An on-line grinding monitoring system and method for a grinding mill

Abstract

The present invention provides an on-line grinding monitoring system and method for a grinding mill. The system includes: a grinding mill body, a host computer controller, a temperature sensor, a feeding proximity switch, a roll gap adjusting mechanism and a pressure sensor connected to the host computer controller. The grinding mill body includes a grinding unit and a feeding unit. The feeding unit is arranged directly above the grinding unit. The feeding proximity switch is arranged on the feeding roller of the feeding unit. The temperature sensor is arranged on the bottom bracket of the grinding unit. The pressure sensor is arranged on the grinding roller of the grinding unit. The roll gap adjusting mechanism is fixedly connected to the front bearing seat of the grinding unit, and the roll gap adjusting mechanism is used to adjust the roll gap between the grinding rollers of the grinding unit. The on-line grinding monitoring system and method for a grinding mill provided by the present invention can judge whether the grinding state of the grinding mill is stable, and can adjust the roll gap of the grinding mill manually or automatically.

Description

Technical Field

[0001] The present invention relates to the technical field of flour milling machinery, and particularly to an on-line grinding monitoring system and method for a flour mill. Background Art

[0002] A flour mill needs to judge the grinding stability. When making the judgment, it often relies on the flour milling engineer to observe the ground material, feel the particle sense by touch and feel the temperature difference of the material by hand, and judge the grinding stability of the flour mill according to experience, so as to adjust the grinding gap of the flour mill. This process completely depends on the technical experience of the flour milling engineer, and cannot give quantitative information to achieve standard production, which easily leads to the problem of unstable flour quality produced by flour milling engineers at different levels. When the existing flour mill adjusts the grinding gap, it completely relies on the feeling and experience of the flour milling engineer, cannot ensure that the grinding gaps on both sides of the flour mill are consistent, and often requires the flour milling engineer to adjust manually, and cannot achieve automatic adjustment. Therefore, it is very necessary to design an on-line grinding monitoring system and method for a flour mill. Summary of the Invention

[0003] The purpose of the present invention is to provide an on-line grinding monitoring system and method for a flour mill, which can judge whether the grinding state of the flour mill is stable, can adjust the grinding gap of the flour mill manually or automatically, can ensure that the grinding gaps on both sides of the flour mill are basically the same, and reduces the dependence on the experience of the flour milling engineer for the adjustment of the grinding gap of the flour mill.

[0004] To achieve the above purpose, the present invention provides the following solutions:

[0005] An on-line grinding monitoring system for a flour mill includes a flour mill body, a host computer controller, a temperature sensor, a feeding proximity switch, a gap adjusting mechanism and a pressure sensor. The flour mill body mainly includes a grinding unit and a feeding unit. The feeding unit is arranged directly above the grinding unit and is used to make the material enter the grinding unit evenly. The feeding proximity switch is arranged on the feeding roller of the feeding unit, and the feeding proximity switch is used to obtain the rotation frequency of the feeding roller in real time. The temperature sensor is arranged on the bottom bracket of the grinding unit, and the temperature sensor is used to obtain the temperature of the ground material in real time. The pressure sensor is arranged on the grinding roller pull rod of the grinding unit, and the pressure sensor is used to obtain the grinding pressure between the grinding rollers. The gap adjusting mechanism is fixedly connected to the front bearing seat of the grinding unit, and the gap adjusting mechanism is used to adjust the grinding gap between the grinding rollers of the grinding unit. The temperature sensor, the feeding proximity switch, the gap adjusting mechanism and the pressure sensor are all electrically connected to the host computer controller.

[0006] Optionally, two pressure sensors are provided for each grinding unit, which are respectively arranged on both sides of the grinding roller and used to obtain the grinding pressures on both sides of the grinding roller in real time.

[0007] Optionally, the feeding proximity switch is connected to the host computer controller through a frequency signal processing module, and the pressure sensor is connected to the host computer controller through an analog transmitter.

[0008] Optionally, the system further includes a display, which is electrically connected to the host computer controller and used to display the information obtained by the host computer controller.

[0009] Optionally, the system further includes a server, and the host computer controller stores the obtained information in the server.

[0010] Optionally, the system further includes an alarm device, which is electrically connected to the host computer controller.

