Temperature measuring system for aluminum electrolysis cell

Abstract

The utility model discloses a temperature measuring system for an aluminum electrolysis cell, which comprises a host and a plurality of slaves which are connected in series through a single bus. Each slave machine is connected with a plurality of temperature sensors; the temperature sensor is used for detecting temperature values of a plurality of temperature measuring points of the aluminum electrolysis cell; an MCU module, an AD conversion module and a single-bus driving module are arranged in the host; the AD conversion module and the single bus driving module are connected with the MCU module. The temperature measurement system for the aluminum electrolysis cell is easy to implement and accurate in temperature measurement.

Description

Technical Field

[0001] The utility model relates to a temperature measuring system for an aluminum electrolytic cell. Background Art

[0002] The existing electrolytic cell temperature measurement system is characterized by a large number of temperature measurement points, high on-site temperature, harsh on-site environment, a large number of electrolytic cells, and inconsistent distances between different temperature measurement points and the host. The collected voltage signal is affected by the internal resistance of the line, resulting in large errors in the data.

[0003] The Chinese patent with publication number CN 106917109 A discloses a temperature measuring device and a distributed temperature measuring system for cathode steel bars of electrolytic cells; the distributed temperature measuring system for cathode steel bars of electrolytic cells comprises a plurality of the above-mentioned temperature measuring devices corresponding to each cathode steel bar of the electrolytic cell, a control module and an alarm module connected to the control module, the plurality of temperature measuring devices are connected via temperature measuring optical fibers, and the control module is connected to the temperature measuring device via a normal temperature temperature measuring optical cable. This temperature measuring system requires a dedicated fixing mechanism (such as a bearing seat, etc.), which is inconvenient to use.

[0004] Therefore, it is necessary to design a new temperature measurement system for aluminum electrolytic cells. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a temperature measuring system for an aluminum electrolytic cell. The temperature measuring system for an aluminum electrolytic cell has low implementation cost and high measurement accuracy.

[0006] The technical solution of the utility model is as follows:

[0007] A temperature measurement system for an aluminum electrolytic cell, comprising a host and a plurality of slaves, wherein the host and the plurality of slaves are serially connected via a single bus;

[0008] Each slave is connected with multiple temperature sensors; the temperature sensors are used to detect the temperature values ​​of multiple temperature measurement points of the aluminum electrolytic cell;

[0009] The host is provided with an MCU module, an AD conversion module and a single bus driver module; the AD conversion module and the single bus driver module are both connected to the MCU module.

[0010] Each slave is also equipped with a temperature sensor for calibration.

[0011] The number of slaves is 2 to 100. Preferably, the number of slaves is 25.

[0012] The temperature sensor used for calibration is the on-board calibration sensor.

[0013] The host outputs single bus data through the MCU, which is then output to the single bus drive harness between the host and the slave through the single bus drive module. Each slave then transmits the data to the main unit through the bus.

[0014] The temperature sensor and the self-calibration temperature sensor are thermal resistors.

[0015] The slave uses a DC voltage regulator chip.

[0016] Beneficial effects:

[0017] The temperature measurement system for aluminum electrolytic cells of the utility model adopts a single bus mode, which can greatly save the length of the wiring harness, save costs, and simplify wiring; further, the use of an on-board self-calibration sensor can significantly improve the accuracy of temperature measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a general schematic diagram of the temperature measurement system for aluminum electrolysis cells;

[0019] Figure 2 This is the electrical block diagram of the host;

[0020] Figure 3 Circuit schematic diagram. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0022] Example 1: Figure 1-3 , a temperature measurement system for an aluminum electrolytic cell, comprising a host and 25 slaves, the host and the 25 slaves being serially connected via a single bus;

[0023] Each slave is connected with 8 temperature sensors; the temperature sensors are used to detect the temperature values ​​of 8 temperature measuring points of the aluminum electrolysis cell;

[0024] The host is provided with an MCU module, an AD conversion module and a single bus driver module; the AD conversion module and the single bus driver module are both connected to the MCU module.

