阅读说明：本技术 一种大体积混凝土温度自动化监测装置 (Automatic monitoring devices of bulky concrete temperature ) 是由 秦世伟 戴自立 孙炎 陆俊宇 于 2020-11-11 设计创作，主要内容包括：本发明公开了一种大体积混凝土温度自动化监测装置,主要包括太阳能电源、现场采集器、温度传感器和传感器引线。太阳能电源与现场采集器相连,保证对温度传感器和现场采集器持续供电。温度传感器利用微控制单元采集多通道的混凝土温度,利用传感器引线通过串口传输到现场采集器的主控芯片中进行温度数据的读取和保存。现场采集器在接收到温度传感器传输的信号后,负责温度数据的信号匹配以及传输,将现场数据实时发送至云端服务器；现场采集器进行设备指令的接收与发送、设备睡眠与唤醒。本发明采用无线通讯、USB通讯、自动化控制手段,操作简便,设计智能,可开发程度高,能够实现对工业、民用条件下大体积混凝土温度的现场和远程监测和预警。(The invention discloses a large-volume concrete temperature automatic monitoring device which mainly comprises a solar power supply, an on-site collector, a temperature sensor and a sensor lead. The solar power supply is connected with the field collector, so that the temperature sensor and the field collector are continuously powered. The temperature sensor collects the temperature of the concrete in multiple channels by using the micro control unit, and the temperature data is read and stored by using the sensor lead wire to be transmitted to a main control chip of the on-site collector through a serial port. The field collector is responsible for signal matching and transmission of temperature data after receiving signals transmitted by the temperature sensor, and sends the field data to the cloud server in real time; and the field collector receives and sends the device instruction and sleeps and awakens the device. The invention adopts wireless communication, USB communication and automatic control means, has simple and convenient operation, intelligent design and high development degree, and can realize on-site and remote monitoring and early warning of the temperature of mass concrete under industrial and civil conditions.)

1. The utility model provides a bulky concrete temperature automatic monitoring device, includes solar power source, on-the-spot collector, temperature sensor and sensor lead wire, its characterized in that: the solar power supply is connected with the field collector and supplies power to the temperature sensor and the field collector;

the temperature sensor collects the temperature of the multi-channel concrete of at least 2 channels by using the MCU, and transmits the temperature to a main control chip of the on-site collector by using a sensor lead through a serial port to read and store temperature data; fixing a temperature sensor on a steel bar, setting different depths of temperature measuring points, fixing a sensitive element at the top end of the temperature sensor at each temperature measuring point, separating the sensitive element at the top end of the temperature sensor from the steel bar by using a temperature insulating gasket, arranging a protective layer on the sensitive element at the top end of the temperature sensor, which is in contact with concrete, and a lead of the sensor, which is reserved with a loose buffer part; fixing a steel bar for fixing the sensitive element at the top end of the temperature sensor on a steel bar framework of a concrete top plate, and embedding the sensitive element at the top end of the temperature sensor into concrete; connecting each sensor connection to a plurality of channels;

the field collector comprises a level converter, a wireless signal clamping groove and a nixie tube, and after receiving a signal transmitted by the temperature sensor, the field collector performs signal matching and transmission on temperature data and sends the field data to the cloud server in real time through a wireless network signal; the field collector is arranged in an external protection box;

the on-site collector also receives and sends an equipment instruction, sleeps and awakens the equipment, monitors and warns the temperature of the mass concrete on site and remotely, so that the temperature of the mass concrete can be measured at one measuring point by the automatic monitoring device for the temperature of the mass concrete; or the temperature of each preset measuring point in the mass concrete can be synchronously acquired without additionally constructing a device for batch measurement.

2. The automatic temperature monitoring device for mass concrete according to claim 1, characterized in that: the outer shell of the external protection box is made of aluminum alloy materials, and the inner wall of the protection box is coated with a waterproof and heat-insulating material layer.