[0011] Optionally, two sets of roll gap adjusting mechanisms are provided, which are respectively fixedly connected to the front bearing seats on both sides of the grinding unit and used to adjust the roll gaps on the left and right sides of the grinding roller. The roll gap adjusting mechanism includes a manual roll gap adjusting handwheel and an automatic adjusting servo motor. The manual roll gap adjusting handwheel is used to manually adjust the roll gap, and the automatic adjusting servo motor is electrically connected to the host computer controller and used to automatically adjust the roll gap.

[0012] The present invention also provides an on-line grinding detection method for a flour mill, which is applied to the above-mentioned on-line grinding monitoring system for a flour mill and includes the following steps:

[0013] Step 1: Conduct experimental grinding on wheat with different varieties and different moisture contents, obtain the wheat variety and wheat moisture content information, and the flour milling engineer adjusts the roll gap between the grinding rollers of the grinding unit to meet the ideal requirements according to the wheat variety and wheat moisture content information. The host computer controller obtains the corresponding grinding pressure, the temperature of the material after grinding, and the rotation frequency of the feeding roller through the pressure sensor, the temperature sensor, and the feeding proximity switch, and takes the wheat variety, the wheat moisture content information, and the corresponding grinding pressure, the temperature of the material after grinding, and the rotation frequency of the feeding roller as the grinding port standard values and records them;

[0014] Step 2: According to the standard value of the grinding mouth, the grinding mill body is adjusted to process and grind the powder. The grinding pressure, the temperature of the material after grinding and the rotation frequency of the feed roller are obtained in real time, and the obtained grinding pressure, the temperature of the material after grinding and the rotation frequency of the feed roller are recorded and stored at equal time intervals. The upper computer controller analyzes the recorded grinding pressure, the temperature of the material after grinding and the rotation frequency of the feed roller to determine whether the grinding rolling distance deviation occurs. If the grinding rolling distance deviation occurs, the alarm device alarms and the analysis results are displayed on the display screen for the milling engineer to view. According to the analysis results, the milling engineer manually adjusts the rolling distance between the grinding rollers, or sets a threshold value for the system so that the system automatically controls the servo motor to automatically adjust after determining the allowable value of the grinding rolling distance deviation, so that the grinding pressure, the temperature of the material after grinding and the rotation frequency of the feed roller meet the standard value of the grinding mouth.

[0015] Optionally, in step 1, the host computer controller obtains the corresponding grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller through the pressure sensor, the temperature sensor and the feeding proximity switch, specifically:

[0016] The feeding proximity switch identifies the rotation frequency of the feeding roller and transmits the frequency signal to the frequency signal processing module. The frequency signal processing module processes the frequency into an analog current signal and sends it to the host computer controller; the pressure sensor collects the grinding pressure, outputs weak voltage information, and transmits the weak voltage information to the analog transmission. The analog transmission processes and amplifies the voltage signal to transmit the output current signal and sends it to the host computer controller; the temperature sensor detects the temperature of the material after grinding and outputs a resistance signal, and sends it to the host computer controller; after receiving the signal, the host computer controller converts the current value and the resistance value into the corresponding feeding roller rotation frequency, grinding pressure and the temperature of the material after grinding according to the preset relationship.

[0017] Optionally, in step 2, the upper computer controller analyzes the recorded grinding pressure, the temperature of the material after grinding, and the rotation frequency of the feed roller to determine whether the grinding rolling distance deviation occurs. If the grinding rolling distance deviation occurs, the alarm device alarms and displays the analysis results on the display screen for the milling engineer to view. The milling engineer manually adjusts the rolling distance between the grinding rollers based on the analysis results, or sets a threshold for the system so that the system automatically controls the servo motor to automatically adjust after determining the allowable value of the grinding rolling distance deviation, so that the grinding pressure, the temperature of the material after grinding, and the rotation frequency of the feed roller meet the grinding standard value, specifically:

[0018] The host computer controller collects the grinding pressure in real time, and compares it with the grinding pressure in the grinding port standard value. If the difference between the grinding pressure and the grinding pressure in the grinding port standard value is greater than the preset allowable offset value, the host computer controller alarms through the alarm device and displays the information on the display screen. The flour milling engineer adjusts the roll gap manually by turning the manual roll gap adjustment handwheel or automatically controls the servo motor through the host computer controller to adjust the roll gap, so that the grinding pressure approaches the grinding pressure in the grinding port standard value.

