Agitator
By using distance sensors and proximity switches in the mixing equipment to automatically detect liner wear, the problems of low detection efficiency and safety hazards in the existing technology are solved, and efficient and safe liner wear monitoring is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HUNAN ZOOMLION NEO MATERIAL TECH CO LTD
- Filing Date
- 2023-10-09
- Publication Date
- 2026-07-14
AI Technical Summary
Existing methods for detecting wear on the inner lining of mixing equipment are inefficient and pose safety hazards. Conventional detection methods require workers to crawl into harsh environments to conduct visual inspections or use handheld equipment.
Multiple distance sensors are arranged at intervals along the axial direction of the stirring shaft. Combined with proximity switches and controllers, the radial distance between the inner liner plate and the stirring shaft is automatically detected. The degree of wear is determined by comparing the difference in the radial distance measurements.
It enables automatic detection of the inner lining plates of mixing equipment, improving detection efficiency, reducing manual intervention, and lowering safety risks.
Smart Images
Figure CN117358126B_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of mixing equipment technology. Background Technology
[0002] Mixing equipment is a common piece of equipment in the production process, often used for mixing homogeneous materials and different materials. In mixing equipment used for dry mixing and dry powder materials, it is common for the mixer to be scrapped due to excessive wear on the inner wall of the mixing cylinder.
[0003] To reduce wear on the inner wall of the mixing equipment's cylinder, an inner lining plate is often added to prevent wear. The lining plate is generally composed of several small pieces, fastened to the inner wall of the mixing cylinder with fasteners. During maintenance, any one of these small pieces can be individually removed and replaced based on the wear pattern observed during mixing. Currently, wear detection of the lining plate typically requires workers to crawl inside the mixing cylinder to visually inspect for wear through, or to use handheld equipment to check the thickness of each lining plate individually. However, the environment inside the mixing cylinder is harsh, making this inspection and maintenance method inefficient and posing significant risks to worker safety and health. Summary of the Invention
[0004] The purpose of this application is to provide a mixing device to achieve automatic detection of the inner lining plate of the mixing device, thereby improving the detection efficiency and reducing human intervention.
[0005] To achieve the above objectives, this application provides a mixing device, including a mixing drum, a mixing shaft, and an inner lining plate arranged on the inner wall of the mixing drum; the mixing device further includes:
[0006] Multiple distance sensors are arranged at intervals along the axial direction of the stirring shaft and are used to periodically detect the radial distance between the sensor and the inner liner.
[0007] The proximity switch includes a first proximity switch element and a second proximity switch element, wherein one of the first proximity switch element and the second proximity switch element is movably mounted on the outer peripheral wall of the stirring shaft, and the other is radially spaced and fixedly disposed; and
[0008] The controller is configured as follows:
[0009] Control the stirring shaft to rotate at a stable speed w;
[0010] Within the first preset detection period starting from the first receiving moment when the first proximity switch senses the closest distance signal of the second proximity switch, the distance sensor is controlled to start from the first receiving moment;
[0011] In the first preset detection cycle, a reference set of radial distance measurement values is obtained, which consists of the radial distance measurement values of the probe of the distance sensor at each detection time.
[0012] Within the second preset detection cycle starting from the second receiving moment when the first proximity switch senses the closest distance signal of the second proximity switch, the distance sensor is controlled to start from the second receiving moment;
[0013] In the second preset detection cycle, a set of radial distance measurement values is obtained, which consists of the radial distance measurement values of the probe of the distance sensor at each detection time.
[0014] The difference between the set of radial spacing measurements and the reference set of radial spacing measurements is compared to obtain the set of distance difference values.
[0015] The wear level of the inner lining plate is determined based on the set of distance differences.
[0016] Optionally, the controller is also configured to:
[0017] For each distance sensor, obtain the set of distance differences obtained after two preset detection cycles.
[0018] Optionally, the set of distance differences, used to determine the degree of wear on the inner liner, further includes:
[0019] Each distance difference in the distance difference set is compared with a preset threshold.
[0020] The degree of wear of the inner lining plate is determined based on the difference comparison value.
