Fire resistance test measurement and control device convenient to calibrate

Abstract

The utility model discloses a fire resistance test measurement and control device convenient to calibrate, which comprises a box body, a calibration metering unit, a temperature input interface unit, an analog quantity input interface unit, an analog quantity output interface unit, a communication interface unit, a contact cleaning unit and a control system, the operation switch panel is provided with a metering and measuring change-over switch and a channel change-over switch, the calibration metering unit can quickly complete metering calibration, the temperature measurement input interface unit can quickly access 48 paths of temperature input signals, the analog quantity input interface unit can quickly access 16 paths of analog signals such as pressure, deformation and flow, and the calibration metering unit can quickly complete calibration calibration. The analog quantity output unit comprises four paths of controllable 4-20mA analog output quantity used for controlling the test furnace temperature, and the expansion unit can be used for expanding input and output quantity channels. According to the utility model, periodic metering calibration tasks can be completed rapidly and efficiently, and different fire resistance test requirements can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of fire resistance test devices, in particular to a fire resistance test measurement and control device which is easy to calibrate. Background Art

[0002] At present, the fire resistance test device for building components generally has fire resistance test furnace, combustion system, combustion control system, temperature thermocouple and pressure, deformation, displacement, flow sensor and other hardware equipment at the test site. Since the temperature thermocouple and various sensors are analog voltage and current, the signals for controlling the combustion system to meet the furnace temperature change are mostly analog. The direct transmission of analog signals will attenuate and be easily interfered. Therefore, a signal measurement and control box is generally set up as a field processing unit on site, using field bus and A / D conversion to improve the problems of complex field wiring, difficult to troubleshoot and repair line faults, poor data reliability, high construction cost, etc. Since the existing fire resistance test device for building components is not easy to connect to the existing digital, Internet of Things and other equipment, it seriously affects the scalability of the device, makes it difficult to achieve redundant backup of the measurement and control system, and makes it difficult to ensure the reliability of the test. This is very unfavorable for tests such as fire resistance tests of building components that are non-repeatable, accidental, and require high investment. At the same time, in order to ensure the accuracy of test data and results, according to the metrological verification requirements, each input and output signal is calibrated with a standard signal at a fixed period. The existing solution can only input the standard signal into each signal channel for calibration, which is labor-intensive and inefficient. It takes 4-5 hours to calibrate the measurement and control signal of a test furnace, which greatly affects the progress of the test work.

[0003] In view of this, there is an urgent need for a fire resistance test tool for building components, which not only has the measurement and control functions of general building component fire resistance tests, but also has flexible scalability for special component tests, and at the same time can quickly and efficiently complete periodic measurement and calibration of fire resistance test measurement and control devices. Utility Model Content

[0004] The utility model aims to provide a fire resistance test control device which is easy to calibrate in view of the shortcomings of the prior art, so as to solve the problem of low efficiency of periodic measurement and verification of fire resistance test control devices for building components.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A fire resistance test control device convenient for calibration comprises a box body, an operation switch panel is arranged on the box body, and also comprises a calibration metering unit, a temperature input interface unit, an analog input interface unit, an analog output interface unit, a communication interface unit, a contact cleaning unit and a control system. The operation switch panel is provided with a metering and measurement switching switch, a channel switching switch and a contact cleaning button. When the metering and measurement switching switch is switched to the metering position, the channels of the temperature input interface unit and the analog input interface unit are simultaneously connected to the metering input circuit of the calibration metering unit, and each channel is simultaneously provided with a metering input plug. The standard voltage signal is input into the control system after A / D conversion, and the control system verifies the signals of each input channel; when the metering and measurement switching switch is switched to the measuring position, the temperature input interface unit and the analog input interface unit input the temperature signal and the analog signal into the control system after A / D conversion. When the control system detects that the test furnace temperature deviates from the standard temperature, the control system sends a digital instruction through the analog output interface unit, and after D / A conversion, controls the oil valve opening, gas valve opening, oil pump frequency, blower and induced draft fan frequency until the test furnace temperature meets the standard heating curve requirements.

