阅读说明：本技术 一种电除尘用plc控制柜及控制方法 (PLC control cabinet for electric precipitation and control method ) 是由 林福泉 吴昌平 林健 于 2019-11-25 设计创作，主要内容包括：本发明公开了一种电除尘用PLC控制柜及控制方法,涉及电除尘技术领域,包括控制柜柜体和底座,控制柜柜体包括矩形柜体上侧的倒棱台形柜体构成的柜体结构；控制柜柜体的两侧设置水平减震装置；控制柜柜体下方设置竖直减震装置；控制系统包括PLC控制器、电源电路、数据采集电路、偏励磁检测电路、可控硅触发电路以及保护电路；通过数据采集电路采集到变压器一次电压电流、二次电流、电压作为模拟量通过PLC模拟量输入模块送入CPU；偏励磁作为数字量信号送到CPU；CPU计算处理后输出触发脉冲给可控硅触发电路,通过调整可控硅导通角控制变压器一次电压,从而而调节电场电压,同时变压器二次电流经过整流器整流后送给除尘器,使除尘器保持较高的除尘效率。(The invention discloses a PLC control cabinet for electric precipitation and a control method, and relates to the technical field of electric precipitation, and the PLC control cabinet comprises a control cabinet body and a base, wherein the control cabinet body comprises a cabinet body structure formed by a chamfered platform-shaped cabinet body on the upper side of a rectangular cabinet body; horizontal damping devices are arranged on two sides of the control cabinet body; a vertical damping device is arranged below the cabinet body of the control cabinet; the control system comprises a PLC controller, a power supply circuit, a data acquisition circuit, a bias excitation detection circuit, a silicon controlled trigger circuit and a protection circuit; the primary voltage current, the secondary current and the voltage of the transformer are collected by a data collection circuit and are sent to a CPU (central processing unit) as analog quantities through a PLC (programmable logic controller) analog quantity input module; bias excitation is sent to a CPU as a digital quantity signal; the CPU outputs trigger pulse to the SCR trigger circuit after calculation and processing, primary voltage of the transformer is controlled by adjusting the conduction angle of the SCR, so that the voltage of an electric field is adjusted, and secondary current of the transformer is rectified by the rectifier and then is sent to the dust remover, so that the dust remover keeps high dust removal efficiency.)

1. The utility model provides a PLC switch board for electrostatic precipitation, includes the switch board cabinet body (1) and base (2), its characterized in that:

the control cabinet body (1) comprises a cabinet body structure consisting of a rectangular cabinet body (10) at the lower side and a chamfered frustum-shaped cabinet body (11) at the upper side; a movable cabinet door (6) is arranged at the front end of the rectangular cabinet body (10); the shell of the chamfered frustum-shaped cabinet body (11) is of a hollow structure; the top of the outer side of the inverted-pyramid-shaped cabinet body (11) is provided with a ventilation channel (12) capable of emitting heat air; horizontal damping devices for horizontally damping the control cabinet body (1) are symmetrically arranged on two sides of the control cabinet body (1);

the base (2) is U-shaped, the bottom surface of the base is a plane, a supporting plate (3) and a vertical damping device for damping the control cabinet body (1) in the vertical direction are arranged between the lower part of the rectangular cabinet body (10) and the bottom surface of the base (2), and the supporting plate (3) is positioned above the vertical damping device; the control cabinet body (1) is fixed on the supporting plate (3), and two ends of the supporting plate (3) are fixedly connected with two inner side walls in the opening direction of the base (2) respectively;

through holes for heat dissipation are formed in two side faces of the rectangular cabinet body (10), the through holes are provided with heat dissipation pipes (13) communicated with the outside, and the opening directions of the heat dissipation pipes (13) are deviated upwards;

be provided with control system for electrostatic precipitation in the switch board cabinet body (1), control system includes PLC controller, power supply circuit, data acquisition circuit, excitation detection circuitry, silicon controlled rectifier trigger circuit and protection circuit partially, the PLC controller electricity respectively connect power supply circuit data acquisition circuit excitation detection circuitry partially silicon controlled rectifier trigger circuit and protection circuit, silicon controlled rectifier trigger circuit connects between electric wire netting and dust remover power.

