CN112121480A

CN112121480A - Method and system for automatically controlling synchronous action of filter plates of filter press

Info

Publication number: CN112121480A
Application number: CN202011060873.3A
Authority: CN
Inventors: 王媚; 陈传好
Original assignee: Zhuzhou Times New Material Technology Co Ltd
Current assignee: Zhuzhou Times New Material Technology Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2020-12-25
Anticipated expiration: 2040-09-30
Also published as: CN112121480B

Abstract

The invention provides a method and a system for automatically controlling synchronous actions of filter plates of a filter press, which are characterized in that when a filter press is identified to have a plate closing/plate opening action instruction, pressure data on two sides of a filter plate suspension rod and state data of limit switches on two sides of the filter plate are collected, an oil pump of a filter press system and related valves of a plate closing/plate opening are controlled to operate according to a real-time plate closing pressure monitoring value and a pressing pressure monitoring value, and a plurality of filter plates of the filter press are automatically controlled to synchronously realize plate opening according to a set plate closing/plate opening requirement. This scheme of adoption can realize each filter plate plywood and the automatic synchronization control who opens the board operation in-process of pressure filter, and the operation data of diversified each structure of gathering is as real time control's foundation, just can in time respond when having trouble hidden danger or just having just broken down, guarantees troubleshooting efficiency, and avoids the time and materials loss of fault propagation, has promoted the intelligence of many filter plate synchronization control of pressure filter.

Description

Method and system for automatically controlling synchronous action of filter plates of filter press

Technical Field

The invention relates to the technical field of operation and maintenance of filter presses, in particular to a method and a system for automatically controlling synchronous action of filter plates of a filter press.

Background

The filter press is used as filter press equipment widely applied to the fields of petroleum, chemical industry, pharmacy, sugar manufacturing, coal washing, grease, printing and dyeing, brewing, ceramics, mine metallurgy, sludge treatment and the like, and has the advantages of complex mechanical structure, low automation degree and high failure rate; the filter press is a plate frame filter press, a box filter press or a diaphragm filter press, which all operate in a sequencing batch mode, the main actions of the filter press body are plate combination, plate opening, plate closing, plate opening, material unloading, cleaning and the like besides the filter press for completing solid-liquid separation, and the filter plate has the highest moving frequency in the whole process, so the faults caused by the filter plate are the most.

The common filter plate control method of the filter press is an open-loop control method, and under the control mode, a PLC cannot obtain the real-time state of each control point, so that once deviation occurs, even if the abnormality is determined, the abnormality cannot be corrected in time in the running process of the system, and faults caused by accumulated deviation are inevitable. The filter press is provided with kinetic energy by the hydraulic station, the oil cylinder rod pulls the filter plate to do corresponding push-pull movement, the filter plate cannot be pushed in parallel due to uneven stress in the push-pull process, the PLC which is not fed back still sends an instruction to the hydraulic station, and the filter plate is damaged due to the forced pressurization. The prior art also provides a device for controlling the filter plates of the high-efficiency filter press to be pulled open in groups, which cannot plan the synchronous action of all the filter plates. Therefore, it is desirable to provide a technique for reasonably controlling the synchronous operation of the filter plates of a filter press.

Disclosure of Invention

To solve the above problems, the present invention provides a method for automatically controlling the synchronous action of filter plates of a filter press, which comprises the following steps:

identifying operating instructions of the filter press;

when the filter press has a plate closing/opening action instruction, pressure data at two sides of a suspension rod of a filter plate of the filter press and state data of limit switches at two sides of the filter plate are collected,

the pressure data at two sides of a filter press filter plate suspension rod is used as a basis to combine a real-time plywood pressure monitoring value and a pressing pressure monitoring value to control an oil pump of a filter press system and related valves of plywood to operate, the pressure data at two sides of the filter press filter plate suspension rod and limit switch state data at two sides of the filter plate are used as a basis to combine the real-time plywood pressure monitoring value and the pressing pressure monitoring value to control the oil pump of the filter press system and related valves of open plates to operate, and a plurality of filter plates of the filter press are automatically controlled to synchronously realize the action of open plates according to the set plywood/open plate requirements;

wherein, the relevant valve of plywood includes: relief valve, closing plate valve, overflow valve and opening plate valve, the relevant valve of opening the board includes: pressure relief valve, closing plate valve, overflow valve, opening plate valve and relief valve.

Preferably, in one embodiment, when the filter press has plywood requirements, the control is performed by:

step A1, controlling an oil pump, an overflow valve and a plywood valve of the filter pressing system to open, and controlling a filter plate to start to execute plywood action;

step A2, respectively judging whether the real-time axial force monitoring values of the left side and the right side of a filter plate suspension rod meet first plywood permission conditions, if not, controlling an overflow valve to be closed, a plywood valve to be closed and a pressure relief valve to be opened, controlling related valves to operate according to the real-time plywood pressure monitoring values of the filter plates, the laminating pressure monitoring values and the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod to realize plywood adjustment until the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod of the filter press meet the first plywood permission conditions, and entering step A3;

step A3, when the pressure monitoring value of the pressure filter meets the second plywood permission condition, controlling the overflow valve to close and the pressure relief valve to open;

step A4, when the press fit pressure monitoring value of the press filter meets the third plywood permission condition, controlling the pressure release valve to close, the plywood valve to close and the oil pump to close, and completing the plywood action of the press filter;

when the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod are smaller than or equal to a set value, the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod are judged to meet the first plywood permission condition, otherwise, the real-time axial force monitoring values are not met.

Further, in one embodiment, in the step a1, the method further includes:

and after the oil pump, the overflow valve and the plywood valve are opened, counting the operating times of the plywood, judging whether the accumulated times of the plywood reaches a set time threshold value, and if so, giving an alarm.

