CN114924509A - Multi-signal gas isolation device based on CAN bus - Google Patents

Abstract

The invention discloses a multi-signal gas isolation device based on CAN bus, comprising: a casing, a core control module, a CAN isolation module, an AIN conversion module, a DIN conversion module, a power supply module and a relay output module arranged in the casing; The isolation module, AIN conversion module, DIN conversion module, power supply module and relay output module are respectively connected with the core control module; the AIN conversion module is used to receive the analog signal of the gas sensor, and convert the analog signal and send it to the core control module; The DIN conversion module is used to receive digital signal, frequency signal and serial port signal, and send the signal to the core control module after conversion. When the core control module detects that the input signal is a digital signal, it controls the relay output module to perform switching actions; the core control The module is also used to send data to the upper computer or control system through the CAN isolation module. The device is suitable for many different types of gas sensors and has a wide range of applications.

Description

Multi-signal gas isolation device based on CAN bus

technical field

The invention relates to the technical field of coal mining machinery, in particular to a multi-signal gas isolation device based on a CAN bus.

Background technique

At present, the coal shearer uses a gas sensor and a gas disconnection meter to monitor the gas signal. The gas disconnection meter detects and processes the gas signal and outputs the switch signal through the relay. The shearer control system detects the gas disconnection The switch signal of the electric meter judges whether the gas exceeds the limit.

At present, there are many types of gas sensors, and the signal output types include 485 signals, frequency signals, current signals, voltage signals, etc. The use needs to be matched with different types of gas disconnection meters, and the use is not uniform. With the demand for the intelligent development of coal mines, the electrical system is required to display the gas sensor concentration, which not only has the gas over-limit fault to block the shearer, but also has the ability to coordinately control the speed of the scraper conveyor through the gas concentration, so the gas power outage meter with switch output It can no longer meet its usage requirements.

SUMMARY OF THE INVENTION

In order to solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides a multi-signal gas isolation device based on CAN bus. The technical solution is as follows:

Provided is a multi-signal gas isolation device based on CAN bus, comprising: a housing, and a core control module, a CAN isolation module, an AIN conversion module, a DIN conversion module, a power supply module and a relay output module arranged in the housing; the CAN The isolation module, the AIN conversion module, the DIN conversion module, the power supply module and the relay output module are respectively connected with the core control module; the AIN conversion module is used to receive the analog signal of the gas sensor, and The analog signal is converted and sent to the core control module; the DIN conversion module is used to receive switch signal, frequency signal and serial port signal, and the signal is converted and sent to the core control module, the core control module When it is detected that the input signal is a digital signal, the relay output module is controlled to perform a switching action; the core control module is also used for sending data to a host computer or a control system through the CAN isolation module.

In some optional implementations, the AIN conversion module includes an ADC interface, HCPL7800 and LMC6482AIN chips, the ADC interface is connected to the HCPL7800 and LMC6482AIN chips, and the HCPL7800 and LMC6482AIN chips are connected to the core control module,

The ADC interface is used to collect analog signals, and the HCPL7800 and LMC6482AIN chips are used to convert 1-5mA analog signals into 0-3.3V voltage signals that the core control module can recognize and send to the core control module .

In some optional implementations, the DIN conversion module includes a 6N137 optocoupler isolation chip and a FIN pin, the FIN pin is connected to the 6N137 optocoupler isolation chip, and the 6N137 optocoupler isolation chip is connected to the 6N137 optocoupler isolation chip. The core control module is connected; the FIN pin is used to access switch signal, frequency signal and serial port signal, and the 6N137 optocoupler isolation chip converts the signal and sends it to the core control module.

In some optional implementation manners, the relay output module includes at least one set of normally open and normally closed points, and the core control module switches the opening and closing of the normally open and normally closed points when recognizing that the access signal is a digital signal. closed state.

In some optional implementation manners, the power module is powered by intrinsically safe 12V or non-intrinsically safe 24V.

In some optional implementation manners, the CAN isolation module includes a CTM1051/CTM1051A chip with an isolation function and an interface with its own magnetic coupling isolation.

In some optional implementations, the core control module includes an STM32 microcontroller circuit and 36 pins.

In some optional implementation manners, an indicator light for indicating a running state is provided on the housing.

In some optional implementations, the indicator light includes a first indicator light for indicating the normal operation of the CAN isolation module, a second indicator light for indicating the normal operation of the AIN conversion module, and a second indicator light for indicating the normal operation of the CAN isolation module. The third indicator light for the normal operation of the DIN conversion module, the fourth indicator light for indicating the normal operation of the power supply module, and the fifth indicator light for indicating the normal operation of the relay output module.

In some optional implementations, the housing is fixed in the explosion-proof electrical control box by bolts or rails.

