Signal collecting device for special gas detector

Abstract

The utility model relates to the technical field of analog signal acquisition, solves the problems of large wiring work amount, high cost and difficult troubleshooting and maintenance caused by a large number of communication lines required for signal acquisition of a special gas detector in the prior art, and discloses a special gas detector signal acquisition device which comprises a mainboard, the main board is provided with a signal output end, a 485 communication chip, a single-chip microcomputer and a plurality of first signal input ends. Analog quantity signals and dry contact signals of a plurality of special gas detectors can be integrated and converted into digital signals through the single-chip microcomputer; therefore, signal transmission between a plurality of special gas detectors and the signal collection equipment can be realized by using one two-core cable, so that the cable cost required by implementation, the engineering quantity of construction and the construction difficulty can be greatly reduced, and the number of the cables is greatly reduced.

Description

Technical Field

[0001] This application relates to the technical field of analog signal acquisition, and in particular to a signal collection device for a special gas detector. Background Art

[0002] Special gas is the abbreviation of special gas. Special gas refers to the gas that appears in some industrial occasions. Generally, special gas can be divided into the following three categories: The first category is non-flammable and non-toxic inorganic gases, such as CO2, N2, inert gases, etc.; The second category is flammable or toxic inorganic gases, such as H2, CO, NO, HCl, H2S, SO2, Cl2, etc.; The third category is organic gases (vapors), such as methane, ethanol. The above three types of gases all belong to special gases, and the detectors used to detect these gases are called special gas detectors.

[0003] The installation feature of the special gas detector is that multiple special gas detectors are installed together. Each special gas detector includes 1 analog concentration signal, 1 switch quantity first-level alarm signal, 1 switch quantity second-level alarm signal, and 1 switch quantity fault signal. When transmitting the above signals in the special gas detector to the signal acquisition terminal, taking the PLC controller as an example of the signal acquisition terminal: eight analog signal communication lines are required between one special gas detector and the PLC controller. In the case of multiple special gas detectors installed together, this undoubtedly makes the number of communication lines between the special gas detector and the PLC controller numerous. Not only is the wiring project volume large, the difficulty is high, and the cost is high, but also when a communication line fails, it is difficult to carry out the troubleshooting and maintenance work of the communication line. Summary of the Utility Model

[0004] The purpose of this application is to overcome the problems of large wiring project volume, high cost, and difficult fault troubleshooting and maintenance caused by the large number of communication lines required for signal collection of special gas detectors in the prior art, and provides a signal collection device for a special gas detector, including a main board, on which a signal output terminal, a 485 communication chip, a single-chip microcomputer, and multiple first signal input terminals are provided. The signal output terminal is connected to the output terminal of the 485 communication chip, the output terminal of the single-chip microcomputer is connected to the input terminal of the 485 communication chip, and the first signal input terminals are all connected to the single-chip microcomputer.

[0005] In some possible implementation manners, the first signal input terminals include a concentration signal input terminal, a first-level alarm signal input terminal, a second-level alarm signal input terminal, and a fault signal input terminal. Among them, the concentration signal input terminal is used to input the concentration signal of the special gas detector, and the first-level alarm signal input terminal, the second-level alarm signal input terminal, and the fault signal input terminal are respectively used to input the first-level alarm signal, the second-level alarm signal, and the fault signal.

[0006] In some possible implementation manners, the first-level alarm signal, the second-level alarm signal, and the fault signal are input into the single-chip microcomputer in the form of dry contact signals, and the concentration signal is input into the single-chip microcomputer in the form of an analog signal. The special gas detector transmits the detected concentration to the single-chip microcomputer in the form of an analog signal. Additionally, when the concentration reaches the first-level alarm concentration, the first-level alarm is triggered, and the corresponding dry contact closes; when the concentration reaches the second-level alarm, the second-level alarm is triggered, and the corresponding dry contact closes; when the detector itself has a fault, the fault alarm is triggered, and the corresponding dry contact closes. Each signal is transmitted to the single-chip microcomputer, and the single-chip microcomputer classifies and encodes the data into digital signals and stores them in the storage area. Then, the 485 communication chip processes and sends the digital signals to the signal acquisition terminal.

[0007] In some possible implementation manners, a power input terminal and a plurality of first power output terminals are further provided on the main board. The first power output terminals are all connected to the power input terminal. Among them, the power input terminal is used to obtain power from the signal acquisition terminal or other power supply devices, and the first power output terminal is used to supply power to the special gas detector.