3. The automatic temperature monitoring device for mass concrete according to claim 1, characterized in that: a solar power supply and a built-in rechargeable lithium battery are used to form a dual-power-supply-mode device, and the device can continuously supply power to the large-volume concrete temperature automatic monitoring device.

4. The automatic temperature monitoring device for mass concrete according to claim 1, characterized in that: set up the self-resuming fuse between temperature sensor's power and electric wire earthing terminal, avoid when temperature sensor is connected to every passageway, thereby the condition emergence of burning out the collector because the wiring problem leads to the short circuit.

5. The automatic temperature monitoring device for mass concrete according to claim 4, characterized in that: the self-recovery fuse has the double functions of overcurrent and overheat protection and automatic recovery; when abnormal large current occurs in the circuit, the resistance of the self-recovery fuse becomes very large, and high temperature is generated so as to prevent the current from passing; when the temperature returns to normal, the resistance of the self-recovery fuse becomes smaller, and therefore the conduction of the line is recovered.

6. The automatic temperature monitoring device for mass concrete according to claim 1, characterized in that: the temperature sensor adopts a DS18B20 digital temperature sensor probe, and an EEPROM module is arranged in the sensor to realize temperature limit alarm.

7. The automatic temperature monitoring device for mass concrete according to claim 1, characterized in that: the field collector adopts a double-isolation system to match and unpack the data stream of the temperature sensor and convert the signal into temperature data; the single-chip microcomputer A is used for collecting transmission signals of the temperature sensor and then sending the collected data to the single-chip microcomputer B, and the single-chip microcomputer B is used for sending the data to a background through the wireless signal module to be output or displaying the data on a display installed on a field collector.

8. The automatic temperature monitoring device for mass concrete according to claim 1, characterized in that: the field collector adopts STEM32 host computer chip, and the built-in procedure reads the complete sensor single bus signaling fast.

9. The automatic temperature monitoring device for mass concrete according to claim 1, characterized in that: the field acquisition unit adopts a data multi-scheme transmission mode, and can ensure the safe transmission of data under different external operation conditions; a 232 serial port is arranged in the field collector, and temperature data are directly read in the field; and a local area network wireless or 4G signal transmission device is arranged in the collector for carrying out remote data transmission.

10. The automatic temperature monitoring device for mass concrete according to claim 1, characterized in that: the on-site collector adopts low-power-consumption devices, a 12v power supply is reduced to 5v by using a level converter, the manual control mode and the automatic control mode can be selected and switched, a timer is further arranged in the on-site collector, and the whole set of system of the large-volume concrete temperature automatic monitoring device can be kept working continuously by controlling the awakening and sleeping of equipment in a timed mode.

Technical Field

The invention relates to a large-volume concrete temperature automatic monitoring device which can be applied to large-volume concrete temperature monitoring of large buildings such as bridges, dams, bearing platform foundations and the like. The device carries out dynamic monitoring through the temperature to concrete inside, and then provides the basis for the crack control of bulky concrete.

Background

Along with the increasing of the complexity of building structures, the volume of concrete engineering is also increasing, and after large-volume concrete is poured, a large amount of heat released by hydration of cement can raise the temperature inside the concrete. The concrete surface heat dissipation is faster, but bulky concrete structure is thicker, and self heat conductivity is poor, and the heat of cement hydration gathers in the structure and is difficult for scattering and disappearing, makes the inside and outside difference in temperature of concrete big, produces temperature stress in bulky inside. When the temperature stress is large enough, temperature cracks penetrating through the whole interface can be generated, great damage is brought to the structure, and the safety of the engineering structure is seriously influenced. Therefore, in the construction of mass concrete, the temperature change condition inside the mass concrete can be known in time through effective temperature measurement work, the heat preservation and moisture preservation work outside the concrete is guided according to the temperature measurement result, the temperature difference between the inside and the outside of the concrete member is reduced, and the concrete temperature measurement device has important significance for controlling the quality and the cracks of the concrete.