The main advantages of the technical solution of the present invention are as follows:

The multi-signal gas isolation device based on the CAN bus provided by the present invention can collect various signals, automatically determine the type of the signals and perform corresponding operations, is suitable for a variety of different types of gas sensors, is compatible with the function of a gas disconnection meter, and has a wide range of applications .

Description of drawings

The accompanying drawings described herein are used to provide further understanding of the embodiments of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic diagram of the connection of a multi-signal gas isolation device based on a CAN bus provided by an embodiment of the present invention;

2 is a schematic diagram of the connection relationship of each module inside the CAN bus-based multi-signal gas isolation device provided by an embodiment of the present invention;

3 is a schematic front view of a circuit board in a CAN bus-based multi-signal gas isolation device according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the reverse side of the circuit board in the multi-signal gas isolation device based on the CAN bus according to an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

An embodiment of the present invention provides a multi-signal gas isolation device based on a CAN bus, as shown in FIG. 1 and FIG. 2 , comprising: a casing, and a core control module, a CAN isolation module, and an AIN conversion module arranged in the casing , DIN conversion module, power supply module and relay output module, CAN isolation module, AIN conversion module, DIN conversion module, power supply module and relay output module are respectively connected with the core control module; AIN conversion module is used to receive the analog signal of the gas sensor, The analog signal is converted and sent to the core control module; the DIN conversion module is used to receive switch signal, frequency signal and serial port signal, and convert the signal and send it to the core control module. The core control module detects that the input signal is a switch When the signal is received, the relay output module is controlled to perform switching actions; the core control module is also used to send data to the upper computer or control system through the CAN isolation module.

When in use, when the signal of the gas sensor is connected through the AIN conversion module, the core control module automatically recognizes it as an analog signal, and can send the signal to the CAN bus through the CAN isolation module and then to the host computer or control system. When the signal of the gas sensor is connected through the DIN conversion module, it may be a digital signal, a frequency signal and a serial port signal, and the core control module identifies the signal type. If it is detected as a switch signal, the core control module controls the relay output module to switch on and off, and sends the corresponding data to the CAN bus. If it is detected as a frequency signal, the core control module obtains the gas signal value corresponding to the frequency signal, and sends the data to the CAN bus. If it is detected as a serial port signal, the core control module parses the serial port signal, obtains valid data and sends it to the CAN bus.

It can be seen that the CAN bus-based multi-signal gas isolation device provided by the embodiment of the present invention can collect various signals, automatically determine the signal type and perform corresponding operations, and is suitable for various types of gas sensors. In addition, it is connected to the control system through CAN bus so that the control system can read the gas data and convert the gas concentration for display. The control system then sends the gas data to the coal mine underground centralized control center for cooperative control of the speed of the scraper conveyor. In addition, the relay output can be performed according to the switching value, which is compatible with the function of the gas disconnection meter, and has a wide range of applications.

Optionally, the AIN conversion module may include an ADC interface, HCPL7800 and LMC6482AIN chips, the ADC interface is connected to the HCPL7800 and LMC6482AIN chips, the HCPL7800 and LMC6482AIN chips are connected to the core control module, and analog signals are collected through the ADC interface. The isolation and amplification of the analog signal can convert the 1-5mA analog signal into a 0-3.3V voltage signal that the core control module can recognize and send it to the core control module.

Optionally, the DIN conversion module may include a 6N137 optocoupler isolation chip and a FIN pin, the FIN pin is connected to the 6N137 optocoupler isolation chip, and the 6N137 optocoupler isolation chip is connected to the core control module; the signal is connected to the 6N137 through the FIN pin Optocoupler isolation chip, the signal is converted and sent to the core control module. The core control module analyzes the signal and automatically identifies whether the input signal is a frequency, serial port or switch signal.

Optionally, the relay output module includes at least one set of normally open and normally closed points, and the core control module switches the open and closed states of the normally open and normally closed points when recognizing that the access signal is a switch signal, so as to realize the gas power-off function.

Optionally, the power module can be powered by intrinsically safe 12V or non-intrinsically safe 24V.

Optionally, the CAN isolation module includes a CTM1051/CTM1051A chip with isolation function and an interface with its own magnetic coupling isolation. The CTM1051/CTM1051A chip converts the logic level to the differential level of the CAN bus, has the isolation function of DC2500V, realizes the isolation design of intrinsic safety and non-intrinsic safety, and improves safety. The core control module realizes CAN communication with the host computer or control system through the CAN isolation module. The sent data is mapped and configured by the user using the CANOPEN protocol, and the detection data, relay status and other data can be transmitted to the upper end through heat preservation.

Optionally, the core control module (ie, CPU) may include an STM32 single-chip microcomputer circuit and 36 pins to connect with various components to realize power control and data scheduling functions.

Optionally, an indicator light for indicating the operating state is provided on the housing, and the operating state of the gas isolation device can be easily learned quickly through the indicator light.

