A constant temperature control system and method for a flour mill

Abstract

The application provides a flour mill equipment constant temperature control system and method, and relates to the technical field of constant temperature control of flour mill; the system comprises a temperature heating wire device, the temperature heating wire device is installed at the air pipe inlet pipeline of the flour mill, further comprises a first temperature sensor installed in the temperature heating wire device and a second temperature sensor installed at the outlet of the flour mill, and further comprises a constant temperature controller which carries out temperature difference calculation on the first temperature signal amount and the second temperature signal amount collected at the same time, obtains a temperature difference value, judges whether the temperature difference value deviates from a standard target temperature value, and calculates a current correction amount for adjusting the temperature heating wire device if the temperature difference value deviates; the temperature heating wire device adjusts the current according to the current correction amount. The application can adjust the current of the temperature heating wire device, keep the temperature of the flour mill at the standard target temperature value, stabilize the constant temperature in the flour mill equipment and improve the qualified rate of products.

Description

Technical Field

[0001] This invention mainly relates to the field of constant temperature control technology for grinding mills, specifically to a constant temperature control system and method for grinding mill equipment. Background Technology

[0002] Currently, the moisture content of the ground product is mainly controlled by manually selecting the appropriate moisture ratio of the raw materials or by implementing drying measures during the raw material conveying process. For a given product specification, the process involves: 1. Manually selecting the moisture ratio of the raw materials; 2. Manually collecting samples to test the moisture ratio; 3. Repeating the above steps if the product moisture content is unacceptable; 4. An unsuitable moisture ratio significantly impacts the mill's output. This operational process has drawbacks: each judgment has a time delay and limitations. The system cannot immediately detect and adjust moisture changes, and manual selection is inherently inconsistent; different personnel with varying selection experience produce different results, leading to significant waste when adjusting the product's moisture ratio for specific specifications. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a constant temperature control system and method for grinding mill equipment, which addresses the shortcomings of the prior art.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a constant temperature control system for a grinding mill, including a temperature heating wire device, the temperature heating wire device being installed at the air duct inlet pipe of the grinding mill, and also including a first temperature sensor and a second temperature sensor, the first temperature sensor being installed inside the temperature heating wire device, the second temperature sensor being installed at the outlet of the grinding mill, and also including a constant temperature controller electrically connected to the temperature heating wire device, the first temperature sensor and the second temperature sensor.

[0005] The constant temperature controller is used to send acquisition commands to the first temperature sensor and the second temperature sensor at the same time.

[0006] The first temperature sensor is used to acquire the temperature of the heating wire according to the acquisition command to obtain a first temperature signal.

[0007] The second temperature sensor is used to collect the temperature at the outlet of the grinding mill according to the acquisition command, and obtain a second temperature signal.

[0008] The constant temperature controller is used to calculate the temperature difference between the first temperature signal and the second temperature signal collected at the same time to obtain the temperature difference value, and to determine whether the temperature difference value deviates from the standard target temperature value. If it deviates, the current correction amount of the temperature heating wire device is calculated based on the deviation amount.

[0009] The temperature heating wire device is used to adjust the current according to the current correction amount.

[0010] Furthermore, in the process of determining whether the temperature difference deviates from the standard target temperature value, the thermostat also includes:

[0011] If the temperature difference does not deviate from the standard target temperature value, when the preset time is reached, a re-collection command is sent to the first temperature sensor and the second temperature sensor at the same time.

[0012] The temperature difference between the first temperature signal and the second temperature signal acquired at the same time is calculated to obtain the temperature difference value. It is then determined whether the temperature difference value deviates from the standard target temperature value. If it deviates, the current correction amount of the temperature heating wire device is calculated based on the deviation amount, so as to adjust the current of the temperature heating wire device. This process is repeated.

[0013] Furthermore, in the constant temperature controller, the temperature difference between the first temperature signal and the second temperature signal collected at the same time is calculated, and it is determined whether the temperature difference deviates from the standard target temperature value, including:

[0014] The first and second temperature signals collected at the same time are converted from analog to digital to obtain the first and second temperature values.

[0015] The temperature difference is obtained by calculating the difference between the first temperature value and the second temperature value.

[0016] Furthermore, in the constant temperature controller, the current correction amount for adjusting the temperature heating wire device is calculated based on the deviation, including:

[0017] The deviation is obtained by subtracting the standard target temperature value from the temperature difference. The current correction amount corresponding to the deviation is obtained according to the correspondence between temperature value and current. If the temperature difference is less than the standard target temperature value, the current correction amount is positive; if the temperature difference is greater than the standard target temperature value, the current correction amount is negative.

