Multi-path pluggable modular transmitter capable of being overhauled on line

Abstract

A plurality of independent signal processing modules are arranged on a main board, each independent signal processing module is matched with an online overhauling module and an input and output module, and each independent signal processing module corresponds to a to-be-processed sensor signal; the signal processing module comprises a base and a pluggable transmitting module plugged on the base, and a processing circuit of the sensor signal is modularly packaged in the pluggable transmitting module; the on-line maintenance module provides mode switching, performs normal signal processing in a working mode, and identifies and detects a sensor signal or a fault of the pluggable transmitting module in a maintenance mode; the input and output module supplies power to the pluggable transmitting module and outputs and detects signals. According to the invention, modularization and standardization of the signal processing unit of the transmitter are realized, and rapid plugging can be realized; multiple sensor signals do not influence one another, the on-line maintenance function is achieved to position a fault source, the rapid current detection terminal is arranged, and maintenance and use of the transmitter are greatly facilitated.

Description

Technical Field

[0001] The invention relates to the field of signal detection, in particular to a multi-channel pluggable modular transmitter capable of online maintenance. Background Art

[0002] In a composite sensor, the transmitter needs to process multiple sensor signals, such as temperature, level, pressure, etc. The usual processing method is to implement all functions on a whole circuit board. In this way, if a certain signal is abnormal, the entire circuit board needs to be replaced, which not only increases the cost, but also during the replacement, other sensors cannot work normally. At the same time, in order to minimize the impact of maintenance on production, the transmitter is required to have an online maintenance function. In addition, in order to facilitate maintenance and testing, a quick test terminal needs to be provided. Summary of the invention

[0003] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art, to provide a multi-channel pluggable modular transmitter that can be repaired online, to modularly package each channel of sensor signal processing circuit, to be independent of each other, to share a common mainboard, to be quickly pluggable, and to facilitate replacement and repair. At the same time, the online repair function is realized, and a convenient test terminal is provided for each channel of signal.

[0004] The technical solution of the present invention is: a multi-channel pluggable modular transmitter capable of online maintenance, comprising a transmitter housing and a mainboard fixed inside the housing, wherein a plurality of independent signal processing modules are arranged on the mainboard, each signal processing module is matched with an online maintenance module and an input / output module, and each corresponds to a sensor signal to be processed;

[0005] The signal processing module includes a base connected to the mainboard and a pluggable transmitter module plugged into the base. The processing circuit of the sensor signal is modularly encapsulated in the pluggable transmitter module; the online maintenance module provides a working mode and a maintenance mode switching function. In the working mode, the sensor signal to be processed is transmitted to the pluggable transmitter module for processing. In the maintenance mode, the sensor signal or the pluggable transmitter module fault is identified and detected; the input and output module supplies power to the pluggable transmitter module and completes the processed signal output and signal detection.

[0006] Furthermore, the online maintenance module includes a double-pole double-throw switch and I / O terminals, wherein the I / O terminals include test terminals CS+ and CS-, and working terminals GZ+ and GZ-; two contacts on one side of the double-pole double-throw switch are connected to the working terminals GZ+ and GZ-, and two contacts on the other side are connected to the test terminals CS+ and CS-, and two center contacts are connected to the signal input pins of the base; the sensor signal to be processed is connected to the working terminals GZ+ and GZ-.

[0007] Furthermore, in the working mode, the double-pole double-throw switch is connected to the contacts on the working terminal side, and the sensor signal is transmitted to the pluggable transmitter module through the center contact for signal processing; in the maintenance mode, the double-pole double-throw switch is connected to the contacts on the test terminal side, the sensor signal is disconnected from the pluggable transmitter module, and the sensor signal is detected through the working terminals GZ+ and GZ- to determine whether the sensor is normal, or a standard sensor signal is applied to the test terminals CS+ and CS- to determine whether the pluggable transmitter module is normal.

[0008] Furthermore, the input and output module includes a wiring terminal and a current detection terminal, wherein the wiring terminal includes a signal output terminal and a power supply terminal, the power supply terminal includes a positive terminal V+ and a negative terminal V-, the current detection terminal includes a positive terminal T+ and a negative terminal T-, a diode is connected between the positive terminal T+ and the negative terminal T-, the anode of the diode is connected to the positive terminal T+, and the cathode is connected to the negative terminal T; the negative terminal T- is connected to the negative terminal V- of the power supply terminal, the positive terminal T+ and the positive terminal V+ of the power supply terminal are connected to the power pin of the base, and the signal output terminal is connected to the signal output pin of the base, so as to realize the power supply, processed signal output and signal detection of the pluggable transmitter module.