In one embodiment, in step a2, after determining whether the real-time axial force monitoring values on the left and right sides of the filter plate suspension rod both satisfy the first engaging plate allowance condition, if not, controlling the filter plate to perform immediate adjustment according to the following operations:

for the filter plates which do not meet the requirement that the axial force monitoring values are all smaller than or equal to the set value, the filter plates are controlled to perform reverse movement of the plywood to the set position, then perform forward movement of the plywood, if the filter plates still have the axial force monitoring values of the filter plate suspension rods which do not meet the allowance condition of the first plywood after the filter plates are repeated to the set times, the next operation is performed, and the operation of related valves is controlled to realize plywood adjustment;

and if the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod within the set times meet the first plate allowable condition, executing the step A3.

Specifically, in one embodiment, in step a2, the process of controlling the operation of the associated valve to achieve the plywood adjustment includes the following operations:

when the real-time pressing pressure monitoring value of the filter press meets the pressure relief pressure set value or less, controlling the pressure relief valve to be closed, the overflow valve to be opened and the plate opening valve to be opened;

judging whether a monitoring value exceeding the axial force set value of the filter plate suspension rod exists in the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod, and if so, controlling the filter plate

Alarming, if the alarm does not exist, controlling the overflow valve to be closed and the pressure relief valve to be opened;

and when the real-time pressing pressure monitoring value of the filter press meets the pressure relief pressure set value or less, controlling the pressure relief valve and the plate opening valve to be closed, opening the overflow valve and the plate closing valve, and executing the step A2 again.

Preferably, in one embodiment, when the filter press has an open plate requirement, the control is performed by:

step B1, controlling the pressure relief valve to open, and starting the plate opening action by the filter plate;

step B2, when the monitoring value of the pressing pressure meets the first opening plate allowance condition, controlling an oil pump, an overflow valve and an opening plate valve of the filter pressing system to open;

step B3, judging whether the real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod meet a second plate opening allowance condition, if not, controlling an overflow valve to be closed, a plate opening valve to be closed, a pressure relief valve to be opened, controlling related valves to operate according to the pressing pressure monitoring values of the filter plates and the real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod to realize plate opening adjustment until the real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod of the filter press meet the second plate opening allowance condition, and entering step B4;

step B4, when the opening states of the two sides of the filter plate reach the set position within the set time, controlling the oil pump and the overflow valve to be closed, and opening the pressure relief valve;

step B5, when the press fit pressure monitoring value meets the third plate opening allowance condition, controlling the pressure relief valve and the plate opening valve to close to complete the plate opening action of the filter press;

and when the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod are determined to be less than or equal to a set value, determining that the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod both meet a second plate opening permission condition, otherwise, determining that the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod do not.

In one embodiment, in the step B3, the process of controlling the operation of the relevant valve to realize the opening adjustment includes the following operations:

when the press-fit pressure monitoring value meets the set pressure relief value, controlling the pressure relief valve to be closed, and controlling the overflow valve and the plywood valve to be opened;

judging whether a value exceeding a set value of the axial force of the filter plate suspension rod exists in real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod shaft, if so, giving an alarm, otherwise, controlling an overflow valve to be closed and a pressure relief valve to be opened when a press fit pressure monitoring value meets the set value of the pressure of a plywood or more;

and when the press fit pressure monitoring value meets the pressure relief pressure set value or less, controlling the pressure relief valve and the plate closing valve to be closed, and controlling the overflow valve and the plate opening valve to be opened, and executing the step B3 again.

Further, in one embodiment, in step B2, the method further includes:

and after the oil pump, the overflow valve and the plate opening valve are opened, counting the running times of the plate opening, judging whether the accumulated plate opening times reach a set time threshold value, and if so, alarming.

In one embodiment, when an alarm is given, the following steps are executed: controlling the filter press to pause, outputting an alarm prompt signal corresponding to the fault data, and reminding workers to intervene to remove the fault; wherein the fault data includes information on the faulty component and the operating status of the current filter press.

In accordance with still further aspects of any one or more of the above embodiments, the present invention also provides a system for automatically controlling the synchronization of filter plates in a filter press, the system performing the method of any one or more of the above embodiments.

Compared with the closest prior art, the invention also has the following beneficial effects:

the invention provides a method and a system for automatically controlling synchronous action of filter plates of a filter press, wherein the method comprises the following steps: identifying an operation instruction of the filter press, determining that the opening-closing plate synchronous action of the filter press is performed on the premise of having the action instruction on the basis of the step, and having the action instruction means that the filter press system and the filter press meet the self-checking requirement of performing the opening-closing plate, avoiding the influence on the effective execution of the opening-closing plate action due to the existing valve and equipment problems of the filter press system and the filter press, and controlling the fault probability to a certain extent, further, controlling the synchronous opening-closing plate action of the filter plates on the basis of real-time monitoring parameters such as real-time axial force monitoring values on two sides of a filter plate suspension rod of the filter press, limit switch state data on two sides of the filter plate, plate pressure monitoring values, pressing pressure monitoring values and the like according to a process control strategy, adjusting the operation of the opening-closing action of the filter plates on the basis of, and the fault can be timely found when the fault hidden trouble exists or the fault just occurs, the best opportunity for solving the fault is strived for the working personnel, and meanwhile, the prompt information is timely issued to the PLC, so that the condition that the fault is seriously developed due to the originally tiny abnormal accident is avoided, and the time and the cost for processing the fault can be greatly reduced.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic flow chart of a method for automatically controlling the synchronous operation of filter plates of a filter press according to an embodiment of the present invention;

FIG. 2 is a flowchart of a plywood synchronous control process of the method for automatically controlling the synchronous action of the filter plates of the filter press according to the embodiment of the invention;

FIG. 3 is a flowchart illustrating the opening synchronization control process of the method for automatically controlling the synchronous operation of the filter plates of the filter press according to the embodiment of the present invention;

fig. 4 is a schematic structural diagram of a system for automatically controlling the synchronous operation of filter plates of a filter press according to another embodiment of the present invention.