2. The PLC control cabinet for electric precipitation according to claim 1, characterized in that:

the horizontal damping device comprises a damping sleeve (40) and a connecting rod (41), and the bottom of the damping sleeve (40) is fixed on the inner side wall of the base (2); a damping spring (42) is arranged in the damping sleeve (40), and one end of the connecting rod (41) is fixedly connected with a damping pressing block (43) corresponding to the damping spring (42); the other end of the connecting rod (41) is fixedly connected with the outer side wall of the rectangular cabinet body (10).

3. The PLC control cabinet for electric precipitation according to claim 1, characterized in that:

the vertical damping device comprises a metal elastic plate (50) and a damping spring (51); two ends of the metal elastic plate (50) are respectively connected with the inner side wall of the base (2); the arc-shaped upper end surface of the metal elastic plate (51) is contacted with the lower end of the support plate (3); the horizontal bottom of metal elastic plate (50) with the horizontal bottom surface of base (2) is connected, the upper end of buffer spring (51) with the arc bottom surface fixed connection of metal elastic plate (50), just the lower extreme of buffer spring (51) with the horizontal bottom surface fixed connection of base (2).

4. The PLC control cabinet for electric precipitation according to claim 3, characterized in that:

the number of the metal elastic plates (50) is set to be a plurality, and the plurality of metal elastic plates (50) are connected through fixing pieces (501).

5. The PLC control cabinet for electric precipitation according to claim 1, characterized in that:

the surface of the movable cabinet door (6) is provided with an electronic lock, and the electronic lock comprises a coded lock (60) and a fingerprint lock (61).

6. The control method for controlling the electric dust removal by the PLC control cabinet for the electric dust removal as claimed in claim 1 is characterized in that: the method comprises the following steps:

step 1: analog quantity signals of primary voltage, current, secondary voltage, current, turbidity and the like of the transformer are acquired by the data acquisition circuit and are sent to a CPU (central processing unit) through a PLC (programmable logic controller) analog quantity module for calculation processing;

step 2: switching value signals of transformer oil temperature, oil level bias excitation and the like are sent to a CPU for processing through PLC digital value input signals;

and step 3: the PLC controller reads in all analog quantity and digital quantity signals input to the CPU in sequence, carries out corresponding processing through an algorithm, generates two paths of trigger pulses according to the result obtained by processing, sends the two paths of trigger pulses to the main loop silicon controlled voltage regulator, and controls the primary voltage of the transformer by adjusting the conduction angle of the silicon controlled voltage, thereby controlling the input electric field voltage and improving the dust removal efficiency;

and 4, step 4: the secondary current is rectified by the rectifier and then is sent to the dust remover body, and the three processes are repeated to form a control loop.

7. The electric precipitation control method according to claim 6, characterized in that:

the PLC controller is connected with the control terminal, the control terminal is connected with the plurality of alarms, and the control terminal is provided with a human-computer interaction interface.

8. The electric precipitation control method according to claim 7, characterized in that:

the man-machine interaction interface displays data and keys in operation instructions.

Technical Field

The invention relates to the technical field of electric precipitation, in particular to a PLC control cabinet for electric precipitation and a control method.

Background

High-voltage electrostatic dust collectors (EPS) for treating industrial dust pollution are increasingly receiving attention from people because of high dust removal efficiency, low energy consumption, convenient maintenance and management and the like. The mechanism of electrostatic dust collection is that a space electric field generates corona discharge to generate a large amount of free electrons and negative ions, the free electrons and the negative ions are attracted by the space electric field static electricity to be captured by a positive dust collecting electrode, and the dust collecting electrode is cleaned by a dust cleaning device at regular time, so that the air is purified. When the electrostatic dust removal system is abnormal in operation, manual regulation control is often carried out to restore the electrostatic dust removal system to normal operation, and the control mode is efficient; in addition, the control cabinet for control has low heat dissipation efficiency, and the shock attenuation effect is relatively poor, influences the operation of switch board, influences the effect of dust removal then.