[0019] According to the specific embodiments provided by the present invention, the following technical effects are disclosed: The on-line grinding monitoring system and method for a flour mill provided by the present invention has a relatively low cost, and can stably detect the grinding stability of the flour mill. It can be used by flour milling engineers with slightly poor technical levels, and has high applicability; the system can detect the grinding pressure in real time through a pressure sensor, record and process it, so as to judge whether the gap between the grinding rolls is stable. The pressure sensors are arranged on both sides of the grinding rolls. According to the data of the pressure sensors, the roll gap between the grinding rolls can be adjusted to make the roll gaps on both sides of the grinding rolls basically the same; the system is provided with two roll gap adjustment mechanisms, namely a manual roll gap adjustment handwheel and an automatic adjustment servo motor, which can adjust the roll gap manually or automatically; the method uses this system to realize the detection of the grinding stability of the flour mill, including conducting test grinding on wheat with different varieties and different wheat moisture contents, obtaining the wheat variety and wheat moisture content information. The flour milling engineer adjusts the roll gap between the grinding rolls of the grinding unit according to the wheat variety and wheat moisture content information to meet the ideal requirements. The host computer controller obtains the corresponding grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller through the pressure sensor, the temperature sensor and the feeding proximity switch, takes the wheat variety, the wheat moisture content information and the corresponding grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller as the grinding port standard value and records it, adjusts the flour mill body according to the grinding port standard value, processes and mills the flour, obtains the grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller in real time, and records and stores them at equal time intervals. The host computer controller analyzes the grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller to judge whether a fault occurs. If a fault occurs, the alarm device alarms and displays the analysis result on the display screen for the flour milling engineer to view. The flour milling engineer manually adjusts the roll gap between the grinding rolls according to the analysis result, or sets a threshold for the system, so that after the system judges the allowable offset value of the grinding roll gap, the system automatically controls the servo motor to automatically adjust, so that the grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller meet the grinding port standard value. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Schematic structural diagram of the on-line grinding monitoring system of the flour mill in the embodiment of the present invention;

[0022] Figure 2 Schematic structural diagram of the feeding unit;

[0023] Figure 3 Schematic structural diagram of the grinding unit;

[0024] Figure 4 Flow block diagram of the on-line grinding detection method of the flour mill in the embodiment of the present invention.

[0025] Reference numerals: 1, feeding unit; 2, grinding unit; 201, grinding roller; 3, pressure sensor; 4, roll gap adjusting mechanism; 5, temperature sensor; 6, feeding proximity switch. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] The object of the present invention is to provide an on-line grinding monitoring system and method for a flour mill, which can realize the judgment of whether the grinding state of the flour mill is stable, can adjust the roll gap of the flour mill manually or automatically, can ensure that the roll gaps on both sides of the flour mill are basically the same, and reduces the dependence on the experience of flour milling engineers for roll gap adjustment of the flour mill.

[0028] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0029] As Figures 1-3As shown in the figure, the on-line grinding monitoring system provided by the embodiment of the present invention includes a grinding machine body, a host computer controller, a temperature sensor 5, a feeding proximity switch 6, a roll gap adjusting mechanism 4 and a pressure sensor 3. The grinding machine body includes a grinding unit 2 and a feeding unit 1. The feeding unit 1 is arranged directly above the grinding unit 2 and is used to evenly feed materials into the grinding unit 2. The feeding proximity switch 6 is arranged on the feeding roller of the feeding unit 1 and is used to obtain the rotation frequency of the feeding roller in real time. The temperature sensor 5 is arranged on the bottom bracket of the grinding unit 2 and is used to obtain the temperature of the ground materials in real time. The pressure sensor 3 is arranged on the grinding roller 201 of the grinding unit 2 and is used to obtain the grinding pressure on the grinding roller 201. The roll gap adjusting mechanism 4 is fixedly connected to the front bearing seat of the grinding unit 2 and is used to adjust the roll gap between the grinding rollers 201 of the grinding unit 2. The temperature sensor 5, the feeding proximity switch 6, the roll gap adjusting mechanism 4 and the pressure sensor 3 are all electrically connected to the host computer controller.

[0030] There are two pressure sensors 3, which are respectively arranged on both sides of the grinding roller 201 and are used to obtain the grinding pressures on both sides of the grinding roller 201 in real time.

[0031] The feeding proximity switch 6 is connected to the host computer controller through a frequency signal processing module, and the pressure sensor 3 is connected to the host computer controller through an analog quantity transmitter.

