CN201643914U - Leak Detection System of Bag Dust Collector Based on Programmable Logic Controller - Google Patents

Abstract

The utility model discloses a bag dust collector leak detection system based on a programmable logic controller, which includes a computer and at least one analog module, and also includes an electrostatic induction dust concentration sensor and an adjustable Programmable logic controller PLC, the electrostatic induction dust concentration sensor is installed between the outlet pipe of the bag filter box and the main exhaust pipe, which is connected to the input end of the analog module through a single-wire non-destructive signal transmission line, and the analog module The output end is connected to the data interface of the programmable logic controller PLC through a cable, and the communication port of the programmable logic controller PLC is connected to the computer through a shielded two-core communication line. The utility model has the advantages of simple structure and convenient operation, can remind the user whether the filter bag of the bag filter has been leaked, and realizes dynamic monitoring of the discharge concentration of the bag filter.

Description

Leak Detection System of Bag Dust Collector Based on Programmable Logic Controller

technical field

The utility model relates to the technical field of monitoring of bag dust collectors, in particular to a leak detection system for bag dust collectors based on a programmable logic controller.

Background technique

The bag filter is a kind of high-efficiency dust collector widely used in the market at present. Its working mechanism is that when the dust-laden air passes through the filter bag, the dust is filtered under the action of filtering, collision, static electricity and other forces. When a new filter bag is put in, it is the filter material that acts as a filter. Once a dust layer is formed on the filter material, the filter bag only acts as a support. During the use of the filter bag, due to high temperature, acidity, gas pressure, etc., local deformation, aging, tearing, etc. will occur in the filter bag, resulting in leakage of the filter bag. If it is not found and replaced in time, the number of leaking filter bags will increase, which will eventually lead to the failure of the bag filter. Therefore, users who use the bag filter urgently need a product that reminds the user whether the filter bag of the bag filter has been leaked.

Utility model content

The purpose of this utility model is to overcome the deficiency of the above-mentioned background technology, and provide a bag filter leak detection system based on a programmable logic controller, which is simple in structure, easy to operate, and can remind users whether the filter bag of the bag filter has been leaked.

The bag filter leak detection system based on the programmable logic controller provided by the utility model includes a computer and at least one analog module, and also includes an electrostatic induction dust concentration sensor and a programmable logic sensor matched with each bag filter box. Controller PLC, the electrostatic induction dust concentration sensor is installed between the outlet pipe of the bag filter box and the main exhaust pipe, which is connected to the input end of the analog module through a single-wire non-destructive signal transmission line, and the output end of the analog module It is connected with the data interface of the programmable logic controller PLC through a cable, and the communication port of the programmable logic controller PLC is connected with the computer through a shielded two-core communication line.

In the above technical solution, the output terminal of the programmable logic controller PLC is connected with an alarm that matches the electrostatic induction dust concentration sensor one by one.

In the above technical solution, the input end of the programmable logic controller PLC is connected with a light touch button for canceling the alarm.

In the above technical solution, an RS485 to RS232 converter with a photoelectric isolator is connected between the 485 interface of the programmable logic controller PLC and the computer.

In the above technical solution, at least one analog module is further connected between the analog module and the programmable logic controller PLC.

In the above technical solution, the analog module is also connected to the power supply terminal of the programmable logic controller PLC through a two-wire direct current power supply line.

In the above technical solution, the outer surface of the electrostatic induction dust concentration sensor is grounded.

The programmable logic controller PLC converts the analog electrical signal of the dust concentration into a digital signal, and transmits the digital signal to the computer according to the specified data transmission protocol. At the same time, the programmable logic controller PLC also receives the alarm command sent by the computer and drives the alarm. The calculation software analyzes and compares the time characteristics of the dust concentration value to give a judgment to determine whether there is leakage of the filter bag. And the filter bag leakage prompt text information is given on the computer display interface, and an alarm command is sent to the programmable controller according to the designed protocol for transmission with the programmable controller. Then the alarm is driven by the programmable controller to give the leakage sound information. The function of compiling computer software is to decompose and calculate the digital signal sent by the programmable controller, and save it in the Microsoft Access database according to the attributes of the sampling time, sampling channel number (corresponding to the dust collector box) and sampling concentration as a record .