[0021] Optionally, the controller is also configured to:
[0022] For each distance sensor, determine the pointing direction set S formed by the detection pointing direction of the probe of each distance sensor at each detection time.
[0023] Optionally, in the set of pointing directions S, S j To determine the probe's pointing orientation at time j, satisfying the following:
[0024] S j =S1+w*(j-1)*t
[0025] Wherein, rotational speed w is angular rotational speed, and t is the periodic detection time of the distance sensor.
[0026] Optionally, each distance sensor includes J detection times in any preset detection cycle, and satisfies the formula:
[0027] J = N / (w1*t)
[0028] Where w1 is the rotational speed of the stirring shaft, N is an increasing set of positive integers, and J is the first positive integer obtained by the formula when N starts to increase from 1.
[0029] Optionally, the distance sensor is a TOF sensor.
[0030] Alternatively, the distance sensor can be one of a laser sensor, an infrared sensor, or an ultrasonic sensor.
[0031] Optionally, the mixing equipment includes:
[0032] The user interaction module is used to input the rotational speed w and the periodic detection time t of the distance sensor to the controller, and to display the wear degree of the inner liner plate.
[0033] Optionally, the stirring shaft is a hollow shaft with hollow wiring.
[0034] Through the above technical solution, by using distance sensors arranged axially at intervals on the stirring shaft for periodic detection of the radial distance between the stirring shaft and the inner liner, and by setting a first proximity switch and a second proximity switch, one of which is movably mounted on the outer peripheral wall of the stirring shaft and the other fixed radially at intervals, after the controller controls the stirring shaft to rotate at a uniform speed, a set of radial distance measurement values can be obtained. This set consists of a reference set of radial distance measurement values formed by the radial distance measurements of the distance sensors at each detection moment within a first preset detection cycle, starting from the first reception moment when the first proximity switch senses the closest distance signal from the second proximity switch. A comparison set of radial distance measurement values also exists within a second preset detection cycle, starting from the second reception moment when the first proximity switch senses the closest distance signal from the second proximity switch. By comparing the radial distance measurement value comparison set with the radial distance measurement value reference set, a set of distance difference values that can be used to confirm the wear degree of the inner liner is obtained, ultimately achieving automatic detection of the inner liner, improving detection efficiency, and reducing human intervention.
[0035] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description
[0036] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:
[0037] Figure 1This is a schematic diagram of the structure of a stirring device according to one embodiment of this application;
[0038] Figure 2 This is a schematic cross-sectional view of a stirring shaft according to one embodiment of this application;
[0039] Figure 3 This is a flowchart of a method for detecting wear on the lining plate of a mixing device according to one embodiment of this application;
[0040] Figure 4 This is a schematic diagram illustrating the wear and tear of a user interaction module according to one embodiment of this application.
[0041] Figure 5 This is a flowchart of a method for detecting wear on the lining plate of a mixing device according to another embodiment of this application;
[0042] Figure 6 This is a structural schematic diagram of a stirring shaft positioning method according to another embodiment of this application.
[0043] Explanation of reference numerals in the attached figures
[0044] 1 Inner liner plate 2 First proximity switch
[0045] 3 Second proximity switch 4 Stirring shaft
[0046] 5. Distance sensor 6. Controller
[0047] S_1 Initial angle S1 7 User interaction module Detailed Implementation
[0048] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.
[0049] The mixing equipment according to this application is described below with reference to the accompanying drawings.
[0050] See Figure 1 and Figure 2 The stirring device in this embodiment includes:
[0051] Multiple distance sensors 5 are arranged at intervals along the axial direction of the stirring shaft 4 and are used to periodically detect the radial distance between the sensor and the inner liner plate 1.
[0052] The proximity switch includes a first proximity switch element 2 and a second proximity switch element 3, one of which is movably mounted on the outer peripheral wall of the stirring shaft 4, and the other is fixedly disposed radially at a distance from it; and
[0053] See Figure 3 Controller 6 is configured to perform detection through the following steps:
[0054] Step S11: Control the stirring shaft 4 to rotate at a stable speed w.