Disclosure of Invention

In order to solve the problems of the prior art, the invention takes a PLC as a control center, and primary voltage current, secondary current and voltage of a transformer are collected by a data collection circuit and are sent to a CPU as analog quantities through a PLC analog quantity input module; bias excitation is sent to a CPU as a digital quantity signal; the CPU calculates and processes the sent signals, outputs trigger pulses to the silicon controlled trigger circuit, controls primary voltage of the transformer by adjusting the conduction angle of the silicon controlled, so as to adjust the voltage of an electric field, and simultaneously rectifies secondary current of the transformer by the rectifier and then sends the rectified secondary current to the dust remover, so that the dust remover keeps higher dust removal efficiency; meanwhile, horizontal damping devices are arranged on two sides of the control cabinet to damp vibration generated by the control cabinet in the horizontal direction; meanwhile, a vertical damping device is arranged below the control cabinet to damp vibration generated in the vertical direction of the control cabinet, so that the damping performance of the control cabinet is improved; in addition, the upside of utilizing hot-air upward movement's principle, establishing the upside of switch board into the cabinet body of chamfered frustum shape for the space of upper end is bigger, thereby the upper end hot-air runs off sooner, and then has improved the heat dispersion of switch board.

The invention specifically adopts the following technical scheme:

a PLC control cabinet for electric precipitation comprises a control cabinet body and a base;

the control cabinet body comprises a cabinet body structure consisting of a rectangular cabinet body at the lower side and a chamfered platform-shaped cabinet body at the upper side; the front end of the rectangular cabinet body is provided with a movable cabinet door;

the shell of the chamfered frustum-shaped cabinet body is of a hollow structure; the top of the outer side of the chamfered frustum-shaped cabinet body is provided with a ventilation channel capable of emitting heat air; horizontal damping devices for horizontally damping the control cabinet body are symmetrically arranged on two sides of the control cabinet body;

the base is U-shaped, the bottom surface of the base is a plane, a supporting plate and a vertical damping device for damping the control cabinet body in the vertical direction are arranged between the lower part of the rectangular cabinet body and the bottom surface of the base, and the supporting plate is positioned above the vertical damping device; the control cabinet body is fixed on the supporting plate, and two ends of the supporting plate are respectively fixedly connected with two inner side walls in the opening direction of the base;

through holes for heat dissipation are formed in two side faces of the rectangular cabinet body, the through holes are provided with heat dissipation pipes communicated with the outside, and the opening directions of the heat dissipation pipes are deviated upwards;

the control cabinet is internal to be provided with control system for the electrostatic precipitator, control system includes PLC controller, power supply circuit, data acquisition circuit, excitation detection circuitry, silicon controlled rectifier trigger circuit and protection circuit partially, the PLC controller electricity respectively connect power supply circuit the data acquisition circuit excitation detection circuitry partially silicon controlled rectifier trigger circuit and protection circuit, silicon controlled rectifier trigger circuit connects between electric wire netting and dust remover power.

The horizontal damping device comprises a damping sleeve and a connecting rod, and the bottom of the damping sleeve is fixed on the inner side wall of the base; a damping spring is arranged in the damping sleeve, and one end of the connecting rod is fixedly connected with a damping pressing block corresponding to the damping spring; the other end of the connecting rod is fixedly connected with the outer side wall of the rectangular cabinet body.