[0008] In some possible implementation manners, an expansion interface is further provided on the main board. The expansion interface includes a second power output terminal and a second signal input terminal. The second power output terminal is connected to the power input terminal, and the second signal input terminal is connected to the input terminal of the 485 communication chip. Since the number of pins of the single-chip microcomputer configured in one main board is limited, the number of special gas detectors that can be connected is limited. By using the expansion interface, other main boards can be connected, thereby realizing the connection of multiple main boards and further being able to connect more special gas detectors.

[0009] In some possible implementation manners, the power input terminal, the first power output terminal, and the second power output terminal all include a positive contact and a negative contact. Among them, the positive contacts of the power input terminal, the first power output terminal, and the second power output terminal are connected together, and the negative contacts of the power input terminal, the first power output terminal, and the second power output terminal are connected together.

[0010] In some possible implementation manners, the power input terminal and the signal output terminal are connected to the expansion interface of the signal acquisition terminal or other main boards. The power input terminal and the signal output terminal are connected to the signal acquisition terminal, which is used to transmit the signals of the special gas detectors connected to the main board to the signal acquisition terminal and obtain power from the signal acquisition terminal. The power input terminal and the signal output terminal are connected to the expansion interface of other main boards, which is used to transmit the signals of the special gas detectors connected to the main board to other main boards, and then directly or indirectly transmit the signals to the signal acquisition terminal through other main boards and obtain power from other main boards.

[0011] In some possible implementation manners, the power input end is connected to the power supply end of the signal acquisition terminal or the second power output end of another main board, for taking power from the signal acquisition terminal or another main board. The signal output end is connected to the input end of the signal acquisition terminal or the second signal input end of another main board, for transmitting the signals of the special gas detector collected to the signal acquisition terminal or transmitting them to the signal acquisition terminal through another main board.

[0012] The present application has the following beneficial effects: In the present application, the analog signals and dry contact signals of multiple special gas detectors can be centralized and converted into digital signals by a single-chip microcomputer, so as to realize the signal transmission between multiple special gas detectors and the signal collection device by using a two-(four-core cable, where two cores are for power supply and the other two cores are for signals) core cable, which can greatly reduce the cable cost required for implementation, the engineering quantity and the construction difficulty of the construction. Moreover, due to the substantial reduction in the number of cables, it is easier to repair cable faults. In addition, the number of analog channels of the signal acquisition terminal is also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application.

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 is a schematic structural diagram of the special gas detector signal collection device according to the embodiment of the present application;

[0016] Figure 2 is Figure 1 a partial enlarged view of part A in

[0017] Figure 3 is a schematic structural diagram of two connected special gas detector signal collection devices according to the embodiment of the present application.

[0018] Reference numerals:

[0019] 1. Main board; 2. Signal output terminal; 3. 485 communication chip; 4. Single-chip microcomputer; 5. First signal input terminal; 51. Concentration signal input terminal; 52. First-level alarm signal input terminal; 53. Second-level alarm signal input terminal; 54. Fault signal input terminal; 6. Expansion interface; 61. Second power output terminal; 62. Second signal input terminal; 7. Signal acquisition terminal; 8. Power input terminal; 9. First power output terminal; 10. Positive contact; 11. Negative contact; 12. Special gas detector. Detailed implementation manner

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application; obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0021] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0022] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0023] Embodiment

[0024] Please refer to Figure 1 , a preferred embodiment of the present application, a special gas detector signal collection device, including a main board 1, on which a signal output terminal 2, a 485 communication chip 3, a single-chip microcomputer 4 and a plurality of first signal input terminals 5 are provided. The signal output terminal 2 is connected to the output terminal of the 485 communication chip 3, the output terminal of the single-chip microcomputer 4 is connected to the input terminal of the 485 communication chip 3, and the first signal input terminals 5 are all connected to the single-chip microcomputer 4.

[0025] As Figure 2 shown, the first signal input terminal 5 includes a concentration signal input terminal 51, a first-level alarm signal input terminal 52, a second-level alarm signal input terminal 53, and a fault signal input terminal 54. Among them, the concentration signal input terminal 51 is used to input the concentration signal of the special gas detector 12, and the first-level alarm signal input terminal 52, the second-level alarm signal input terminal 53, and the fault signal input terminal 54 are respectively used to input the first-level alarm signal, the second-level alarm signal, and the fault signal. During use, the first-level alarm signal, the second-level alarm signal, and the fault signal of the special gas detector 12 are input into the single-chip microcomputer 4 in the form of dry contact signals, and the concentration signal of the special gas detector 12 is input into the single-chip microcomputer 4 in the form of an analog signal. The special gas detector 12 transmits the detected concentration to the single-chip microcomputer 4 in the form of an analog signal. In addition, when the concentration reaches the first-level alarm concentration, the first-level alarm is triggered and the corresponding dry contact is closed; when the concentration reaches the second-level alarm, the second-level alarm is triggered and the corresponding dry contact is closed; when the detector itself has a fault, the fault alarm is triggered and the corresponding dry contact is closed. Each signal is transmitted to the single-chip microcomputer 4, and the single-chip microcomputer 4 classifies and encodes the data into digital signals and places them in the storage area, and then the 485 communication chip 3 processes and sends the digital signals to the signal acquisition terminal 7. The signal acquisition terminal 7 identifies which special gas detector 12 the signal comes from according to the 485 occupancy dial code and the unique identification code of the special gas detector 12. Exemplarily, the signal acquisition terminal 7 can be a PLC controller, a PLC control cabinet, etc.