[0007] Furthermore, the calibration metering unit includes a metering and measurement switching switch, a metering and measurement indication circuit and a metering input circuit. The switching circuit of the metering and measurement switching switch is installed on the inner side of the operation switch panel. When the metering and measurement switching switch is switched to the metering position, the output end of the switching circuit is connected to the metering indication circuit, and the channels of the temperature input interface unit and the analog input interface unit are simultaneously connected to the metering input circuit. A standard voltage signal is provided through a metering input plug. The signal is input to the control system after A / D conversion. The control system converts the digital signal of each channel into a corresponding analog signal and then calibrates it to determine whether it is within the specified error range.

[0008] Furthermore, the temperature input interface unit includes a thermocouple interface board, which can be connected to multiple temperature input signals. Multiple thermocouples are respectively plugged into the thermocouple interface board through sockets. When the metering and measurement switching switch is switched to the metering position, all channels of the temperature input interface unit are simultaneously connected to the metering input circuit, and a standard voltage signal is provided through the metering input plug; when the metering and measurement switching switch is switched to the measurement position, the thermocouple is connected to the thermocouple interface board circuit through the socket, and the input temperature signal is output to the A / D conversion module through the switch relay, and then transmitted to the control system for processing through the wired channel or wireless channel of the communication interface unit.

[0009] Furthermore, the temperature input interface unit can receive 48 temperature input signals, including 6 thermocouple interface boards, and the 6 thermocouple interface boards are plugged and installed in the thermocouple interface board module.

[0010] Furthermore, the analog input interface unit includes an analog input interface board, which can connect multiple analog signals including pressure, deformation, displacement, and flow. When the metering and measurement switching switch is switched to the metering position, all input channels of the analog input interface unit are simultaneously connected to the metering input circuit, and a standard voltage signal is provided through the metering input plug; when the metering and measurement switching switch is switched to the measuring position, the analog signal is connected to the analog interface board circuit through a connector, and the input analog signal is output to the A / D conversion module via a switch relay, and then transmitted to the background control system for processing via the wired channel or wireless channel of the communication interface unit.

[0011] Furthermore, the analog input interface unit includes an analog input interface board, which can access 16 analog signals including pressure, deformation, displacement, and flow. The analog input interface board is installed in the analog interface board module, and the analog signal is 0-5V voltage and / or 4-20mA current.

[0012] Furthermore, the analog output interface unit includes an analog output interface board, which can provide multiple analog outputs for controlling the test furnace temperature. When the test furnace temperature deviates from the standard temperature during the test, the control system sends a digital control command through the analog output interface unit, which is converted into an analog output by the D / A conversion module to control the oil valve opening, gas valve opening, oil pump frequency, blower and induced draft fan frequency until the test furnace temperature meets the standard heating curve requirements.

[0013] Furthermore, the analog output interface unit includes an analog output interface board, which can provide 2 DC12V and 2 DC24V outputs for sensor power supply used to measure pressure, deformation, displacement and flow at the test site, and 4 controllable 4-20mA analog outputs for controlling the oil valve opening, gas valve opening, oil pump frequency, blower and induced draft fan frequency. The analog output interface board is installed in the analog interface board module.

[0014] Furthermore, it also includes an expansion unit for expanding input and output channels.

[0015] The utility model has the following beneficial effects:

[0016] The utility model sets a calibration metering unit, a temperature input interface unit, an analog input interface unit, an analog output interface unit, a communication interface unit, a contact cleaning unit and an expansion unit, so that the fire-resistant measurement and control device can be used as a fixed or portable data acquisition control interface system of a fire-resistant test furnace; the calibration metering unit designed at the same time can enable the fire-resistant measurement and control device to quickly and efficiently complete the periodic measurement and calibration tasks, and all channels of the temperature input interface unit and the analog input interface unit can be calibrated by inserting the metering input plug once; the expansion unit can enable the fire-resistant measurement and control device to meet different test requirements. The utility model fire-resistant test measurement and control device has good safety and reliability, is easy to operate, and can be used as a mobile test equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 It is the front view of the utility model;

[0019] Figure 3 This is a circuit diagram of the operating switch panel of the utility model;

[0020] Figure 4 It is the circuit diagram for the expansion of the thermocouple signal and analog input and output signal interface.