The vertical damping device comprises a metal elastic plate and a damping spring; two ends of the metal elastic plate are respectively connected with the inner side wall of the base; the arc-shaped upper end surface of the metal elastic plate is contacted with the lower end of the supporting plate; the horizontal bottom of metal elastic plate with the horizontal bottom surface of base is connected, buffer spring's upper end with the arc bottom surface fixed connection of metal elastic plate, just buffer spring's lower extreme with the horizontal bottom surface fixed connection of base.

The further scheme is that the number of the metal elastic plates is multiple, and the metal elastic plates are connected through fixing pieces.

The further scheme is that an electronic lock is arranged on the surface of the front face of the movable cabinet door and comprises a coded lock and a fingerprint lock.

A control method of electric precipitation comprises the following steps:

step 1: analog quantity signals of primary voltage, current, secondary voltage, current, turbidity and the like of the transformer are acquired by the data acquisition circuit and are sent to a CPU (central processing unit) through a PLC (programmable logic controller) analog quantity module for calculation processing;

step 2: switching value signals of transformer oil temperature, oil level bias excitation and the like are sent to a CPU for processing through PLC digital value input signals;

and step 3: the PLC controller reads in all analog quantity and digital quantity signals input to the CPU in sequence, carries out corresponding processing through an algorithm, generates two paths of trigger pulses according to the result obtained by processing, sends the two paths of trigger pulses to the main loop silicon controlled voltage regulator, and controls the primary voltage of the transformer by adjusting the conduction angle of the silicon controlled voltage, thereby controlling the input electric field voltage and improving the dust removal efficiency;

and 4, step 4: the secondary current is rectified by the rectifier and then is sent to the dust remover body, and the three processes are repeated to form a control loop.

The PLC is connected with a control terminal, the control terminal is connected with a plurality of alarms, and the control terminal is provided with a human-computer interaction interface.

The further scheme is that the human-computer interaction interface displays data and keys in operation instructions.

The invention has the beneficial effects that:

horizontal damping devices are arranged on two sides of the control cabinet to damp vibration generated in the horizontal direction of water inlet of the control cabinet; meanwhile, a vertical damping device is arranged below the control cabinet to damp vibration generated in the vertical direction of the control cabinet, so that the overall damping performance of the control cabinet is improved;

by utilizing the principle that hot air moves upwards, the upper side of the control cabinet is provided with a chamfered table-shaped cabinet body, so that the space at the upper end is larger, the hot air at the upper end is more quickly lost, and the heat dissipation performance of the control cabinet is further improved;

the radiating pipes communicated with the outside are arranged on two sides of the rectangular cabinet body below the chamfered table-shaped cabinet body, and the opening directions of the radiating pipes are upward, so that hot air is easier to be discharged from the inside of the control cabinet through the radiating pipes, and the radiating performance of the control cabinet is further improved;

by taking the PLC as a control center, primary voltage current, secondary current and voltage of the transformer are acquired by a data acquisition circuit and are sent to a CPU (central processing unit) through a PLC analog input module as analog quantities; bias excitation is sent to a CPU as a digital quantity signal; the CPU calculates and processes the sent signals, outputs trigger pulses to the silicon controlled trigger circuit, controls primary voltage of the transformer by adjusting the conduction angle of the silicon controlled, so as to adjust the voltage of an electric field, and simultaneously rectifies secondary current of the transformer by the rectifier and then sends the rectified secondary current to the dust remover, so that the dust remover keeps higher dust removal efficiency;

the remote control terminal with the human-computer interaction interface is arranged, and the human-computer interaction interface displays data and keys in operation instructions. The interaction between the dust removal related data and the terminal is realized, and the remote control can be carried out through the control terminal.