The utility model constructs and optimizes the monitoring system by compiling programmable controller software and computer software to form a reliable real-time monitoring system for the discharge concentration of the bag filter, and gives whether the filter bag is leaking and whether the filter bag is leaking or not through the change of the discharge concentration. Judgment of which dust collector box the leakage occurs in, timely find the filter bag leakage, and send an alarm to replace the reminder to avoid the failure of the dust collector. The system is stable and has strong anti-interference ability, and the modular structure increases the flexibility of configuration. The programmable logic controller PLC used has a photoelectric isolation device to prevent external interference signals, which can protect the programmable logic controller PLC from damage. The system also has the feature of adjustable alarm threshold and sampling time interval. Through the parameter setting dialog box of the computer software, the alarm threshold and sampling time interval can be set, and the setting range is wide. The alarm accuracy rate of the utility model reaches 98%, basically no maintenance is required, the operation cost is low, the structure is simple, and the operation is convenient. In addition to the filter bag monitoring function, the utility model also has data display and storage functions, and can be used as a dust concentration monitoring and recording system.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1-static induction dust concentration sensor, 2-single-wire lossless signal transmission line, 3-analog module, 4-two-wire DC power supply line, 5-row cable, 6-programmable logic controller PLC, 7-with photoelectric isolation RS485 to RS232 converter of the device, 8-touch button, 9-alarm, 10-computer.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:

Referring to Fig. 1, the bag filter leak detection system based on the programmable logic controller provided by the utility model includes a computer 10 and at least one analog-to-digital conversion module 3, which is matched and installed with each bag filter box. The electrostatic induction dust concentration sensor 1 and the programmable logic controller PLC6, the electrostatic induction dust concentration sensor 1 is installed between the outlet pipe of the bag filter box and the main exhaust pipe, the outer surface of the electrostatic induction dust concentration sensor 1 is grounded, and it passes through a single wire The lossless signal transmission line 2 is connected to the analog module 3, and the analog module 3 is also connected to the power supply terminal of the programmable logic controller PLC6 through a two-wire DC power supply line. The output end of the analog module 3 is connected to the data interface of the programmable logic controller PLC6 through the cable 5, and the communication port of the programmable logic controller PLC6 is connected to the computer 10 through a shielded two-core communication line. In practical applications, according to the number of bag filters, at least one analog module 3 can be connected between the analog module 3 and the programmable logic controller PLC6, and one analog module 3 can handle up to 4 bag filters The data. The output end of the programmable logic controller PLC6 is connected with an alarm 9 matched one by one with the electrostatic induction dust concentration sensor 1, and the input end of the programmable logic controller PLC6 is connected with a light touch button 8 for disabling the alarm. A RS485 to RS232 converter 7 with a photoelectric isolator is connected between the 485 interface of the programmable logic controller PLC6 and the computer 10 .

The working principle of the utility model is as follows:

Convert the analog electrical signal induced by the electrostatic induction dust concentration sensor 1 into a 12-bit digital signal, and transmit it to the programmable logic controller PLC6, and the programmable logic controller PLC6 converts the concentration range of the digital value of the concentration value and sends the format The data and verification, the arrangement of sending agreement, send to computer 10 then. At the same time, the programmable logic controller PLC6 regularly scans each channel, accepts and judges whether the data sent by the calculation is an acceptance data or an alarm command. If the data is accepted, the concentration data is sent to the computer 10. If it is an alarm command, the output relay is closed and the alarm is issued. Device 9 moves. The computer 10 regularly sends data requests to the programmable logic controller PLC6, judges the integrity of the data, removes interference data, and removes control and other characters in the data frame, takes out the concentration data and converts them into decimal numbers for judgment, display, and storage. If it exceeds the set alarm threshold, a text prompt will be given on the display interface of the computer 10, and an alarm command will be sent to the programmable logic controller PLC6 at the same time. Alarm 9 is driven by programmable logic controller PLC6, and the continuous alarm time of alarm 9 is 50 seconds. When the duration of the alarm is reached, the alarm is removed, and the button 8 can also be lightly touched to remove the alarm within the duration of the alarm.