[0018] Furthermore, the temperature heating wire device includes a heating wire and a silicon controlled rectifier current adjustment module, and the heating wire and the silicon controlled rectifier current adjustment module are electrically connected;

[0019] The thyristor current adjustment module is used to confirm the sign of the current correction amount. If the current correction amount is positive, the current value is added to the current correction amount to obtain the adjustment current value, and the heating wire is driven to heat through the adjustment current value.

[0020] If the current correction is negative, then the absolute value of the current correction is taken, and the current value is subtracted from the absolute value of the current correction to obtain the adjustment current value. The heating wire is then driven to heat by the adjustment current value.

[0021] Another technical solution of the present invention to solve the above-mentioned technical problems is as follows: A method for constant temperature control of a grinding mill, comprising the following steps:

[0022] The thermostat sends acquisition commands to the first and second temperature sensors at the same time.

[0023] The first temperature sensor acquires the temperature of the heating wire according to the acquisition command, and obtains a first temperature signal.

[0024] The second temperature sensor collects the temperature at the outlet of the grinding mill according to the acquisition command, and obtains a second temperature signal.

[0025] The constant temperature controller calculates the temperature difference between the first temperature signal and the second temperature signal collected at the same time to obtain the temperature difference value, and determines whether the temperature difference value deviates from the standard target temperature value. If it deviates, it calculates the current correction amount of the temperature heating wire device by the deviation amount.

[0026] The temperature heating wire device adjusts the current according to the current correction amount.

[0027] The beneficial effects of this invention are as follows: a temperature heating wire device is installed at the air duct inlet of the grinding mill, and temperature sensors are installed at the temperature heating wire device and the outlet of the grinding mill respectively. The current correction amount is obtained by calculating the difference between the two temperature sensors and the deviation of the standard target temperature value, thereby adjusting the current of the temperature heating wire device to maintain the temperature of the grinding mill at the standard target temperature value, so as to stabilize the constant temperature inside the grinding mill equipment and improve the product qualification rate. Attached Figure Description

[0028] Figure 1 A schematic diagram of component connections for the constant temperature control system of a grinding mill provided in an embodiment of the present invention;

[0029] Figure 2 A flowchart illustrating the constant temperature control of a grinding mill provided in an embodiment of the present invention. Detailed Implementation

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0031] In existing technologies, the moisture content (e.g., 1%-3%) of the ground product in grinding mills is mainly achieved through manual screening of the raw materials to obtain the appropriate moisture ratio or by implementing drying measures during the raw material conveying process. Manual screening is inherently inconsistent; different personnel with varying screening experience produce different results, leading to significant waste when adjusting the equipment to achieve specific moisture ratios. To address these technical problems, this invention adds a temperature heating wire device, a first temperature sensor, and a second temperature sensor to the grinding mill equipment. A constant temperature controller automatically adjusts the temperature heating wire device to stabilize the temperature within the grinding mill, thereby improving the product yield. Several embodiments are described in detail below.

[0032] Example 1:

[0033] like Figure 1 As shown, the constant temperature control system for a grinding mill provided in this embodiment of the invention includes a temperature heating wire device installed at the air duct inlet of the grinding mill, a first temperature sensor and a second temperature sensor installed inside the temperature heating wire device and at the outlet of the grinding mill, and a constant temperature controller electrically connected to the temperature heating wire device, the first temperature sensor and the second temperature sensor.

[0034] The constant temperature controller is used to send acquisition commands to the first temperature sensor and the second temperature sensor at the same time.

[0035] The first temperature sensor is used to acquire the temperature of the heating wire according to the acquisition command to obtain a first temperature signal.

[0036] The second temperature sensor is used to collect the temperature at the outlet of the grinding mill according to the acquisition command, and obtain a second temperature signal.

[0037] The constant temperature controller is used to calculate the temperature difference between the first temperature signal and the second temperature signal collected at the same time to obtain the temperature difference value, and to determine whether the temperature difference value deviates from the standard target temperature value. If it deviates, the current correction amount of the temperature heating wire device is calculated based on the deviation amount.

[0038] The temperature heating wire device is used to adjust the current according to the current correction amount.

[0039] Specifically, the first temperature sensor and the second temperature sensor can be connected to the thermostat via wired or wireless electrical connections. Wired connections can be data cable connections, while wireless connections can be WiFi, 4G, or 5G connections.

[0040] Both the first and second temperature sensors can be temperature sensors of the same type that transmit 4-20mA analog temperature signals or PT100 resistance temperature detectors.