Drawings

Fig. 1 is a schematic structural diagram of a PLC control cabinet for electric precipitation according to embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of a control system in embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of a control method of electric precipitation according to embodiment 2 of the present invention;

the attached drawings are marked as follows: 1-control cabinet body; 10-a rectangular cabinet body; 11-a chamfered table-shaped cabinet body; 12-an air duct; 13-radiating pipes; 2-a base; 3-a support plate; 40-a damping sleeve; 41-a connecting rod; 42-a shock-absorbing spring; 43-a shock-absorbing press block; 50-metal spring plate; 501-a fixing piece; 51-a buffer spring; 6-movable cabinet door; 60-a combination lock; 61-fingerprint lock.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1-2, an embodiment 1 of the present invention discloses a PLC control cabinet for electric precipitation, including a control cabinet body 1 and a base 2; the control cabinet body 1 comprises a cabinet body structure consisting of a rectangular cabinet body 10 at the lower side and a chamfered platform-shaped cabinet body 11 at the upper side; the front end of the rectangular cabinet body 10 is provided with a movable cabinet door 6; the shell of the inverted-pyramid-shaped cabinet body 11 is of a hollow structure; the top of the outer side of the inverted-pyramid-shaped cabinet body 11 is provided with an air duct 12 capable of emitting heat air; horizontal damping devices for horizontally damping the control cabinet body 1 are symmetrically arranged on two sides of the control cabinet body 1; the base 2 is U-shaped, the bottom surface of the base 2 is a plane, a supporting plate 3 and a vertical damping device for damping the control cabinet body 1 in the vertical direction are arranged between the lower part of the rectangular cabinet body 10 and the bottom surface of the base 2, and the supporting plate 3 is positioned above the vertical damping device; the control cabinet body 1 is fixed on a supporting plate 3, and two ends of the supporting plate 3 are respectively fixedly connected with two inner side walls in the opening direction of the base 2; through holes for heat dissipation are formed in two side surfaces of the rectangular cabinet body 10, the through holes are provided with heat dissipation pipes 13 communicated with the outside, and the opening directions of the heat dissipation pipes 13 are deviated upwards; the control cabinet is characterized in that a control system for electric dust removal is arranged in the control cabinet body 1 and comprises a PLC (programmable logic controller), a power supply circuit, a data acquisition circuit, a bias excitation detection circuit, a silicon controlled trigger circuit and a protection circuit, wherein the PLC is respectively and electrically connected with the power supply circuit, the data acquisition circuit, the bias excitation detection circuit, the silicon controlled trigger circuit and the protection circuit, and the silicon controlled trigger circuit is connected between a power grid and a dust remover power supply. Horizontal damping devices are arranged on two sides of the control cabinet to damp vibration generated in the horizontal direction of water inlet of the control cabinet; meanwhile, a vertical damping device is arranged below the control cabinet to damp vibration generated in the vertical direction of the control cabinet, so that the overall damping performance of the control cabinet is improved;

by utilizing the principle that hot air moves upwards, the upper side of the control cabinet is provided with a chamfered table-shaped cabinet body, so that the space at the upper end is larger, the hot air at the upper end is more quickly lost, and the heat dissipation performance of the control cabinet is further improved; the radiating pipes communicated with the outside are arranged on two sides of the rectangular cabinet body below the chamfered table-shaped cabinet body, and the opening directions of the radiating pipes are upward, so that hot air is easier to be discharged from the inside of the control cabinet through the radiating pipes, and the radiating performance of the control cabinet is further improved;

in embodiment 1, the horizontal damping device comprises a damping sleeve 40 and a connecting rod 41, wherein the bottom of the damping sleeve 40 is fixed on the inner side wall of the base 2; a damping spring 42 is arranged in the damping sleeve 40, and one end of the connecting rod 41 is fixedly connected with a damping pressing block 43 corresponding to the damping spring 42; the other end of the connecting rod 41 is fixedly connected with the outer side wall of the rectangular cabinet 10. The vibrations energy transmission that the switch board produced in the horizontal direction can be given and transmitted on shock attenuation briquetting and damping spring through the connecting rod, finally is absorbed on the inside wall of the bottom of transmitting the shock attenuation telescopic with the vibrations energy transmission and base, realizes that the vibrations energy that the switch board produced is absorbed on the horizontal direction.

