阅读说明：本技术 一种混凝土拌和物出机口温度实时监测系统及方法 (Real-time monitoring system and method for temperature of outlet of concrete mixture ) 是由 王继敏 陈志远 张新源 陈颖 张献良 王立超 陈军琪 谭恺炎 梅丹 胡高坤 于 2021-08-19 设计创作，主要内容包括：一种混凝土拌和物出机口温度实时监测系统及方法,该系统包括设置在受料斗处的温度感知装置,温度感知装置连接测控单元,测控单元连接前置主机。该系统还包括卸料感知装置,卸料感知装置用于感知拌和电机的相电流,卸料感知装置连接前置主机；前置主机连接服务器。该系统还包括客户端,客户端访问服务器,对系统进行基础数据设定和信息查询；服务器用以存储系统基础数据和前置主机上传的数据,并对数据进行运算处理和展示。通过一种混凝土拌和物出机口温度实时监测系统及方法,可以实时获取混凝土拌和物出机口温度,为确保出机口温度合格提供数据支撑,便于混凝土拌和系统及时采取温度控制措施。相较于现有的方法,本发明监测方法更便利、监测频次更高。(A real-time monitoring system and method for the temperature of the outlet of concrete mixture includes a temperature sensor set at the receiving hopper and connected with a measuring and controlling unit, which is connected with a preposed host. The system also comprises a discharging sensing device, wherein the discharging sensing device is used for sensing the phase current of the mixing motor and is connected with the front host; the front host is connected with the server. The system also comprises a client, wherein the client accesses the server and performs basic data setting and information query on the system; the server is used for storing the basic data of the system and the data uploaded by the front host, and performing operation processing and displaying on the data. Through the system and the method for monitoring the temperature of the outlet of the concrete mixture in real time, the temperature of the outlet of the concrete mixture can be obtained in real time, data support is provided for ensuring the qualified temperature of the outlet, and the concrete mixing system can conveniently take temperature control measures in time. Compared with the existing method, the monitoring method is more convenient and has higher monitoring frequency.)

1. A concrete mixture outlet temperature real-time monitoring system is characterized by comprising:

the temperature sensing device (1) is arranged at the receiving hopper (14), the temperature sensing device (1) is connected with the measurement and control unit (3), and the measurement and control unit (3) is connected with the preposed host (4);

the system further comprises a discharging sensing device (2), wherein the discharging sensing device (2) is used for sensing the phase current of the mixing motor, the discharging sensing device (2) is connected with the preposed host (4), and the preposed host (4) is connected with the server (5).

2. A system for monitoring the temperature of the outlet of concrete mixture in real time according to claim 1, wherein: the temperature sensing device (1) comprises a dust blocking valve (10), and the dust blocking valve (10) is connected with the front host (4).

3. A system for monitoring the temperature of the outlet of concrete mixture according to claim 2, characterized in that: the temperature sensing device (1) comprises a fixing frame (7), a temperature sensor (8), a fixing ring (9), a pipe head (11), a pipe body (12) and a pipe tail (13);

the fixing ring (9) is provided with internal threads, one end of the fixing ring (9) is provided with a flange-shaped bulge, the temperature sensor (8) is screwed into the fixing ring (9) through the threads and is arranged in the pipe body (12) together with the fixing ring (9), and the flange-shaped bulge of the fixing ring (9) is exposed out of one end of the pipe body (12) and is in close contact with the end part;

one end of the pipe body (12) is screwed into a connector with internal threads of the dust-blocking valve (10) and is connected with one end of the dust-blocking valve (10), and the pipe head (11) is connected with the other end of the dust-blocking valve (10);

the pipe tail (13) is arranged at the other end of the pipe body (12), and a power supply and a data wire of the temperature sensor (8) penetrate out of a central hole of the pipe tail (13);

the pipe head (11) and the pipe body (12) are arranged on the upper edge of the receiving hopper (14) through a fixing frame (7).