[0041] Specifically, the temperature heating wire device is installed in the straight section of the main unit's air duct inlet pipe. The first temperature sensor is installed inside the temperature heating wire device; the second temperature sensor is installed at the outlet of the mill, specifically on the upper casing of the mill (at the classifier outlet).

[0042] It should be understood that the standard target temperature value is pre-input into the thermostat.

[0043] In the above embodiments, a temperature heating wire device is installed at the air duct inlet pipe of the grinding mill, and temperature sensors are installed at the temperature heating wire device and the outlet of the grinding mill respectively. The current correction amount is obtained by calculating the difference between the two temperature sensors and the deviation of the standard target temperature value, thereby adjusting the current of the temperature heating wire device to maintain the temperature of the grinding mill at the standard target temperature value, so as to stabilize the constant temperature inside the grinding mill equipment and improve the product qualification rate.

[0044] Preferably, in the thermostat, the process of determining whether the temperature difference deviates from the standard target temperature value further includes:

[0045] If the temperature difference does not deviate from the standard target temperature value, when the preset time is reached, a re-collection command is sent to the first temperature sensor and the second temperature sensor at the same time.

[0046] The temperature difference between the first temperature signal and the second temperature signal acquired at the same time is calculated to obtain the temperature difference value. It is then determined whether the temperature difference value deviates from the standard target temperature value. If it deviates, the current correction amount of the temperature heating wire device is calculated based on the deviation amount, and the current of the temperature heating wire device is adjusted accordingly. This process is repeated.

[0047] In the above embodiments, the existing temperature can be maintained without the temperature difference deviating from the standard target temperature value, and the next cycle can be entered when the preset time is reached to collect temperature, judge temperature and adjust current. This can maintain the constant temperature state of the grinding mill and improve the product qualification rate.

[0048] Preferably, in the constant temperature controller, calculating the temperature difference between the first temperature signal and the second temperature signal collected at the same time, and determining whether the temperature difference deviates from the standard target temperature value, includes:

[0049] The first and second temperature signals collected at the same time are converted from analog to digital to obtain the first and second temperature values.

[0050] The temperature difference is obtained by calculating the difference between the first temperature value and the second temperature value.

[0051] In the above embodiments, the method can replace manual detection and judgment of temperature differences, avoiding the delay caused by the asynchronous detection of two key positions in the grinding mill, which leads to inaccurate temperature difference judgment and deviations in temperature adjustment. This invention solves the above problems by simultaneously acquiring and obtaining the first and second temperature signal quantities through the first and second temperature sensors, and quickly calculating the difference, thereby improving the accuracy of temperature difference acquisition.

[0052] Preferably, in the constant temperature controller, the current correction amount for adjusting the temperature heating wire device is calculated based on the deviation amount, including:

[0053] The deviation is obtained by subtracting the standard target temperature value from the temperature difference. The current correction amount corresponding to the deviation is obtained according to the correspondence between temperature value and current. If the temperature difference is less than the standard target temperature value, the current correction amount is positive; if the temperature difference is greater than the standard target temperature value, the current correction amount is negative.

[0054] It should be understood that the relationship between temperature and current is determined by the specifications and model of the temperature heating wire device. For example, increasing the temperature by x°C (i.e., the deviation) corresponds to increasing the current by y (i.e., the current correction).

[0055] In the above embodiments, the calculated temperature deviation is converted into a current correction amount by setting a correspondence between the temperature value and the current, thereby achieving accurate adjustment of the grinding mill temperature and avoiding the differences caused by manual processing.

[0056] Preferably, the temperature heating wire device includes a heating wire and a silicon controlled rectifier current adjustment module, and the heating wire and the silicon controlled rectifier current adjustment module are electrically connected;

[0057] The thyristor current adjustment module is used to confirm the sign of the current correction amount. If the current correction amount is positive, the current value is added to the current correction amount to obtain the adjustment current value, and the heating wire is driven to heat through the adjustment current value.

[0058] If the current correction is negative, then the absolute value of the current correction is taken, and the current value is subtracted from the absolute value of the current correction to obtain the adjustment current value. The heating wire is then driven to heat by the adjustment current value.

[0059] Specifically, the thyristor current regulation module is a power semiconductor module.

[0060] In the above embodiments, a positive current correction indicates that the current temperature of the grinding mill is too high, and the current to the heating wire needs to be reduced to lower the temperature. A negative current correction indicates that the current temperature of the grinding mill is too low, and the current to the heating wire needs to be increased to raise the temperature. This achieves the purpose of automatic temperature adjustment to ensure the production of qualified products.