In embodiment 1, the vertical shock absorbing device includes a metal elastic plate 50 and a buffer spring 51; two ends of the metal elastic plate 50 are respectively connected with the inner side wall of the base 2; the arc-shaped upper end surface of the metal elastic plate 51 is contacted with the lower end of the support plate 3; the horizontal bottom of metal elastic plate 50 is connected with the horizontal bottom surface of base 2, and buffer spring 51's upper end and metal elastic plate 50's arc bottom surface fixed connection, and buffer spring 51's lower extreme and base 2's horizontal bottom surface fixed connection. The vibration energy that the switch board produced on vertical direction passes through the backup pad and transmits for metal elastic plate, and metal elastic plate absorbs partly vibration energy through deformation, can oppress buffer spring at the in-process that metal elastic plate warp, makes buffer spring take place deformation, absorbs partly vibration energy when buffer spring deformation, realizes the absorption of switch board vibration energy in vertical direction.

In embodiment 1, the number of the metal elastic plates 50 is set to be plural, and the plural metal elastic plates 50 are connected by the fixing member 501. The ability of the metal elastic plate to absorb shock energy can be enhanced.

In embodiment 1, the front surface of the movable cabinet door 6 is provided with an electronic lock, and the electronic lock comprises a coded lock 60 and a fingerprint lock 61. The cabinet doors are opened in two ways, and when one of the two ways cannot be used, the cabinet door can be opened in the other way to overhaul the control cabinet; meanwhile, the safety of the control cabinet can be guaranteed by arranging the electronic lock, and the cabinet door is prevented from being opened randomly.

As shown in fig. 3, embodiment 2 of the present invention discloses a control method for electric precipitation, including the following steps:

step 1: analog quantity signals of primary voltage, current, secondary voltage, current, turbidity and the like of the transformer are acquired by the data acquisition circuit and are sent to a CPU (central processing unit) through a PLC (programmable logic controller) analog quantity module for calculation processing;

step 2: switching value signals of transformer oil temperature, oil level bias excitation and the like are sent to a CPU for processing through PLC digital value input signals;

and step 3: the PLC controller reads in all analog quantity and digital quantity signals input to the CPU in sequence, carries out corresponding processing through an algorithm, generates two paths of trigger pulses according to the result obtained by processing, sends the two paths of trigger pulses to the main loop silicon controlled voltage regulator, and controls the primary voltage of the transformer by adjusting the conduction angle of the silicon controlled voltage, thereby controlling the input electric field voltage and improving the dust removal efficiency;

and 4, step 4: the secondary current is rectified by the rectifier and then is sent to the dust remover body, and the three processes are repeated to form a control loop.

By taking the PLC as a control center, primary voltage current, secondary current and voltage of the transformer are acquired by a data acquisition circuit and are sent to a CPU (central processing unit) through a PLC analog input module as analog quantities; bias excitation is sent to a CPU as a digital quantity signal; the CPU calculates and processes the sent signal, outputs trigger pulse to the silicon controlled trigger circuit, controls the primary voltage of the transformer by adjusting the conduction angle of the silicon controlled, thereby adjusting the voltage of the electric field, and simultaneously, the secondary current of the transformer is rectified by the rectifier and then is sent to the dust remover, so that the dust remover keeps higher dust removal efficiency.

In order to realize the interaction between the dust removal control related data and the control terminal and realize the remote control through the control terminal, in embodiment 2, the control terminal is connected with a plurality of alarms, and the control terminal is provided with a human-computer interaction interface. The man-machine interaction interface displays data and keys in operation instructions. And when the data is abnormal, the alarm can be used for alarming.

Finally, only specific embodiments of the present invention have been described in detail above. The invention is not limited to the specific embodiments described above. Equivalent modifications and substitutions by those skilled in the art are also within the scope of the present invention. Accordingly, equivalent alterations and modifications are intended to be included within the scope of the invention, without departing from the spirit and scope of the invention.