Detailed Description

The following detailed description will be provided for the embodiments of the present invention with reference to the accompanying drawings and examples, so that the practitioner of the present invention can fully understand how to apply the technical means to solve the technical problems, achieve the technical effects, and implement the present invention according to the implementation procedures. It should be noted that, unless otherwise conflicting, the embodiments and features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are all within the scope of the present invention.

As a widely used filter press apparatus, a filter press is generally composed of: the frame part, the hydraulic part, the filter plate and filter cloth part and the electric control system. But because the device belongs to a traditional device, the automation degree is low in the operation process, the failure rate is high, and the use requirement of modern industry on the device is difficult to meet.

The common filter plate control method of the filter press is an open-loop control method, and under the control mode, a PLC cannot obtain the real-time state of each control point, so that once deviation occurs, even if the abnormality is determined, the abnormality cannot be corrected in time in the running process of the system, and faults caused by accumulated deviation are inevitable. The filter press is provided with kinetic energy by the hydraulic station, the oil cylinder rod pulls the filter plate to do corresponding push-pull movement, the filter plate cannot be pushed in parallel due to uneven stress in the push-pull process, the PLC which is not fed back still sends an instruction to the hydraulic station, and the filter plate is damaged due to the forced pressurization. The prior art also provides a device for controlling the filter plates of the high-efficiency filter press to be pulled open in groups, which cannot plan the synchronous action of all the filter plates. Therefore, it is desirable to provide a technique for reasonably and automatically controlling the synchronous operation of the filter plates of the filter press.

Process control is an automatic control system that allows the parameters characterizing a production process to be controlled quantities, either close to a set value or within a set range. The term "production process" as used herein refers to the interaction and conversion of matter and energy in a production plant or apparatus. The main parameters characterizing the process are temperature, pressure, flow, level, composition, concentration, etc.

By controlling the process parameters, the yield of the product in the production process can be increased, the quality can be improved, and the energy consumption can be reduced. Process control systems typically take the form of feedback control, which is the primary means of process control. In practical application, a sensor acquires parameters of the controlled equipment in the operation process, a set controller adjusts the parameters according to the acquisition result of the sensor, the values of the parameters meet a desired value (set value) and can be one or more specified values or specified ranges, and then the adjusted parameters are input to the controlled equipment through an actuator to serve as control parameters of the controlled equipment in operation. The control mode is applied to an automatic control mechanism of a filter press.

Specifically, aiming at the filter press equipment, in order to improve the automation degree and the stable operation capability of the equipment, an automatic control technology is particularly applied to the technical bottleneck of synchronous action of filter plates of the filter press, the invention is based on a process control technology and combines the achievement of the modern automation technology to convert the movement action of the filter plates of the filter press into a control method for synchronous action of the filter plates of the filter press, which is synchronous and controllable, can be realized and has good self-adaptive effect.

Example one

Fig. 1 is a schematic flow chart illustrating a method for automatically controlling the synchronous operation of filter plates of a filter press according to an embodiment of the present invention, and as can be seen from fig. 1, the method includes the following steps:

and S110, identifying an operation instruction of the filter press. In this step, in order to determine whether the current filter press has a control command for executing an action and specifically what action process needs to be automatically executed, after the action to be executed is identified and determined to be a plywood process, the method or step in S120 is further executed.

By the operation, the opening-closing plate synchronous action of the filter press can be ensured to be carried out on the premise of having an action command, and the corresponding opening-closing plate action command indicates that each valve and structure of the current filter press system and the filter press meet the self-checking requirement of directly executing the opening-closing plate action, in practical application, the self-checking process before the opening-closing plate action can be automatically controlled and completed based on a set strategy, and in one embodiment, the automatic protection process of the opening-closing plate before the filter press action can be automatically realized by adopting the following technical steps:

step one, identifying the operation requirement of the filter press;

secondly, when the filter press has plate combination/plate opening requirements, controlling an oil pump of a filter press system and related valves of a plate combination/plate opening to operate based on a real-time filter plate suspension rod axial force monitoring value, a plate combination pressure monitoring value and a pressing pressure monitoring value of the filter press so that the filter press meets the set plate combination/plate opening conditions to realize the operation of plate combination of the filter press; wherein, the relevant valve of plywood/division board includes: pressure relief valve, closing plate valve, overflow valve, opening plate valve and relief valve.

Specifically, when the filter press has plywood requirements, the control is carried out by the following steps:

step a1, controlling an oil pump, an overflow valve and a plywood valve of the filter pressing system to open;

step a2, judging whether the current axial force monitoring value of the filter plate suspension rod meets the first plywood allowable condition, if not, controlling an overflow valve to be closed, closing a plywood valve, opening a pressure relief valve, controlling related valves to operate according to a real-time plywood pressure monitoring value, the axial force monitoring value of the filter plate suspension rod and a pressing pressure monitoring value to realize plywood adjustment, and entering the step a3 until the axial force monitoring value of the filter plate suspension rod of the filter press meets the first plywood allowable condition;

step a4, when the press fit pressure monitoring value of the press filter meets the third plywood permission condition, controlling the pressure relief valve to be closed, the plywood valve to be closed and the oil pump to be closed, and realizing plywood operation of the press filter.

Further, in the step a1, the method further includes: after the oil pump, the overflow valve and the plywood valve are opened, calculating the operation times of plywood, judging whether the accumulated times of plywood reaches a set time threshold value, and if so, giving an alarm; if not, the accumulated times of the operation of the plywood does not exceed the set times and is within the acceptable range, and the synchronous control flow of the plywood is continuously executed.