[0025] In addition, each slave is also equipped with a temperature sensor for calibration, namely an onboard calibration sensor.

[0026] The host outputs single bus data through the MCU, which is then output to the single bus drive harness between the host and the slave through the single bus drive module. Each slave then transmits the data back to the switchboard through the bus.

[0027] The host and the slave use a single-line communication method, and the signal is sent in the form of return-to-zero code. After the slave U3 is powered on and reset, it receives the data sent by the host U4. After receiving 9 BYTE data from 9 ports, the output port of the slave U3 starts to forward the data and provide input data for the next slave. Before forwarding, the output port of U3 is always pulled low. At this time, the slave will not receive new data. The 9 groups of output ports of U3 output corresponding data according to the received data. The signal cycle is 1.3ms. If the input signal of the slave input port is a RESET signal, the slave U3 will output the received data at the 9 output ports of the single bus input and output module. U3 will receive new data again after the signal ends. After receiving the first 9 groups of 9 BYTE data, the DOUT pin of U3 forwards the data. U3 uses automatic shaping forwarding technology, which can completely avoid signal attenuation and distortion when transmitting more points over long distances, so that the number of cascaded slaves is not limited by signal transmission.

[0028] The temperature sensor and the self-calibration temperature sensor are thermal resistors.

[0029] The slave uses a DC voltage regulator chip.

[0030] The process of self-calibration temperature sensor calibration is as follows: Figure 3 For example, this figure shows that the host measures the temperature value of the first channel. The host U4 opens the data of the 1-channel port through the DATA_OUT output of the single bus module U5, and receives the data from the DIN pin of the slave U3. After the host sends the RESET data,

[0031] DH1 and DH9 of U3 output low level, so that the indicator LED1 and LED9 light up (that is, the 1st and 9th channels are connected), and at the same time, the 3rd and 4th pins of the switch chips of U1 and U2 are connected. The voltage value of the temperature sensor of the test port and the voltage signal of the onboard sensor of the slave are transmitted to the AIN1+ and AIN1- poles of the 7th and 8th pins of the AD conversion module U6 of the host through two return buses. Because these two temperature voltage signals are on the same slave, the length of the wiring harness of the two signals is the same, so the temperature voltage signals of the two sensors contain the resistance voltage drop of the wiring harness between the slave and the host. Therefore, the voltage data of the positive and negative poles collected by the AD conversion module U6 of the host is equal to the voltage of the temperature sensor of the measurement loop minus the voltage of the onboard standard sensor of the slave. Therefore, the voltage value measured by U6 automatically eliminates the line error between the slave and the host. The models of each chip are: U1 and U2 are BL1551B, U3 is TM1809, U4 is ESP32; U5 is 74HC245; U6 is AD7705.

[0032] Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model should be included in the protection scope of this utility model.

Claims

1. A temperature measurement system for an aluminum electrolytic cell, characterized in that: It includes a host and multiple slaves, and the host and the multiple slaves are serially connected via a single bus; Each slave is connected with multiple temperature sensors; the temperature sensors are used to detect the temperature values ​​of multiple temperature measurement points of the aluminum electrolytic cell; The host is provided with an MCU module, an AD conversion module and a single bus driver module; the AD conversion module and the single bus driver module are both connected to the MCU module.

2. The temperature measurement system for aluminum electrolysis cell according to claim 1, characterized in that: Each slave is also equipped with a temperature sensor for calibration.

3. The temperature measurement system for aluminum electrolysis cell according to claim 2, characterized in that: The number of slaves is 2-100.

4. The temperature measurement system for aluminum electrolysis cell according to claim 2, characterized in that: The temperature sensor used for calibration is the on-board calibration sensor.

5. The temperature measurement system for aluminum electrolysis cell according to claim 3, characterized in that: The temperature sensor and the self-calibration temperature sensor are thermal resistors.

6. The temperature measurement system for an aluminum electrolytic cell according to any one of claims 1 to 5, characterized in that: The slave uses a DC voltage regulator chip.

Images