[0055] Step S12: Within the first preset detection period starting from the first receiving moment when the first proximity switch 2 senses the closest distance signal of the second proximity switch 3, control the distance sensor 5 to start from the first receiving moment;
[0056] Step S13: In the first preset detection cycle, acquire the radial distance measurement value reference set composed of the radial distance measurement values of the probe of the distance sensor 5 at each detection time.
[0057] Step S14: Within the second preset detection period starting from the second receiving moment when the first proximity switch 2 senses the closest distance signal of the second proximity switch 3, control the distance sensor 5 to start from the second receiving moment;
[0058] Step S15: In the second preset detection cycle, acquire a set of radial distance measurement values comparisons composed of radial distance measurement values of the probe of distance sensor 5 at each detection time.
[0059] Step S16: Compare the radial spacing measurement value comparison set with the radial spacing measurement value reference set to obtain the distance difference value set;
[0060] Step S17: Determine the wear degree of the inner lining plate 1 based on the distance difference set.
[0061] Specifically, see Figure 1 As an example, the distance sensors 5 in the figure are arranged at intervals along the axial direction of the stirring shaft 4. The first proximity switch 2 and the second proximity switch 3 are respectively an infrared receiver and an infrared transmitter. The infrared transmitter is mounted on the outer peripheral wall of the stirring shaft 4, and the infrared receiver is fixed on the stirring drum, located directly above the stirring shaft 4. When the infrared transmitter mounted on the outer peripheral wall of the stirring shaft 4 faces the infrared receiver, the infrared receiver will send an infrared reception signal back to the controller 6. When the preset detection cycle begins, the infrared receiver faces the infrared transmitter, and the angular orientation of the stirring shaft is confirmed. Subsequently, during the preset detection cycle, the radial distance measurement values in the radial distance measurement reference set and the radial distance measurement comparison set are arranged in the order of acquisition time. Since the rotational speed w is constant and the infrared receiver faces the infrared transmitter at the beginning of the preset detection cycle, each element in the distance difference set can correspond to the difference in radial distance measurement values at different times for each detection point on the inner liner 1. The larger the difference, the higher the degree of wear.
[0062] Of course, those skilled in the art will understand that the first proximity switch 2 and the second proximity switch 3 can also be configured as a Hall element and a magnet, respectively; or a through hole can be added to the stirring shaft 4, and infrared receivers, serving as the first proximity switch 2 and infrared emitters, serving as the second proximity switch 3, can be fixed to the stirring drum at both ends of the through hole. Figure 6 As shown; or the first proximity switch 2 and the second proximity switch 3 can be respectively set as a photoresistor and a light source, so that the structure for positioning the rotation state of the stirring shaft 4 should also fall within the protection scope of this application.
[0063] As wear causes the inner liner plate 1 to thin, the distance between the surface of the inner liner plate 1 and the stirring shaft 4 also increases. By installing a distance sensor 5 inside the stirring drum to periodically detect the distance between the surface of the inner liner plate 1 and the stirring shaft 4, the wear condition of the inner liner plate 1 of the stirring equipment can be automatically detected, improving the detection efficiency and reducing human intervention.
[0064] Obviously, those skilled in the art will understand that, in addition to the preset periodic detection, the distance sensor 5 can also increase the detection frequency through manual intervention of the controller.
[0065] In the case of multiple distance sensors 5, the controller 6 can also be configured as follows:
[0066] For each distance sensor 5, obtain the set of distance differences obtained after two preset detection cycles.
[0067] In some operating conditions, such as when only the wear of the inner liner plate at the axial center of the drum needs to be detected, steps S11 to S17 described above can be performed on one or more distance sensors 5 at the axial center. If each distance sensor 5 is periodically detected, the overall wear condition of the inner liner plate inside the mixing drum can be obtained.
[0068] Furthermore, the controller 6 is also configured to calculate the time length of the preset detection cycle, the number of detections by the distance sensor 5, and the number of rotations of the stirring shaft 4.
[0069] Furthermore, based on the distance difference set obtained from the data collected by each distance sensor 5, in step S16, the wear degree of the inner liner 1 is determined according to the distance difference set, which further includes:
[0070] Each distance difference in the distance difference set is compared with a preset threshold.