Wherein, the step a2 is a process of adjusting plywood by controlling the operation of the relevant valves through the following operations:

when the real-time plywood pressure monitoring value of the filter press meets the pressure relief pressure set value or less, the pressure relief valve and the plywood valve are controlled to be closed, and the overflow valve and the plywood opening valve are controlled to be opened;

judging whether the real-time monitoring value of the axial force of the filter plate suspension rod exceeds the set value of the axial force of the filter plate suspension rod, if so, giving an alarm, otherwise, controlling an overflow valve to be closed and a pressure relief valve to be opened;

Accordingly, when the filter press has an open plate requirement, the control is carried out by the following steps:

b1, controlling the pressure relief valve to be opened, monitoring the state of the pressure relief valve in real time, controlling the pressure relief valve to be opened when the state of the pressure relief valve reaches a set position within set time, and otherwise, alarming;

step b2, when the pressure monitoring value meets the first opening plate allowance condition, controlling an oil pump, an overflow valve and an opening plate valve of the filter pressing system to open;

b3, judging whether the axial force monitoring value of the filter plate suspension rod meets a second plate opening allowance condition, if not, controlling the overflow valve to be closed, closing the plate opening valve, opening the pressure relief valve, controlling the relevant valves to operate according to the real-time axial force monitoring value of the filter plate suspension rod and the pressing pressure monitoring value to realize plate opening adjustment until the axial force monitoring value of the filter plate suspension rod of the filter press meets the second plate opening allowance condition, and entering the step b 4;

step b4, when the plate opening state reaches the set position, controlling the oil pump and the overflow valve of the oil overflow pump to close, and opening the pressure relief valve;

and b5, controlling the pressure relief valve and the plate opening valve to be closed when the press fit pressure monitoring value meets the third plate opening allowance condition, and realizing the plate opening operation of the filter press.

Further, in the step b3, the process of controlling the operation of the relevant valve to realize the opening adjustment includes the following operations:

when the press-fit pressure monitoring value meets the set pressure relief value, controlling the pressure relief valve and the plate opening valve to close, and controlling the overflow valve and the plate opening valve to open;

judging whether the monitoring value of the axial force of the filter plate suspension rod exceeds a set value and exceeds the set value of the axial force of the filter plate suspension rod, if so, giving an alarm, otherwise, controlling an overflow valve to be closed and a pressure relief valve to be opened when the pressure monitoring value of the pressed plywood meets the set value of the plywood pressure or less;

Similarly, step b2 also includes: after an oil pump, an overflow valve and a plate opening valve are opened, calculating the plate opening operation times, judging whether the accumulated plate opening times reach a set time threshold value, and if so, alarming; if not, the accumulated times of the board opening operation does not exceed the set times and is within the acceptable range, and the board opening synchronous control process is continuously executed.

By adopting the technical scheme of the embodiment, the filter press is subjected to full-automatic protection control before the opening plate action is executed, so that the states of all equipment or structures related to the filter press in the opening plate process are detected, monitored and protected by the automatic control system, the influence on the effective execution of the opening plate action caused by the existing valve and equipment problems of the filter press system and the filter press can be avoided, the fault probability is controlled to a certain degree, and the time for prompting the fault and processing the fault and the consumption of manpower and material resources are saved.

After the filter press system and the valves and structures of the filter press meet the self-inspection requirement of the opening plate, the filter press can have the action instruction of the opening plate, and the next step S120 is executed to control the filter press to automatically realize the synchronous action of the opening plate. The embodiment of the invention comprises step S120, when the filter press has a plate closing/opening action instruction, collecting pressure data at two sides of a suspension rod of the filter plate of the filter press and state data of limit switches at two sides of the filter plate,

Specifically, fig. 2 is a flowchart illustrating a plywood synchronous control process of the method for automatically controlling the synchronous action of the filter plates of the filter press according to the embodiment of the invention, wherein when the filter press performs the plywood action, the completion of the plywood state depends on whether the pressing pressure of the filter press reaches a set value; thus, as shown in FIG. 2, in one embodiment, when the filter press has plywood requirements, synchronization control is achieved by:

and step A1, controlling an oil pump, an overflow valve and a plywood valve of the filter pressing system to open, and controlling the filter plate to start to execute plywood action.

Step A2, respectively judging whether the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod all meet first plywood allowable conditions, if not, controlling an overflow valve to be closed, closing a plywood valve and opening a pressure relief valve, controlling related valves to operate according to the real-time plywood pressure monitoring values of the filter plate, the laminating pressure monitoring values and the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod to realize plywood adjustment until the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod all meet the first plywood allowable conditions, and entering step A3. When the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod are smaller than or equal to a set value, the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod are judged to meet the first plywood permission condition, otherwise, the real-time axial force monitoring values are not met.

And step A3, when the pressure monitoring value of the pressure filter meets the second plywood allowable condition, controlling the overflow valve to be closed and the pressure relief valve to be opened. In practical application, the plywood pressure monitoring value of the filter press is continuously obtained in real time and is compared with the plywood pressure set value until the plywood pressure monitoring value of the filter press is determined to be greater than or equal to the plywood pressure set value, and the plywood pressure monitoring value of the filter press meets the second plywood allowable condition.

And step A4, when the press fit pressure monitoring value of the press filter meets the third plywood permission condition, controlling the pressure release valve to be closed, the plywood valve to be closed and the oil pump to be closed, and completing the plywood action of the press filter. In practical application, the pressing pressure monitoring value of the filter press is continuously obtained in real time and is compared with the pressure relief pressure set value until the pressing pressure monitoring value of the filter press is determined to be less than or equal to the pressure relief pressure set value, and the pressing pressure monitoring value of the filter press meets the allowable conditions of the third plywood.