[0032] The system further includes a display, which is electrically connected to the host computer controller and is used to display the information obtained by the host computer controller.

[0033] The system further includes a server, and the host computer controller stores the obtained information in the server.

[0034] The system further includes an alarm device, which is electrically connected to the host computer controller.

[0035] There are two sets of roll gap adjusting mechanisms 4, which are respectively fixedly connected to the front bearing seats on both sides of the grinding unit 2 and are used to adjust the roll gaps on the left and right sides of the grinding roller 201. The roll gap adjusting mechanism 4 includes a manual roll gap adjusting handwheel and an automatic adjusting servo motor. The manual roll gap adjusting handwheel is used to manually adjust the roll gap, and the automatic adjusting servo motor is electrically connected to the host computer controller and is used to automatically adjust the roll gap.

[0036] The system is powered by a DC power supply. The system can record and process up to 48 groups of data information simultaneously. The real-time recording of data can reach 720 hours per second, and remote network transmission and information storage to the server can be achieved. The system uses DTM software to perform operations such as data acquisition, transfer, analysis, and output on the data recorded by the host computer controller. The system is also equipped with an ambient temperature sensor for detecting the ambient temperature. The system can be used for the stability detection and data acquisition of the grinding unit of the flour mill, and can provide accurate data basis for the roll gap adjustment between the grinding rolls of the flour mill.

[0037] As Figure 1 shown, the pressure sensor 3 can also be set on the transmission mechanism connected to the grinding roll 201 to collect the pressure between the grinding rolls 201.

[0038] The flour mill uses a pair of equal-diameter cylindrical grinding rolls that rotate in opposite directions with different speeds to generate a certain extrusion force and shear force on the wheat evenly entering the grinding area. Since the rotational speeds of the two grinding rolls are different, when the wheat passes through the grinding area, it is subjected to comprehensive actions such as extrusion, shear, and rubbing, causing the wheat to break. The present invention can use the flour mills commonly used in the prior art. The flour mill generally mainly includes a grinding unit and a feeding unit. The grinding unit is the core mechanical structure for wheat crushing and grinding in the flour mill, having functions such as clutch brake, coarse roll gap adjustment, and fine roll gap adjustment. The feeding unit is the feeding mechanism of the flour mill, controlling the flow rate of the material entering the grinding area, making the material evenly distributed on the length of the grinding rolls of the grinding unit, and being interlocked with the clutch operation of the grinding rolls. When there is material, the feeding is closed, and when there is no material, the feeding is opened to reduce the action of the grinding rolls and improve the grinding effect. The above-mentioned grinding pressure refers to the reaction force between the two grinding rolls when the grinding unit of the flour mill extrudes, shears, and rubs the material. The roll gap refers to the minimum distance between the outer circumferential surfaces of the two grinding rolls. When grinding the same material, the smaller the roll gap, the greater the grinding pressure, the higher the material breakage, and the increase in flour extraction rate. Conversely, the smaller the roll gap, the lower the material breakage and the decrease in flour extraction rate.

[0039] As Figure 4 shown, the present invention also provides an on-line grinding detection method for a flour mill, which is applied to the above-mentioned on-line grinding monitoring system of the flour mill, and is characterized by including the following steps:

[0040] Step 1: Conduct experimental grinding on wheat with different varieties and different wheat moisture contents to obtain wheat variety and wheat moisture content information. The flour milling engineer adjusts the roll gap between the grinding rolls of the grinding unit to meet the ideal requirements according to the wheat variety and wheat moisture content information. The host computer controller obtains the corresponding grinding pressure, the temperature of the material after grinding, and the rotation frequency of the feeding roll through the pressure sensor, temperature sensor, and feeding proximity switch, and records the wheat variety, wheat moisture content information, and the corresponding grinding pressure, the temperature of the material after grinding, and the rotation frequency of the feeding roll as the grinding port standard values;

[0041] Step 2: According to the standard value of the grinding mouth, the grinding mill body is adjusted to process and grind the powder. The grinding pressure, the temperature of the material after grinding and the rotation frequency of the feed roller are obtained in real time, and the obtained grinding pressure, the temperature of the material after grinding and the rotation frequency of the feed roller are recorded and stored at equal time intervals. The upper computer controller analyzes the recorded grinding pressure, the temperature of the material after grinding and the rotation frequency of the feed roller to determine whether the grinding rolling distance deviation occurs. If the grinding rolling distance deviation occurs, the alarm device alarms and the analysis results are displayed on the display screen for the milling engineer to view. According to the analysis results, the milling engineer manually adjusts the rolling distance between the grinding rollers, or sets a threshold value for the system so that the system automatically controls the servo motor to automatically adjust after determining the allowable value of the grinding rolling distance deviation, so that the grinding pressure, the temperature of the material after grinding and the rotation frequency of the feed roller meet the standard value of the grinding mouth.