4. A system for monitoring the temperature of the outlet of concrete mix in real time according to claim 3, wherein: the fixing ring (9), the dust blocking valve (10), the pipe head (11), the pipe body (12) and the pipe tail (13) jointly form a closed space for the temperature sensor (8) to be isolated from the outside in a non-temperature-measuring time period.

5. A system for monitoring the temperature of the outlet of concrete mixture in real time according to claim 1, wherein: the discharging sensing device (2) is a mixer working current acquisition module, senses the phase current of a mixing motor through the current acquisition module, and transmits the sensing result to the preposed host (4).

6. A system for monitoring the temperature of the outlet of concrete mixture in real time according to claim 1, wherein: observe and control unit (3) and include temperature signal processing module, data transmission module and control module, observe and control unit (3) and receive the temperature signal that temperature sensing device (1) gathered, carry out data conversion after the transmission for leading host computer (4), receive the opening and closing instruction of dust valve (10) that leading host computer (4) sent, control dust valve (10) and open and close.

7. A system for monitoring the temperature of the outlet of concrete mixture in real time according to claim 1, wherein: the prepositive host (4) downloads data from the server (5), receives and stores the data from the unloading sensing device (2) and the measurement and control unit (3), calculates the data, generates a control instruction, sends a valve opening and closing and temperature acquisition instruction to the measurement and control unit (3), and uploads the acquired temperature and current data to the server (5) in time.

8. A system for monitoring the temperature of the outlet of concrete mixture in real time according to claim 1, wherein: the system also comprises a client (6), wherein the client (6) accesses the server (5) and performs basic data setting and information query on the system; the server (5) is used for storing system basic data and data uploaded by the front-end host (4), and performing operation processing and displaying on the data.

9. The real-time monitoring method for the temperature of the outlet of the concrete mixture by adopting the real-time monitoring system for the temperature of any one of claims 1 to 8 is characterized by comprising the following steps of: collecting the working current value of the mixer at intervals, recording the process line of the current value changing along with the time, calculating the median of the latest a1 current values, and recording the median I₀The median of the first a2 current values adjacent to the latest measured value was calculated and denoted as I_-1Setting the discharge critical current of the mixer as I_sWhen I is₀<I_s<I_-1If the situation is true, the mixer is considered to start unloading; at the moment, sending an opening instruction of the dust blocking valve (10), starting to record the measured value of the temperature sensor (8) after the dust blocking valve (10) is completely opened, recording for 1 time at intervals, recording for a3 times, stopping recording, and closing the dust blocking valve (10); and taking the median value of the measured a4 temperature values as the outlet temperature representative value of the disc concrete mixture, and starting the temperature measurement of the next disc concrete when the current measured value meets the discharging judgment condition again.

10. A method for real-time monitoring of the exit temperature of a concrete mixture as claimed in claim 9, wherein: mixing deviceCritical current I of mixer discharging_sThe critical current determining method comprises the following steps: observing the running state of the mixer, recording the working current value of the mixer at the unloading starting moment corresponding to the specific concrete type and single-disc mixing amount, recording not less than a5 values, and taking the value as the unloading critical current I_s。

Technical Field

The invention relates to the field of monitoring of temperature of a concrete mixture outlet, in particular to a real-time monitoring system and method for the temperature of the concrete mixture outlet.

Background

During the production run of a concrete mixing plant, it is often necessary to monitor the temperature of the concrete as it exits the mixer port for temperature control requirements. In the prior art, manual monitoring is adopted, and the monitoring is divided into a contact type and a non-contact type. The contact method comprises the following steps: taking a concrete sample, inserting a thermometer into the concrete sample, and reading the temperature; the non-contact method comprises the following steps: when the mixer discharges materials, a temperature measuring gun is used for aligning the discharged concrete, and the temperature is read. The two modes need manual operation, time and labor are wasted, dust at a machine port is large, the machine port is unfavorable for health, the detection frequency is low, and the temperature feedback is not timely.