In consideration of the fact that the real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod are unexpectedly too high due to uneven force application, which does not belong to functional obstacles of a valve or a structure and can be recovered through corresponding adjustment, in one embodiment of the invention, after the fact that whether the real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod meet the allowance condition of the first plate is judged in step a2, if not, the filter plate is controlled to be adjusted immediately according to the following operations:

In practical application, pressure sensors can be additionally arranged on two sides of the filter plate suspension rod, the axial pressure on the suspension rod is monitored in real time, when the axial pressure on one side exceeds a set value, a PLC sends a reverse motion signal, when the filter plate moves to a reverse target position, forward movement causing faults is repeatedly executed, if the reciprocating motion reaches three times, the axial pressure value exceeding the set value still exists, the PLC controls the automatic stop of the operation of the filter press, buzzing alarm is given out, manual intervention is prompted, and the equipment state is checked.

Further, in one embodiment, in step a2, the process of controlling the operation of the associated valve to effect the adjustment of the plywood includes the following operations:

and when the real-time pressing pressure monitoring value of the filter press meets the pressure relief pressure set value or less, controlling the pressure relief valve to be closed, the overflow valve to be opened and the plate opening valve to be opened.

And judging whether a monitoring value exceeding the set value of the axial force of the filter plate suspension rod exists in the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod, if so, giving an alarm, and if not, controlling the closing of an overflow valve and the opening of a pressure relief valve.

In one embodiment, a real-time plywood pressure monitoring value of the filter press is continuously obtained in real time and is compared with a pressure relief pressure set value until the pressure relief pressure monitoring value is determined to be less than or equal to the pressure relief pressure set value, the pressure relief valve is controlled to be closed, the plywood valve is closed, the overflow valve is opened, the plywood valve is opened, real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod are obtained, and the next operation is executed.

Next, judging whether the axial force of the filter press on the left side and the right side of the current filter plate suspension rod exceeds a set value of the axial force of the filter plate suspension rod, if so, indicating that the axial force of the filter press on the left side and the right side of the current filter plate suspension rod still does not meet a first plywood allowable condition, at the moment, alarming is needed to prompt a worker to intervene, and if the axial force of the filter press on the left side and the right side of the current filter plate suspension rod does not exceed the set value of the axial force of the filter plate suspension rod, indicating that the axial force of the filter press on the two sides of the current filter plate suspension rod can meet the first plywood allowable condition after adjustment, controlling an overflow valve to be closed;

in one embodiment, a real-time pressing pressure monitoring value of the filter press is continuously obtained in real time and is compared with a pressure relief pressure set value until the pressure relief pressure monitoring value is determined to be less than or equal to the pressure relief pressure set value, the pressure relief valve and the plate opening valve are controlled to be closed, and the overflow valve and the plate closing valve are opened.

In the embodiment, in order to ensure that the axial force monitoring values on the two sides of the filter plate suspension rod of the filter press meet the allowable conditions of the first plywood after the series of operations are finished, the step A2 is executed again to judge the axial force monitoring values on the two sides of the filter plate suspension rod again, so that the condition that the axial force of the filter plate suspension rod is unqualified possibly caused by multi-link operation is avoided to a considerable extent, the synchronous control of a plurality of filter plates can also effectively ensure the action qualification of all the filter plates, and the operational reliability and the accuracy of the plywood of the filter press are improved.

Specifically, in an embodiment, in the step a1, the method further includes:

after the oil pump, the overflow valve and the plywood valve are opened, counting the operating times of plywood, judging whether the accumulated times of plywood reaches a set time threshold value, and if so, giving an alarm; if not, the accumulated times of the operation of the plywood does not exceed the set times and is within the acceptable range, and the synchronous control flow of the plywood is continuously executed. The operation in each embodiment of the invention is automatic operation to realize plate combination control of the filter press, in order to avoid the phenomenon that plate combination attempt times in a set time period of the filter press are too frequent after a fault is known, the plate combination time threshold value is set in the embodiment of the invention, when the automatic plate combination is started, an oil pump, an overflow valve and a plate combination valve are opened, the plate combination operation times are accumulated, whether the accumulated plate combination times reach the set time threshold value is judged, and if yes, an alarm is given. This scheme also can avoid to a certain extent the plywood operation in-process because of repeated redundant operation, resource loss and the trouble that leads to, during practical application, plywood number of times threshold value can be set up by the staff according to the type and the attribute of pressure filter, for example set up to 3 times, judges that the plywood number of times after the accumulation reaches 3 times, then reports to the police.

Specifically, fig. 3 is a flowchart illustrating the procedure of the opening plate synchronization control process of the method for automatically controlling the synchronous action of the filter plates of the filter press according to the embodiment of the present invention, as shown in fig. 3, in one embodiment, when it is determined that the filter press has a requirement for opening the plates, the method comprises the following steps:

and step B2, controlling an oil pump, an overflow valve and a plate opening valve of the filter pressing system to open when the monitoring value of the pressing pressure meets the first plate opening allowance condition. In practical application, the pressing pressure monitoring value of the filter press is continuously collected in real time and judged until the pressing pressure monitoring value is smaller than the pressure relief pressure set value, the pressing pressure monitoring value of the filter press meets the first plate opening allowing condition, and an oil pump, an overflow valve and a plate opening valve of the filter press system are controlled to be opened.

And B3, judging whether the real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod meet a second plate opening permission condition, if not, controlling the overflow valve to be closed, closing the plate opening valve, opening the pressure relief valve, controlling the relevant valves to operate according to the pressing pressure monitoring values of the filter plates and the real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod to realize plate opening adjustment until the real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod of the filter press meet the second plate opening permission condition, and entering the step B4. And when the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod are determined to be less than or equal to a set value, determining that the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod both meet a second plate opening permission condition, otherwise, determining that the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod do not.

And step B4, when the opening states of the two sides of the filter plate reach the set positions within the set time, controlling the oil pump and the overflow valve to be closed, and opening the pressure relief valve. Specifically, the plate opening state of the filter press is continuously obtained in real time until the plate opening state is determined to reach a set position, the oil pump is controlled to be closed, the overflow valve is controlled to be closed, and the pressure relief valve is controlled to be opened. In practical application, the real-time plate opening state data of the filter press is obtained through the plate opening in-place limit switch in the filter press.