The traditional large-volume concrete temperature measurement mainly adopts manual work, namely, a temperature sensor is arranged on the site, and the temperature of the site is sampled by constructors at irregular intervals so as to know the temperature change of the concrete. The method has the defects that the manual sampling time interval is large, the temperature change data cannot be acquired in real time at high frequency, the labor cost is high, the efficiency is low, and the technical problem to be solved is urgently solved.

Disclosure of Invention

Aiming at solving the technical problems existing in the prior art, the invention aims to overcome the defects existing in the prior art and provide the automatic monitoring device for the temperature of the mass concrete, which can monitor the change of the internal temperature of the mass concrete in real time, ensure that the whole device is not influenced by external factors in the monitoring process and ensure the continuity and the accuracy of monitoring data transmission aiming at the technical problems existing in the mass concrete temperature monitoring of the existing building structure. The device can also send early warning information when the temperature exceeds a limit value, so that the working personnel can take appropriate engineering measures in time. The device has the advantages of simple structure, high reliability, low cost, wide temperature monitoring range, high precision and simple operation, has a good effect on temperature monitoring of mass concrete construction, can effectively reduce the temperature monitoring cost and the construction difficulty of mass concrete construction, and has good engineering application prospect.

In order to achieve the purpose of the invention, the invention adopts the following technical scheme:

a large-volume concrete temperature automatic monitoring device comprises a solar power supply, an on-site collector, a temperature sensor and a sensor lead, wherein the solar power supply is connected with the on-site collector and used for supplying power to the temperature sensor and the on-site collector;

the temperature sensor collects the temperature of the multi-channel concrete of at least 2 channels by using the MCU, and transmits the temperature to a main control chip of the on-site collector by using a sensor lead through a serial port to read and store temperature data; fixing a temperature sensor on a steel bar, setting different depths of temperature measuring points, fixing a sensitive element at the top end of the temperature sensor at each temperature measuring point, separating the sensitive element at the top end of the temperature sensor from the steel bar by using a temperature insulating gasket, arranging a protective layer on the sensitive element at the top end of the temperature sensor, which is in contact with concrete, and a lead of the sensor, which is reserved with a loose buffer part; fixing a steel bar for fixing the sensitive element at the top end of the temperature sensor on a steel bar framework of a concrete top plate, and embedding the sensitive element at the top end of the temperature sensor into concrete; connecting each sensor connection to a plurality of channels;

the field collector comprises a level converter, a wireless signal clamping groove and a nixie tube, and after receiving a signal transmitted by the temperature sensor, the field collector performs signal matching and transmission on temperature data and sends the field data to the cloud server in real time through a wireless network signal; the field collector is arranged in an external protection box;

the on-site collector also receives and sends an equipment instruction, sleeps and awakens the equipment, monitors and warns the temperature of the mass concrete on site and remotely, so that the temperature of the mass concrete can be measured at one measuring point by the automatic monitoring device for the temperature of the mass concrete; or the temperature of each preset measuring point in the mass concrete can be synchronously acquired without additionally constructing a device for batch measurement. Preferably, the temperature data can be transmitted by adopting 12 channels in the field collector at most, so that the temperature of each preset measuring point in the large-volume concrete can be synchronously collected, and a device is not required to be additionally built for batch measurement.

Preferably, the outer shell of the external protection box is made of an aluminum alloy material, and a waterproof and heat-insulating material layer is coated on the inner wall of the protection box. According to the invention, the cast aluminum external protection box is used outside the field collector, so that the safety of the collector is improved, the device can be ensured to normally operate in various weather environments, the design of the outer packing box is light and simple, and the carrying and installation of the whole set of equipment can be completed by one person.

Preferably, a solar power supply and a built-in rechargeable lithium battery are used to form a dual power supply mode device, and the large-volume concrete temperature automatic monitoring device is continuously powered. The invention adopts a double power supply scheme of an internal battery and solar power supply, and ensures that the whole device can maintain a normal working state under the condition of no external power supply.