[0042] Different wheat varieties have different qualities, properties, bulk density, hardness and processing performance. my country's national standards divide them into five types: hard white wheat, soft white wheat, hard red wheat, soft red wheat and mixed wheat.

[0043] The moisture content of wheat is the actual moisture content of wheat before it enters the flour mill during wheat processing.

[0044] In step 1, the host computer controller obtains the corresponding grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller through the pressure sensor, the temperature sensor and the feeding proximity switch, specifically:

[0045] The feeding proximity switch identifies the rotation frequency of the feeding roller and transmits the frequency signal to the frequency signal processing module. The frequency signal processing module processes the frequency into an analog current signal and sends it to the host computer controller; the pressure sensor collects the grinding pressure, outputs weak voltage information, and transmits the weak voltage information to the analog transmission. The analog transmission processes and amplifies the voltage signal to transmit the output current signal and sends it to the host computer controller; the temperature sensor detects the temperature of the material after grinding and outputs a resistance signal, and sends it to the host computer controller; after receiving the signal, the host computer controller converts the current value and the resistance value into the corresponding feeding roller rotation frequency, grinding pressure and the temperature of the material after grinding according to the preset relationship.

[0046] In step 2, the host computer controller analyzes the grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller to determine whether a fault occurs. If a fault occurs, the alarm device will alarm and display the analysis results on the display screen for the milling engineer to view. The milling engineer manually adjusts the rolling distance between the grinding rollers based on the analysis results, or sets a threshold for the system so that the system automatically controls the servo motor to automatically adjust after determining that the grinding rolling distance deviates from the allowable value, so that the grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller meet the grinding standard value, specifically:

[0047] The upper computer controller collects the grinding pressure in real time and compares it with the grinding pressure in the grinding port standard value. If the difference between the grinding pressure and the grinding pressure in the grinding port standard value is greater than the preset allowable offset value, the upper computer controller alarms through the alarm device and displays the information on the display screen. The flour milling engineer adjusts the roll gap by manually turning the roll gap adjustment handwheel or automatically controls the servo motor through the upper computer controller to adjust the roll gap, so that the grinding pressure approaches the grinding pressure in the grinding port standard value.

[0048] An embodiment of the present invention is: after the flour mill body operates for a period of time, the grinding unit or its internal components undergo microscopic plastic deformation under the action force of the grinding process. At this time, the grinding pressure changes. When the difference between the grinding press and the grinding pressure in the grinding port standard value is greater than the preset allowable offset value, the upper computer controller controls the alarm device to alarm and displays the information on the display screen for the flour milling engineer to view. The flour milling engineer can adjust the roll gap according to the actual situation. When the roll gap is adjusted to a certain extent, the difference between the grinding press and the grinding pressure in the grinding port standard value is less than the preset allowable offset value, and the alarm device stops alarming. The allowable offset value can also be increased through the upper computer controller according to the actual situation;

[0049] The adjustment of the roll gap can be adjusted by manually turning the handwheel or automatically adjusted by the servo motor through system judgment. The automatic adjustment by the servo motor includes the following steps. When the system recognizes that the difference between the grinding pressure and the grinding pressure in the grinding port standard value is greater than the preset allowable offset value, it performs secondary recognition to determine that the difference between the grinding press and the grinding pressure in the grinding port standard value is greater than the preset allowable offset value, calculates the roll gap adjustment data according to the relationship between the grinding pressure and the roll gap, and controls the automatic adjustment servo motor to adjust the roll gap. When the difference between the grinding press and the grinding pressure in the grinding port standard value is less than the preset allowable offset value, the automatic adjustment servo motor is turned off.