[0021] Figure 5 This is the interface circuit diagram of the A / D conversion module.

[0022] Figure 6 This is a circuit diagram for metering and measurement switching and relay contact cleaning.

[0023] Figure 7 This is a schematic diagram of the wired and wireless channel switching circuit.

[0024] Figure 1 In order to conveniently represent the expansion unit, not all thermocouple interface boards and analog input interface boards are drawn.

[0025] Figure 4 Since the interface expansion circuits of MOD_A, MOD_B, MOD_C, MOD_D, MOD_F, and MOD_G are the same, only the expansion circuit diagram of the signal of the thermocouple MOD_A and the analog input and output signal interface are drawn.

[0026] Figure 5 Since the interface circuit diagrams of MOD_1-MOD_8 are the same, only the interface circuit diagrams of the MOD_1 and MOD_9 conversion modules are drawn.

[0027] Figure 6 Only one circuit diagram for cleaning the relay contacts is drawn.

[0028] Markings in the figure: 1. Box; 2. Calibration metering unit; 21. Metering input socket; 22. Metering and measurement switch; 3. Temperature input interface unit; 4. Analog input interface unit; 5. Analog output interface unit; 6. Communication interface unit; 7. Contact cleaning unit; 8. Expansion unit. DETAILED DESCRIPTION

[0029] In order to better understand the present invention, the present invention is further described in detail below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0030] The utility model provides a fire resistance test measurement and control device which is easy to calibrate, comprising a box body 1, a calibration metering unit 2, a temperature input interface unit 3, an analog input interface unit 4, an analog output interface unit 5, a communication interface unit 6, a contact cleaning unit 7, an expansion unit 8 and a control system. The box body 1 is provided with an operation switch panel, and the operation switch panel is provided with a metering input socket 21, a metering and measurement switching switch 22, a channel switching switch, a contact cleaning button and an indicator light. When the metering and measurement switching switch is switched to the metering position, the channels of the temperature input interface unit and the analog input interface unit are simultaneously connected to the metering input circuit of the calibration metering unit, and standard voltage signals are simultaneously provided to each channel through the metering input plug. The signal is input into the control system for calibration after A / D conversion. When the metering and measurement switching switch 22 is switched to the measuring position, the temperature input interface unit 3 and the analog input interface unit 4 input the temperature signal and the analog signal into the control system after A / D conversion. When the control system detects that the test furnace temperature deviates from the standard temperature, the control system sends a digital instruction through the analog output interface unit 5. After D / A conversion, the oil valve opening, gas valve opening, oil pump frequency, blower and induced draft fan frequency are controlled until the test furnace temperature meets the standard heating curve requirements.

[0031] The calibration metering unit 2 can switch the input quantities of the temperature input interface unit 3 and the analog input interface unit 4 to a single metering input interface through the metering and measurement switching switch 22. It is only necessary to input the standard input quantity (standard voltage) of the metering equipment into this single metering input interface, and then cooperate with the control system to quickly complete the annual metering calibration task.

[0032] The temperature input interface unit 3 can quickly access 48 temperature input signals through the thermocouple dedicated terminals. In conjunction with the control system, the temperature signal can be set to collect temperature or temperature rise signal.

[0033] The analog input interface unit 4 can quickly access 16 analog signals, including pressure, deformation, displacement, flow, etc. The input analog signal type can be 0-5V voltage or 4-20mA current. In conjunction with the control system, analog signals such as pressure, deformation, displacement, flow, etc. are collected during the test.