Preferably, a self-recovery fuse is arranged between a power supply of the temperature sensor and a grounding end of an electric wire, so that the situation that the collector is burnt out due to short circuit caused by wiring problems when the temperature sensor is connected to each channel is avoided. According to the invention, the self-recovery fuse is added between the power supply interface of the temperature sensor and the GND, so that short circuit caused by misoperation of the joint of the temperature sensor is prevented, and the automatic recovery function of the self-recovery fuse avoids frequent operation when the fuse is replaced, so that electronic elements of the device are effectively protected.

Further preferably, the self-recovery fuse has double functions of overcurrent and overheat protection and automatic recovery; when abnormal large current occurs in the circuit, the resistance of the self-recovery fuse becomes very large, and high temperature is generated so as to prevent the current from passing; when the temperature returns to normal, the resistance of the self-recovery fuse becomes smaller, and therefore the conduction of the line is recovered.

Preferably, the temperature sensor adopts a DS18B20 digital temperature sensor probe, and an EEPROM module is arranged in the sensor to realize temperature limit alarm. The invention can realize the temperature limiting and alarming function of the device and is convenient to use.

Preferably, the field collector adopts a double-isolation system to match and unpack the data stream of the temperature sensor and convert the signal into temperature data; the temperature sensor transmission signal is collected through the singlechip A, the collected data are sent to the singlechip B, and the singlechip B sends the data to the background through the wireless signal module for output. The invention adopts the matching and unpacking of the data stream of the temperature sensor by adopting a double-isolation technology and adopts an anti-electromagnetic digital identification technology in the field collector, thereby ensuring the safety and the accuracy of data transmission.

Preferably, the field collector uses a STEM32 host chip and a built-in program quickly reads the complete sensor single bus signaling.

Preferably, the field acquisition unit adopts a data multi-scheme transmission mode, and the data can be safely transmitted under different external operation conditions; a 232 serial port is arranged in the field collector, and temperature data are directly read in the field; and a local area network wireless or 4G signal transmission device is arranged in the collector for carrying out remote data transmission.

Preferably, the on-site collector adopts a low-power-consumption device, a 12v power supply is reduced to 5v by using a level converter, the manual control mode and the automatic control mode can be selected and switched, a timer is further arranged in the on-site collector, and the whole set of system of the large-volume automatic concrete temperature monitoring device can be kept working continuously by controlling the awakening and sleeping of equipment in a timing mode. Preferably, the temperature sensor and the field collector in the invention both use a low power consumption scheme, the timer is used for automatically controlling the sleep and awakening of the equipment, the equipment is set to be in a sleep mode during normal waiting, the power supply pressure of a power supply is reduced, and the equipment is awakened when data needs to be measured, so that the equipment can automatically and uninterruptedly acquire the data in preset time.

Preferably, the temperature collector of the invention is provided with a manual key which can be awakened on site and inquired about the temperature data of 12 channels to control the temperature change in the concrete in real time, and the key can also be used for inquiring the electric quantity and the voltage to ensure the normal power supply of a power supply, and is matched with a built-in nixie tube to display the information.

Preferably, the invention is provided with a radio station, and can send data to the cloud server in real time through the radio station, so as to ensure the real reliability of the data. In addition, in order to prevent the unstable problem of radio station signal transmission in the relatively abominable operational environment in some scene, set up the 4G draw-in groove on the temperature collector, utilize the 4G signal to carry out data transmission to guarantee that data can all be uploaded in real time under various environment, do not receive transmission distance's restriction, it is nimble convenient.

