically controls the main pipe detection device 11 and the single-board detection and control device 2 to operate and issue an alarm, thereby achieving automatic detection of the system. It should also be noted that the turbidity detector 14 and the turbidity sensor 7 in this embodiment can be the same product; the two names are used in this embodiment mainly for ease of distinction.

[0060] The implementation principle of this embodiment is as follows:

[0061] For the main pipe detection device 11: four detection units are set as the first detection unit, the second detection unit, the third detection unit, and the fourth detection unit, respectively. Their flow channels 13 are the first flow channel 13, the second flow channel 13, the third flow channel 13, and the fourth flow channel 13, respectively. Under normal circumstances, only the first flow channel 13 of the first detection unit is connected to the filtrate inlet and the filtrate outlet. At this time, the turbidity detector 14 in the first flow channel 13 continuously detects the incoming filtrate. As the detection proceeds, the turbidity detector 14 on the first flow channel 13 will continuously approach the set value due to turbidity or continuous scaling. However, the change in turbidity value does not necessarily mean that the filtration system has become turbid. At this time, the second flow channel 13, the third flow channel 13, and the fourth flow channel 13 will be opened to make a voting judgment on the first flow channel 13.

[0062] When the values ​​of the turbidity detectors 14 in the other three flow channels 13 rise consistently and are close to or exceed the turbidity set value, turbidity is detected, a turbidity signal is issued, and it is determined that the turbidity detectors 14 in the first flow channel 13 are working well. Then, based on the average values ​​detected by the second, third, and fourth flow channels 13, the first flow channel 13 is offset to zero and restored to normal detection status.

[0063] When the values ​​of the turbidity detectors 14 in the other three flow channels 13 are consistent and close to the set clarification threshold, it is determined that the turbidity detectors 14 in the first flow channel 13 are scaled and contaminated, and they are re-calibrated to zero as the clarification threshold, and the offset value from the zero calibration is recorded.

[0064] When a two-to-one vote occurs, it is determined that the turbidity detector 14 is malfunctioning or that the scale buildup in the turbidity detector 14 in the first flow channel 13 has reached the offset correction limit, requiring immediate manual intervention and repair.

[0065] For the single-plate detection and control device 2: In the initial state, the switching valve mechanism 8 only controls the connection between the inlet channel 4 and the clarified liquid channel 5. At this time, the filtrate from each filter plate on the filter press enters the clarified liquid channel 1-1 of the manifold 1 through the corresponding clarified liquid channel 5. When the manifold detection device 11 detects that the filter press filtrate is turbid, all the switching valve mechanisms 8 are controlled to switch from the initial state to the detection state. At this time, the filtrate from each filter plate on the filter press enters the detection liquid channel 1-2 of the manifold 1 through the corresponding detection channel 6. In this state, the turbidity sensor 7 in the detection channel 6 detects the filtrate. When the turbidity sensor 7 detects that the turbidity of the filtrate reaches the set threshold, it can be determined that the filter cloth of the corresponding detection circuit is damaged.

[0066] It should be noted that the switching valve mechanism 8 in this embodiment only has two states: initial state and detection state. In practical applications, when filter cloth turbidity occurs, the switching valve mechanism 8 will remain in the detection state to ensure that the corresponding turbid liquid enters the detection liquid channel 1-2 instead of entering the clarified liquid channel 1-1 and contaminating the clarified filtrate. After a damaged filter plate is detected, the corresponding switching valve mechanism 8 can continue to remain in the detection state, and the turbid filtrate will be discharged through the detection flow channel 6 into the detection liquid channel 1-2. Meanwhile, the switching valve mechanisms 8 for other normal filter plates can switch back to the initial state for normal pressure filtration without affecting the normal operation of the pressure filtration process.