[0034] The analog output unit 5 includes 2 DC12V and 2 DC24V outputs, as well as 4 controllable 4-20mA analog outputs, see Figure 4 , 2-way DC12V and 2-way DC24V outputs can be used to power sensors such as pressure, deformation, displacement, flow, etc. at the test site. 4-way controllable 4-20mA analog outputs are used to control the oil valve opening, gas valve opening, oil pump frequency, blower and induced draft fan frequency, and cooperate with the control system to control the test furnace temperature to meet the standard heating curve requirements.

[0035] The communication interface unit 6 can quickly switch between wired and wireless channels. The channel switching circuit is as follows: Figure 7 As shown, the wired channel is the main channel, using standard RS485 two-wire half-duplex communication, and the wireless channel is the backup channel, using a wireless LORA module.

[0036] The contact cleaning unit 7 can clean the input and output channel contacts through mechanical friction through the relay contact cleaning switch to prevent the contact oxidation or rust after long-term use of the channel relay from affecting the accuracy of the input and output signals, thereby ensuring the accuracy of the input and output signals. Figure 6 The circuit diagram of relay contact cleaning is given.

[0037] The expansion unit 8 can be used to expand the input and output channels, which can be expanded to 48 temperature input signals, or 16 analog input signals and 8 analog output signals at most. These signals are configurable in the control system, and can meet the needs of developing new experimental types based on the existing experimental functions.

[0038] Example

[0039] like Figure 1-Figure 7As shown, the fire resistance test measurement and control device that is easy to calibrate provided in this embodiment includes a box body 1, a calibration metering unit 2, a temperature input interface unit 3, an analog input interface unit 4, an analog output interface unit 5, a communication interface unit 6, a contact cleaning unit 7, an expansion unit 8 and a control system. An operation switch panel is provided on the box body 1, and a metering input socket 21, a metering and measurement switching switch 22, a channel switching switch, a contact cleaning button and an indicator light are provided on the operation switch panel. When the metering and measurement switching switch 22 is switched to the metering position, the channels of the temperature input interface unit and the analog input interface unit are simultaneously connected to the metering input circuit of the calibration metering unit, and a standard voltage signal is simultaneously provided to each channel through the metering input plug. The signal is input into the control system for calibration after A / D conversion. When the metering and measurement switching switch 22 is switched to the measuring position, the temperature input interface unit 3 and the analog input interface unit 4 input the temperature signal and the analog signal into the control system after A / D conversion. When the control system detects that the test furnace temperature deviates from the standard temperature, the control system sends a digital instruction through the analog output interface unit 5. After D / A conversion, the oil valve opening, gas valve opening, oil pump frequency, blower and induced draft fan frequency are controlled until the test furnace temperature meets the standard heating curve requirements.

[0040] The calibration metering unit 2 includes a metering and measuring switch 22, a metering and measuring indication circuit and a metering input circuit. When the metering and measuring switch 22 is switched to the metering position, the output end of the switching circuit is connected to the metering indication circuit, and the metering indicator light on the operation switch panel is on. Figure 6 The channels of the temperature input interface unit 3 and the analog input interface unit 4 are simultaneously connected to the metering input circuit, and a standard voltage signal is provided by inserting a metering input plug into the metering input socket 22. The signal is input to the control system after A / D conversion. The control system converts the digital signal of each channel into a corresponding analog signal and then verifies it to determine whether it is within the specified error range. If it exceeds the error range, it is corrected by adjusting the software calculation parameters.