Compared with the prior art, the invention has the following obvious and prominent substantive characteristics and remarkable advantages:

1. the automatic monitoring system can provide the temperature variation of the monitoring point in real time, can complete multi-project and multi-task synchronous online monitoring, does not need to worry about the storage problem of monitoring data, can realize the temperature monitoring automation and real-time function of the whole process of large-volume concrete construction, and provides service for improving the pouring quality of large-volume concrete;

2. the device adopts advanced technical means such as wireless communication, 4G communication, automatic control and the like, is simple and convenient to operate, has high system intellectualization and developability, and can realize on-site and remote monitoring and early warning of the temperature of mass concrete under industrial and civil conditions;

3. the device can monitor the change of the internal temperature of the mass concrete in real time, ensure that the whole device is not influenced by external factors in the monitoring process, and ensure the continuity and the accuracy of monitoring data transmission;

4. the device has the advantages of simple structure, high reliability, low cost, wide temperature monitoring range, high precision and simple operation, has a good effect on temperature monitoring of mass concrete construction, can effectively reduce the temperature monitoring cost and the construction difficulty of mass concrete construction, and has good engineering application prospect.

Drawings

Fig. 1 is a schematic structural diagram of an external protection box of the present invention.

Fig. 2 is a schematic structural diagram of the temperature sensor of the present invention.

Fig. 3 is a schematic structural diagram of the field collector of the present invention.

Fig. 4 is a schematic view of the installation and arrangement of the large-volume automatic concrete temperature monitoring device in the vertical direction of concrete.

Fig. 5 is a schematic diagram of the field installation operation of the device of the present invention.

FIG. 6 is a diagram showing the working state of the apparatus after the installation of the apparatus of the present invention in the field.

FIG. 7 is a graph showing the effect of temperature measurement data and temperature measurement curve of the device of the present invention.

Detailed Description

The above-described scheme is further illustrated below with reference to specific embodiments, which are detailed below:

the first embodiment is as follows:

in this embodiment, referring to fig. 1 to 6, an automatic temperature monitoring device for mass concrete includes a solar power supply, a field collector, a temperature sensor, and a sensor lead, where the solar power supply is connected to the field collector to supply power to the temperature sensor and the field collector;

the temperature sensor collects the temperature of the multi-channel concrete of at least 2 channels by using the MCU, and transmits the temperature to a main control chip of the on-site collector by using a sensor lead through a serial port to read and store temperature data; fixing a temperature sensor on a steel bar, setting different depths of temperature measuring points, fixing a sensitive element at the top end of the temperature sensor at each temperature measuring point, separating the sensitive element at the top end of the temperature sensor from the steel bar by using a temperature insulating gasket, arranging a protective layer on the sensitive element at the top end of the temperature sensor, which is in contact with concrete, and a lead of the sensor, which is reserved with a loose buffer part; fixing a steel bar for fixing the sensitive element at the top end of the temperature sensor on a steel bar framework of a concrete top plate, and embedding the sensitive element at the top end of the temperature sensor into concrete; connecting each sensor connection to a plurality of channels;

the field collector comprises a level converter, a wireless signal clamping groove and a nixie tube, and after receiving a signal transmitted by the temperature sensor, the field collector performs signal matching and transmission on temperature data and sends the field data to the cloud server in real time through a wireless network signal; the field collector is arranged in an external protection box;

the on-site collector also receives and sends an equipment instruction, sleeps and awakens the equipment, monitors and warns the temperature of the mass concrete on site and remotely, so that the temperature of the mass concrete can be measured at one measuring point by the automatic monitoring device for the temperature of the mass concrete; or the temperature of each preset measuring point in the mass concrete can be synchronously acquired without additionally constructing a device for batch measurement.

The field collector of the device is arranged in the external protection box, so that sensitive elements of the device are prevented from being damaged due to manual treading or severe weather. The automatic monitoring system of this embodiment can provide the temperature variation of control point in real time, can accomplish the synchronous on-line monitoring of multinomial multitask, and need not worry the storage problem of monitoring data, can realize the temperature monitoring automation and the real-time function of bulky concrete construction overall process, provides service for improving bulky concrete placement quality.

Example two:

this embodiment is substantially the same as the first embodiment, and is characterized in that:

in this embodiment, referring to fig. 1, fig. 4-fig. 6, the outer casing of the external protection box is made of an aluminum alloy material, and a waterproof and thermal insulation material layer is coated on the inner wall of the protection box. The embodiment uses the cast aluminum material of light weight high strength, and the integral rigidity is good, conveniently carries, and waterproof thermal insulation material polyurethane is paintd to the protection box inboard, prevents that on-the-spot collector from receiving rainwater or outside high temperature's influence and stop working.