The comparison of the concentration value by the computer software is based on the fact that the concentration values of three consecutive sampling time intervals exceed the set alarm concentration threshold, that is, an alarm signal and instruction are issued. The programmable logic controller completes the conversion of dust concentration analog signal to digital number, and converts it into dust concentration, sends data to the computer according to the specified data transmission protocol, accepts computer instructions, and controls the action of the alarm. The computer software sends an alarm command according to the three consecutive concentration data exceeding the set alarm value. The computer completes the functions of dust concentration data storage, calculation, display, and positioning of the leakage filter bag box. The dust collector end uses an acoustic signal to alarm, and its sound level reaches 95dB, and the computer end uses an alarm prompt signal that displays text. The filter bag leakage monitoring system has strong anti-interference ability, modular structure, flexible hardware configuration, and can be expanded with the expansion of the bag filter. The system has an alarm accuracy rate of 98%, and the sensor is suitable for temperatures below 350°C.

The programmable logic controller PLC6 adopted by the utility model has an RS485 communication interface, and uses a 50Hz220V AC power supply provided by the city. The DC power supply of the analog module 3 is provided by the programmable logic controller PLC6, and a 24V DC power supply can also be used. In practical applications, according to the number of baghouses of the bag filter and the number of points of the programmable logic controller PLC6, the programmable logic controller PLC6 and the analog-to-digital conversion module 3 can be flexibly configured, not limited to the programmable logic controller PLC6 The specific model is not limited to the functional difference of the programmable logic controller PLC6.

Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.

The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (7)

1. sack cleaner leak detection system based on programmable logic controller (PLC), it comprises computer (10) and at least one analog module (3), it is characterized in that: also comprise the electrostatic induction sensor of dust concentration (1) and the programmable logic controller (PLC) PLC (6) that install with each sack cleaner casing coupling, described electrostatic induction sensor of dust concentration (1) is installed between the outlet conduit and total air escape pipe of sack cleaner casing, it is connected with the input of analog module (3) by the harmless signal transmssion line (2) of single line, the output of analog module (3) is connected with the data-interface of programmable logic controller (PLC) PLC (6) by winding displacement (5), and the COM1 of programmable logic controller (PLC) PLC (6) is connected with computer (10) by shielding twin-core connection.

2. the sack cleaner leak detection system based on programmable logic controller (PLC) as claimed in claim 1 is characterized in that: the output of described programmable logic controller (PLC) PLC (6) is connected with the alarm (9) that mates one by one with described electrostatic induction sensor of dust concentration (1).

3. the sack cleaner leak detection system based on programmable logic controller (PLC) as claimed in claim 2 is characterized in that: the input of described programmable logic controller (PLC) PLC (6) is connected with and the contact button (8) that is used to remove warning.

4. the sack cleaner leak detection system based on programmable logic controller (PLC) as claimed in claim 1 is characterized in that: RS485 to the RS232 converter (7) that is connected with the band photoisolator between 485 interfaces of described programmable logic controller (PLC) PLC (6) and the computer (10).

5. the sack cleaner leak detection system based on programmable logic controller (PLC) as claimed in claim 1 is characterized in that: also be connected with at least one analog module (3) between described analog module (3) and the programmable logic controller (PLC) PLC (6).

6. the sack cleaner leak detection system based on programmable logic controller (PLC) as claimed in claim 1 is characterized in that: described analog module (3) also links to each other with the feeder ear of programmable logic controller (PLC) PLC (6) by two-wire direct current supply line.

7. the sack cleaner leak detection system based on programmable logic controller (PLC) as claimed in claim 1 is characterized in that: described electrostatic induction sensor of dust concentration (1) external surface grounded.

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