[0067] Example 2

[0068] This embodiment further defines the structure of the switching valve mechanism 8 based on Embodiment 1. For example... Figure 5-8 As shown, the switching valve mechanism 8 includes a switching cylinder 8-1, a switching cylinder head, a solenoid valve 17, and a pneumatic switching valve core assembly. The solenoid valve 17, the switching cylinder head, the switching cylinder 8-1, and the pneumatic switching valve core assembly are connected in series from top to bottom on the valve island 3 to form the switching valve mechanism 8. The switching cylinder head is fixed to the valve island 3 by long screws and presses the switching cylinder 8-1 firmly. The switching cylinder head has air distribution holes corresponding to the switching cylinder 8-1. The solenoid valve 17, the switching cylinder head, the switching cylinder 8-1, the pneumatic switching valve core assembly, and the valve island 3 work together to complete the controlled switching valve function.

[0069] Specifically, the pneumatic switching valve core assembly includes a switching piston 8-2, a switching reset spring 8-3, a switching valve core 8-4, and a switching cylinder head 8-5. The switching cylinder head 8-5 is fixed between the switching cylinder barrel 8-1 and the valve island 3. The switching piston 8-2 is movably disposed inside the switching cylinder barrel 8-1. The switching reset spring 8-3 is located between the switching piston 8-2 and the switching cylinder head 8-5. One end of the switching valve core 8-4 is fixed on the switching piston 8-2, and the other end passes through the switching spring and the switching cylinder head 8-5 in sequence to switch between the initial state and the detection state.

[0070] In addition, the switching cylinder head 8-5 is equipped with detection switching channels that communicate with the clarified liquid flow channel 5 and the detection flow channel 6 respectively, such as... Figure 6 , 7 As shown, the initial state is when the switching valve core 8-4 is on top, and the detection state is when the switching valve core 8-4 is on the bottom under control.

[0071] It should be noted that the solenoid valve 17 is mounted upside down on the switching cylinder head. A distribution pipe 18 connected to the power air pipe is fixed to the solenoid valve 17. The solenoid valve 17 can control the power gas from the distribution pipe 18 to enter and exit the corresponding switching valve mechanism 8 through the distribution port, thereby completing the combined normal operation, controlled detection, and controlled switching flow path actions. Furthermore, when there are two or more sets of switching valve mechanisms 8 on the valve island 3, these switching valve mechanisms 8 can share the same switching cylinder head for gas distribution. Accordingly, each solenoid valve 17 is preferably driven by the same power air pipe, i.e., each solenoid valve 17 is connected in series, which further simplifies the structure of the device.

[0072] Example 3

[0073] This embodiment further defines the structure of the single-board inspection and control device 2 based on embodiment 1 or 2. For example... Figure 9-11 As shown, the single-board detection and control device 2 also includes a shut-off valve mechanism 9 fixed on the valve island 3 for cutting off the liquid inlet channel 4. The number of shut-off valve mechanisms 9 is the same as the number of detection circuits and the same as the number of switching valve mechanisms 8. Each shut-off valve mechanism 9 has a normally open state and a shut-off state, and can be switched between the normally open state and the shut-off state accordingly. The shut-off state is used to cut off the liquid inlet channel 4 after the filter cloth is found to be turbid.

[0074] The shut-off valve mechanism 9 in this embodiment includes a shut-off cylinder 9-1, a shut-off cylinder head, a solenoid valve 17, and a pneumatic shut-off valve core assembly. The solenoid valve 17, the shut-off cylinder head, the switching cylinder 8-1, and the pneumatic shut-off valve core assembly are connected in series from top to bottom on the valve island 3 to form the shut-off valve mechanism 9. The shut-off cylinder head is provided with an air distribution hole corresponding to the shut-off cylinder 9-1. The solenoid valve 17, the shut-off cylinder head, the shut-off cylinder 9-1, the pneumatic shut-off valve core assembly, and the valve island 3 work together to complete the controlled shut-off valve function.

[0075] Specifically, the pneumatic shut-off valve core assembly includes a shut-off piston 9-2, a shut-off return spring 9-3, a shut-off valve core 9-4, and a shut-off cylinder head 9-5. The shut-off cylinder head 9-5 is fixed between the shut-off cylinder barrel 9-1 and the valve island 3. The shut-off piston 9-2 is movably disposed inside the shut-off cylinder barrel 9-1. The shut-off return spring 9-3 is located between the piston and the shut-off cylinder head 9-5. One end of the shut-off valve core 9-4 is fixed on the shut-off piston 9-2, and the other end passes through the shut-off spring and the shut-off cylinder head 9-5 in sequence to switch between the normally open state and the shut-off state.