[0041] The temperature input interface unit 3 can receive up to 48 temperature input signals, including 6 thermocouple interface boards, which are plugged into the thermocouple interface board module, and the thermocouples are plugged into the thermocouple interface boards through sockets. When the metering and measurement switching switch 22 is switched to the metering position, all channels of the temperature input interface unit 3 are simultaneously connected to the metering input circuit, and a standard metering signal is provided through the metering input plug; when the metering and measurement switching switch 22 is switched to the measurement position, the thermocouple is connected to the thermocouple interface board circuit through the socket, and the input temperature signal is output to the MOD_1-MOD_6 thermocouple temperature A / D conversion module through the switch relay, and then transmitted to the control system for processing through the wired channel or wireless channel of the communication interface unit 6.

[0042] The analog input interface unit 4 can access 16 analog signals including pressure, deformation, displacement, flow, etc., including 1 analog input interface board, which is installed in the analog interface board module, and the analog signal is 0-5V voltage or / and 4-20mA current. The circuit of the analog input interface board is installed on the inner side of the operation switch panel. When the metering and measurement switching switch 22 is switched to the metering position, all input channels of the analog input interface unit 4 are simultaneously connected to the metering input circuit, and a standard metering signal is provided through the metering input plug; when the metering and measurement switching switch 22 is switched to the measuring position, the analog signal is connected to the analog interface board circuit through the connector, and the input analog signal is output to the MOD_7-MOD_8 analog A / D conversion module through the switch relay, and then transmitted to the control system for processing through the wired channel or wireless channel of the communication interface unit 6.

[0043] The analog output interface unit includes an analog output interface board, which can provide 2 analog DC12V and 2 DC24V outputs for the power supply of sensors used to measure pressure, deformation, displacement and flow at the test site, and 4 controllable 4-20mA analog outputs for controlling the oil valve opening, gas valve opening, oil pump frequency, blower and induced draft fan frequency. The analog output interface board is installed on the analog interface board module. When the test furnace temperature deviates from the standard temperature during the test, the control system sends a digital control command through the analog output interface unit 5, which is converted into an analog output by the MOD_9 analog D / A conversion module, and then controls the oil valve opening, gas valve opening, oil pump frequency, blower and induced draft fan frequency until the test furnace temperature meets the standard heating curve requirements.

[0044] The utility model measures and outputs signals when inputting and outputting. Figure 3 , Figure 4 , Figure 5 As shown, when measuring, the standard voltage signal is Figure 3CN2 input, output from ME_I terminal to the channel of temperature input interface unit 3 and analog input interface unit 4, and then from Figure 4 The A1, A2, etc. ports of the interface unit can be used to calibrate all channels by inserting the measurement input plug once. Figure 4 The 1, 2, 3, 4, etc. sockets on the right side of the middle interface unit can be used to input voltage signals such as thermocouples. The signals output from the A1, A2, etc. ports of the interface unit are converted by A / D and then input to the control system through the data port of the control panel.

[0045] The utility model measurement and control device is also provided with an expansion unit 8 for expanding the input and output channels.

[0046] Based on 48-channel temperature input signals, 16-channel analog input signals and 4-channel analog output signals, a maximum of 48-channel temperature input signals, 16-channel analog input signals, 8-channel analog output signals or 8-channel switch input signals can be expanded, and these signals can be configured in the control system, so as to meet the needs of developing new test types based on the existing test functions.

[0047] The above is only a preferred implementation of the utility model, but the protection scope of the utility model is not limited thereto, and any modification and replacement based on the technical solution and utility model concept provided by the utility model should be included in the protection scope of the utility model.

Claims

1. A fire resistance test measurement and control device that is easy to calibrate, comprising a box body, on which an operation switch panel is provided, characterized in that: It also includes a calibration metering unit, a temperature input interface unit, an analog input interface unit, an analog output interface unit, a communication interface unit, a contact cleaning unit and a control system. The operation switch panel is provided with a metering and measurement switching switch, a channel switching switch and a contact cleaning button. When the metering and measurement switching switch is switched to the metering position, the channels of the temperature input interface unit and the analog input interface unit are simultaneously connected to the metering input circuit of the calibration metering unit, and a standard voltage signal is simultaneously provided to each channel through the metering input plug. The signal is input to the control system for calibration after A / D conversion; when the metering and measurement switching switch is switched to the measuring position, the temperature input interface unit and the analog input interface unit input the temperature signal and the analog signal to the control system after A / D conversion. When the control system detects that the test furnace temperature deviates from the standard temperature, the control system sends a digital instruction through the analog output interface unit. After D / A conversion, the oil valve opening, the gas valve opening, the oil pump frequency, the blower and the induced draft fan frequency are controlled until the test furnace temperature meets the standard heating curve requirements.