Specifically, the indicator lights include a first indicator light for indicating the normal operation of the CAN isolation module, a second indicator light for indicating the normal operation of the AIN conversion module, a third indicator light for indicating the normal operation of the DIN conversion module, and a second indicator light for indicating the normal operation of the AIN conversion module. The fourth indicator light for indicating the normal operation of the power supply module and the fifth indicator light for indicating the normal operation of the relay output module. For example, when AIN is on, it means that the analog quantity is connected; when DIN is on, it means access frequency, switch value, and serial port signal; when RUN is on, it means the device is running normally; when RL is on, it means the terminal resistance is connected; The relay output module works.

Optionally, the housing is fixed in the explosion-proof electric control box by bolts or clamping rails. For example, a plurality of fixing holes may be provided on the casing, and bolts pass through the fixing holes to fix the casing in the explosion-proof electric control box. For another example, the casing and the inner wall of the explosion-proof electric control box are respectively provided with matching rails, and the casing is fixed in the explosion-proof electric control box by means of clamping.

The casing can be made of plastic material, and is provided with a circuit board. The core control module, the AIN conversion module, the CAN isolation module, the DIN conversion module, the relay output module and each indicator light can be arranged on the circuit. The schematic diagrams of the front and the back of the circuit board can be seen in Fig. 3 and Fig. 4, respectively. Since only one circuit board needs to be accommodated inside, the overall volume of the gas isolation device is small.

It should be noted that, in this document, relational terms such as "first" and "second" etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these There is no such actual relationship or sequence between entities or operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are all referred to the placement state shown in the accompanying drawings.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A multi-signal gas isolation device based on a CAN bus is characterized by comprising: the device comprises a shell, and a core control module, a CAN isolation module, an AIN conversion module, a DIN conversion module, a power supply module and a relay output module which are arranged in the shell;

the CAN isolation module, the AIN conversion module, the DIN conversion module, the power supply module and the relay output module are respectively connected with the core control module;

the AIN conversion module is used for receiving an analog quantity signal of the gas sensor, converting the analog quantity signal and then sending the converted analog quantity signal to the core control module;

the DIN conversion module is used for receiving the switching value signal, the frequency signal and the serial port signal, converting the signals and then sending the converted signals to the core control module, and when the core control module detects that the input signal is the switching value signal, controlling the relay output module to perform switching action;

the core control module is also used for sending data to an upper computer or a control system through the CAN isolation module.

2. The CAN-bus-based multi-signal gas isolation device according to claim 1, wherein the AIN conversion module comprises an ADC interface, HCPL7800 and LMC6482AIN chips, the ADC interface is connected with the HCPL7800 and LMC6482AIN chips, the HCPL7800 and LMC6482AIN chips are connected with the core control module, the ADC interface is used for collecting analog quantity signals, and the HCPL7800 and LMC6482AIN chips are used for converting the analog quantity signals of 1-5mA into voltage signals of 0-3.3V which CAN be identified by the core control module and sending the voltage signals to the core control module.

3. The CAN-bus-based multi-signal gas isolation device according to claim 1, wherein the DIN conversion module comprises a 6N137 optically coupled isolation chip and a FIN pin, the FIN pin is connected with the 6N137 optically coupled isolation chip, and the 6N137 optically coupled isolation chip is connected with the core control module; the FIN pin is used for accessing a switching value signal, a frequency signal and a serial port signal, and the 6N137 optical coupling isolation chip converts the signals and then sends the converted signals to the core control module.

4. The CAN-bus-based multi-signal gas isolating device as claimed in claim 1, wherein the relay output module comprises at least one set of normally open and normally closed points, and the core control module switches the open and closed states of the normally open and normally closed points when recognizing that the access signal is a switching value signal.

5. The CAN bus based multi-signal gas isolation device of claim 1, wherein the power module is powered by either intrinsically safe 12V or non-intrinsically safe 24V.

6. The CAN bus-based multi-signal gas isolation device of claim 1, wherein the CAN isolation module comprises a CTM1051/CTM1051A chip with isolation function and an interface with self-coupled isolation.

7. The CAN bus based multi-signal gas isolation device of claim 1, wherein the core control module comprises STM32 single chip circuit and 36 pins.

8. The CAN bus based multi-signal gas isolation device of claim 1, wherein an indicator light is provided on the housing for indicating an operational status.

9. The CAN bus based multi-signal gas isolation device of claim 8, wherein the indicator lights comprise a first indicator light for indicating a normal operation of the CAN isolation module, a second indicator light for indicating a normal operation of the AIN conversion module, a third indicator light for indicating a normal operation of the DIN conversion module, a fourth indicator light for indicating a normal operation of the power module, and a fifth indicator light for indicating a normal operation of the relay output module.

10. The CAN bus based multi-signal gas isolation device of claim 1, wherein the housing is secured within an explosion proof electrical cabinet by bolts or clamping rails.

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