[0061] Example 2:

[0062] like Figure 2 As shown, this embodiment of the invention provides a method for constant temperature control of a grinding mill, comprising the following steps:

[0063] The thermostat sends acquisition commands to the first and second temperature sensors at the same time.

[0064] The first temperature sensor acquires the temperature of the heating wire according to the acquisition command to obtain a first temperature signal; the second temperature sensor acquires the temperature at the outlet of the grinding mill according to the acquisition command to obtain a second temperature signal.

[0065] The constant temperature controller calculates the temperature difference between the first temperature signal and the second temperature signal collected at the same time to obtain the temperature difference value, and determines whether the temperature difference value deviates from the standard target temperature value. If it deviates, it calculates the current correction amount of the temperature heating wire device by the deviation amount.

[0066] The temperature heating wire device adjusts the current according to the current correction amount.

[0067] Preferably, the step of determining whether the temperature difference deviates from the standard target temperature value further includes:

[0068] If the temperature difference does not deviate from the standard target temperature value, when the preset time is reached, a re-collection command is sent to the first temperature sensor and the second temperature sensor at the same time.

[0069] The temperature difference between the first temperature signal and the second temperature signal acquired at the same time is calculated to obtain the temperature difference value. It is then determined whether the temperature difference value deviates from the standard target temperature value. If it deviates, the current correction amount of the temperature heating wire device is calculated based on the deviation amount, and the current of the temperature heating wire device is adjusted accordingly. This process is repeated.

[0070] Preferably, the step of calculating the temperature difference between the first temperature signal and the second temperature signal collected at the same time, and determining whether the temperature difference deviates from the standard target temperature value, includes:

[0071] The first and second temperature signals collected at the same time are converted from analog to digital to obtain the first and second temperature values.

[0072] The temperature difference is obtained by calculating the difference between the first temperature value and the second temperature value.

[0073] Preferably, the step of calculating the current correction amount for adjusting the temperature heating wire device based on the deviation includes:

[0074] The deviation is obtained by subtracting the standard target temperature value from the temperature difference. The current correction amount corresponding to the deviation is obtained according to the correspondence between temperature value and current. If the temperature difference is less than the standard target temperature value, the current correction amount is positive; if the temperature difference is greater than the standard target temperature value, the current correction amount is negative.

[0075] Preferably, the temperature heating wire device includes a heating wire and a silicon controlled rectifier (SCR) current adjustment module, wherein the heating wire and the SCR current adjustment module are electrically connected; the current adjustment based on the current correction amount includes:

[0076] The thyristor current adjustment module confirms the sign of the current correction amount. If the current correction amount is positive, the current value is added to the current correction amount to obtain the adjustment current value, and the heating wire is driven to heat through the adjustment current value.

[0077] If the current correction is negative, then the absolute value of the current correction is taken, and the current value is subtracted from the absolute value of the current correction to obtain the adjustment current value. The heating wire is then driven to heat by the adjustment current value.

[0078] The advantages of this invention are: a temperature heating wire device is installed at the air duct inlet of the grinding mill, and temperature sensors are installed at the temperature heating wire device and the outlet of the grinding mill respectively. The current correction amount is obtained by calculating the difference between the two temperature sensors and the deviation of the standard target temperature value, thereby adjusting the current of the temperature heating wire device to maintain the temperature of the grinding mill at the standard target temperature value, so as to stabilize the constant temperature inside the grinding mill equipment and improve the product qualification rate.

[0079] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0080] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the above-described apparatus and unit can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0081] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0082] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention, depending on actual needs.