[0071] The degree of wear of the inner lining plate 1 is determined based on the difference comparison value.
[0072] When the difference comparison value is greater than zero, it indicates that the wear of the inner liner plate 1 has exceeded the preset threshold and needs to be replaced. By collecting data from each distance sensor 5 to obtain a set of distance difference values and performing a difference comparison, a more comprehensive understanding of the wear of the inner liner plate inside the mixing drum can be obtained.
[0073] In addition, controller 6 can also be configured as:
[0074] For each distance sensor 5, determine the pointing direction set S formed by the detection pointing direction of the probe of each distance sensor 5 at each detection time.
[0075] Therefore, the orientation information of each distance sensor 5 can be obtained. After obtaining the set of distance difference values and comparing the differences, the distance sensor corresponding to the larger difference value can be identified, and the orientation of that sensor can be obtained. Thus, the inner liner plate that the sensor is pointing to can be obtained for maintenance and replacement.
[0076] Furthermore, the setting of the direction set S can satisfy:
[0077] S j =S1+w*(j-1)*t
[0078] Among them, S j To determine the probe's pointing orientation at the j-th detection moment, the rotational speed w is the angular rotational speed of the distance sensor 5, t is the periodic detection time of the distance sensor 5, and the pointing orientation is the angular orientation of the probe. When j is 1, S1 is the initial angle between the probe and the first proximity switch 2 in the circumferential direction of the stirring drum. After obtaining the pointing orientation set S, the probe's pointing orientation at the detection moment can be determined based on the detection moment, thereby enabling the positioning of the wear condition of the inner liner 1 in the circumferential direction of the stirring drum.
[0079] Additionally, before step S12, the following may also be included:
[0080] Each distance sensor 5 is configured to have J detection times in any preset detection period, where J satisfies the formula:
[0081] J = N / (w1*t)
[0082] Where w1 is the rotational speed of the stirring shaft 4, N is an incrementing set of positive integers, t is the periodic detection time of the distance sensor 5, and J is the first positive integer obtained by the formula when N increments from 1. For example, if w1*t equals 3, N can take values of 1, 2, 3, ... When N equals 3, 6, 9, ..., the J values obtained by the formula are all positive integers. However, when N equals 3, J only obtains its first positive integer, so the J value is 1.
[0083] The formula is explained as follows: Based on the rotational speed w1 of the stirring shaft 4 and the periodic detection time t of the distance sensor 5, the number of detections per revolution of the distance sensor 5 is obtained, i.e., 1 / (w1*t). Multiplying the number of detections per revolution by the number of revolutions N yields the number of detections J for N revolutions. J must be an integer, meaning that within a complete preset detection cycle, the angular state of the stirring shaft 4 at the start of detection is consistent with its angular state at the end of detection; the shaft rotates a total of N revolutions, detecting J detection points. Of course, those skilled in the art will understand that if the preset detection cycle does not take a minimum value, the value of J can also be an integer multiple of the aforementioned J value.
[0084] In one optional embodiment of the present invention, the distance sensor 5 adopts a TOF sensor with higher detection accuracy, namely a Time of Flight sensor. It generally requires the use of a specific artificial light source or sound source for measurement, that is, the distance between the transmitter and the reflector is calculated by measuring the "flight time" of signals such as ultrasonic waves, microwaves, and light.
[0085] Specifically, see Figure 2 The distance sensor 5 in the figure uses a laser sensor. The laser sensor accurately measures the radial distance using a laser beam. During operation, the laser sensor emits a laser beam towards the inner lining plate 1, the reflected laser beam is received by a photoelectric element, and a timer measures the time from emission to reception of the laser beam to calculate the radial distance measurement. Of course, those skilled in the art will understand that other methods of measuring radial distance using microwave sensors or similar devices should also fall within the scope of this application.
[0086] In one optional embodiment of the present invention, the stirring device may include:
[0087] The user interaction module is used to input the rotational speed w, the periodic detection time t of the distance sensor 5, the initial detection direction S1, and the interval between two preset detection cycles into the controller 6. It also displays the wear degree of the inner liner 1. Through the user interaction module, the mixing equipment can accurately provide the user with the location and number of the severely worn inner liner 1, and the controller 6 can combine the wear degree and time of the inner liner 1 for a visual display through the user interaction module, facilitating user reading and analysis.