The temperature of the outlet of the concrete mixture is obtained in time, which is a precondition for ensuring that the concrete meets the temperature control requirement, and measures can be taken in time according to the measured temperature of the concrete to prevent the temperature of the outlet from exceeding the control range. For example, in order to prevent cracks from being generated after concrete is hardened and reduce the warehousing temperature, the outlet temperature of the concrete needs to be controlled not to exceed 7 ℃ in a certain project, and the using amount of ice chips in concrete ingredients, the mixing water temperature, the aggregate precooling temperature and the like can be adjusted in time according to the measured outlet temperature.

In addition, with the development of the current sensor technology, the computer technology and the Internet of things technology, a foundation is laid for realizing the real-time monitoring of the temperature of the outlet of the concrete mixture.

Disclosure of Invention

The invention provides a system and a method for monitoring the outlet temperature of concrete mixture in real time, which can acquire the outlet temperature of the concrete mixture in real time, provide data support for ensuring the outlet temperature to be qualified and facilitate the concrete mixing system to take temperature control measures in time. Compared with the existing method, the monitoring method is more convenient and has higher monitoring frequency.

The technical scheme adopted by the invention is as follows:

a system for monitoring the temperature of a concrete mixture outlet in real time, the system comprising:

the temperature sensing device is arranged at the receiving hopper and is connected with the measurement and control unit, and the measurement and control unit is connected with the front host;

the system also comprises a discharging sensing device, wherein the discharging sensing device is used for sensing the phase current of the mixing motor and is connected with the front host; the front host is connected with the server.

The temperature sensing device comprises a dust blocking valve, and the dust blocking valve is connected with the front host.

The temperature sensing device comprises a fixing frame, a temperature sensor, a fixing ring, a pipe head, a pipe body and a pipe tail; the fixed ring is provided with internal threads, one end of the fixed ring is provided with a flange-shaped bulge, the temperature sensor is screwed into the fixed ring through the threads and is arranged in the tube body together with the fixed ring, and the flange-shaped bulge of the fixed ring is exposed out of one end of the tube body and is tightly contacted with the end part; one end of the pipe body is screwed into a connector with internal threads of the dust-blocking valve and is connected with one end of the dust-blocking valve, and the pipe head is connected with the other end of the dust-blocking valve; the tube tail is arranged at the other end of the tube body, and a power supply and a data wire of the temperature sensor penetrate out of a central hole of the tube tail; the pipe head and the pipe body are arranged on the upper edge of the receiving hopper through a fixing frame.

The discharging sensing device is a mixer working current acquisition module, senses the phase current of a mixing motor through the current acquisition module, and transmits a sensing result to the front host.

The measurement and control unit comprises a temperature signal processing module, a data transmission module and a control module, receives a temperature signal acquired by the temperature sensing device, converts the temperature signal, transmits the temperature signal to the front host, receives an opening and closing instruction of the dust valve sent by the front host, and controls the dust valve to be opened and closed.

The prepositive host downloads data from the server, receives and stores the data from the unloading sensing device and the measurement and control unit, calculates the data, generates a control instruction, sends a valve opening and closing and temperature acquisition instruction to the measurement and control unit, and uploads the acquired temperature and current data to the server at proper time.

The system also comprises a client, wherein the client accesses the server and performs basic data setting and information query on the system; the server is used for storing the basic data of the system and the data uploaded by the front host, and performing operation processing and displaying on the data.

A real-time monitor method for the temp at outlet of concrete mixture includes such steps as periodically collecting the current values of mixer, recording the time variation of current values, calculating the median of the current values of 1, and recording it as I₀The median of the first a2 current values adjacent to the latest measured value was calculated and denoted as I_-1Setting the discharge critical current of the mixer as I_sWhen I is₀<I_s<I_-1And if so, the mixer is considered to start discharging. At the moment, sending a dust valve opening instruction, starting to record the measured value of the temperature sensor when the dust valve is completely opened, recording for 1 time at intervals of a3 times, stopping recording, and closing the dust valve; the median of the a4 measured temperature values was taken as the representative outlet temperature value for the pan concrete mix. And when the current measured value meets the discharging judgment condition again, starting the temperature measurement of the next plate of concrete.