In practical application, when the plate opening action is synchronously controlled and executed, in-place limit switches can be arranged on two sides of the filter press, if one side of the filter press reaches a target position and the other side of the filter press does not reach the target position within a set time, the PLC controls the filter press to automatically stop running, buzzes for alarming, prompts manual intervention and checks the state of equipment.

And step B5, when the press fit pressure monitoring value meets the third plate opening allowance condition, controlling the pressure relief valve and the plate opening valve to be closed, and completing the plate opening action of the filter press. In practical application, the press fit pressure monitoring value of the filter press is continuously obtained in real time and is compared with the pressure relief pressure set value until the press fit pressure monitoring value of the filter press is determined to be less than or equal to the pressure relief pressure set value, the press fit pressure monitoring value of the filter press meets the third plate opening permission condition, the pressure relief valve is controlled to be closed, the plate opening valve is controlled to be closed, and the plate opening is completed and prompt information is issued.

Further, in one embodiment, in step B3, the process of controlling the operation of the relevant valve to realize the opening adjustment includes the following operations:

when the press-fit pressure monitoring value meets the set pressure relief value, controlling the pressure relief valve to be closed, and controlling the overflow valve and the plywood valve to be opened; specifically, the pressing pressure monitoring value of the filter press is continuously obtained in real time and is compared with the pressure relief pressure set value, and the pressure relief valve and the plate opening valve are controlled to be closed, and the overflow valve and the plate opening valve are controlled to be opened until the pressing pressure monitoring value is determined to be less than or equal to the pressure relief pressure set value.

Judging whether the real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod exceed the axial force set value of the filter plate suspension rod or not, if so, giving an alarm, and if not, further controlling an overflow valve to be closed and a pressure relief valve to be opened when the pressing pressure monitoring value meets the pressure set value of a plywood or more; in the step, when the condition that the real-time axial force monitoring values on the two sides of the filter plate suspension rod exceed the axial force set value of the filter plate suspension rod exists, the axial forces on the two sides of the filter plate suspension rod of the filter press still do not meet a second plate opening allowing condition, at the moment, an alarm needs to be given, otherwise, the axial forces on the two sides of the filter plate suspension rod of the filter press can meet the second plate opening allowing condition after adjustment, subsequent operation is executed to judge whether the plywood pressure monitoring value meets the set condition, specifically, the pressing pressure monitoring value of the filter press is continuously obtained in real time and is compared with the plywood pressure set value, and when the pressing pressure monitoring value is determined to meet the plywood pressure set value, an overflow valve is controlled to be closed, and the pressure relief valve is.

And further, when the lamination pressure monitoring value is less than or equal to the pressure relief pressure set value, controlling the pressure relief valve and the plywood valve to close, and controlling the overflow valve and the plywood valve to open, and executing the step B3 again, wherein in the step, the lamination pressure monitoring value of the filter press is continuously obtained in real time and is compared with the pressure relief pressure set value until the lamination pressure monitoring value is determined to be less than or equal to the pressure relief pressure set value, the pressure relief valve and the plywood valve are controlled to close, the overflow valve and the plywood valve are controlled to open, and the step B3 is executed again.

In this embodiment, in order to ensure that the axial force monitoring value of the filter plate suspension rod of the filter press meets the second opening allowance condition after a series of adjustment actions are performed, the step B3 is performed again to detect the axial force monitoring value of the filter plate suspension rod again, so that the axial force change of the filter plate suspension rod, which may be caused by multi-link operation, is avoided to a considerable extent, and the opening operation reliability and accuracy of the filter press are improved.

Further, in one embodiment, in step B2, the method further includes:

and after the oil pump, the overflow valve and the plate opening valve are opened, counting the running times of the plate opening, judging whether the accumulated plate opening times reach a set time threshold value, and if so, alarming. In the embodiment, a plate opening time threshold value is set, when an automatic plate opening program is started, specifically, after an oil pump, an overflow valve and a plate opening valve are controlled to be opened, the current plate opening operation time is increased by one, whether the accumulated plate opening time reaches the set time threshold value or not is judged, and if yes, an alarm is given; if not, the accumulated times of the board opening operation does not exceed the set times and is within the acceptable range, and the board opening synchronous control process is continuously executed. By adopting the scheme, the phenomenon that the plate opening attempt times are too frequent in a set time period of the filter press after the fault is known to exist can be avoided, meanwhile, the resource loss and the fault caused by repeated redundant operation in the plate opening operation process can be avoided to a certain extent, the service life of each related structure is prolonged, in the practical application, the plate opening time threshold value can be set to 3 times by a worker according to the type and the attribute of the filter press, and when the accumulated plate opening times are judged to reach 3 times, the alarm is given.

Through the detection, the states of the filter plates of the filter press in the synchronous moving process and the states of the filter plates of the filter press after reaching the target position can be automatically detected and controlled, so that the automatic control of the movement of the filter plates of the filter press is realized to the greatest extent.

In one embodiment, the method further comprises:

and displaying and storing the acquired real-time axial force monitoring value, plywood pressure monitoring value and pressing pressure monitoring value data on the two sides of the filter plate hanging rod in association with time information so as to be checked, called and analyzed by a user. The method provides a way for users to check and call data in real time, and is helpful for the users to realize the optimization and management of the operation scheme of the open-close plate of the filter press or each component of the filter press by analyzing the recorded data.

Specifically, in one embodiment, when alarming, the following steps are executed: controlling the filter press to pause, outputting an alarm prompt signal corresponding to the fault data, and reminding workers to intervene to remove the fault; wherein the fault data includes information on the faulty component and the operating status of the current filter press. In the embodiment, when the alarm information is output to remind the worker of removing the fault, the fault position information of the filter press and the current fault operation message are output to the worker, so that the worker can be helped to accurately match with a proper maintenance worker, and the timeliness and the success rate of removing the fault can be improved by the maintenance worker according to the obtained information.