[0009] Furthermore, the two probes of the ammeter are plugged into the positive and negative terminals T+ and T- of the current detection terminals, and the diode is short-circuited to realize quick detection of the loop current.

[0010] Furthermore, it also includes an explosion-proof connector and input / output cables. The explosion-proof connector is fixed on the transmitter housing, and the input / output cables are introduced into the transmitter housing through the explosion-proof connector. The processed signals of each channel are transmitted back to the wiring terminals in the corresponding input / output module through the base, and then transmitted to the central control end through the input / output cables.

[0011] Furthermore, it includes three signal processing modules, a line maintenance module and an input and output module, which respectively process one level signal, one platinum resistance temperature measurement signal and one thermocouple temperature measurement signal.

[0012] Furthermore, in the signal processing module, the base includes an n-hole socket, an n-pin welding pin, and a base body, and the base is welded to the mainboard through the n-pin welding pin; the pluggable transmitter module includes a module housing, a signal processing circuit and an n-pin plug; the sensor signal to be transmitted is connected to the n-pin plug to provide an external standard interface; the n-pin plug corresponds one-to-one with the n-hole socket and the n-pin welding pin to realize the electrical connection between the mainboard and the pluggable transmitter module; n is determined according to the signal processing requirements.

[0013] Furthermore, the online maintenance module includes a double-pole double-throw switch and I / O terminals; the I / O terminals include test terminals CS+ and CS-, and working terminals GZ+ and GZ-; the double-pole double-throw switch is welded on the mainboard, and its two left contacts are respectively connected to the working terminals GZ+ and GZ- through circuit board wiring; the two right contacts are respectively connected to the test terminals CS+ and CS-; the two center contacts are respectively connected to the corresponding pins of the n-pin base welding pins, and the two signal lines of the sensor are connected to the working terminals GZ+ and GZ-.

[0014] Furthermore, the input-output module includes a wiring terminal and a current detection terminal; the wiring terminal is welded on the mainboard, including a power terminal and a signal output terminal, the power terminal includes a positive terminal V+ and a negative terminal V-; the current detection terminal includes a positive terminal T+ and a negative terminal T-, a diode is connected between the positive terminal T+ and the negative terminal T-, the anode of the diode is connected to the positive terminal T+, and the cathode is connected to the negative terminal T-; the negative terminal T- is connected to the negative terminal V- of the power terminal, the positive terminal T+, the positive terminal V+ of the power terminal and the signal output terminal are connected to the corresponding pins of the n-pin base welding pin, so as to realize the power supply, processed signal output and signal detection of the pluggable transmitter module.

[0015] The advantages of the present invention compared with the prior art are:

[0016] The multi-channel, pluggable, modular transmitter with online maintenance function designed by the present invention realizes modularization and standardization of the transmitter signal processing unit, which can be quickly plugged in and out; and the multi-channel sensor signals do not affect each other. If a signal fails, the problem can be solved by simply replacing the module of that channel. At the same time, the transmitter has an online maintenance function, and the sensor and transmitter can be repaired online separately to locate the source of the fault. In addition, it also has a fast current detection terminal, which can realize loop current detection without powering off and disconnecting cables. It greatly facilitates the maintenance and use of the transmitter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an overall schematic diagram of a transmitter in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the mainboard composition in an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of the signal processing module in an embodiment of the present invention;

[0020] Figure 4 It is a schematic diagram of the composition of the online maintenance module in an embodiment of the present invention;

[0021] Figure 5 Schematic diagram of the composition of input and output modules in an embodiment of the present invention.