Example three:

this embodiment is substantially the same as the above embodiment, and is characterized in that:

in this embodiment, referring to fig. 1, a solar power supply and a built-in rechargeable lithium battery are used to form a dual power supply mode device, so as to continuously supply power to the mass concrete temperature automatic monitoring device. The embodiment adopts a solar power supply and built-in lithium battery double-power supply scheme, and can ensure that temperature data is collected uninterruptedly. When the concrete begins to pour, the double-power-supply-mode device can provide electric energy for the automatic monitoring device for the temperature of the large-volume concrete, and when the electric quantity of the rechargeable lithium battery is insufficient, the solar battery can supply power, so that the power supply modes are mutually supplemented.

Example four:

this embodiment is substantially the same as the above embodiment, and is characterized in that:

in this embodiment, referring to fig. 3-4, a self-recovery fuse is disposed between the power supply of the temperature sensor and the ground of the wire, so as to avoid the occurrence of the situation that the collector is burned out due to short circuit caused by the wiring problem when the temperature sensor is connected to each channel. The self-recovery fuse has the double functions of overcurrent and overheat protection and automatic recovery; when abnormal large current occurs in the circuit, the resistance of the self-recovery fuse becomes very large, and high temperature is generated so as to prevent the current from passing; when the temperature returns to normal, the resistance of the self-recovery fuse becomes smaller, and therefore the conduction of the line is recovered. The temperature sensor adopts a DS18B20 digital temperature sensor probe, and an EEPROM module is arranged in the sensor to realize temperature limit alarm.

Example five:

this embodiment is substantially the same as the above embodiment, and is characterized in that:

in this embodiment, referring to fig. 1 to 6, the field collector adopts a dual-isolation system to match and unpack the data stream of the temperature sensor, and converts the signal into temperature data; the single-chip microcomputer A is used for collecting transmission signals of the temperature sensor and then sending the collected data to the single-chip microcomputer B, and the single-chip microcomputer B is used for sending the data to a background through the wireless signal module to be output or displaying the data on a display installed on a field collector. The embodiment can effectively improve the stability and the safety of temperature data transmission.

The field collector adopts STEM32 host chip, and the built-in program quickly reads the complete sensor single bus signaling. In the embodiment, the STEM32 host chip is used, and the built-in program can read a complete sensor single bus signaling in a very short time, so that the problem of time sequence transmission of the sensor is solved, and the stability and accuracy of data can be effectively improved.

The field acquisition unit adopts a data multi-scheme transmission mode, and can ensure the safe transmission of data under different external operation conditions; a 232 serial port is arranged in the field collector, and temperature data are directly read in the field; and a local area network wireless or 4G signal transmission device is arranged in the collector for carrying out remote data transmission. The embodiment adopts multi-scheme data transmission, can ensure that data is safely transmitted under different external operation conditions, and the 232 serial port is arranged in the field collector, so that temperature data can be directly read in the field.

The on-site collector adopts low-power-consumption devices, a 12v power supply is reduced to 5v by using a level converter, the manual control mode and the automatic control mode can be selected and switched, a timer is further arranged in the on-site collector, and the whole set of system of the large-volume concrete temperature automatic monitoring device can be kept working continuously by controlling the awakening and sleeping of equipment in a timed mode. This embodiment wholly adopts the low-power consumption scheme, can not only carry out manual control, and inside still sets up the timer, can also the timing control equipment awaken up and sleep, guarantees that the whole device can last work.