[0088] By setting up a user interaction module, it is easier for operators to observe, read, and input data, making the user interface more user-friendly.
[0089] Based on this, step S11 may further include:
[0090] Users input rotational speed w and periodic detection time t of distance sensor 5 into controller 6 through the user interaction module, and set the rotational speed of stirring shaft 4 and the detection frequency of distance sensor 5.
[0091] It is evident that the input parameters must include at least the rotational speed w, detection time t, initial detection orientation S1, and the interval between two preset detection cycles before the stirring drum can be started to perform periodic detection operations.
[0092] Step S17 may further include:
[0093] The user interaction module displays the set of distance differences corresponding to each distance sensor 5.
[0094] See Figure 4 , Figure 4 This compares the wear level of the inner liner plate 1 corresponding to different distance sensors 5 at specific angles with a threshold value. The user interaction module informs the user of the location information and wear status of severely worn inner liner plates 1 that require replacement, through methods such as audible and visual alarms, preset voice alarms, APP push notifications, or SMS alarms.
[0095] See Figure 2 In this embodiment, the stirring shaft 4 is a hollow shaft with hollow wiring. The wiring in the hollow shaft is used to electrically connect the distance sensor 5, the infrared transmitter, and the controller 6.
[0096] For specific instructions, please refer to [link / reference]. Figure 5 The process is illustrated as an example below:
[0097] 1) The operator inputs the rotation speed of the stirring shaft 4 and the detection frequency of the distance sensor 5 through the user interaction module to set the initial parameters, including at least the rotation speed w of the stirring shaft 4, the periodic detection time of the distance sensor 5, the initial detection direction S1, and the interval between two preset detection cycles.
[0098] 2) According to the operator's input information, the controller 6 sets the rotational speed w of the stirring shaft 4 and the periodic detection time t of the distance sensor 5. Subsequently, the controller 6 sets the number of detections J in the preset detection cycle based on the rotational speed w, the periodic detection time t, and J = N / (w1*t), and obtains the time length of the preset detection cycle from the number of detections J and the periodic detection time t. The time length of the preset detection cycle is T = J*t.
[0099] 3) After the controller 6 detects that the rotational speed w of the stirring shaft 4 has stabilized through the infrared transmitter and infrared receiver, the distance sensor 5 is activated from the first receiving moment within the first preset detection cycle starting from the first receiving moment when the infrared receiver receives the closest distance signal from the infrared transmitter.
[0100] 4) In the first preset detection cycle, the controller 6 saves the radial spacing measurement values obtained by each probe in the order of detection time as a reference set of radial spacing measurement values.
[0101] 5) After the interval between two preset detection cycles, when the controller 6 detects that the rotation speed w of the stirring shaft 4 is stable through the infrared transmitter and infrared receiver, within the second preset detection cycle starting from the second receiving moment when the infrared receiver receives the closest distance signal from the infrared transmitter, the controller 6 controls the distance sensor 5 to start from the second receiving moment.
[0102] 6) In the second preset detection cycle, the controller 6 saves the radial distance measurement values obtained by each probe in the order of detection time as a comparison set of radial distance measurement values.
[0103] 7) The controller 6 obtains the set of distance differences obtained after two preset detection cycles for each distance sensor 5.
[0104] 8) The controller 6 displays the set of distance differences corresponding to each distance sensor 5 through the user interaction module.
[0105] 9) The controller 6 compares each distance difference value from the distance difference set of each distance sensor 5 with a preset threshold. Based on the comparison value, the wear degree of the inner lining plate 1 is determined. If any comparison value is greater than zero, it means that the wear degree of the inner lining plate 1 has exceeded the preset threshold and needs to be replaced.
[0106] 10) The controller 6 determines the axial position of the inner liner 1 that needs to be replaced in the stirring shaft 4 by determining which distance sensor 5's distance difference set the greater than zero difference comparison value comes from.