[0022] Figure 1 Middle: 1. Transmitter housing; 2. Main board; 3. Explosion-proof connector; 4. Input and output cables;

[0023] Figure 2 Middle: 21. Mainboard; 22. Signal processing module; 23. Online maintenance module; 24. Input and output module;

[0024] Figure 3 Middle: 221, base; 222, pluggable transmitter module; 2211, 8-hole socket; 2212, 8-pin welding pin; 2213, base body; 2221, module housing; 2222, transmitter circuit; 2223, 8-pin plug;

[0025] Figure 4 Middle: 231, double-pole double-throw switch; 232, I / O terminal; 2321 test terminal; 2322, working terminal;

[0026] Figure 5 Middle: 241, connection terminal; 242, current detection terminal. DETAILED DESCRIPTION

[0027] In order to better understand the technical solution of the present invention, the specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. The parts of each structure in the accompanying drawings will be described separately. It is worth noting that the elements not shown in the drawings or not described by words are in a form known to ordinary technicians in the relevant technical field. The description of the embodiments here, any reference to direction and orientation, are only for the convenience of description and should not be understood as limiting the scope of protection of the present invention.

[0028] like Figure 1 As shown, the present invention includes a transmitter housing 1, a mainboard 2, an explosion-proof connector 3, and an input / output cable 4. The mainboard 2 is fixed inside the transmitter housing 1 by screws, the explosion-proof connector 3 is fastened to the transmitter housing 1 by threads, and the input / output cable 4 is introduced into the transmitter housing 1 through the explosion-proof connector 3.

[0029] like Figure 2 As shown, the mainboard 2 includes a mainboard body 21 , a signal processing module 22 , an online maintenance module 23 , and an input / output module 24 .

[0030] like Figure 3As shown, the signal processing module 22 includes a base 221 and a pluggable transmitter module 222; the base 221 is welded on the main board 2; and the pluggable transmitter module 222 is plugged into the base 221. The base 221 includes an 8-hole socket 2211, an 8-pin welding pin 2212, and a base body 2213. The base 221 is welded on the main board 2 through the welding pin 2212. The pluggable transmitter module 222 includes a module housing 2221, a signal processing circuit 2222, and an 8-pin plug 2223. According to different types of signals, the corresponding signal processing circuit is modularly packaged in the module housing 2221, and the signal to be transmitted is connected to the corresponding 8-pin plug 2223 to provide an external standard interface. The 8-pin plug 2223 corresponds to the 8-hole socket 2211 and the 8-pin welding pin 2212 one by one to realize the electrical connection between the main board 2 and the pluggable transmitter module 222.

[0031] like Figure 4 As shown, the online maintenance module 23 includes a double-pole double-throw switch 231 and an I / O terminal 232. The I / O terminal 232 includes a test terminal 2321 (CS+, CS-) and a working terminal 2322 (GZ+, GZ-). The double-pole double-throw switch 231 is welded on the main board 2; its two left contacts are respectively connected to the GZ+ and GZ- of the working terminal 2322 through the circuit board wiring; the two right contacts are respectively connected to the CS+ and CS- of the test terminal 2321; and the two center contacts are respectively connected to the corresponding base welding pins 2212. The two signal lines of the sensor enter the transmitter housing 1 and are connected to the GZ+ and GZ- of the working terminal 2322.

[0032] The principle of online maintenance is as follows: during normal operation, the double-pole double-throw switch 231 is connected to the left contact, so that the sensor signal is transmitted to the corresponding pluggable transmitter module through the center contact for corresponding signal processing. When maintenance is required, just connect the double-pole double-throw switch 231 to the right contact, so that the sensor signal is disconnected from the pluggable transmitter module 222; at this time, the sensor signal can be detected through the GZ+ and GZ- of the working terminal 2322, and it can be used to determine whether the sensor is normal. It is also possible to apply a standard sensor signal to the CS+ and CS- of the test terminal 2321, and use this to determine whether the pluggable transmitter module 222 is normal.

[0033] like Figure 5As shown, the input-output module 24 includes a wiring terminal 241 and a current detection terminal 242. The wiring terminal 241 is welded on the mainboard 2, and includes a power terminal and a corresponding signal output terminal. The current detection terminal 242 includes a positive terminal T+ and a negative terminal T-. A diode is connected between the positive and negative terminals, the anode of the diode is connected to the positive terminal T+, the cathode is connected to the negative terminal T-, and the negative terminal T- is connected to the negative terminal V- of the power supply. The positive terminal V+ of the power terminal, the positive terminal T+ of the current detection terminal 242, and the signal output terminal are connected to the corresponding base welding pin 2212. To realize the power supply and signal output of the pluggable transmitter module 222.