2. The fire resistance test measurement and control device that is easy to calibrate according to claim 1 is characterized in that: The calibration metering unit includes a metering and measurement switching switch, a metering and measurement indication circuit and a metering input circuit. When the metering and measurement switching switch is switched to the metering position, the output end of the switching circuit is connected to the metering indication circuit, and the channels of the temperature input interface unit and the analog input interface unit are simultaneously connected to the metering input circuit. A standard voltage signal is provided through a metering input plug, and the signal is input to the control system after A / D conversion. The control system converts the digital signal of each channel into a corresponding analog signal and then calibrates it to determine whether it is within the specified error range.

3. The fire resistance test measurement and control device that is easy to calibrate according to claim 1 is characterized in that: The temperature input interface unit includes a thermocouple interface board, which can be connected to multiple temperature input signals. Multiple thermocouples are respectively plugged into the thermocouple interface board through sockets. When the metering and measurement switching switch is switched to the metering position, all channels of the temperature input interface unit are simultaneously connected to the metering input circuit, and a standard voltage signal is provided through the metering input plug; when the metering and measurement switching switch is switched to the measurement position, the thermocouple is connected to the thermocouple interface board circuit through the socket, and the input temperature signal is output to the A / D conversion module through the switch relay, and then transmitted to the control system for processing through the wired channel or wireless channel of the communication interface unit.

4. The fire resistance test measurement and control device that is easy to calibrate according to claim 3 is characterized in that: The temperature input interface unit can receive 48 temperature input signals and includes 6 thermocouple interface boards, which are plugged and installed in the thermocouple interface board module.

5. The fire resistance test measurement and control device that is easy to calibrate according to claim 1 is characterized in that: The analog quantity input interface unit includes an analog quantity input interface board, which can be connected to multiple analog signals including pressure, deformation, displacement, and flow. When the metering and measurement switching switch is switched to the metering position, all input channels of the analog quantity input interface unit are simultaneously connected to the metering input circuit, and a standard voltage signal is provided through a metering input plug; when the metering and measurement switching switch is switched to the measuring position, the analog signal is connected to the analog quantity interface board circuit through a connector, and the input analog signal is output to the A / D conversion module through a switch relay, and then transmitted to the background control system for processing through the wired channel or wireless channel of the communication interface unit.

6. The fire resistance test measurement and control device that is easy to calibrate according to claim 5 is characterized in that: The analog input interface unit includes an analog input interface board, which can access 16 analog signals including pressure, deformation, displacement, and flow. The analog input interface board is installed in the analog interface board module, and the analog signal is 0-5V voltage and / or 4-20mA current.

7. The fire resistance test measurement and control device that is easy to calibrate according to claim 1 is characterized in that: The analog output interface unit includes an analog output interface board, which can provide multiple analog outputs for controlling the test furnace temperature.

8. The fire resistance test measurement and control device convenient for calibration according to claim 7 is characterized in that: The analog output interface unit includes an analog output interface board, which can provide 2 DC12V and 2 DC24V outputs for the power supply of sensors used to measure pressure, deformation, displacement and flow at the test site, and 4 controllable 4-20mA analog outputs for controlling the oil valve opening, gas valve opening, oil pump frequency, blower and induced draft fan frequency. The analog output interface board is installed in the analog interface board module.

9. The fire resistance test measurement and control device that is easy to calibrate according to claim 1 is characterized in that: It also includes expansion units for expanding input and output channels.

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