[0107] 11) After determining that the difference comparison value greater than zero is the j-th element in the distance difference value set of the distance sensor 5, the controller 6 can then obtain the j-th detection time of the distance sensor 5 corresponding to the difference comparison value. Subsequently, the controller 6 uses the detection pointing orientation S1 and S2 of the distance sensor 5 probe in the initial setting... j =S1+w*(j-1)*t, thus obtaining the detection direction S of the probe of the distance sensor 5 at the j-th detection time. j Finally, the position of the severely worn inner liner 1 that needed to be replaced in the circumferential direction of the mixing drum was determined.
[0108] 12) The controller 6 will inform the user of the location information and wear status of the inner lining plate 1 that is severely worn and needs to be replaced through the user interaction module. The notification method may include sound and light alarm, preset voice alarm, APP push or SMS alarm, etc.
[0109] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0110] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0111] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0112] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A mixing device, comprising a mixing drum, a mixing shaft (4), and an inner lining plate (1) arranged on the inner wall of the mixing drum, characterized in that, The mixing device also includes: Multiple distance sensors (5) are arranged at axial intervals along the stirring shaft (4) and used to periodically detect the radial distance between the sensor and the inner liner (1). A proximity switch, comprising: a first proximity switch element (2) and a second proximity switch element (3), wherein one of the first proximity switch element (2) and the second proximity switch element (3) is movably mounted on the outer peripheral wall of the stirring shaft (4), and the other is fixedly disposed radially at a distance; and The controller (6) is configured as follows: Control the stirring shaft (4) to a stable rotation speed. Rotate; Within the first preset detection period starting from the first receiving moment when the first proximity switch (2) senses the closest distance signal of the second proximity switch (3), the distance sensor (5) is controlled to start from the first receiving moment; In the first preset detection cycle, a radial distance measurement reference set is obtained, which consists of the radial distance measurement values of the probe of the distance sensor (5) at each detection time. Within the second preset detection cycle starting from the second receiving moment when the first proximity switch (2) senses the closest distance signal of the second proximity switch (3), the distance sensor (5) is controlled to start from the second receiving moment; In the second preset detection cycle, a radial distance measurement value comparison set is obtained, which is composed of the radial distance measurement values of the probe of the distance sensor (5) at each detection time; The radial spacing measurement comparison set is compared with the radial spacing measurement reference set to obtain a distance difference set. The wear degree of the inner lining plate (1) is determined based on the set of distance differences.
2. The mixing device according to claim 1, characterized in that, The controller (6) is also configured to: For each of the distance sensors (5), the set of distance differences obtained after two preset detection cycles is obtained.
3. The mixing device according to claim 2, characterized in that, Based on the set of distance differences, the degree of wear of the inner lining plate (1) is determined, further including: Each distance difference in the set of distance differences is compared with a preset threshold. The wear degree of the inner lining plate (1) is determined based on the difference comparison value.
4. The mixing device according to claim 1, characterized in that, The controller (6) is also configured to: For each of the distance sensors (5), determine the pointing direction set S formed by the detection pointing direction of the probe of each distance sensor (5) at each detection time.
5. The mixing device according to claim 4, characterized in that, In the set of pointing directions S, For the detection orientation of the probe at the j-th detection time, the following condition must be met: Wherein, the rotational speed t is the angular rotational speed, and t is the periodic detection time of the distance sensor (5).
6. The mixing device according to any one of claims 1 to 5, characterized in that, Each of the distance sensors (5) includes J detection times in any of the preset detection cycles, and satisfies the formula: in, The rotational speed of the stirring shaft (4) is given by N, which is an increasing set of positive integers, and J is the first positive integer obtained by the formula when N starts to increase from 1.
7. The mixing device according to claim 6, characterized in that, The distance sensor (5) is a TOF sensor.
8. The mixing device according to claim 1, characterized in that, The stirring device includes: The user interaction module is used to input the rotational speed to the controller (6). The periodic detection time t of the distance sensor (5) is used to indicate the wear degree of the inner lining plate (1).
9. The mixing device according to claim 1, characterized in that, The stirring shaft (4) is a hollow shaft with hollow wiring.