Critical current I for discharge of mixer_sNeeds to be determined in advance and corrected in time. The critical current determination method comprises the following steps: observing the running state of the mixer, recording the working current value of the mixer at the unloading starting moment corresponding to the specific concrete type and single-disc mixing amount, recording not less than a5 values, and taking the value as the unloading critical current I_s。

The invention discloses a system and a method for monitoring the temperature of a concrete mixture outlet in real time, which have the following beneficial effects: 1) The system is provided with a preposed host which is positioned near the temperature sensing device, the unloading sensing device and the measurement and control unit, the preposed host directly receives and stores current data acquired by the unloading sensing device, calculates and generates an instruction by itself, sends the instruction to the measurement and control unit, receives, stores and processes the acquired temperature data, and then communicates with a server through the preposed host instead of directly communicating the server with the unloading sensing device and the measurement and control unit. The structure can ensure that the prepositive host and the nearby field facility adopt more stable close-range communication, ensure the stability and the real-time performance of temperature monitoring, and can continue data acquisition work under the condition that the prepositive host and the server temporarily interrupt the communication. The preposed host, the server and the client can adopt long-distance wireless network communication. Therefore, the system can realize data monitoring in wider geographical span and stable acquisition of field data. 2) The temperature sensor adopts an infrared thermometer, so that the non-contact temperature measurement of a measured object can be realized, and the abrasion of the temperature sensor and the delay of temperature sensing caused by a contact measurement mode are avoided. 3) The temperature sensing device is structurally arranged, and the fixing ring, the dust blocking valve, the tube head, the tube body and the tube tail jointly form a closed space, so that the temperature sensor is isolated from the outside in a non-temperature measuring period, and the pollution of more dust and water vapor to an optical probe in the temperature sensor in a production environment of a mixing station is reduced. And in the unloading period, the dust blocking valve can be opened, light enters the sensor, and the device can normally measure the temperature. 4) The discharging sensing device judges the discharging state by monitoring the working current of the mixer, so that only one current transformer needs to be buckled on a power supply line of the mixer when the system is built, the circuit of the mixing system is prevented from being deeply involved, the interference to the mixing system is reduced, and the convenience of building the system is improved. 5) According to the method, the method of taking the median value instead of the average value is used when the unloading state is judged, the machine port temperature representative value is calculated, and the unloading critical current is determined, so that the adverse effect of the abnormal value acquired under the complex electromagnetic environment on the site on the result can be effectively avoided, and the value taking accuracy is improved.

Drawings

FIG. 1 is a schematic view of a monitoring system according to the present invention.

FIG. 2 is a graph showing the variation of the working current of the mixer.

Fig. 3 is a graph of a real-time temperature process.

FIG. 4 is a graph illustrating a representative outlet temperature profile.

Detailed Description

As shown in fig. 1, a real-time monitoring system for the temperature of a concrete mixture outlet comprises a temperature sensing device 1, a discharging sensing device 2, a measurement and control unit 3, a front host 4, a server 5 and a client 6.

The temperature sensing device 1 is arranged at the upper edge of the receiving hopper 14 and consists of a fixed frame 7, a temperature sensor 8, a fixed ring 9, a dust valve 10, a pipe head 11, a pipe body 12 and a pipe tail 13. Wherein, the temperature sensor 8 is a cylindrical infrared thermometer, the optical resolution (the ratio of the measuring distance to the target diameter) is not less than 20, and the column body is provided with an external thread; the fixing ring 9 is a section of plastic pipe provided with internal threads, and one end of the fixing ring is provided with a flange-shaped bulge; the dust valve 10 is an electric ball valve, and the tubular joints at the two ends of the valve body are provided with internal threads; the pipe head 11 is a section of metal pipe, and one end of the metal pipe is provided with an external thread; the tube body 12 is a section of metal tube, and external threads are arranged at two ends of the metal tube; the pipe tail 13 is a metal end cover provided with internal threads, and a wire outlet hole is formed in the center of the end cover. The fixing frame 7 is a section of bent steel plate, and 2 pipe clamps are welded on the fixing frame in parallel.