Example six:

this embodiment is substantially the same as the above embodiment, and is characterized in that:

in this embodiment, referring to fig. 1-7, the present invention is further detailed as follows with reference to the drawings and the preferred embodiments:

fig. 1 is a schematic structural diagram of an external protection box, the external protection box is 180 × 260 × 80mm in size, and a circular hole with a diameter of 20mm is formed in the upper portion of the external protection box so as to place an antenna. The protection box shell is made of light cast aluminum high-strength materials, overall rigidity is high, the protection box is light and convenient to carry, normal work of an internal field collector can be guaranteed to the maximum extent, the inner wall is coated with waterproof and heat-insulating materials, water inlet damage in a rainy or snowy day or in the construction process of equipment can be prevented, and parts with overhigh internal temperature caused by direct irradiation of outdoor sunlight can be prevented from being burnt. The external protection box is a modularized device and is provided with a box cover, the box cover is assembled with the box body through a hasp, the field collector is packaged in the external protection box, a handle is arranged on the box cover, the box cover is conveniently opened, and devices in the box body are maintained and replaced. The top of the external protection box is also provided with a portable structure, so that the external protection box is convenient to carry and transport.

FIG. 2 is a sample diagram of a DS18B20 temperature sensor, wherein the sensor collects the concrete temperature through a Micro Control Unit (MCU) and transmits the concrete temperature to a temperature collector, the temperature measuring range is-20 ℃ to 125 ℃, and the measuring precision is +/-0.3 ℃.

Fig. 3 is a schematic view of a field collector, which is a core system of the whole invention, and the design size is 150 × 220mm, the field collector is provided with 3 round holes with the diameter of 20mm as positioning holes for facilitating the positioning of equipment, and is further provided with 8 fixing holes with the diameter of 30mm for fixing the field collector. The field collector is provided with an antenna interface which is used for connecting an antenna. And a display and a 4G status indicator lamp are arranged on the board card of the on-site collector to output and remind information. The board card of the on-site collector is provided with a 4G card slot and an STEM main control chip, and is also provided with a multi-channel component; in addition, a 232 data interface is further arranged on the board card of the on-site collector, a solar charging port and a power supply interface are further arranged for connecting a power supply device, and a switch button is further arranged on the board card of the on-site collector for carrying out electrification and electrification control on the on-site collector.

The on-site collector STEM32 mainboard adopts two isolation techniques, and the main function is to match temperature sensor's signal, turns into temperature data with the signal, and the mainboard still is provided with memory function, can locally save 2000 temperature data at most. The field collector is powered by a lithium battery, two charging ports are arranged at the lower part of the collector, one charging port is an alternating current charging port, the other charging port is a solar charging port, a double-power-supply mode is adopted, and after an external power supply is used for charging the collector before measurement, the power supply requirement of equipment can be directly met by solar energy on the field. The collector adopts a low power consumption mode, external 12V voltage is reduced to low voltage through the level converter for the collector to use, the sleep and awakening of the internal timer automatic control equipment are also utilized, the working mode of the equipment can be controlled on site through a switch button in the collector, and the internal concrete temperature is grasped in real time through the combination of manual control and automatic control.

The field collector is provided with 12 channels, so that the device can meet the measurement work of mass concrete at one measuring point without additional erection. In order to facilitate equipment debugging, the collector is additionally provided with a 232 data interface, and can be directly connected with a working mode and a working instruction of the PC end debugging and setting equipment, or directly read the data stored in the collector through the port under the condition of severe field conditions. The GPRS antenna can be accessed directly through the antenna interface, and the equipment can be remotely controlled through a local wireless network. The antenna can also undertake the transmission work of temperature data, and at some construction sites that do not conveniently erect radio station, still be equipped with the 4G draw-in groove in the collector, can be through 4G signal control equipment or transmission temperature data, dispose 4G state signal lamp in the collector and judge the power supply state of the power of 4G signal and 4G draw-in groove. In order to facilitate the display of the field data, a nixie tube display is arranged in the field collector and is mainly responsible for displaying the temperature data of 12 channels and displaying the electric quantity detection state.