[0034] The principle of current detection is: connect a diode in series on the negative power line of the power loop, which has no effect during normal operation; when the loop current needs to be detected, just plug the two probes of the ammeter into the positive and negative terminals T+ and T- of the current detection terminal 242. Since the internal resistance of the ammeter is theoretically zero, the diode is directly short-circuited, which is equivalent to connecting the ammeter in series in the loop, and the loop current flows back to the negative terminal of the power supply through the ammeter, realizing quick detection of the loop current.

[0035] A specific embodiment of the transmitter proposed by the present invention is given below:

[0036] A temperature and level composite material level meter, the signals that its transmitter needs to process include one level signal, one platinum resistance temperature measurement signal and one thermocouple temperature measurement signal. The level signal is designed as the first channel, the platinum resistance signal is the second channel, and the thermocouple signal is the third channel. The level signal processing circuit, the platinum resistance signal processing circuit, and the thermocouple signal processing circuit are respectively encapsulated as pluggable transmitter modules 222, and plugged into the corresponding base 221. The three-way sensor signal output leads are respectively connected to GZ+ and GZ- of the working terminal 2322. The input and output cables 4 are introduced into the transmitter housing 1 through the explosion-proof connector 3, and the corresponding wire cores are crimped onto the wiring terminals 241.

[0037] The working process of the transmitter is as follows: during normal operation, the power terminal in the wiring terminal 241 supplies power to the pluggable transmitter module 222 through the base 221; the double-pole double-throw switch 231 is thrown to the left working end, and the sensor signal is introduced into the corresponding pluggable transmitter module 222 through the double-pole double-throw switch 231 for processing; after the processing is completed, the 4~20mA current signal and the relay contact signal are transmitted back to the corresponding wiring terminal 241 through the base 221, and transmitted to the central control room through the input and output cable 4.

[0038] When maintenance is required, throw the double-pole double-throw switch 231 to the right test end, so that the sensor signal is disconnected from the pluggable transmitter module 222; at this time, the sensor signal can be detected through the GZ+ and GZ- of the working terminal 2322 to determine whether the sensor is normal; or the standard sensor signal can be applied to the CS+ and CS- of the test terminal 2321 to determine whether the pluggable transmitter module 222 is normal.

[0039] When the loop current needs to be detected, the two probes of the ammeter are simply plugged into the positive and negative terminals T+ and T- of the current detection terminal 242. Since the internal resistance of the ammeter is theoretically zero, the diode is directly short-circuited, which is equivalent to connecting the ammeter in series in the loop. The loop current flows back to the negative terminal of the power supply through the ammeter, realizing quick detection of the loop current.

[0040] The three signal paths are independent of each other. If a pluggable transmitter module 222 has a problem, it can be directly replaced with a new spare part.

[0041] It is to be understood that the present invention is described by way of embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and embodiments that can fall within the scope of the claims of this application all fall within the scope protected by the present invention.

[0042] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A multi-channel pluggable modular transmitter capable of online maintenance, comprising a transmitter housing and a mainboard fixed inside the housing, characterized in that: There are multiple independent signal processing modules on the mainboard, each of which is matched with an online maintenance module and an input / output module, corresponding to one sensor signal to be processed. The signal processing module includes a base connected to the mainboard and a pluggable transmitter module plugged into the base. The processing circuit of the sensor signal is modularly encapsulated in the pluggable transmitter module; the online maintenance module provides a working mode and a maintenance mode switching function. In the working mode, the sensor signal to be processed is transmitted to the pluggable transmitter module for processing. In the maintenance mode, the sensor signal or the pluggable transmitter module fault is identified and detected; the input and output module supplies power to the pluggable transmitter module and completes the processed signal output and signal detection.

2. The multi-channel pluggable modular transmitter capable of online maintenance according to claim 1 is characterized in that: The online maintenance module includes a double-pole double-throw switch and I / O terminals, wherein the I / O terminals include test terminals CS+ and CS-, and working terminals GZ+ and GZ-; two contacts on one side of the double-pole double-throw switch are connected to the working terminals GZ+ and GZ-, and two contacts on the other side are connected to the test terminals CS+ and CS-, and two center contacts are connected to the signal input pins of the base; the sensor signal to be processed is connected to the working terminals GZ+ and GZ-.