[0083] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A constant temperature control system for a grinding mill, characterized in that, The device includes a temperature heating wire device installed at the air duct inlet of the grinding mill, a first temperature sensor and a second temperature sensor installed inside the temperature heating wire device and at the outlet of the grinding mill, and a thermostat electrically connected to the temperature heating wire device, the first temperature sensor and the second temperature sensor. The constant temperature controller is used to send acquisition commands to the first temperature sensor and the second temperature sensor at the same time. The first temperature sensor is used to acquire the temperature of the heating wire according to the acquisition command to obtain a first temperature signal. The second temperature sensor is used to collect the temperature at the outlet of the grinding mill according to the acquisition command, and obtain a second temperature signal. The constant temperature controller is used to calculate the temperature difference between the first temperature signal and the second temperature signal collected at the same time to obtain the temperature difference value, and to determine whether the temperature difference value deviates from the standard target temperature value. If it deviates, the current correction amount of the temperature heating wire device is calculated based on the deviation amount. The temperature heating wire device is used to adjust the current according to the current correction amount; The constant temperature controller further includes, in determining whether the temperature difference deviates from the standard target temperature value: If the temperature difference does not deviate from the standard target temperature value, when the preset time is reached, a re-collection command is sent to the first temperature sensor and the second temperature sensor at the same time. The temperature difference between the first temperature signal and the second temperature signal collected at the same time is calculated to obtain the temperature difference value. It is then determined whether the temperature difference value deviates from the standard target temperature value. If it deviates, the current correction amount of the temperature heating wire device is calculated based on the deviation amount, so as to adjust the current of the temperature heating wire device. This process is repeated. In the constant temperature controller, the temperature difference between the first temperature signal and the second temperature signal collected at the same time is calculated, and it is determined whether the temperature difference deviates from the standard target temperature value, including: The first and second temperature signals collected at the same time are converted from analog to digital to obtain the first and second temperature values. The temperature difference is obtained by calculating the difference between the first temperature value and the second temperature value. In the constant temperature controller, the current correction amount for adjusting the temperature heating wire device is calculated based on the deviation amount, including: The deviation is obtained by subtracting the standard target temperature value from the temperature difference. The current correction amount corresponding to the deviation is obtained according to the correspondence between temperature value and current. If the temperature difference is less than the standard target temperature value, the current correction amount is positive; if the temperature difference is greater than the standard target temperature value, the current correction amount is negative.

2. The constant temperature control system for the grinding mill equipment according to claim 1, characterized in that, The temperature heating wire device includes a heating wire and a silicon controlled rectifier current adjustment module, and the heating wire and the silicon controlled rectifier current adjustment module are electrically connected; The thyristor current adjustment module is used to confirm the sign of the current correction amount. If the current correction amount is positive, the current value is added to the current correction amount to obtain the adjustment current value, and the heating wire is driven to heat through the adjustment current value. If the current correction is negative, then the absolute value of the current correction is taken, and the current value is subtracted from the absolute value of the current correction to obtain the adjustment current value. The heating wire is then driven to heat by the adjustment current value.

3. A method for constant temperature control of a grinding mill, characterized in that, Includes the following steps: The thermostat sends acquisition commands to the first and second temperature sensors at the same time. The first temperature sensor acquires the temperature of the heating wire according to the acquisition command to obtain a first temperature signal; the second temperature sensor acquires the temperature at the outlet of the grinding mill according to the acquisition command to obtain a second temperature signal. The constant temperature controller calculates the temperature difference between the first temperature signal and the second temperature signal collected at the same time to obtain the temperature difference value, and determines whether the temperature difference value deviates from the standard target temperature value. If it deviates, it calculates the current correction amount of the temperature heating wire device by the deviation amount. The temperature heating wire device adjusts the current according to the current correction amount; The process of determining whether the temperature difference deviates from the standard target temperature value also includes: If the temperature difference does not deviate from the standard target temperature value, when the preset time is reached, a re-collection command is sent to the first temperature sensor and the second temperature sensor at the same time. The temperature difference between the first temperature signal and the second temperature signal collected at the same time is calculated to obtain the temperature difference value. It is then determined whether the temperature difference value deviates from the standard target temperature value. If it deviates, the current correction amount of the temperature heating wire device is calculated based on the deviation amount, so as to adjust the current of the temperature heating wire device. This process is repeated. The step of calculating the temperature difference between the first temperature signal and the second temperature signal collected at the same time, and determining whether the temperature difference deviates from the standard target temperature value, includes: The first and second temperature signals collected at the same time are converted from analog to digital to obtain the first and second temperature values. The temperature difference is obtained by calculating the difference between the first temperature value and the second temperature value. The calculation of the current correction amount for adjusting the temperature heating wire device based on the deviation includes: The deviation is obtained by subtracting the standard target temperature value from the temperature difference. The current correction amount corresponding to the deviation is obtained according to the correspondence between temperature value and current. If the temperature difference is less than the standard target temperature value, the current correction amount is positive; if the temperature difference is greater than the standard target temperature value, the current correction amount is negative.

4. The constant temperature control method for grinding mill equipment according to claim 3, characterized in that, The temperature heating wire device includes a heating wire and a silicon controlled rectifier (SCR) current adjustment module, wherein the heating wire and the SCR current adjustment module are electrically connected; the current adjustment based on the current correction amount includes: The thyristor current adjustment module confirms the sign of the current correction amount. If the current correction amount is positive, the current value is added to the current correction amount to obtain the adjustment current value, and the heating wire is driven to heat through the adjustment current value. If the current correction is negative, then the absolute value of the current correction is taken, and the current value is subtracted from the absolute value of the current correction to obtain the adjustment current value. The heating wire is then driven to heat by the adjustment current value.

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