The temperature sensor 8 is screwed into the fixing ring 9 through threads and is arranged in the pipe body 12; the flange-shaped projection of the fixing ring 9 is exposed out of one end of the pipe body 12 and is tightly contacted with the end part, and the end of the pipe body 12 is screwed into the connector with internal threads of the dust-blocking valve 10 and is connected with one end of the dust-blocking valve 10; the pipe head 11 is connected with the other end of the dust-blocking valve 10 through threads; the pipe tail 13 is connected to the other end of the pipe body 12 through threads, and a power supply and a data line of the temperature sensor 8 penetrate out of a central hole of the pipe tail 13. The fixing frame 7 clamps the pipe body 12 and the pipe head 11 through two pipe clamps, and the bent steel plate part of the fixing frame is fixed at a proper position on the upper edge of the receiving hopper 14, and the fixing angle enables the longitudinal axis of the temperature sensor 8 to be intersected with the concrete 15 in the receiving hopper 14.

The discharging sensing device 2 is a mixer working current acquisition module, senses the phase current of a mixing motor through a current transformer, and transmits the sensing result to the front host 4.

The measurement and control unit 3 comprises a temperature signal processing module, a data transmission module and a control module, is connected with the temperature sensing device 1 and the front host 4, receives temperature signals collected by the temperature sensing device 1, performs data conversion and transmits the temperature signals to the front host 4, receives opening and closing instructions of the dust valve 10 sent by the front host 4, and controls the dust valve 10 to be opened and closed.

The prepositive host 4 downloads data from the server 5, receives and stores the data from the unloading sensing device 2 and the measurement and control unit 3, calculates the data, generates a control instruction, sends a valve opening and closing and temperature acquisition instruction to the measurement and control unit 3, and uploads the acquired temperature and current data to the server 5 at proper time; the client 6 accesses the server 5 and performs basic data setting and information query on the system; the server 5 is used for storing the system basic data and the data uploaded by the front host 4, and performing operation processing and displaying on the data.

The implementation and data processing method comprises the following steps:

1) a real-time monitoring system for the temperature of the outlet of the concrete mixture is set up, so that the temperature sensing device 1, the unloading sensing device 2, the measurement and control unit 3, the front host 4, the server 5 and the client 6 are connected and communicated smoothly;

2) when the temperature sensing device 1 is installed, the center of the concrete mixture to be measured is positioned on the longitudinal axis of the temperature sensor 8, and the ratio of the distance between the concrete mixture to be measured and the temperature sensor 8 to the projection diameter of the concrete mixture to the vertical plane of the longitudinal axis of the temperature sensor 8 is smaller than 20;

3）collecting the working current value of the mixer at regular time according to the time interval of 1-2 seconds, recording the process line of the current value changing along with the time, calculating the median of the latest 5 current values, and recording the median I₀The median of the first 5 current values adjacent to the latest measured value is calculated and recorded as I_-1Setting the discharge critical current of the mixer as I_sWhen I is₀<I_s<I_-1And if so, the mixer is considered to start discharging. At this time, an opening instruction of the dust valve 10 is sent, the measured value of the temperature sensor 8 starts to be recorded after the dust valve is completely opened, the recorded value is recorded for 1 time every 2 seconds and 20 times, the recording is stopped, and the dust valve 10 is closed. The median of the 20 measured temperature values was taken as the representative outlet temperature value for the pan concrete mix. And when the current measured value meets the discharging judgment condition again, starting the temperature measurement of the next plate of concrete.