[0050] Combined with factors such as the cumulative usage time, pressure at the same roll gap, and main motor current, it is judged that when the wear degree of the grinding roller is too large, it is replaced and reassembled, and the roll gap is adjusted according to the corresponding grinding port standard pressure value recorded by the system for flour milling production;

[0051] When changing the wheat variety or changing the flour variety produced, the roll gap of the flour mill body is adjusted according to the grinding port standard value so that the grinding pressure conforms to the grinding port standard value for flour milling production;

[0052] When the moisture content of wheat or the rotation frequency of the feeding roller changes, and the change is greater than the preset change range, for example, the moisture content of wheat ±2%, the rotation frequency of the feeding roller ±5%, the system calculates the grinding pressure according to the standard value of the grinding port, and calculates the roll gap adjustment data according to the grinding pressure, and adjusts the roll gap manually or automatically to ensure the normal operation of the flour milling process.

[0053] The present invention can use the temperature of the material after grinding and the ambient temperature collected by the temperature sensor to assist in judging the grinding degree of the material.

[0054] The present invention can use DTM software to process and analyze the collected data information, make real-time curves and historical curves of the data, and correspond them to the fault information.

[0055] The online grinding monitoring system and method for a flour mill provided by the present invention has a relatively low cost, and can stably detect the grinding stability of the flour mill. It can be used by flour milling engineers with slightly poor technical levels, and has high applicability; the system can detect the grinding pressure in real time through a pressure sensor, record and process it, so as to judge whether the gap between the grinding rollers is stable. The pressure sensors are arranged on both sides of the grinding rollers. According to the data of the pressure sensors, the roll gap between the grinding rollers can be adjusted to make the roll gaps on both sides of the grinding rollers basically the same; the system is provided with two roll gap adjustment mechanisms, namely a manual roll gap adjustment handwheel and an automatic adjustment servo motor, which can adjust the roll gap manually or automatically; the method uses this system to realize the detection of the grinding stability of the flour mill, including conducting test grinding on wheat with different varieties and different moisture contents of wheat, obtaining the information of wheat varieties and wheat moisture contents, and the flour milling engineer adjusts the roll gap between the grinding rollers of the grinding unit according to the information of wheat varieties and wheat moisture contents to meet the ideal requirements. The upper computer controller obtains the corresponding grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller through the pressure sensor, the temperature sensor and the feeding proximity switch, takes the wheat variety, the wheat moisture content information and the corresponding grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller as the standard value of the grinding port and records them, adjusts the flour mill body according to the standard value of the grinding port, conducts processing and flour milling, obtains the grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller in real time, and records and stores them at equal time intervals. The upper computer controller analyzes the grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller to judge whether there is a deviation in the grinding roll gap. If there is a deviation in the grinding roll gap, the alarm device will give an alarm, and the analysis result will be displayed on the display screen for the flour milling engineer to view. The flour milling engineer manually adjusts the roll gap between the grinding rollers according to the analysis result, or sets a threshold for the system, so that after the system judges the allowable value of the grinding roll gap deviation, the system automatically controls the servo motor to adjust automatically, so that the grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller meet the standard value of the grinding port.