In practical application, the method for automatically controlling the opening and closing plate of the filter press can also acquire the operation data of related components of the filter press through the oil tank liquid level meter, the oil cylinder pressure sensor and the oil tank thermometer of the hydraulic station, and alarm is given when the operation data is abnormal, so that the cascading failure caused by the fact that local abnormality is not solved in time is avoided. By adopting the technical scheme of the embodiment of the invention, the synchronous control of the opening and closing plate actions of each filter plate of the filter press is realized based on the strategy of process control and based on the real-time axial force feedback on both sides of the filter plate suspension rod, the state data feedback of the limit switches on both sides of the filter plate and other related feedback data, the state of the filter plate of the filter press in the synchronous moving process and the state after the filter plate reaches the target position can be automatically detected and controlled, the automatic control of the movement of the filter plate of the filter press is realized to the greatest extent, can respond in time when the hidden trouble or the trouble occurs, avoids the filter plate damage or serious trouble caused by the repeated operation of the PLC which can not receive the indication signal when the filter plate has abnormal condition, on the basis of effectively realizing reliable automatic action of the opening-closing plate, the time and the cost for processing faults are greatly reduced.

Example two

In view of other aspects of any one or more of the embodiments described above, the present invention also provides a system for automatically controlling the synchronized movement of filter plates in a filter press. The system performs the method or steps described in any one or more of the embodiments above. Fig. 4 is a schematic diagram showing the structure of the system for automatically controlling the synchronous action of the filter plates of the filter press according to the embodiment of the present invention, and the structure of the system will be described with reference to the information in fig. 4.

An operating instruction identification module 41 configured to identify operating instructions for the filter press. In the step, in order to determine whether the current filter press has a control instruction for executing the action and specifically what action process needs to be automatically executed, after the action to be executed is identified and determined to be a plywood process, the subsequent functional operation is further executed.

A plate closing/opening synchronous control module 43, which is configured to collect pressure data of both sides of a suspension rod of a filter plate of the filter press and limit switch state data of both sides of the filter plate when the filter press has a plate closing/opening action command,

the pressure data at two sides of a filter press filter plate suspension rod is used as a basis to combine a real-time plywood pressure monitoring value and a pressing pressure monitoring value to control an oil pump of a filter press system and related valves of plywood to operate, the pressure data at two sides of the filter press filter plate suspension rod and limit switch state data at two sides of the filter plate are used as a basis to combine the real-time plywood pressure monitoring value and the pressing pressure monitoring value to control the oil pump of the filter press system and related valves of open plates to operate, and a plurality of filter plates of the filter press are automatically controlled to synchronously realize the action of open plates according to the set plywood/open plate requirements; wherein, the relevant valve of plywood includes: relief valve, closing plate valve, overflow valve and opening plate valve, the relevant valve of opening the board includes: pressure relief valve, closing plate valve, overflow valve, opening plate valve and relief valve.

And the data management module 45 is configured to associate, display and store the acquired filter plate suspension rod axial force monitoring value, plywood pressure monitoring value and pressing pressure monitoring value data with time information so as to be checked, called and analyzed by a user. The method provides a way for users to check and call data in real time, and is helpful for the users to realize the optimization and management of the operation scheme of the open-close board of the filter press or each component of the filter press by analyzing the data.

Further, the plywood/open board synchronization control module 43 can be divided into a plywood synchronization control unit and an open board synchronization control unit, and in one embodiment, when the filter press has a plywood action command, the plywood synchronization control unit performs control by:

In practical application, in an embodiment, after determining whether the real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod meet the first plate allowable condition in step a2, if not, controlling the filter plate to perform immediate adjustment according to the following operations:

Further, in one embodiment, in step A2, the plywood synchronization control unit controls the operation of the associated valves to effect the adjustment of the plywood, including the operations of:

judging whether a monitoring value exceeding a set value of the axial force of the filter plate suspension rod exists in real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod, if so, giving an alarm, otherwise, controlling an overflow valve to be closed and a pressure relief valve to be opened;

In one embodiment, the plywood synchronous control unit continuously obtains a real-time plywood pressure monitoring value of the filter press in real time and compares the real-time plywood pressure monitoring value with a pressure relief pressure set value until the pressure relief pressure set value is determined to be less than or equal to the pressure relief pressure set value, the pressure relief valve is controlled to be closed, the plywood valve is controlled to be closed, the overflow valve is controlled to be opened, the opening plate valve is controlled to be opened, real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod are.

in one embodiment, a plywood synchronous control unit continuously acquires a real-time pressing pressure monitoring value of the filter press in real time and compares the real-time pressing pressure monitoring value with a pressure relief pressure set value until the real-time pressing pressure monitoring value is determined to be less than or equal to the pressure relief pressure set value, the pressure relief valve and the plate opening valve are controlled to be closed, and the overflow valve and the plate closing valve are opened.

In this embodiment, in order to ensure that the axial force monitoring values on both sides of the filter plate suspension rod of the filter press meet the allowable conditions of the first closing plate after the series of operations are completed, the step a2 is executed again to re-determine the axial force monitoring values on both sides of the filter plate suspension rod, so that unqualified changes in the axial force of the filter plate suspension rod, which may be caused by the multi-link operations, are avoided to a considerable extent, and the operational reliability and accuracy of the closing plate of the filter press are improved.