[0076] To further simplify the structure of the control device 2, this embodiment uses a shared distribution cylinder head 10 for the switching cylinder head and the cutting-off cylinder head. This distribution cylinder head 10 is fixed to the valve island 3 by several long screws, which press and fix the switching cylinder 8-1 and the cutting-off cylinder 9-1. This is equivalent to using a single distribution cylinder head 10 to replace both the switching and cutting-off cylinder heads. Simultaneously, the switching valve mechanism 8 and the cutting-off valve mechanism 9 are controlled by the same three-position five-way solenoid valve 17, which is mounted upside down on the distribution cylinder head 10, through the air distribution port. Furthermore, when there are two or more sets of switching valve mechanisms 8 and cutting-off valve mechanisms 9 on the same valve island 3, each solenoid valve 17 is mounted upside down and driven by the same power pipe, further simplifying the structure of the control device.

[0077] In this embodiment, when filter plate or filter cloth damage and turbidity are detected, the shut-off valve mechanism 9 can be driven to cut off the inlet flow channel 4 according to the preset processing method, causing the corresponding filter plate to stop filtration. Alternatively, continuous filtration can be selected. In this case, the corresponding switching valve mechanism 8 remains in the detection state, while other undamaged switching valve mechanisms 8 switch to their initial state, allowing the turbid filtrate to enter the detection flow channel 6 without further contaminating other clarified liquid channels 1-1. Based on this, the present invention can automatically, quickly, and accurately locate the turbid filter plate and take timely corresponding actions, improving the timeliness and accuracy of clarification filtration detection and control, enhancing the overall efficiency of the device, ensuring the long-term reliability of the filter press, and optimizing the arrangement of subsequent processing work.

[0078] The above description is merely a specific embodiment of the present invention. Any feature disclosed in this specification may be replaced by other equivalent or similar features unless otherwise specified. All features or steps in the disclosed methods or processes may be combined in any way, except for mutually exclusive features and / or steps.

Claims

1. A clarifying filtration monitoring system for filter presses, characterized by: The application relates to a filter plate detection device, which comprises a manifold (1) comprising a clarified liquid channel (1-1) and a detection liquid channel (1-2), wherein a manifold detection device (11) and a single-plate detection control device (2) are fixed on the manifold (1), the single-plate detection control device (2) comprises a valve island (3) fixed on the manifold (1), at least one detection loop is arranged in the valve island (3), each detection loop comprises a clarified liquid flow channel (5), a detection flow channel (6) and a liquid inlet flow channel (4) connected with a filter plate, the two ends of the clarified liquid flow channel (5) are communicated with the liquid inlet flow channel (4) and the clarified liquid channel (1-1) respectively, the two ends of the detection flow channel (6) are communicated with the liquid inlet flow channel (4) and the detection liquid channel (1-2) respectively, and a turbidity sensor (7) is arranged in the detection flow channel (6); a switching valve mechanism (8) for switching the detection flow channel (6) and the clarified liquid flow channel (5) is fixed on the valve island (3), the switching valve mechanism (8) has an initial state and a detection state, in the initial state, the switching valve mechanism (8) controls the liquid inlet flow channel (4) to be communicated with the clarified liquid flow channel (5), and in the detection state, the switching valve mechanism (8) controls the liquid inlet flow channel (4) to be communicated with the detection flow channel (6); the manifold detection device (11) is used for detecting the filtrate turbidity of the clarified liquid channel (1-1), and the single-plate detection control device (2) is switched from the initial state to the detection state when the manifold detection device (11) detects that the filtrate turbidity in the clarified liquid channel (1-1) reaches a set value.