[0056] In this text, specific examples are used to illustrate the principles and implementation modes of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation modes and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An on-line grinding monitoring method for a grinding mill, which is applied to an on-line grinding monitoring system for a grinding mill, and is characterized in that, The on-line grinding monitoring system of the flour mill includes the flour mill body, and also includes: a host computer controller, a temperature sensor, a feeding proximity switch, a roll gap adjusting mechanism and a pressure sensor. The flour mill body includes a grinding unit and a feeding unit. The feeding unit is arranged directly above the grinding unit and is used to evenly feed materials into the grinding unit. The feeding proximity switch is arranged on the feeding roller of the feeding unit and is used to obtain the rotation frequency of the feeding roller in real time. The temperature sensor is arranged on the bottom bracket of the grinding unit and is used to obtain the temperature of the ground materials in real time. The pressure sensor is arranged on the grinding roller of the grinding unit and is used to obtain the grinding pressure on the grinding roller. The roll gap adjusting mechanism is fixedly connected to the front bearing seat of the grinding unit and is used to adjust the roll gap between the grinding rollers of the grinding unit. The temperature sensor, the feeding proximity switch, the roll gap adjusting mechanism and the pressure sensor are all electrically connected to the host computer controller; The on-line grinding monitoring method of the flour mill includes the following steps: Step 1: Conduct test grinding on wheat with different varieties and different moisture contents, obtain the wheat variety and wheat moisture content information. The flour milling engineer adjusts the roll gap between the grinding rollers of the grinding unit according to the wheat variety and wheat moisture content information to meet the ideal requirements. The host computer controller obtains the corresponding grinding pressure, the temperature of the ground materials after grinding and the rotation frequency of the feeding roller through the pressure sensor, the temperature sensor and the feeding proximity switch, and takes the wheat variety, wheat moisture content information and the corresponding grinding pressure, the temperature of the ground materials after grinding and the rotation frequency of the feeding roller as the grinding port standard values and records them; Step 2: Adjust the flour mill body according to the grinding port standard values, carry out flour processing, obtain the grinding pressure, the temperature of the ground materials after grinding and the rotation frequency of the feeding roller in real time, and record and store the obtained grinding pressure, the temperature of the ground materials after grinding and the rotation frequency of the feeding roller at equal time intervals. The host computer controller analyzes the recorded grinding pressure, the temperature of the ground materials after grinding and the rotation frequency of the feeding roller to judge whether there is a deviation in the grinding roll gap. If there is a deviation in the grinding roll gap, the alarm device will give an alarm, and the analysis result will be displayed on the display screen for the flour milling engineer to view. The flour milling engineer manually adjusts the roll gap between the grinding rollers according to the analysis result, or sets a threshold value for the system, so that after the system judges the allowable deviation value of the grinding roll gap, the system automatically controls the servo motor to automatically adjust, so that the grinding pressure, the temperature of the ground materials after grinding and the rotation frequency of the feeding roller meet the grinding port standard values; specifically: The host computer controller collects the grinding pressure in real time and compares it with the grinding pressure in the grinding port standard value. If the difference between the grinding pressure and the grinding pressure in the grinding port standard value is greater than the preset allowable deviation value, the host computer controller gives an alarm through the alarm device and displays the information on the display screen. The flour milling engineer adjusts the roll gap by manually turning the roll gap adjusting handwheel or automatically controlling the servo motor through the host computer controller to make the grinding pressure close to the grinding pressure in the grinding port standard value.

2. The on-line grinding monitoring method of a grinding mill according to claim 1, characterized in that, The pressure sensors are provided with two, which are respectively provided on both sides of the grinding roller, and are used for obtaining the grinding pressure on both sides of the grinding roller in real time.

3. The on-line grinding monitoring method of the grinding mill according to claim 2, characterized in that, The feeding proximity switch is connected to the host computer controller via a frequency signal processing module, and the pressure sensor is connected to the host computer controller via an analog quantity transmitter.

4. The online grinding monitoring method of the grinding mill according to claim 1, wherein, The system further comprises a display, which is electrically connected to the host computer controller and is used for displaying information acquired by the host computer controller.

5. The online grinding monitoring method of the grinding mill according to claim 1, wherein The system also includes a server, and the host computer controller stores the acquired information in the server.

6. The on-line grinding monitoring system for a grinding mill according to claim 1, wherein, The system further comprises an alarm device, which is electrically connected to the host computer controller.

7. The on-line grinding monitoring method of the grinding mill according to claim 1, characterized in that The rolling gap adjustment mechanism is provided with two groups, which are respectively fixedly connected to the front bearing seats on both sides of the grinding unit, and are used to adjust the rolling gap on the left and right sides of the grinding roller. The rolling gap adjustment mechanism includes a manual rolling gap adjustment handwheel and an automatic adjustment servo motor. The manual rolling gap adjustment handwheel is used to manually adjust the rolling gap, and the automatic adjustment servo motor is electrically connected to the upper computer controller for automatically adjusting the rolling gap.

8. The on-line grinding monitoring method of the grinding machine according to claim 1, characterized in that In step 1, the host computer controller obtains the corresponding grinding pressure, the temperature of the material after grinding and the rotation frequency of the feeding roller through the pressure sensor, the temperature sensor and the feeding proximity switch, specifically: The feeding proximity switch identifies the rotation frequency of the feeding roller and transmits the frequency signal to the frequency signal processing module. The frequency signal processing module processes the frequency signal into an analog current signal and sends it to the host computer controller; the pressure sensor collects the grinding pressure, outputs weak voltage information, and transmits the weak voltage information to the analog transmission. The analog transmission processes and amplifies the voltage signal to transmit the output current signal and sends it to the host computer controller; the temperature sensor detects the temperature of the material after grinding and outputs a resistance signal, and sends it to the host computer controller; after receiving the signal, the host computer controller converts the current value and the resistance value into the corresponding feeding roller rotation frequency, grinding pressure and the temperature of the material after grinding according to the preset relationship.

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