[0026] In the above embodiment, the analog signals and dry contact signals of multiple special gas detectors 12 can be concentrated and converted into digital signals by the single-chip microcomputer 4, so that the signal transmission between multiple special gas detectors 12 and the signal collection device can be realized by using a two-(four-core cable, where two cores are for power supply and the other two cores are for signals) core cable, which can greatly reduce the cable cost, the construction workload, and the construction difficulty required for implementation. Moreover, due to the significant reduction in the number of cables, it is easier to repair cable faults.

[0027] To supply power to the special gas detector 12, a power input terminal 8 and multiple first power output terminals 9 are further provided on the main board 1. The first power output terminals 9 are all connected to the power input terminal 8. Among them, the power input terminal 8 is used to obtain power from the signal acquisition end or other power supply devices, and the special gas detector 12 is connected to the first power output terminal 9. The first power output terminal 9 is used to supply power to the special gas detector 12.

[0028] In order to expand the number of special gas detectors 12 that the signal acquisition device can connect, an expansion interface 6 is also provided on the main board 1. The expansion interface 6 includes a second power output terminal 61 and a second signal input terminal 62. The second power output terminal 61 is connected to the power input terminal 8, and the second signal input terminal 62 is connected to the input terminal of the 485 communication chip 3. Since the number of pins of the single-chip microcomputer 4 configured in one main board 1 is limited, the number of special gas detectors 12 that can be connected is limited. By using the expansion interface 6, other main boards 1 can be connected, so as to realize the connection of multiple main boards 1, and further more special gas detectors 12 can be connected.

[0029] Since a power supply usually includes a positive pole and a negative pole, the power input terminal 8, the first power output terminal 9, and the second power output terminal 61 all include a positive contact 10 and a negative contact 11. Among them, the positive contacts 10 of the power input terminal 8, the first power output terminal 9, and the second power output terminal 61 are connected together, and the negative poles of the power input terminal 8, the first power output terminal 9, and the second power output terminal 61 are connected together.

[0030] In a possible embodiment, as Figure 1 shown, the power input terminal 8 and the signal output terminal 2 are connected to the signal acquisition terminal 7, so as to realize the transmission of the signals of the special gas detectors 12 connected to the main board 1 to the signal acquisition terminal 7, and draw power from the signal acquisition terminal 7.

[0031] Specifically, the power input terminal 8 is connected to the power supply terminal of the signal acquisition terminal 7 to realize drawing power from the signal acquisition terminal 7, and the signal output terminal 2 is connected to the input terminal of the signal acquisition terminal 7 to realize transmitting the signals of the collected special gas detectors 12 to the signal acquisition terminal 7. When in use, the special gas detectors 12 detect various gases, suck the gas at the sampling point where there may be gas leakage into the detector body through their own pumps, analyze and judge the current gas concentration. When the concentration reaches the first-level alarm concentration, the first-level alarm is triggered and the corresponding dry contact is closed; when the concentration reaches the second-level alarm, the second-level alarm is triggered and the corresponding dry contact is closed; when the detector itself has a fault, the fault alarm is triggered and the corresponding dry contact is closed. Each signal is transmitted to the single-chip microcomputer 4, and the single-chip microcomputer 4 classifies and stores the data in the storage area, and then the 485 communication chip 3 processes and sends the data to the signal acquisition terminal 7.

[0032] In another possible embodiment, as Figure 3 shown, the power input terminal 8 and the signal output terminal 2 are connected to the expansion interface 6 of other main boards 1, so as to realize the transmission of the signals of the special gas detectors 12 connected to the main board 1 to other main boards 1, and then directly or indirectly transmit the signals to the signal acquisition terminal 7 through other main boards 1, and draw power from other main boards 1, so that the signal acquisition terminal 7 can collect the signals of more special gas detectors 12.