Referring to fig. 4, the following operation steps are adopted by using the automatic monitoring device for the bulk concrete temperature according to the embodiment:

(1) before the concrete temperature measurement work, connecting each temperature sensor with a field collector, and then connecting the temperature sensors to a PC (personal computer) end by using 232 serial ports; the address and the sleep interval of each sensor are preset on the upper computer, the configuration work of the measurement point is carried out on the webpage end or the PC end, and the power supply of the field collector is charged in advance to ensure sufficient electric quantity.

(2) Fig. 4 is a schematic view of the installation and arrangement of the automatic mass concrete temperature monitoring device in the vertical direction of concrete. In actual operation, firstly fixing a temperature sensor on a steel bar with the diameter of 10mm, brushing a red paint at the position 300mm away from the top end of the steel bar as an elevation control line, measuring different temperature measuring point depths downwards from the red paint line, and then fixing a sensitive element at the top end of the temperature sensor at each temperature measuring point by using a thin iron wire; in order to prevent the heat transfer of the steel bars, the sensitive elements and the steel bars are separated by a heat insulation gasket; protective measures are simultaneously taken for the sensor and the lead to prevent the sensor and the lead from being damaged in the concrete pouring process, and the plug of the temperature measuring line is tightly wrapped by plastic to prevent the sensor and the lead from being polluted in the concrete pouring process; the sensor wire is reserved with a buffer part to prevent the wire or the temperature sensor from being damaged due to temperature stress; fixing the steel bar supporting the temperature sensor on the concrete roof steel bar framework, wherein the red paint line is flush with the finished surface of the steel bar framework; after the temperature sensors are installed, connecting the sensor joints to the 12 channels, and then connecting the solar panel with the temperature collector, so that the installation of the whole set of equipment can be completed; FIG. 5 is a schematic diagram of the field installation work of the device of the present embodiment;

(3) after the equipment is installed, a temperature collector is started, the electric quantity condition of the field collector and the strength of a 4G signal are detected, a switch button is started, the data transmission condition of each channel is tested, and parts are prevented from being damaged in the transportation and installation processes; in addition, the temperature test conditions are verified at the webpage end and the APP end, so that the stability of data transmission is ensured;

(4) before concrete pouring, whether the position and the elevation of the temperature measuring point are correct or not is checked again, and the temperature measurement deviation caused by installation errors is prevented; FIG. 6 is a diagram showing the operation of the apparatus of the present embodiment after the installation in the field;

(5) after the work is completed, the temperature change condition can be checked at the webpage end and the APP end, the warning value is detected by setting the temperature change at the webpage end, and short messages can be sent to inform field workers when the temperature is abnormal, so that the field workers can take cooling measures to the concrete in time. FIG. 7 is a graph showing the effect of temperature measurement data and temperature measurement curves of the web page side and the APP side.

The automatic monitoring device for the temperature of the mass concrete comprises a solar power supply, an on-site collector, a temperature sensor and a sensor lead. The solar power supply is connected with the field collector, so that continuous power supply to the temperature sensor and the field collector can be ensured. The temperature sensor utilizes a Micro Control Unit (MCU) to collect the concrete temperature of 12 channels, and utilizes a sensor lead to transmit the concrete temperature to a main control chip of STEM32 of a field collector through a serial port for reading and storing temperature data. The field collector comprises a level converter, a 4G card slot, a nixie tube and the like, is mainly responsible for the work of signal matching, transmission and the like of temperature data after receiving signals transmitted by the temperature sensor, and transmits the field data to the cloud server in real time through 4G signals or a wireless network; in addition, the field collector can also receive and send device instructions, sleep and wake up the device and the like, and is a core component of the whole set of system. The device adopts advanced technical means such as wireless communication, USB communication technology, automated control, and is easy and simple to handle, and design intelligence, the degree of can developing is high, can realize on-the-spot and long-range monitoring and the early warning of bulky concrete temperature under industry, civilian condition.

The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the embodiments, and various changes and modifications can be made according to the purpose of the invention, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention shall be equivalent substitutions, as long as the purpose of the present invention is met, and the present invention shall fall within the protection scope of the present invention without departing from the technical principle and inventive concept of the present invention.