Specifically, in one embodiment, the plywood synchronization control sheet is further configured to:

in step a1, the number of times the plywood is operated after the oil pump, the relief valve, and the plywood valve are opened is counted, and it is determined whether the accumulated number of times of plywood reaches a set number threshold, and if so, an alarm is given. The operation in each embodiment of the invention is automatic operation to realize plate combination control of the filter press, in order to avoid the phenomenon that the plate combination attempt times in a set time period of the filter press are too frequent after the abnormal condition or the fault exists, the plate combination time threshold value is set in the embodiment of the invention, when the automatic plate combination is started, the oil pump, the overflow valve and the plate combination valve are opened, the plate combination operation times are accumulated, whether the accumulated plate combination times reach the set time threshold value is judged, and if yes, the alarm is given. This scheme also can avoid to a certain extent the plywood operation in-process because of repeated redundant operation, resource loss and the trouble that leads to, during practical application, plywood number of times threshold value can be set up by the staff according to the type and the attribute of pressure filter, for example set up to 3 times, judges that the plywood number of times after the accumulation reaches 3 times, then reports to the police.

In one embodiment, when it is determined that the filter press has an open plate requirement, the control is performed by the open plate synchronization control unit through the following steps:

step B1, controlling the opening of the pressure relief valve;

And B3, judging whether the real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod meet a second plate opening permission condition, if not, controlling the overflow valve to be closed, closing the plate opening valve, opening the pressure relief valve, controlling the relevant valves to operate according to the pressing pressure monitoring values of the filter plates and the real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod to realize plate opening adjustment until the real-time axial force monitoring values on the left side and the right side of the filter plate suspension rod of the filter press meet the second plate opening permission condition, and entering the step B4. When the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod are determined to be smaller than or equal to a set value, the real-time axial force monitoring values of the left side and the right side of the filter plate suspension rod are determined to meet the first plywood permission condition, and otherwise, the real-time axial force monitoring values are not met.

And step B4, when the opening state reaches the set position, controlling the oil pump and the overflow valve to be closed, and opening the pressure relief valve. Specifically, the plate opening state of the filter press is continuously obtained in real time until the plate opening state is determined to reach a set position, the oil pump is controlled to be closed, the overflow valve is controlled to be closed, and the pressure relief valve is controlled to be opened. In practical application, the real-time plate opening state data of the filter press is obtained through the plate opening in-place limit switch in the filter press.

Further, in one embodiment, in step B3, the opening synchronization control unit controls the operation of the relevant valves to realize the opening adjustment process, including the following operations:

In the embodiment, in order to ensure that the axial force monitoring values of the suspension rods on the two sides of the filter plate of the filter press meet the second plate opening allowance condition after a series of adjustment actions are performed, the step B3 is performed again to detect the axial force monitoring values of the suspension rods on the two sides of the filter plate again, so that the axial force change of the suspension rods on the filter plate, which is possibly caused by multi-link operation, is avoided to a considerable extent, and the plate opening operation reliability and accuracy of the filter press are improved.

Further, in an embodiment, the board opening synchronization control unit is further configured to:

in step B2, after the oil pump, the overflow valve and the plate opening valve are opened, the plate opening operation times are counted, whether the accumulated plate opening times reach a set time threshold value is judged, and if yes, an alarm is given. In the embodiment, the plate opening time threshold is set, when the automatic plate opening program is started, specifically, after the oil pump, the overflow valve and the plate opening valve are controlled to be opened, the current plate opening operation time is increased by one, whether the accumulated plate opening time reaches the set time threshold is judged, and if yes, an alarm is given. By adopting the scheme, the phenomenon that the plate opening attempt times are too frequent in a set time period of the filter press after the fault is known to exist can be avoided, meanwhile, the resource loss and the fault caused by repeated redundant operation in the plate opening operation process can be avoided to a certain extent, the service life of each related structure is prolonged, in the practical application, the plate opening time threshold value can be set to 3 times by a worker according to the type and the attribute of the filter press, and when the accumulated plate opening times are judged to reach 3 times, the alarm is given.

Specifically, in one embodiment, when the board combination/opening synchronization control module gives an alarm, the following steps are specifically executed: controlling the filter press to pause, outputting an alarm prompt signal corresponding to the fault data, and reminding workers to intervene to remove the fault; wherein the fault data includes information on the faulty component and the operating status of the current filter press. In the embodiment, when the alarm information is output to remind the worker of removing the fault, the fault position information of the filter press and the current fault operation message are output to the worker, so that the worker can be helped to accurately match with a proper maintenance worker, and the timeliness and the success rate of removing the fault can be improved by the maintenance worker according to the obtained information.

In the system for automatically controlling the synchronous action of the filter plates of the filter press, provided by the embodiment of the invention, each module or unit structure can independently operate or operate in a combined mode according to the actual application requirements so as to realize corresponding technical effects.

It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.

Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, appearances of the phrase "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.

Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A method for automatically controlling the synchronous movement of filter plates of a filter press, which is characterized by comprising the following steps:

identifying operating instructions of the filter press;

2. The method of claim 1, wherein when the filter press has plywood requirements, the method is controlled by:

3. The method as claimed in claim 2, wherein in the step a1, further comprising:

4. The method as claimed in claim 2 or 3, wherein in step a2, after determining whether the real-time axial force monitoring values of the left and right sides of the filter plate suspension rod satisfy the first plate allowable condition, if not, the filter plate is controlled to be adjusted instantly according to the following operations:

5. A method as set forth in claim 2 or 3 wherein in step a2, controlling the operation of the associated valve to effect the adjustment of the plywood comprises the operations of:

6. The method of claim 1, wherein when the filter press has an open plate requirement, controlling is performed by:

7. The method of claim 5, wherein in the step B3, the operation of the relevant valve is controlled to realize the process of opening adjustment, and the process comprises the following operations:

8. The method according to any one of claims 5 to 6, wherein in the step B2, the method further comprises:

9. The method according to any one of claims 1 to 8, characterized in that, in case of an alarm, the following steps are performed: controlling the filter press to pause, outputting an alarm prompt signal corresponding to the fault data, and reminding workers to intervene to remove the fault; wherein the fault data includes information on the faulty component and the operating status of the current filter press.

10. A system for automatically controlling the synchronous movement of filter plates of a filter press, characterized in that it carries out the method according to any one of claims 1 to 9.