3. The multi-channel pluggable modular transmitter capable of online maintenance according to claim 2 is characterized in that: In the working mode, the double-pole double-throw switch is connected to the contacts on the working terminal side, and the sensor signal is transmitted to the pluggable transmitter module through the center contact for signal processing; in the maintenance mode, the double-pole double-throw switch is connected to the contacts on the test terminal side, and the sensor signal is disconnected from the pluggable transmitter module. The sensor signal is detected through the working terminals GZ+ and GZ- to determine whether the sensor is normal, or the standard sensor signal is applied to the test terminals CS+ and CS- to determine whether the pluggable transmitter module is normal.

4. The multi-channel pluggable modular transmitter capable of online maintenance according to claim 1 is characterized in that: The input-output module comprises a wiring terminal and a current detection terminal, wherein the wiring terminal comprises a signal output terminal and a power supply terminal, the power supply terminal comprises a positive terminal V+ and a negative terminal V-, the current detection terminal comprises a positive terminal T+ and a negative terminal T-, a diode is connected between the positive terminal T+ and the negative terminal T-, the anode of the diode is connected to the positive terminal T+, and the cathode is connected to the negative terminal T; the negative terminal T- is connected to the negative terminal V- of the power supply terminal, the positive terminal T+ and the positive terminal V+ of the power supply terminal are connected to the power pin of the base, and the signal output terminal is connected to the signal output pin of the base, so as to realize the power supply, processed signal output and signal detection of the pluggable transmitter module.

5. The multi-channel pluggable modular transmitter capable of online maintenance according to claim 4 is characterized in that: Insert the two probes of the ammeter into the positive and negative terminals T+ and T- of the current detection terminals, short-circuit the diode, and then quickly detect the loop current.

6. The multi-channel pluggable modular transmitter capable of online maintenance according to claim 4 is characterized in that: It also includes an explosion-proof connector and input / output cables. The explosion-proof connector is fixed on the transmitter housing, and the input / output cables are introduced into the transmitter housing through the explosion-proof connector. The processed signals of each channel are transmitted back to the wiring terminals in the corresponding input / output module through the base, and then transmitted to the central control end through the input / output cables.

7. The multi-channel pluggable modular transmitter capable of online maintenance according to any one of claims 1 to 6, characterized in that: It includes three signal processing modules, a line maintenance module and an input and output module, which respectively process one level signal, one platinum resistance temperature measurement signal and one thermocouple temperature measurement signal.

8. The multi-channel pluggable modular transmitter capable of online maintenance according to claim 1, characterized in that: In the signal processing module, the base comprises an n-hole socket (2211), an n-pin welding pin (2212), and a base body (2213), and the base is welded on the main board (2) through the n-pin welding pin (2212); the pluggable transmitter module comprises a module housing (2221), a signal processing circuit (2222), and an n-pin plug (2223); the sensor signal to be transmitted is connected to the n-pin plug (2223) to provide an external standard interface; the n-pin plug (2223) corresponds to the n-hole socket (2211) and the n-pin welding pin (2212) in a one-to-one manner to realize the electrical connection between the main board and the pluggable transmitter module; n is determined according to the signal processing requirements.

9. The multi-channel pluggable modular transmitter capable of online maintenance according to claim 8, characterized in that: An online maintenance module comprises a double-pole double-throw switch and I / O terminals; the I / O terminals comprise test terminals CS+ and CS-, and working terminals GZ+ and GZ-; the double-pole double-throw switch is welded on a mainboard, and its two left contacts are respectively connected to the working terminals GZ+ and GZ- through circuit board wiring; the two right contacts are respectively connected to the test terminals CS+ and CS-; the two center contacts are respectively connected to the corresponding pins of the n-pin base welding pins (2212), and the two signal lines of the sensor are connected to the working terminals GZ+ and GZ-.

10. The multi-channel pluggable modular transmitter capable of online maintenance according to claim 8, characterized in that: The input-output module comprises a wiring terminal and a current detection terminal; the wiring terminal is welded on a mainboard, and comprises a power supply terminal and a signal output terminal, the power supply terminal comprises a positive terminal V+ and a negative terminal V-; the current detection terminal comprises a positive terminal T+ and a negative terminal T-, a diode is connected between the positive terminal T+ and the negative terminal T-, the anode of the diode is connected to the positive terminal T+, and the cathode is connected to the negative terminal T-; the negative terminal T- is connected to the negative terminal V- of the power supply terminal, the positive terminal T+, the positive terminal V+ of the power supply terminal and the signal output terminal are connected to the corresponding pins of the n-pin base welding pin (2212), so as to realize the power supply, processed signal output and signal detection of the pluggable transmitter module.

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