2. A clarification filtration control system for filter presses according to claim 1, characterized in that: The manifold detection device (11) comprises a valve seat (12), the valve seat (12) is provided with a filtrate inlet, a filtrate outlet and a plurality of detection units, the filtrate inlet is communicated with the clarified liquid channel (1-1), each detection unit comprises a flow channel (13), a channel switching mechanism (15) and a turbidity detector (14), the turbidity detector (14) is fixed in the flow channel (13) through the valve seat (12) and is used for detecting the filtrate turbidity, the channel switching mechanism (15) is fixed on the valve seat (12) and is used for controlling the opening and closing of the flow channel (13), and the flow channels (13) of the plurality of detection units are connected in parallel between the filtrate inlet and the filtrate outlet, and the plurality of detection units form a one-to-three voting detection structure.

3. A clarification filter control system for a filter press according to claim 2, characterized in that: The number of the detection units is four, and the four detection units form a one-to-three voting detection structure.

4. The clarification filter control system for filter press according to claim 2, characterized in that: The channel switching mechanism (15) comprises a cylinder barrel (15-1), a cylinder cover (16) and a pneumatic valve core assembly, the cylinder cover (16), the cylinder barrel (15-1) and the pneumatic valve core assembly are fixed in series from top to bottom on the valve seat (12) to form the channel switching mechanism (15), the cylinder barrel (15-1) is tightly fixed by the cylinder cover (16) through a plurality of long screws fixed on the valve seat (12), and the cylinder cover (16) is provided with a gas distribution hole corresponding to the cylinder barrel (15-1).

5. A clarification filter control system for filter presses as claimed in claim 3, characterized in that: The cylinder cover (16) is shared by the detection units in the manifold detection device (11), each two detection units form a group and are controlled by a three-position five-way reverse-mounted electromagnetic valve (17) on the cylinder cover (16) through the gas distribution hole, and the electromagnetic valves (17) are driven by the same power gas pipe.

6. A clarification filtration control system for filter presses according to any one of claims 1-5, characterized in that: The single plate accuse device (2) further comprises a cut-off valve mechanism (9) fixed on the valve island (3) for cutting off the liquid inlet channel (4), the cut-off valve mechanism (9) has a normally open state and a cut-off state, and the cut-off state is used for cutting off the liquid inlet channel (4) after the filter cloth is found to be muddy.

7. A clarification filter control system for a filter press according to claim 6, characterized in that: The switching valve mechanism (8) comprises a switching cylinder barrel (8-1), a switching cylinder head and a pneumatic switching valve core assembly, the switching cylinder head, the switching cylinder barrel (8-1) and the pneumatic switching valve core assembly are fixed in series from top to bottom on the valve island (3) to form the switching valve mechanism (8), and the switching cylinder head is provided with a gas distribution hole corresponding to the switching cylinder barrel (8-1).

8. A clarification filtration control system for filter presses according to claim 7, characterized in that: The cut-off valve mechanism (9) comprises a cut-off cylinder barrel (9-1), a cut-off cylinder head and a pneumatic cut-off valve core assembly, the cut-off cylinder head, the switching cylinder barrel (8-1) and the pneumatic cut-off valve core assembly are fixed in series from top to bottom on the valve island (3) to form the cut-off valve mechanism (9), and the cut-off cylinder head is provided with a gas distribution hole corresponding to the cut-off cylinder barrel (9-1).

9. A clarification filtration control system for a filter press according to claim 8, characterized in that: The switching cylinder head and the cut-off cylinder head share a gas distribution cylinder head (10), the gas distribution cylinder head (10) is used for pressing and fixing the switching cylinder barrel (8-1) and the cut-off cylinder barrel (9-1) by a plurality of long screws fixed on the valve island (3), and the switching valve mechanism (8) and the cut-off valve mechanism (9) are controlled by the three-position five-way back-mounted electromagnetic valve (17) on the gas distribution cylinder head (10) through the gas distribution hole.

10. The clarification filtration system for filter press according to claim 9, characterized in that: The number of the switching valve mechanism (8) and the number of the cut-off valve mechanism (9) are the same as the number of the detection circuit, when the number of the switching valve mechanism (8) and the number of the cut-off valve mechanism (9) are greater than one set, the electromagnetic valve (17) is back-mounted and driven by the same power gas pipe.

Images