4) Critical discharging current I of mixer_sNeeds to be determined in advance and corrected in time. The critical current determination method comprises the following steps: observing the running state of the mixer, recording the working current value of the mixer at the unloading starting moment corresponding to the specific concrete type and single-disc mixing amount, recording not less than 10 values, and taking the median value as the unloading critical current I_s。

Example (b):

a hydraulic power station has a concrete mixing station, two layers are arranged in the station, a receiving hopper is arranged below the outlet of a mixer, and concrete mixture discharged from the mixer falls into the receiving hopper 14 for short time, then continuously falls into a transport vehicle. The temperature sensing device 1 is welded and fixed on the supporting steel column of the mixer on the upper edge of the receiving hopper 14, so that the probe of the temperature sensing device is aligned to the position where the receiving hopper 14 is used for receiving more concrete. And the measurement and control unit 3 is tied and fixed on the railing in the station. A preposed host 4 and a discharging sensing device 2 are arranged on the top surface of a control cabinet in a central control room, and a current transformer of the discharging sensing device 2 is annularly buckled on a power supply line of a mixer in a power distribution cabinet.

The temperature sensor 8 is a CK-01A type infrared temperature sensor and outputs a signal of 4-20 mA.

The discharging sensing device 2 adopts a DAM3505N type current acquisition module.

A DAM4502 type analog quantity conversion 485 module is selected as a temperature signal processing module in the measurement and control unit 3, a WF5010 type WIFI-DTU is selected as a data transmission module, and a DAM0100 type serial port relay control panel is selected as a control module.

The prepositive host 4 selects an industrial personal computer. The server 5 is a cloud server.

C25 concrete, 3 square per plate, corresponding critical current I of unloading_sDetermined to be 125A. After the concrete mixture outlet temperature real-time monitoring system is built, the operation is started, the unloading sensing device 2 sends the collected working current of the mixer to the preposed host 4 in real time, the preposed host 4 receives and stores current data, the analysis and judgment are carried out, when the unloading condition is found to be met, a temperature collecting instruction is sent to the measurement and control unit 3, the measurement and control unit 3 receives the instruction, the temperature sensing device 1 is enabled to open the dust blocking valve 10, the temperature is collected after the valve opening instruction is sent for 4 seconds and is stored in the preposed host 4, 20 temperature values are collected once the dust blocking valve 10 is opened, and the value is taken as the outlet temperature representative value of the concrete in the tray and is also stored in the preposed host 4. The client 6 can remotely access the cloud server through the internet, and the server 5 retrieves data from the front host 4 and displays the data on the client 6.

A graph of the variation of the operation current of a typical mixer is shown in fig. 2. A real-time temperature course graph for the corresponding time period is shown in fig. 3. The process graph of the representative value of the outlet temperature of the corresponding time period is shown in fig. 4.

Fig. 2 is a graph of the variation process of the working current of the mixer of "2 # building 2 machine", and the time ranges are: 2021-07-2816: 40 to 2021-07-2816: 54, with time on the abscissa and current on the ordinate. The horizontal arrowed lines in fig. 2 correspond to the 125A current. It can be seen that the current course line passes the 125A current line 3 times down during this period, corresponding to 3 discharges. There are 3 temperature sequences in fig. 3, corresponding to 3 unloads in fig. 2.

The statistical result of the absolute error range of temperature measurement of the real-time monitoring system for the temperature of the outlet of the concrete mixture is +/-0.6 ℃, and the precision requirement of dynamically sensing the temperature of the outlet of the concrete mixture in the production process can be met.

The invention relates to a system and a method for monitoring the temperature of a concrete mixture outlet in real time.A light-sensitive temperature sensor is used for sensing the temperature of the concrete mixture discharged from the mixer outlet in real time; the pollution of dust and water vapor to the optical probe of the temperature sensor is reduced by fixing the temperature sensor 8 in a metal pipe with an electric ball valve; judging the discharge of the mixer by adopting a mode of sensing the working current of the mixer in real time, opening the electric ball valve on time, opening a light path and measuring the temperature; the data management is implemented by adopting the architecture of the front host 4 and the server 5. The temperature of the concrete outlet is monitored in real time in severe environment, the system is stable in operation and convenient and fast to apply, and a foundation is laid for real-time control of the temperature of the concrete outlet in concrete production.