[0033] Specifically, the power input terminal 8 is connected to the second power output terminal 61 of another main board 1 for obtaining power from the other main board 1. The signal output terminal 2 is connected to the second signal input terminal 62 of the other main board 1 for transmitting the signals of the gas detectors 12 collected through the other main board 1 to the signal acquisition terminal 7. Among them, the power input terminal 8 and the signal output terminal 2 of the other main board 1 are connected to the signal acquisition terminal 7, enabling the other main board 1 to obtain power from the signal acquisition terminal 7 and transmit the signals of the gas detectors 12 to the signal acquisition terminal 7. In the above embodiment, one main board 1 can be connected to six gas detectors 12. In this embodiment, by expanding one main board 1, the signal acquisition terminal 7 can simultaneously collect the signals of twelve gas detectors 12, doubling the number of gas detectors 12 that can be collected. Similarly, further expansion can be continued. In this way, the signals of the gas detectors 12 connected to multiple main boards 1 can be transmitted to the signal acquisition terminal 7 through a two-core signal line, and the gas detectors 12 can be powered through a two-core power line. In this way, the signal collection and power supply functions between the signal acquisition terminal 7 and the gas detectors 12 can be realized by using a four-core cable, which can greatly reduce the cable cost, the construction workload, and the construction difficulty required for implementation. Moreover, since the number of cables is greatly reduced, it is easier to repair cable faults. In addition, the number of analog channels of the signal acquisition terminal is also reduced.

[0034] This application separately converts the signals of multiple gas detectors 12 (each gas detector 12 includes one analog concentration signal, one digital quantity first-level alarm signal, one digital quantity second-level alarm signal, and one digital quantity fault signal) into one 32-bit digital signal. Through one 4-core cable (2 power lines and 2 communication signal lines), the signal transmission and power supply between multiple detectors and the signal acquisition terminal 7 can be realized, which can greatly reduce the cable cost, the construction workload, and the construction difficulty required for implementation. At the same time, due to the reduction in the number of cables, it is more convenient to repair cable faults. In addition, the number of analog channels in the signal acquisition terminal 7 is also reduced. That is, one 485 communication module (the value is generally less than half of the analog module) of the signal acquisition terminal 7 can at least collect data from 15 stations (i.e., 15 main boards 1). According to each station (i.e., the main board 1) being connected to six gas detectors 12, one 485 communication module of the signal acquisition terminal 7 can be connected to a total of 90 gas detectors 12 to realize the signal acquisition of 90 gas detectors 12. Converted to the data of an 8-channel analog module, 90 / 8 = 11.25 pieces. That is to say, to realize the signal acquisition of 90 gas detectors 12, one 485 communication module is equivalent to 11.25 pieces of analog modules.

[0035] The above is only a preferred specific embodiment of the present application; however, the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application, making equivalent substitutions or changes according to the technical solution of the present application and its improved conceptions, shall be covered by the protection scope of the present application.

Claims

1. A signal collection device for a special gas detector, characterized in that: It includes a main board, on which a signal output terminal, a 485 communication chip, a single-chip microcomputer and a plurality of first signal input terminals are arranged. The signal output terminal is connected to the output terminal of the 485 communication chip, the output terminal of the single-chip microcomputer is connected to the input terminal of the 485 communication chip, and the first signal input terminals are all connected to the single-chip microcomputer.

2. The signal collection device for special gas detector according to claim 1, characterized in that: The first signal input terminal includes a concentration signal input terminal, a first-level alarm signal input terminal, a second-level alarm signal input terminal and a fault signal input terminal.

3. The signal collection device for special gas detector according to claim 2, characterized in that: The first-level alarm signal, the second-level alarm signal and the fault signal are input into the single-chip microcomputer in the form of dry contact signals, and the concentration signal is input into the single-chip microcomputer in the form of analog signals.

4. The signal collection device for a special gas detector according to any one of claims 1 to 3, characterized in that: The main board is also provided with a power input terminal and a plurality of first power output terminals, and the first power output terminals are all connected to the power input terminal.

5. The signal collection device for special gas detector according to claim 4, characterized in that: The mainboard is also provided with an expansion interface, which includes a second power output terminal and a second signal input terminal, the second power output terminal is connected to the power input terminal, and the second signal input terminal is connected to the input terminal of the 485 communication chip.

6. The signal collection device for special gas detector according to claim 5, characterized in that: The power input terminal, the first power output terminal and the second power output terminal all include a positive electrode contact and a negative electrode contact.

7. The signal collection device for special gas detector according to claim 5, characterized in that: The power input terminal and the signal output terminal are connected to the expansion interface of the signal acquisition terminal or other mainboards.

8. The signal collection device for special gas detector according to claim 7, characterized in that: The power input end is connected to the power supply end of the signal acquisition terminal or the second power output end of other mainboards, and the signal output end is connected to the input end of the signal acquisition terminal or the second signal input end of other mainboards.

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